// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {TransparentUpgradeableProxy} from "@openzeppelin/contracts/proxy/transparent/TransparentUpgradeableProxy.sol";
import "../helpers/Errors.sol";
contract BendUpgradeableProxy is TransparentUpgradeableProxy {
  constructor(
    address _logic,
    address admin_,
    bytes memory _data
  ) payable TransparentUpgradeableProxy(_logic, admin_, _data) {}
  modifier OnlyAdmin() {
    require(msg.sender == _getAdmin(), Errors.CALLER_NOT_POOL_ADMIN);
    _;
  }
  function getImplementation() external view OnlyAdmin returns (address) {
    return _getImplementation();
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/transparent/TransparentUpgradeableProxy.sol)
pragma solidity ^0.8.0;
import "../ERC1967/ERC1967Proxy.sol";
/**
 * @dev This contract implements a proxy that is upgradeable by an admin.
 *
 * To avoid https://medium.com/nomic-labs-blog/malicious-backdoors-in-ethereum-proxies-62629adf3357[proxy selector
 * clashing], which can potentially be used in an attack, this contract uses the
 * https://blog.openzeppelin.com/the-transparent-proxy-pattern/[transparent proxy pattern]. This pattern implies two
 * things that go hand in hand:
 *
 * 1. If any account other than the admin calls the proxy, the call will be forwarded to the implementation, even if
 * that call matches one of the admin functions exposed by the proxy itself.
 * 2. If the admin calls the proxy, it can access the admin functions, but its calls will never be forwarded to the
 * implementation. If the admin tries to call a function on the implementation it will fail with an error that says
 * "admin cannot fallback to proxy target".
 *
 * These properties mean that the admin account can only be used for admin actions like upgrading the proxy or changing
 * the admin, so it's best if it's a dedicated account that is not used for anything else. This will avoid headaches due
 * to sudden errors when trying to call a function from the proxy implementation.
 *
 * Our recommendation is for the dedicated account to be an instance of the {ProxyAdmin} contract. If set up this way,
 * you should think of the `ProxyAdmin` instance as the real administrative interface of your proxy.
 */
contract TransparentUpgradeableProxy is ERC1967Proxy {
    /**
     * @dev Initializes an upgradeable proxy managed by `_admin`, backed by the implementation at `_logic`, and
     * optionally initialized with `_data` as explained in {ERC1967Proxy-constructor}.
     */
    constructor(
        address _logic,
        address admin_,
        bytes memory _data
    ) payable ERC1967Proxy(_logic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        _changeAdmin(admin_);
    }
    /**
     * @dev Modifier used internally that will delegate the call to the implementation unless the sender is the admin.
     */
    modifier ifAdmin() {
        if (msg.sender == _getAdmin()) {
            _;
        } else {
            _fallback();
        }
    }
    /**
     * @dev Returns the current admin.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyAdmin}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function admin() external ifAdmin returns (address admin_) {
        admin_ = _getAdmin();
    }
    /**
     * @dev Returns the current implementation.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyImplementation}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc`
     */
    function implementation() external ifAdmin returns (address implementation_) {
        implementation_ = _implementation();
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-changeProxyAdmin}.
     */
    function changeAdmin(address newAdmin) external virtual ifAdmin {
        _changeAdmin(newAdmin);
    }
    /**
     * @dev Upgrade the implementation of the proxy.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgrade}.
     */
    function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeToAndCall(newImplementation, bytes(""), false);
    }
    /**
     * @dev Upgrade the implementation of the proxy, and then call a function from the new implementation as specified
     * by `data`, which should be an encoded function call. This is useful to initialize new storage variables in the
     * proxied contract.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgradeAndCall}.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable ifAdmin {
        _upgradeToAndCall(newImplementation, data, true);
    }
    /**
     * @dev Returns the current admin.
     */
    function _admin() internal view virtual returns (address) {
        return _getAdmin();
    }
    /**
     * @dev Makes sure the admin cannot access the fallback function. See {Proxy-_beforeFallback}.
     */
    function _beforeFallback() internal virtual override {
        require(msg.sender != _getAdmin(), "TransparentUpgradeableProxy: admin cannot fallback to proxy target");
        super._beforeFallback();
    }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title Errors library
 * @author Bend
 * @notice Defines the error messages emitted by the different contracts of the Bend protocol
 */
library Errors {
  enum ReturnCode {
    SUCCESS,
    FAILED
  }
  string public constant SUCCESS = "0";
  //common errors
  string public constant CALLER_NOT_POOL_ADMIN = "100"; // 'The caller must be the pool admin'
  string public constant CALLER_NOT_ADDRESS_PROVIDER = "101";
  string public constant INVALID_FROM_BALANCE_AFTER_TRANSFER = "102";
  string public constant INVALID_TO_BALANCE_AFTER_TRANSFER = "103";
  //math library erros
  string public constant MATH_MULTIPLICATION_OVERFLOW = "200";
  string public constant MATH_ADDITION_OVERFLOW = "201";
  string public constant MATH_DIVISION_BY_ZERO = "202";
  //validation & check errors
  string public constant VL_INVALID_AMOUNT = "301"; // 'Amount must be greater than 0'
  string public constant VL_NO_ACTIVE_RESERVE = "302"; // 'Action requires an active reserve'
  string public constant VL_RESERVE_FROZEN = "303"; // 'Action cannot be performed because the reserve is frozen'
  string public constant VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE = "304"; // 'User cannot withdraw more than the available balance'
  string public constant VL_BORROWING_NOT_ENABLED = "305"; // 'Borrowing is not enabled'
  string public constant VL_COLLATERAL_BALANCE_IS_0 = "306"; // 'The collateral balance is 0'
  string public constant VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD = "307"; // 'Health factor is lesser than the liquidation threshold'
  string public constant VL_COLLATERAL_CANNOT_COVER_NEW_BORROW = "308"; // 'There is not enough collateral to cover a new borrow'
  string public constant VL_NO_DEBT_OF_SELECTED_TYPE = "309"; // 'for repayment of stable debt, the user needs to have stable debt, otherwise, he needs to have variable debt'
  string public constant VL_NO_ACTIVE_NFT = "310";
  string public constant VL_NFT_FROZEN = "311";
  string public constant VL_SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER = "312"; // 'User did not borrow the specified currency'
  string public constant VL_INVALID_HEALTH_FACTOR = "313";
  string public constant VL_INVALID_ONBEHALFOF_ADDRESS = "314";
  string public constant VL_INVALID_TARGET_ADDRESS = "315";
  string public constant VL_INVALID_RESERVE_ADDRESS = "316";
  string public constant VL_SPECIFIED_LOAN_NOT_BORROWED_BY_USER = "317";
  string public constant VL_SPECIFIED_RESERVE_NOT_BORROWED_BY_USER = "318";
  string public constant VL_HEALTH_FACTOR_HIGHER_THAN_LIQUIDATION_THRESHOLD = "319";
  //lend pool errors
  string public constant LP_CALLER_NOT_LEND_POOL_CONFIGURATOR = "400"; // 'The caller of the function is not the lending pool configurator'
  string public constant LP_IS_PAUSED = "401"; // 'Pool is paused'
  string public constant LP_NO_MORE_RESERVES_ALLOWED = "402";
  string public constant LP_NOT_CONTRACT = "403";
  string public constant LP_BORROW_NOT_EXCEED_LIQUIDATION_THRESHOLD = "404";
  string public constant LP_BORROW_IS_EXCEED_LIQUIDATION_PRICE = "405";
  string public constant LP_NO_MORE_NFTS_ALLOWED = "406";
  string public constant LP_INVALIED_USER_NFT_AMOUNT = "407";
  string public constant LP_INCONSISTENT_PARAMS = "408";
  string public constant LP_NFT_IS_NOT_USED_AS_COLLATERAL = "409";
  string public constant LP_CALLER_MUST_BE_AN_BTOKEN = "410";
  string public constant LP_INVALIED_NFT_AMOUNT = "411";
  string public constant LP_NFT_HAS_USED_AS_COLLATERAL = "412";
  string public constant LP_DELEGATE_CALL_FAILED = "413";
  string public constant LP_AMOUNT_LESS_THAN_EXTRA_DEBT = "414";
  string public constant LP_AMOUNT_LESS_THAN_REDEEM_THRESHOLD = "415";
  //lend pool loan errors
  string public constant LPL_INVALID_LOAN_STATE = "480";
  string public constant LPL_INVALID_LOAN_AMOUNT = "481";
  string public constant LPL_INVALID_TAKEN_AMOUNT = "482";
  string public constant LPL_AMOUNT_OVERFLOW = "483";
  string public constant LPL_BID_PRICE_LESS_THAN_LIQUIDATION_PRICE = "484";
  string public constant LPL_BID_PRICE_LESS_THAN_HIGHEST_PRICE = "485";
  string public constant LPL_BID_REDEEM_DURATION_HAS_END = "486";
  string public constant LPL_BID_USER_NOT_SAME = "487";
  string public constant LPL_BID_REPAY_AMOUNT_NOT_ENOUGH = "488";
  string public constant LPL_BID_AUCTION_DURATION_HAS_END = "489";
  string public constant LPL_BID_AUCTION_DURATION_NOT_END = "490";
  string public constant LPL_BID_PRICE_LESS_THAN_BORROW = "491";
  string public constant LPL_INVALID_BIDDER_ADDRESS = "492";
  string public constant LPL_AMOUNT_LESS_THAN_BID_FINE = "493";
  //common token errors
  string public constant CT_CALLER_MUST_BE_LEND_POOL = "500"; // 'The caller of this function must be a lending pool'
  string public constant CT_INVALID_MINT_AMOUNT = "501"; //invalid amount to mint
  string public constant CT_INVALID_BURN_AMOUNT = "502"; //invalid amount to burn
  //reserve logic errors
  string public constant RL_RESERVE_ALREADY_INITIALIZED = "601"; // 'Reserve has already been initialized'
  string public constant RL_LIQUIDITY_INDEX_OVERFLOW = "602"; //  Liquidity index overflows uint128
  string public constant RL_VARIABLE_BORROW_INDEX_OVERFLOW = "603"; //  Variable borrow index overflows uint128
  string public constant RL_LIQUIDITY_RATE_OVERFLOW = "604"; //  Liquidity rate overflows uint128
  string public constant RL_VARIABLE_BORROW_RATE_OVERFLOW = "605"; //  Variable borrow rate overflows uint128
  //configure errors
  string public constant LPC_RESERVE_LIQUIDITY_NOT_0 = "700"; // 'The liquidity of the reserve needs to be 0'
  string public constant LPC_INVALID_CONFIGURATION = "701"; // 'Invalid risk parameters for the reserve'
  string public constant LPC_CALLER_NOT_EMERGENCY_ADMIN = "702"; // 'The caller must be the emergency admin'
  string public constant LPC_INVALIED_BNFT_ADDRESS = "703";
  string public constant LPC_INVALIED_LOAN_ADDRESS = "704";
  string public constant LPC_NFT_LIQUIDITY_NOT_0 = "705";
  //reserve config errors
  string public constant RC_INVALID_LTV = "730";
  string public constant RC_INVALID_LIQ_THRESHOLD = "731";
  string public constant RC_INVALID_LIQ_BONUS = "732";
  string public constant RC_INVALID_DECIMALS = "733";
  string public constant RC_INVALID_RESERVE_FACTOR = "734";
  string public constant RC_INVALID_REDEEM_DURATION = "735";
  string public constant RC_INVALID_AUCTION_DURATION = "736";
  string public constant RC_INVALID_REDEEM_FINE = "737";
  string public constant RC_INVALID_REDEEM_THRESHOLD = "738";
  //address provider erros
  string public constant LPAPR_PROVIDER_NOT_REGISTERED = "760"; // 'Provider is not registered'
  string public constant LPAPR_INVALID_ADDRESSES_PROVIDER_ID = "761";
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/ERC1967/ERC1967Proxy.sol)
pragma solidity ^0.8.0;
import "../Proxy.sol";
import "./ERC1967Upgrade.sol";
/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 */
contract ERC1967Proxy is Proxy, ERC1967Upgrade {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     *
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _upgradeToAndCall(_logic, _data, false);
    }
    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal view virtual override returns (address impl) {
        return ERC1967Upgrade._getImplementation();
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/Proxy.sol)
pragma solidity ^0.8.0;
/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())
            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())
            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }
    /**
     * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);
    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback() external payable virtual {
        _fallback();
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive() external payable virtual {
        _fallback();
    }
    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/ERC1967/ERC1967Upgrade.sol)
pragma solidity ^0.8.2;
import "../beacon/IBeacon.sol";
import "../../utils/Address.sol";
import "../../utils/StorageSlot.sol";
/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 *
 * @custom:oz-upgrades-unsafe-allow delegatecall
 */
abstract contract ERC1967Upgrade {
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);
    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }
    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }
    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
    }
    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallSecure(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        address oldImplementation = _getImplementation();
        // Initial upgrade and setup call
        _setImplementation(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
        // Perform rollback test if not already in progress
        StorageSlot.BooleanSlot storage rollbackTesting = StorageSlot.getBooleanSlot(_ROLLBACK_SLOT);
        if (!rollbackTesting.value) {
            // Trigger rollback using upgradeTo from the new implementation
            rollbackTesting.value = true;
            Address.functionDelegateCall(
                newImplementation,
                abi.encodeWithSignature("upgradeTo(address)", oldImplementation)
            );
            rollbackTesting.value = false;
            // Check rollback was effective
            require(oldImplementation == _getImplementation(), "ERC1967Upgrade: upgrade breaks further upgrades");
            // Finally reset to the new implementation and log the upgrade
            _upgradeTo(newImplementation);
        }
    }
    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);
    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlot.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }
    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;
    /**
     * @dev Emitted when the beacon is upgraded.
     */
    event BeaconUpgraded(address indexed beacon);
    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(_BEACON_SLOT).value;
    }
    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(Address.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            Address.isContract(IBeacon(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlot.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }
    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(
        address newBeacon,
        bytes memory data,
        bool forceCall
    ) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)
pragma solidity ^0.8.0;
/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)
pragma solidity ^0.8.0;
/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/StorageSlot.sol)
pragma solidity ^0.8.0;
/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }
    struct BooleanSlot {
        bool value;
    }
    struct Bytes32Slot {
        bytes32 value;
    }
    struct Uint256Slot {
        uint256 value;
    }
    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import {IERC721Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
import {ERC721HolderUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/utils/ERC721HolderUpgradeable.sol";
import {Errors} from "../libraries/helpers/Errors.sol";
import {ILendPool} from "../interfaces/ILendPool.sol";
import {ILendPoolLoan} from "../interfaces/ILendPoolLoan.sol";
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
import {IPunks} from "../interfaces/IPunks.sol";
import {IWrappedPunks} from "../interfaces/IWrappedPunks.sol";
import {IPunkGateway} from "../interfaces/IPunkGateway.sol";
import {DataTypes} from "../libraries/types/DataTypes.sol";
import {IWETHGateway} from "../interfaces/IWETHGateway.sol";
import {EmergencyTokenRecoveryUpgradeable} from "./EmergencyTokenRecoveryUpgradeable.sol";
contract PunkGateway is IPunkGateway, ERC721HolderUpgradeable, EmergencyTokenRecoveryUpgradeable {
  using SafeERC20Upgradeable for IERC20Upgradeable;
  ILendPoolAddressesProvider internal _addressProvider;
  IWETHGateway internal _wethGateway;
  IPunks public punks;
  IWrappedPunks public wrappedPunks;
  address public proxy;
  mapping(address => bool) internal _callerWhitelists;
  uint256 private constant _NOT_ENTERED = 0;
  uint256 private constant _ENTERED = 1;
  uint256 private _status;
  /**
   * @dev Prevents a contract from calling itself, directly or indirectly.
   * Calling a `nonReentrant` function from another `nonReentrant`
   * function is not supported. It is possible to prevent this from happening
   * by making the `nonReentrant` function external, and making it call a
   * `private` function that does the actual work.
   */
  modifier nonReentrant() {
    // On the first call to nonReentrant, _notEntered will be true
    require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
    // Any calls to nonReentrant after this point will fail
    _status = _ENTERED;
    _;
    // By storing the original value once again, a refund is triggered (see
    // https://eips.ethereum.org/EIPS/eip-2200)
    _status = _NOT_ENTERED;
  }
  function initialize(
    address addressProvider,
    address wethGateway,
    address _punks,
    address _wrappedPunks
  ) public initializer {
    __ERC721Holder_init();
    __EmergencyTokenRecovery_init();
    _addressProvider = ILendPoolAddressesProvider(addressProvider);
    _wethGateway = IWETHGateway(wethGateway);
    punks = IPunks(_punks);
    wrappedPunks = IWrappedPunks(_wrappedPunks);
    wrappedPunks.registerProxy();
    proxy = wrappedPunks.proxyInfo(address(this));
    IERC721Upgradeable(address(wrappedPunks)).setApprovalForAll(address(_getLendPool()), true);
    IERC721Upgradeable(address(wrappedPunks)).setApprovalForAll(address(_wethGateway), true);
  }
  function _getLendPool() internal view returns (ILendPool) {
    return ILendPool(_addressProvider.getLendPool());
  }
  function _getLendPoolLoan() internal view returns (ILendPoolLoan) {
    return ILendPoolLoan(_addressProvider.getLendPoolLoan());
  }
  function authorizeLendPoolERC20(address[] calldata tokens) external nonReentrant onlyOwner {
    for (uint256 i = 0; i < tokens.length; i++) {
      IERC20Upgradeable(tokens[i]).approve(address(_getLendPool()), type(uint256).max);
    }
  }
  function authorizeCallerWhitelist(address[] calldata callers, bool flag) external nonReentrant onlyOwner {
    for (uint256 i = 0; i < callers.length; i++) {
      _callerWhitelists[callers[i]] = flag;
    }
  }
  function isCallerInWhitelist(address caller) external view returns (bool) {
    return _callerWhitelists[caller];
  }
  function _checkValidCallerAndOnBehalfOf(address onBehalfOf) internal view {
    require(
      (onBehalfOf == _msgSender()) || (_callerWhitelists[_msgSender()] == true),
      Errors.CALLER_NOT_ONBEHALFOF_OR_IN_WHITELIST
    );
  }
  function _depositPunk(uint256 punkIndex) internal {
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(address(wrappedPunks), punkIndex);
    if (loanId != 0) {
      return;
    }
    address owner = punks.punkIndexToAddress(punkIndex);
    require(owner == _msgSender(), "PunkGateway: not owner of punkIndex");
    punks.buyPunk(punkIndex);
    punks.transferPunk(proxy, punkIndex);
    wrappedPunks.mint(punkIndex);
  }
  function borrow(
    address reserveAsset,
    uint256 amount,
    uint256 punkIndex,
    address onBehalfOf,
    uint16 referralCode
  ) external override nonReentrant {
    _checkValidCallerAndOnBehalfOf(onBehalfOf);
    ILendPool cachedPool = _getLendPool();
    _depositPunk(punkIndex);
    cachedPool.borrow(reserveAsset, amount, address(wrappedPunks), punkIndex, onBehalfOf, referralCode);
    IERC20Upgradeable(reserveAsset).transfer(onBehalfOf, amount);
  }
  function batchBorrow(
    address[] calldata reserveAssets,
    uint256[] calldata amounts,
    uint256[] calldata punkIndexs,
    address onBehalfOf,
    uint16 referralCode
  ) external override nonReentrant {
    require(punkIndexs.length == reserveAssets.length, "inconsistent reserveAssets length");
    require(punkIndexs.length == amounts.length, "inconsistent amounts length");
    _checkValidCallerAndOnBehalfOf(onBehalfOf);
    ILendPool cachedPool = _getLendPool();
    for (uint256 i = 0; i < punkIndexs.length; i++) {
      _depositPunk(punkIndexs[i]);
      cachedPool.borrow(reserveAssets[i], amounts[i], address(wrappedPunks), punkIndexs[i], onBehalfOf, referralCode);
      IERC20Upgradeable(reserveAssets[i]).transfer(onBehalfOf, amounts[i]);
    }
  }
  function _withdrawPunk(uint256 punkIndex, address onBehalfOf) internal {
    address owner = wrappedPunks.ownerOf(punkIndex);
    require(owner == _msgSender(), "PunkGateway: caller is not owner");
    require(owner == onBehalfOf, "PunkGateway: onBehalfOf is not owner");
    wrappedPunks.safeTransferFrom(onBehalfOf, address(this), punkIndex);
    wrappedPunks.burn(punkIndex);
    punks.transferPunk(onBehalfOf, punkIndex);
  }
  function repay(uint256 punkIndex, uint256 amount) external override nonReentrant returns (uint256, bool) {
    return _repay(punkIndex, amount);
  }
  function batchRepay(uint256[] calldata punkIndexs, uint256[] calldata amounts)
    external
    override
    nonReentrant
    returns (uint256[] memory, bool[] memory)
  {
    require(punkIndexs.length == amounts.length, "inconsistent amounts length");
    uint256[] memory repayAmounts = new uint256[](punkIndexs.length);
    bool[] memory repayAlls = new bool[](punkIndexs.length);
    for (uint256 i = 0; i < punkIndexs.length; i++) {
      (repayAmounts[i], repayAlls[i]) = _repay(punkIndexs[i], amounts[i]);
    }
    return (repayAmounts, repayAlls);
  }
  function _repay(uint256 punkIndex, uint256 amount) internal returns (uint256, bool) {
    ILendPool cachedPool = _getLendPool();
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(address(wrappedPunks), punkIndex);
    require(loanId != 0, "PunkGateway: no loan with such punkIndex");
    (, , address reserve, ) = cachedPoolLoan.getLoanCollateralAndReserve(loanId);
    (, uint256 debt) = cachedPoolLoan.getLoanReserveBorrowAmount(loanId);
    address borrower = cachedPoolLoan.borrowerOf(loanId);
    if (amount > debt) {
      amount = debt;
    }
    IERC20Upgradeable(reserve).transferFrom(msg.sender, address(this), amount);
    (uint256 paybackAmount, bool burn) = cachedPool.repay(address(wrappedPunks), punkIndex, amount);
    if (burn) {
      require(borrower == _msgSender(), "PunkGateway: caller is not borrower");
      _withdrawPunk(punkIndex, borrower);
    }
    return (paybackAmount, burn);
  }
  function auction(
    uint256 punkIndex,
    uint256 bidPrice,
    address onBehalfOf
  ) external override nonReentrant {
    _checkValidCallerAndOnBehalfOf(onBehalfOf);
    ILendPool cachedPool = _getLendPool();
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(address(wrappedPunks), punkIndex);
    require(loanId != 0, "PunkGateway: no loan with such punkIndex");
    (, , address reserve, ) = cachedPoolLoan.getLoanCollateralAndReserve(loanId);
    IERC20Upgradeable(reserve).transferFrom(msg.sender, address(this), bidPrice);
    cachedPool.auction(address(wrappedPunks), punkIndex, bidPrice, onBehalfOf);
  }
  function redeem(
    uint256 punkIndex,
    uint256 amount,
    uint256 bidFine
  ) external override nonReentrant returns (uint256) {
    ILendPool cachedPool = _getLendPool();
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(address(wrappedPunks), punkIndex);
    require(loanId != 0, "PunkGateway: no loan with such punkIndex");
    DataTypes.LoanData memory loan = cachedPoolLoan.getLoan(loanId);
    IERC20Upgradeable(loan.reserveAsset).transferFrom(msg.sender, address(this), (amount + bidFine));
    uint256 paybackAmount = cachedPool.redeem(address(wrappedPunks), punkIndex, amount, bidFine);
    if ((amount + bidFine) > paybackAmount) {
      IERC20Upgradeable(loan.reserveAsset).safeTransfer(msg.sender, ((amount + bidFine) - paybackAmount));
    }
    return paybackAmount;
  }
  function liquidate(uint256 punkIndex, uint256 amount) external override nonReentrant returns (uint256) {
    ILendPool cachedPool = _getLendPool();
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(address(wrappedPunks), punkIndex);
    require(loanId != 0, "PunkGateway: no loan with such punkIndex");
    DataTypes.LoanData memory loan = cachedPoolLoan.getLoan(loanId);
    require(loan.bidderAddress == _msgSender(), "PunkGateway: caller is not bidder");
    if (amount > 0) {
      IERC20Upgradeable(loan.reserveAsset).transferFrom(msg.sender, address(this), amount);
    }
    uint256 extraRetAmount = cachedPool.liquidate(address(wrappedPunks), punkIndex, amount);
    _withdrawPunk(punkIndex, loan.bidderAddress);
    if (amount > extraRetAmount) {
      IERC20Upgradeable(loan.reserveAsset).safeTransfer(msg.sender, (amount - extraRetAmount));
    }
    return (extraRetAmount);
  }
  function borrowETH(
    uint256 amount,
    uint256 punkIndex,
    address onBehalfOf,
    uint16 referralCode
  ) external override nonReentrant {
    _checkValidCallerAndOnBehalfOf(onBehalfOf);
    _depositPunk(punkIndex);
    _wethGateway.borrowETH(amount, address(wrappedPunks), punkIndex, onBehalfOf, referralCode);
  }
  function batchBorrowETH(
    uint256[] calldata amounts,
    uint256[] calldata punkIndexs,
    address onBehalfOf,
    uint16 referralCode
  ) external override nonReentrant {
    require(punkIndexs.length == amounts.length, "inconsistent amounts length");
    _checkValidCallerAndOnBehalfOf(onBehalfOf);
    address[] memory nftAssets = new address[](punkIndexs.length);
    for (uint256 i = 0; i < punkIndexs.length; i++) {
      nftAssets[i] = address(wrappedPunks);
      _depositPunk(punkIndexs[i]);
    }
    _wethGateway.batchBorrowETH(amounts, nftAssets, punkIndexs, onBehalfOf, referralCode);
  }
  function repayETH(uint256 punkIndex, uint256 amount) external payable override nonReentrant returns (uint256, bool) {
    (uint256 paybackAmount, bool burn) = _repayETH(punkIndex, amount, 0);
    // refund remaining dust eth
    if (msg.value > paybackAmount) {
      _safeTransferETH(msg.sender, msg.value - paybackAmount);
    }
    return (paybackAmount, burn);
  }
  function batchRepayETH(uint256[] calldata punkIndexs, uint256[] calldata amounts)
    external
    payable
    override
    nonReentrant
    returns (uint256[] memory, bool[] memory)
  {
    require(punkIndexs.length == amounts.length, "inconsistent amounts length");
    uint256[] memory repayAmounts = new uint256[](punkIndexs.length);
    bool[] memory repayAlls = new bool[](punkIndexs.length);
    uint256 allRepayAmount = 0;
    for (uint256 i = 0; i < punkIndexs.length; i++) {
      (repayAmounts[i], repayAlls[i]) = _repayETH(punkIndexs[i], amounts[i], allRepayAmount);
      allRepayAmount += repayAmounts[i];
    }
    // refund remaining dust eth
    if (msg.value > allRepayAmount) {
      _safeTransferETH(msg.sender, msg.value - allRepayAmount);
    }
    return (repayAmounts, repayAlls);
  }
  function _repayETH(
    uint256 punkIndex,
    uint256 amount,
    uint256 accAmount
  ) internal returns (uint256, bool) {
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(address(wrappedPunks), punkIndex);
    require(loanId != 0, "PunkGateway: no loan with such punkIndex");
    address borrower = cachedPoolLoan.borrowerOf(loanId);
    require(borrower == _msgSender(), "PunkGateway: caller is not borrower");
    (, uint256 repayDebtAmount) = cachedPoolLoan.getLoanReserveBorrowAmount(loanId);
    if (amount < repayDebtAmount) {
      repayDebtAmount = amount;
    }
    require(msg.value >= (accAmount + repayDebtAmount), "msg.value is less than repay amount");
    (uint256 paybackAmount, bool burn) = _wethGateway.repayETH{value: repayDebtAmount}(
      address(wrappedPunks),
      punkIndex,
      amount
    );
    if (burn) {
      _withdrawPunk(punkIndex, borrower);
    }
    return (paybackAmount, burn);
  }
  function auctionETH(uint256 punkIndex, address onBehalfOf) external payable override nonReentrant {
    _checkValidCallerAndOnBehalfOf(onBehalfOf);
    _wethGateway.auctionETH{value: msg.value}(address(wrappedPunks), punkIndex, onBehalfOf);
  }
  function redeemETH(
    uint256 punkIndex,
    uint256 amount,
    uint256 bidFine
  ) external payable override nonReentrant returns (uint256) {
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(address(wrappedPunks), punkIndex);
    require(loanId != 0, "PunkGateway: no loan with such punkIndex");
    //DataTypes.LoanData memory loan = cachedPoolLoan.getLoan(loanId);
    uint256 paybackAmount = _wethGateway.redeemETH{value: msg.value}(address(wrappedPunks), punkIndex, amount, bidFine);
    // refund remaining dust eth
    if (msg.value > paybackAmount) {
      _safeTransferETH(msg.sender, msg.value - paybackAmount);
    }
    return paybackAmount;
  }
  function liquidateETH(uint256 punkIndex) external payable override nonReentrant returns (uint256) {
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(address(wrappedPunks), punkIndex);
    require(loanId != 0, "PunkGateway: no loan with such punkIndex");
    DataTypes.LoanData memory loan = cachedPoolLoan.getLoan(loanId);
    require(loan.bidderAddress == _msgSender(), "PunkGateway: caller is not bidder");
    uint256 extraAmount = _wethGateway.liquidateETH{value: msg.value}(address(wrappedPunks), punkIndex);
    _withdrawPunk(punkIndex, loan.bidderAddress);
    // refund remaining dust eth
    if (msg.value > extraAmount) {
      _safeTransferETH(msg.sender, msg.value - extraAmount);
    }
    return extraAmount;
  }
  /**
   * @dev transfer ETH to an address, revert if it fails.
   * @param to recipient of the transfer
   * @param value the amount to send
   */
  function _safeTransferETH(address to, uint256 value) internal {
    (bool success, ) = to.call{value: value}(new bytes(0));
    require(success, "ETH_TRANSFER_FAILED");
  }
  /**
   * @dev
   */
  receive() external payable {}
  /**
   * @dev Revert fallback calls
   */
  fallback() external payable {
    revert("Fallback not allowed");
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Context_init_unchained();
        __Ownable_init_unchained();
    }
    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
    uint256[49] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165Upgradeable.sol";
/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721Upgradeable is IERC165Upgradeable {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);
    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;
    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);
    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;
    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);
    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.0;
import "../IERC20Upgradeable.sol";
import "../../../utils/AddressUpgradeable.sol";
/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20Upgradeable {
    using AddressUpgradeable for address;
    function safeTransfer(
        IERC20Upgradeable token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }
    function safeTransferFrom(
        IERC20Upgradeable token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }
    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }
    function safeIncreaseAllowance(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    function safeDecreaseAllowance(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }
    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20Upgradeable token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.
        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/utils/ERC721Holder.sol)
pragma solidity ^0.8.0;
import "../IERC721ReceiverUpgradeable.sol";
import "../../../proxy/utils/Initializable.sol";
/**
 * @dev Implementation of the {IERC721Receiver} interface.
 *
 * Accepts all token transfers.
 * Make sure the contract is able to use its token with {IERC721-safeTransferFrom}, {IERC721-approve} or {IERC721-setApprovalForAll}.
 */
contract ERC721HolderUpgradeable is Initializable, IERC721ReceiverUpgradeable {
    function __ERC721Holder_init() internal onlyInitializing {
        __ERC721Holder_init_unchained();
    }
    function __ERC721Holder_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev See {IERC721Receiver-onERC721Received}.
     *
     * Always returns `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address,
        address,
        uint256,
        bytes memory
    ) public virtual override returns (bytes4) {
        return this.onERC721Received.selector;
    }
    uint256[50] private __gap;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title Errors library
 * @author Bend
 * @notice Defines the error messages emitted by the different contracts of the Bend protocol
 */
library Errors {
  enum ReturnCode {
    SUCCESS,
    FAILED
  }
  string public constant SUCCESS = "0";
  //common errors
  string public constant CALLER_NOT_POOL_ADMIN = "100"; // 'The caller must be the pool admin'
  string public constant CALLER_NOT_ADDRESS_PROVIDER = "101";
  string public constant INVALID_FROM_BALANCE_AFTER_TRANSFER = "102";
  string public constant INVALID_TO_BALANCE_AFTER_TRANSFER = "103";
  string public constant CALLER_NOT_ONBEHALFOF_OR_IN_WHITELIST = "104";
  //math library erros
  string public constant MATH_MULTIPLICATION_OVERFLOW = "200";
  string public constant MATH_ADDITION_OVERFLOW = "201";
  string public constant MATH_DIVISION_BY_ZERO = "202";
  //validation & check errors
  string public constant VL_INVALID_AMOUNT = "301"; // 'Amount must be greater than 0'
  string public constant VL_NO_ACTIVE_RESERVE = "302"; // 'Action requires an active reserve'
  string public constant VL_RESERVE_FROZEN = "303"; // 'Action cannot be performed because the reserve is frozen'
  string public constant VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE = "304"; // 'User cannot withdraw more than the available balance'
  string public constant VL_BORROWING_NOT_ENABLED = "305"; // 'Borrowing is not enabled'
  string public constant VL_COLLATERAL_BALANCE_IS_0 = "306"; // 'The collateral balance is 0'
  string public constant VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD = "307"; // 'Health factor is lesser than the liquidation threshold'
  string public constant VL_COLLATERAL_CANNOT_COVER_NEW_BORROW = "308"; // 'There is not enough collateral to cover a new borrow'
  string public constant VL_NO_DEBT_OF_SELECTED_TYPE = "309"; // 'for repayment of stable debt, the user needs to have stable debt, otherwise, he needs to have variable debt'
  string public constant VL_NO_ACTIVE_NFT = "310";
  string public constant VL_NFT_FROZEN = "311";
  string public constant VL_SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER = "312"; // 'User did not borrow the specified currency'
  string public constant VL_INVALID_HEALTH_FACTOR = "313";
  string public constant VL_INVALID_ONBEHALFOF_ADDRESS = "314";
  string public constant VL_INVALID_TARGET_ADDRESS = "315";
  string public constant VL_INVALID_RESERVE_ADDRESS = "316";
  string public constant VL_SPECIFIED_LOAN_NOT_BORROWED_BY_USER = "317";
  string public constant VL_SPECIFIED_RESERVE_NOT_BORROWED_BY_USER = "318";
  string public constant VL_HEALTH_FACTOR_HIGHER_THAN_LIQUIDATION_THRESHOLD = "319";
  //lend pool errors
  string public constant LP_CALLER_NOT_LEND_POOL_CONFIGURATOR = "400"; // 'The caller of the function is not the lending pool configurator'
  string public constant LP_IS_PAUSED = "401"; // 'Pool is paused'
  string public constant LP_NO_MORE_RESERVES_ALLOWED = "402";
  string public constant LP_NOT_CONTRACT = "403";
  string public constant LP_BORROW_NOT_EXCEED_LIQUIDATION_THRESHOLD = "404";
  string public constant LP_BORROW_IS_EXCEED_LIQUIDATION_PRICE = "405";
  string public constant LP_NO_MORE_NFTS_ALLOWED = "406";
  string public constant LP_INVALIED_USER_NFT_AMOUNT = "407";
  string public constant LP_INCONSISTENT_PARAMS = "408";
  string public constant LP_NFT_IS_NOT_USED_AS_COLLATERAL = "409";
  string public constant LP_CALLER_MUST_BE_AN_BTOKEN = "410";
  string public constant LP_INVALIED_NFT_AMOUNT = "411";
  string public constant LP_NFT_HAS_USED_AS_COLLATERAL = "412";
  string public constant LP_DELEGATE_CALL_FAILED = "413";
  string public constant LP_AMOUNT_LESS_THAN_EXTRA_DEBT = "414";
  string public constant LP_AMOUNT_LESS_THAN_REDEEM_THRESHOLD = "415";
  string public constant LP_AMOUNT_GREATER_THAN_MAX_REPAY = "416";
  //lend pool loan errors
  string public constant LPL_INVALID_LOAN_STATE = "480";
  string public constant LPL_INVALID_LOAN_AMOUNT = "481";
  string public constant LPL_INVALID_TAKEN_AMOUNT = "482";
  string public constant LPL_AMOUNT_OVERFLOW = "483";
  string public constant LPL_BID_PRICE_LESS_THAN_LIQUIDATION_PRICE = "484";
  string public constant LPL_BID_PRICE_LESS_THAN_HIGHEST_PRICE = "485";
  string public constant LPL_BID_REDEEM_DURATION_HAS_END = "486";
  string public constant LPL_BID_USER_NOT_SAME = "487";
  string public constant LPL_BID_REPAY_AMOUNT_NOT_ENOUGH = "488";
  string public constant LPL_BID_AUCTION_DURATION_HAS_END = "489";
  string public constant LPL_BID_AUCTION_DURATION_NOT_END = "490";
  string public constant LPL_BID_PRICE_LESS_THAN_BORROW = "491";
  string public constant LPL_INVALID_BIDDER_ADDRESS = "492";
  string public constant LPL_AMOUNT_LESS_THAN_BID_FINE = "493";
  string public constant LPL_BID_INVALID_BID_FINE = "494";
  //common token errors
  string public constant CT_CALLER_MUST_BE_LEND_POOL = "500"; // 'The caller of this function must be a lending pool'
  string public constant CT_INVALID_MINT_AMOUNT = "501"; //invalid amount to mint
  string public constant CT_INVALID_BURN_AMOUNT = "502"; //invalid amount to burn
  string public constant CT_BORROW_ALLOWANCE_NOT_ENOUGH = "503";
  //reserve logic errors
  string public constant RL_RESERVE_ALREADY_INITIALIZED = "601"; // 'Reserve has already been initialized'
  string public constant RL_LIQUIDITY_INDEX_OVERFLOW = "602"; //  Liquidity index overflows uint128
  string public constant RL_VARIABLE_BORROW_INDEX_OVERFLOW = "603"; //  Variable borrow index overflows uint128
  string public constant RL_LIQUIDITY_RATE_OVERFLOW = "604"; //  Liquidity rate overflows uint128
  string public constant RL_VARIABLE_BORROW_RATE_OVERFLOW = "605"; //  Variable borrow rate overflows uint128
  //configure errors
  string public constant LPC_RESERVE_LIQUIDITY_NOT_0 = "700"; // 'The liquidity of the reserve needs to be 0'
  string public constant LPC_INVALID_CONFIGURATION = "701"; // 'Invalid risk parameters for the reserve'
  string public constant LPC_CALLER_NOT_EMERGENCY_ADMIN = "702"; // 'The caller must be the emergency admin'
  string public constant LPC_INVALIED_BNFT_ADDRESS = "703";
  string public constant LPC_INVALIED_LOAN_ADDRESS = "704";
  string public constant LPC_NFT_LIQUIDITY_NOT_0 = "705";
  //reserve config errors
  string public constant RC_INVALID_LTV = "730";
  string public constant RC_INVALID_LIQ_THRESHOLD = "731";
  string public constant RC_INVALID_LIQ_BONUS = "732";
  string public constant RC_INVALID_DECIMALS = "733";
  string public constant RC_INVALID_RESERVE_FACTOR = "734";
  string public constant RC_INVALID_REDEEM_DURATION = "735";
  string public constant RC_INVALID_AUCTION_DURATION = "736";
  string public constant RC_INVALID_REDEEM_FINE = "737";
  string public constant RC_INVALID_REDEEM_THRESHOLD = "738";
  //address provider erros
  string public constant LPAPR_PROVIDER_NOT_REGISTERED = "760"; // 'Provider is not registered'
  string public constant LPAPR_INVALID_ADDRESSES_PROVIDER_ID = "761";
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ILendPoolAddressesProvider} from "./ILendPoolAddressesProvider.sol";
import {DataTypes} from "../libraries/types/DataTypes.sol";
interface ILendPool {
  /**
   * @dev Emitted on deposit()
   * @param user The address initiating the deposit
   * @param amount The amount deposited
   * @param reserve The address of the underlying asset of the reserve
   * @param onBehalfOf The beneficiary of the deposit, receiving the bTokens
   * @param referral The referral code used
   **/
  event Deposit(
    address user,
    address indexed reserve,
    uint256 amount,
    address indexed onBehalfOf,
    uint16 indexed referral
  );
  /**
   * @dev Emitted on withdraw()
   * @param user The address initiating the withdrawal, owner of bTokens
   * @param reserve The address of the underlyng asset being withdrawn
   * @param amount The amount to be withdrawn
   * @param to Address that will receive the underlying
   **/
  event Withdraw(address indexed user, address indexed reserve, uint256 amount, address indexed to);
  /**
   * @dev Emitted on borrow() when loan needs to be opened
   * @param user The address of the user initiating the borrow(), receiving the funds
   * @param reserve The address of the underlying asset being borrowed
   * @param amount The amount borrowed out
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param onBehalfOf The address that will be getting the loan
   * @param referral The referral code used
   **/
  event Borrow(
    address user,
    address indexed reserve,
    uint256 amount,
    address nftAsset,
    uint256 nftTokenId,
    address indexed onBehalfOf,
    uint256 borrowRate,
    uint256 loanId,
    uint16 indexed referral
  );
  /**
   * @dev Emitted on repay()
   * @param user The address of the user initiating the repay(), providing the funds
   * @param reserve The address of the underlying asset of the reserve
   * @param amount The amount repaid
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param borrower The beneficiary of the repayment, getting his debt reduced
   * @param loanId The loan ID of the NFT loans
   **/
  event Repay(
    address user,
    address indexed reserve,
    uint256 amount,
    address indexed nftAsset,
    uint256 nftTokenId,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted when a borrower's loan is auctioned.
   * @param user The address of the user initiating the auction
   * @param reserve The address of the underlying asset of the reserve
   * @param bidPrice The price of the underlying reserve given by the bidder
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param onBehalfOf The address that will be getting the NFT
   * @param loanId The loan ID of the NFT loans
   **/
  event Auction(
    address user,
    address indexed reserve,
    uint256 bidPrice,
    address indexed nftAsset,
    uint256 nftTokenId,
    address onBehalfOf,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted on redeem()
   * @param user The address of the user initiating the redeem(), providing the funds
   * @param reserve The address of the underlying asset of the reserve
   * @param borrowAmount The borrow amount repaid
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param loanId The loan ID of the NFT loans
   **/
  event Redeem(
    address user,
    address indexed reserve,
    uint256 borrowAmount,
    uint256 fineAmount,
    address indexed nftAsset,
    uint256 nftTokenId,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted when a borrower's loan is liquidated.
   * @param user The address of the user initiating the auction
   * @param reserve The address of the underlying asset of the reserve
   * @param repayAmount The amount of reserve repaid by the liquidator
   * @param remainAmount The amount of reserve received by the borrower
   * @param loanId The loan ID of the NFT loans
   **/
  event Liquidate(
    address user,
    address indexed reserve,
    uint256 repayAmount,
    uint256 remainAmount,
    address indexed nftAsset,
    uint256 nftTokenId,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted when the pause is triggered.
   */
  event Paused();
  /**
   * @dev Emitted when the pause is lifted.
   */
  event Unpaused();
  /**
   * @dev Emitted when the state of a reserve is updated. NOTE: This event is actually declared
   * in the ReserveLogic library and emitted in the updateInterestRates() function. Since the function is internal,
   * the event will actually be fired by the LendPool contract. The event is therefore replicated here so it
   * gets added to the LendPool ABI
   * @param reserve The address of the underlying asset of the reserve
   * @param liquidityRate The new liquidity rate
   * @param variableBorrowRate The new variable borrow rate
   * @param liquidityIndex The new liquidity index
   * @param variableBorrowIndex The new variable borrow index
   **/
  event ReserveDataUpdated(
    address indexed reserve,
    uint256 liquidityRate,
    uint256 variableBorrowRate,
    uint256 liquidityIndex,
    uint256 variableBorrowIndex
  );
  /**
   * @dev Deposits an `amount` of underlying asset into the reserve, receiving in return overlying bTokens.
   * - E.g. User deposits 100 USDC and gets in return 100 bUSDC
   * @param reserve The address of the underlying asset to deposit
   * @param amount The amount to be deposited
   * @param onBehalfOf The address that will receive the bTokens, same as msg.sender if the user
   *   wants to receive them on his own wallet, or a different address if the beneficiary of bTokens
   *   is a different wallet
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   **/
  function deposit(
    address reserve,
    uint256 amount,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  /**
   * @dev Withdraws an `amount` of underlying asset from the reserve, burning the equivalent bTokens owned
   * E.g. User has 100 bUSDC, calls withdraw() and receives 100 USDC, burning the 100 bUSDC
   * @param reserve The address of the underlying asset to withdraw
   * @param amount The underlying amount to be withdrawn
   *   - Send the value type(uint256).max in order to withdraw the whole bToken balance
   * @param to Address that will receive the underlying, same as msg.sender if the user
   *   wants to receive it on his own wallet, or a different address if the beneficiary is a
   *   different wallet
   * @return The final amount withdrawn
   **/
  function withdraw(
    address reserve,
    uint256 amount,
    address to
  ) external returns (uint256);
  /**
   * @dev Allows users to borrow a specific `amount` of the reserve underlying asset, provided that the borrower
   * already deposited enough collateral
   * - E.g. User borrows 100 USDC, receiving the 100 USDC in his wallet
   *   and lock collateral asset in contract
   * @param reserveAsset The address of the underlying asset to borrow
   * @param amount The amount to be borrowed
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param onBehalfOf Address of the user who will receive the loan. Should be the address of the borrower itself
   * calling the function if he wants to borrow against his own collateral, or the address of the credit delegator
   * if he has been given credit delegation allowance
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   **/
  function borrow(
    address reserveAsset,
    uint256 amount,
    address nftAsset,
    uint256 nftTokenId,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  function batchBorrow(
    address[] calldata assets,
    uint256[] calldata amounts,
    address[] calldata nftAssets,
    uint256[] calldata nftTokenIds,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  /**
   * @notice Repays a borrowed `amount` on a specific reserve, burning the equivalent loan owned
   * - E.g. User repays 100 USDC, burning loan and receives collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param amount The amount to repay
   * @return The final amount repaid, loan is burned or not
   **/
  function repay(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount
  ) external returns (uint256, bool);
  function batchRepay(
    address[] calldata nftAssets,
    uint256[] calldata nftTokenIds,
    uint256[] calldata amounts
  ) external returns (uint256[] memory, bool[] memory);
  /**
   * @dev Function to auction a non-healthy position collateral-wise
   * - The caller (liquidator) want to buy collateral asset of the user getting liquidated
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param bidPrice The bid price of the liquidator want to buy the underlying NFT
   * @param onBehalfOf Address of the user who will get the underlying NFT, same as msg.sender if the user
   *   wants to receive them on his own wallet, or a different address if the beneficiary of NFT
   *   is a different wallet
   **/
  function auction(
    address nftAsset,
    uint256 nftTokenId,
    uint256 bidPrice,
    address onBehalfOf
  ) external;
  /**
   * @notice Redeem a NFT loan which state is in Auction
   * - E.g. User repays 100 USDC, burning loan and receives collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param amount The amount to repay the debt
   * @param bidFine The amount of bid fine
   **/
  function redeem(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount,
    uint256 bidFine
  ) external returns (uint256);
  /**
   * @dev Function to liquidate a non-healthy position collateral-wise
   * - The caller (liquidator) buy collateral asset of the user getting liquidated, and receives
   *   the collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   **/
  function liquidate(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount
  ) external returns (uint256);
  /**
   * @dev Validates and finalizes an bToken transfer
   * - Only callable by the overlying bToken of the `asset`
   * @param asset The address of the underlying asset of the bToken
   * @param from The user from which the bTokens are transferred
   * @param to The user receiving the bTokens
   * @param amount The amount being transferred/withdrawn
   * @param balanceFromBefore The bToken balance of the `from` user before the transfer
   * @param balanceToBefore The bToken balance of the `to` user before the transfer
   */
  function finalizeTransfer(
    address asset,
    address from,
    address to,
    uint256 amount,
    uint256 balanceFromBefore,
    uint256 balanceToBefore
  ) external view;
  function getReserveConfiguration(address asset) external view returns (DataTypes.ReserveConfigurationMap memory);
  function getNftConfiguration(address asset) external view returns (DataTypes.NftConfigurationMap memory);
  /**
   * @dev Returns the normalized income normalized income of the reserve
   * @param asset The address of the underlying asset of the reserve
   * @return The reserve's normalized income
   */
  function getReserveNormalizedIncome(address asset) external view returns (uint256);
  /**
   * @dev Returns the normalized variable debt per unit of asset
   * @param asset The address of the underlying asset of the reserve
   * @return The reserve normalized variable debt
   */
  function getReserveNormalizedVariableDebt(address asset) external view returns (uint256);
  /**
   * @dev Returns the state and configuration of the reserve
   * @param asset The address of the underlying asset of the reserve
   * @return The state of the reserve
   **/
  function getReserveData(address asset) external view returns (DataTypes.ReserveData memory);
  function getReservesList() external view returns (address[] memory);
  function getNftData(address asset) external view returns (DataTypes.NftData memory);
  /**
   * @dev Returns the loan data of the NFT
   * @param nftAsset The address of the NFT
   * @param reserveAsset The address of the Reserve
   * @return totalCollateralInETH the total collateral in ETH of the NFT
   * @return totalCollateralInReserve the total collateral in Reserve of the NFT
   * @return availableBorrowsInETH the borrowing power in ETH of the NFT
   * @return availableBorrowsInReserve the borrowing power in Reserve of the NFT
   * @return ltv the loan to value of the user
   * @return liquidationThreshold the liquidation threshold of the NFT
   * @return liquidationBonus the liquidation bonus of the NFT
   **/
  function getNftCollateralData(address nftAsset, address reserveAsset)
    external
    view
    returns (
      uint256 totalCollateralInETH,
      uint256 totalCollateralInReserve,
      uint256 availableBorrowsInETH,
      uint256 availableBorrowsInReserve,
      uint256 ltv,
      uint256 liquidationThreshold,
      uint256 liquidationBonus
    );
  /**
   * @dev Returns the debt data of the NFT
   * @param nftAsset The address of the NFT
   * @param nftTokenId The token id of the NFT
   * @return loanId the loan id of the NFT
   * @return reserveAsset the address of the Reserve
   * @return totalCollateral the total power of the NFT
   * @return totalDebt the total debt of the NFT
   * @return availableBorrows the borrowing power left of the NFT
   * @return healthFactor the current health factor of the NFT
   **/
  function getNftDebtData(address nftAsset, uint256 nftTokenId)
    external
    view
    returns (
      uint256 loanId,
      address reserveAsset,
      uint256 totalCollateral,
      uint256 totalDebt,
      uint256 availableBorrows,
      uint256 healthFactor
    );
  /**
   * @dev Returns the auction data of the NFT
   * @param nftAsset The address of the NFT
   * @param nftTokenId The token id of the NFT
   * @return loanId the loan id of the NFT
   * @return bidderAddress the highest bidder address of the loan
   * @return bidPrice the highest bid price in Reserve of the loan
   * @return bidBorrowAmount the borrow amount in Reserve of the loan
   * @return bidFine the penalty fine of the loan
   **/
  function getNftAuctionData(address nftAsset, uint256 nftTokenId)
    external
    view
    returns (
      uint256 loanId,
      address bidderAddress,
      uint256 bidPrice,
      uint256 bidBorrowAmount,
      uint256 bidFine
    );
  function getNftLiquidatePrice(address nftAsset, uint256 nftTokenId)
    external
    view
    returns (uint256 liquidatePrice, uint256 paybackAmount);
  function getNftsList() external view returns (address[] memory);
  /**
   * @dev Set the _pause state of a reserve
   * - Only callable by the LendPool contract
   * @param val `true` to pause the reserve, `false` to un-pause it
   */
  function setPause(bool val) external;
  /**
   * @dev Returns if the LendPool is paused
   */
  function paused() external view returns (bool);
  function getAddressesProvider() external view returns (ILendPoolAddressesProvider);
  function initReserve(
    address asset,
    address bTokenAddress,
    address debtTokenAddress,
    address interestRateAddress
  ) external;
  function initNft(address asset, address bNftAddress) external;
  function setReserveInterestRateAddress(address asset, address rateAddress) external;
  function setReserveConfiguration(address asset, uint256 configuration) external;
  function setNftConfiguration(address asset, uint256 configuration) external;
  function setMaxNumberOfReserves(uint256 val) external;
  function setMaxNumberOfNfts(uint256 val) external;
  function getMaxNumberOfReserves() external view returns (uint256);
  function getMaxNumberOfNfts() external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {DataTypes} from "../libraries/types/DataTypes.sol";
interface ILendPoolLoan {
  /**
   * @dev Emitted on initialization to share location of dependent notes
   * @param pool The address of the associated lend pool
   */
  event Initialized(address indexed pool);
  /**
   * @dev Emitted when a loan is created
   * @param user The address initiating the action
   */
  event LoanCreated(
    address indexed user,
    address indexed onBehalfOf,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  );
  /**
   * @dev Emitted when a loan is updated
   * @param user The address initiating the action
   */
  event LoanUpdated(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amountAdded,
    uint256 amountTaken,
    uint256 borrowIndex
  );
  /**
   * @dev Emitted when a loan is repaid by the borrower
   * @param user The address initiating the action
   */
  event LoanRepaid(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  );
  /**
   * @dev Emitted when a loan is auction by the liquidator
   * @param user The address initiating the action
   */
  event LoanAuctioned(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount,
    uint256 borrowIndex,
    address bidder,
    uint256 price,
    address previousBidder,
    uint256 previousPrice
  );
  /**
   * @dev Emitted when a loan is redeemed
   * @param user The address initiating the action
   */
  event LoanRedeemed(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amountTaken,
    uint256 borrowIndex
  );
  /**
   * @dev Emitted when a loan is liquidate by the liquidator
   * @param user The address initiating the action
   */
  event LoanLiquidated(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  );
  function initNft(address nftAsset, address bNftAddress) external;
  /**
   * @dev Create store a loan object with some params
   * @param initiator The address of the user initiating the borrow
   * @param onBehalfOf The address receiving the loan
   */
  function createLoan(
    address initiator,
    address onBehalfOf,
    address nftAsset,
    uint256 nftTokenId,
    address bNftAddress,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  ) external returns (uint256);
  /**
   * @dev Update the given loan with some params
   *
   * Requirements:
   *  - The caller must be a holder of the loan
   *  - The loan must be in state Active
   * @param initiator The address of the user initiating the borrow
   */
  function updateLoan(
    address initiator,
    uint256 loanId,
    uint256 amountAdded,
    uint256 amountTaken,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Repay the given loan
   *
   * Requirements:
   *  - The caller must be a holder of the loan
   *  - The caller must send in principal + interest
   *  - The loan must be in state Active
   *
   * @param initiator The address of the user initiating the repay
   * @param loanId The loan getting burned
   * @param bNftAddress The address of bNFT
   */
  function repayLoan(
    address initiator,
    uint256 loanId,
    address bNftAddress,
    uint256 amount,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Auction the given loan
   *
   * Requirements:
   *  - The price must be greater than current highest price
   *  - The loan must be in state Active or Auction
   *
   * @param initiator The address of the user initiating the auction
   * @param loanId The loan getting auctioned
   * @param bidPrice The bid price of this auction
   */
  function auctionLoan(
    address initiator,
    uint256 loanId,
    address onBehalfOf,
    uint256 bidPrice,
    uint256 borrowAmount,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Redeem the given loan with some params
   *
   * Requirements:
   *  - The caller must be a holder of the loan
   *  - The loan must be in state Auction
   * @param initiator The address of the user initiating the borrow
   */
  function redeemLoan(
    address initiator,
    uint256 loanId,
    uint256 amountTaken,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Liquidate the given loan
   *
   * Requirements:
   *  - The caller must send in principal + interest
   *  - The loan must be in state Active
   *
   * @param initiator The address of the user initiating the auction
   * @param loanId The loan getting burned
   * @param bNftAddress The address of bNFT
   */
  function liquidateLoan(
    address initiator,
    uint256 loanId,
    address bNftAddress,
    uint256 borrowAmount,
    uint256 borrowIndex
  ) external;
  function borrowerOf(uint256 loanId) external view returns (address);
  function getCollateralLoanId(address nftAsset, uint256 nftTokenId) external view returns (uint256);
  function getLoan(uint256 loanId) external view returns (DataTypes.LoanData memory loanData);
  function getLoanCollateralAndReserve(uint256 loanId)
    external
    view
    returns (
      address nftAsset,
      uint256 nftTokenId,
      address reserveAsset,
      uint256 scaledAmount
    );
  function getLoanReserveBorrowScaledAmount(uint256 loanId) external view returns (address, uint256);
  function getLoanReserveBorrowAmount(uint256 loanId) external view returns (address, uint256);
  function getLoanHighestBid(uint256 loanId) external view returns (address, uint256);
  function getNftCollateralAmount(address nftAsset) external view returns (uint256);
  function getUserNftCollateralAmount(address user, address nftAsset) external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title LendPoolAddressesProvider contract
 * @dev Main registry of addresses part of or connected to the protocol, including permissioned roles
 * - Acting also as factory of proxies and admin of those, so with right to change its implementations
 * - Owned by the Bend Governance
 * @author Bend
 **/
interface ILendPoolAddressesProvider {
  event MarketIdSet(string newMarketId);
  event LendPoolUpdated(address indexed newAddress, bytes encodedCallData);
  event ConfigurationAdminUpdated(address indexed newAddress);
  event EmergencyAdminUpdated(address indexed newAddress);
  event LendPoolConfiguratorUpdated(address indexed newAddress, bytes encodedCallData);
  event ReserveOracleUpdated(address indexed newAddress);
  event NftOracleUpdated(address indexed newAddress);
  event LendPoolLoanUpdated(address indexed newAddress, bytes encodedCallData);
  event ProxyCreated(bytes32 id, address indexed newAddress);
  event AddressSet(bytes32 id, address indexed newAddress, bool hasProxy, bytes encodedCallData);
  event BNFTRegistryUpdated(address indexed newAddress);
  event LendPoolLiquidatorUpdated(address indexed newAddress);
  event IncentivesControllerUpdated(address indexed newAddress);
  event UIDataProviderUpdated(address indexed newAddress);
  event BendDataProviderUpdated(address indexed newAddress);
  event WalletBalanceProviderUpdated(address indexed newAddress);
  function getMarketId() external view returns (string memory);
  function setMarketId(string calldata marketId) external;
  function setAddress(bytes32 id, address newAddress) external;
  function setAddressAsProxy(
    bytes32 id,
    address impl,
    bytes memory encodedCallData
  ) external;
  function getAddress(bytes32 id) external view returns (address);
  function getLendPool() external view returns (address);
  function setLendPoolImpl(address pool, bytes memory encodedCallData) external;
  function getLendPoolConfigurator() external view returns (address);
  function setLendPoolConfiguratorImpl(address configurator, bytes memory encodedCallData) external;
  function getPoolAdmin() external view returns (address);
  function setPoolAdmin(address admin) external;
  function getEmergencyAdmin() external view returns (address);
  function setEmergencyAdmin(address admin) external;
  function getReserveOracle() external view returns (address);
  function setReserveOracle(address reserveOracle) external;
  function getNFTOracle() external view returns (address);
  function setNFTOracle(address nftOracle) external;
  function getLendPoolLoan() external view returns (address);
  function setLendPoolLoanImpl(address loan, bytes memory encodedCallData) external;
  function getBNFTRegistry() external view returns (address);
  function setBNFTRegistry(address factory) external;
  function getLendPoolLiquidator() external view returns (address);
  function setLendPoolLiquidator(address liquidator) external;
  function getIncentivesController() external view returns (address);
  function setIncentivesController(address controller) external;
  function getUIDataProvider() external view returns (address);
  function setUIDataProvider(address provider) external;
  function getBendDataProvider() external view returns (address);
  function setBendDataProvider(address provider) external;
  function getWalletBalanceProvider() external view returns (address);
  function setWalletBalanceProvider(address provider) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @dev Interface for a permittable ERC721 contract
 * See https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC72 allowance (see {IERC721-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC721-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IPunks {
  function balanceOf(address account) external view returns (uint256);
  function punkIndexToAddress(uint256 punkIndex) external view returns (address owner);
  function buyPunk(uint256 punkIndex) external;
  function transferPunk(address to, uint256 punkIndex) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
/**
 * @dev Interface for a permittable ERC721 contract
 * See https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC72 allowance (see {IERC721-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC721-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IWrappedPunks is IERC721 {
  function punkContract() external view returns (address);
  function mint(uint256 punkIndex) external;
  function burn(uint256 punkIndex) external;
  function registerProxy() external;
  function proxyInfo(address user) external returns (address proxy);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
interface IPunkGateway {
  /**
   * @dev Allows users to borrow a specific `amount` of the reserve underlying asset, provided that the borrower
   * already deposited enough collateral
   * - E.g. User borrows 100 USDC, receiving the 100 USDC in his wallet
   *   and lock collateral asset in contract
   * @param reserveAsset The address of the underlying asset to borrow
   * @param amount The amount to be borrowed
   * @param punkIndex The index of the CryptoPunk used as collteral
   * @param onBehalfOf Address of the user who will receive the loan. Should be the address of the borrower itself
   * calling the function if he wants to borrow against his own collateral, or the address of the credit delegator
   * if he has been given credit delegation allowance
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   **/
  function borrow(
    address reserveAsset,
    uint256 amount,
    uint256 punkIndex,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  function batchBorrow(
    address[] calldata reserveAssets,
    uint256[] calldata amounts,
    uint256[] calldata punkIndexs,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  /**
   * @notice Repays a borrowed `amount` on a specific punk, burning the equivalent loan owned
   * - E.g. User repays 100 USDC, burning loan and receives collateral asset
   * @param punkIndex The index of the CryptoPunk used as collteral
   * @param amount The amount to repay
   * @return The final amount repaid, loan is burned or not
   **/
  function repay(uint256 punkIndex, uint256 amount) external returns (uint256, bool);
  function batchRepay(uint256[] calldata punkIndexs, uint256[] calldata amounts)
    external
    returns (uint256[] memory, bool[] memory);
  /**
   * @notice auction a unhealth punk loan with ERC20 reserve
   * @param punkIndex The index of the CryptoPunk used as collteral
   * @param bidPrice The bid price
   **/
  function auction(
    uint256 punkIndex,
    uint256 bidPrice,
    address onBehalfOf
  ) external;
  /**
   * @notice redeem a unhealth punk loan with ERC20 reserve
   * @param punkIndex The index of the CryptoPunk used as collteral
   * @param amount The amount to repay the debt
   * @param bidFine The amount of bid fine
   **/
  function redeem(
    uint256 punkIndex,
    uint256 amount,
    uint256 bidFine
  ) external returns (uint256);
  /**
   * @notice liquidate a unhealth punk loan with ERC20 reserve
   * @param punkIndex The index of the CryptoPunk used as collteral
   **/
  function liquidate(uint256 punkIndex, uint256 amount) external returns (uint256);
  /**
   * @dev Allows users to borrow a specific `amount` of the reserve underlying asset, provided that the borrower
   * already deposited enough collateral
   * - E.g. User borrows 100 ETH, receiving the 100 ETH in his wallet
   *   and lock collateral asset in contract
   * @param amount The amount to be borrowed
   * @param punkIndex The index of the CryptoPunk to deposit
   * @param onBehalfOf Address of the user who will receive the loan. Should be the address of the borrower itself
   * calling the function if he wants to borrow against his own collateral, or the address of the credit delegator
   * if he has been given credit delegation allowance
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   **/
  function borrowETH(
    uint256 amount,
    uint256 punkIndex,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  function batchBorrowETH(
    uint256[] calldata amounts,
    uint256[] calldata punkIndexs,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  /**
   * @notice Repays a borrowed `amount` on a specific punk with native ETH
   * - E.g. User repays 100 ETH, burning loan and receives collateral asset
   * @param punkIndex The index of the CryptoPunk to repay
   * @param amount The amount to repay
   * @return The final amount repaid, loan is burned or not
   **/
  function repayETH(uint256 punkIndex, uint256 amount) external payable returns (uint256, bool);
  function batchRepayETH(uint256[] calldata punkIndexs, uint256[] calldata amounts)
    external
    payable
    returns (uint256[] memory, bool[] memory);
  /**
   * @notice auction a unhealth punk loan with native ETH
   * @param punkIndex The index of the CryptoPunk to repay
   * @param onBehalfOf Address of the user who will receive the CryptoPunk. Should be the address of the user itself
   * calling the function if he wants to get collateral
   **/
  function auctionETH(uint256 punkIndex, address onBehalfOf) external payable;
  /**
   * @notice liquidate a unhealth punk loan with native ETH
   * @param punkIndex The index of the CryptoPunk to repay
   * @param amount The amount to repay the debt
   * @param bidFine The amount of bid fine
   **/
  function redeemETH(
    uint256 punkIndex,
    uint256 amount,
    uint256 bidFine
  ) external payable returns (uint256);
  /**
   * @notice liquidate a unhealth punk loan with native ETH
   * @param punkIndex The index of the CryptoPunk to repay
   **/
  function liquidateETH(uint256 punkIndex) external payable returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
library DataTypes {
  struct ReserveData {
    //stores the reserve configuration
    ReserveConfigurationMap configuration;
    //the liquidity index. Expressed in ray
    uint128 liquidityIndex;
    //variable borrow index. Expressed in ray
    uint128 variableBorrowIndex;
    //the current supply rate. Expressed in ray
    uint128 currentLiquidityRate;
    //the current variable borrow rate. Expressed in ray
    uint128 currentVariableBorrowRate;
    uint40 lastUpdateTimestamp;
    //tokens addresses
    address bTokenAddress;
    address debtTokenAddress;
    //address of the interest rate strategy
    address interestRateAddress;
    //the id of the reserve. Represents the position in the list of the active reserves
    uint8 id;
  }
  struct NftData {
    //stores the nft configuration
    NftConfigurationMap configuration;
    //address of the bNFT contract
    address bNftAddress;
    //the id of the nft. Represents the position in the list of the active nfts
    uint8 id;
  }
  struct ReserveConfigurationMap {
    //bit 0-15: LTV
    //bit 16-31: Liq. threshold
    //bit 32-47: Liq. bonus
    //bit 48-55: Decimals
    //bit 56: Reserve is active
    //bit 57: reserve is frozen
    //bit 58: borrowing is enabled
    //bit 59: stable rate borrowing enabled
    //bit 60-63: reserved
    //bit 64-79: reserve factor
    uint256 data;
  }
  struct NftConfigurationMap {
    //bit 0-15: LTV
    //bit 16-31: Liq. threshold
    //bit 32-47: Liq. bonus
    //bit 56: NFT is active
    //bit 57: NFT is frozen
    uint256 data;
  }
  /**
   * @dev Enum describing the current state of a loan
   * State change flow:
   *  Created -> Active -> Repaid
   *                    -> Auction -> Defaulted
   */
  enum LoanState {
    // We need a default that is not 'Created' - this is the zero value
    None,
    // The loan data is stored, but not initiated yet.
    Created,
    // The loan has been initialized, funds have been delivered to the borrower and the collateral is held.
    Active,
    // The loan is in auction, higest price liquidator will got chance to claim it.
    Auction,
    // The loan has been repaid, and the collateral has been returned to the borrower. This is a terminal state.
    Repaid,
    // The loan was delinquent and collateral claimed by the liquidator. This is a terminal state.
    Defaulted
  }
  struct LoanData {
    //the id of the nft loan
    uint256 loanId;
    //the current state of the loan
    LoanState state;
    //address of borrower
    address borrower;
    //address of nft asset token
    address nftAsset;
    //the id of nft token
    uint256 nftTokenId;
    //address of reserve asset token
    address reserveAsset;
    //scaled borrow amount. Expressed in ray
    uint256 scaledAmount;
    //start time of first bid time
    uint256 bidStartTimestamp;
    //bidder address of higest bid
    address bidderAddress;
    //price of higest bid
    uint256 bidPrice;
    //borrow amount of loan
    uint256 bidBorrowAmount;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
interface IWETHGateway {
  /**
   * @dev deposits WETH into the reserve, using native ETH. A corresponding amount of the overlying asset (bTokens)
   * is minted.
   * @param onBehalfOf address of the user who will receive the bTokens representing the deposit
   * @param referralCode integrators are assigned a referral code and can potentially receive rewards.
   **/
  function depositETH(address onBehalfOf, uint16 referralCode) external payable;
  /**
   * @dev withdraws the WETH _reserves of msg.sender.
   * @param amount amount of bWETH to withdraw and receive native ETH
   * @param to address of the user who will receive native ETH
   */
  function withdrawETH(uint256 amount, address to) external;
  /**
   * @dev borrow WETH, unwraps to ETH and send both the ETH and DebtTokens to msg.sender, via `approveDelegation` and onBehalf argument in `LendPool.borrow`.
   * @param amount the amount of ETH to borrow
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param onBehalfOf Address of the user who will receive the loan. Should be the address of the borrower itself
   * calling the function if he wants to borrow against his own collateral, or the address of the credit delegator
   * if he has been given credit delegation allowance
   * @param referralCode integrators are assigned a referral code and can potentially receive rewards
   */
  function borrowETH(
    uint256 amount,
    address nftAsset,
    uint256 nftTokenId,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  function batchBorrowETH(
    uint256[] calldata amounts,
    address[] calldata nftAssets,
    uint256[] calldata nftTokenIds,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  /**
   * @dev repays a borrow on the WETH reserve, for the specified amount (or for the whole amount, if uint256(-1) is specified).
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param amount the amount to repay, or uint256(-1) if the user wants to repay everything
   */
  function repayETH(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount
  ) external payable returns (uint256, bool);
  function batchRepayETH(
    address[] calldata nftAssets,
    uint256[] calldata nftTokenIds,
    uint256[] calldata amounts
  ) external payable returns (uint256[] memory, bool[] memory);
  /**
   * @dev auction a borrow on the WETH reserve
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param onBehalfOf Address of the user who will receive the underlying NFT used as collateral.
   * Should be the address of the borrower itself calling the function if he wants to borrow against his own collateral.
   */
  function auctionETH(
    address nftAsset,
    uint256 nftTokenId,
    address onBehalfOf
  ) external payable;
  /**
   * @dev redeems a borrow on the WETH reserve
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param amount The amount to repay the debt
   * @param bidFine The amount of bid fine
   */
  function redeemETH(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount,
    uint256 bidFine
  ) external payable returns (uint256);
  /**
   * @dev liquidates a borrow on the WETH reserve
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   */
  function liquidateETH(address nftAsset, uint256 nftTokenId) external payable returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {IERC721Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
import {IPunks} from "../interfaces/IPunks.sol";
/**
 * @title EmergencyTokenRecovery
 * @notice Add Emergency Recovery Logic to contract implementation
 * @author Bend
 **/
abstract contract EmergencyTokenRecoveryUpgradeable is OwnableUpgradeable {
  event EmergencyEtherTransfer(address indexed to, uint256 amount);
  function __EmergencyTokenRecovery_init() internal onlyInitializing {
    __Ownable_init();
  }
  /**
   * @dev transfer ERC20 from the utility contract, for ERC20 recovery in case of stuck tokens due
   * direct transfers to the contract address.
   * @param token token to transfer
   * @param to recipient of the transfer
   * @param amount amount to send
   */
  function emergencyERC20Transfer(
    address token,
    address to,
    uint256 amount
  ) external onlyOwner {
    IERC20Upgradeable(token).transfer(to, amount);
  }
  /**
   * @dev transfer ERC721 from the utility contract, for ERC721 recovery in case of stuck tokens due
   * direct transfers to the contract address.
   * @param token token to transfer
   * @param to recipient of the transfer
   * @param id token id to send
   */
  function emergencyERC721Transfer(
    address token,
    address to,
    uint256 id
  ) external onlyOwner {
    IERC721Upgradeable(token).safeTransferFrom(address(this), to, id);
  }
  /**
   * @dev transfer CryptoPunks from the utility contract, for punks recovery in case of stuck punks
   * due direct transfers to the contract address.
   * @param to recipient of the transfer
   * @param index punk index to send
   */
  function emergencyPunksTransfer(
    address punks,
    address to,
    uint256 index
  ) external onlyOwner {
    IPunks(punks).transferPunk(to, index);
  }
  /**
   * @dev transfer native Ether from the utility contract, for native Ether recovery in case of stuck Ether
   * due selfdestructs or transfer ether to pre-computated contract address before deployment.
   * @param to recipient of the transfer
   * @param amount amount to send
   */
  function emergencyEtherTransfer(address to, uint256 amount) external onlyOwner {
    (bool success, ) = to.call{value: amount}(new bytes(0));
    require(success, "ETH_TRANSFER_FAILED");
    emit EmergencyEtherTransfer(to, amount);
  }
  uint256[50] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";
/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
        __Context_init_unchained();
    }
    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
    uint256[50] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/utils/Initializable.sol)
pragma solidity ^0.8.0;
import "../../utils/AddressUpgradeable.sol";
/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To initialize the implementation contract, you can either invoke the
 * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() initializer {}
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;
    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;
    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, because in other contexts the
        // contract may have been reentered.
        require(_initializing ? _isConstructor() : !_initialized, "Initializable: contract is already initialized");
        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
        }
    }
    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} modifier, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }
    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)
pragma solidity ^0.8.0;
/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165Upgradeable {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)
pragma solidity ^0.8.0;
/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721ReceiverUpgradeable {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165.sol";
/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);
    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;
    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);
    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;
    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {TransparentUpgradeableProxy} from "@openzeppelin/contracts/proxy/transparent/TransparentUpgradeableProxy.sol";
import "../helpers/Errors.sol";
contract BendUpgradeableProxy is TransparentUpgradeableProxy {
  constructor(
    address _logic,
    address admin_,
    bytes memory _data
  ) payable TransparentUpgradeableProxy(_logic, admin_, _data) {}
  modifier OnlyAdmin() {
    require(msg.sender == _getAdmin(), Errors.CALLER_NOT_POOL_ADMIN);
    _;
  }
  function getImplementation() external view OnlyAdmin returns (address) {
    return _getImplementation();
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/transparent/TransparentUpgradeableProxy.sol)
pragma solidity ^0.8.0;
import "../ERC1967/ERC1967Proxy.sol";
/**
 * @dev This contract implements a proxy that is upgradeable by an admin.
 *
 * To avoid https://medium.com/nomic-labs-blog/malicious-backdoors-in-ethereum-proxies-62629adf3357[proxy selector
 * clashing], which can potentially be used in an attack, this contract uses the
 * https://blog.openzeppelin.com/the-transparent-proxy-pattern/[transparent proxy pattern]. This pattern implies two
 * things that go hand in hand:
 *
 * 1. If any account other than the admin calls the proxy, the call will be forwarded to the implementation, even if
 * that call matches one of the admin functions exposed by the proxy itself.
 * 2. If the admin calls the proxy, it can access the admin functions, but its calls will never be forwarded to the
 * implementation. If the admin tries to call a function on the implementation it will fail with an error that says
 * "admin cannot fallback to proxy target".
 *
 * These properties mean that the admin account can only be used for admin actions like upgrading the proxy or changing
 * the admin, so it's best if it's a dedicated account that is not used for anything else. This will avoid headaches due
 * to sudden errors when trying to call a function from the proxy implementation.
 *
 * Our recommendation is for the dedicated account to be an instance of the {ProxyAdmin} contract. If set up this way,
 * you should think of the `ProxyAdmin` instance as the real administrative interface of your proxy.
 */
contract TransparentUpgradeableProxy is ERC1967Proxy {
    /**
     * @dev Initializes an upgradeable proxy managed by `_admin`, backed by the implementation at `_logic`, and
     * optionally initialized with `_data` as explained in {ERC1967Proxy-constructor}.
     */
    constructor(
        address _logic,
        address admin_,
        bytes memory _data
    ) payable ERC1967Proxy(_logic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        _changeAdmin(admin_);
    }
    /**
     * @dev Modifier used internally that will delegate the call to the implementation unless the sender is the admin.
     */
    modifier ifAdmin() {
        if (msg.sender == _getAdmin()) {
            _;
        } else {
            _fallback();
        }
    }
    /**
     * @dev Returns the current admin.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyAdmin}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function admin() external ifAdmin returns (address admin_) {
        admin_ = _getAdmin();
    }
    /**
     * @dev Returns the current implementation.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyImplementation}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc`
     */
    function implementation() external ifAdmin returns (address implementation_) {
        implementation_ = _implementation();
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-changeProxyAdmin}.
     */
    function changeAdmin(address newAdmin) external virtual ifAdmin {
        _changeAdmin(newAdmin);
    }
    /**
     * @dev Upgrade the implementation of the proxy.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgrade}.
     */
    function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeToAndCall(newImplementation, bytes(""), false);
    }
    /**
     * @dev Upgrade the implementation of the proxy, and then call a function from the new implementation as specified
     * by `data`, which should be an encoded function call. This is useful to initialize new storage variables in the
     * proxied contract.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgradeAndCall}.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable ifAdmin {
        _upgradeToAndCall(newImplementation, data, true);
    }
    /**
     * @dev Returns the current admin.
     */
    function _admin() internal view virtual returns (address) {
        return _getAdmin();
    }
    /**
     * @dev Makes sure the admin cannot access the fallback function. See {Proxy-_beforeFallback}.
     */
    function _beforeFallback() internal virtual override {
        require(msg.sender != _getAdmin(), "TransparentUpgradeableProxy: admin cannot fallback to proxy target");
        super._beforeFallback();
    }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title Errors library
 * @author Bend
 * @notice Defines the error messages emitted by the different contracts of the Bend protocol
 */
library Errors {
  enum ReturnCode {
    SUCCESS,
    FAILED
  }
  string public constant SUCCESS = "0";
  //common errors
  string public constant CALLER_NOT_POOL_ADMIN = "100"; // 'The caller must be the pool admin'
  string public constant CALLER_NOT_ADDRESS_PROVIDER = "101";
  string public constant INVALID_FROM_BALANCE_AFTER_TRANSFER = "102";
  string public constant INVALID_TO_BALANCE_AFTER_TRANSFER = "103";
  //math library erros
  string public constant MATH_MULTIPLICATION_OVERFLOW = "200";
  string public constant MATH_ADDITION_OVERFLOW = "201";
  string public constant MATH_DIVISION_BY_ZERO = "202";
  //validation & check errors
  string public constant VL_INVALID_AMOUNT = "301"; // 'Amount must be greater than 0'
  string public constant VL_NO_ACTIVE_RESERVE = "302"; // 'Action requires an active reserve'
  string public constant VL_RESERVE_FROZEN = "303"; // 'Action cannot be performed because the reserve is frozen'
  string public constant VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE = "304"; // 'User cannot withdraw more than the available balance'
  string public constant VL_BORROWING_NOT_ENABLED = "305"; // 'Borrowing is not enabled'
  string public constant VL_COLLATERAL_BALANCE_IS_0 = "306"; // 'The collateral balance is 0'
  string public constant VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD = "307"; // 'Health factor is lesser than the liquidation threshold'
  string public constant VL_COLLATERAL_CANNOT_COVER_NEW_BORROW = "308"; // 'There is not enough collateral to cover a new borrow'
  string public constant VL_NO_DEBT_OF_SELECTED_TYPE = "309"; // 'for repayment of stable debt, the user needs to have stable debt, otherwise, he needs to have variable debt'
  string public constant VL_NO_ACTIVE_NFT = "310";
  string public constant VL_NFT_FROZEN = "311";
  string public constant VL_SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER = "312"; // 'User did not borrow the specified currency'
  string public constant VL_INVALID_HEALTH_FACTOR = "313";
  string public constant VL_INVALID_ONBEHALFOF_ADDRESS = "314";
  string public constant VL_INVALID_TARGET_ADDRESS = "315";
  string public constant VL_INVALID_RESERVE_ADDRESS = "316";
  string public constant VL_SPECIFIED_LOAN_NOT_BORROWED_BY_USER = "317";
  string public constant VL_SPECIFIED_RESERVE_NOT_BORROWED_BY_USER = "318";
  string public constant VL_HEALTH_FACTOR_HIGHER_THAN_LIQUIDATION_THRESHOLD = "319";
  //lend pool errors
  string public constant LP_CALLER_NOT_LEND_POOL_CONFIGURATOR = "400"; // 'The caller of the function is not the lending pool configurator'
  string public constant LP_IS_PAUSED = "401"; // 'Pool is paused'
  string public constant LP_NO_MORE_RESERVES_ALLOWED = "402";
  string public constant LP_NOT_CONTRACT = "403";
  string public constant LP_BORROW_NOT_EXCEED_LIQUIDATION_THRESHOLD = "404";
  string public constant LP_BORROW_IS_EXCEED_LIQUIDATION_PRICE = "405";
  string public constant LP_NO_MORE_NFTS_ALLOWED = "406";
  string public constant LP_INVALIED_USER_NFT_AMOUNT = "407";
  string public constant LP_INCONSISTENT_PARAMS = "408";
  string public constant LP_NFT_IS_NOT_USED_AS_COLLATERAL = "409";
  string public constant LP_CALLER_MUST_BE_AN_BTOKEN = "410";
  string public constant LP_INVALIED_NFT_AMOUNT = "411";
  string public constant LP_NFT_HAS_USED_AS_COLLATERAL = "412";
  string public constant LP_DELEGATE_CALL_FAILED = "413";
  string public constant LP_AMOUNT_LESS_THAN_EXTRA_DEBT = "414";
  string public constant LP_AMOUNT_LESS_THAN_REDEEM_THRESHOLD = "415";
  //lend pool loan errors
  string public constant LPL_INVALID_LOAN_STATE = "480";
  string public constant LPL_INVALID_LOAN_AMOUNT = "481";
  string public constant LPL_INVALID_TAKEN_AMOUNT = "482";
  string public constant LPL_AMOUNT_OVERFLOW = "483";
  string public constant LPL_BID_PRICE_LESS_THAN_LIQUIDATION_PRICE = "484";
  string public constant LPL_BID_PRICE_LESS_THAN_HIGHEST_PRICE = "485";
  string public constant LPL_BID_REDEEM_DURATION_HAS_END = "486";
  string public constant LPL_BID_USER_NOT_SAME = "487";
  string public constant LPL_BID_REPAY_AMOUNT_NOT_ENOUGH = "488";
  string public constant LPL_BID_AUCTION_DURATION_HAS_END = "489";
  string public constant LPL_BID_AUCTION_DURATION_NOT_END = "490";
  string public constant LPL_BID_PRICE_LESS_THAN_BORROW = "491";
  string public constant LPL_INVALID_BIDDER_ADDRESS = "492";
  string public constant LPL_AMOUNT_LESS_THAN_BID_FINE = "493";
  //common token errors
  string public constant CT_CALLER_MUST_BE_LEND_POOL = "500"; // 'The caller of this function must be a lending pool'
  string public constant CT_INVALID_MINT_AMOUNT = "501"; //invalid amount to mint
  string public constant CT_INVALID_BURN_AMOUNT = "502"; //invalid amount to burn
  //reserve logic errors
  string public constant RL_RESERVE_ALREADY_INITIALIZED = "601"; // 'Reserve has already been initialized'
  string public constant RL_LIQUIDITY_INDEX_OVERFLOW = "602"; //  Liquidity index overflows uint128
  string public constant RL_VARIABLE_BORROW_INDEX_OVERFLOW = "603"; //  Variable borrow index overflows uint128
  string public constant RL_LIQUIDITY_RATE_OVERFLOW = "604"; //  Liquidity rate overflows uint128
  string public constant RL_VARIABLE_BORROW_RATE_OVERFLOW = "605"; //  Variable borrow rate overflows uint128
  //configure errors
  string public constant LPC_RESERVE_LIQUIDITY_NOT_0 = "700"; // 'The liquidity of the reserve needs to be 0'
  string public constant LPC_INVALID_CONFIGURATION = "701"; // 'Invalid risk parameters for the reserve'
  string public constant LPC_CALLER_NOT_EMERGENCY_ADMIN = "702"; // 'The caller must be the emergency admin'
  string public constant LPC_INVALIED_BNFT_ADDRESS = "703";
  string public constant LPC_INVALIED_LOAN_ADDRESS = "704";
  string public constant LPC_NFT_LIQUIDITY_NOT_0 = "705";
  //reserve config errors
  string public constant RC_INVALID_LTV = "730";
  string public constant RC_INVALID_LIQ_THRESHOLD = "731";
  string public constant RC_INVALID_LIQ_BONUS = "732";
  string public constant RC_INVALID_DECIMALS = "733";
  string public constant RC_INVALID_RESERVE_FACTOR = "734";
  string public constant RC_INVALID_REDEEM_DURATION = "735";
  string public constant RC_INVALID_AUCTION_DURATION = "736";
  string public constant RC_INVALID_REDEEM_FINE = "737";
  string public constant RC_INVALID_REDEEM_THRESHOLD = "738";
  //address provider erros
  string public constant LPAPR_PROVIDER_NOT_REGISTERED = "760"; // 'Provider is not registered'
  string public constant LPAPR_INVALID_ADDRESSES_PROVIDER_ID = "761";
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/ERC1967/ERC1967Proxy.sol)
pragma solidity ^0.8.0;
import "../Proxy.sol";
import "./ERC1967Upgrade.sol";
/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 */
contract ERC1967Proxy is Proxy, ERC1967Upgrade {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     *
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _upgradeToAndCall(_logic, _data, false);
    }
    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal view virtual override returns (address impl) {
        return ERC1967Upgrade._getImplementation();
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/Proxy.sol)
pragma solidity ^0.8.0;
/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())
            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())
            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }
    /**
     * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);
    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback() external payable virtual {
        _fallback();
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive() external payable virtual {
        _fallback();
    }
    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/ERC1967/ERC1967Upgrade.sol)
pragma solidity ^0.8.2;
import "../beacon/IBeacon.sol";
import "../../utils/Address.sol";
import "../../utils/StorageSlot.sol";
/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 *
 * @custom:oz-upgrades-unsafe-allow delegatecall
 */
abstract contract ERC1967Upgrade {
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);
    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }
    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }
    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
    }
    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallSecure(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        address oldImplementation = _getImplementation();
        // Initial upgrade and setup call
        _setImplementation(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
        // Perform rollback test if not already in progress
        StorageSlot.BooleanSlot storage rollbackTesting = StorageSlot.getBooleanSlot(_ROLLBACK_SLOT);
        if (!rollbackTesting.value) {
            // Trigger rollback using upgradeTo from the new implementation
            rollbackTesting.value = true;
            Address.functionDelegateCall(
                newImplementation,
                abi.encodeWithSignature("upgradeTo(address)", oldImplementation)
            );
            rollbackTesting.value = false;
            // Check rollback was effective
            require(oldImplementation == _getImplementation(), "ERC1967Upgrade: upgrade breaks further upgrades");
            // Finally reset to the new implementation and log the upgrade
            _upgradeTo(newImplementation);
        }
    }
    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);
    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlot.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }
    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;
    /**
     * @dev Emitted when the beacon is upgraded.
     */
    event BeaconUpgraded(address indexed beacon);
    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(_BEACON_SLOT).value;
    }
    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(Address.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            Address.isContract(IBeacon(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlot.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }
    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(
        address newBeacon,
        bytes memory data,
        bool forceCall
    ) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)
pragma solidity ^0.8.0;
/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)
pragma solidity ^0.8.0;
/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/StorageSlot.sol)
pragma solidity ^0.8.0;
/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }
    struct BooleanSlot {
        bool value;
    }
    struct Bytes32Slot {
        bytes32 value;
    }
    struct Uint256Slot {
        uint256 value;
    }
    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {LendPoolAddressesProvider} from "../protocol/LendPoolAddressesProvider.sol";
import {LendPoolConfigurator} from "../protocol/LendPoolConfigurator.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
contract BTokensAndBNFTsHelper is Ownable {
  LendPoolAddressesProvider public addressesProvider;
  struct ConfigureReserveInput {
    address asset;
    uint256 reserveFactor;
    bool borrowingEnabled;
  }
  struct ConfigureNftInput {
    address asset;
    uint256 baseLTV;
    uint256 liquidationThreshold;
    uint256 liquidationBonus;
    uint256 redeemDuration;
    uint256 auctionDuration;
    uint256 redeemFine;
    uint256 redeemThreshold;
  }
  constructor(address _addressesProvider) {
    addressesProvider = LendPoolAddressesProvider(_addressesProvider);
  }
  function configureReserves(ConfigureReserveInput[] calldata inputParams) external onlyOwner {
    LendPoolConfigurator configurator = LendPoolConfigurator(addressesProvider.getLendPoolConfigurator());
    for (uint256 i = 0; i < inputParams.length; i++) {
      if (inputParams[i].borrowingEnabled) {
        configurator.enableBorrowingOnReserve(inputParams[i].asset);
      }
      configurator.setReserveFactor(inputParams[i].asset, inputParams[i].reserveFactor);
    }
  }
  function configureNfts(ConfigureNftInput[] calldata inputParams) external onlyOwner {
    LendPoolConfigurator configurator = LendPoolConfigurator(addressesProvider.getLendPoolConfigurator());
    for (uint256 i = 0; i < inputParams.length; i++) {
      configurator.configureNftAsCollateral(
        inputParams[i].asset,
        inputParams[i].baseLTV,
        inputParams[i].liquidationThreshold,
        inputParams[i].liquidationBonus
      );
      configurator.configureNftAsAuction(
        inputParams[i].asset,
        inputParams[i].redeemDuration,
        inputParams[i].auctionDuration,
        inputParams[i].redeemFine
      );
      configurator.setNftRedeemThreshold(inputParams[i].asset, inputParams[i].redeemThreshold);
    }
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
// Prettier ignore to prevent buidler flatter bug
// prettier-ignore
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
import {BendUpgradeableProxy} from "../libraries/proxy/BendUpgradeableProxy.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {Address} from "@openzeppelin/contracts/utils/Address.sol";
/**
 * @title LendPoolAddressesProvider contract
 * @dev Main registry of addresses part of or connected to the protocol, including permissioned roles
 * - Acting also as factory of proxies and admin of those, so with right to change its implementations
 * - Owned by the Bend Governance
 * @author Bend
 **/
contract LendPoolAddressesProvider is Ownable, ILendPoolAddressesProvider {
  string private _marketId;
  mapping(bytes32 => address) private _addresses;
  bytes32 private constant LEND_POOL = "LEND_POOL";
  bytes32 private constant LEND_POOL_CONFIGURATOR = "LEND_POOL_CONFIGURATOR";
  bytes32 private constant POOL_ADMIN = "POOL_ADMIN";
  bytes32 private constant EMERGENCY_ADMIN = "EMERGENCY_ADMIN";
  bytes32 private constant RESERVE_ORACLE = "RESERVE_ORACLE";
  bytes32 private constant NFT_ORACLE = "NFT_ORACLE";
  bytes32 private constant BEND_ORACLE = "BEND_ORACLE";
  bytes32 private constant LEND_POOL_LOAN = "LEND_POOL_LOAN";
  bytes32 private constant BNFT_REGISTRY = "BNFT_REGISTRY";
  bytes32 private constant LEND_POOL_LIQUIDATOR = "LEND_POOL_LIQUIDATOR";
  bytes32 private constant INCENTIVES_CONTROLLER = "INCENTIVES_CONTROLLER";
  bytes32 private constant BEND_DATA_PROVIDER = "BEND_DATA_PROVIDER";
  bytes32 private constant UI_DATA_PROVIDER = "UI_DATA_PROVIDER";
  bytes32 private constant WALLET_BALANCE_PROVIDER = "WALLET_BALANCE_PROVIDER";
  constructor(string memory marketId) {
    _setMarketId(marketId);
  }
  /**
   * @dev Returns the id of the Bend market to which this contracts points to
   * @return The market id
   **/
  function getMarketId() external view override returns (string memory) {
    return _marketId;
  }
  /**
   * @dev Allows to set the market which this LendPoolAddressesProvider represents
   * @param marketId The market id
   */
  function setMarketId(string memory marketId) external override onlyOwner {
    _setMarketId(marketId);
  }
  /**
   * @dev General function to update the implementation of a proxy registered with
   * certain `id`. If there is no proxy registered, it will instantiate one and
   * set as implementation the `implementationAddress`
   * IMPORTANT Use this function carefully, only for ids that don't have an explicit
   * setter function, in order to avoid unexpected consequences
   * @param id The id
   * @param implementationAddress The address of the new implementation
   */
  function setAddressAsProxy(
    bytes32 id,
    address implementationAddress,
    bytes memory encodedCallData
  ) external override onlyOwner {
    _updateImpl(id, implementationAddress);
    emit AddressSet(id, implementationAddress, true, encodedCallData);
    if (encodedCallData.length > 0) {
      Address.functionCall(_addresses[id], encodedCallData);
    }
  }
  /**
   * @dev Sets an address for an id replacing the address saved in the addresses map
   * IMPORTANT Use this function carefully, as it will do a hard replacement
   * @param id The id
   * @param newAddress The address to set
   */
  function setAddress(bytes32 id, address newAddress) external override onlyOwner {
    _addresses[id] = newAddress;
    emit AddressSet(id, newAddress, false, new bytes(0));
  }
  /**
   * @dev Returns an address by id
   * @return The address
   */
  function getAddress(bytes32 id) public view override returns (address) {
    return _addresses[id];
  }
  /**
   * @dev Returns the address of the LendPool proxy
   * @return The LendPool proxy address
   **/
  function getLendPool() external view override returns (address) {
    return getAddress(LEND_POOL);
  }
  /**
   * @dev Updates the implementation of the LendPool, or creates the proxy
   * setting the new `pool` implementation on the first time calling it
   * @param pool The new LendPool implementation
   **/
  function setLendPoolImpl(address pool, bytes memory encodedCallData) external override onlyOwner {
    _updateImpl(LEND_POOL, pool);
    emit LendPoolUpdated(pool, encodedCallData);
    if (encodedCallData.length > 0) {
      Address.functionCall(_addresses[LEND_POOL], encodedCallData);
    }
  }
  /**
   * @dev Returns the address of the LendPoolConfigurator proxy
   * @return The LendPoolConfigurator proxy address
   **/
  function getLendPoolConfigurator() external view override returns (address) {
    return getAddress(LEND_POOL_CONFIGURATOR);
  }
  /**
   * @dev Updates the implementation of the LendPoolConfigurator, or creates the proxy
   * setting the new `configurator` implementation on the first time calling it
   * @param configurator The new LendPoolConfigurator implementation
   **/
  function setLendPoolConfiguratorImpl(address configurator, bytes memory encodedCallData) external override onlyOwner {
    _updateImpl(LEND_POOL_CONFIGURATOR, configurator);
    emit LendPoolConfiguratorUpdated(configurator, encodedCallData);
    if (encodedCallData.length > 0) {
      Address.functionCall(_addresses[LEND_POOL_CONFIGURATOR], encodedCallData);
    }
  }
  /**
   * @dev The functions below are getters/setters of addresses that are outside the context
   * of the protocol hence the upgradable proxy pattern is not used
   **/
  function getPoolAdmin() external view override returns (address) {
    return getAddress(POOL_ADMIN);
  }
  function setPoolAdmin(address admin) external override onlyOwner {
    _addresses[POOL_ADMIN] = admin;
    emit ConfigurationAdminUpdated(admin);
  }
  function getEmergencyAdmin() external view override returns (address) {
    return getAddress(EMERGENCY_ADMIN);
  }
  function setEmergencyAdmin(address emergencyAdmin) external override onlyOwner {
    _addresses[EMERGENCY_ADMIN] = emergencyAdmin;
    emit EmergencyAdminUpdated(emergencyAdmin);
  }
  function getReserveOracle() external view override returns (address) {
    return getAddress(RESERVE_ORACLE);
  }
  function setReserveOracle(address reserveOracle) external override onlyOwner {
    _addresses[RESERVE_ORACLE] = reserveOracle;
    emit ReserveOracleUpdated(reserveOracle);
  }
  function getNFTOracle() external view override returns (address) {
    return getAddress(NFT_ORACLE);
  }
  function setNFTOracle(address nftOracle) external override onlyOwner {
    _addresses[NFT_ORACLE] = nftOracle;
    emit NftOracleUpdated(nftOracle);
  }
  function getLendPoolLoan() external view override returns (address) {
    return getAddress(LEND_POOL_LOAN);
  }
  function setLendPoolLoanImpl(address loanAddress, bytes memory encodedCallData) external override onlyOwner {
    _updateImpl(LEND_POOL_LOAN, loanAddress);
    emit LendPoolLoanUpdated(loanAddress, encodedCallData);
    if (encodedCallData.length > 0) {
      Address.functionCall(_addresses[LEND_POOL_LOAN], encodedCallData);
    }
  }
  function getBNFTRegistry() external view override returns (address) {
    return getAddress(BNFT_REGISTRY);
  }
  function setBNFTRegistry(address factory) external override onlyOwner {
    _addresses[BNFT_REGISTRY] = factory;
    emit BNFTRegistryUpdated(factory);
  }
  function getLendPoolLiquidator() external view override returns (address) {
    return getAddress(LEND_POOL_LIQUIDATOR);
  }
  function setLendPoolLiquidator(address liquidator) external override onlyOwner {
    _addresses[LEND_POOL_LIQUIDATOR] = liquidator;
    emit LendPoolLiquidatorUpdated(liquidator);
  }
  function getIncentivesController() external view override returns (address) {
    return getAddress(INCENTIVES_CONTROLLER);
  }
  function setIncentivesController(address controller) external override onlyOwner {
    _addresses[INCENTIVES_CONTROLLER] = controller;
    emit IncentivesControllerUpdated(controller);
  }
  function getUIDataProvider() external view override returns (address) {
    return getAddress(UI_DATA_PROVIDER);
  }
  function setUIDataProvider(address provider) external override onlyOwner {
    _addresses[UI_DATA_PROVIDER] = provider;
    emit UIDataProviderUpdated(provider);
  }
  function getBendDataProvider() external view override returns (address) {
    return getAddress(BEND_DATA_PROVIDER);
  }
  function setBendDataProvider(address provider) external override onlyOwner {
    _addresses[BEND_DATA_PROVIDER] = provider;
    emit BendDataProviderUpdated(provider);
  }
  function getWalletBalanceProvider() external view override returns (address) {
    return getAddress(WALLET_BALANCE_PROVIDER);
  }
  function setWalletBalanceProvider(address provider) external override onlyOwner {
    _addresses[WALLET_BALANCE_PROVIDER] = provider;
    emit WalletBalanceProviderUpdated(provider);
  }
  function getImplementation(address proxyAddress) external view onlyOwner returns (address) {
    BendUpgradeableProxy proxy = BendUpgradeableProxy(payable(proxyAddress));
    return proxy.getImplementation();
  }
  /**
   * @dev Internal function to update the implementation of a specific proxied component of the protocol
   * - If there is no proxy registered in the given `id`, it creates the proxy setting `newAdress`
   *   as implementation and calls the initialize() function on the proxy
   * - If there is already a proxy registered, it just updates the implementation to `newAddress` and
   *   calls the encoded method function via upgradeToAndCall() in the proxy
   * @param id The id of the proxy to be updated
   * @param newAddress The address of the new implementation
   **/
  function _updateImpl(bytes32 id, address newAddress) internal {
    address payable proxyAddress = payable(_addresses[id]);
    if (proxyAddress == address(0)) {
      bytes memory params = abi.encodeWithSignature("initialize(address)", address(this));
      // create proxy, then init proxy & implementation
      BendUpgradeableProxy proxy = new BendUpgradeableProxy(newAddress, address(this), params);
      _addresses[id] = address(proxy);
      emit ProxyCreated(id, address(proxy));
    } else {
      // upgrade implementation
      BendUpgradeableProxy proxy = BendUpgradeableProxy(proxyAddress);
      proxy.upgradeTo(newAddress);
    }
  }
  function _setMarketId(string memory marketId) internal {
    _marketId = marketId;
    emit MarketIdSet(marketId);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ILendPoolLoan} from "../interfaces/ILendPoolLoan.sol";
import {IBToken} from "../interfaces/IBToken.sol";
import {IDebtToken} from "../interfaces/IDebtToken.sol";
import {IBNFT} from "../interfaces/IBNFT.sol";
import {IBNFTRegistry} from "../interfaces/IBNFTRegistry.sol";
import {IIncentivesController} from "../interfaces/IIncentivesController.sol";
import {ILendPoolConfigurator} from "../interfaces/ILendPoolConfigurator.sol";
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
import {ILendPool} from "../interfaces/ILendPool.sol";
import {BendUpgradeableProxy} from "../libraries/proxy/BendUpgradeableProxy.sol";
import {ReserveConfiguration} from "../libraries/configuration/ReserveConfiguration.sol";
import {NftConfiguration} from "../libraries/configuration/NftConfiguration.sol";
import {Errors} from "../libraries/helpers/Errors.sol";
import {PercentageMath} from "../libraries/math/PercentageMath.sol";
import {DataTypes} from "../libraries/types/DataTypes.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {Initializable} from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
/**
 * @title LendPoolConfigurator contract
 * @author Bend
 * @dev Implements the configuration methods for the Bend protocol
 **/
contract LendPoolConfigurator is Initializable, ILendPoolConfigurator {
  using PercentageMath for uint256;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  using NftConfiguration for DataTypes.NftConfigurationMap;
  ILendPoolAddressesProvider internal _addressesProvider;
  modifier onlyPoolAdmin() {
    require(_addressesProvider.getPoolAdmin() == msg.sender, Errors.CALLER_NOT_POOL_ADMIN);
    _;
  }
  modifier onlyEmergencyAdmin() {
    require(_addressesProvider.getEmergencyAdmin() == msg.sender, Errors.LPC_CALLER_NOT_EMERGENCY_ADMIN);
    _;
  }
  function initialize(ILendPoolAddressesProvider provider) public initializer {
    _addressesProvider = provider;
  }
  /**
   * @dev Initializes reserves in batch
   **/
  function batchInitReserve(InitReserveInput[] calldata input) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    for (uint256 i = 0; i < input.length; i++) {
      _initReserve(cachedPool, input[i]);
    }
  }
  function _initReserve(ILendPool pool_, InitReserveInput calldata input) internal {
    address bTokenProxyAddress = _initTokenWithProxy(
      input.bTokenImpl,
      abi.encodeWithSelector(
        IBToken.initialize.selector,
        _addressesProvider,
        input.treasury,
        input.underlyingAsset,
        input.underlyingAssetDecimals,
        input.bTokenName,
        input.bTokenSymbol
      )
    );
    address debtTokenProxyAddress = _initTokenWithProxy(
      input.debtTokenImpl,
      abi.encodeWithSelector(
        IDebtToken.initialize.selector,
        _addressesProvider,
        input.underlyingAsset,
        input.underlyingAssetDecimals,
        input.debtTokenName,
        input.debtTokenSymbol
      )
    );
    pool_.initReserve(input.underlyingAsset, bTokenProxyAddress, debtTokenProxyAddress, input.interestRateAddress);
    DataTypes.ReserveConfigurationMap memory currentConfig = pool_.getReserveConfiguration(input.underlyingAsset);
    currentConfig.setDecimals(input.underlyingAssetDecimals);
    currentConfig.setActive(true);
    currentConfig.setFrozen(false);
    pool_.setReserveConfiguration(input.underlyingAsset, currentConfig.data);
    emit ReserveInitialized(
      input.underlyingAsset,
      bTokenProxyAddress,
      debtTokenProxyAddress,
      input.interestRateAddress
    );
  }
  function batchInitNft(InitNftInput[] calldata input) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    IBNFTRegistry cachedRegistry = _getBNFTRegistry();
    for (uint256 i = 0; i < input.length; i++) {
      _initNft(cachedPool, cachedRegistry, input[i]);
    }
  }
  function _initNft(
    ILendPool pool_,
    IBNFTRegistry registry_,
    InitNftInput calldata input
  ) internal {
    // BNFT proxy and implementation are created in BNFTRegistry
    (address bNftProxy, ) = registry_.getBNFTAddresses(input.underlyingAsset);
    require(bNftProxy != address(0), Errors.LPC_INVALIED_BNFT_ADDRESS);
    pool_.initNft(input.underlyingAsset, bNftProxy);
    DataTypes.NftConfigurationMap memory currentConfig = pool_.getNftConfiguration(input.underlyingAsset);
    currentConfig.setActive(true);
    currentConfig.setFrozen(false);
    pool_.setNftConfiguration(input.underlyingAsset, currentConfig.data);
    emit NftInitialized(input.underlyingAsset, bNftProxy);
  }
  /**
   * @dev Updates the bToken implementation for the reserve
   **/
  function updateBToken(UpdateBTokenInput calldata input) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    DataTypes.ReserveData memory reserveData = cachedPool.getReserveData(input.asset);
    _upgradeTokenImplementation(reserveData.bTokenAddress, input.implementation, input.encodedCallData);
    emit BTokenUpgraded(input.asset, reserveData.bTokenAddress, input.implementation);
  }
  /**
   * @dev Updates the debt token implementation for the asset
   **/
  function updateDebtToken(UpdateDebtTokenInput calldata input) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    DataTypes.ReserveData memory reserveData = cachedPool.getReserveData(input.asset);
    _upgradeTokenImplementation(reserveData.debtTokenAddress, input.implementation, input.encodedCallData);
    emit DebtTokenUpgraded(input.asset, reserveData.debtTokenAddress, input.implementation);
  }
  /**
   * @dev Enables borrowing on a reserve
   * @param asset The address of the underlying asset of the reserve
   **/
  function enableBorrowingOnReserve(address asset) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    DataTypes.ReserveConfigurationMap memory currentConfig = cachedPool.getReserveConfiguration(asset);
    currentConfig.setBorrowingEnabled(true);
    cachedPool.setReserveConfiguration(asset, currentConfig.data);
    emit BorrowingEnabledOnReserve(asset);
  }
  /**
   * @dev Disables borrowing on a reserve
   * @param asset The address of the underlying asset of the reserve
   **/
  function disableBorrowingOnReserve(address asset) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    DataTypes.ReserveConfigurationMap memory currentConfig = cachedPool.getReserveConfiguration(asset);
    currentConfig.setBorrowingEnabled(false);
    cachedPool.setReserveConfiguration(asset, currentConfig.data);
    emit BorrowingDisabledOnReserve(asset);
  }
  /**
   * @dev Activates a reserve
   * @param asset The address of the underlying asset of the reserve
   **/
  function activateReserve(address asset) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    DataTypes.ReserveConfigurationMap memory currentConfig = cachedPool.getReserveConfiguration(asset);
    currentConfig.setActive(true);
    cachedPool.setReserveConfiguration(asset, currentConfig.data);
    emit ReserveActivated(asset);
  }
  /**
   * @dev Deactivates a reserve
   * @param asset The address of the underlying asset of the reserve
   **/
  function deactivateReserve(address asset) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    _checkReserveNoLiquidity(asset);
    DataTypes.ReserveConfigurationMap memory currentConfig = cachedPool.getReserveConfiguration(asset);
    currentConfig.setActive(false);
    cachedPool.setReserveConfiguration(asset, currentConfig.data);
    emit ReserveDeactivated(asset);
  }
  /**
   * @dev Freezes a reserve. A frozen reserve doesn't allow any new deposit, borrow or rate swap
   *  but allows repayments, liquidations, rate rebalances and withdrawals
   * @param asset The address of the underlying asset of the reserve
   **/
  function freezeReserve(address asset) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    DataTypes.ReserveConfigurationMap memory currentConfig = cachedPool.getReserveConfiguration(asset);
    currentConfig.setFrozen(true);
    cachedPool.setReserveConfiguration(asset, currentConfig.data);
    emit ReserveFrozen(asset);
  }
  /**
   * @dev Unfreezes a reserve
   * @param asset The address of the underlying asset of the reserve
   **/
  function unfreezeReserve(address asset) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    DataTypes.ReserveConfigurationMap memory currentConfig = cachedPool.getReserveConfiguration(asset);
    currentConfig.setFrozen(false);
    cachedPool.setReserveConfiguration(asset, currentConfig.data);
    emit ReserveUnfrozen(asset);
  }
  /**
   * @dev Updates the reserve factor of a reserve
   * @param asset The address of the underlying asset of the reserve
   * @param reserveFactor The new reserve factor of the reserve
   **/
  function setReserveFactor(address asset, uint256 reserveFactor) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    DataTypes.ReserveConfigurationMap memory currentConfig = cachedPool.getReserveConfiguration(asset);
    currentConfig.setReserveFactor(reserveFactor);
    cachedPool.setReserveConfiguration(asset, currentConfig.data);
    emit ReserveFactorChanged(asset, reserveFactor);
  }
  /**
   * @dev Sets the interest rate strategy of a reserve
   * @param asset The address of the underlying asset of the reserve
   * @param rateAddress The new address of the interest strategy contract
   **/
  function setReserveInterestRateAddress(address asset, address rateAddress) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    cachedPool.setReserveInterestRateAddress(asset, rateAddress);
    emit ReserveInterestRateChanged(asset, rateAddress);
  }
  /**
   * @dev Configures the NFT collateralization parameters
   * all the values are expressed in percentages with two decimals of precision. A valid value is 10000, which means 100.00%
   * @param asset The address of the underlying asset of the reserve
   * @param ltv The loan to value of the asset when used as NFT
   * @param liquidationThreshold The threshold at which loans using this asset as collateral will be considered undercollateralized
   * @param liquidationBonus The bonus liquidators receive to liquidate this asset. The values is always below 100%. A value of 5%
   * means the liquidator will receive a 5% bonus
   **/
  function configureNftAsCollateral(
    address asset,
    uint256 ltv,
    uint256 liquidationThreshold,
    uint256 liquidationBonus
  ) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    DataTypes.NftConfigurationMap memory currentConfig = cachedPool.getNftConfiguration(asset);
    //validation of the parameters: the LTV can
    //only be lower or equal than the liquidation threshold
    //(otherwise a loan against the asset would cause instantaneous liquidation)
    require(ltv <= liquidationThreshold, Errors.LPC_INVALID_CONFIGURATION);
    if (liquidationThreshold != 0) {
      //liquidation bonus must be smaller than 100.00%
      require(liquidationBonus < PercentageMath.PERCENTAGE_FACTOR, Errors.LPC_INVALID_CONFIGURATION);
    } else {
      require(liquidationBonus == 0, Errors.LPC_INVALID_CONFIGURATION);
    }
    currentConfig.setLtv(ltv);
    currentConfig.setLiquidationThreshold(liquidationThreshold);
    currentConfig.setLiquidationBonus(liquidationBonus);
    cachedPool.setNftConfiguration(asset, currentConfig.data);
    emit NftConfigurationChanged(asset, ltv, liquidationThreshold, liquidationBonus);
  }
  /**
   * @dev Activates a NFT
   * @param asset The address of the underlying asset of the NFT
   **/
  function activateNft(address asset) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    DataTypes.NftConfigurationMap memory currentConfig = cachedPool.getNftConfiguration(asset);
    currentConfig.setActive(true);
    cachedPool.setNftConfiguration(asset, currentConfig.data);
    emit NftActivated(asset);
  }
  /**
   * @dev Deactivates a NFT
   * @param asset The address of the underlying asset of the NFT
   **/
  function deactivateNft(address asset) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    _checkNftNoLiquidity(asset);
    DataTypes.NftConfigurationMap memory currentConfig = cachedPool.getNftConfiguration(asset);
    currentConfig.setActive(false);
    cachedPool.setNftConfiguration(asset, currentConfig.data);
    emit NftDeactivated(asset);
  }
  /**
   * @dev Freezes a NFT. A frozen NFT doesn't allow any new borrow
   *  but allows repayments, liquidations
   * @param asset The address of the underlying asset of the NFT
   **/
  function freezeNft(address asset) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    DataTypes.NftConfigurationMap memory currentConfig = cachedPool.getNftConfiguration(asset);
    currentConfig.setFrozen(true);
    cachedPool.setNftConfiguration(asset, currentConfig.data);
    emit NftFrozen(asset);
  }
  /**
   * @dev Unfreezes a NFT
   * @param asset The address of the underlying asset of the NFT
   **/
  function unfreezeNft(address asset) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    DataTypes.NftConfigurationMap memory currentConfig = cachedPool.getNftConfiguration(asset);
    currentConfig.setFrozen(false);
    cachedPool.setNftConfiguration(asset, currentConfig.data);
    emit NftUnfrozen(asset);
  }
  /**
   * @dev Configures the NFT auction parameters
   * @param asset The address of the underlying asset of the reserve
   * @param redeemDuration The threshold at which loans using this asset as collateral will be considered undercollateralized
   * @param auctionDuration The bonus liquidators receive to liquidate this asset.
   **/
  function configureNftAsAuction(
    address asset,
    uint256 redeemDuration,
    uint256 auctionDuration,
    uint256 redeemFine
  ) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    DataTypes.NftConfigurationMap memory currentConfig = cachedPool.getNftConfiguration(asset);
    //validation of the parameters: the redeem duration can
    //only be lower or equal than the auction duration
    require(redeemDuration <= auctionDuration, Errors.LPC_INVALID_CONFIGURATION);
    currentConfig.setRedeemDuration(redeemDuration);
    currentConfig.setAuctionDuration(auctionDuration);
    currentConfig.setRedeemFine(redeemFine);
    cachedPool.setNftConfiguration(asset, currentConfig.data);
    emit NftAuctionChanged(asset, redeemDuration, auctionDuration, redeemFine);
  }
  function setNftRedeemThreshold(address asset, uint256 redeemThreshold) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    DataTypes.NftConfigurationMap memory currentConfig = cachedPool.getNftConfiguration(asset);
    currentConfig.setRedeemThreshold(redeemThreshold);
    cachedPool.setNftConfiguration(asset, currentConfig.data);
    emit NftRedeemThresholdChanged(asset, redeemThreshold);
  }
  function setMaxNumberOfReserves(uint256 newVal) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    //default value is 32
    uint256 curVal = cachedPool.getMaxNumberOfReserves();
    require(newVal > curVal, Errors.LPC_INVALID_CONFIGURATION);
    cachedPool.setMaxNumberOfReserves(newVal);
  }
  function setMaxNumberOfNfts(uint256 newVal) external onlyPoolAdmin {
    ILendPool cachedPool = _getLendPool();
    //default value is 256
    uint256 curVal = cachedPool.getMaxNumberOfNfts();
    require(newVal > curVal, Errors.LPC_INVALID_CONFIGURATION);
    cachedPool.setMaxNumberOfNfts(newVal);
  }
  /**
   * @dev pauses or unpauses all the actions of the protocol, including bToken transfers
   * @param val true if protocol needs to be paused, false otherwise
   **/
  function setPoolPause(bool val) external onlyEmergencyAdmin {
    ILendPool cachedPool = _getLendPool();
    cachedPool.setPause(val);
  }
  function getTokenImplementation(address proxyAddress) external view onlyPoolAdmin returns (address) {
    BendUpgradeableProxy proxy = BendUpgradeableProxy(payable(proxyAddress));
    return proxy.getImplementation();
  }
  function _initTokenWithProxy(address implementation, bytes memory initParams) internal returns (address) {
    BendUpgradeableProxy proxy = new BendUpgradeableProxy(implementation, address(this), initParams);
    return address(proxy);
  }
  function _upgradeTokenImplementation(
    address proxyAddress,
    address implementation,
    bytes memory encodedCallData
  ) internal {
    BendUpgradeableProxy proxy = BendUpgradeableProxy(payable(proxyAddress));
    if (encodedCallData.length > 0) {
      proxy.upgradeToAndCall(implementation, encodedCallData);
    } else {
      proxy.upgradeTo(implementation);
    }
  }
  function _checkReserveNoLiquidity(address asset) internal view {
    DataTypes.ReserveData memory reserveData = _getLendPool().getReserveData(asset);
    uint256 availableLiquidity = IERC20Upgradeable(asset).balanceOf(reserveData.bTokenAddress);
    require(availableLiquidity == 0 && reserveData.currentLiquidityRate == 0, Errors.LPC_RESERVE_LIQUIDITY_NOT_0);
  }
  function _checkNftNoLiquidity(address asset) internal view {
    uint256 collateralAmount = _getLendPoolLoan().getNftCollateralAmount(asset);
    require(collateralAmount == 0, Errors.LPC_NFT_LIQUIDITY_NOT_0);
  }
  function _getLendPool() internal view returns (ILendPool) {
    return ILendPool(_addressesProvider.getLendPool());
  }
  function _getLendPoolLoan() internal view returns (ILendPoolLoan) {
    return ILendPoolLoan(_addressesProvider.getLendPoolLoan());
  }
  function _getIncentivesController() internal view returns (IIncentivesController) {
    return IIncentivesController(_addressesProvider.getIncentivesController());
  }
  function _getBNFTRegistry() internal view returns (IBNFTRegistry) {
    return IBNFTRegistry(_addressesProvider.getBNFTRegistry());
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title LendPoolAddressesProvider contract
 * @dev Main registry of addresses part of or connected to the protocol, including permissioned roles
 * - Acting also as factory of proxies and admin of those, so with right to change its implementations
 * - Owned by the Bend Governance
 * @author Bend
 **/
interface ILendPoolAddressesProvider {
  event MarketIdSet(string newMarketId);
  event LendPoolUpdated(address indexed newAddress, bytes encodedCallData);
  event ConfigurationAdminUpdated(address indexed newAddress);
  event EmergencyAdminUpdated(address indexed newAddress);
  event LendPoolConfiguratorUpdated(address indexed newAddress, bytes encodedCallData);
  event ReserveOracleUpdated(address indexed newAddress);
  event NftOracleUpdated(address indexed newAddress);
  event LendPoolLoanUpdated(address indexed newAddress, bytes encodedCallData);
  event ProxyCreated(bytes32 id, address indexed newAddress);
  event AddressSet(bytes32 id, address indexed newAddress, bool hasProxy, bytes encodedCallData);
  event BNFTRegistryUpdated(address indexed newAddress);
  event LendPoolLiquidatorUpdated(address indexed newAddress);
  event IncentivesControllerUpdated(address indexed newAddress);
  event UIDataProviderUpdated(address indexed newAddress);
  event BendDataProviderUpdated(address indexed newAddress);
  event WalletBalanceProviderUpdated(address indexed newAddress);
  function getMarketId() external view returns (string memory);
  function setMarketId(string calldata marketId) external;
  function setAddress(bytes32 id, address newAddress) external;
  function setAddressAsProxy(
    bytes32 id,
    address impl,
    bytes memory encodedCallData
  ) external;
  function getAddress(bytes32 id) external view returns (address);
  function getLendPool() external view returns (address);
  function setLendPoolImpl(address pool, bytes memory encodedCallData) external;
  function getLendPoolConfigurator() external view returns (address);
  function setLendPoolConfiguratorImpl(address configurator, bytes memory encodedCallData) external;
  function getPoolAdmin() external view returns (address);
  function setPoolAdmin(address admin) external;
  function getEmergencyAdmin() external view returns (address);
  function setEmergencyAdmin(address admin) external;
  function getReserveOracle() external view returns (address);
  function setReserveOracle(address reserveOracle) external;
  function getNFTOracle() external view returns (address);
  function setNFTOracle(address nftOracle) external;
  function getLendPoolLoan() external view returns (address);
  function setLendPoolLoanImpl(address loan, bytes memory encodedCallData) external;
  function getBNFTRegistry() external view returns (address);
  function setBNFTRegistry(address factory) external;
  function getLendPoolLiquidator() external view returns (address);
  function setLendPoolLiquidator(address liquidator) external;
  function getIncentivesController() external view returns (address);
  function setIncentivesController(address controller) external;
  function getUIDataProvider() external view returns (address);
  function setUIDataProvider(address provider) external;
  function getBendDataProvider() external view returns (address);
  function setBendDataProvider(address provider) external;
  function getWalletBalanceProvider() external view returns (address);
  function setWalletBalanceProvider(address provider) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {TransparentUpgradeableProxy} from "@openzeppelin/contracts/proxy/transparent/TransparentUpgradeableProxy.sol";
import "../helpers/Errors.sol";
contract BendUpgradeableProxy is TransparentUpgradeableProxy {
  constructor(
    address _logic,
    address admin_,
    bytes memory _data
  ) payable TransparentUpgradeableProxy(_logic, admin_, _data) {}
  modifier OnlyAdmin() {
    require(msg.sender == _getAdmin(), Errors.CALLER_NOT_POOL_ADMIN);
    _;
  }
  function getImplementation() external view OnlyAdmin returns (address) {
    return _getImplementation();
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)
pragma solidity ^0.8.0;
/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/transparent/TransparentUpgradeableProxy.sol)
pragma solidity ^0.8.0;
import "../ERC1967/ERC1967Proxy.sol";
/**
 * @dev This contract implements a proxy that is upgradeable by an admin.
 *
 * To avoid https://medium.com/nomic-labs-blog/malicious-backdoors-in-ethereum-proxies-62629adf3357[proxy selector
 * clashing], which can potentially be used in an attack, this contract uses the
 * https://blog.openzeppelin.com/the-transparent-proxy-pattern/[transparent proxy pattern]. This pattern implies two
 * things that go hand in hand:
 *
 * 1. If any account other than the admin calls the proxy, the call will be forwarded to the implementation, even if
 * that call matches one of the admin functions exposed by the proxy itself.
 * 2. If the admin calls the proxy, it can access the admin functions, but its calls will never be forwarded to the
 * implementation. If the admin tries to call a function on the implementation it will fail with an error that says
 * "admin cannot fallback to proxy target".
 *
 * These properties mean that the admin account can only be used for admin actions like upgrading the proxy or changing
 * the admin, so it's best if it's a dedicated account that is not used for anything else. This will avoid headaches due
 * to sudden errors when trying to call a function from the proxy implementation.
 *
 * Our recommendation is for the dedicated account to be an instance of the {ProxyAdmin} contract. If set up this way,
 * you should think of the `ProxyAdmin` instance as the real administrative interface of your proxy.
 */
contract TransparentUpgradeableProxy is ERC1967Proxy {
    /**
     * @dev Initializes an upgradeable proxy managed by `_admin`, backed by the implementation at `_logic`, and
     * optionally initialized with `_data` as explained in {ERC1967Proxy-constructor}.
     */
    constructor(
        address _logic,
        address admin_,
        bytes memory _data
    ) payable ERC1967Proxy(_logic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        _changeAdmin(admin_);
    }
    /**
     * @dev Modifier used internally that will delegate the call to the implementation unless the sender is the admin.
     */
    modifier ifAdmin() {
        if (msg.sender == _getAdmin()) {
            _;
        } else {
            _fallback();
        }
    }
    /**
     * @dev Returns the current admin.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyAdmin}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function admin() external ifAdmin returns (address admin_) {
        admin_ = _getAdmin();
    }
    /**
     * @dev Returns the current implementation.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyImplementation}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc`
     */
    function implementation() external ifAdmin returns (address implementation_) {
        implementation_ = _implementation();
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-changeProxyAdmin}.
     */
    function changeAdmin(address newAdmin) external virtual ifAdmin {
        _changeAdmin(newAdmin);
    }
    /**
     * @dev Upgrade the implementation of the proxy.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgrade}.
     */
    function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeToAndCall(newImplementation, bytes(""), false);
    }
    /**
     * @dev Upgrade the implementation of the proxy, and then call a function from the new implementation as specified
     * by `data`, which should be an encoded function call. This is useful to initialize new storage variables in the
     * proxied contract.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgradeAndCall}.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable ifAdmin {
        _upgradeToAndCall(newImplementation, data, true);
    }
    /**
     * @dev Returns the current admin.
     */
    function _admin() internal view virtual returns (address) {
        return _getAdmin();
    }
    /**
     * @dev Makes sure the admin cannot access the fallback function. See {Proxy-_beforeFallback}.
     */
    function _beforeFallback() internal virtual override {
        require(msg.sender != _getAdmin(), "TransparentUpgradeableProxy: admin cannot fallback to proxy target");
        super._beforeFallback();
    }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title Errors library
 * @author Bend
 * @notice Defines the error messages emitted by the different contracts of the Bend protocol
 */
library Errors {
  enum ReturnCode {
    SUCCESS,
    FAILED
  }
  string public constant SUCCESS = "0";
  //common errors
  string public constant CALLER_NOT_POOL_ADMIN = "100"; // 'The caller must be the pool admin'
  string public constant CALLER_NOT_ADDRESS_PROVIDER = "101";
  string public constant INVALID_FROM_BALANCE_AFTER_TRANSFER = "102";
  string public constant INVALID_TO_BALANCE_AFTER_TRANSFER = "103";
  string public constant CALLER_NOT_ONBEHALFOF_OR_IN_WHITELIST = "104";
  //math library erros
  string public constant MATH_MULTIPLICATION_OVERFLOW = "200";
  string public constant MATH_ADDITION_OVERFLOW = "201";
  string public constant MATH_DIVISION_BY_ZERO = "202";
  //validation & check errors
  string public constant VL_INVALID_AMOUNT = "301"; // 'Amount must be greater than 0'
  string public constant VL_NO_ACTIVE_RESERVE = "302"; // 'Action requires an active reserve'
  string public constant VL_RESERVE_FROZEN = "303"; // 'Action cannot be performed because the reserve is frozen'
  string public constant VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE = "304"; // 'User cannot withdraw more than the available balance'
  string public constant VL_BORROWING_NOT_ENABLED = "305"; // 'Borrowing is not enabled'
  string public constant VL_COLLATERAL_BALANCE_IS_0 = "306"; // 'The collateral balance is 0'
  string public constant VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD = "307"; // 'Health factor is lesser than the liquidation threshold'
  string public constant VL_COLLATERAL_CANNOT_COVER_NEW_BORROW = "308"; // 'There is not enough collateral to cover a new borrow'
  string public constant VL_NO_DEBT_OF_SELECTED_TYPE = "309"; // 'for repayment of stable debt, the user needs to have stable debt, otherwise, he needs to have variable debt'
  string public constant VL_NO_ACTIVE_NFT = "310";
  string public constant VL_NFT_FROZEN = "311";
  string public constant VL_SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER = "312"; // 'User did not borrow the specified currency'
  string public constant VL_INVALID_HEALTH_FACTOR = "313";
  string public constant VL_INVALID_ONBEHALFOF_ADDRESS = "314";
  string public constant VL_INVALID_TARGET_ADDRESS = "315";
  string public constant VL_INVALID_RESERVE_ADDRESS = "316";
  string public constant VL_SPECIFIED_LOAN_NOT_BORROWED_BY_USER = "317";
  string public constant VL_SPECIFIED_RESERVE_NOT_BORROWED_BY_USER = "318";
  string public constant VL_HEALTH_FACTOR_HIGHER_THAN_LIQUIDATION_THRESHOLD = "319";
  //lend pool errors
  string public constant LP_CALLER_NOT_LEND_POOL_CONFIGURATOR = "400"; // 'The caller of the function is not the lending pool configurator'
  string public constant LP_IS_PAUSED = "401"; // 'Pool is paused'
  string public constant LP_NO_MORE_RESERVES_ALLOWED = "402";
  string public constant LP_NOT_CONTRACT = "403";
  string public constant LP_BORROW_NOT_EXCEED_LIQUIDATION_THRESHOLD = "404";
  string public constant LP_BORROW_IS_EXCEED_LIQUIDATION_PRICE = "405";
  string public constant LP_NO_MORE_NFTS_ALLOWED = "406";
  string public constant LP_INVALIED_USER_NFT_AMOUNT = "407";
  string public constant LP_INCONSISTENT_PARAMS = "408";
  string public constant LP_NFT_IS_NOT_USED_AS_COLLATERAL = "409";
  string public constant LP_CALLER_MUST_BE_AN_BTOKEN = "410";
  string public constant LP_INVALIED_NFT_AMOUNT = "411";
  string public constant LP_NFT_HAS_USED_AS_COLLATERAL = "412";
  string public constant LP_DELEGATE_CALL_FAILED = "413";
  string public constant LP_AMOUNT_LESS_THAN_EXTRA_DEBT = "414";
  string public constant LP_AMOUNT_LESS_THAN_REDEEM_THRESHOLD = "415";
  string public constant LP_AMOUNT_GREATER_THAN_MAX_REPAY = "416";
  //lend pool loan errors
  string public constant LPL_INVALID_LOAN_STATE = "480";
  string public constant LPL_INVALID_LOAN_AMOUNT = "481";
  string public constant LPL_INVALID_TAKEN_AMOUNT = "482";
  string public constant LPL_AMOUNT_OVERFLOW = "483";
  string public constant LPL_BID_PRICE_LESS_THAN_LIQUIDATION_PRICE = "484";
  string public constant LPL_BID_PRICE_LESS_THAN_HIGHEST_PRICE = "485";
  string public constant LPL_BID_REDEEM_DURATION_HAS_END = "486";
  string public constant LPL_BID_USER_NOT_SAME = "487";
  string public constant LPL_BID_REPAY_AMOUNT_NOT_ENOUGH = "488";
  string public constant LPL_BID_AUCTION_DURATION_HAS_END = "489";
  string public constant LPL_BID_AUCTION_DURATION_NOT_END = "490";
  string public constant LPL_BID_PRICE_LESS_THAN_BORROW = "491";
  string public constant LPL_INVALID_BIDDER_ADDRESS = "492";
  string public constant LPL_AMOUNT_LESS_THAN_BID_FINE = "493";
  string public constant LPL_BID_INVALID_BID_FINE = "494";
  //common token errors
  string public constant CT_CALLER_MUST_BE_LEND_POOL = "500"; // 'The caller of this function must be a lending pool'
  string public constant CT_INVALID_MINT_AMOUNT = "501"; //invalid amount to mint
  string public constant CT_INVALID_BURN_AMOUNT = "502"; //invalid amount to burn
  string public constant CT_BORROW_ALLOWANCE_NOT_ENOUGH = "503";
  //reserve logic errors
  string public constant RL_RESERVE_ALREADY_INITIALIZED = "601"; // 'Reserve has already been initialized'
  string public constant RL_LIQUIDITY_INDEX_OVERFLOW = "602"; //  Liquidity index overflows uint128
  string public constant RL_VARIABLE_BORROW_INDEX_OVERFLOW = "603"; //  Variable borrow index overflows uint128
  string public constant RL_LIQUIDITY_RATE_OVERFLOW = "604"; //  Liquidity rate overflows uint128
  string public constant RL_VARIABLE_BORROW_RATE_OVERFLOW = "605"; //  Variable borrow rate overflows uint128
  //configure errors
  string public constant LPC_RESERVE_LIQUIDITY_NOT_0 = "700"; // 'The liquidity of the reserve needs to be 0'
  string public constant LPC_INVALID_CONFIGURATION = "701"; // 'Invalid risk parameters for the reserve'
  string public constant LPC_CALLER_NOT_EMERGENCY_ADMIN = "702"; // 'The caller must be the emergency admin'
  string public constant LPC_INVALIED_BNFT_ADDRESS = "703";
  string public constant LPC_INVALIED_LOAN_ADDRESS = "704";
  string public constant LPC_NFT_LIQUIDITY_NOT_0 = "705";
  //reserve config errors
  string public constant RC_INVALID_LTV = "730";
  string public constant RC_INVALID_LIQ_THRESHOLD = "731";
  string public constant RC_INVALID_LIQ_BONUS = "732";
  string public constant RC_INVALID_DECIMALS = "733";
  string public constant RC_INVALID_RESERVE_FACTOR = "734";
  string public constant RC_INVALID_REDEEM_DURATION = "735";
  string public constant RC_INVALID_AUCTION_DURATION = "736";
  string public constant RC_INVALID_REDEEM_FINE = "737";
  string public constant RC_INVALID_REDEEM_THRESHOLD = "738";
  //address provider erros
  string public constant LPAPR_PROVIDER_NOT_REGISTERED = "760"; // 'Provider is not registered'
  string public constant LPAPR_INVALID_ADDRESSES_PROVIDER_ID = "761";
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/ERC1967/ERC1967Proxy.sol)
pragma solidity ^0.8.0;
import "../Proxy.sol";
import "./ERC1967Upgrade.sol";
/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 */
contract ERC1967Proxy is Proxy, ERC1967Upgrade {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     *
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _upgradeToAndCall(_logic, _data, false);
    }
    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal view virtual override returns (address impl) {
        return ERC1967Upgrade._getImplementation();
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/Proxy.sol)
pragma solidity ^0.8.0;
/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())
            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())
            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }
    /**
     * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);
    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback() external payable virtual {
        _fallback();
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive() external payable virtual {
        _fallback();
    }
    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/ERC1967/ERC1967Upgrade.sol)
pragma solidity ^0.8.2;
import "../beacon/IBeacon.sol";
import "../../utils/Address.sol";
import "../../utils/StorageSlot.sol";
/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 *
 * @custom:oz-upgrades-unsafe-allow delegatecall
 */
abstract contract ERC1967Upgrade {
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);
    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }
    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }
    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
    }
    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallSecure(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        address oldImplementation = _getImplementation();
        // Initial upgrade and setup call
        _setImplementation(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
        // Perform rollback test if not already in progress
        StorageSlot.BooleanSlot storage rollbackTesting = StorageSlot.getBooleanSlot(_ROLLBACK_SLOT);
        if (!rollbackTesting.value) {
            // Trigger rollback using upgradeTo from the new implementation
            rollbackTesting.value = true;
            Address.functionDelegateCall(
                newImplementation,
                abi.encodeWithSignature("upgradeTo(address)", oldImplementation)
            );
            rollbackTesting.value = false;
            // Check rollback was effective
            require(oldImplementation == _getImplementation(), "ERC1967Upgrade: upgrade breaks further upgrades");
            // Finally reset to the new implementation and log the upgrade
            _upgradeTo(newImplementation);
        }
    }
    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);
    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlot.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }
    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;
    /**
     * @dev Emitted when the beacon is upgraded.
     */
    event BeaconUpgraded(address indexed beacon);
    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(_BEACON_SLOT).value;
    }
    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(Address.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            Address.isContract(IBeacon(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlot.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }
    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(
        address newBeacon,
        bytes memory data,
        bool forceCall
    ) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)
pragma solidity ^0.8.0;
/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/StorageSlot.sol)
pragma solidity ^0.8.0;
/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }
    struct BooleanSlot {
        bool value;
    }
    struct Bytes32Slot {
        bytes32 value;
    }
    struct Uint256Slot {
        uint256 value;
    }
    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {DataTypes} from "../libraries/types/DataTypes.sol";
interface ILendPoolLoan {
  /**
   * @dev Emitted on initialization to share location of dependent notes
   * @param pool The address of the associated lend pool
   */
  event Initialized(address indexed pool);
  /**
   * @dev Emitted when a loan is created
   * @param user The address initiating the action
   */
  event LoanCreated(
    address indexed user,
    address indexed onBehalfOf,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  );
  /**
   * @dev Emitted when a loan is updated
   * @param user The address initiating the action
   */
  event LoanUpdated(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amountAdded,
    uint256 amountTaken,
    uint256 borrowIndex
  );
  /**
   * @dev Emitted when a loan is repaid by the borrower
   * @param user The address initiating the action
   */
  event LoanRepaid(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  );
  /**
   * @dev Emitted when a loan is auction by the liquidator
   * @param user The address initiating the action
   */
  event LoanAuctioned(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount,
    uint256 borrowIndex,
    address bidder,
    uint256 price,
    address previousBidder,
    uint256 previousPrice
  );
  /**
   * @dev Emitted when a loan is redeemed
   * @param user The address initiating the action
   */
  event LoanRedeemed(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amountTaken,
    uint256 borrowIndex
  );
  /**
   * @dev Emitted when a loan is liquidate by the liquidator
   * @param user The address initiating the action
   */
  event LoanLiquidated(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  );
  function initNft(address nftAsset, address bNftAddress) external;
  /**
   * @dev Create store a loan object with some params
   * @param initiator The address of the user initiating the borrow
   * @param onBehalfOf The address receiving the loan
   */
  function createLoan(
    address initiator,
    address onBehalfOf,
    address nftAsset,
    uint256 nftTokenId,
    address bNftAddress,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  ) external returns (uint256);
  /**
   * @dev Update the given loan with some params
   *
   * Requirements:
   *  - The caller must be a holder of the loan
   *  - The loan must be in state Active
   * @param initiator The address of the user initiating the borrow
   */
  function updateLoan(
    address initiator,
    uint256 loanId,
    uint256 amountAdded,
    uint256 amountTaken,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Repay the given loan
   *
   * Requirements:
   *  - The caller must be a holder of the loan
   *  - The caller must send in principal + interest
   *  - The loan must be in state Active
   *
   * @param initiator The address of the user initiating the repay
   * @param loanId The loan getting burned
   * @param bNftAddress The address of bNFT
   */
  function repayLoan(
    address initiator,
    uint256 loanId,
    address bNftAddress,
    uint256 amount,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Auction the given loan
   *
   * Requirements:
   *  - The price must be greater than current highest price
   *  - The loan must be in state Active or Auction
   *
   * @param initiator The address of the user initiating the auction
   * @param loanId The loan getting auctioned
   * @param bidPrice The bid price of this auction
   */
  function auctionLoan(
    address initiator,
    uint256 loanId,
    address onBehalfOf,
    uint256 bidPrice,
    uint256 borrowAmount,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Redeem the given loan with some params
   *
   * Requirements:
   *  - The caller must be a holder of the loan
   *  - The loan must be in state Auction
   * @param initiator The address of the user initiating the borrow
   */
  function redeemLoan(
    address initiator,
    uint256 loanId,
    uint256 amountTaken,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Liquidate the given loan
   *
   * Requirements:
   *  - The caller must send in principal + interest
   *  - The loan must be in state Active
   *
   * @param initiator The address of the user initiating the auction
   * @param loanId The loan getting burned
   * @param bNftAddress The address of bNFT
   */
  function liquidateLoan(
    address initiator,
    uint256 loanId,
    address bNftAddress,
    uint256 borrowAmount,
    uint256 borrowIndex
  ) external;
  function borrowerOf(uint256 loanId) external view returns (address);
  function getCollateralLoanId(address nftAsset, uint256 nftTokenId) external view returns (uint256);
  function getLoan(uint256 loanId) external view returns (DataTypes.LoanData memory loanData);
  function getLoanCollateralAndReserve(uint256 loanId)
    external
    view
    returns (
      address nftAsset,
      uint256 nftTokenId,
      address reserveAsset,
      uint256 scaledAmount
    );
  function getLoanReserveBorrowScaledAmount(uint256 loanId) external view returns (address, uint256);
  function getLoanReserveBorrowAmount(uint256 loanId) external view returns (address, uint256);
  function getLoanHighestBid(uint256 loanId) external view returns (address, uint256);
  function getNftCollateralAmount(address nftAsset) external view returns (uint256);
  function getUserNftCollateralAmount(address user, address nftAsset) external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ILendPoolAddressesProvider} from "./ILendPoolAddressesProvider.sol";
import {IIncentivesController} from "./IIncentivesController.sol";
import {IScaledBalanceToken} from "./IScaledBalanceToken.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {IERC20MetadataUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/IERC20MetadataUpgradeable.sol";
interface IBToken is IScaledBalanceToken, IERC20Upgradeable, IERC20MetadataUpgradeable {
  /**
   * @dev Emitted when an bToken is initialized
   * @param underlyingAsset The address of the underlying asset
   * @param pool The address of the associated lending pool
   * @param treasury The address of the treasury
   * @param incentivesController The address of the incentives controller for this bToken
   **/
  event Initialized(
    address indexed underlyingAsset,
    address indexed pool,
    address treasury,
    address incentivesController
  );
  /**
   * @dev Initializes the bToken
   * @param addressProvider The address of the address provider where this bToken will be used
   * @param treasury The address of the Bend treasury, receiving the fees on this bToken
   * @param underlyingAsset The address of the underlying asset of this bToken
   */
  function initialize(
    ILendPoolAddressesProvider addressProvider,
    address treasury,
    address underlyingAsset,
    uint8 bTokenDecimals,
    string calldata bTokenName,
    string calldata bTokenSymbol
  ) external;
  /**
   * @dev Emitted after the mint action
   * @param from The address performing the mint
   * @param value The amount being
   * @param index The new liquidity index of the reserve
   **/
  event Mint(address indexed from, uint256 value, uint256 index);
  /**
   * @dev Mints `amount` bTokens to `user`
   * @param user The address receiving the minted tokens
   * @param amount The amount of tokens getting minted
   * @param index The new liquidity index of the reserve
   * @return `true` if the the previous balance of the user was 0
   */
  function mint(
    address user,
    uint256 amount,
    uint256 index
  ) external returns (bool);
  /**
   * @dev Emitted after bTokens are burned
   * @param from The owner of the bTokens, getting them burned
   * @param target The address that will receive the underlying
   * @param value The amount being burned
   * @param index The new liquidity index of the reserve
   **/
  event Burn(address indexed from, address indexed target, uint256 value, uint256 index);
  /**
   * @dev Emitted during the transfer action
   * @param from The user whose tokens are being transferred
   * @param to The recipient
   * @param value The amount being transferred
   * @param index The new liquidity index of the reserve
   **/
  event BalanceTransfer(address indexed from, address indexed to, uint256 value, uint256 index);
  /**
   * @dev Burns bTokens from `user` and sends the equivalent amount of underlying to `receiverOfUnderlying`
   * @param user The owner of the bTokens, getting them burned
   * @param receiverOfUnderlying The address that will receive the underlying
   * @param amount The amount being burned
   * @param index The new liquidity index of the reserve
   **/
  function burn(
    address user,
    address receiverOfUnderlying,
    uint256 amount,
    uint256 index
  ) external;
  /**
   * @dev Mints bTokens to the reserve treasury
   * @param amount The amount of tokens getting minted
   * @param index The new liquidity index of the reserve
   */
  function mintToTreasury(uint256 amount, uint256 index) external;
  /**
   * @dev Transfers the underlying asset to `target`. Used by the LendPool to transfer
   * assets in borrow(), withdraw() and flashLoan()
   * @param user The recipient of the underlying
   * @param amount The amount getting transferred
   * @return The amount transferred
   **/
  function transferUnderlyingTo(address user, uint256 amount) external returns (uint256);
  /**
   * @dev Returns the address of the incentives controller contract
   **/
  function getIncentivesController() external view returns (IIncentivesController);
  /**
   * @dev Returns the address of the underlying asset of this bToken
   **/
  function UNDERLYING_ASSET_ADDRESS() external view returns (address);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
import {IIncentivesController} from "./IIncentivesController.sol";
import {IScaledBalanceToken} from "./IScaledBalanceToken.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {IERC20MetadataUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/IERC20MetadataUpgradeable.sol";
/**
 * @title IDebtToken
 * @author Bend
 * @notice Defines the basic interface for a debt token.
 **/
interface IDebtToken is IScaledBalanceToken, IERC20Upgradeable, IERC20MetadataUpgradeable {
  /**
   * @dev Emitted when a debt token is initialized
   * @param underlyingAsset The address of the underlying asset
   * @param pool The address of the associated lend pool
   * @param incentivesController The address of the incentives controller
   * @param debtTokenDecimals the decimals of the debt token
   * @param debtTokenName the name of the debt token
   * @param debtTokenSymbol the symbol of the debt token
   **/
  event Initialized(
    address indexed underlyingAsset,
    address indexed pool,
    address incentivesController,
    uint8 debtTokenDecimals,
    string debtTokenName,
    string debtTokenSymbol
  );
  /**
   * @dev Initializes the debt token.
   * @param addressProvider The address of the lend pool
   * @param underlyingAsset The address of the underlying asset
   * @param debtTokenDecimals The decimals of the debtToken, same as the underlying asset's
   * @param debtTokenName The name of the token
   * @param debtTokenSymbol The symbol of the token
   */
  function initialize(
    ILendPoolAddressesProvider addressProvider,
    address underlyingAsset,
    uint8 debtTokenDecimals,
    string memory debtTokenName,
    string memory debtTokenSymbol
  ) external;
  /**
   * @dev Emitted after the mint action
   * @param from The address performing the mint
   * @param value The amount to be minted
   * @param index The last index of the reserve
   **/
  event Mint(address indexed from, uint256 value, uint256 index);
  /**
   * @dev Mints debt token to the `user` address
   * @param user The address receiving the borrowed underlying
   * @param amount The amount of debt being minted
   * @param index The variable debt index of the reserve
   * @return `true` if the the previous balance of the user is 0
   **/
  function mint(
    address user,
    address onBehalfOf,
    uint256 amount,
    uint256 index
  ) external returns (bool);
  /**
   * @dev Emitted when variable debt is burnt
   * @param user The user which debt has been burned
   * @param amount The amount of debt being burned
   * @param index The index of the user
   **/
  event Burn(address indexed user, uint256 amount, uint256 index);
  /**
   * @dev Burns user variable debt
   * @param user The user which debt is burnt
   * @param index The variable debt index of the reserve
   **/
  function burn(
    address user,
    uint256 amount,
    uint256 index
  ) external;
  /**
   * @dev Returns the address of the incentives controller contract
   **/
  function getIncentivesController() external view returns (IIncentivesController);
  /**
   * @dev delegates borrowing power to a user on the specific debt token
   * @param delegatee the address receiving the delegated borrowing power
   * @param amount the maximum amount being delegated. Delegation will still
   * respect the liquidation constraints (even if delegated, a delegatee cannot
   * force a delegator HF to go below 1)
   **/
  function approveDelegation(address delegatee, uint256 amount) external;
  /**
   * @dev returns the borrow allowance of the user
   * @param fromUser The user to giving allowance
   * @param toUser The user to give allowance to
   * @return the current allowance of toUser
   **/
  function borrowAllowance(address fromUser, address toUser) external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IERC721EnumerableUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/extensions/IERC721EnumerableUpgradeable.sol";
import {IERC721MetadataUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/extensions/IERC721MetadataUpgradeable.sol";
import {IERC721ReceiverUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721ReceiverUpgradeable.sol";
interface IBNFT is IERC721MetadataUpgradeable, IERC721ReceiverUpgradeable, IERC721EnumerableUpgradeable {
  /**
   * @dev Emitted when an bNFT is initialized
   * @param underlyingAsset The address of the underlying asset
   **/
  event Initialized(address indexed underlyingAsset);
  /**
   * @dev Emitted on mint
   * @param user The address initiating the burn
   * @param nftAsset address of the underlying asset of NFT
   * @param nftTokenId token id of the underlying asset of NFT
   * @param owner The owner address receive the bNFT token
   **/
  event Mint(address indexed user, address indexed nftAsset, uint256 nftTokenId, address indexed owner);
  /**
   * @dev Emitted on burn
   * @param user The address initiating the burn
   * @param nftAsset address of the underlying asset of NFT
   * @param nftTokenId token id of the underlying asset of NFT
   * @param owner The owner address of the burned bNFT token
   **/
  event Burn(address indexed user, address indexed nftAsset, uint256 nftTokenId, address indexed owner);
  /**
   * @dev Emitted on flashLoan
   * @param target The address of the flash loan receiver contract
   * @param initiator The address initiating the flash loan
   * @param nftAsset address of the underlying asset of NFT
   * @param tokenId The token id of the asset being flash borrowed
   **/
  event FlashLoan(address indexed target, address indexed initiator, address indexed nftAsset, uint256 tokenId);
  /**
   * @dev Initializes the bNFT
   * @param underlyingAsset The address of the underlying asset of this bNFT (E.g. PUNK for bPUNK)
   */
  function initialize(
    address underlyingAsset,
    string calldata bNftName,
    string calldata bNftSymbol
  ) external;
  /**
   * @dev Mints bNFT token to the user address
   *
   * Requirements:
   *  - The caller must be contract address.
   *  - `nftTokenId` must not exist.
   *
   * @param to The owner address receive the bNFT token
   * @param tokenId token id of the underlying asset of NFT
   **/
  function mint(address to, uint256 tokenId) external;
  /**
   * @dev Burns user bNFT token
   *
   * Requirements:
   *  - The caller must be contract address.
   *  - `tokenId` must exist.
   *
   * @param tokenId token id of the underlying asset of NFT
   **/
  function burn(uint256 tokenId) external;
  /**
   * @dev Allows smartcontracts to access the tokens within one transaction, as long as the tokens taken is returned.
   *
   * Requirements:
   *  - `nftTokenIds` must exist.
   *
   * @param receiverAddress The address of the contract receiving the tokens, implementing the IFlashLoanReceiver interface
   * @param nftTokenIds token ids of the underlying asset
   * @param params Variadic packed params to pass to the receiver as extra information
   */
  function flashLoan(
    address receiverAddress,
    uint256[] calldata nftTokenIds,
    bytes calldata params
  ) external;
  /**
   * @dev Returns the owner of the `nftTokenId` token.
   *
   * Requirements:
   *  - `tokenId` must exist.
   *
   * @param tokenId token id of the underlying asset of NFT
   */
  function minterOf(uint256 tokenId) external view returns (address);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
interface IBNFTRegistry {
  event Initialized(address genericImpl, string namePrefix, string symbolPrefix);
  event GenericImplementationUpdated(address genericImpl);
  event BNFTCreated(address indexed nftAsset, address bNftImpl, address bNftProxy, uint256 totals);
  event BNFTUpgraded(address indexed nftAsset, address bNftImpl, address bNftProxy, uint256 totals);
  function getBNFTAddresses(address nftAsset) external view returns (address bNftProxy, address bNftImpl);
  function getBNFTAddressesByIndex(uint16 index) external view returns (address bNftProxy, address bNftImpl);
  function getBNFTAssetList() external view returns (address[] memory);
  function allBNFTAssetLength() external view returns (uint256);
  function initialize(
    address genericImpl,
    string memory namePrefix_,
    string memory symbolPrefix_
  ) external;
  function setBNFTGenericImpl(address genericImpl) external;
  /**
   * @dev Create bNFT proxy and implement, then initialize it
   * @param nftAsset The address of the underlying asset of the BNFT
   **/
  function createBNFT(address nftAsset) external returns (address bNftProxy);
  /**
   * @dev Create bNFT proxy with already deployed implement, then initialize it
   * @param nftAsset The address of the underlying asset of the BNFT
   * @param bNftImpl The address of the deployed implement of the BNFT
   **/
  function createBNFTWithImpl(address nftAsset, address bNftImpl) external returns (address bNftProxy);
  /**
   * @dev Update bNFT proxy to an new deployed implement, then initialize it
   * @param nftAsset The address of the underlying asset of the BNFT
   * @param bNftImpl The address of the deployed implement of the BNFT
   * @param encodedCallData The encoded function call.
   **/
  function upgradeBNFTWithImpl(
    address nftAsset,
    address bNftImpl,
    bytes memory encodedCallData
  ) external;
  /**
   * @dev Adding custom symbol for some special NFTs like CryptoPunks
   * @param nftAssets_ The addresses of the NFTs
   * @param symbols_ The custom symbols of the NFTs
   **/
  function addCustomeSymbols(address[] memory nftAssets_, string[] memory symbols_) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
interface IIncentivesController {
  /**
   * @dev Called by the corresponding asset on any update that affects the rewards distribution
   * @param asset The address of the user
   * @param totalSupply The total supply of the asset in the lending pool
   * @param userBalance The balance of the user of the asset in the lending pool
   **/
  function handleAction(
    address asset,
    uint256 totalSupply,
    uint256 userBalance
  ) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
interface ILendPoolConfigurator {
  struct InitReserveInput {
    address bTokenImpl;
    address debtTokenImpl;
    uint8 underlyingAssetDecimals;
    address interestRateAddress;
    address underlyingAsset;
    address treasury;
    string underlyingAssetName;
    string bTokenName;
    string bTokenSymbol;
    string debtTokenName;
    string debtTokenSymbol;
  }
  struct InitNftInput {
    address underlyingAsset;
  }
  struct UpdateBTokenInput {
    address asset;
    address implementation;
    bytes encodedCallData;
  }
  struct UpdateDebtTokenInput {
    address asset;
    address implementation;
    bytes encodedCallData;
  }
  /**
   * @dev Emitted when a reserve is initialized.
   * @param asset The address of the underlying asset of the reserve
   * @param bToken The address of the associated bToken contract
   * @param debtToken The address of the associated debtToken contract
   * @param interestRateAddress The address of the interest rate strategy for the reserve
   **/
  event ReserveInitialized(
    address indexed asset,
    address indexed bToken,
    address debtToken,
    address interestRateAddress
  );
  /**
   * @dev Emitted when borrowing is enabled on a reserve
   * @param asset The address of the underlying asset of the reserve
   **/
  event BorrowingEnabledOnReserve(address indexed asset);
  /**
   * @dev Emitted when borrowing is disabled on a reserve
   * @param asset The address of the underlying asset of the reserve
   **/
  event BorrowingDisabledOnReserve(address indexed asset);
  /**
   * @dev Emitted when a reserve is activated
   * @param asset The address of the underlying asset of the reserve
   **/
  event ReserveActivated(address indexed asset);
  /**
   * @dev Emitted when a reserve is deactivated
   * @param asset The address of the underlying asset of the reserve
   **/
  event ReserveDeactivated(address indexed asset);
  /**
   * @dev Emitted when a reserve is frozen
   * @param asset The address of the underlying asset of the reserve
   **/
  event ReserveFrozen(address indexed asset);
  /**
   * @dev Emitted when a reserve is unfrozen
   * @param asset The address of the underlying asset of the reserve
   **/
  event ReserveUnfrozen(address indexed asset);
  /**
   * @dev Emitted when a reserve factor is updated
   * @param asset The address of the underlying asset of the reserve
   * @param factor The new reserve factor
   **/
  event ReserveFactorChanged(address indexed asset, uint256 factor);
  /**
   * @dev Emitted when the reserve decimals are updated
   * @param asset The address of the underlying asset of the reserve
   * @param decimals The new decimals
   **/
  event ReserveDecimalsChanged(address indexed asset, uint256 decimals);
  /**
   * @dev Emitted when a reserve interest strategy contract is updated
   * @param asset The address of the underlying asset of the reserve
   * @param strategy The new address of the interest strategy contract
   **/
  event ReserveInterestRateChanged(address indexed asset, address strategy);
  /**
   * @dev Emitted when a nft is initialized.
   * @param asset The address of the underlying asset of the nft
   * @param bNft The address of the associated bNFT contract
   **/
  event NftInitialized(address indexed asset, address indexed bNft);
  /**
   * @dev Emitted when the collateralization risk parameters for the specified NFT are updated.
   * @param asset The address of the underlying asset of the NFT
   * @param ltv The loan to value of the asset when used as NFT
   * @param liquidationThreshold The threshold at which loans using this asset as NFT will be considered undercollateralized
   * @param liquidationBonus The bonus liquidators receive to liquidate this asset
   **/
  event NftConfigurationChanged(
    address indexed asset,
    uint256 ltv,
    uint256 liquidationThreshold,
    uint256 liquidationBonus
  );
  /**
   * @dev Emitted when a NFT is activated
   * @param asset The address of the underlying asset of the NFT
   **/
  event NftActivated(address indexed asset);
  /**
   * @dev Emitted when a NFT is deactivated
   * @param asset The address of the underlying asset of the NFT
   **/
  event NftDeactivated(address indexed asset);
  /**
   * @dev Emitted when a NFT is frozen
   * @param asset The address of the underlying asset of the NFT
   **/
  event NftFrozen(address indexed asset);
  /**
   * @dev Emitted when a NFT is unfrozen
   * @param asset The address of the underlying asset of the NFT
   **/
  event NftUnfrozen(address indexed asset);
  /**
   * @dev Emitted when a redeem duration is updated
   * @param asset The address of the underlying asset of the NFT
   * @param redeemDuration The new redeem duration
   * @param auctionDuration The new redeem duration
   * @param redeemFine The new redeem fine
   **/
  event NftAuctionChanged(address indexed asset, uint256 redeemDuration, uint256 auctionDuration, uint256 redeemFine);
  event NftRedeemThresholdChanged(address indexed asset, uint256 redeemThreshold);
  /**
   * @dev Emitted when an bToken implementation is upgraded
   * @param asset The address of the underlying asset of the reserve
   * @param proxy The bToken proxy address
   * @param implementation The new bToken implementation
   **/
  event BTokenUpgraded(address indexed asset, address indexed proxy, address indexed implementation);
  /**
   * @dev Emitted when the implementation of a debt token is upgraded
   * @param asset The address of the underlying asset of the reserve
   * @param proxy The debt token proxy address
   * @param implementation The new debtToken implementation
   **/
  event DebtTokenUpgraded(address indexed asset, address indexed proxy, address indexed implementation);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ILendPoolAddressesProvider} from "./ILendPoolAddressesProvider.sol";
import {DataTypes} from "../libraries/types/DataTypes.sol";
interface ILendPool {
  /**
   * @dev Emitted on deposit()
   * @param user The address initiating the deposit
   * @param amount The amount deposited
   * @param reserve The address of the underlying asset of the reserve
   * @param onBehalfOf The beneficiary of the deposit, receiving the bTokens
   * @param referral The referral code used
   **/
  event Deposit(
    address user,
    address indexed reserve,
    uint256 amount,
    address indexed onBehalfOf,
    uint16 indexed referral
  );
  /**
   * @dev Emitted on withdraw()
   * @param user The address initiating the withdrawal, owner of bTokens
   * @param reserve The address of the underlyng asset being withdrawn
   * @param amount The amount to be withdrawn
   * @param to Address that will receive the underlying
   **/
  event Withdraw(address indexed user, address indexed reserve, uint256 amount, address indexed to);
  /**
   * @dev Emitted on borrow() when loan needs to be opened
   * @param user The address of the user initiating the borrow(), receiving the funds
   * @param reserve The address of the underlying asset being borrowed
   * @param amount The amount borrowed out
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param onBehalfOf The address that will be getting the loan
   * @param referral The referral code used
   **/
  event Borrow(
    address user,
    address indexed reserve,
    uint256 amount,
    address nftAsset,
    uint256 nftTokenId,
    address indexed onBehalfOf,
    uint256 borrowRate,
    uint256 loanId,
    uint16 indexed referral
  );
  /**
   * @dev Emitted on repay()
   * @param user The address of the user initiating the repay(), providing the funds
   * @param reserve The address of the underlying asset of the reserve
   * @param amount The amount repaid
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param borrower The beneficiary of the repayment, getting his debt reduced
   * @param loanId The loan ID of the NFT loans
   **/
  event Repay(
    address user,
    address indexed reserve,
    uint256 amount,
    address indexed nftAsset,
    uint256 nftTokenId,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted when a borrower's loan is auctioned.
   * @param user The address of the user initiating the auction
   * @param reserve The address of the underlying asset of the reserve
   * @param bidPrice The price of the underlying reserve given by the bidder
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param onBehalfOf The address that will be getting the NFT
   * @param loanId The loan ID of the NFT loans
   **/
  event Auction(
    address user,
    address indexed reserve,
    uint256 bidPrice,
    address indexed nftAsset,
    uint256 nftTokenId,
    address onBehalfOf,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted on redeem()
   * @param user The address of the user initiating the redeem(), providing the funds
   * @param reserve The address of the underlying asset of the reserve
   * @param borrowAmount The borrow amount repaid
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param loanId The loan ID of the NFT loans
   **/
  event Redeem(
    address user,
    address indexed reserve,
    uint256 borrowAmount,
    uint256 fineAmount,
    address indexed nftAsset,
    uint256 nftTokenId,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted when a borrower's loan is liquidated.
   * @param user The address of the user initiating the auction
   * @param reserve The address of the underlying asset of the reserve
   * @param repayAmount The amount of reserve repaid by the liquidator
   * @param remainAmount The amount of reserve received by the borrower
   * @param loanId The loan ID of the NFT loans
   **/
  event Liquidate(
    address user,
    address indexed reserve,
    uint256 repayAmount,
    uint256 remainAmount,
    address indexed nftAsset,
    uint256 nftTokenId,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted when the pause is triggered.
   */
  event Paused();
  /**
   * @dev Emitted when the pause is lifted.
   */
  event Unpaused();
  /**
   * @dev Emitted when the state of a reserve is updated. NOTE: This event is actually declared
   * in the ReserveLogic library and emitted in the updateInterestRates() function. Since the function is internal,
   * the event will actually be fired by the LendPool contract. The event is therefore replicated here so it
   * gets added to the LendPool ABI
   * @param reserve The address of the underlying asset of the reserve
   * @param liquidityRate The new liquidity rate
   * @param variableBorrowRate The new variable borrow rate
   * @param liquidityIndex The new liquidity index
   * @param variableBorrowIndex The new variable borrow index
   **/
  event ReserveDataUpdated(
    address indexed reserve,
    uint256 liquidityRate,
    uint256 variableBorrowRate,
    uint256 liquidityIndex,
    uint256 variableBorrowIndex
  );
  /**
   * @dev Deposits an `amount` of underlying asset into the reserve, receiving in return overlying bTokens.
   * - E.g. User deposits 100 USDC and gets in return 100 bUSDC
   * @param reserve The address of the underlying asset to deposit
   * @param amount The amount to be deposited
   * @param onBehalfOf The address that will receive the bTokens, same as msg.sender if the user
   *   wants to receive them on his own wallet, or a different address if the beneficiary of bTokens
   *   is a different wallet
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   **/
  function deposit(
    address reserve,
    uint256 amount,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  /**
   * @dev Withdraws an `amount` of underlying asset from the reserve, burning the equivalent bTokens owned
   * E.g. User has 100 bUSDC, calls withdraw() and receives 100 USDC, burning the 100 bUSDC
   * @param reserve The address of the underlying asset to withdraw
   * @param amount The underlying amount to be withdrawn
   *   - Send the value type(uint256).max in order to withdraw the whole bToken balance
   * @param to Address that will receive the underlying, same as msg.sender if the user
   *   wants to receive it on his own wallet, or a different address if the beneficiary is a
   *   different wallet
   * @return The final amount withdrawn
   **/
  function withdraw(
    address reserve,
    uint256 amount,
    address to
  ) external returns (uint256);
  /**
   * @dev Allows users to borrow a specific `amount` of the reserve underlying asset, provided that the borrower
   * already deposited enough collateral
   * - E.g. User borrows 100 USDC, receiving the 100 USDC in his wallet
   *   and lock collateral asset in contract
   * @param reserveAsset The address of the underlying asset to borrow
   * @param amount The amount to be borrowed
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param onBehalfOf Address of the user who will receive the loan. Should be the address of the borrower itself
   * calling the function if he wants to borrow against his own collateral, or the address of the credit delegator
   * if he has been given credit delegation allowance
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   **/
  function borrow(
    address reserveAsset,
    uint256 amount,
    address nftAsset,
    uint256 nftTokenId,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  function batchBorrow(
    address[] calldata assets,
    uint256[] calldata amounts,
    address[] calldata nftAssets,
    uint256[] calldata nftTokenIds,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  /**
   * @notice Repays a borrowed `amount` on a specific reserve, burning the equivalent loan owned
   * - E.g. User repays 100 USDC, burning loan and receives collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param amount The amount to repay
   * @return The final amount repaid, loan is burned or not
   **/
  function repay(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount
  ) external returns (uint256, bool);
  function batchRepay(
    address[] calldata nftAssets,
    uint256[] calldata nftTokenIds,
    uint256[] calldata amounts
  ) external returns (uint256[] memory, bool[] memory);
  /**
   * @dev Function to auction a non-healthy position collateral-wise
   * - The caller (liquidator) want to buy collateral asset of the user getting liquidated
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param bidPrice The bid price of the liquidator want to buy the underlying NFT
   * @param onBehalfOf Address of the user who will get the underlying NFT, same as msg.sender if the user
   *   wants to receive them on his own wallet, or a different address if the beneficiary of NFT
   *   is a different wallet
   **/
  function auction(
    address nftAsset,
    uint256 nftTokenId,
    uint256 bidPrice,
    address onBehalfOf
  ) external;
  /**
   * @notice Redeem a NFT loan which state is in Auction
   * - E.g. User repays 100 USDC, burning loan and receives collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param amount The amount to repay the debt
   * @param bidFine The amount of bid fine
   **/
  function redeem(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount,
    uint256 bidFine
  ) external returns (uint256);
  /**
   * @dev Function to liquidate a non-healthy position collateral-wise
   * - The caller (liquidator) buy collateral asset of the user getting liquidated, and receives
   *   the collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   **/
  function liquidate(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount
  ) external returns (uint256);
  /**
   * @dev Validates and finalizes an bToken transfer
   * - Only callable by the overlying bToken of the `asset`
   * @param asset The address of the underlying asset of the bToken
   * @param from The user from which the bTokens are transferred
   * @param to The user receiving the bTokens
   * @param amount The amount being transferred/withdrawn
   * @param balanceFromBefore The bToken balance of the `from` user before the transfer
   * @param balanceToBefore The bToken balance of the `to` user before the transfer
   */
  function finalizeTransfer(
    address asset,
    address from,
    address to,
    uint256 amount,
    uint256 balanceFromBefore,
    uint256 balanceToBefore
  ) external view;
  function getReserveConfiguration(address asset) external view returns (DataTypes.ReserveConfigurationMap memory);
  function getNftConfiguration(address asset) external view returns (DataTypes.NftConfigurationMap memory);
  /**
   * @dev Returns the normalized income normalized income of the reserve
   * @param asset The address of the underlying asset of the reserve
   * @return The reserve's normalized income
   */
  function getReserveNormalizedIncome(address asset) external view returns (uint256);
  /**
   * @dev Returns the normalized variable debt per unit of asset
   * @param asset The address of the underlying asset of the reserve
   * @return The reserve normalized variable debt
   */
  function getReserveNormalizedVariableDebt(address asset) external view returns (uint256);
  /**
   * @dev Returns the state and configuration of the reserve
   * @param asset The address of the underlying asset of the reserve
   * @return The state of the reserve
   **/
  function getReserveData(address asset) external view returns (DataTypes.ReserveData memory);
  function getReservesList() external view returns (address[] memory);
  function getNftData(address asset) external view returns (DataTypes.NftData memory);
  /**
   * @dev Returns the loan data of the NFT
   * @param nftAsset The address of the NFT
   * @param reserveAsset The address of the Reserve
   * @return totalCollateralInETH the total collateral in ETH of the NFT
   * @return totalCollateralInReserve the total collateral in Reserve of the NFT
   * @return availableBorrowsInETH the borrowing power in ETH of the NFT
   * @return availableBorrowsInReserve the borrowing power in Reserve of the NFT
   * @return ltv the loan to value of the user
   * @return liquidationThreshold the liquidation threshold of the NFT
   * @return liquidationBonus the liquidation bonus of the NFT
   **/
  function getNftCollateralData(address nftAsset, address reserveAsset)
    external
    view
    returns (
      uint256 totalCollateralInETH,
      uint256 totalCollateralInReserve,
      uint256 availableBorrowsInETH,
      uint256 availableBorrowsInReserve,
      uint256 ltv,
      uint256 liquidationThreshold,
      uint256 liquidationBonus
    );
  /**
   * @dev Returns the debt data of the NFT
   * @param nftAsset The address of the NFT
   * @param nftTokenId The token id of the NFT
   * @return loanId the loan id of the NFT
   * @return reserveAsset the address of the Reserve
   * @return totalCollateral the total power of the NFT
   * @return totalDebt the total debt of the NFT
   * @return availableBorrows the borrowing power left of the NFT
   * @return healthFactor the current health factor of the NFT
   **/
  function getNftDebtData(address nftAsset, uint256 nftTokenId)
    external
    view
    returns (
      uint256 loanId,
      address reserveAsset,
      uint256 totalCollateral,
      uint256 totalDebt,
      uint256 availableBorrows,
      uint256 healthFactor
    );
  /**
   * @dev Returns the auction data of the NFT
   * @param nftAsset The address of the NFT
   * @param nftTokenId The token id of the NFT
   * @return loanId the loan id of the NFT
   * @return bidderAddress the highest bidder address of the loan
   * @return bidPrice the highest bid price in Reserve of the loan
   * @return bidBorrowAmount the borrow amount in Reserve of the loan
   * @return bidFine the penalty fine of the loan
   **/
  function getNftAuctionData(address nftAsset, uint256 nftTokenId)
    external
    view
    returns (
      uint256 loanId,
      address bidderAddress,
      uint256 bidPrice,
      uint256 bidBorrowAmount,
      uint256 bidFine
    );
  function getNftLiquidatePrice(address nftAsset, uint256 nftTokenId)
    external
    view
    returns (uint256 liquidatePrice, uint256 paybackAmount);
  function getNftsList() external view returns (address[] memory);
  /**
   * @dev Set the _pause state of a reserve
   * - Only callable by the LendPool contract
   * @param val `true` to pause the reserve, `false` to un-pause it
   */
  function setPause(bool val) external;
  /**
   * @dev Returns if the LendPool is paused
   */
  function paused() external view returns (bool);
  function getAddressesProvider() external view returns (ILendPoolAddressesProvider);
  function initReserve(
    address asset,
    address bTokenAddress,
    address debtTokenAddress,
    address interestRateAddress
  ) external;
  function initNft(address asset, address bNftAddress) external;
  function setReserveInterestRateAddress(address asset, address rateAddress) external;
  function setReserveConfiguration(address asset, uint256 configuration) external;
  function setNftConfiguration(address asset, uint256 configuration) external;
  function setMaxNumberOfReserves(uint256 val) external;
  function setMaxNumberOfNfts(uint256 val) external;
  function getMaxNumberOfReserves() external view returns (uint256);
  function getMaxNumberOfNfts() external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
/**
 * @title ReserveConfiguration library
 * @author Bend
 * @notice Implements the bitmap logic to handle the reserve configuration
 */
library ReserveConfiguration {
  uint256 constant LTV_MASK =                   0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000; // prettier-ignore
  uint256 constant LIQUIDATION_THRESHOLD_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFF; // prettier-ignore
  uint256 constant LIQUIDATION_BONUS_MASK =     0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFF; // prettier-ignore
  uint256 constant DECIMALS_MASK =              0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00FFFFFFFFFFFF; // prettier-ignore
  uint256 constant ACTIVE_MASK =                0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant FROZEN_MASK =                0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFDFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant BORROWING_MASK =             0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFBFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant STABLE_BORROWING_MASK =      0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7FFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant RESERVE_FACTOR_MASK =        0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFFFFFFFFFF; // prettier-ignore
  /// @dev For the LTV, the start bit is 0 (up to 15), hence no bitshifting is needed
  uint256 constant LIQUIDATION_THRESHOLD_START_BIT_POSITION = 16;
  uint256 constant LIQUIDATION_BONUS_START_BIT_POSITION = 32;
  uint256 constant RESERVE_DECIMALS_START_BIT_POSITION = 48;
  uint256 constant IS_ACTIVE_START_BIT_POSITION = 56;
  uint256 constant IS_FROZEN_START_BIT_POSITION = 57;
  uint256 constant BORROWING_ENABLED_START_BIT_POSITION = 58;
  uint256 constant STABLE_BORROWING_ENABLED_START_BIT_POSITION = 59;
  uint256 constant RESERVE_FACTOR_START_BIT_POSITION = 64;
  uint256 constant MAX_VALID_LTV = 65535;
  uint256 constant MAX_VALID_LIQUIDATION_THRESHOLD = 65535;
  uint256 constant MAX_VALID_LIQUIDATION_BONUS = 65535;
  uint256 constant MAX_VALID_DECIMALS = 255;
  uint256 constant MAX_VALID_RESERVE_FACTOR = 65535;
  /**
   * @dev Sets the Loan to Value of the reserve
   * @param self The reserve configuration
   * @param ltv the new ltv
   **/
  function setLtv(DataTypes.ReserveConfigurationMap memory self, uint256 ltv) internal pure {
    require(ltv <= MAX_VALID_LTV, Errors.RC_INVALID_LTV);
    self.data = (self.data & LTV_MASK) | ltv;
  }
  /**
   * @dev Gets the Loan to Value of the reserve
   * @param self The reserve configuration
   * @return The loan to value
   **/
  function getLtv(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) {
    return self.data & ~LTV_MASK;
  }
  /**
   * @dev Sets the liquidation threshold of the reserve
   * @param self The reserve configuration
   * @param threshold The new liquidation threshold
   **/
  function setLiquidationThreshold(DataTypes.ReserveConfigurationMap memory self, uint256 threshold) internal pure {
    require(threshold <= MAX_VALID_LIQUIDATION_THRESHOLD, Errors.RC_INVALID_LIQ_THRESHOLD);
    self.data = (self.data & LIQUIDATION_THRESHOLD_MASK) | (threshold << LIQUIDATION_THRESHOLD_START_BIT_POSITION);
  }
  /**
   * @dev Gets the liquidation threshold of the reserve
   * @param self The reserve configuration
   * @return The liquidation threshold
   **/
  function getLiquidationThreshold(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION;
  }
  /**
   * @dev Sets the liquidation bonus of the reserve
   * @param self The reserve configuration
   * @param bonus The new liquidation bonus
   **/
  function setLiquidationBonus(DataTypes.ReserveConfigurationMap memory self, uint256 bonus) internal pure {
    require(bonus <= MAX_VALID_LIQUIDATION_BONUS, Errors.RC_INVALID_LIQ_BONUS);
    self.data = (self.data & LIQUIDATION_BONUS_MASK) | (bonus << LIQUIDATION_BONUS_START_BIT_POSITION);
  }
  /**
   * @dev Gets the liquidation bonus of the reserve
   * @param self The reserve configuration
   * @return The liquidation bonus
   **/
  function getLiquidationBonus(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION;
  }
  /**
   * @dev Sets the decimals of the underlying asset of the reserve
   * @param self The reserve configuration
   * @param decimals The decimals
   **/
  function setDecimals(DataTypes.ReserveConfigurationMap memory self, uint256 decimals) internal pure {
    require(decimals <= MAX_VALID_DECIMALS, Errors.RC_INVALID_DECIMALS);
    self.data = (self.data & DECIMALS_MASK) | (decimals << RESERVE_DECIMALS_START_BIT_POSITION);
  }
  /**
   * @dev Gets the decimals of the underlying asset of the reserve
   * @param self The reserve configuration
   * @return The decimals of the asset
   **/
  function getDecimals(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION;
  }
  /**
   * @dev Sets the active state of the reserve
   * @param self The reserve configuration
   * @param active The active state
   **/
  function setActive(DataTypes.ReserveConfigurationMap memory self, bool active) internal pure {
    self.data = (self.data & ACTIVE_MASK) | (uint256(active ? 1 : 0) << IS_ACTIVE_START_BIT_POSITION);
  }
  /**
   * @dev Gets the active state of the reserve
   * @param self The reserve configuration
   * @return The active state
   **/
  function getActive(DataTypes.ReserveConfigurationMap storage self) internal view returns (bool) {
    return (self.data & ~ACTIVE_MASK) != 0;
  }
  /**
   * @dev Sets the frozen state of the reserve
   * @param self The reserve configuration
   * @param frozen The frozen state
   **/
  function setFrozen(DataTypes.ReserveConfigurationMap memory self, bool frozen) internal pure {
    self.data = (self.data & FROZEN_MASK) | (uint256(frozen ? 1 : 0) << IS_FROZEN_START_BIT_POSITION);
  }
  /**
   * @dev Gets the frozen state of the reserve
   * @param self The reserve configuration
   * @return The frozen state
   **/
  function getFrozen(DataTypes.ReserveConfigurationMap storage self) internal view returns (bool) {
    return (self.data & ~FROZEN_MASK) != 0;
  }
  /**
   * @dev Enables or disables borrowing on the reserve
   * @param self The reserve configuration
   * @param enabled True if the borrowing needs to be enabled, false otherwise
   **/
  function setBorrowingEnabled(DataTypes.ReserveConfigurationMap memory self, bool enabled) internal pure {
    self.data = (self.data & BORROWING_MASK) | (uint256(enabled ? 1 : 0) << BORROWING_ENABLED_START_BIT_POSITION);
  }
  /**
   * @dev Gets the borrowing state of the reserve
   * @param self The reserve configuration
   * @return The borrowing state
   **/
  function getBorrowingEnabled(DataTypes.ReserveConfigurationMap storage self) internal view returns (bool) {
    return (self.data & ~BORROWING_MASK) != 0;
  }
  /**
   * @dev Enables or disables stable rate borrowing on the reserve
   * @param self The reserve configuration
   * @param enabled True if the stable rate borrowing needs to be enabled, false otherwise
   **/
  function setStableRateBorrowingEnabled(DataTypes.ReserveConfigurationMap memory self, bool enabled) internal pure {
    self.data =
      (self.data & STABLE_BORROWING_MASK) |
      (uint256(enabled ? 1 : 0) << STABLE_BORROWING_ENABLED_START_BIT_POSITION);
  }
  /**
   * @dev Gets the stable rate borrowing state of the reserve
   * @param self The reserve configuration
   * @return The stable rate borrowing state
   **/
  function getStableRateBorrowingEnabled(DataTypes.ReserveConfigurationMap storage self) internal view returns (bool) {
    return (self.data & ~STABLE_BORROWING_MASK) != 0;
  }
  /**
   * @dev Sets the reserve factor of the reserve
   * @param self The reserve configuration
   * @param reserveFactor The reserve factor
   **/
  function setReserveFactor(DataTypes.ReserveConfigurationMap memory self, uint256 reserveFactor) internal pure {
    require(reserveFactor <= MAX_VALID_RESERVE_FACTOR, Errors.RC_INVALID_RESERVE_FACTOR);
    self.data = (self.data & RESERVE_FACTOR_MASK) | (reserveFactor << RESERVE_FACTOR_START_BIT_POSITION);
  }
  /**
   * @dev Gets the reserve factor of the reserve
   * @param self The reserve configuration
   * @return The reserve factor
   **/
  function getReserveFactor(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~RESERVE_FACTOR_MASK) >> RESERVE_FACTOR_START_BIT_POSITION;
  }
  /**
   * @dev Gets the configuration flags of the reserve
   * @param self The reserve configuration
   * @return The state flags representing active, frozen, borrowing enabled, stableRateBorrowing enabled
   **/
  function getFlags(DataTypes.ReserveConfigurationMap storage self)
    internal
    view
    returns (
      bool,
      bool,
      bool,
      bool
    )
  {
    uint256 dataLocal = self.data;
    return (
      (dataLocal & ~ACTIVE_MASK) != 0,
      (dataLocal & ~FROZEN_MASK) != 0,
      (dataLocal & ~BORROWING_MASK) != 0,
      (dataLocal & ~STABLE_BORROWING_MASK) != 0
    );
  }
  /**
   * @dev Gets the configuration paramters of the reserve
   * @param self The reserve configuration
   * @return The state params representing ltv, liquidation threshold, liquidation bonus, the reserve decimals
   **/
  function getParams(DataTypes.ReserveConfigurationMap storage self)
    internal
    view
    returns (
      uint256,
      uint256,
      uint256,
      uint256,
      uint256
    )
  {
    uint256 dataLocal = self.data;
    return (
      dataLocal & ~LTV_MASK,
      (dataLocal & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION,
      (dataLocal & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION,
      (dataLocal & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION,
      (dataLocal & ~RESERVE_FACTOR_MASK) >> RESERVE_FACTOR_START_BIT_POSITION
    );
  }
  /**
   * @dev Gets the configuration paramters of the reserve from a memory object
   * @param self The reserve configuration
   * @return The state params representing ltv, liquidation threshold, liquidation bonus, the reserve decimals
   **/
  function getParamsMemory(DataTypes.ReserveConfigurationMap memory self)
    internal
    pure
    returns (
      uint256,
      uint256,
      uint256,
      uint256,
      uint256
    )
  {
    return (
      self.data & ~LTV_MASK,
      (self.data & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION,
      (self.data & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION,
      (self.data & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION,
      (self.data & ~RESERVE_FACTOR_MASK) >> RESERVE_FACTOR_START_BIT_POSITION
    );
  }
  /**
   * @dev Gets the configuration flags of the reserve from a memory object
   * @param self The reserve configuration
   * @return The state flags representing active, frozen, borrowing enabled, stableRateBorrowing enabled
   **/
  function getFlagsMemory(DataTypes.ReserveConfigurationMap memory self)
    internal
    pure
    returns (
      bool,
      bool,
      bool,
      bool
    )
  {
    return (
      (self.data & ~ACTIVE_MASK) != 0,
      (self.data & ~FROZEN_MASK) != 0,
      (self.data & ~BORROWING_MASK) != 0,
      (self.data & ~STABLE_BORROWING_MASK) != 0
    );
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
/**
 * @title NftConfiguration library
 * @author Bend
 * @notice Implements the bitmap logic to handle the NFT configuration
 */
library NftConfiguration {
  uint256 constant LTV_MASK =                   0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000; // prettier-ignore
  uint256 constant LIQUIDATION_THRESHOLD_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFF; // prettier-ignore
  uint256 constant LIQUIDATION_BONUS_MASK =     0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFF; // prettier-ignore
  uint256 constant ACTIVE_MASK =                0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant FROZEN_MASK =                0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFDFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant REDEEM_DURATION_MASK =       0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00FFFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant AUCTION_DURATION_MASK =      0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00FFFFFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant REDEEM_FINE_MASK =           0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant REDEEM_THRESHOLD_MASK =      0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFFFFFFFFFFFFFFFFFF; // prettier-ignore
  /// @dev For the LTV, the start bit is 0 (up to 15), hence no bitshifting is needed
  uint256 constant LIQUIDATION_THRESHOLD_START_BIT_POSITION = 16;
  uint256 constant LIQUIDATION_BONUS_START_BIT_POSITION = 32;
  uint256 constant IS_ACTIVE_START_BIT_POSITION = 56;
  uint256 constant IS_FROZEN_START_BIT_POSITION = 57;
  uint256 constant REDEEM_DURATION_START_BIT_POSITION = 64;
  uint256 constant AUCTION_DURATION_START_BIT_POSITION = 72;
  uint256 constant REDEEM_FINE_START_BIT_POSITION = 80;
  uint256 constant REDEEM_THRESHOLD_START_BIT_POSITION = 96;
  uint256 constant MAX_VALID_LTV = 65535;
  uint256 constant MAX_VALID_LIQUIDATION_THRESHOLD = 65535;
  uint256 constant MAX_VALID_LIQUIDATION_BONUS = 65535;
  uint256 constant MAX_VALID_REDEEM_DURATION = 255;
  uint256 constant MAX_VALID_AUCTION_DURATION = 255;
  uint256 constant MAX_VALID_REDEEM_FINE = 65535;
  uint256 constant MAX_VALID_REDEEM_THRESHOLD = 65535;
  /**
   * @dev Sets the Loan to Value of the NFT
   * @param self The NFT configuration
   * @param ltv the new ltv
   **/
  function setLtv(DataTypes.NftConfigurationMap memory self, uint256 ltv) internal pure {
    require(ltv <= MAX_VALID_LTV, Errors.RC_INVALID_LTV);
    self.data = (self.data & LTV_MASK) | ltv;
  }
  /**
   * @dev Gets the Loan to Value of the NFT
   * @param self The NFT configuration
   * @return The loan to value
   **/
  function getLtv(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return self.data & ~LTV_MASK;
  }
  /**
   * @dev Sets the liquidation threshold of the NFT
   * @param self The NFT configuration
   * @param threshold The new liquidation threshold
   **/
  function setLiquidationThreshold(DataTypes.NftConfigurationMap memory self, uint256 threshold) internal pure {
    require(threshold <= MAX_VALID_LIQUIDATION_THRESHOLD, Errors.RC_INVALID_LIQ_THRESHOLD);
    self.data = (self.data & LIQUIDATION_THRESHOLD_MASK) | (threshold << LIQUIDATION_THRESHOLD_START_BIT_POSITION);
  }
  /**
   * @dev Gets the liquidation threshold of the NFT
   * @param self The NFT configuration
   * @return The liquidation threshold
   **/
  function getLiquidationThreshold(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION;
  }
  /**
   * @dev Sets the liquidation bonus of the NFT
   * @param self The NFT configuration
   * @param bonus The new liquidation bonus
   **/
  function setLiquidationBonus(DataTypes.NftConfigurationMap memory self, uint256 bonus) internal pure {
    require(bonus <= MAX_VALID_LIQUIDATION_BONUS, Errors.RC_INVALID_LIQ_BONUS);
    self.data = (self.data & LIQUIDATION_BONUS_MASK) | (bonus << LIQUIDATION_BONUS_START_BIT_POSITION);
  }
  /**
   * @dev Gets the liquidation bonus of the NFT
   * @param self The NFT configuration
   * @return The liquidation bonus
   **/
  function getLiquidationBonus(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION;
  }
  /**
   * @dev Sets the active state of the NFT
   * @param self The NFT configuration
   * @param active The active state
   **/
  function setActive(DataTypes.NftConfigurationMap memory self, bool active) internal pure {
    self.data = (self.data & ACTIVE_MASK) | (uint256(active ? 1 : 0) << IS_ACTIVE_START_BIT_POSITION);
  }
  /**
   * @dev Gets the active state of the NFT
   * @param self The NFT configuration
   * @return The active state
   **/
  function getActive(DataTypes.NftConfigurationMap storage self) internal view returns (bool) {
    return (self.data & ~ACTIVE_MASK) != 0;
  }
  /**
   * @dev Sets the frozen state of the NFT
   * @param self The NFT configuration
   * @param frozen The frozen state
   **/
  function setFrozen(DataTypes.NftConfigurationMap memory self, bool frozen) internal pure {
    self.data = (self.data & FROZEN_MASK) | (uint256(frozen ? 1 : 0) << IS_FROZEN_START_BIT_POSITION);
  }
  /**
   * @dev Gets the frozen state of the NFT
   * @param self The NFT configuration
   * @return The frozen state
   **/
  function getFrozen(DataTypes.NftConfigurationMap storage self) internal view returns (bool) {
    return (self.data & ~FROZEN_MASK) != 0;
  }
  /**
   * @dev Sets the redeem duration of the NFT
   * @param self The NFT configuration
   * @param redeemDuration The redeem duration
   **/
  function setRedeemDuration(DataTypes.NftConfigurationMap memory self, uint256 redeemDuration) internal pure {
    require(redeemDuration <= MAX_VALID_REDEEM_DURATION, Errors.RC_INVALID_REDEEM_DURATION);
    self.data = (self.data & REDEEM_DURATION_MASK) | (redeemDuration << REDEEM_DURATION_START_BIT_POSITION);
  }
  /**
   * @dev Gets the redeem duration of the NFT
   * @param self The NFT configuration
   * @return The redeem duration
   **/
  function getRedeemDuration(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~REDEEM_DURATION_MASK) >> REDEEM_DURATION_START_BIT_POSITION;
  }
  /**
   * @dev Sets the auction duration of the NFT
   * @param self The NFT configuration
   * @param auctionDuration The auction duration
   **/
  function setAuctionDuration(DataTypes.NftConfigurationMap memory self, uint256 auctionDuration) internal pure {
    require(auctionDuration <= MAX_VALID_AUCTION_DURATION, Errors.RC_INVALID_AUCTION_DURATION);
    self.data = (self.data & AUCTION_DURATION_MASK) | (auctionDuration << AUCTION_DURATION_START_BIT_POSITION);
  }
  /**
   * @dev Gets the auction duration of the NFT
   * @param self The NFT configuration
   * @return The auction duration
   **/
  function getAuctionDuration(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~AUCTION_DURATION_MASK) >> AUCTION_DURATION_START_BIT_POSITION;
  }
  /**
   * @dev Sets the redeem fine of the NFT
   * @param self The NFT configuration
   * @param redeemFine The redeem duration
   **/
  function setRedeemFine(DataTypes.NftConfigurationMap memory self, uint256 redeemFine) internal pure {
    require(redeemFine <= MAX_VALID_REDEEM_FINE, Errors.RC_INVALID_REDEEM_FINE);
    self.data = (self.data & REDEEM_FINE_MASK) | (redeemFine << REDEEM_FINE_START_BIT_POSITION);
  }
  /**
   * @dev Gets the redeem fine of the NFT
   * @param self The NFT configuration
   * @return The redeem fine
   **/
  function getRedeemFine(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~REDEEM_FINE_MASK) >> REDEEM_FINE_START_BIT_POSITION;
  }
  /**
   * @dev Sets the redeem threshold of the NFT
   * @param self The NFT configuration
   * @param redeemThreshold The redeem duration
   **/
  function setRedeemThreshold(DataTypes.NftConfigurationMap memory self, uint256 redeemThreshold) internal pure {
    require(redeemThreshold <= MAX_VALID_REDEEM_THRESHOLD, Errors.RC_INVALID_REDEEM_THRESHOLD);
    self.data = (self.data & REDEEM_THRESHOLD_MASK) | (redeemThreshold << REDEEM_THRESHOLD_START_BIT_POSITION);
  }
  /**
   * @dev Gets the redeem threshold of the NFT
   * @param self The NFT configuration
   * @return The redeem threshold
   **/
  function getRedeemThreshold(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~REDEEM_THRESHOLD_MASK) >> REDEEM_THRESHOLD_START_BIT_POSITION;
  }
  /**
   * @dev Gets the configuration flags of the NFT
   * @param self The NFT configuration
   * @return The state flags representing active, frozen
   **/
  function getFlags(DataTypes.NftConfigurationMap storage self) internal view returns (bool, bool) {
    uint256 dataLocal = self.data;
    return ((dataLocal & ~ACTIVE_MASK) != 0, (dataLocal & ~FROZEN_MASK) != 0);
  }
  /**
   * @dev Gets the configuration flags of the NFT from a memory object
   * @param self The NFT configuration
   * @return The state flags representing active, frozen
   **/
  function getFlagsMemory(DataTypes.NftConfigurationMap memory self) internal pure returns (bool, bool) {
    return ((self.data & ~ACTIVE_MASK) != 0, (self.data & ~FROZEN_MASK) != 0);
  }
  /**
   * @dev Gets the collateral configuration paramters of the NFT
   * @param self The NFT configuration
   * @return The state params representing ltv, liquidation threshold, liquidation bonus
   **/
  function getCollateralParams(DataTypes.NftConfigurationMap storage self)
    internal
    view
    returns (
      uint256,
      uint256,
      uint256
    )
  {
    uint256 dataLocal = self.data;
    return (
      dataLocal & ~LTV_MASK,
      (dataLocal & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION,
      (dataLocal & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION
    );
  }
  /**
   * @dev Gets the auction configuration paramters of the NFT
   * @param self The NFT configuration
   * @return The state params representing redeem duration, auction duration, redeem fine
   **/
  function getAuctionParams(DataTypes.NftConfigurationMap storage self)
    internal
    view
    returns (
      uint256,
      uint256,
      uint256,
      uint256
    )
  {
    uint256 dataLocal = self.data;
    return (
      (dataLocal & ~REDEEM_DURATION_MASK) >> REDEEM_DURATION_START_BIT_POSITION,
      (dataLocal & ~AUCTION_DURATION_MASK) >> AUCTION_DURATION_START_BIT_POSITION,
      (dataLocal & ~REDEEM_FINE_MASK) >> REDEEM_FINE_START_BIT_POSITION,
      (dataLocal & ~REDEEM_THRESHOLD_MASK) >> REDEEM_THRESHOLD_START_BIT_POSITION
    );
  }
  /**
   * @dev Gets the collateral configuration paramters of the NFT from a memory object
   * @param self The NFT configuration
   * @return The state params representing ltv, liquidation threshold, liquidation bonus
   **/
  function getCollateralParamsMemory(DataTypes.NftConfigurationMap memory self)
    internal
    pure
    returns (
      uint256,
      uint256,
      uint256
    )
  {
    return (
      self.data & ~LTV_MASK,
      (self.data & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION,
      (self.data & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION
    );
  }
  /**
   * @dev Gets the auction configuration paramters of the NFT from a memory object
   * @param self The NFT configuration
   * @return The state params representing redeem duration, auction duration, redeem fine
   **/
  function getAuctionParamsMemory(DataTypes.NftConfigurationMap memory self)
    internal
    pure
    returns (
      uint256,
      uint256,
      uint256,
      uint256
    )
  {
    return (
      (self.data & ~REDEEM_DURATION_MASK) >> REDEEM_DURATION_START_BIT_POSITION,
      (self.data & ~AUCTION_DURATION_MASK) >> AUCTION_DURATION_START_BIT_POSITION,
      (self.data & ~REDEEM_FINE_MASK) >> REDEEM_FINE_START_BIT_POSITION,
      (self.data & ~REDEEM_THRESHOLD_MASK) >> REDEEM_THRESHOLD_START_BIT_POSITION
    );
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {Errors} from "../helpers/Errors.sol";
/**
 * @title PercentageMath library
 * @author Bend
 * @notice Provides functions to perform percentage calculations
 * @dev Percentages are defined by default with 2 decimals of precision (100.00). The precision is indicated by PERCENTAGE_FACTOR
 * @dev Operations are rounded half up
 **/
library PercentageMath {
  uint256 constant PERCENTAGE_FACTOR = 1e4; //percentage plus two decimals
  uint256 constant HALF_PERCENT = PERCENTAGE_FACTOR / 2;
  uint256 constant ONE_PERCENT = 1e2; //100, 1%
  uint256 constant TEN_PERCENT = 1e3; //1000, 10%
  uint256 constant ONE_THOUSANDTH_PERCENT = 1e1; //10, 0.1%
  uint256 constant ONE_TEN_THOUSANDTH_PERCENT = 1; //1, 0.01%
  /**
   * @dev Executes a percentage multiplication
   * @param value The value of which the percentage needs to be calculated
   * @param percentage The percentage of the value to be calculated
   * @return The percentage of value
   **/
  function percentMul(uint256 value, uint256 percentage) internal pure returns (uint256) {
    if (value == 0 || percentage == 0) {
      return 0;
    }
    require(value <= (type(uint256).max - HALF_PERCENT) / percentage, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (value * percentage + HALF_PERCENT) / PERCENTAGE_FACTOR;
  }
  /**
   * @dev Executes a percentage division
   * @param value The value of which the percentage needs to be calculated
   * @param percentage The percentage of the value to be calculated
   * @return The value divided the percentage
   **/
  function percentDiv(uint256 value, uint256 percentage) internal pure returns (uint256) {
    require(percentage != 0, Errors.MATH_DIVISION_BY_ZERO);
    uint256 halfPercentage = percentage / 2;
    require(value <= (type(uint256).max - halfPercentage) / PERCENTAGE_FACTOR, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (value * PERCENTAGE_FACTOR + halfPercentage) / percentage;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
library DataTypes {
  struct ReserveData {
    //stores the reserve configuration
    ReserveConfigurationMap configuration;
    //the liquidity index. Expressed in ray
    uint128 liquidityIndex;
    //variable borrow index. Expressed in ray
    uint128 variableBorrowIndex;
    //the current supply rate. Expressed in ray
    uint128 currentLiquidityRate;
    //the current variable borrow rate. Expressed in ray
    uint128 currentVariableBorrowRate;
    uint40 lastUpdateTimestamp;
    //tokens addresses
    address bTokenAddress;
    address debtTokenAddress;
    //address of the interest rate strategy
    address interestRateAddress;
    //the id of the reserve. Represents the position in the list of the active reserves
    uint8 id;
  }
  struct NftData {
    //stores the nft configuration
    NftConfigurationMap configuration;
    //address of the bNFT contract
    address bNftAddress;
    //the id of the nft. Represents the position in the list of the active nfts
    uint8 id;
  }
  struct ReserveConfigurationMap {
    //bit 0-15: LTV
    //bit 16-31: Liq. threshold
    //bit 32-47: Liq. bonus
    //bit 48-55: Decimals
    //bit 56: Reserve is active
    //bit 57: reserve is frozen
    //bit 58: borrowing is enabled
    //bit 59: stable rate borrowing enabled
    //bit 60-63: reserved
    //bit 64-79: reserve factor
    uint256 data;
  }
  struct NftConfigurationMap {
    //bit 0-15: LTV
    //bit 16-31: Liq. threshold
    //bit 32-47: Liq. bonus
    //bit 56: NFT is active
    //bit 57: NFT is frozen
    uint256 data;
  }
  /**
   * @dev Enum describing the current state of a loan
   * State change flow:
   *  Created -> Active -> Repaid
   *                    -> Auction -> Defaulted
   */
  enum LoanState {
    // We need a default that is not 'Created' - this is the zero value
    None,
    // The loan data is stored, but not initiated yet.
    Created,
    // The loan has been initialized, funds have been delivered to the borrower and the collateral is held.
    Active,
    // The loan is in auction, higest price liquidator will got chance to claim it.
    Auction,
    // The loan has been repaid, and the collateral has been returned to the borrower. This is a terminal state.
    Repaid,
    // The loan was delinquent and collateral claimed by the liquidator. This is a terminal state.
    Defaulted
  }
  struct LoanData {
    //the id of the nft loan
    uint256 loanId;
    //the current state of the loan
    LoanState state;
    //address of borrower
    address borrower;
    //address of nft asset token
    address nftAsset;
    //the id of nft token
    uint256 nftTokenId;
    //address of reserve asset token
    address reserveAsset;
    //scaled borrow amount. Expressed in ray
    uint256 scaledAmount;
    //start time of first bid time
    uint256 bidStartTimestamp;
    //bidder address of higest bid
    address bidderAddress;
    //price of higest bid
    uint256 bidPrice;
    //borrow amount of loan
    uint256 bidBorrowAmount;
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);
    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/utils/Initializable.sol)
pragma solidity ^0.8.0;
import "../../utils/AddressUpgradeable.sol";
/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To initialize the implementation contract, you can either invoke the
 * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() initializer {}
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;
    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;
    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, because in other contexts the
        // contract may have been reentered.
        require(_initializing ? _isConstructor() : !_initialized, "Initializable: contract is already initialized");
        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
        }
    }
    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} modifier, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }
    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
interface IScaledBalanceToken {
  /**
   * @dev Returns the scaled balance of the user. The scaled balance is the sum of all the
   * updated stored balance divided by the reserve's liquidity index at the moment of the update
   * @param user The user whose balance is calculated
   * @return The scaled balance of the user
   **/
  function scaledBalanceOf(address user) external view returns (uint256);
  /**
   * @dev Returns the scaled balance of the user and the scaled total supply.
   * @param user The address of the user
   * @return The scaled balance of the user
   * @return The scaled balance and the scaled total supply
   **/
  function getScaledUserBalanceAndSupply(address user) external view returns (uint256, uint256);
  /**
   * @dev Returns the scaled total supply of the variable debt token. Represents sum(debt/index)
   * @return The scaled total supply
   **/
  function scaledTotalSupply() external view returns (uint256);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)
pragma solidity ^0.8.0;
import "../IERC20Upgradeable.sol";
/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20MetadataUpgradeable is IERC20Upgradeable {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);
    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);
    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Enumerable.sol)
pragma solidity ^0.8.0;
import "../IERC721Upgradeable.sol";
/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721EnumerableUpgradeable is IERC721Upgradeable {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);
    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)
pragma solidity ^0.8.0;
import "../IERC721Upgradeable.sol";
/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721MetadataUpgradeable is IERC721Upgradeable {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);
    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);
    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)
pragma solidity ^0.8.0;
/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721ReceiverUpgradeable {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165Upgradeable.sol";
/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721Upgradeable is IERC165Upgradeable {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);
    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;
    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);
    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;
    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165Upgradeable {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)
pragma solidity ^0.8.0;
/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {Errors} from "../libraries/helpers/Errors.sol";
import {ILendPoolAddressesProviderRegistry} from "../interfaces/ILendPoolAddressesProviderRegistry.sol";
/**
 * @title LendPoolAddressesProviderRegistry contract
 * @dev Main registry of LendPoolAddressesProvider of multiple Bend protocol's markets
 * - Used for indexing purposes of Bend protocol's markets
 * - The id assigned to a LendPoolAddressesProvider refers to the market it is connected with,
 *   for example with `1` for the Bend main market and `2` for the next created
 * @author Bend
 **/
contract LendPoolAddressesProviderRegistry is Ownable, ILendPoolAddressesProviderRegistry {
  mapping(address => uint256) private _addressesProviders;
  address[] private _addressesProvidersList;
  /**
   * @dev Returns the list of registered addresses provider
   * @return The list of addresses provider, potentially containing address(0) elements
   **/
  function getAddressesProvidersList() external view override returns (address[] memory) {
    address[] memory addressesProvidersList = _addressesProvidersList;
    uint256 maxLength = addressesProvidersList.length;
    address[] memory activeProviders = new address[](maxLength);
    for (uint256 i = 0; i < maxLength; i++) {
      if (_addressesProviders[addressesProvidersList[i]] > 0) {
        activeProviders[i] = addressesProvidersList[i];
      }
    }
    return activeProviders;
  }
  /**
   * @dev Registers an addresses provider
   * @param provider The address of the new LendPoolAddressesProvider
   * @param id The id for the new LendPoolAddressesProvider, referring to the market it belongs to
   **/
  function registerAddressesProvider(address provider, uint256 id) external override onlyOwner {
    require(id != 0, Errors.LPAPR_INVALID_ADDRESSES_PROVIDER_ID);
    _addressesProviders[provider] = id;
    _addToAddressesProvidersList(provider);
    emit AddressesProviderRegistered(provider);
  }
  /**
   * @dev Removes a LendPoolAddressesProvider from the list of registered addresses provider
   * @param provider The LendPoolAddressesProvider address
   **/
  function unregisterAddressesProvider(address provider) external override onlyOwner {
    require(_addressesProviders[provider] > 0, Errors.LPAPR_PROVIDER_NOT_REGISTERED);
    _addressesProviders[provider] = 0;
    emit AddressesProviderUnregistered(provider);
  }
  /**
   * @dev Returns the id on a registered LendPoolAddressesProvider
   * @return The id or 0 if the LendPoolAddressesProvider is not registered
   */
  function getAddressesProviderIdByAddress(address addressesProvider) external view override returns (uint256) {
    return _addressesProviders[addressesProvider];
  }
  function _addToAddressesProvidersList(address provider) internal {
    uint256 providersCount = _addressesProvidersList.length;
    for (uint256 i = 0; i < providersCount; i++) {
      if (_addressesProvidersList[i] == provider) {
        return;
      }
    }
    _addressesProvidersList.push(provider);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title ILendPoolAddressesProviderRegistry contract
 * @dev Main registry of LendPoolAddressesProvider of multiple Bend protocol's markets
 * - Used for indexing purposes of Bend protocol's markets
 * - The id assigned to a LendPoolAddressesProvider refers to the market it is connected with,
 *   for example with `1` for the Bend main market and `2` for the next created
 * @author Bend
 **/
interface ILendPoolAddressesProviderRegistry {
  event AddressesProviderRegistered(address indexed newAddress);
  event AddressesProviderUnregistered(address indexed newAddress);
  function getAddressesProvidersList() external view returns (address[] memory);
  function getAddressesProviderIdByAddress(address addressesProvider) external view returns (uint256);
  function registerAddressesProvider(address provider, uint256 id) external;
  function unregisterAddressesProvider(address provider) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ERC721HolderUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/utils/ERC721HolderUpgradeable.sol";
import {IERC721Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
import {Errors} from "../libraries/helpers/Errors.sol";
import {IWETH} from "../interfaces/IWETH.sol";
import {IWETHGateway} from "../interfaces/IWETHGateway.sol";
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
import {ILendPool} from "../interfaces/ILendPool.sol";
import {ILendPoolLoan} from "../interfaces/ILendPoolLoan.sol";
import {IBToken} from "../interfaces/IBToken.sol";
import {DataTypes} from "../libraries/types/DataTypes.sol";
import {EmergencyTokenRecoveryUpgradeable} from "./EmergencyTokenRecoveryUpgradeable.sol";
contract WETHGateway is IWETHGateway, ERC721HolderUpgradeable, EmergencyTokenRecoveryUpgradeable {
  ILendPoolAddressesProvider internal _addressProvider;
  IWETH internal WETH;
  mapping(address => bool) internal _callerWhitelists;
  uint256 private constant _NOT_ENTERED = 0;
  uint256 private constant _ENTERED = 1;
  uint256 private _status;
  /**
   * @dev Prevents a contract from calling itself, directly or indirectly.
   * Calling a `nonReentrant` function from another `nonReentrant`
   * function is not supported. It is possible to prevent this from happening
   * by making the `nonReentrant` function external, and making it call a
   * `private` function that does the actual work.
   */
  modifier nonReentrant() {
    // On the first call to nonReentrant, _notEntered will be true
    require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
    // Any calls to nonReentrant after this point will fail
    _status = _ENTERED;
    _;
    // By storing the original value once again, a refund is triggered (see
    // https://eips.ethereum.org/EIPS/eip-2200)
    _status = _NOT_ENTERED;
  }
  /**
   * @dev Sets the WETH address and the LendPoolAddressesProvider address. Infinite approves lend pool.
   * @param weth Address of the Wrapped Ether contract
   **/
  function initialize(address addressProvider, address weth) public initializer {
    __ERC721Holder_init();
    __EmergencyTokenRecovery_init();
    _addressProvider = ILendPoolAddressesProvider(addressProvider);
    WETH = IWETH(weth);
    WETH.approve(address(_getLendPool()), type(uint256).max);
  }
  function _getLendPool() internal view returns (ILendPool) {
    return ILendPool(_addressProvider.getLendPool());
  }
  function _getLendPoolLoan() internal view returns (ILendPoolLoan) {
    return ILendPoolLoan(_addressProvider.getLendPoolLoan());
  }
  function authorizeLendPoolNFT(address[] calldata nftAssets) external nonReentrant onlyOwner {
    for (uint256 i = 0; i < nftAssets.length; i++) {
      IERC721Upgradeable(nftAssets[i]).setApprovalForAll(address(_getLendPool()), true);
    }
  }
  function authorizeCallerWhitelist(address[] calldata callers, bool flag) external nonReentrant onlyOwner {
    for (uint256 i = 0; i < callers.length; i++) {
      _callerWhitelists[callers[i]] = flag;
    }
  }
  function isCallerInWhitelist(address caller) external view returns (bool) {
    return _callerWhitelists[caller];
  }
  function _checkValidCallerAndOnBehalfOf(address onBehalfOf) internal view {
    require(
      (onBehalfOf == _msgSender()) || (_callerWhitelists[_msgSender()] == true),
      Errors.CALLER_NOT_ONBEHALFOF_OR_IN_WHITELIST
    );
  }
  function depositETH(address onBehalfOf, uint16 referralCode) external payable override nonReentrant {
    _checkValidCallerAndOnBehalfOf(onBehalfOf);
    ILendPool cachedPool = _getLendPool();
    WETH.deposit{value: msg.value}();
    cachedPool.deposit(address(WETH), msg.value, onBehalfOf, referralCode);
  }
  function withdrawETH(uint256 amount, address to) external override nonReentrant {
    _checkValidCallerAndOnBehalfOf(to);
    ILendPool cachedPool = _getLendPool();
    IBToken bWETH = IBToken(cachedPool.getReserveData(address(WETH)).bTokenAddress);
    uint256 userBalance = bWETH.balanceOf(msg.sender);
    uint256 amountToWithdraw = amount;
    // if amount is equal to uint(-1), the user wants to redeem everything
    if (amount == type(uint256).max) {
      amountToWithdraw = userBalance;
    }
    bWETH.transferFrom(msg.sender, address(this), amountToWithdraw);
    cachedPool.withdraw(address(WETH), amountToWithdraw, address(this));
    WETH.withdraw(amountToWithdraw);
    _safeTransferETH(to, amountToWithdraw);
  }
  function borrowETH(
    uint256 amount,
    address nftAsset,
    uint256 nftTokenId,
    address onBehalfOf,
    uint16 referralCode
  ) external override nonReentrant {
    _checkValidCallerAndOnBehalfOf(onBehalfOf);
    ILendPool cachedPool = _getLendPool();
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(nftAsset, nftTokenId);
    if (loanId == 0) {
      IERC721Upgradeable(nftAsset).safeTransferFrom(msg.sender, address(this), nftTokenId);
    }
    cachedPool.borrow(address(WETH), amount, nftAsset, nftTokenId, onBehalfOf, referralCode);
    WETH.withdraw(amount);
    _safeTransferETH(onBehalfOf, amount);
  }
  function batchBorrowETH(
    uint256[] calldata amounts,
    address[] calldata nftAssets,
    uint256[] calldata nftTokenIds,
    address onBehalfOf,
    uint16 referralCode
  ) external override nonReentrant {
    require(nftAssets.length == nftTokenIds.length, "inconsistent tokenIds length");
    require(nftAssets.length == amounts.length, "inconsistent amounts length");
    _checkValidCallerAndOnBehalfOf(onBehalfOf);
    ILendPool cachedPool = _getLendPool();
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    for (uint256 i = 0; i < nftAssets.length; i++) {
      uint256 loanId = cachedPoolLoan.getCollateralLoanId(nftAssets[i], nftTokenIds[i]);
      if (loanId == 0) {
        IERC721Upgradeable(nftAssets[i]).safeTransferFrom(msg.sender, address(this), nftTokenIds[i]);
      }
      cachedPool.borrow(address(WETH), amounts[i], nftAssets[i], nftTokenIds[i], onBehalfOf, referralCode);
      WETH.withdraw(amounts[i]);
      _safeTransferETH(onBehalfOf, amounts[i]);
    }
  }
  function repayETH(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount
  ) external payable override nonReentrant returns (uint256, bool) {
    (uint256 repayAmount, bool repayAll) = _repayETH(nftAsset, nftTokenId, amount, 0);
    // refund remaining dust eth
    if (msg.value > repayAmount) {
      _safeTransferETH(msg.sender, msg.value - repayAmount);
    }
    return (repayAmount, repayAll);
  }
  function batchRepayETH(
    address[] calldata nftAssets,
    uint256[] calldata nftTokenIds,
    uint256[] calldata amounts
  ) external payable override nonReentrant returns (uint256[] memory, bool[] memory) {
    require(nftAssets.length == amounts.length, "inconsistent amounts length");
    require(nftAssets.length == nftTokenIds.length, "inconsistent tokenIds length");
    uint256[] memory repayAmounts = new uint256[](nftAssets.length);
    bool[] memory repayAlls = new bool[](nftAssets.length);
    uint256 allRepayDebtAmount = 0;
    for (uint256 i = 0; i < nftAssets.length; i++) {
      (repayAmounts[i], repayAlls[i]) = _repayETH(nftAssets[i], nftTokenIds[i], amounts[i], allRepayDebtAmount);
      allRepayDebtAmount += repayAmounts[i];
    }
    // refund remaining dust eth
    if (msg.value > allRepayDebtAmount) {
      _safeTransferETH(msg.sender, msg.value - allRepayDebtAmount);
    }
    return (repayAmounts, repayAlls);
  }
  function _repayETH(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount,
    uint256 accAmount
  ) internal returns (uint256, bool) {
    ILendPool cachedPool = _getLendPool();
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(nftAsset, nftTokenId);
    require(loanId > 0, "collateral loan id not exist");
    (address reserveAsset, uint256 repayDebtAmount) = cachedPoolLoan.getLoanReserveBorrowAmount(loanId);
    require(reserveAsset == address(WETH), "loan reserve not WETH");
    if (amount < repayDebtAmount) {
      repayDebtAmount = amount;
    }
    require(msg.value >= (accAmount + repayDebtAmount), "msg.value is less than repay amount");
    WETH.deposit{value: repayDebtAmount}();
    (uint256 paybackAmount, bool burn) = cachedPool.repay(nftAsset, nftTokenId, amount);
    return (paybackAmount, burn);
  }
  function auctionETH(
    address nftAsset,
    uint256 nftTokenId,
    address onBehalfOf
  ) external payable override nonReentrant {
    _checkValidCallerAndOnBehalfOf(onBehalfOf);
    ILendPool cachedPool = _getLendPool();
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(nftAsset, nftTokenId);
    require(loanId > 0, "collateral loan id not exist");
    DataTypes.LoanData memory loan = cachedPoolLoan.getLoan(loanId);
    require(loan.reserveAsset == address(WETH), "loan reserve not WETH");
    WETH.deposit{value: msg.value}();
    cachedPool.auction(nftAsset, nftTokenId, msg.value, onBehalfOf);
  }
  function redeemETH(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount,
    uint256 bidFine
  ) external payable override nonReentrant returns (uint256) {
    ILendPool cachedPool = _getLendPool();
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(nftAsset, nftTokenId);
    require(loanId > 0, "collateral loan id not exist");
    DataTypes.LoanData memory loan = cachedPoolLoan.getLoan(loanId);
    require(loan.reserveAsset == address(WETH), "loan reserve not WETH");
    require(msg.value >= (amount + bidFine), "msg.value is less than redeem amount");
    WETH.deposit{value: msg.value}();
    uint256 paybackAmount = cachedPool.redeem(nftAsset, nftTokenId, amount, bidFine);
    // refund remaining dust eth
    if (msg.value > paybackAmount) {
      WETH.withdraw(msg.value - paybackAmount);
      _safeTransferETH(msg.sender, msg.value - paybackAmount);
    }
    return paybackAmount;
  }
  function liquidateETH(address nftAsset, uint256 nftTokenId) external payable override nonReentrant returns (uint256) {
    ILendPool cachedPool = _getLendPool();
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(nftAsset, nftTokenId);
    require(loanId > 0, "collateral loan id not exist");
    DataTypes.LoanData memory loan = cachedPoolLoan.getLoan(loanId);
    require(loan.reserveAsset == address(WETH), "loan reserve not WETH");
    if (msg.value > 0) {
      WETH.deposit{value: msg.value}();
    }
    uint256 extraAmount = cachedPool.liquidate(nftAsset, nftTokenId, msg.value);
    if (msg.value > extraAmount) {
      WETH.withdraw(msg.value - extraAmount);
      _safeTransferETH(msg.sender, msg.value - extraAmount);
    }
    return (extraAmount);
  }
  /**
   * @dev transfer ETH to an address, revert if it fails.
   * @param to recipient of the transfer
   * @param value the amount to send
   */
  function _safeTransferETH(address to, uint256 value) internal {
    (bool success, ) = to.call{value: value}(new bytes(0));
    require(success, "ETH_TRANSFER_FAILED");
  }
  /**
   * @dev Get WETH address used by WETHGateway
   */
  function getWETHAddress() external view returns (address) {
    return address(WETH);
  }
  /**
   * @dev Only WETH contract is allowed to transfer ETH here. Prevent other addresses to send Ether to this contract.
   */
  receive() external payable {
    require(msg.sender == address(WETH), "Receive not allowed");
  }
  /**
   * @dev Revert fallback calls
   */
  fallback() external payable {
    revert("Fallback not allowed");
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/utils/ERC721Holder.sol)
pragma solidity ^0.8.0;
import "../IERC721ReceiverUpgradeable.sol";
import "../../../proxy/utils/Initializable.sol";
/**
 * @dev Implementation of the {IERC721Receiver} interface.
 *
 * Accepts all token transfers.
 * Make sure the contract is able to use its token with {IERC721-safeTransferFrom}, {IERC721-approve} or {IERC721-setApprovalForAll}.
 */
contract ERC721HolderUpgradeable is Initializable, IERC721ReceiverUpgradeable {
    function __ERC721Holder_init() internal onlyInitializing {
        __ERC721Holder_init_unchained();
    }
    function __ERC721Holder_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev See {IERC721Receiver-onERC721Received}.
     *
     * Always returns `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address,
        address,
        uint256,
        bytes memory
    ) public virtual override returns (bytes4) {
        return this.onERC721Received.selector;
    }
    uint256[50] private __gap;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
interface IWETH {
  function deposit() external payable;
  function withdraw(uint256) external;
  function approve(address guy, uint256 wad) external returns (bool);
  function transferFrom(
    address src,
    address dst,
    uint256 wad
  ) external returns (bool);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
interface IWETHGateway {
  /**
   * @dev deposits WETH into the reserve, using native ETH. A corresponding amount of the overlying asset (bTokens)
   * is minted.
   * @param onBehalfOf address of the user who will receive the bTokens representing the deposit
   * @param referralCode integrators are assigned a referral code and can potentially receive rewards.
   **/
  function depositETH(address onBehalfOf, uint16 referralCode) external payable;
  /**
   * @dev withdraws the WETH _reserves of msg.sender.
   * @param amount amount of bWETH to withdraw and receive native ETH
   * @param to address of the user who will receive native ETH
   */
  function withdrawETH(uint256 amount, address to) external;
  /**
   * @dev borrow WETH, unwraps to ETH and send both the ETH and DebtTokens to msg.sender, via `approveDelegation` and onBehalf argument in `LendPool.borrow`.
   * @param amount the amount of ETH to borrow
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param onBehalfOf Address of the user who will receive the loan. Should be the address of the borrower itself
   * calling the function if he wants to borrow against his own collateral, or the address of the credit delegator
   * if he has been given credit delegation allowance
   * @param referralCode integrators are assigned a referral code and can potentially receive rewards
   */
  function borrowETH(
    uint256 amount,
    address nftAsset,
    uint256 nftTokenId,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  function batchBorrowETH(
    uint256[] calldata amounts,
    address[] calldata nftAssets,
    uint256[] calldata nftTokenIds,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  /**
   * @dev repays a borrow on the WETH reserve, for the specified amount (or for the whole amount, if uint256(-1) is specified).
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param amount the amount to repay, or uint256(-1) if the user wants to repay everything
   */
  function repayETH(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount
  ) external payable returns (uint256, bool);
  function batchRepayETH(
    address[] calldata nftAssets,
    uint256[] calldata nftTokenIds,
    uint256[] calldata amounts
  ) external payable returns (uint256[] memory, bool[] memory);
  /**
   * @dev auction a borrow on the WETH reserve
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param onBehalfOf Address of the user who will receive the underlying NFT used as collateral.
   * Should be the address of the borrower itself calling the function if he wants to borrow against his own collateral.
   */
  function auctionETH(
    address nftAsset,
    uint256 nftTokenId,
    address onBehalfOf
  ) external payable;
  /**
   * @dev redeems a borrow on the WETH reserve
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param amount The amount to repay the debt
   * @param bidFine The amount of bid fine
   */
  function redeemETH(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount,
    uint256 bidFine
  ) external payable returns (uint256);
  /**
   * @dev liquidates a borrow on the WETH reserve
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   */
  function liquidateETH(address nftAsset, uint256 nftTokenId) external payable returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {IERC721Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
import {IPunks} from "../interfaces/IPunks.sol";
/**
 * @title EmergencyTokenRecovery
 * @notice Add Emergency Recovery Logic to contract implementation
 * @author Bend
 **/
abstract contract EmergencyTokenRecoveryUpgradeable is OwnableUpgradeable {
  event EmergencyEtherTransfer(address indexed to, uint256 amount);
  function __EmergencyTokenRecovery_init() internal onlyInitializing {
    __Ownable_init();
  }
  /**
   * @dev transfer ERC20 from the utility contract, for ERC20 recovery in case of stuck tokens due
   * direct transfers to the contract address.
   * @param token token to transfer
   * @param to recipient of the transfer
   * @param amount amount to send
   */
  function emergencyERC20Transfer(
    address token,
    address to,
    uint256 amount
  ) external onlyOwner {
    IERC20Upgradeable(token).transfer(to, amount);
  }
  /**
   * @dev transfer ERC721 from the utility contract, for ERC721 recovery in case of stuck tokens due
   * direct transfers to the contract address.
   * @param token token to transfer
   * @param to recipient of the transfer
   * @param id token id to send
   */
  function emergencyERC721Transfer(
    address token,
    address to,
    uint256 id
  ) external onlyOwner {
    IERC721Upgradeable(token).safeTransferFrom(address(this), to, id);
  }
  /**
   * @dev transfer CryptoPunks from the utility contract, for punks recovery in case of stuck punks
   * due direct transfers to the contract address.
   * @param to recipient of the transfer
   * @param index punk index to send
   */
  function emergencyPunksTransfer(
    address punks,
    address to,
    uint256 index
  ) external onlyOwner {
    IPunks(punks).transferPunk(to, index);
  }
  /**
   * @dev transfer native Ether from the utility contract, for native Ether recovery in case of stuck Ether
   * due selfdestructs or transfer ether to pre-computated contract address before deployment.
   * @param to recipient of the transfer
   * @param amount amount to send
   */
  function emergencyEtherTransfer(address to, uint256 amount) external onlyOwner {
    (bool success, ) = to.call{value: amount}(new bytes(0));
    require(success, "ETH_TRANSFER_FAILED");
    emit EmergencyEtherTransfer(to, amount);
  }
  uint256[50] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Context_init_unchained();
        __Ownable_init_unchained();
    }
    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
    uint256[49] private __gap;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @dev Interface for a permittable ERC721 contract
 * See https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC72 allowance (see {IERC721-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC721-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IPunks {
  function balanceOf(address account) external view returns (uint256);
  function punkIndexToAddress(uint256 punkIndex) external view returns (address owner);
  function buyPunk(uint256 punkIndex) external;
  function transferPunk(address to, uint256 punkIndex) external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";
/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
        __Context_init_unchained();
    }
    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
    uint256[50] private __gap;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import {IERC721Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
import {ERC721HolderUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/utils/ERC721HolderUpgradeable.sol";
import {Errors} from "../libraries/helpers/Errors.sol";
import {ILendPool} from "../interfaces/ILendPool.sol";
import {ILendPoolLoan} from "../interfaces/ILendPoolLoan.sol";
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
import {IPunks} from "../interfaces/IPunks.sol";
import {IWrappedPunks} from "../interfaces/IWrappedPunks.sol";
import {IPunkGateway} from "../interfaces/IPunkGateway.sol";
import {DataTypes} from "../libraries/types/DataTypes.sol";
import {IWETHGateway} from "../interfaces/IWETHGateway.sol";
import {EmergencyTokenRecoveryUpgradeable} from "./EmergencyTokenRecoveryUpgradeable.sol";
contract PunkGateway is IPunkGateway, ERC721HolderUpgradeable, EmergencyTokenRecoveryUpgradeable {
  using SafeERC20Upgradeable for IERC20Upgradeable;
  ILendPoolAddressesProvider internal _addressProvider;
  IWETHGateway internal _wethGateway;
  IPunks public punks;
  IWrappedPunks public wrappedPunks;
  address public proxy;
  mapping(address => bool) internal _callerWhitelists;
  uint256 private constant _NOT_ENTERED = 0;
  uint256 private constant _ENTERED = 1;
  uint256 private _status;
  /**
   * @dev Prevents a contract from calling itself, directly or indirectly.
   * Calling a `nonReentrant` function from another `nonReentrant`
   * function is not supported. It is possible to prevent this from happening
   * by making the `nonReentrant` function external, and making it call a
   * `private` function that does the actual work.
   */
  modifier nonReentrant() {
    // On the first call to nonReentrant, _notEntered will be true
    require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
    // Any calls to nonReentrant after this point will fail
    _status = _ENTERED;
    _;
    // By storing the original value once again, a refund is triggered (see
    // https://eips.ethereum.org/EIPS/eip-2200)
    _status = _NOT_ENTERED;
  }
  function initialize(
    address addressProvider,
    address wethGateway,
    address _punks,
    address _wrappedPunks
  ) public initializer {
    __ERC721Holder_init();
    __EmergencyTokenRecovery_init();
    _addressProvider = ILendPoolAddressesProvider(addressProvider);
    _wethGateway = IWETHGateway(wethGateway);
    punks = IPunks(_punks);
    wrappedPunks = IWrappedPunks(_wrappedPunks);
    wrappedPunks.registerProxy();
    proxy = wrappedPunks.proxyInfo(address(this));
    IERC721Upgradeable(address(wrappedPunks)).setApprovalForAll(address(_getLendPool()), true);
    IERC721Upgradeable(address(wrappedPunks)).setApprovalForAll(address(_wethGateway), true);
  }
  function _getLendPool() internal view returns (ILendPool) {
    return ILendPool(_addressProvider.getLendPool());
  }
  function _getLendPoolLoan() internal view returns (ILendPoolLoan) {
    return ILendPoolLoan(_addressProvider.getLendPoolLoan());
  }
  function authorizeLendPoolERC20(address[] calldata tokens) external nonReentrant onlyOwner {
    for (uint256 i = 0; i < tokens.length; i++) {
      IERC20Upgradeable(tokens[i]).approve(address(_getLendPool()), type(uint256).max);
    }
  }
  function authorizeCallerWhitelist(address[] calldata callers, bool flag) external nonReentrant onlyOwner {
    for (uint256 i = 0; i < callers.length; i++) {
      _callerWhitelists[callers[i]] = flag;
    }
  }
  function isCallerInWhitelist(address caller) external view returns (bool) {
    return _callerWhitelists[caller];
  }
  function _checkValidCallerAndOnBehalfOf(address onBehalfOf) internal view {
    require(
      (onBehalfOf == _msgSender()) || (_callerWhitelists[_msgSender()] == true),
      Errors.CALLER_NOT_ONBEHALFOF_OR_IN_WHITELIST
    );
  }
  function _depositPunk(uint256 punkIndex) internal {
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(address(wrappedPunks), punkIndex);
    if (loanId != 0) {
      return;
    }
    address owner = punks.punkIndexToAddress(punkIndex);
    require(owner == _msgSender(), "PunkGateway: not owner of punkIndex");
    punks.buyPunk(punkIndex);
    punks.transferPunk(proxy, punkIndex);
    wrappedPunks.mint(punkIndex);
  }
  function borrow(
    address reserveAsset,
    uint256 amount,
    uint256 punkIndex,
    address onBehalfOf,
    uint16 referralCode
  ) external override nonReentrant {
    _checkValidCallerAndOnBehalfOf(onBehalfOf);
    ILendPool cachedPool = _getLendPool();
    _depositPunk(punkIndex);
    cachedPool.borrow(reserveAsset, amount, address(wrappedPunks), punkIndex, onBehalfOf, referralCode);
    IERC20Upgradeable(reserveAsset).transfer(onBehalfOf, amount);
  }
  function batchBorrow(
    address[] calldata reserveAssets,
    uint256[] calldata amounts,
    uint256[] calldata punkIndexs,
    address onBehalfOf,
    uint16 referralCode
  ) external override nonReentrant {
    require(punkIndexs.length == reserveAssets.length, "inconsistent reserveAssets length");
    require(punkIndexs.length == amounts.length, "inconsistent amounts length");
    _checkValidCallerAndOnBehalfOf(onBehalfOf);
    ILendPool cachedPool = _getLendPool();
    for (uint256 i = 0; i < punkIndexs.length; i++) {
      _depositPunk(punkIndexs[i]);
      cachedPool.borrow(reserveAssets[i], amounts[i], address(wrappedPunks), punkIndexs[i], onBehalfOf, referralCode);
      IERC20Upgradeable(reserveAssets[i]).transfer(onBehalfOf, amounts[i]);
    }
  }
  function _withdrawPunk(uint256 punkIndex, address onBehalfOf) internal {
    address owner = wrappedPunks.ownerOf(punkIndex);
    require(owner == _msgSender(), "PunkGateway: caller is not owner");
    require(owner == onBehalfOf, "PunkGateway: onBehalfOf is not owner");
    wrappedPunks.safeTransferFrom(onBehalfOf, address(this), punkIndex);
    wrappedPunks.burn(punkIndex);
    punks.transferPunk(onBehalfOf, punkIndex);
  }
  function repay(uint256 punkIndex, uint256 amount) external override nonReentrant returns (uint256, bool) {
    return _repay(punkIndex, amount);
  }
  function batchRepay(uint256[] calldata punkIndexs, uint256[] calldata amounts)
    external
    override
    nonReentrant
    returns (uint256[] memory, bool[] memory)
  {
    require(punkIndexs.length == amounts.length, "inconsistent amounts length");
    uint256[] memory repayAmounts = new uint256[](punkIndexs.length);
    bool[] memory repayAlls = new bool[](punkIndexs.length);
    for (uint256 i = 0; i < punkIndexs.length; i++) {
      (repayAmounts[i], repayAlls[i]) = _repay(punkIndexs[i], amounts[i]);
    }
    return (repayAmounts, repayAlls);
  }
  function _repay(uint256 punkIndex, uint256 amount) internal returns (uint256, bool) {
    ILendPool cachedPool = _getLendPool();
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(address(wrappedPunks), punkIndex);
    require(loanId != 0, "PunkGateway: no loan with such punkIndex");
    (, , address reserve, ) = cachedPoolLoan.getLoanCollateralAndReserve(loanId);
    (, uint256 debt) = cachedPoolLoan.getLoanReserveBorrowAmount(loanId);
    address borrower = cachedPoolLoan.borrowerOf(loanId);
    if (amount > debt) {
      amount = debt;
    }
    IERC20Upgradeable(reserve).transferFrom(msg.sender, address(this), amount);
    (uint256 paybackAmount, bool burn) = cachedPool.repay(address(wrappedPunks), punkIndex, amount);
    if (burn) {
      require(borrower == _msgSender(), "PunkGateway: caller is not borrower");
      _withdrawPunk(punkIndex, borrower);
    }
    return (paybackAmount, burn);
  }
  function auction(
    uint256 punkIndex,
    uint256 bidPrice,
    address onBehalfOf
  ) external override nonReentrant {
    _checkValidCallerAndOnBehalfOf(onBehalfOf);
    ILendPool cachedPool = _getLendPool();
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(address(wrappedPunks), punkIndex);
    require(loanId != 0, "PunkGateway: no loan with such punkIndex");
    (, , address reserve, ) = cachedPoolLoan.getLoanCollateralAndReserve(loanId);
    IERC20Upgradeable(reserve).transferFrom(msg.sender, address(this), bidPrice);
    cachedPool.auction(address(wrappedPunks), punkIndex, bidPrice, onBehalfOf);
  }
  function redeem(
    uint256 punkIndex,
    uint256 amount,
    uint256 bidFine
  ) external override nonReentrant returns (uint256) {
    ILendPool cachedPool = _getLendPool();
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(address(wrappedPunks), punkIndex);
    require(loanId != 0, "PunkGateway: no loan with such punkIndex");
    DataTypes.LoanData memory loan = cachedPoolLoan.getLoan(loanId);
    IERC20Upgradeable(loan.reserveAsset).transferFrom(msg.sender, address(this), (amount + bidFine));
    uint256 paybackAmount = cachedPool.redeem(address(wrappedPunks), punkIndex, amount, bidFine);
    if ((amount + bidFine) > paybackAmount) {
      IERC20Upgradeable(loan.reserveAsset).safeTransfer(msg.sender, ((amount + bidFine) - paybackAmount));
    }
    return paybackAmount;
  }
  function liquidate(uint256 punkIndex, uint256 amount) external override nonReentrant returns (uint256) {
    ILendPool cachedPool = _getLendPool();
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(address(wrappedPunks), punkIndex);
    require(loanId != 0, "PunkGateway: no loan with such punkIndex");
    DataTypes.LoanData memory loan = cachedPoolLoan.getLoan(loanId);
    require(loan.bidderAddress == _msgSender(), "PunkGateway: caller is not bidder");
    if (amount > 0) {
      IERC20Upgradeable(loan.reserveAsset).transferFrom(msg.sender, address(this), amount);
    }
    uint256 extraRetAmount = cachedPool.liquidate(address(wrappedPunks), punkIndex, amount);
    _withdrawPunk(punkIndex, loan.bidderAddress);
    if (amount > extraRetAmount) {
      IERC20Upgradeable(loan.reserveAsset).safeTransfer(msg.sender, (amount - extraRetAmount));
    }
    return (extraRetAmount);
  }
  function borrowETH(
    uint256 amount,
    uint256 punkIndex,
    address onBehalfOf,
    uint16 referralCode
  ) external override nonReentrant {
    _checkValidCallerAndOnBehalfOf(onBehalfOf);
    _depositPunk(punkIndex);
    _wethGateway.borrowETH(amount, address(wrappedPunks), punkIndex, onBehalfOf, referralCode);
  }
  function batchBorrowETH(
    uint256[] calldata amounts,
    uint256[] calldata punkIndexs,
    address onBehalfOf,
    uint16 referralCode
  ) external override nonReentrant {
    require(punkIndexs.length == amounts.length, "inconsistent amounts length");
    _checkValidCallerAndOnBehalfOf(onBehalfOf);
    address[] memory nftAssets = new address[](punkIndexs.length);
    for (uint256 i = 0; i < punkIndexs.length; i++) {
      nftAssets[i] = address(wrappedPunks);
      _depositPunk(punkIndexs[i]);
    }
    _wethGateway.batchBorrowETH(amounts, nftAssets, punkIndexs, onBehalfOf, referralCode);
  }
  function repayETH(uint256 punkIndex, uint256 amount) external payable override nonReentrant returns (uint256, bool) {
    (uint256 paybackAmount, bool burn) = _repayETH(punkIndex, amount, 0);
    // refund remaining dust eth
    if (msg.value > paybackAmount) {
      _safeTransferETH(msg.sender, msg.value - paybackAmount);
    }
    return (paybackAmount, burn);
  }
  function batchRepayETH(uint256[] calldata punkIndexs, uint256[] calldata amounts)
    external
    payable
    override
    nonReentrant
    returns (uint256[] memory, bool[] memory)
  {
    require(punkIndexs.length == amounts.length, "inconsistent amounts length");
    uint256[] memory repayAmounts = new uint256[](punkIndexs.length);
    bool[] memory repayAlls = new bool[](punkIndexs.length);
    uint256 allRepayAmount = 0;
    for (uint256 i = 0; i < punkIndexs.length; i++) {
      (repayAmounts[i], repayAlls[i]) = _repayETH(punkIndexs[i], amounts[i], allRepayAmount);
      allRepayAmount += repayAmounts[i];
    }
    // refund remaining dust eth
    if (msg.value > allRepayAmount) {
      _safeTransferETH(msg.sender, msg.value - allRepayAmount);
    }
    return (repayAmounts, repayAlls);
  }
  function _repayETH(
    uint256 punkIndex,
    uint256 amount,
    uint256 accAmount
  ) internal returns (uint256, bool) {
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(address(wrappedPunks), punkIndex);
    require(loanId != 0, "PunkGateway: no loan with such punkIndex");
    address borrower = cachedPoolLoan.borrowerOf(loanId);
    require(borrower == _msgSender(), "PunkGateway: caller is not borrower");
    (, uint256 repayDebtAmount) = cachedPoolLoan.getLoanReserveBorrowAmount(loanId);
    if (amount < repayDebtAmount) {
      repayDebtAmount = amount;
    }
    require(msg.value >= (accAmount + repayDebtAmount), "msg.value is less than repay amount");
    (uint256 paybackAmount, bool burn) = _wethGateway.repayETH{value: repayDebtAmount}(
      address(wrappedPunks),
      punkIndex,
      amount
    );
    if (burn) {
      _withdrawPunk(punkIndex, borrower);
    }
    return (paybackAmount, burn);
  }
  function auctionETH(uint256 punkIndex, address onBehalfOf) external payable override nonReentrant {
    _checkValidCallerAndOnBehalfOf(onBehalfOf);
    _wethGateway.auctionETH{value: msg.value}(address(wrappedPunks), punkIndex, onBehalfOf);
  }
  function redeemETH(
    uint256 punkIndex,
    uint256 amount,
    uint256 bidFine
  ) external payable override nonReentrant returns (uint256) {
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(address(wrappedPunks), punkIndex);
    require(loanId != 0, "PunkGateway: no loan with such punkIndex");
    //DataTypes.LoanData memory loan = cachedPoolLoan.getLoan(loanId);
    uint256 paybackAmount = _wethGateway.redeemETH{value: msg.value}(address(wrappedPunks), punkIndex, amount, bidFine);
    // refund remaining dust eth
    if (msg.value > paybackAmount) {
      _safeTransferETH(msg.sender, msg.value - paybackAmount);
    }
    return paybackAmount;
  }
  function liquidateETH(uint256 punkIndex) external payable override nonReentrant returns (uint256) {
    ILendPoolLoan cachedPoolLoan = _getLendPoolLoan();
    uint256 loanId = cachedPoolLoan.getCollateralLoanId(address(wrappedPunks), punkIndex);
    require(loanId != 0, "PunkGateway: no loan with such punkIndex");
    DataTypes.LoanData memory loan = cachedPoolLoan.getLoan(loanId);
    require(loan.bidderAddress == _msgSender(), "PunkGateway: caller is not bidder");
    uint256 extraAmount = _wethGateway.liquidateETH{value: msg.value}(address(wrappedPunks), punkIndex);
    _withdrawPunk(punkIndex, loan.bidderAddress);
    // refund remaining dust eth
    if (msg.value > extraAmount) {
      _safeTransferETH(msg.sender, msg.value - extraAmount);
    }
    return extraAmount;
  }
  /**
   * @dev transfer ETH to an address, revert if it fails.
   * @param to recipient of the transfer
   * @param value the amount to send
   */
  function _safeTransferETH(address to, uint256 value) internal {
    (bool success, ) = to.call{value: value}(new bytes(0));
    require(success, "ETH_TRANSFER_FAILED");
  }
  /**
   * @dev
   */
  receive() external payable {}
  /**
   * @dev Revert fallback calls
   */
  fallback() external payable {
    revert("Fallback not allowed");
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.0;
import "../IERC20Upgradeable.sol";
import "../../../utils/AddressUpgradeable.sol";
/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20Upgradeable {
    using AddressUpgradeable for address;
    function safeTransfer(
        IERC20Upgradeable token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }
    function safeTransferFrom(
        IERC20Upgradeable token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }
    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }
    function safeIncreaseAllowance(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    function safeDecreaseAllowance(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }
    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20Upgradeable token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.
        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
/**
 * @dev Interface for a permittable ERC721 contract
 * See https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC72 allowance (see {IERC721-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC721-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IWrappedPunks is IERC721 {
  function punkContract() external view returns (address);
  function mint(uint256 punkIndex) external;
  function burn(uint256 punkIndex) external;
  function registerProxy() external;
  function proxyInfo(address user) external returns (address proxy);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
interface IPunkGateway {
  /**
   * @dev Allows users to borrow a specific `amount` of the reserve underlying asset, provided that the borrower
   * already deposited enough collateral
   * - E.g. User borrows 100 USDC, receiving the 100 USDC in his wallet
   *   and lock collateral asset in contract
   * @param reserveAsset The address of the underlying asset to borrow
   * @param amount The amount to be borrowed
   * @param punkIndex The index of the CryptoPunk used as collteral
   * @param onBehalfOf Address of the user who will receive the loan. Should be the address of the borrower itself
   * calling the function if he wants to borrow against his own collateral, or the address of the credit delegator
   * if he has been given credit delegation allowance
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   **/
  function borrow(
    address reserveAsset,
    uint256 amount,
    uint256 punkIndex,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  function batchBorrow(
    address[] calldata reserveAssets,
    uint256[] calldata amounts,
    uint256[] calldata punkIndexs,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  /**
   * @notice Repays a borrowed `amount` on a specific punk, burning the equivalent loan owned
   * - E.g. User repays 100 USDC, burning loan and receives collateral asset
   * @param punkIndex The index of the CryptoPunk used as collteral
   * @param amount The amount to repay
   * @return The final amount repaid, loan is burned or not
   **/
  function repay(uint256 punkIndex, uint256 amount) external returns (uint256, bool);
  function batchRepay(uint256[] calldata punkIndexs, uint256[] calldata amounts)
    external
    returns (uint256[] memory, bool[] memory);
  /**
   * @notice auction a unhealth punk loan with ERC20 reserve
   * @param punkIndex The index of the CryptoPunk used as collteral
   * @param bidPrice The bid price
   **/
  function auction(
    uint256 punkIndex,
    uint256 bidPrice,
    address onBehalfOf
  ) external;
  /**
   * @notice redeem a unhealth punk loan with ERC20 reserve
   * @param punkIndex The index of the CryptoPunk used as collteral
   * @param amount The amount to repay the debt
   * @param bidFine The amount of bid fine
   **/
  function redeem(
    uint256 punkIndex,
    uint256 amount,
    uint256 bidFine
  ) external returns (uint256);
  /**
   * @notice liquidate a unhealth punk loan with ERC20 reserve
   * @param punkIndex The index of the CryptoPunk used as collteral
   **/
  function liquidate(uint256 punkIndex, uint256 amount) external returns (uint256);
  /**
   * @dev Allows users to borrow a specific `amount` of the reserve underlying asset, provided that the borrower
   * already deposited enough collateral
   * - E.g. User borrows 100 ETH, receiving the 100 ETH in his wallet
   *   and lock collateral asset in contract
   * @param amount The amount to be borrowed
   * @param punkIndex The index of the CryptoPunk to deposit
   * @param onBehalfOf Address of the user who will receive the loan. Should be the address of the borrower itself
   * calling the function if he wants to borrow against his own collateral, or the address of the credit delegator
   * if he has been given credit delegation allowance
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   **/
  function borrowETH(
    uint256 amount,
    uint256 punkIndex,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  function batchBorrowETH(
    uint256[] calldata amounts,
    uint256[] calldata punkIndexs,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  /**
   * @notice Repays a borrowed `amount` on a specific punk with native ETH
   * - E.g. User repays 100 ETH, burning loan and receives collateral asset
   * @param punkIndex The index of the CryptoPunk to repay
   * @param amount The amount to repay
   * @return The final amount repaid, loan is burned or not
   **/
  function repayETH(uint256 punkIndex, uint256 amount) external payable returns (uint256, bool);
  function batchRepayETH(uint256[] calldata punkIndexs, uint256[] calldata amounts)
    external
    payable
    returns (uint256[] memory, bool[] memory);
  /**
   * @notice auction a unhealth punk loan with native ETH
   * @param punkIndex The index of the CryptoPunk to repay
   * @param onBehalfOf Address of the user who will receive the CryptoPunk. Should be the address of the user itself
   * calling the function if he wants to get collateral
   **/
  function auctionETH(uint256 punkIndex, address onBehalfOf) external payable;
  /**
   * @notice liquidate a unhealth punk loan with native ETH
   * @param punkIndex The index of the CryptoPunk to repay
   * @param amount The amount to repay the debt
   * @param bidFine The amount of bid fine
   **/
  function redeemETH(
    uint256 punkIndex,
    uint256 amount,
    uint256 bidFine
  ) external payable returns (uint256);
  /**
   * @notice liquidate a unhealth punk loan with native ETH
   * @param punkIndex The index of the CryptoPunk to repay
   **/
  function liquidateETH(uint256 punkIndex) external payable returns (uint256);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165.sol";
/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);
    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;
    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);
    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;
    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IBNFT} from "../interfaces/IBNFT.sol";
import {ILendPoolLoan} from "../interfaces/ILendPoolLoan.sol";
import {ILendPool} from "../interfaces/ILendPool.sol";
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
import {Errors} from "../libraries/helpers/Errors.sol";
import {DataTypes} from "../libraries/types/DataTypes.sol";
import {WadRayMath} from "../libraries/math/WadRayMath.sol";
import {IERC721Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
import {IERC721ReceiverUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721ReceiverUpgradeable.sol";
import {CountersUpgradeable} from "@openzeppelin/contracts-upgradeable/utils/CountersUpgradeable.sol";
import {Initializable} from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import {ContextUpgradeable} from "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";
contract LendPoolLoan is Initializable, ILendPoolLoan, ContextUpgradeable, IERC721ReceiverUpgradeable {
  using WadRayMath for uint256;
  using CountersUpgradeable for CountersUpgradeable.Counter;
  ILendPoolAddressesProvider private _addressesProvider;
  CountersUpgradeable.Counter private _loanIdTracker;
  mapping(uint256 => DataTypes.LoanData) private _loans;
  // nftAsset + nftTokenId => loanId
  mapping(address => mapping(uint256 => uint256)) private _nftToLoanIds;
  mapping(address => uint256) private _nftTotalCollateral;
  mapping(address => mapping(address => uint256)) private _userNftCollateral;
  /**
   * @dev Only lending pool can call functions marked by this modifier
   **/
  modifier onlyLendPool() {
    require(_msgSender() == address(_getLendPool()), Errors.CT_CALLER_MUST_BE_LEND_POOL);
    _;
  }
  // called once by the factory at time of deployment
  function initialize(ILendPoolAddressesProvider provider) external initializer {
    __Context_init();
    _addressesProvider = provider;
    // Avoid having loanId = 0
    _loanIdTracker.increment();
    emit Initialized(address(_getLendPool()));
  }
  function initNft(address nftAsset, address bNftAddress) external override onlyLendPool {
    IERC721Upgradeable(nftAsset).setApprovalForAll(bNftAddress, true);
  }
  /**
   * @inheritdoc ILendPoolLoan
   */
  function createLoan(
    address initiator,
    address onBehalfOf,
    address nftAsset,
    uint256 nftTokenId,
    address bNftAddress,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  ) external override onlyLendPool returns (uint256) {
    require(_nftToLoanIds[nftAsset][nftTokenId] == 0, Errors.LP_NFT_HAS_USED_AS_COLLATERAL);
    // index is expressed in Ray, so:
    // amount.wadToRay().rayDiv(index).rayToWad() => amount.rayDiv(index)
    uint256 amountScaled = amount.rayDiv(borrowIndex);
    uint256 loanId = _loanIdTracker.current();
    _loanIdTracker.increment();
    _nftToLoanIds[nftAsset][nftTokenId] = loanId;
    // transfer underlying NFT asset to pool and mint bNFT to onBehalfOf
    IERC721Upgradeable(nftAsset).safeTransferFrom(_msgSender(), address(this), nftTokenId);
    IBNFT(bNftAddress).mint(onBehalfOf, nftTokenId);
    // Save Info
    DataTypes.LoanData storage loanData = _loans[loanId];
    loanData.loanId = loanId;
    loanData.state = DataTypes.LoanState.Active;
    loanData.borrower = onBehalfOf;
    loanData.nftAsset = nftAsset;
    loanData.nftTokenId = nftTokenId;
    loanData.reserveAsset = reserveAsset;
    loanData.scaledAmount = amountScaled;
    _userNftCollateral[onBehalfOf][nftAsset] += 1;
    _nftTotalCollateral[nftAsset] += 1;
    emit LoanCreated(initiator, onBehalfOf, loanId, nftAsset, nftTokenId, reserveAsset, amount, borrowIndex);
    return (loanId);
  }
  /**
   * @inheritdoc ILendPoolLoan
   */
  function updateLoan(
    address initiator,
    uint256 loanId,
    uint256 amountAdded,
    uint256 amountTaken,
    uint256 borrowIndex
  ) external override onlyLendPool {
    // Must use storage to change state
    DataTypes.LoanData storage loan = _loans[loanId];
    // Ensure valid loan state
    require(loan.state == DataTypes.LoanState.Active, Errors.LPL_INVALID_LOAN_STATE);
    uint256 amountScaled = 0;
    if (amountAdded > 0) {
      amountScaled = amountAdded.rayDiv(borrowIndex);
      require(amountScaled != 0, Errors.LPL_INVALID_LOAN_AMOUNT);
      loan.scaledAmount += amountScaled;
    }
    if (amountTaken > 0) {
      amountScaled = amountTaken.rayDiv(borrowIndex);
      require(amountScaled != 0, Errors.LPL_INVALID_TAKEN_AMOUNT);
      require(loan.scaledAmount >= amountScaled, Errors.LPL_AMOUNT_OVERFLOW);
      loan.scaledAmount -= amountScaled;
    }
    emit LoanUpdated(
      initiator,
      loanId,
      loan.nftAsset,
      loan.nftTokenId,
      loan.reserveAsset,
      amountAdded,
      amountTaken,
      borrowIndex
    );
  }
  /**
   * @inheritdoc ILendPoolLoan
   */
  function repayLoan(
    address initiator,
    uint256 loanId,
    address bNftAddress,
    uint256 amount,
    uint256 borrowIndex
  ) external override onlyLendPool {
    // Must use storage to change state
    DataTypes.LoanData storage loan = _loans[loanId];
    // Ensure valid loan state
    require(loan.state == DataTypes.LoanState.Active, Errors.LPL_INVALID_LOAN_STATE);
    // state changes and cleanup
    // NOTE: these must be performed before assets are released to prevent reentrance
    _loans[loanId].state = DataTypes.LoanState.Repaid;
    _nftToLoanIds[loan.nftAsset][loan.nftTokenId] = 0;
    require(_userNftCollateral[loan.borrower][loan.nftAsset] >= 1, Errors.LP_INVALIED_USER_NFT_AMOUNT);
    _userNftCollateral[loan.borrower][loan.nftAsset] -= 1;
    require(_nftTotalCollateral[loan.nftAsset] >= 1, Errors.LP_INVALIED_NFT_AMOUNT);
    _nftTotalCollateral[loan.nftAsset] -= 1;
    // burn bNFT and transfer underlying NFT asset to user
    IBNFT(bNftAddress).burn(loan.nftTokenId);
    IERC721Upgradeable(loan.nftAsset).safeTransferFrom(address(this), _msgSender(), loan.nftTokenId);
    emit LoanRepaid(initiator, loanId, loan.nftAsset, loan.nftTokenId, loan.reserveAsset, amount, borrowIndex);
  }
  /**
   * @inheritdoc ILendPoolLoan
   */
  function auctionLoan(
    address initiator,
    uint256 loanId,
    address onBehalfOf,
    uint256 bidPrice,
    uint256 borrowAmount,
    uint256 borrowIndex
  ) external override onlyLendPool {
    // Must use storage to change state
    DataTypes.LoanData storage loan = _loans[loanId];
    address previousBidder = loan.bidderAddress;
    uint256 previousPrice = loan.bidPrice;
    // Ensure valid loan state
    if (loan.bidStartTimestamp == 0) {
      require(loan.state == DataTypes.LoanState.Active, Errors.LPL_INVALID_LOAN_STATE);
      loan.state = DataTypes.LoanState.Auction;
      loan.bidStartTimestamp = block.timestamp;
    } else {
      require(loan.state == DataTypes.LoanState.Auction, Errors.LPL_INVALID_LOAN_STATE);
      require(bidPrice > loan.bidPrice, Errors.LPL_BID_PRICE_LESS_THAN_HIGHEST_PRICE);
    }
    loan.bidBorrowAmount = borrowAmount;
    loan.bidderAddress = onBehalfOf;
    loan.bidPrice = bidPrice;
    emit LoanAuctioned(
      initiator,
      loanId,
      loan.nftAsset,
      loan.nftTokenId,
      loan.bidBorrowAmount,
      borrowIndex,
      onBehalfOf,
      bidPrice,
      previousBidder,
      previousPrice
    );
  }
  /**
   * @inheritdoc ILendPoolLoan
   */
  function redeemLoan(
    address initiator,
    uint256 loanId,
    uint256 amountTaken,
    uint256 borrowIndex
  ) external override onlyLendPool {
    // Must use storage to change state
    DataTypes.LoanData storage loan = _loans[loanId];
    // Ensure valid loan state
    require(loan.state == DataTypes.LoanState.Auction, Errors.LPL_INVALID_LOAN_STATE);
    uint256 amountScaled = amountTaken.rayDiv(borrowIndex);
    require(amountScaled != 0, Errors.LPL_INVALID_TAKEN_AMOUNT);
    require(loan.scaledAmount >= amountScaled, Errors.LPL_AMOUNT_OVERFLOW);
    loan.scaledAmount -= amountScaled;
    loan.state = DataTypes.LoanState.Active;
    loan.bidStartTimestamp = 0;
    loan.bidBorrowAmount = 0;
    loan.bidderAddress = address(0);
    loan.bidPrice = 0;
    emit LoanRedeemed(initiator, loanId, loan.nftAsset, loan.nftTokenId, loan.reserveAsset, amountTaken, borrowIndex);
  }
  /**
   * @inheritdoc ILendPoolLoan
   */
  function liquidateLoan(
    address initiator,
    uint256 loanId,
    address bNftAddress,
    uint256 borrowAmount,
    uint256 borrowIndex
  ) external override onlyLendPool {
    // Must use storage to change state
    DataTypes.LoanData storage loan = _loans[loanId];
    // Ensure valid loan state
    require(loan.state == DataTypes.LoanState.Auction, Errors.LPL_INVALID_LOAN_STATE);
    // state changes and cleanup
    // NOTE: these must be performed before assets are released to prevent reentrance
    _loans[loanId].state = DataTypes.LoanState.Defaulted;
    _loans[loanId].bidBorrowAmount = borrowAmount;
    _nftToLoanIds[loan.nftAsset][loan.nftTokenId] = 0;
    require(_userNftCollateral[loan.borrower][loan.nftAsset] >= 1, Errors.LP_INVALIED_USER_NFT_AMOUNT);
    _userNftCollateral[loan.borrower][loan.nftAsset] -= 1;
    require(_nftTotalCollateral[loan.nftAsset] >= 1, Errors.LP_INVALIED_NFT_AMOUNT);
    _nftTotalCollateral[loan.nftAsset] -= 1;
    // burn bNFT and transfer underlying NFT asset to user
    IBNFT(bNftAddress).burn(loan.nftTokenId);
    IERC721Upgradeable(loan.nftAsset).safeTransferFrom(address(this), _msgSender(), loan.nftTokenId);
    emit LoanLiquidated(
      initiator,
      loanId,
      loan.nftAsset,
      loan.nftTokenId,
      loan.reserveAsset,
      borrowAmount,
      borrowIndex
    );
  }
  function onERC721Received(
    address operator,
    address from,
    uint256 tokenId,
    bytes calldata data
  ) external pure override returns (bytes4) {
    operator;
    from;
    tokenId;
    data;
    return IERC721ReceiverUpgradeable.onERC721Received.selector;
  }
  function borrowerOf(uint256 loanId) external view override returns (address) {
    return _loans[loanId].borrower;
  }
  function getCollateralLoanId(address nftAsset, uint256 nftTokenId) external view override returns (uint256) {
    return _nftToLoanIds[nftAsset][nftTokenId];
  }
  function getLoan(uint256 loanId) external view override returns (DataTypes.LoanData memory loanData) {
    return _loans[loanId];
  }
  function getLoanCollateralAndReserve(uint256 loanId)
    external
    view
    override
    returns (
      address nftAsset,
      uint256 nftTokenId,
      address reserveAsset,
      uint256 scaledAmount
    )
  {
    return (
      _loans[loanId].nftAsset,
      _loans[loanId].nftTokenId,
      _loans[loanId].reserveAsset,
      _loans[loanId].scaledAmount
    );
  }
  function getLoanReserveBorrowAmount(uint256 loanId) external view override returns (address, uint256) {
    uint256 scaledAmount = _loans[loanId].scaledAmount;
    if (scaledAmount == 0) {
      return (_loans[loanId].reserveAsset, 0);
    }
    uint256 amount = scaledAmount.rayMul(_getLendPool().getReserveNormalizedVariableDebt(_loans[loanId].reserveAsset));
    return (_loans[loanId].reserveAsset, amount);
  }
  function getLoanReserveBorrowScaledAmount(uint256 loanId) external view override returns (address, uint256) {
    return (_loans[loanId].reserveAsset, _loans[loanId].scaledAmount);
  }
  function getLoanHighestBid(uint256 loanId) external view override returns (address, uint256) {
    return (_loans[loanId].bidderAddress, _loans[loanId].bidPrice);
  }
  function getNftCollateralAmount(address nftAsset) external view override returns (uint256) {
    return _nftTotalCollateral[nftAsset];
  }
  function getUserNftCollateralAmount(address user, address nftAsset) external view override returns (uint256) {
    return _userNftCollateral[user][nftAsset];
  }
  function _getLendPool() internal view returns (ILendPool) {
    return ILendPool(_addressesProvider.getLendPool());
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {Errors} from "../helpers/Errors.sol";
/**
 * @title WadRayMath library
 * @author Bend
 * @dev Provides mul and div function for wads (decimal numbers with 18 digits precision) and rays (decimals with 27 digits)
 **/
library WadRayMath {
  uint256 internal constant WAD = 1e18;
  uint256 internal constant HALF_WAD = WAD / 2;
  uint256 internal constant RAY = 1e27;
  uint256 internal constant HALF_RAY = RAY / 2;
  uint256 internal constant WAD_RAY_RATIO = 1e9;
  /**
   * @return One ray, 1e27
   **/
  function ray() internal pure returns (uint256) {
    return RAY;
  }
  /**
   * @return One wad, 1e18
   **/
  function wad() internal pure returns (uint256) {
    return WAD;
  }
  /**
   * @return Half ray, 1e27/2
   **/
  function halfRay() internal pure returns (uint256) {
    return HALF_RAY;
  }
  /**
   * @return Half ray, 1e18/2
   **/
  function halfWad() internal pure returns (uint256) {
    return HALF_WAD;
  }
  /**
   * @dev Multiplies two wad, rounding half up to the nearest wad
   * @param a Wad
   * @param b Wad
   * @return The result of a*b, in wad
   **/
  function wadMul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0 || b == 0) {
      return 0;
    }
    require(a <= (type(uint256).max - HALF_WAD) / b, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (a * b + HALF_WAD) / WAD;
  }
  /**
   * @dev Divides two wad, rounding half up to the nearest wad
   * @param a Wad
   * @param b Wad
   * @return The result of a/b, in wad
   **/
  function wadDiv(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0, Errors.MATH_DIVISION_BY_ZERO);
    uint256 halfB = b / 2;
    require(a <= (type(uint256).max - halfB) / WAD, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (a * WAD + halfB) / b;
  }
  /**
   * @dev Multiplies two ray, rounding half up to the nearest ray
   * @param a Ray
   * @param b Ray
   * @return The result of a*b, in ray
   **/
  function rayMul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0 || b == 0) {
      return 0;
    }
    require(a <= (type(uint256).max - HALF_RAY) / b, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (a * b + HALF_RAY) / RAY;
  }
  /**
   * @dev Divides two ray, rounding half up to the nearest ray
   * @param a Ray
   * @param b Ray
   * @return The result of a/b, in ray
   **/
  function rayDiv(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0, Errors.MATH_DIVISION_BY_ZERO);
    uint256 halfB = b / 2;
    require(a <= (type(uint256).max - halfB) / RAY, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (a * RAY + halfB) / b;
  }
  /**
   * @dev Casts ray down to wad
   * @param a Ray
   * @return a casted to wad, rounded half up to the nearest wad
   **/
  function rayToWad(uint256 a) internal pure returns (uint256) {
    uint256 halfRatio = WAD_RAY_RATIO / 2;
    uint256 result = halfRatio + a;
    require(result >= halfRatio, Errors.MATH_ADDITION_OVERFLOW);
    return result / WAD_RAY_RATIO;
  }
  /**
   * @dev Converts wad up to ray
   * @param a Wad
   * @return a converted in ray
   **/
  function wadToRay(uint256 a) internal pure returns (uint256) {
    uint256 result = a * WAD_RAY_RATIO;
    require(result / WAD_RAY_RATIO == a, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return result;
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)
pragma solidity ^0.8.0;
/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library CountersUpgradeable {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }
    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }
    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }
    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }
    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IBToken} from "../interfaces/IBToken.sol";
import {IDebtToken} from "../interfaces/IDebtToken.sol";
import {ILendPoolLoan} from "../interfaces/ILendPoolLoan.sol";
import {ILendPoolLiquidator} from "../interfaces/ILendPoolLiquidator.sol";
import {INFTOracleGetter} from "../interfaces/INFTOracleGetter.sol";
import {Errors} from "../libraries/helpers/Errors.sol";
import {WadRayMath} from "../libraries/math/WadRayMath.sol";
import {GenericLogic} from "../libraries/logic/GenericLogic.sol";
import {PercentageMath} from "../libraries/math/PercentageMath.sol";
import {ReserveLogic} from "../libraries/logic/ReserveLogic.sol";
import {NftLogic} from "../libraries/logic/NftLogic.sol";
import {ValidationLogic} from "../libraries/logic/ValidationLogic.sol";
import {ReserveConfiguration} from "../libraries/configuration/ReserveConfiguration.sol";
import {NftConfiguration} from "../libraries/configuration/NftConfiguration.sol";
import {DataTypes} from "../libraries/types/DataTypes.sol";
import {LendPoolStorage} from "./LendPoolStorage.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
import {IERC721Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
import {Initializable} from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import {ContextUpgradeable} from "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";
/**
 * @title LendPoolLiquidator contract
 * @dev Implements the actions involving management of liquidation in the Bend Protocol
 * - Users can:
 *   # Auction
 *   # Redeem
 *   # Liquidate
 * IMPORTANT This contract will run always via DELEGATECALL, through the LendPool, so the chain of inheritance
 * is the same as the LendPool, to have compatible storage layouts
 * @author Bend
 **/
contract LendPoolLiquidator is Initializable, ILendPoolLiquidator, LendPoolStorage, ContextUpgradeable {
  using WadRayMath for uint256;
  using PercentageMath for uint256;
  using SafeERC20Upgradeable for IERC20Upgradeable;
  using ReserveLogic for DataTypes.ReserveData;
  using NftLogic for DataTypes.NftData;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  using NftConfiguration for DataTypes.NftConfigurationMap;
  struct AuctionLocalVars {
    address loanAddress;
    address initiator;
    uint256 loanId;
    uint256 thresholdPrice;
    uint256 liquidatePrice;
    uint256 borrowAmount;
    uint256 auctionEndTimestamp;
    uint256 minBidDelta;
  }
  /**
   * @dev Function to auction a non-healthy position collateral-wise
   * - The bidder want to buy collateral asset of the user getting liquidated
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param bidPrice The bid price of the bidder want to buy underlying NFT
   * @param onBehalfOf Address of the user who will get the underlying NFT, same as msg.sender if the user
   *   wants to receive them on his own wallet, or a different address if the beneficiary of NFT
   *   is a different wallet
   **/
  function auction(
    address nftAsset,
    uint256 nftTokenId,
    uint256 bidPrice,
    address onBehalfOf
  ) external override {
    require(onBehalfOf != address(0), Errors.VL_INVALID_ONBEHALFOF_ADDRESS);
    AuctionLocalVars memory vars;
    vars.initiator = _msgSender();
    vars.loanAddress = _addressesProvider.getLendPoolLoan();
    vars.loanId = ILendPoolLoan(vars.loanAddress).getCollateralLoanId(nftAsset, nftTokenId);
    require(vars.loanId != 0, Errors.LP_NFT_IS_NOT_USED_AS_COLLATERAL);
    DataTypes.LoanData memory loanData = ILendPoolLoan(vars.loanAddress).getLoan(vars.loanId);
    DataTypes.ReserveData storage reserveData = _reserves[loanData.reserveAsset];
    DataTypes.NftData storage nftData = _nfts[loanData.nftAsset];
    ValidationLogic.validateAuction(reserveData, nftData, loanData, bidPrice);
    // update state MUST BEFORE get borrow amount which is depent on latest borrow index
    reserveData.updateState();
    (vars.borrowAmount, vars.thresholdPrice, vars.liquidatePrice) = GenericLogic.calculateLoanLiquidatePrice(
      vars.loanId,
      loanData.reserveAsset,
      reserveData,
      loanData.nftAsset,
      nftData,
      vars.loanAddress,
      _addressesProvider.getReserveOracle(),
      _addressesProvider.getNFTOracle()
    );
    // first time bid need to burn debt tokens and transfer reserve to bTokens
    if (loanData.state == DataTypes.LoanState.Active) {
      // loan's accumulated debt must exceed threshold (heath factor below 1.0)
      require(vars.borrowAmount > vars.thresholdPrice, Errors.LP_BORROW_NOT_EXCEED_LIQUIDATION_THRESHOLD);
      // bid price must greater than liquidate price
      require(bidPrice >= vars.liquidatePrice, Errors.LPL_BID_PRICE_LESS_THAN_LIQUIDATION_PRICE);
      // bid price must greater than borrow debt
      require(bidPrice >= vars.borrowAmount, Errors.LPL_BID_PRICE_LESS_THAN_BORROW);
    } else {
      // bid price must greater than borrow debt
      require(bidPrice >= vars.borrowAmount, Errors.LPL_BID_PRICE_LESS_THAN_BORROW);
      vars.auctionEndTimestamp = loanData.bidStartTimestamp + (nftData.configuration.getAuctionDuration() * 1 days);
      require(block.timestamp <= vars.auctionEndTimestamp, Errors.LPL_BID_AUCTION_DURATION_HAS_END);
      // bid price must greater than highest bid + delta
      vars.minBidDelta = vars.borrowAmount.percentMul(PercentageMath.ONE_PERCENT);
      require(bidPrice >= (loanData.bidPrice + vars.minBidDelta), Errors.LPL_BID_PRICE_LESS_THAN_HIGHEST_PRICE);
    }
    ILendPoolLoan(vars.loanAddress).auctionLoan(
      vars.initiator,
      vars.loanId,
      onBehalfOf,
      bidPrice,
      vars.borrowAmount,
      reserveData.variableBorrowIndex
    );
    // lock highest bidder bid price amount to lend pool
    IERC20Upgradeable(loanData.reserveAsset).safeTransferFrom(vars.initiator, address(this), bidPrice);
    // transfer (return back) last bid price amount to previous bidder from lend pool
    if (loanData.bidderAddress != address(0)) {
      IERC20Upgradeable(loanData.reserveAsset).safeTransfer(loanData.bidderAddress, loanData.bidPrice);
    }
    // update interest rate according latest borrow amount (utilizaton)
    reserveData.updateInterestRates(loanData.reserveAsset, reserveData.bTokenAddress, 0, 0);
    emit Auction(
      vars.initiator,
      loanData.reserveAsset,
      bidPrice,
      nftAsset,
      nftTokenId,
      onBehalfOf,
      loanData.borrower,
      vars.loanId
    );
  }
  struct RedeemLocalVars {
    address initiator;
    address poolLoan;
    uint256 loanId;
    uint256 borrowAmount;
    uint256 repayAmount;
    uint256 minRepayAmount;
    uint256 maxRepayAmount;
    uint256 bidFine;
    uint256 redeemEndTimestamp;
  }
  /**
   * @notice Redeem a NFT loan which state is in Auction
   * - E.g. User repays 100 USDC, burning loan and receives collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param amount The amount to repay the debt
   * @param bidFine The amount of bid fine
   **/
  function redeem(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount,
    uint256 bidFine
  ) external override returns (uint256) {
    RedeemLocalVars memory vars;
    vars.initiator = _msgSender();
    vars.poolLoan = _addressesProvider.getLendPoolLoan();
    vars.loanId = ILendPoolLoan(vars.poolLoan).getCollateralLoanId(nftAsset, nftTokenId);
    require(vars.loanId != 0, Errors.LP_NFT_IS_NOT_USED_AS_COLLATERAL);
    DataTypes.LoanData memory loanData = ILendPoolLoan(vars.poolLoan).getLoan(vars.loanId);
    DataTypes.ReserveData storage reserveData = _reserves[loanData.reserveAsset];
    DataTypes.NftData storage nftData = _nfts[loanData.nftAsset];
    ValidationLogic.validateRedeem(reserveData, nftData, loanData, amount);
    vars.redeemEndTimestamp = (loanData.bidStartTimestamp + nftData.configuration.getRedeemDuration() * 1 days);
    require(block.timestamp <= vars.redeemEndTimestamp, Errors.LPL_BID_REDEEM_DURATION_HAS_END);
    // update state MUST BEFORE get borrow amount which is depent on latest borrow index
    reserveData.updateState();
    (vars.borrowAmount, , ) = GenericLogic.calculateLoanLiquidatePrice(
      vars.loanId,
      loanData.reserveAsset,
      reserveData,
      loanData.nftAsset,
      nftData,
      vars.poolLoan,
      _addressesProvider.getReserveOracle(),
      _addressesProvider.getNFTOracle()
    );
    // check bid fine
    vars.bidFine = vars.borrowAmount.percentMul(nftData.configuration.getRedeemFine());
    require(vars.bidFine <= bidFine, Errors.LPL_BID_INVALID_BID_FINE);
    // check the minimum debt repay amount, use redeem threshold in config
    vars.repayAmount = amount;
    vars.minRepayAmount = vars.borrowAmount.percentMul(nftData.configuration.getRedeemThreshold());
    require(vars.repayAmount >= vars.minRepayAmount, Errors.LP_AMOUNT_LESS_THAN_REDEEM_THRESHOLD);
    // check the maxinmum debt repay amount, 90%?
    vars.maxRepayAmount = vars.borrowAmount.percentMul(PercentageMath.PERCENTAGE_FACTOR - PercentageMath.TEN_PERCENT);
    require(vars.repayAmount <= vars.maxRepayAmount, Errors.LP_AMOUNT_GREATER_THAN_MAX_REPAY);
    ILendPoolLoan(vars.poolLoan).redeemLoan(
      vars.initiator,
      vars.loanId,
      vars.repayAmount,
      reserveData.variableBorrowIndex
    );
    IDebtToken(reserveData.debtTokenAddress).burn(loanData.borrower, vars.repayAmount, reserveData.variableBorrowIndex);
    // update interest rate according latest borrow amount (utilizaton)
    reserveData.updateInterestRates(loanData.reserveAsset, reserveData.bTokenAddress, vars.repayAmount, 0);
    // transfer repay amount from borrower to bToken
    IERC20Upgradeable(loanData.reserveAsset).safeTransferFrom(
      vars.initiator,
      reserveData.bTokenAddress,
      vars.repayAmount
    );
    if (loanData.bidderAddress != address(0)) {
      // transfer (return back) last bid price amount from lend pool to bidder
      IERC20Upgradeable(loanData.reserveAsset).safeTransfer(loanData.bidderAddress, loanData.bidPrice);
      // transfer bid penalty fine amount from borrower to bidder
      IERC20Upgradeable(loanData.reserveAsset).safeTransferFrom(vars.initiator, loanData.bidderAddress, vars.bidFine);
    }
    emit Redeem(
      vars.initiator,
      loanData.reserveAsset,
      vars.repayAmount,
      vars.bidFine,
      loanData.nftAsset,
      loanData.nftTokenId,
      loanData.borrower,
      vars.loanId
    );
    return (vars.repayAmount + vars.bidFine);
  }
  struct LiquidateLocalVars {
    address poolLoan;
    address initiator;
    uint256 loanId;
    uint256 borrowAmount;
    uint256 extraDebtAmount;
    uint256 remainAmount;
    uint256 auctionEndTimestamp;
  }
  /**
   * @dev Function to liquidate a non-healthy position collateral-wise
   * - The bidder buy collateral asset of the user getting liquidated, and receives
   *   the collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   **/
  function liquidate(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount
  ) external override returns (uint256) {
    LiquidateLocalVars memory vars;
    vars.initiator = _msgSender();
    vars.poolLoan = _addressesProvider.getLendPoolLoan();
    vars.loanId = ILendPoolLoan(vars.poolLoan).getCollateralLoanId(nftAsset, nftTokenId);
    require(vars.loanId != 0, Errors.LP_NFT_IS_NOT_USED_AS_COLLATERAL);
    DataTypes.LoanData memory loanData = ILendPoolLoan(vars.poolLoan).getLoan(vars.loanId);
    DataTypes.ReserveData storage reserveData = _reserves[loanData.reserveAsset];
    DataTypes.NftData storage nftData = _nfts[loanData.nftAsset];
    ValidationLogic.validateLiquidate(reserveData, nftData, loanData);
    vars.auctionEndTimestamp = loanData.bidStartTimestamp + (nftData.configuration.getAuctionDuration() * 1 days);
    require(block.timestamp > vars.auctionEndTimestamp, Errors.LPL_BID_AUCTION_DURATION_NOT_END);
    // update state MUST BEFORE get borrow amount which is depent on latest borrow index
    reserveData.updateState();
    (vars.borrowAmount, , ) = GenericLogic.calculateLoanLiquidatePrice(
      vars.loanId,
      loanData.reserveAsset,
      reserveData,
      loanData.nftAsset,
      nftData,
      vars.poolLoan,
      _addressesProvider.getReserveOracle(),
      _addressesProvider.getNFTOracle()
    );
    // Last bid price can not cover borrow amount
    if (loanData.bidPrice < vars.borrowAmount) {
      vars.extraDebtAmount = vars.borrowAmount - loanData.bidPrice;
      require(amount >= vars.extraDebtAmount, Errors.LP_AMOUNT_LESS_THAN_EXTRA_DEBT);
    }
    if (loanData.bidPrice > vars.borrowAmount) {
      vars.remainAmount = loanData.bidPrice - vars.borrowAmount;
    }
    ILendPoolLoan(vars.poolLoan).liquidateLoan(
      loanData.bidderAddress,
      vars.loanId,
      nftData.bNftAddress,
      vars.borrowAmount,
      reserveData.variableBorrowIndex
    );
    IDebtToken(reserveData.debtTokenAddress).burn(
      loanData.borrower,
      vars.borrowAmount,
      reserveData.variableBorrowIndex
    );
    // update interest rate according latest borrow amount (utilizaton)
    reserveData.updateInterestRates(loanData.reserveAsset, reserveData.bTokenAddress, vars.borrowAmount, 0);
    // transfer extra borrow amount from liquidator to lend pool
    if (vars.extraDebtAmount > 0) {
      IERC20Upgradeable(loanData.reserveAsset).safeTransferFrom(vars.initiator, address(this), vars.extraDebtAmount);
    }
    // transfer borrow amount from lend pool to bToken, repay debt
    IERC20Upgradeable(loanData.reserveAsset).safeTransfer(reserveData.bTokenAddress, vars.borrowAmount);
    // transfer remain amount to borrower
    if (vars.remainAmount > 0) {
      IERC20Upgradeable(loanData.reserveAsset).safeTransfer(loanData.borrower, vars.remainAmount);
    }
    // transfer erc721 to bidder
    IERC721Upgradeable(loanData.nftAsset).safeTransferFrom(address(this), loanData.bidderAddress, nftTokenId);
    emit Liquidate(
      vars.initiator,
      loanData.reserveAsset,
      vars.borrowAmount,
      vars.remainAmount,
      loanData.nftAsset,
      loanData.nftTokenId,
      loanData.borrower,
      vars.loanId
    );
    return (vars.extraDebtAmount);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {DataTypes} from "../libraries/types/DataTypes.sol";
interface ILendPoolLiquidator {
  // Following events copy from LendPool
  /**
   * @dev Emitted when a borrower's loan is auctioned.
   * @param user The address of the user initiating the auction
   * @param reserve The address of the underlying asset of the reserve
   * @param bidPrice The price of the underlying reserve given by the bidder
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param onBehalfOf The address that will be getting the NFT
   * @param loanId The loan ID of the NFT loans
   **/
  event Auction(
    address user,
    address indexed reserve,
    uint256 bidPrice,
    address indexed nftAsset,
    uint256 nftTokenId,
    address onBehalfOf,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted on redeem()
   * @param user The address of the user initiating the redeem(), providing the funds
   * @param reserve The address of the underlying asset of the reserve
   * @param borrowAmount The borrow amount repaid
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param loanId The loan ID of the NFT loans
   **/
  event Redeem(
    address user,
    address indexed reserve,
    uint256 borrowAmount,
    uint256 fineAmount,
    address indexed nftAsset,
    uint256 nftTokenId,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted when a borrower's loan is liquidated.
   * @param user The address of the user initiating the auction
   * @param reserve The address of the underlying asset of the reserve
   * @param repayAmount The amount of reserve repaid by the liquidator
   * @param remainAmount The amount of reserve received by the borrower
   * @param loanId The loan ID of the NFT loans
   **/
  event Liquidate(
    address user,
    address indexed reserve,
    uint256 repayAmount,
    uint256 remainAmount,
    address indexed nftAsset,
    uint256 nftTokenId,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Function to auction a non-healthy position collateral-wise
   * - The caller (liquidator) want to buy collateral asset of the user getting liquidated
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param bidPrice The bid price of the liquidator want to buy the underlying NFT
   * @param onBehalfOf Address of the user who will get the underlying NFT, same as msg.sender if the user
   *   wants to receive them on his own wallet, or a different address if the beneficiary of NFT
   *   is a different wallet
   **/
  function auction(
    address nftAsset,
    uint256 nftTokenId,
    uint256 bidPrice,
    address onBehalfOf
  ) external;
  /**
   * @notice Redeem a NFT loan which state is in Auction
   * - E.g. User repays 100 USDC, burning loan and receives collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param amount The amount to repay the debt
   * @param bidFine The amount of bid fine
   **/
  function redeem(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount,
    uint256 bidFine
  ) external returns (uint256);
  /**
   * @dev Function to liquidate a non-healthy position collateral-wise
   * - The caller (liquidator) buy collateral asset of the user getting liquidated, and receives
   *   the collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   **/
  function liquidate(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount
  ) external returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/************
@title INFTOracleGetter interface
@notice Interface for getting NFT price oracle.*/
interface INFTOracleGetter {
  /* CAUTION: Price uint is ETH based (WEI, 18 decimals) */
  /***********
    @dev returns the asset price in ETH
     */
  function getAssetPrice(address asset) external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ILendPoolLoan} from "../../interfaces/ILendPoolLoan.sol";
import {IReserveOracleGetter} from "../../interfaces/IReserveOracleGetter.sol";
import {INFTOracleGetter} from "../../interfaces/INFTOracleGetter.sol";
import {WadRayMath} from "../math/WadRayMath.sol";
import {PercentageMath} from "../math/PercentageMath.sol";
import {ReserveConfiguration} from "../configuration/ReserveConfiguration.sol";
import {NftConfiguration} from "../configuration/NftConfiguration.sol";
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
import {ReserveLogic} from "./ReserveLogic.sol";
/**
 * @title GenericLogic library
 * @author Bend
 * @notice Implements protocol-level logic to calculate and validate the state of a user
 */
library GenericLogic {
  using ReserveLogic for DataTypes.ReserveData;
  using WadRayMath for uint256;
  using PercentageMath for uint256;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  using NftConfiguration for DataTypes.NftConfigurationMap;
  uint256 public constant HEALTH_FACTOR_LIQUIDATION_THRESHOLD = 1 ether;
  struct CalculateLoanDataVars {
    uint256 reserveUnitPrice;
    uint256 reserveUnit;
    uint256 reserveDecimals;
    uint256 healthFactor;
    uint256 totalCollateralInETH;
    uint256 totalCollateralInReserve;
    uint256 totalDebtInETH;
    uint256 totalDebtInReserve;
    uint256 nftLtv;
    uint256 nftLiquidationThreshold;
    address nftAsset;
    uint256 nftTokenId;
    uint256 nftUnitPrice;
  }
  /**
   * @dev Calculates the nft loan data.
   * this includes the total collateral/borrow balances in Reserve,
   * the Loan To Value, the Liquidation Ratio, and the Health factor.
   * @param reserveData Data of the reserve
   * @param nftData Data of the nft
   * @param reserveOracle The price oracle address of reserve
   * @param nftOracle The price oracle address of nft
   * @return The total collateral and total debt of the loan in Reserve, the ltv, liquidation threshold and the HF
   **/
  function calculateLoanData(
    address reserveAddress,
    DataTypes.ReserveData storage reserveData,
    address nftAddress,
    DataTypes.NftData storage nftData,
    address loanAddress,
    uint256 loanId,
    address reserveOracle,
    address nftOracle
  )
    internal
    view
    returns (
      uint256,
      uint256,
      uint256
    )
  {
    CalculateLoanDataVars memory vars;
    (vars.nftLtv, vars.nftLiquidationThreshold, ) = nftData.configuration.getCollateralParams();
    // calculate total borrow balance for the loan
    if (loanId != 0) {
      (vars.totalDebtInETH, vars.totalDebtInReserve) = calculateNftDebtData(
        reserveAddress,
        reserveData,
        loanAddress,
        loanId,
        reserveOracle
      );
    }
    // calculate total collateral balance for the nft
    (vars.totalCollateralInETH, vars.totalCollateralInReserve) = calculateNftCollateralData(
      reserveAddress,
      reserveData,
      nftAddress,
      nftData,
      reserveOracle,
      nftOracle
    );
    // calculate health by borrow and collateral
    vars.healthFactor = calculateHealthFactorFromBalances(
      vars.totalCollateralInReserve,
      vars.totalDebtInReserve,
      vars.nftLiquidationThreshold
    );
    return (vars.totalCollateralInReserve, vars.totalDebtInReserve, vars.healthFactor);
  }
  function calculateNftDebtData(
    address reserveAddress,
    DataTypes.ReserveData storage reserveData,
    address loanAddress,
    uint256 loanId,
    address reserveOracle
  ) internal view returns (uint256, uint256) {
    CalculateLoanDataVars memory vars;
    // all asset price has converted to ETH based, unit is in WEI (18 decimals)
    vars.reserveDecimals = reserveData.configuration.getDecimals();
    vars.reserveUnit = 10**vars.reserveDecimals;
    vars.reserveUnitPrice = IReserveOracleGetter(reserveOracle).getAssetPrice(reserveAddress);
    (, vars.totalDebtInReserve) = ILendPoolLoan(loanAddress).getLoanReserveBorrowAmount(loanId);
    vars.totalDebtInETH = (vars.totalDebtInReserve * vars.reserveUnitPrice) / vars.reserveUnit;
    return (vars.totalDebtInETH, vars.totalDebtInReserve);
  }
  function calculateNftCollateralData(
    address reserveAddress,
    DataTypes.ReserveData storage reserveData,
    address nftAddress,
    DataTypes.NftData storage nftData,
    address reserveOracle,
    address nftOracle
  ) internal view returns (uint256, uint256) {
    reserveData;
    nftData;
    CalculateLoanDataVars memory vars;
    // calculate total collateral balance for the nft
    // all asset price has converted to ETH based, unit is in WEI (18 decimals)
    vars.nftUnitPrice = INFTOracleGetter(nftOracle).getAssetPrice(nftAddress);
    vars.totalCollateralInETH = vars.nftUnitPrice;
    if (reserveAddress != address(0)) {
      vars.reserveDecimals = reserveData.configuration.getDecimals();
      vars.reserveUnit = 10**vars.reserveDecimals;
      vars.reserveUnitPrice = IReserveOracleGetter(reserveOracle).getAssetPrice(reserveAddress);
      vars.totalCollateralInReserve = (vars.totalCollateralInETH * vars.reserveUnit) / vars.reserveUnitPrice;
    }
    return (vars.totalCollateralInETH, vars.totalCollateralInReserve);
  }
  /**
   * @dev Calculates the health factor from the corresponding balances
   * @param totalCollateral The total collateral
   * @param totalDebt The total debt
   * @param liquidationThreshold The avg liquidation threshold
   * @return The health factor calculated from the balances provided
   **/
  function calculateHealthFactorFromBalances(
    uint256 totalCollateral,
    uint256 totalDebt,
    uint256 liquidationThreshold
  ) internal pure returns (uint256) {
    if (totalDebt == 0) return type(uint256).max;
    return (totalCollateral.percentMul(liquidationThreshold)).wadDiv(totalDebt);
  }
  /**
   * @dev Calculates the equivalent amount that an user can borrow, depending on the available collateral and the
   * average Loan To Value
   * @param totalCollateral The total collateral
   * @param totalDebt The total borrow balance
   * @param ltv The average loan to value
   * @return the amount available to borrow for the user
   **/
  function calculateAvailableBorrows(
    uint256 totalCollateral,
    uint256 totalDebt,
    uint256 ltv
  ) internal pure returns (uint256) {
    uint256 availableBorrows = totalCollateral.percentMul(ltv);
    if (availableBorrows < totalDebt) {
      return 0;
    }
    availableBorrows = availableBorrows - totalDebt;
    return availableBorrows;
  }
  struct CalcLiquidatePriceLocalVars {
    uint256 ltv;
    uint256 liquidationThreshold;
    uint256 liquidationBonus;
    uint256 nftPriceInETH;
    uint256 nftPriceInReserve;
    uint256 reserveDecimals;
    uint256 reservePriceInETH;
    uint256 thresholdPrice;
    uint256 liquidatePrice;
    uint256 borrowAmount;
  }
  function calculateLoanLiquidatePrice(
    uint256 loanId,
    address reserveAsset,
    DataTypes.ReserveData storage reserveData,
    address nftAsset,
    DataTypes.NftData storage nftData,
    address poolLoan,
    address reserveOracle,
    address nftOracle
  )
    internal
    view
    returns (
      uint256,
      uint256,
      uint256
    )
  {
    CalcLiquidatePriceLocalVars memory vars;
    /*
     * 0                   CR                  LH                  100
     * |___________________|___________________|___________________|
     *  <       Borrowing with Interest        <
     * CR: Callteral Ratio;
     * LH: Liquidate Threshold;
     * Liquidate Trigger: Borrowing with Interest > thresholdPrice;
     * Liquidate Price: (100% - BonusRatio) * NFT Price;
     */
    vars.reserveDecimals = reserveData.configuration.getDecimals();
    (, vars.borrowAmount) = ILendPoolLoan(poolLoan).getLoanReserveBorrowAmount(loanId);
    (vars.ltv, vars.liquidationThreshold, vars.liquidationBonus) = nftData.configuration.getCollateralParams();
    vars.nftPriceInETH = INFTOracleGetter(nftOracle).getAssetPrice(nftAsset);
    vars.reservePriceInETH = IReserveOracleGetter(reserveOracle).getAssetPrice(reserveAsset);
    vars.nftPriceInReserve = ((10**vars.reserveDecimals) * vars.nftPriceInETH) / vars.reservePriceInETH;
    vars.thresholdPrice = vars.nftPriceInReserve.percentMul(vars.liquidationThreshold);
    vars.liquidatePrice = vars.nftPriceInReserve.percentMul(PercentageMath.PERCENTAGE_FACTOR - vars.liquidationBonus);
    return (vars.borrowAmount, vars.thresholdPrice, vars.liquidatePrice);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IBToken} from "../../interfaces/IBToken.sol";
import {IDebtToken} from "../../interfaces/IDebtToken.sol";
import {IInterestRate} from "../../interfaces/IInterestRate.sol";
import {ReserveConfiguration} from "../configuration/ReserveConfiguration.sol";
import {MathUtils} from "../math/MathUtils.sol";
import {WadRayMath} from "../math/WadRayMath.sol";
import {PercentageMath} from "../math/PercentageMath.sol";
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
/**
 * @title ReserveLogic library
 * @author Bend
 * @notice Implements the logic to update the reserves state
 */
library ReserveLogic {
  using WadRayMath for uint256;
  using PercentageMath for uint256;
  using SafeERC20Upgradeable for IERC20Upgradeable;
  /**
   * @dev Emitted when the state of a reserve is updated
   * @param asset The address of the underlying asset of the reserve
   * @param liquidityRate The new liquidity rate
   * @param variableBorrowRate The new variable borrow rate
   * @param liquidityIndex The new liquidity index
   * @param variableBorrowIndex The new variable borrow index
   **/
  event ReserveDataUpdated(
    address indexed asset,
    uint256 liquidityRate,
    uint256 variableBorrowRate,
    uint256 liquidityIndex,
    uint256 variableBorrowIndex
  );
  using ReserveLogic for DataTypes.ReserveData;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  /**
   * @dev Returns the ongoing normalized income for the reserve
   * A value of 1e27 means there is no income. As time passes, the income is accrued
   * A value of 2*1e27 means for each unit of asset one unit of income has been accrued
   * @param reserve The reserve object
   * @return the normalized income. expressed in ray
   **/
  function getNormalizedIncome(DataTypes.ReserveData storage reserve) internal view returns (uint256) {
    uint40 timestamp = reserve.lastUpdateTimestamp;
    //solium-disable-next-line
    if (timestamp == uint40(block.timestamp)) {
      //if the index was updated in the same block, no need to perform any calculation
      return reserve.liquidityIndex;
    }
    uint256 cumulated = MathUtils.calculateLinearInterest(reserve.currentLiquidityRate, timestamp).rayMul(
      reserve.liquidityIndex
    );
    return cumulated;
  }
  /**
   * @dev Returns the ongoing normalized variable debt for the reserve
   * A value of 1e27 means there is no debt. As time passes, the income is accrued
   * A value of 2*1e27 means that for each unit of debt, one unit worth of interest has been accumulated
   * @param reserve The reserve object
   * @return The normalized variable debt. expressed in ray
   **/
  function getNormalizedDebt(DataTypes.ReserveData storage reserve) internal view returns (uint256) {
    uint40 timestamp = reserve.lastUpdateTimestamp;
    //solium-disable-next-line
    if (timestamp == uint40(block.timestamp)) {
      //if the index was updated in the same block, no need to perform any calculation
      return reserve.variableBorrowIndex;
    }
    uint256 cumulated = MathUtils.calculateCompoundedInterest(reserve.currentVariableBorrowRate, timestamp).rayMul(
      reserve.variableBorrowIndex
    );
    return cumulated;
  }
  /**
   * @dev Updates the liquidity cumulative index and the variable borrow index.
   * @param reserve the reserve object
   **/
  function updateState(DataTypes.ReserveData storage reserve) internal {
    uint256 scaledVariableDebt = IDebtToken(reserve.debtTokenAddress).scaledTotalSupply();
    uint256 previousVariableBorrowIndex = reserve.variableBorrowIndex;
    uint256 previousLiquidityIndex = reserve.liquidityIndex;
    uint40 lastUpdatedTimestamp = reserve.lastUpdateTimestamp;
    (uint256 newLiquidityIndex, uint256 newVariableBorrowIndex) = _updateIndexes(
      reserve,
      scaledVariableDebt,
      previousLiquidityIndex,
      previousVariableBorrowIndex,
      lastUpdatedTimestamp
    );
    _mintToTreasury(
      reserve,
      scaledVariableDebt,
      previousVariableBorrowIndex,
      newLiquidityIndex,
      newVariableBorrowIndex,
      lastUpdatedTimestamp
    );
  }
  /**
   * @dev Accumulates a predefined amount of asset to the reserve as a fixed, instantaneous income. Used for example to accumulate
   * the flashloan fee to the reserve, and spread it between all the depositors
   * @param reserve The reserve object
   * @param totalLiquidity The total liquidity available in the reserve
   * @param amount The amount to accomulate
   **/
  function cumulateToLiquidityIndex(
    DataTypes.ReserveData storage reserve,
    uint256 totalLiquidity,
    uint256 amount
  ) internal {
    uint256 amountToLiquidityRatio = amount.wadToRay().rayDiv(totalLiquidity.wadToRay());
    uint256 result = amountToLiquidityRatio + (WadRayMath.ray());
    result = result.rayMul(reserve.liquidityIndex);
    require(result <= type(uint128).max, Errors.RL_LIQUIDITY_INDEX_OVERFLOW);
    reserve.liquidityIndex = uint128(result);
  }
  /**
   * @dev Initializes a reserve
   * @param reserve The reserve object
   * @param bTokenAddress The address of the overlying bToken contract
   * @param debtTokenAddress The address of the overlying debtToken contract
   * @param interestRateAddress The address of the interest rate strategy contract
   **/
  function init(
    DataTypes.ReserveData storage reserve,
    address bTokenAddress,
    address debtTokenAddress,
    address interestRateAddress
  ) external {
    require(reserve.bTokenAddress == address(0), Errors.RL_RESERVE_ALREADY_INITIALIZED);
    reserve.liquidityIndex = uint128(WadRayMath.ray());
    reserve.variableBorrowIndex = uint128(WadRayMath.ray());
    reserve.bTokenAddress = bTokenAddress;
    reserve.debtTokenAddress = debtTokenAddress;
    reserve.interestRateAddress = interestRateAddress;
  }
  struct UpdateInterestRatesLocalVars {
    uint256 availableLiquidity;
    uint256 newLiquidityRate;
    uint256 newVariableRate;
    uint256 totalVariableDebt;
  }
  /**
   * @dev Updates the reserve current stable borrow rate, the current variable borrow rate and the current liquidity rate
   * @param reserve The address of the reserve to be updated
   * @param liquidityAdded The amount of liquidity added to the protocol (deposit or repay) in the previous action
   * @param liquidityTaken The amount of liquidity taken from the protocol (withdraw or borrow)
   **/
  function updateInterestRates(
    DataTypes.ReserveData storage reserve,
    address reserveAddress,
    address bTokenAddress,
    uint256 liquidityAdded,
    uint256 liquidityTaken
  ) internal {
    UpdateInterestRatesLocalVars memory vars;
    //calculates the total variable debt locally using the scaled borrow amount instead
    //of borrow amount(), as it's noticeably cheaper. Also, the index has been
    //updated by the previous updateState() call
    vars.totalVariableDebt = IDebtToken(reserve.debtTokenAddress).scaledTotalSupply().rayMul(
      reserve.variableBorrowIndex
    );
    (vars.newLiquidityRate, vars.newVariableRate) = IInterestRate(reserve.interestRateAddress).calculateInterestRates(
      reserveAddress,
      bTokenAddress,
      liquidityAdded,
      liquidityTaken,
      vars.totalVariableDebt,
      reserve.configuration.getReserveFactor()
    );
    require(vars.newLiquidityRate <= type(uint128).max, Errors.RL_LIQUIDITY_RATE_OVERFLOW);
    require(vars.newVariableRate <= type(uint128).max, Errors.RL_VARIABLE_BORROW_RATE_OVERFLOW);
    reserve.currentLiquidityRate = uint128(vars.newLiquidityRate);
    reserve.currentVariableBorrowRate = uint128(vars.newVariableRate);
    emit ReserveDataUpdated(
      reserveAddress,
      vars.newLiquidityRate,
      vars.newVariableRate,
      reserve.liquidityIndex,
      reserve.variableBorrowIndex
    );
  }
  struct MintToTreasuryLocalVars {
    uint256 currentVariableDebt;
    uint256 previousVariableDebt;
    uint256 totalDebtAccrued;
    uint256 amountToMint;
    uint256 reserveFactor;
  }
  /**
   * @dev Mints part of the repaid interest to the reserve treasury as a function of the reserveFactor for the
   * specific asset.
   * @param reserve The reserve reserve to be updated
   * @param scaledVariableDebt The current scaled total variable debt
   * @param previousVariableBorrowIndex The variable borrow index before the last accumulation of the interest
   * @param newLiquidityIndex The new liquidity index
   * @param newVariableBorrowIndex The variable borrow index after the last accumulation of the interest
   **/
  function _mintToTreasury(
    DataTypes.ReserveData storage reserve,
    uint256 scaledVariableDebt,
    uint256 previousVariableBorrowIndex,
    uint256 newLiquidityIndex,
    uint256 newVariableBorrowIndex,
    uint40 timestamp
  ) internal {
    timestamp;
    MintToTreasuryLocalVars memory vars;
    vars.reserveFactor = reserve.configuration.getReserveFactor();
    if (vars.reserveFactor == 0) {
      return;
    }
    //calculate the last principal variable debt
    vars.previousVariableDebt = scaledVariableDebt.rayMul(previousVariableBorrowIndex);
    //calculate the new total supply after accumulation of the index
    vars.currentVariableDebt = scaledVariableDebt.rayMul(newVariableBorrowIndex);
    //debt accrued is the sum of the current debt minus the sum of the debt at the last update
    vars.totalDebtAccrued = vars.currentVariableDebt - (vars.previousVariableDebt);
    vars.amountToMint = vars.totalDebtAccrued.percentMul(vars.reserveFactor);
    if (vars.amountToMint != 0) {
      IBToken(reserve.bTokenAddress).mintToTreasury(vars.amountToMint, newLiquidityIndex);
    }
  }
  /**
   * @dev Updates the reserve indexes and the timestamp of the update
   * @param reserve The reserve reserve to be updated
   * @param scaledVariableDebt The scaled variable debt
   * @param liquidityIndex The last stored liquidity index
   * @param variableBorrowIndex The last stored variable borrow index
   **/
  function _updateIndexes(
    DataTypes.ReserveData storage reserve,
    uint256 scaledVariableDebt,
    uint256 liquidityIndex,
    uint256 variableBorrowIndex,
    uint40 timestamp
  ) internal returns (uint256, uint256) {
    uint256 currentLiquidityRate = reserve.currentLiquidityRate;
    uint256 newLiquidityIndex = liquidityIndex;
    uint256 newVariableBorrowIndex = variableBorrowIndex;
    //only cumulating if there is any income being produced
    if (currentLiquidityRate > 0) {
      uint256 cumulatedLiquidityInterest = MathUtils.calculateLinearInterest(currentLiquidityRate, timestamp);
      newLiquidityIndex = cumulatedLiquidityInterest.rayMul(liquidityIndex);
      require(newLiquidityIndex <= type(uint128).max, Errors.RL_LIQUIDITY_INDEX_OVERFLOW);
      reserve.liquidityIndex = uint128(newLiquidityIndex);
      //as the liquidity rate might come only from stable rate loans, we need to ensure
      //that there is actual variable debt before accumulating
      if (scaledVariableDebt != 0) {
        uint256 cumulatedVariableBorrowInterest = MathUtils.calculateCompoundedInterest(
          reserve.currentVariableBorrowRate,
          timestamp
        );
        newVariableBorrowIndex = cumulatedVariableBorrowInterest.rayMul(variableBorrowIndex);
        require(newVariableBorrowIndex <= type(uint128).max, Errors.RL_VARIABLE_BORROW_INDEX_OVERFLOW);
        reserve.variableBorrowIndex = uint128(newVariableBorrowIndex);
      }
    }
    //solium-disable-next-line
    reserve.lastUpdateTimestamp = uint40(block.timestamp);
    return (newLiquidityIndex, newVariableBorrowIndex);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
/**
 * @title NftLogic library
 * @author Bend
 * @notice Implements the logic to update the nft state
 */
library NftLogic {
  /**
   * @dev Initializes a nft
   * @param nft The nft object
   * @param bNftAddress The address of the bNFT contract
   **/
  function init(DataTypes.NftData storage nft, address bNftAddress) external {
    require(nft.bNftAddress == address(0), Errors.RL_RESERVE_ALREADY_INITIALIZED);
    nft.bNftAddress = bNftAddress;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ReserveLogic} from "./ReserveLogic.sol";
import {GenericLogic} from "./GenericLogic.sol";
import {WadRayMath} from "../math/WadRayMath.sol";
import {PercentageMath} from "../math/PercentageMath.sol";
import {ReserveConfiguration} from "../configuration/ReserveConfiguration.sol";
import {NftConfiguration} from "../configuration/NftConfiguration.sol";
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
import {IInterestRate} from "../../interfaces/IInterestRate.sol";
import {ILendPoolLoan} from "../../interfaces/ILendPoolLoan.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
/**
 * @title ValidationLogic library
 * @author Bend
 * @notice Implements functions to validate the different actions of the protocol
 */
library ValidationLogic {
  using ReserveLogic for DataTypes.ReserveData;
  using WadRayMath for uint256;
  using PercentageMath for uint256;
  using SafeERC20Upgradeable for IERC20Upgradeable;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  using NftConfiguration for DataTypes.NftConfigurationMap;
  /**
   * @dev Validates a deposit action
   * @param reserve The reserve object on which the user is depositing
   * @param amount The amount to be deposited
   */
  function validateDeposit(DataTypes.ReserveData storage reserve, uint256 amount) external view {
    (bool isActive, bool isFrozen, , ) = reserve.configuration.getFlags();
    require(amount != 0, Errors.VL_INVALID_AMOUNT);
    require(isActive, Errors.VL_NO_ACTIVE_RESERVE);
    require(!isFrozen, Errors.VL_RESERVE_FROZEN);
  }
  /**
   * @dev Validates a withdraw action
   * @param reserveData The reserve state
   * @param amount The amount to be withdrawn
   * @param userBalance The balance of the user
   */
  function validateWithdraw(
    DataTypes.ReserveData storage reserveData,
    uint256 amount,
    uint256 userBalance
  ) external view {
    require(amount != 0, Errors.VL_INVALID_AMOUNT);
    require(amount <= userBalance, Errors.VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE);
    (bool isActive, , , ) = reserveData.configuration.getFlags();
    require(isActive, Errors.VL_NO_ACTIVE_RESERVE);
  }
  struct ValidateBorrowLocalVars {
    uint256 currentLtv;
    uint256 currentLiquidationThreshold;
    uint256 amountOfCollateralNeeded;
    uint256 userCollateralBalance;
    uint256 userBorrowBalance;
    uint256 availableLiquidity;
    uint256 healthFactor;
    bool isActive;
    bool isFrozen;
    bool borrowingEnabled;
    bool stableRateBorrowingEnabled;
    bool nftIsActive;
    bool nftIsFrozen;
    address loanReserveAsset;
    address loanBorrower;
  }
  /**
   * @dev Validates a borrow action
   * @param reserveAsset The address of the asset to borrow
   * @param amount The amount to be borrowed
   * @param reserveData The reserve state from which the user is borrowing
   * @param nftData The state of the user for the specific nft
   */
  function validateBorrow(
    address user,
    address reserveAsset,
    uint256 amount,
    DataTypes.ReserveData storage reserveData,
    address nftAsset,
    DataTypes.NftData storage nftData,
    address loanAddress,
    uint256 loanId,
    address reserveOracle,
    address nftOracle
  ) external view {
    ValidateBorrowLocalVars memory vars;
    require(reserveData.bTokenAddress != address(0), Errors.VL_INVALID_RESERVE_ADDRESS);
    require(nftData.bNftAddress != address(0), Errors.LPC_INVALIED_BNFT_ADDRESS);
    require(amount > 0, Errors.VL_INVALID_AMOUNT);
    if (loanId != 0) {
      DataTypes.LoanData memory loanData = ILendPoolLoan(loanAddress).getLoan(loanId);
      require(loanData.state == DataTypes.LoanState.Active, Errors.LPL_INVALID_LOAN_STATE);
      require(reserveAsset == loanData.reserveAsset, Errors.VL_SPECIFIED_RESERVE_NOT_BORROWED_BY_USER);
      require(user == loanData.borrower, Errors.VL_SPECIFIED_LOAN_NOT_BORROWED_BY_USER);
    }
    (vars.isActive, vars.isFrozen, vars.borrowingEnabled, vars.stableRateBorrowingEnabled) = reserveData
      .configuration
      .getFlags();
    require(vars.isActive, Errors.VL_NO_ACTIVE_RESERVE);
    require(!vars.isFrozen, Errors.VL_RESERVE_FROZEN);
    require(vars.borrowingEnabled, Errors.VL_BORROWING_NOT_ENABLED);
    (vars.nftIsActive, vars.nftIsFrozen) = nftData.configuration.getFlags();
    require(vars.nftIsActive, Errors.VL_NO_ACTIVE_NFT);
    require(!vars.nftIsFrozen, Errors.VL_NFT_FROZEN);
    (vars.currentLtv, vars.currentLiquidationThreshold, ) = nftData.configuration.getCollateralParams();
    (vars.userCollateralBalance, vars.userBorrowBalance, vars.healthFactor) = GenericLogic.calculateLoanData(
      reserveAsset,
      reserveData,
      nftAsset,
      nftData,
      loanAddress,
      loanId,
      reserveOracle,
      nftOracle
    );
    require(vars.userCollateralBalance > 0, Errors.VL_COLLATERAL_BALANCE_IS_0);
    require(
      vars.healthFactor > GenericLogic.HEALTH_FACTOR_LIQUIDATION_THRESHOLD,
      Errors.VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD
    );
    //add the current already borrowed amount to the amount requested to calculate the total collateral needed.
    //LTV is calculated in percentage
    vars.amountOfCollateralNeeded = (vars.userBorrowBalance + amount).percentDiv(vars.currentLtv);
    require(vars.amountOfCollateralNeeded <= vars.userCollateralBalance, Errors.VL_COLLATERAL_CANNOT_COVER_NEW_BORROW);
  }
  /**
   * @dev Validates a repay action
   * @param reserveData The reserve state from which the user is repaying
   * @param amountSent The amount sent for the repayment. Can be an actual value or uint(-1)
   * @param borrowAmount The borrow balance of the user
   */
  function validateRepay(
    DataTypes.ReserveData storage reserveData,
    DataTypes.NftData storage nftData,
    DataTypes.LoanData memory loanData,
    uint256 amountSent,
    uint256 borrowAmount
  ) external view {
    require(nftData.bNftAddress != address(0), Errors.LPC_INVALIED_BNFT_ADDRESS);
    require(reserveData.bTokenAddress != address(0), Errors.VL_INVALID_RESERVE_ADDRESS);
    require(reserveData.configuration.getActive(), Errors.VL_NO_ACTIVE_RESERVE);
    require(nftData.configuration.getActive(), Errors.VL_NO_ACTIVE_NFT);
    require(amountSent > 0, Errors.VL_INVALID_AMOUNT);
    require(borrowAmount > 0, Errors.VL_NO_DEBT_OF_SELECTED_TYPE);
    require(loanData.state == DataTypes.LoanState.Active, Errors.LPL_INVALID_LOAN_STATE);
  }
  /**
   * @dev Validates the auction action
   * @param reserveData The reserve data of the principal
   * @param nftData The nft data of the underlying nft
   * @param bidPrice Total variable debt balance of the user
   **/
  function validateAuction(
    DataTypes.ReserveData storage reserveData,
    DataTypes.NftData storage nftData,
    DataTypes.LoanData memory loanData,
    uint256 bidPrice
  ) internal view {
    require(nftData.bNftAddress != address(0), Errors.LPC_INVALIED_BNFT_ADDRESS);
    require(reserveData.bTokenAddress != address(0), Errors.VL_INVALID_RESERVE_ADDRESS);
    require(reserveData.configuration.getActive(), Errors.VL_NO_ACTIVE_RESERVE);
    require(nftData.configuration.getActive(), Errors.VL_NO_ACTIVE_NFT);
    require(
      loanData.state == DataTypes.LoanState.Active || loanData.state == DataTypes.LoanState.Auction,
      Errors.LPL_INVALID_LOAN_STATE
    );
    require(bidPrice > 0, Errors.VL_INVALID_AMOUNT);
  }
  /**
   * @dev Validates a redeem action
   * @param reserveData The reserve state
   * @param nftData The nft state
   */
  function validateRedeem(
    DataTypes.ReserveData storage reserveData,
    DataTypes.NftData storage nftData,
    DataTypes.LoanData memory loanData,
    uint256 amount
  ) external view {
    require(nftData.bNftAddress != address(0), Errors.LPC_INVALIED_BNFT_ADDRESS);
    require(reserveData.bTokenAddress != address(0), Errors.VL_INVALID_RESERVE_ADDRESS);
    require(reserveData.configuration.getActive(), Errors.VL_NO_ACTIVE_RESERVE);
    require(nftData.configuration.getActive(), Errors.VL_NO_ACTIVE_NFT);
    require(loanData.state == DataTypes.LoanState.Auction, Errors.LPL_INVALID_LOAN_STATE);
    require(loanData.bidderAddress != address(0), Errors.LPL_INVALID_BIDDER_ADDRESS);
    require(amount > 0, Errors.VL_INVALID_AMOUNT);
  }
  /**
   * @dev Validates the liquidation action
   * @param reserveData The reserve data of the principal
   * @param nftData The data of the underlying NFT
   * @param loanData The loan data of the underlying NFT
   **/
  function validateLiquidate(
    DataTypes.ReserveData storage reserveData,
    DataTypes.NftData storage nftData,
    DataTypes.LoanData memory loanData
  ) internal view {
    require(nftData.bNftAddress != address(0), Errors.LPC_INVALIED_BNFT_ADDRESS);
    require(reserveData.bTokenAddress != address(0), Errors.VL_INVALID_RESERVE_ADDRESS);
    require(reserveData.configuration.getActive(), Errors.VL_NO_ACTIVE_RESERVE);
    require(nftData.configuration.getActive(), Errors.VL_NO_ACTIVE_NFT);
    require(loanData.state == DataTypes.LoanState.Auction, Errors.LPL_INVALID_LOAN_STATE);
    require(loanData.bidderAddress != address(0), Errors.LPL_INVALID_BIDDER_ADDRESS);
  }
  /**
   * @dev Validates an bToken transfer
   * @param from The user from which the bTokens are being transferred
   * @param reserveData The state of the reserve
   */
  function validateTransfer(address from, DataTypes.ReserveData storage reserveData) internal pure {
    from;
    reserveData;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {DataTypes} from "../libraries/types/DataTypes.sol";
import {ReserveLogic} from "../libraries/logic/ReserveLogic.sol";
import {NftLogic} from "../libraries/logic/NftLogic.sol";
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
contract LendPoolStorage {
  using ReserveLogic for DataTypes.ReserveData;
  using NftLogic for DataTypes.NftData;
  ILendPoolAddressesProvider internal _addressesProvider;
  mapping(address => DataTypes.ReserveData) internal _reserves;
  mapping(address => DataTypes.NftData) internal _nfts;
  mapping(uint256 => address) internal _reservesList;
  uint256 internal _reservesCount;
  mapping(uint256 => address) internal _nftsList;
  uint256 internal _nftsCount;
  bool internal _paused;
  uint256 internal _maxNumberOfReserves;
  uint256 internal _maxNumberOfNfts;
  // !!! Never add new variable at here, because this contract is inherited by LendPool !!!
  // !!! Add new variable at LendPool directly !!!
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/************
@title IReserveOracleGetter interface
@notice Interface for getting Reserve price oracle.*/
interface IReserveOracleGetter {
  /* CAUTION: Price uint is ETH based (WEI, 18 decimals) */
  /***********
    @dev returns the asset price in ETH
     */
  function getAssetPrice(address asset) external view returns (uint256);
  // get twap price depending on _period
  function getTwapPrice(address _priceFeedKey, uint256 _interval) external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title IInterestRate interface
 * @dev Interface for the calculation of the interest rates
 * @author Bend
 */
interface IInterestRate {
  function baseVariableBorrowRate() external view returns (uint256);
  function getMaxVariableBorrowRate() external view returns (uint256);
  function calculateInterestRates(
    address reserve,
    uint256 availableLiquidity,
    uint256 totalVariableDebt,
    uint256 reserveFactor
  ) external view returns (uint256, uint256);
  function calculateInterestRates(
    address reserve,
    address bToken,
    uint256 liquidityAdded,
    uint256 liquidityTaken,
    uint256 totalVariableDebt,
    uint256 reserveFactor
  ) external view returns (uint256 liquidityRate, uint256 variableBorrowRate);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {WadRayMath} from "./WadRayMath.sol";
library MathUtils {
  using WadRayMath for uint256;
  /// @dev Ignoring leap years
  uint256 internal constant SECONDS_PER_YEAR = 365 days;
  /**
   * @dev Function to calculate the interest accumulated using a linear interest rate formula
   * @param rate The interest rate, in ray
   * @param lastUpdateTimestamp The timestamp of the last update of the interest
   * @return The interest rate linearly accumulated during the timeDelta, in ray
   **/
  function calculateLinearInterest(uint256 rate, uint40 lastUpdateTimestamp) internal view returns (uint256) {
    //solium-disable-next-line
    uint256 timeDifference = block.timestamp - (uint256(lastUpdateTimestamp));
    return ((rate * (timeDifference)) / SECONDS_PER_YEAR) + (WadRayMath.ray());
  }
  /**
   * @dev Function to calculate the interest using a compounded interest rate formula
   * To avoid expensive exponentiation, the calculation is performed using a binomial approximation:
   *
   *  (1+x)^n = 1+n*x+[n/2*(n-1)]*x^2+[n/6*(n-1)*(n-2)*x^3...
   *
   * The approximation slightly underpays liquidity providers and undercharges borrowers, with the advantage of great gas cost reductions
   * The whitepaper contains reference to the approximation and a table showing the margin of error per different time periods
   *
   * @param rate The interest rate, in ray
   * @param lastUpdateTimestamp The timestamp of the last update of the interest
   * @return The interest rate compounded during the timeDelta, in ray
   **/
  function calculateCompoundedInterest(
    uint256 rate,
    uint40 lastUpdateTimestamp,
    uint256 currentTimestamp
  ) internal pure returns (uint256) {
    //solium-disable-next-line
    uint256 exp = currentTimestamp - (uint256(lastUpdateTimestamp));
    if (exp == 0) {
      return WadRayMath.ray();
    }
    uint256 expMinusOne = exp - 1;
    uint256 expMinusTwo = exp > 2 ? exp - 2 : 0;
    uint256 ratePerSecond = rate / SECONDS_PER_YEAR;
    uint256 basePowerTwo = ratePerSecond.rayMul(ratePerSecond);
    uint256 basePowerThree = basePowerTwo.rayMul(ratePerSecond);
    uint256 secondTerm = (exp * (expMinusOne) * (basePowerTwo)) / 2;
    uint256 thirdTerm = (exp * (expMinusOne) * (expMinusTwo) * (basePowerThree)) / 6;
    return WadRayMath.ray() + (ratePerSecond * (exp)) + (secondTerm) + (thirdTerm);
  }
  /**
   * @dev Calculates the compounded interest between the timestamp of the last update and the current block timestamp
   * @param rate The interest rate (in ray)
   * @param lastUpdateTimestamp The timestamp from which the interest accumulation needs to be calculated
   **/
  function calculateCompoundedInterest(uint256 rate, uint40 lastUpdateTimestamp) internal view returns (uint256) {
    return calculateCompoundedInterest(rate, lastUpdateTimestamp, block.timestamp);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IBToken} from "../interfaces/IBToken.sol";
import {IDebtToken} from "../interfaces/IDebtToken.sol";
import {ILendPoolLoan} from "../interfaces/ILendPoolLoan.sol";
import {ILendPool} from "../interfaces/ILendPool.sol";
import {IReserveOracleGetter} from "../interfaces/IReserveOracleGetter.sol";
import {INFTOracleGetter} from "../interfaces/INFTOracleGetter.sol";
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
import {Errors} from "../libraries/helpers/Errors.sol";
import {WadRayMath} from "../libraries/math/WadRayMath.sol";
import {GenericLogic} from "../libraries/logic/GenericLogic.sol";
import {PercentageMath} from "../libraries/math/PercentageMath.sol";
import {ReserveLogic} from "../libraries/logic/ReserveLogic.sol";
import {NftLogic} from "../libraries/logic/NftLogic.sol";
import {ValidationLogic} from "../libraries/logic/ValidationLogic.sol";
import {ReserveConfiguration} from "../libraries/configuration/ReserveConfiguration.sol";
import {NftConfiguration} from "../libraries/configuration/NftConfiguration.sol";
import {DataTypes} from "../libraries/types/DataTypes.sol";
import {LendPoolStorage} from "./LendPoolStorage.sol";
import {LendPoolStorageExt} from "./LendPoolStorageExt.sol";
import {AddressUpgradeable} from "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
import {IERC721Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
import {IERC721ReceiverUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721ReceiverUpgradeable.sol";
import {Initializable} from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import {ContextUpgradeable} from "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";
/**
 * @title LendPool contract
 * @dev Main point of interaction with an Bend protocol's market
 * - Users can:
 *   # Deposit
 *   # Withdraw
 *   # Borrow
 *   # Repay
 *   # Auction
 *   # Liquidate
 * - To be covered by a proxy contract, owned by the LendPoolAddressesProvider of the specific market
 * - All admin functions are callable by the LendPoolConfigurator contract defined also in the
 *   LendPoolAddressesProvider
 * @author Bend
 **/
// !!! For Upgradable: DO NOT ADJUST Inheritance Order !!!
contract LendPool is
  Initializable,
  ILendPool,
  LendPoolStorage,
  ContextUpgradeable,
  IERC721ReceiverUpgradeable,
  LendPoolStorageExt
{
  using WadRayMath for uint256;
  using PercentageMath for uint256;
  using SafeERC20Upgradeable for IERC20Upgradeable;
  using ReserveLogic for DataTypes.ReserveData;
  using NftLogic for DataTypes.NftData;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  using NftConfiguration for DataTypes.NftConfigurationMap;
  /**
   * @dev Prevents a contract from calling itself, directly or indirectly.
   * Calling a `nonReentrant` function from another `nonReentrant`
   * function is not supported. It is possible to prevent this from happening
   * by making the `nonReentrant` function external, and making it call a
   * `private` function that does the actual work.
   */
  modifier nonReentrant() {
    // On the first call to nonReentrant, _notEntered will be true
    require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
    // Any calls to nonReentrant after this point will fail
    _status = _ENTERED;
    _;
    // By storing the original value once again, a refund is triggered (see
    // https://eips.ethereum.org/EIPS/eip-2200)
    _status = _NOT_ENTERED;
  }
  modifier whenNotPaused() {
    _whenNotPaused();
    _;
  }
  modifier onlyLendPoolConfigurator() {
    _onlyLendPoolConfigurator();
    _;
  }
  function _whenNotPaused() internal view {
    require(!_paused, Errors.LP_IS_PAUSED);
  }
  function _onlyLendPoolConfigurator() internal view {
    require(_addressesProvider.getLendPoolConfigurator() == _msgSender(), Errors.LP_CALLER_NOT_LEND_POOL_CONFIGURATOR);
  }
  /**
   * @dev Function is invoked by the proxy contract when the LendPool contract is added to the
   * LendPoolAddressesProvider of the market.
   * - Caching the address of the LendPoolAddressesProvider in order to reduce gas consumption
   *   on subsequent operations
   * @param provider The address of the LendPoolAddressesProvider
   **/
  function initialize(ILendPoolAddressesProvider provider) public initializer {
    _maxNumberOfReserves = 32;
    _maxNumberOfNfts = 256;
    _addressesProvider = provider;
  }
  /**
   * @dev Deposits an `amount` of underlying asset into the reserve, receiving in return overlying bTokens.
   * - E.g. User deposits 100 USDC and gets in return 100 bUSDC
   * @param asset The address of the underlying asset to deposit
   * @param amount The amount to be deposited
   * @param onBehalfOf The address that will receive the bTokens, same as msg.sender if the user
   *   wants to receive them on his own wallet, or a different address if the beneficiary of bTokens
   *   is a different wallet
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   **/
  function deposit(
    address asset,
    uint256 amount,
    address onBehalfOf,
    uint16 referralCode
  ) external override nonReentrant whenNotPaused {
    require(onBehalfOf != address(0), Errors.VL_INVALID_ONBEHALFOF_ADDRESS);
    DataTypes.ReserveData storage reserve = _reserves[asset];
    address bToken = reserve.bTokenAddress;
    require(bToken != address(0), Errors.VL_INVALID_RESERVE_ADDRESS);
    ValidationLogic.validateDeposit(reserve, amount);
    reserve.updateState();
    reserve.updateInterestRates(asset, bToken, amount, 0);
    IERC20Upgradeable(asset).safeTransferFrom(_msgSender(), bToken, amount);
    IBToken(bToken).mint(onBehalfOf, amount, reserve.liquidityIndex);
    emit Deposit(_msgSender(), asset, amount, onBehalfOf, referralCode);
  }
  /**
   * @dev Withdraws an `amount` of underlying asset from the reserve, burning the equivalent bTokens owned
   * E.g. User has 100 bUSDC, calls withdraw() and receives 100 USDC, burning the 100 bUSDC
   * @param asset The address of the underlying asset to withdraw
   * @param amount The underlying amount to be withdrawn
   *   - Send the value type(uint256).max in order to withdraw the whole bToken balance
   * @param to Address that will receive the underlying, same as msg.sender if the user
   *   wants to receive it on his own wallet, or a different address if the beneficiary is a
   *   different wallet
   * @return The final amount withdrawn
   **/
  function withdraw(
    address asset,
    uint256 amount,
    address to
  ) external override nonReentrant whenNotPaused returns (uint256) {
    require(to != address(0), Errors.VL_INVALID_TARGET_ADDRESS);
    DataTypes.ReserveData storage reserve = _reserves[asset];
    address bToken = reserve.bTokenAddress;
    require(bToken != address(0), Errors.VL_INVALID_RESERVE_ADDRESS);
    uint256 userBalance = IBToken(bToken).balanceOf(_msgSender());
    uint256 amountToWithdraw = amount;
    if (amount == type(uint256).max) {
      amountToWithdraw = userBalance;
    }
    ValidationLogic.validateWithdraw(reserve, amountToWithdraw, userBalance);
    reserve.updateState();
    reserve.updateInterestRates(asset, bToken, 0, amountToWithdraw);
    IBToken(bToken).burn(_msgSender(), to, amountToWithdraw, reserve.liquidityIndex);
    emit Withdraw(_msgSender(), asset, amountToWithdraw, to);
    return amountToWithdraw;
  }
  struct ExecuteBorrowLocalVars {
    address initiator;
    uint256 ltv;
    uint256 liquidationThreshold;
    uint256 liquidationBonus;
    uint256 loanId;
    address reserveOracle;
    address nftOracle;
    address loanAddress;
  }
  /**
   * @dev Allows users to borrow a specific `amount` of the reserve underlying asset
   * - E.g. User borrows 100 USDC, receiving the 100 USDC in his wallet
   *   and lock collateral asset in contract
   * @param asset The address of the underlying asset to borrow
   * @param amount The amount to be borrowed
   * @param nftAsset The address of the underlying nft used as collateral
   * @param nftTokenId The token ID of the underlying nft used as collateral
   * @param onBehalfOf Address of the user who will receive the loan. Should be the address of the borrower itself
   * calling the function if he wants to borrow against his own collateral
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   **/
  function borrow(
    address asset,
    uint256 amount,
    address nftAsset,
    uint256 nftTokenId,
    address onBehalfOf,
    uint16 referralCode
  ) external override nonReentrant whenNotPaused {
    _borrow(asset, amount, nftAsset, nftTokenId, onBehalfOf, referralCode);
  }
  function batchBorrow(
    address[] calldata assets,
    uint256[] calldata amounts,
    address[] calldata nftAssets,
    uint256[] calldata nftTokenIds,
    address onBehalfOf,
    uint16 referralCode
  ) external override nonReentrant whenNotPaused {
    require(nftAssets.length == assets.length, "inconsistent assets length");
    require(nftAssets.length == amounts.length, "inconsistent amounts length");
    require(nftAssets.length == nftTokenIds.length, "inconsistent tokenIds length");
    for (uint256 i = 0; i < nftAssets.length; i++) {
      _borrow(assets[i], amounts[i], nftAssets[i], nftTokenIds[i], onBehalfOf, referralCode);
    }
  }
  function _borrow(
    address asset,
    uint256 amount,
    address nftAsset,
    uint256 nftTokenId,
    address onBehalfOf,
    uint16 referralCode
  ) internal {
    require(onBehalfOf != address(0), Errors.VL_INVALID_ONBEHALFOF_ADDRESS);
    ExecuteBorrowLocalVars memory vars;
    vars.initiator = _msgSender();
    DataTypes.ReserveData storage reserveData = _reserves[asset];
    DataTypes.NftData storage nftData = _nfts[nftAsset];
    // update state MUST BEFORE get borrow amount which is depent on latest borrow index
    reserveData.updateState();
    // Convert asset amount to ETH
    vars.reserveOracle = _addressesProvider.getReserveOracle();
    vars.nftOracle = _addressesProvider.getNFTOracle();
    vars.loanAddress = _addressesProvider.getLendPoolLoan();
    vars.loanId = ILendPoolLoan(vars.loanAddress).getCollateralLoanId(nftAsset, nftTokenId);
    ValidationLogic.validateBorrow(
      onBehalfOf,
      asset,
      amount,
      reserveData,
      nftAsset,
      nftData,
      vars.loanAddress,
      vars.loanId,
      vars.reserveOracle,
      vars.nftOracle
    );
    if (vars.loanId == 0) {
      IERC721Upgradeable(nftAsset).safeTransferFrom(_msgSender(), address(this), nftTokenId);
      vars.loanId = ILendPoolLoan(vars.loanAddress).createLoan(
        vars.initiator,
        onBehalfOf,
        nftAsset,
        nftTokenId,
        nftData.bNftAddress,
        asset,
        amount,
        reserveData.variableBorrowIndex
      );
    } else {
      ILendPoolLoan(vars.loanAddress).updateLoan(
        vars.initiator,
        vars.loanId,
        amount,
        0,
        reserveData.variableBorrowIndex
      );
    }
    IDebtToken(reserveData.debtTokenAddress).mint(vars.initiator, onBehalfOf, amount, reserveData.variableBorrowIndex);
    // update interest rate according latest borrow amount (utilizaton)
    reserveData.updateInterestRates(asset, reserveData.bTokenAddress, 0, amount);
    IBToken(reserveData.bTokenAddress).transferUnderlyingTo(vars.initiator, amount);
    emit Borrow(
      vars.initiator,
      asset,
      amount,
      nftAsset,
      nftTokenId,
      onBehalfOf,
      reserveData.currentVariableBorrowRate,
      vars.loanId,
      referralCode
    );
  }
  struct RepayLocalVars {
    address initiator;
    address poolLoan;
    address onBehalfOf;
    uint256 loanId;
    bool isUpdate;
    uint256 borrowAmount;
    uint256 repayAmount;
  }
  /**
   * @notice Repays a borrowed `amount` on a specific reserve, burning the equivalent loan owned
   * - E.g. User repays 100 USDC, burning loan and receives collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param amount The amount to repay
   **/
  function repay(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount
  ) external override nonReentrant whenNotPaused returns (uint256, bool) {
    return _repay(nftAsset, nftTokenId, amount);
  }
  function batchRepay(
    address[] calldata nftAssets,
    uint256[] calldata nftTokenIds,
    uint256[] calldata amounts
  ) external override nonReentrant whenNotPaused returns (uint256[] memory, bool[] memory) {
    require(nftAssets.length == amounts.length, "inconsistent amounts length");
    require(nftAssets.length == nftTokenIds.length, "inconsistent tokenIds length");
    uint256[] memory repayAmounts = new uint256[](nftAssets.length);
    bool[] memory repayAlls = new bool[](nftAssets.length);
    for (uint256 i = 0; i < nftAssets.length; i++) {
      (repayAmounts[i], repayAlls[i]) = _repay(nftAssets[i], nftTokenIds[i], amounts[i]);
    }
    return (repayAmounts, repayAlls);
  }
  function _repay(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount
  ) internal returns (uint256, bool) {
    RepayLocalVars memory vars;
    vars.initiator = _msgSender();
    vars.poolLoan = _addressesProvider.getLendPoolLoan();
    vars.loanId = ILendPoolLoan(vars.poolLoan).getCollateralLoanId(nftAsset, nftTokenId);
    require(vars.loanId != 0, Errors.LP_NFT_IS_NOT_USED_AS_COLLATERAL);
    DataTypes.LoanData memory loanData = ILendPoolLoan(vars.poolLoan).getLoan(vars.loanId);
    DataTypes.ReserveData storage reserveData = _reserves[loanData.reserveAsset];
    DataTypes.NftData storage nftData = _nfts[loanData.nftAsset];
    // update state MUST BEFORE get borrow amount which is depent on latest borrow index
    reserveData.updateState();
    (, vars.borrowAmount) = ILendPoolLoan(vars.poolLoan).getLoanReserveBorrowAmount(vars.loanId);
    ValidationLogic.validateRepay(reserveData, nftData, loanData, amount, vars.borrowAmount);
    vars.repayAmount = vars.borrowAmount;
    vars.isUpdate = false;
    if (amount < vars.repayAmount) {
      vars.isUpdate = true;
      vars.repayAmount = amount;
    }
    if (vars.isUpdate) {
      ILendPoolLoan(vars.poolLoan).updateLoan(
        vars.initiator,
        vars.loanId,
        0,
        vars.repayAmount,
        reserveData.variableBorrowIndex
      );
    } else {
      ILendPoolLoan(vars.poolLoan).repayLoan(
        vars.initiator,
        vars.loanId,
        nftData.bNftAddress,
        vars.repayAmount,
        reserveData.variableBorrowIndex
      );
    }
    IDebtToken(reserveData.debtTokenAddress).burn(loanData.borrower, vars.repayAmount, reserveData.variableBorrowIndex);
    // update interest rate according latest borrow amount (utilizaton)
    reserveData.updateInterestRates(loanData.reserveAsset, reserveData.bTokenAddress, vars.repayAmount, 0);
    // transfer repay amount to bToken
    IERC20Upgradeable(loanData.reserveAsset).safeTransferFrom(
      vars.initiator,
      reserveData.bTokenAddress,
      vars.repayAmount
    );
    // transfer erc721 to borrower
    if (!vars.isUpdate) {
      IERC721Upgradeable(loanData.nftAsset).safeTransferFrom(address(this), loanData.borrower, nftTokenId);
    }
    emit Repay(
      vars.initiator,
      loanData.reserveAsset,
      vars.repayAmount,
      loanData.nftAsset,
      loanData.nftTokenId,
      loanData.borrower,
      vars.loanId
    );
    return (vars.repayAmount, !vars.isUpdate);
  }
  /**
   * @dev Function to auction a non-healthy position collateral-wise
   * - The bidder want to buy collateral asset of the user getting liquidated
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param bidPrice The bid price of the bidder want to buy underlying NFT
   * @param onBehalfOf Address of the user who will get the underlying NFT, same as msg.sender if the user
   *   wants to receive them on his own wallet, or a different address if the beneficiary of NFT
   *   is a different wallet
   **/
  function auction(
    address nftAsset,
    uint256 nftTokenId,
    uint256 bidPrice,
    address onBehalfOf
  ) external override nonReentrant whenNotPaused {
    address poolLiquidator = _addressesProvider.getLendPoolLiquidator();
    //solium-disable-next-line
    (bool success, bytes memory result) = poolLiquidator.delegatecall(
      abi.encodeWithSignature("auction(address,uint256,uint256,address)", nftAsset, nftTokenId, bidPrice, onBehalfOf)
    );
    _verifyCallResult(success, result, Errors.LP_DELEGATE_CALL_FAILED);
  }
  /**
   * @notice Redeem a NFT loan which state is in Auction
   * - E.g. User repays 100 USDC, burning loan and receives collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param amount The amount to repay the debt
   * @param bidFine The amount of bid fine
   **/
  function redeem(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount,
    uint256 bidFine
  ) external override nonReentrant whenNotPaused returns (uint256) {
    address poolLiquidator = _addressesProvider.getLendPoolLiquidator();
    //solium-disable-next-line
    (bool success, bytes memory result) = poolLiquidator.delegatecall(
      abi.encodeWithSignature("redeem(address,uint256,uint256,uint256)", nftAsset, nftTokenId, amount, bidFine)
    );
    bytes memory resultData = _verifyCallResult(success, result, Errors.LP_DELEGATE_CALL_FAILED);
    uint256 repayAmount = abi.decode(resultData, (uint256));
    return (repayAmount);
  }
  /**
   * @dev Function to liquidate a non-healthy position collateral-wise
   * - The caller (liquidator) buy collateral asset of the user getting liquidated, and receives
   *   the collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   **/
  function liquidate(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount
  ) external override nonReentrant whenNotPaused returns (uint256) {
    address poolLiquidator = _addressesProvider.getLendPoolLiquidator();
    //solium-disable-next-line
    (bool success, bytes memory result) = poolLiquidator.delegatecall(
      abi.encodeWithSignature("liquidate(address,uint256,uint256)", nftAsset, nftTokenId, amount)
    );
    bytes memory resultData = _verifyCallResult(success, result, Errors.LP_DELEGATE_CALL_FAILED);
    uint256 extraAmount = abi.decode(resultData, (uint256));
    return (extraAmount);
  }
  function onERC721Received(
    address operator,
    address from,
    uint256 tokenId,
    bytes calldata data
  ) external pure override returns (bytes4) {
    operator;
    from;
    tokenId;
    data;
    return IERC721ReceiverUpgradeable.onERC721Received.selector;
  }
  /**
   * @dev Returns the configuration of the reserve
   * @param asset The address of the underlying asset of the reserve
   * @return The configuration of the reserve
   **/
  function getReserveConfiguration(address asset)
    external
    view
    override
    returns (DataTypes.ReserveConfigurationMap memory)
  {
    return _reserves[asset].configuration;
  }
  /**
   * @dev Returns the configuration of the NFT
   * @param asset The address of the asset of the NFT
   * @return The configuration of the NFT
   **/
  function getNftConfiguration(address asset) external view override returns (DataTypes.NftConfigurationMap memory) {
    return _nfts[asset].configuration;
  }
  /**
   * @dev Returns the normalized income normalized income of the reserve
   * @param asset The address of the underlying asset of the reserve
   * @return The reserve's normalized income
   */
  function getReserveNormalizedIncome(address asset) external view override returns (uint256) {
    return _reserves[asset].getNormalizedIncome();
  }
  /**
   * @dev Returns the normalized variable debt per unit of asset
   * @param asset The address of the underlying asset of the reserve
   * @return The reserve normalized variable debt
   */
  function getReserveNormalizedVariableDebt(address asset) external view override returns (uint256) {
    return _reserves[asset].getNormalizedDebt();
  }
  /**
   * @dev Returns the state and configuration of the reserve
   * @param asset The address of the underlying asset of the reserve
   * @return The state of the reserve
   **/
  function getReserveData(address asset) external view override returns (DataTypes.ReserveData memory) {
    return _reserves[asset];
  }
  /**
   * @dev Returns the state and configuration of the nft
   * @param asset The address of the underlying asset of the nft
   * @return The state of the nft
   **/
  function getNftData(address asset) external view override returns (DataTypes.NftData memory) {
    return _nfts[asset];
  }
  /**
   * @dev Returns the loan data of the NFT
   * @param nftAsset The address of the NFT
   * @param reserveAsset The address of the Reserve
   * @return totalCollateralInETH the total collateral in ETH of the NFT
   * @return totalCollateralInReserve the total collateral in Reserve of the NFT
   * @return availableBorrowsInETH the borrowing power in ETH of the NFT
   * @return availableBorrowsInReserve the borrowing power in Reserve of the NFT
   * @return ltv the loan to value of the user
   * @return liquidationThreshold the liquidation threshold of the NFT
   * @return liquidationBonus the liquidation bonus of the NFT
   **/
  function getNftCollateralData(address nftAsset, address reserveAsset)
    external
    view
    override
    returns (
      uint256 totalCollateralInETH,
      uint256 totalCollateralInReserve,
      uint256 availableBorrowsInETH,
      uint256 availableBorrowsInReserve,
      uint256 ltv,
      uint256 liquidationThreshold,
      uint256 liquidationBonus
    )
  {
    DataTypes.NftData storage nftData = _nfts[nftAsset];
    DataTypes.ReserveData storage reserveData = _reserves[reserveAsset];
    (ltv, liquidationThreshold, liquidationBonus) = nftData.configuration.getCollateralParams();
    (totalCollateralInETH, totalCollateralInReserve) = GenericLogic.calculateNftCollateralData(
      reserveAsset,
      reserveData,
      nftAsset,
      nftData,
      _addressesProvider.getReserveOracle(),
      _addressesProvider.getNFTOracle()
    );
    availableBorrowsInETH = GenericLogic.calculateAvailableBorrows(totalCollateralInETH, 0, ltv);
    availableBorrowsInReserve = GenericLogic.calculateAvailableBorrows(totalCollateralInReserve, 0, ltv);
  }
  /**
   * @dev Returns the debt data of the NFT
   * @param nftAsset The address of the NFT
   * @param nftTokenId The token id of the NFT
   * @return loanId the loan id of the NFT
   * @return reserveAsset the address of the Reserve
   * @return totalCollateral the total power of the NFT
   * @return totalDebt the total debt of the NFT
   * @return availableBorrows the borrowing power left of the NFT
   * @return healthFactor the current health factor of the NFT
   **/
  function getNftDebtData(address nftAsset, uint256 nftTokenId)
    external
    view
    override
    returns (
      uint256 loanId,
      address reserveAsset,
      uint256 totalCollateral,
      uint256 totalDebt,
      uint256 availableBorrows,
      uint256 healthFactor
    )
  {
    DataTypes.NftData storage nftData = _nfts[nftAsset];
    (uint256 ltv, uint256 liquidationThreshold, ) = nftData.configuration.getCollateralParams();
    loanId = ILendPoolLoan(_addressesProvider.getLendPoolLoan()).getCollateralLoanId(nftAsset, nftTokenId);
    if (loanId == 0) {
      return (0, address(0), 0, 0, 0, 0);
    }
    DataTypes.LoanData memory loan = ILendPoolLoan(_addressesProvider.getLendPoolLoan()).getLoan(loanId);
    reserveAsset = loan.reserveAsset;
    DataTypes.ReserveData storage reserveData = _reserves[reserveAsset];
    (, totalCollateral) = GenericLogic.calculateNftCollateralData(
      reserveAsset,
      reserveData,
      nftAsset,
      nftData,
      _addressesProvider.getReserveOracle(),
      _addressesProvider.getNFTOracle()
    );
    (, totalDebt) = GenericLogic.calculateNftDebtData(
      reserveAsset,
      reserveData,
      _addressesProvider.getLendPoolLoan(),
      loanId,
      _addressesProvider.getReserveOracle()
    );
    availableBorrows = GenericLogic.calculateAvailableBorrows(totalCollateral, totalDebt, ltv);
    if (loan.state == DataTypes.LoanState.Active) {
      healthFactor = GenericLogic.calculateHealthFactorFromBalances(totalCollateral, totalDebt, liquidationThreshold);
    }
  }
  /**
   * @dev Returns the auction data of the NFT
   * @param nftAsset The address of the NFT
   * @param nftTokenId The token id of the NFT
   * @return loanId the loan id of the NFT
   * @return bidderAddress the highest bidder address of the loan
   * @return bidPrice the highest bid price in Reserve of the loan
   * @return bidBorrowAmount the borrow amount in Reserve of the loan
   * @return bidFine the penalty fine of the loan
   **/
  function getNftAuctionData(address nftAsset, uint256 nftTokenId)
    external
    view
    override
    returns (
      uint256 loanId,
      address bidderAddress,
      uint256 bidPrice,
      uint256 bidBorrowAmount,
      uint256 bidFine
    )
  {
    DataTypes.NftData storage nftData = _nfts[nftAsset];
    ILendPoolLoan poolLoan = ILendPoolLoan(_addressesProvider.getLendPoolLoan());
    loanId = poolLoan.getCollateralLoanId(nftAsset, nftTokenId);
    if (loanId != 0) {
      DataTypes.LoanData memory loan = poolLoan.getLoan(loanId);
      if (loan.bidPrice > 0) {
        bidderAddress = loan.bidderAddress;
        bidPrice = loan.bidPrice;
        bidBorrowAmount = loan.bidBorrowAmount;
        uint256 borrowAmount = loan.bidBorrowAmount;
        if (loan.state == DataTypes.LoanState.Active) {
          (, borrowAmount) = poolLoan.getLoanReserveBorrowAmount(loanId);
        }
        bidFine = borrowAmount.percentMul(nftData.configuration.getRedeemFine());
      }
    }
  }
  struct GetLiquidationPriceLocalVars {
    address poolLoan;
    uint256 loanId;
    uint256 thresholdPrice;
    uint256 liquidatePrice;
    uint256 paybackAmount;
    uint256 remainAmount;
  }
  function getNftLiquidatePrice(address nftAsset, uint256 nftTokenId)
    external
    view
    override
    returns (uint256 liquidatePrice, uint256 paybackAmount)
  {
    GetLiquidationPriceLocalVars memory vars;
    vars.poolLoan = _addressesProvider.getLendPoolLoan();
    vars.loanId = ILendPoolLoan(vars.poolLoan).getCollateralLoanId(nftAsset, nftTokenId);
    if (vars.loanId == 0) {
      return (0, 0);
    }
    DataTypes.LoanData memory loanData = ILendPoolLoan(vars.poolLoan).getLoan(vars.loanId);
    DataTypes.ReserveData storage reserveData = _reserves[loanData.reserveAsset];
    DataTypes.NftData storage nftData = _nfts[nftAsset];
    (vars.paybackAmount, vars.thresholdPrice, vars.liquidatePrice) = GenericLogic.calculateLoanLiquidatePrice(
      vars.loanId,
      loanData.reserveAsset,
      reserveData,
      loanData.nftAsset,
      nftData,
      vars.poolLoan,
      _addressesProvider.getReserveOracle(),
      _addressesProvider.getNFTOracle()
    );
    if (vars.liquidatePrice < vars.paybackAmount) {
      vars.liquidatePrice = vars.paybackAmount;
    }
    return (vars.liquidatePrice, vars.paybackAmount);
  }
  /**
   * @dev Validates and finalizes an bToken transfer
   * - Only callable by the overlying bToken of the `asset`
   * @param asset The address of the underlying asset of the bToken
   * @param from The user from which the bToken are transferred
   * @param to The user receiving the bTokens
   * @param amount The amount being transferred/withdrawn
   * @param balanceFromBefore The bToken balance of the `from` user before the transfer
   * @param balanceToBefore The bToken balance of the `to` user before the transfer
   */
  function finalizeTransfer(
    address asset,
    address from,
    address to,
    uint256 amount,
    uint256 balanceFromBefore,
    uint256 balanceToBefore
  ) external view override whenNotPaused {
    asset;
    from;
    to;
    amount;
    balanceFromBefore;
    balanceToBefore;
    DataTypes.ReserveData storage reserve = _reserves[asset];
    require(_msgSender() == reserve.bTokenAddress, Errors.LP_CALLER_MUST_BE_AN_BTOKEN);
    ValidationLogic.validateTransfer(from, reserve);
  }
  /**
   * @dev Returns the list of the initialized reserves
   **/
  function getReservesList() external view override returns (address[] memory) {
    address[] memory _activeReserves = new address[](_reservesCount);
    for (uint256 i = 0; i < _reservesCount; i++) {
      _activeReserves[i] = _reservesList[i];
    }
    return _activeReserves;
  }
  /**
   * @dev Returns the list of the initialized nfts
   **/
  function getNftsList() external view override returns (address[] memory) {
    address[] memory _activeNfts = new address[](_nftsCount);
    for (uint256 i = 0; i < _nftsCount; i++) {
      _activeNfts[i] = _nftsList[i];
    }
    return _activeNfts;
  }
  /**
   * @dev Set the _pause state of the pool
   * - Only callable by the LendPoolConfigurator contract
   * @param val `true` to pause the pool, `false` to un-pause it
   */
  function setPause(bool val) external override onlyLendPoolConfigurator {
    _paused = val;
    if (_paused) {
      emit Paused();
    } else {
      emit Unpaused();
    }
  }
  /**
   * @dev Returns if the LendPool is paused
   */
  function paused() external view override returns (bool) {
    return _paused;
  }
  /**
   * @dev Returns the cached LendPoolAddressesProvider connected to this contract
   **/
  function getAddressesProvider() external view override returns (ILendPoolAddressesProvider) {
    return _addressesProvider;
  }
  function setMaxNumberOfReserves(uint256 val) external override onlyLendPoolConfigurator {
    _maxNumberOfReserves = val;
  }
  /**
   * @dev Returns the maximum number of reserves supported to be listed in this LendPool
   */
  function getMaxNumberOfReserves() public view override returns (uint256) {
    return _maxNumberOfReserves;
  }
  function setMaxNumberOfNfts(uint256 val) external override onlyLendPoolConfigurator {
    _maxNumberOfNfts = val;
  }
  /**
   * @dev Returns the maximum number of nfts supported to be listed in this LendPool
   */
  function getMaxNumberOfNfts() public view override returns (uint256) {
    return _maxNumberOfNfts;
  }
  /**
   * @dev Initializes a reserve, activating it, assigning an bToken and nft loan and an
   * interest rate strategy
   * - Only callable by the LendPoolConfigurator contract
   * @param asset The address of the underlying asset of the reserve
   * @param bTokenAddress The address of the bToken that will be assigned to the reserve
   * @param debtTokenAddress The address of the debtToken that will be assigned to the reserve
   * @param interestRateAddress The address of the interest rate strategy contract
   **/
  function initReserve(
    address asset,
    address bTokenAddress,
    address debtTokenAddress,
    address interestRateAddress
  ) external override onlyLendPoolConfigurator {
    require(AddressUpgradeable.isContract(asset), Errors.LP_NOT_CONTRACT);
    _reserves[asset].init(bTokenAddress, debtTokenAddress, interestRateAddress);
    _addReserveToList(asset);
  }
  /**
   * @dev Initializes a nft, activating it, assigning nft loan and an
   * interest rate strategy
   * - Only callable by the LendPoolConfigurator contract
   * @param asset The address of the underlying asset of the nft
   **/
  function initNft(address asset, address bNftAddress) external override onlyLendPoolConfigurator {
    require(AddressUpgradeable.isContract(asset), Errors.LP_NOT_CONTRACT);
    _nfts[asset].init(bNftAddress);
    _addNftToList(asset);
    require(_addressesProvider.getLendPoolLoan() != address(0), Errors.LPC_INVALIED_LOAN_ADDRESS);
    IERC721Upgradeable(asset).setApprovalForAll(_addressesProvider.getLendPoolLoan(), true);
    ILendPoolLoan(_addressesProvider.getLendPoolLoan()).initNft(asset, bNftAddress);
  }
  /**
   * @dev Updates the address of the interest rate strategy contract
   * - Only callable by the LendPoolConfigurator contract
   * @param asset The address of the underlying asset of the reserve
   * @param rateAddress The address of the interest rate strategy contract
   **/
  function setReserveInterestRateAddress(address asset, address rateAddress)
    external
    override
    onlyLendPoolConfigurator
  {
    _reserves[asset].interestRateAddress = rateAddress;
  }
  /**
   * @dev Sets the configuration bitmap of the reserve as a whole
   * - Only callable by the LendPoolConfigurator contract
   * @param asset The address of the underlying asset of the reserve
   * @param configuration The new configuration bitmap
   **/
  function setReserveConfiguration(address asset, uint256 configuration) external override onlyLendPoolConfigurator {
    _reserves[asset].configuration.data = configuration;
  }
  /**
   * @dev Sets the configuration bitmap of the NFT as a whole
   * - Only callable by the LendPoolConfigurator contract
   * @param asset The address of the asset of the NFT
   * @param configuration The new configuration bitmap
   **/
  function setNftConfiguration(address asset, uint256 configuration) external override onlyLendPoolConfigurator {
    _nfts[asset].configuration.data = configuration;
  }
  function _addReserveToList(address asset) internal {
    uint256 reservesCount = _reservesCount;
    require(reservesCount < _maxNumberOfReserves, Errors.LP_NO_MORE_RESERVES_ALLOWED);
    bool reserveAlreadyAdded = _reserves[asset].id != 0 || _reservesList[0] == asset;
    if (!reserveAlreadyAdded) {
      _reserves[asset].id = uint8(reservesCount);
      _reservesList[reservesCount] = asset;
      _reservesCount = reservesCount + 1;
    }
  }
  function _addNftToList(address asset) internal {
    uint256 nftsCount = _nftsCount;
    require(nftsCount < _maxNumberOfNfts, Errors.LP_NO_MORE_NFTS_ALLOWED);
    bool nftAlreadyAdded = _nfts[asset].id != 0 || _nftsList[0] == asset;
    if (!nftAlreadyAdded) {
      _nfts[asset].id = uint8(nftsCount);
      _nftsList[nftsCount] = asset;
      _nftsCount = nftsCount + 1;
    }
  }
  function _verifyCallResult(
    bool success,
    bytes memory returndata,
    string memory errorMessage
  ) internal pure returns (bytes memory) {
    if (success) {
      return returndata;
    } else {
      // Look for revert reason and bubble it up if present
      if (returndata.length > 0) {
        // The easiest way to bubble the revert reason is using memory via assembly
        assembly {
          let returndata_size := mload(returndata)
          revert(add(32, returndata), returndata_size)
        }
      } else {
        revert(errorMessage);
      }
    }
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
contract LendPoolStorageExt {
  // !!! Add new variable MUST append it only, do not insert, update type & name, or change order !!!
  // https://docs.openzeppelin.com/upgrades-plugins/1.x/writing-upgradeable#potentially-unsafe-operations
  uint256 internal constant _NOT_ENTERED = 0;
  uint256 internal constant _ENTERED = 1;
  uint256 internal _status;
  // For upgradable, add one new variable above, minus 1 at here
  uint256[49] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/ERC721.sol)
pragma solidity ^0.8.0;
import "./IERC721Upgradeable.sol";
import "./IERC721ReceiverUpgradeable.sol";
import "./extensions/IERC721MetadataUpgradeable.sol";
import "../../utils/AddressUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import "../../utils/StringsUpgradeable.sol";
import "../../utils/introspection/ERC165Upgradeable.sol";
import "../../proxy/utils/Initializable.sol";
/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721Upgradeable is Initializable, ContextUpgradeable, ERC165Upgradeable, IERC721Upgradeable, IERC721MetadataUpgradeable {
    using AddressUpgradeable for address;
    using StringsUpgradeable for uint256;
    // Token name
    string private _name;
    // Token symbol
    string private _symbol;
    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;
    // Mapping owner address to token count
    mapping(address => uint256) private _balances;
    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;
    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;
    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    function __ERC721_init(string memory name_, string memory symbol_) internal onlyInitializing {
        __Context_init_unchained();
        __ERC165_init_unchained();
        __ERC721_init_unchained(name_, symbol_);
    }
    function __ERC721_init_unchained(string memory name_, string memory symbol_) internal onlyInitializing {
        _name = name_;
        _symbol = symbol_;
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165Upgradeable, IERC165Upgradeable) returns (bool) {
        return
            interfaceId == type(IERC721Upgradeable).interfaceId ||
            interfaceId == type(IERC721MetadataUpgradeable).interfaceId ||
            super.supportsInterface(interfaceId);
    }
    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _balances[owner];
    }
    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");
        return owner;
    }
    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }
    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }
    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }
    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overriden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }
    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721Upgradeable.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");
        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );
        _approve(to, tokenId);
    }
    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");
        return _tokenApprovals[tokenId];
    }
    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }
    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }
    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _transfer(from, to, tokenId);
    }
    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }
    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }
    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }
    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721Upgradeable.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }
    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }
    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }
    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");
        _beforeTokenTransfer(address(0), to, tokenId);
        _balances[to] += 1;
        _owners[tokenId] = to;
        emit Transfer(address(0), to, tokenId);
    }
    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721Upgradeable.ownerOf(tokenId);
        _beforeTokenTransfer(owner, address(0), tokenId);
        // Clear approvals
        _approve(address(0), tokenId);
        _balances[owner] -= 1;
        delete _owners[tokenId];
        emit Transfer(owner, address(0), tokenId);
    }
    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721Upgradeable.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");
        _beforeTokenTransfer(from, to, tokenId);
        // Clear approvals from the previous owner
        _approve(address(0), tokenId);
        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;
        emit Transfer(from, to, tokenId);
    }
    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721Upgradeable.ownerOf(tokenId), to, tokenId);
    }
    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits a {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }
    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721ReceiverUpgradeable(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721ReceiverUpgradeable.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }
    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
    uint256[44] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)
pragma solidity ^0.8.0;
/**
 * @dev String operations.
 */
library StringsUpgradeable {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }
    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }
    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)
pragma solidity ^0.8.0;
import "./IERC165Upgradeable.sol";
import "../../proxy/utils/Initializable.sol";
/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165Upgradeable is Initializable, IERC165Upgradeable {
    function __ERC165_init() internal onlyInitializing {
        __ERC165_init_unchained();
    }
    function __ERC165_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165Upgradeable).interfaceId;
    }
    uint256[50] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Enumerable.sol)
pragma solidity ^0.8.0;
import "../ERC721Upgradeable.sol";
import "./IERC721EnumerableUpgradeable.sol";
import "../../../proxy/utils/Initializable.sol";
/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721EnumerableUpgradeable is Initializable, ERC721Upgradeable, IERC721EnumerableUpgradeable {
    function __ERC721Enumerable_init() internal onlyInitializing {
        __Context_init_unchained();
        __ERC165_init_unchained();
        __ERC721Enumerable_init_unchained();
    }
    function __ERC721Enumerable_init_unchained() internal onlyInitializing {
    }
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;
    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;
    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;
    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165Upgradeable, ERC721Upgradeable) returns (bool) {
        return interfaceId == type(IERC721EnumerableUpgradeable).interfaceId || super.supportsInterface(interfaceId);
    }
    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Upgradeable.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }
    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _allTokens.length;
    }
    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721EnumerableUpgradeable.totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }
    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);
        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }
    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721Upgradeable.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }
    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }
    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).
        uint256 lastTokenIndex = ERC721Upgradeable.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];
        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];
            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }
        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }
    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).
        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];
        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];
        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
    uint256[46] private __gap;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IBNFTRegistry} from "../../interfaces/IBNFTRegistry.sol";
import {IBNFT} from "../../interfaces/IBNFT.sol";
import {AddressUpgradeable} from "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol";
import {Initializable} from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import {IERC721MetadataUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/extensions/IERC721MetadataUpgradeable.sol";
import {TransparentUpgradeableProxy} from "@openzeppelin/contracts/proxy/transparent/TransparentUpgradeableProxy.sol";
contract BNFTRegistry is IBNFTRegistry, Initializable, OwnableUpgradeable {
  mapping(address => address) public bNftProxys;
  mapping(address => address) public bNftImpls;
  address[] public bNftAssetLists;
  string public namePrefix;
  string public symbolPrefix;
  address public bNftGenericImpl;
  mapping(address => string) public customSymbols;
  function getBNFTAddresses(address nftAsset) external view override returns (address bNftProxy, address bNftImpl) {
    bNftProxy = bNftProxys[nftAsset];
    bNftImpl = bNftImpls[nftAsset];
  }
  function getBNFTAddressesByIndex(uint16 index) external view override returns (address bNftProxy, address bNftImpl) {
    require(index < bNftAssetLists.length, "BNFTR: invalid index");
    bNftProxy = bNftProxys[bNftAssetLists[index]];
    bNftImpl = bNftImpls[bNftAssetLists[index]];
  }
  function getBNFTAssetList() external view override returns (address[] memory) {
    return bNftAssetLists;
  }
  function allBNFTAssetLength() external view override returns (uint256) {
    return bNftAssetLists.length;
  }
  function initialize(
    address genericImpl,
    string memory namePrefix_,
    string memory symbolPrefix_
  ) external override initializer {
    require(genericImpl != address(0), "BNFTR: impl is zero address");
    __Ownable_init();
    bNftGenericImpl = genericImpl;
    namePrefix = namePrefix_;
    symbolPrefix = symbolPrefix_;
    emit Initialized(genericImpl, namePrefix, symbolPrefix);
  }
  /**
   * @dev See {IBNFTRegistry-createBNFT}.
   */
  function createBNFT(address nftAsset) external override returns (address bNftProxy) {
    _requireAddressIsERC721(nftAsset);
    require(bNftProxys[nftAsset] == address(0), "BNFTR: asset exist");
    require(bNftGenericImpl != address(0), "BNFTR: impl is zero address");
    bNftProxy = _createProxyAndInitWithImpl(nftAsset, bNftGenericImpl);
    emit BNFTCreated(nftAsset, bNftImpls[nftAsset], bNftProxy, bNftAssetLists.length);
  }
  /**
   * @dev See {IBNFTRegistry-setBNFTGenericImpl}.
   */
  function setBNFTGenericImpl(address genericImpl) external override onlyOwner {
    require(genericImpl != address(0), "BNFTR: impl is zero address");
    bNftGenericImpl = genericImpl;
    emit GenericImplementationUpdated(genericImpl);
  }
  /**
   * @dev See {IBNFTRegistry-createBNFTWithImpl}.
   */
  function createBNFTWithImpl(address nftAsset, address bNftImpl)
    external
    override
    onlyOwner
    returns (address bNftProxy)
  {
    _requireAddressIsERC721(nftAsset);
    require(bNftImpl != address(0), "BNFTR: implement is zero address");
    require(bNftProxys[nftAsset] == address(0), "BNFTR: asset exist");
    bNftProxy = _createProxyAndInitWithImpl(nftAsset, bNftImpl);
    emit BNFTCreated(nftAsset, bNftImpls[nftAsset], bNftProxy, bNftAssetLists.length);
  }
  /**
   * @dev See {IBNFTRegistry-upgradeBNFTWithImpl}.
   */
  function upgradeBNFTWithImpl(
    address nftAsset,
    address bNftImpl,
    bytes memory encodedCallData
  ) external override onlyOwner {
    address bNftProxy = bNftProxys[nftAsset];
    require(bNftProxy != address(0), "BNFTR: asset nonexist");
    TransparentUpgradeableProxy proxy = TransparentUpgradeableProxy(payable(bNftProxy));
    if (encodedCallData.length > 0) {
      proxy.upgradeToAndCall(bNftImpl, encodedCallData);
    } else {
      proxy.upgradeTo(bNftImpl);
    }
    bNftImpls[nftAsset] = bNftImpl;
    emit BNFTUpgraded(nftAsset, bNftImpl, bNftProxy, bNftAssetLists.length);
  }
  /**
   * @dev See {IBNFTRegistry-addCustomeSymbols}.
   */
  function addCustomeSymbols(address[] memory nftAssets_, string[] memory symbols_) external override onlyOwner {
    require(nftAssets_.length == symbols_.length, "BNFTR: inconsistent parameters");
    for (uint256 i = 0; i < nftAssets_.length; i++) {
      customSymbols[nftAssets_[i]] = symbols_[i];
    }
  }
  function _createProxyAndInitWithImpl(address nftAsset, address bNftImpl) internal returns (address bNftProxy) {
    bytes memory initParams = _buildInitParams(nftAsset);
    TransparentUpgradeableProxy proxy = new TransparentUpgradeableProxy(bNftImpl, address(this), initParams);
    bNftProxy = address(proxy);
    bNftImpls[nftAsset] = bNftImpl;
    bNftProxys[nftAsset] = bNftProxy;
    bNftAssetLists.push(nftAsset);
  }
  function _buildInitParams(address nftAsset) internal view returns (bytes memory initParams) {
    string memory nftSymbol = customSymbols[nftAsset];
    if (bytes(nftSymbol).length == 0) {
      nftSymbol = IERC721MetadataUpgradeable(nftAsset).symbol();
    }
    string memory bNftName = string(abi.encodePacked(namePrefix, " ", nftSymbol));
    string memory bNftSymbol = string(abi.encodePacked(symbolPrefix, nftSymbol));
    initParams = abi.encodeWithSelector(IBNFT.initialize.selector, nftAsset, bNftName, bNftSymbol);
  }
  function _requireAddressIsERC721(address nftAsset) internal view {
    require(nftAsset != address(0), "BNFTR: asset is zero address");
    require(AddressUpgradeable.isContract(nftAsset), "BNFTR: asset is not contract");
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/transparent/ProxyAdmin.sol)
pragma solidity ^0.8.0;
import "./TransparentUpgradeableProxy.sol";
import "../../access/Ownable.sol";
/**
 * @dev This is an auxiliary contract meant to be assigned as the admin of a {TransparentUpgradeableProxy}. For an
 * explanation of why you would want to use this see the documentation for {TransparentUpgradeableProxy}.
 */
contract ProxyAdmin is Ownable {
    /**
     * @dev Returns the current implementation of `proxy`.
     *
     * Requirements:
     *
     * - This contract must be the admin of `proxy`.
     */
    function getProxyImplementation(TransparentUpgradeableProxy proxy) public view virtual returns (address) {
        // We need to manually run the static call since the getter cannot be flagged as view
        // bytes4(keccak256("implementation()")) == 0x5c60da1b
        (bool success, bytes memory returndata) = address(proxy).staticcall(hex"5c60da1b");
        require(success);
        return abi.decode(returndata, (address));
    }
    /**
     * @dev Returns the current admin of `proxy`.
     *
     * Requirements:
     *
     * - This contract must be the admin of `proxy`.
     */
    function getProxyAdmin(TransparentUpgradeableProxy proxy) public view virtual returns (address) {
        // We need to manually run the static call since the getter cannot be flagged as view
        // bytes4(keccak256("admin()")) == 0xf851a440
        (bool success, bytes memory returndata) = address(proxy).staticcall(hex"f851a440");
        require(success);
        return abi.decode(returndata, (address));
    }
    /**
     * @dev Changes the admin of `proxy` to `newAdmin`.
     *
     * Requirements:
     *
     * - This contract must be the current admin of `proxy`.
     */
    function changeProxyAdmin(TransparentUpgradeableProxy proxy, address newAdmin) public virtual onlyOwner {
        proxy.changeAdmin(newAdmin);
    }
    /**
     * @dev Upgrades `proxy` to `implementation`. See {TransparentUpgradeableProxy-upgradeTo}.
     *
     * Requirements:
     *
     * - This contract must be the admin of `proxy`.
     */
    function upgrade(TransparentUpgradeableProxy proxy, address implementation) public virtual onlyOwner {
        proxy.upgradeTo(implementation);
    }
    /**
     * @dev Upgrades `proxy` to `implementation` and calls a function on the new implementation. See
     * {TransparentUpgradeableProxy-upgradeToAndCall}.
     *
     * Requirements:
     *
     * - This contract must be the admin of `proxy`.
     */
    function upgradeAndCall(
        TransparentUpgradeableProxy proxy,
        address implementation,
        bytes memory data
    ) public payable virtual onlyOwner {
        proxy.upgradeToAndCall{value: msg.value}(implementation, data);
    }
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
import {ProxyAdmin} from "@openzeppelin/contracts/proxy/transparent/ProxyAdmin.sol";
contract BendProxyAdmin is ProxyAdmin {}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/ERC721.sol)
pragma solidity ^0.8.0;
import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";
/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;
    // Token name
    string private _name;
    // Token symbol
    string private _symbol;
    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;
    // Mapping owner address to token count
    mapping(address => uint256) private _balances;
    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;
    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;
    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }
    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _balances[owner];
    }
    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");
        return owner;
    }
    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }
    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }
    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }
    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overriden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }
    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");
        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );
        _approve(to, tokenId);
    }
    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");
        return _tokenApprovals[tokenId];
    }
    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }
    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }
    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _transfer(from, to, tokenId);
    }
    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }
    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }
    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }
    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }
    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }
    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }
    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");
        _beforeTokenTransfer(address(0), to, tokenId);
        _balances[to] += 1;
        _owners[tokenId] = to;
        emit Transfer(address(0), to, tokenId);
    }
    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);
        _beforeTokenTransfer(owner, address(0), tokenId);
        // Clear approvals
        _approve(address(0), tokenId);
        _balances[owner] -= 1;
        delete _owners[tokenId];
        emit Transfer(owner, address(0), tokenId);
    }
    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");
        _beforeTokenTransfer(from, to, tokenId);
        // Clear approvals from the previous owner
        _approve(address(0), tokenId);
        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;
        emit Transfer(from, to, tokenId);
    }
    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }
    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits a {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }
    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }
    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)
pragma solidity ^0.8.0;
/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)
pragma solidity ^0.8.0;
import "../IERC721.sol";
/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);
    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);
    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)
pragma solidity ^0.8.0;
/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }
    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }
    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)
pragma solidity ^0.8.0;
import "./IERC165.sol";
/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {ERC721} from "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import {ERC721Enumerable} from "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import {Pausable} from "@openzeppelin/contracts/security/Pausable.sol";
import {UserProxy} from "./UserProxy.sol";
import {ICryptoPunk} from "./ICryptoPunk.sol";
import {IWrappedPunks} from "../../interfaces/IWrappedPunks.sol";
contract WrappedPunk is IWrappedPunks, Ownable, ERC721Enumerable, Pausable {
  event ProxyRegistered(address user, address proxy);
  // Instance of cryptopunk smart contract
  ICryptoPunk private _punkContract;
  // Mapping from user address to proxy address
  mapping(address => address) private _proxies;
  /**
   * @dev Initializes the contract settings
   */
  constructor(address punkContract_) ERC721("Wrapped Cryptopunks", "WPUNKS") {
    _punkContract = ICryptoPunk(punkContract_);
  }
  /**
   * @dev Gets address of cryptopunk smart contract
   */
  function punkContract() public view override returns (address) {
    return address(_punkContract);
  }
  /**
   * @dev Registers proxy
   */
  function registerProxy() public override {
    address sender = _msgSender();
    require(_proxies[sender] == address(0), "PunkWrapper: caller has registered the proxy");
    address proxy = address(new UserProxy());
    _proxies[sender] = proxy;
    emit ProxyRegistered(sender, proxy);
  }
  /**
   * @dev Gets proxy address
   */
  function proxyInfo(address user) public view override returns (address) {
    return _proxies[user];
  }
  /**
   * @dev Mints a wrapped punk
   */
  function mint(uint256 punkIndex) public override whenNotPaused {
    address sender = _msgSender();
    UserProxy proxy = UserProxy(_proxies[sender]);
    require(proxy.transfer(address(_punkContract), punkIndex), "PunkWrapper: transfer fail");
    _mint(sender, punkIndex);
  }
  /**
   * @dev Burns a specific wrapped punk
   */
  function burn(uint256 punkIndex) public override whenNotPaused {
    address sender = _msgSender();
    require(_isApprovedOrOwner(sender, punkIndex), "PunkWrapper: caller is not owner nor approved");
    _burn(punkIndex);
    // Transfers ownership of punk on original cryptopunk smart contract to caller
    _punkContract.transferPunk(sender, punkIndex);
  }
  function _baseURI() internal view virtual override returns (string memory) {
    return "https://wrappedpunks.com:3000/api/punks/metadata/";
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Enumerable.sol)
pragma solidity ^0.8.0;
import "../ERC721.sol";
import "./IERC721Enumerable.sol";
/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;
    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;
    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;
    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
    }
    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }
    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _allTokens.length;
    }
    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }
    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);
        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }
    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }
    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }
    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).
        uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];
        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];
            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }
        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }
    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).
        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];
        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];
        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/Pausable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);
    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);
    bool private _paused;
    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }
    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }
    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }
    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }
    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }
    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
contract UserProxy {
  address private immutable _owner;
  /**
   * @dev Initializes the contract settings
   */
  constructor() {
    _owner = msg.sender;
  }
  /**
   * @dev Transfers punk to the smart contract owner
   */
  function transfer(address punkContract, uint256 punkIndex) external returns (bool) {
    if (_owner != msg.sender) {
      return false;
    }
    (bool result, ) = punkContract.call(abi.encodeWithSignature("transferPunk(address,uint256)", _owner, punkIndex));
    return result;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
interface ICryptoPunk {
  function punkIndexToAddress(uint256 punkIndex) external returns (address);
  function punksOfferedForSale(uint256 punkIndex)
    external
    returns (
      bool,
      uint256,
      address,
      uint256,
      address
    );
  function buyPunk(uint256 punkIndex) external payable;
  function transferPunk(address to, uint256 punkIndex) external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Enumerable.sol)
pragma solidity ^0.8.0;
import "../IERC721.sol";
/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);
    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ERC721} from "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import {ERC721Enumerable} from "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
/**
 * @title MintableERC721
 * @dev ERC721 minting logic
 */
contract MintableERC721 is ERC721Enumerable {
  string public baseURI;
  mapping(address => uint256) public mintCounts;
  constructor(string memory name, string memory symbol) ERC721(name, symbol) {
    baseURI = "https://MintableERC721/";
  }
  /**
   * @dev Function to mint tokens
   * @param tokenId The id of tokens to mint.
   * @return A boolean that indicates if the operation was successful.
   */
  function mint(uint256 tokenId) public returns (bool) {
    require(tokenId < 10000, "exceed mint limit");
    mintCounts[_msgSender()] += 1;
    require(mintCounts[_msgSender()] <= 10, "exceed mint limit");
    _mint(_msgSender(), tokenId);
    return true;
  }
  function _baseURI() internal view virtual override returns (string memory) {
    return baseURI;
  }
  function setBaseURI(string memory baseURI_) public {
    baseURI = baseURI_;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {Address} from "@openzeppelin/contracts/utils/Address.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {IERC721} from "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import {IERC721Enumerable} from "@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol";
import {IPunks} from "../interfaces/IPunks.sol";
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
import {ILendPool} from "../interfaces/ILendPool.sol";
import {ReserveConfiguration} from "../libraries/configuration/ReserveConfiguration.sol";
import {DataTypes} from "../libraries/types/DataTypes.sol";
/**
 * @title WalletBalanceProvider contract
 * @author Bend, influenced by https://github.com/wbobeirne/eth-balance-checker/blob/master/contracts/BalanceChecker.sol
 * @notice Implements a logic of getting multiple tokens balance for one user address
 * @dev NOTE: THIS CONTRACT IS NOT USED WITHIN THE BEND PROTOCOL. It's an accessory contract used to reduce the number of calls
 * towards the blockchain from the Bend backend.
 **/
contract WalletBalanceProvider {
  using Address for address payable;
  using Address for address;
  using SafeERC20 for IERC20;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  address constant MOCK_ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
  /**
    @dev Check the reserve balance of a wallet in a reserve contract
    Returns the balance of the reserve for user. Avoids possible errors:
      - return 0 on non-contract address
    **/
  function balanceOfReserve(address user, address token) public view returns (uint256) {
    if (token == MOCK_ETH_ADDRESS) {
      return user.balance; // ETH balance
      // check if token is actually a contract
    } else if (token.isContract()) {
      return IERC20(token).balanceOf(user);
    }
    revert("INVALID_TOKEN");
  }
  /**
   * @notice Fetches, for a list of _users and _tokens (ETH included with mock address), the balances
   * @param users The list of users
   * @param tokens The list of tokens
   * @return And array with the concatenation of, for each user, his/her balances
   **/
  function batchBalanceOfReserve(address[] calldata users, address[] calldata tokens)
    external
    view
    returns (uint256[] memory)
  {
    uint256[] memory balances = new uint256[](users.length * tokens.length);
    for (uint256 i = 0; i < users.length; i++) {
      for (uint256 j = 0; j < tokens.length; j++) {
        balances[i * tokens.length + j] = balanceOfReserve(users[i], tokens[j]);
      }
    }
    return balances;
  }
  /**
    @dev provides balances of user wallet for all reserves available on the pool
    */
  function getUserReservesBalances(address provider, address user)
    external
    view
    returns (address[] memory, uint256[] memory)
  {
    ILendPool pool = ILendPool(ILendPoolAddressesProvider(provider).getLendPool());
    address[] memory reserves = pool.getReservesList();
    address[] memory reservesWithEth = new address[](reserves.length + 1);
    for (uint256 i = 0; i < reserves.length; i++) {
      reservesWithEth[i] = reserves[i];
    }
    reservesWithEth[reserves.length] = MOCK_ETH_ADDRESS;
    uint256[] memory balances = new uint256[](reservesWithEth.length);
    for (uint256 j = 0; j < reserves.length; j++) {
      DataTypes.ReserveConfigurationMap memory configuration = pool.getReserveConfiguration(reservesWithEth[j]);
      (bool isActive, , , ) = configuration.getFlagsMemory();
      if (!isActive) {
        balances[j] = 0;
        continue;
      }
      balances[j] = balanceOfReserve(user, reservesWithEth[j]);
    }
    balances[reserves.length] = balanceOfReserve(user, MOCK_ETH_ADDRESS);
    return (reservesWithEth, balances);
  }
  /**
    @dev Check the nft balance of a wallet in a nft contract
    Returns the balance of the nft for user. Avoids possible errors:
      - return 0 on non-contract address
    **/
  function balanceOfNft(address user, address token) public view returns (uint256) {
    if (token.isContract()) {
      return IERC721(token).balanceOf(user);
    }
    revert("INVALID_TOKEN");
  }
  /**
   * @notice Fetches, for a list of _users and _tokens (ETH included with mock address), the balances
   * @param users The list of users
   * @param tokens The list of tokens
   * @return And array with the concatenation of, for each user, his/her balances
   **/
  function batchBalanceOfNft(address[] calldata users, address[] calldata tokens)
    external
    view
    returns (uint256[] memory)
  {
    uint256[] memory balances = new uint256[](users.length * tokens.length);
    for (uint256 i = 0; i < users.length; i++) {
      for (uint256 j = 0; j < tokens.length; j++) {
        balances[i * tokens.length + j] = balanceOfNft(users[i], tokens[j]);
      }
    }
    return balances;
  }
  /**
    @dev provides balances of user wallet for all nfts available on the pool
    */
  function getUserNftsBalances(address provider, address user)
    external
    view
    returns (address[] memory, uint256[] memory)
  {
    ILendPool pool = ILendPool(ILendPoolAddressesProvider(provider).getLendPool());
    address[] memory nfts = pool.getNftsList();
    uint256[] memory balances = new uint256[](nfts.length);
    for (uint256 j = 0; j < nfts.length; j++) {
      /*
      DataTypes.NftConfigurationMap memory configuration = pool.getNftConfiguration(nfts[j]);
      (bool isActive, ) = configuration.getFlagsMemory();
      if (!isActive) {
        balances[j] = 0;
        continue;
      }
      */
      balances[j] = balanceOfNft(user, nfts[j]);
    }
    return (nfts, balances);
  }
  /**
   * @dev Returns a token ID list owned by `owner`.
   * Requirements:
   *  - The `token` must be IERC721Enumerable contract address
   * @param owner The address of user
   * @param token The address of ERC721 contract
   */
  function batchTokenOfOwnerByIndex(address owner, address token) external view returns (uint256[] memory) {
    uint256 tokenBalances = IERC721Enumerable(token).balanceOf(owner);
    uint256[] memory tokenIds = new uint256[](tokenBalances);
    for (uint256 index = 0; index < tokenBalances; index++) {
      tokenIds[index] = IERC721Enumerable(token).tokenOfOwnerByIndex(owner, index);
    }
    return tokenIds;
  }
  /**
   * @dev Returns a token ID list owned by `owner`.
   * Requirements:
   *  - The `token` must be IERC721 contract address
   *  - The `start` plus `count` must be not greater than total supply
   *  - The transaction must not ran out of gas, `count` <= 2000
   * @param owner The address of user
   * @param token The address of ERC721 contract
   * @param start The starting token ID
   * @param count The scaning number
   */
  function batchTokenOfOwner(
    address owner,
    address token,
    uint256 start,
    uint256 count
  ) external view returns (uint256[] memory) {
    uint256 tokenBalances = IERC721(token).balanceOf(owner);
    uint256[] memory tokenIds = new uint256[](tokenBalances);
    uint256 pos = 0;
    uint256 maxTokenId = start + count;
    for (uint256 tokenId = 0; tokenId < maxTokenId; tokenId++) {
      try IERC721(token).ownerOf(tokenId) returns (address tokenOwner) {
        if (tokenOwner == owner) {
          tokenIds[pos] = tokenId;
          pos++;
          //avoid useless loop scan
          if (pos == tokenBalances) {
            return tokenIds;
          }
        }
      } catch Error(
        string memory /*reason*/
      ) {} catch (
        bytes memory /*lowLevelData*/
      ) {}
    }
    return tokenIds;
  }
  /**
   * @dev Returns a punk index list owned by `owner`.
   * Requirements:
   *  - The `punkContract` must be CryptoPunksMarket address
   *  - The `start` plus `count` must be not greater than total supply
   *  - The transaction must not ran out of gas, `count` <= 2000
   * @param owner The address of user
   * @param punkContract The address of punk contract
   * @param start The starting punk index
   * @param count The scaning number
   */
  function batchPunkOfOwner(
    address owner,
    address punkContract,
    uint256 start,
    uint256 count
  ) external view returns (uint256[] memory) {
    uint256 punkBalances = IPunks(punkContract).balanceOf(owner);
    uint256[] memory punkIndexs = new uint256[](punkBalances);
    uint256 pos = 0;
    uint256 maxIndex = start + count;
    for (uint256 punkIndex = 0; punkIndex < maxIndex; punkIndex++) {
      address ownerAddress = IPunks(punkContract).punkIndexToAddress(punkIndex);
      if (ownerAddress != owner) {
        continue;
      }
      punkIndexs[pos] = punkIndex;
      pos++;
      //avoid useless loop scan
      if (pos == punkBalances) {
        return punkIndexs;
      }
    }
    return punkIndexs;
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);
    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.0;
import "../IERC20.sol";
import "../../../utils/Address.sol";
/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;
    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }
    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }
    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }
    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }
    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.
        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IERC20Detailed} from "../interfaces/IERC20Detailed.sol";
import {IERC721Detailed} from "../interfaces/IERC721Detailed.sol";
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
import {IUiPoolDataProvider} from "../interfaces/IUiPoolDataProvider.sol";
import {ILendPool} from "../interfaces/ILendPool.sol";
import {ILendPoolLoan} from "../interfaces/ILendPoolLoan.sol";
import {IReserveOracleGetter} from "../interfaces/IReserveOracleGetter.sol";
import {INFTOracleGetter} from "../interfaces/INFTOracleGetter.sol";
import {IBToken} from "../interfaces/IBToken.sol";
import {IDebtToken} from "../interfaces/IDebtToken.sol";
import {WadRayMath} from "../libraries/math/WadRayMath.sol";
import {ReserveConfiguration} from "../libraries/configuration/ReserveConfiguration.sol";
import {NftConfiguration} from "../libraries/configuration/NftConfiguration.sol";
import {DataTypes} from "../libraries/types/DataTypes.sol";
import {InterestRate} from "../protocol/InterestRate.sol";
import {Errors} from "../libraries/helpers/Errors.sol";
contract UiPoolDataProvider is IUiPoolDataProvider {
  using WadRayMath for uint256;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  using NftConfiguration for DataTypes.NftConfigurationMap;
  IReserveOracleGetter public immutable reserveOracle;
  INFTOracleGetter public immutable nftOracle;
  constructor(IReserveOracleGetter _reserveOracle, INFTOracleGetter _nftOracle) {
    reserveOracle = _reserveOracle;
    nftOracle = _nftOracle;
  }
  function getInterestRateStrategySlopes(InterestRate interestRate) internal view returns (uint256, uint256) {
    return (interestRate.variableRateSlope1(), interestRate.variableRateSlope2());
  }
  function getReservesList(ILendPoolAddressesProvider provider) public view override returns (address[] memory) {
    ILendPool lendPool = ILendPool(provider.getLendPool());
    return lendPool.getReservesList();
  }
  function getSimpleReservesData(ILendPoolAddressesProvider provider)
    public
    view
    override
    returns (AggregatedReserveData[] memory)
  {
    ILendPool lendPool = ILendPool(provider.getLendPool());
    address[] memory reserves = lendPool.getReservesList();
    AggregatedReserveData[] memory reservesData = new AggregatedReserveData[](reserves.length);
    for (uint256 i = 0; i < reserves.length; i++) {
      AggregatedReserveData memory reserveData = reservesData[i];
      DataTypes.ReserveData memory baseData = lendPool.getReserveData(reserves[i]);
      _fillReserveData(reserveData, reserves[i], baseData);
    }
    return (reservesData);
  }
  function getUserReservesData(ILendPoolAddressesProvider provider, address user)
    external
    view
    override
    returns (UserReserveData[] memory)
  {
    ILendPool lendPool = ILendPool(provider.getLendPool());
    address[] memory reserves = lendPool.getReservesList();
    UserReserveData[] memory userReservesData = new UserReserveData[](user != address(0) ? reserves.length : 0);
    for (uint256 i = 0; i < reserves.length; i++) {
      DataTypes.ReserveData memory baseData = lendPool.getReserveData(reserves[i]);
      _fillUserReserveData(userReservesData[i], user, reserves[i], baseData);
    }
    return (userReservesData);
  }
  function getReservesData(ILendPoolAddressesProvider provider, address user)
    external
    view
    override
    returns (AggregatedReserveData[] memory, UserReserveData[] memory)
  {
    ILendPool lendPool = ILendPool(provider.getLendPool());
    address[] memory reserves = lendPool.getReservesList();
    AggregatedReserveData[] memory reservesData = new AggregatedReserveData[](reserves.length);
    UserReserveData[] memory userReservesData = new UserReserveData[](user != address(0) ? reserves.length : 0);
    for (uint256 i = 0; i < reserves.length; i++) {
      AggregatedReserveData memory reserveData = reservesData[i];
      DataTypes.ReserveData memory baseData = lendPool.getReserveData(reserves[i]);
      _fillReserveData(reserveData, reserves[i], baseData);
      if (user != address(0)) {
        _fillUserReserveData(userReservesData[i], user, reserves[i], baseData);
      }
    }
    return (reservesData, userReservesData);
  }
  function _fillReserveData(
    AggregatedReserveData memory reserveData,
    address reserveAsset,
    DataTypes.ReserveData memory baseData
  ) internal view {
    reserveData.underlyingAsset = reserveAsset;
    // reserve current state
    reserveData.liquidityIndex = baseData.liquidityIndex;
    reserveData.variableBorrowIndex = baseData.variableBorrowIndex;
    reserveData.liquidityRate = baseData.currentLiquidityRate;
    reserveData.variableBorrowRate = baseData.currentVariableBorrowRate;
    reserveData.lastUpdateTimestamp = baseData.lastUpdateTimestamp;
    reserveData.bTokenAddress = baseData.bTokenAddress;
    reserveData.debtTokenAddress = baseData.debtTokenAddress;
    reserveData.interestRateAddress = baseData.interestRateAddress;
    reserveData.priceInEth = reserveOracle.getAssetPrice(reserveData.underlyingAsset);
    reserveData.availableLiquidity = IERC20Detailed(reserveData.underlyingAsset).balanceOf(reserveData.bTokenAddress);
    reserveData.totalVariableDebt = IDebtToken(reserveData.debtTokenAddress).totalSupply();
    // reserve configuration
    reserveData.symbol = IERC20Detailed(reserveData.underlyingAsset).symbol();
    reserveData.name = IERC20Detailed(reserveData.underlyingAsset).name();
    (, , , reserveData.decimals, reserveData.reserveFactor) = baseData.configuration.getParamsMemory();
    (reserveData.isActive, reserveData.isFrozen, reserveData.borrowingEnabled, ) = baseData
      .configuration
      .getFlagsMemory();
    (reserveData.variableRateSlope1, reserveData.variableRateSlope2) = getInterestRateStrategySlopes(
      InterestRate(reserveData.interestRateAddress)
    );
  }
  function _fillUserReserveData(
    UserReserveData memory userReserveData,
    address user,
    address reserveAsset,
    DataTypes.ReserveData memory baseData
  ) internal view {
    // user reserve data
    userReserveData.underlyingAsset = reserveAsset;
    userReserveData.bTokenBalance = IBToken(baseData.bTokenAddress).balanceOf(user);
    userReserveData.variableDebt = IDebtToken(baseData.debtTokenAddress).balanceOf(user);
  }
  function getNftsList(ILendPoolAddressesProvider provider) external view override returns (address[] memory) {
    ILendPool lendPool = ILendPool(provider.getLendPool());
    return lendPool.getNftsList();
  }
  function getSimpleNftsData(ILendPoolAddressesProvider provider)
    external
    view
    override
    returns (AggregatedNftData[] memory)
  {
    ILendPool lendPool = ILendPool(provider.getLendPool());
    ILendPoolLoan lendPoolLoan = ILendPoolLoan(provider.getLendPoolLoan());
    address[] memory nfts = lendPool.getNftsList();
    AggregatedNftData[] memory nftsData = new AggregatedNftData[](nfts.length);
    for (uint256 i = 0; i < nfts.length; i++) {
      AggregatedNftData memory nftData = nftsData[i];
      DataTypes.NftData memory baseData = lendPool.getNftData(nfts[i]);
      _fillNftData(nftData, nfts[i], baseData, lendPoolLoan);
    }
    return (nftsData);
  }
  function getUserNftsData(ILendPoolAddressesProvider provider, address user)
    external
    view
    override
    returns (UserNftData[] memory)
  {
    ILendPool lendPool = ILendPool(provider.getLendPool());
    ILendPoolLoan lendPoolLoan = ILendPoolLoan(provider.getLendPoolLoan());
    address[] memory nfts = lendPool.getNftsList();
    UserNftData[] memory userNftsData = new UserNftData[](user != address(0) ? nfts.length : 0);
    for (uint256 i = 0; i < nfts.length; i++) {
      UserNftData memory userNftData = userNftsData[i];
      DataTypes.NftData memory baseData = lendPool.getNftData(nfts[i]);
      _fillUserNftData(userNftData, user, nfts[i], baseData, lendPoolLoan);
    }
    return (userNftsData);
  }
  // generic method with full data
  function getNftsData(ILendPoolAddressesProvider provider, address user)
    external
    view
    override
    returns (AggregatedNftData[] memory, UserNftData[] memory)
  {
    ILendPool lendPool = ILendPool(provider.getLendPool());
    ILendPoolLoan lendPoolLoan = ILendPoolLoan(provider.getLendPoolLoan());
    address[] memory nfts = lendPool.getNftsList();
    AggregatedNftData[] memory nftsData = new AggregatedNftData[](nfts.length);
    UserNftData[] memory userNftsData = new UserNftData[](user != address(0) ? nfts.length : 0);
    for (uint256 i = 0; i < nfts.length; i++) {
      AggregatedNftData memory nftData = nftsData[i];
      UserNftData memory userNftData = userNftsData[i];
      DataTypes.NftData memory baseData = lendPool.getNftData(nfts[i]);
      _fillNftData(nftData, nfts[i], baseData, lendPoolLoan);
      if (user != address(0)) {
        _fillUserNftData(userNftData, user, nfts[i], baseData, lendPoolLoan);
      }
    }
    return (nftsData, userNftsData);
  }
  function _fillNftData(
    AggregatedNftData memory nftData,
    address nftAsset,
    DataTypes.NftData memory baseData,
    ILendPoolLoan lendPoolLoan
  ) internal view {
    nftData.underlyingAsset = nftAsset;
    // nft current state
    nftData.bNftAddress = baseData.bNftAddress;
    nftData.priceInEth = nftOracle.getAssetPrice(nftData.underlyingAsset);
    nftData.totalCollateral = lendPoolLoan.getNftCollateralAmount(nftAsset);
    // nft configuration
    nftData.symbol = IERC721Detailed(nftData.underlyingAsset).symbol();
    nftData.name = IERC721Detailed(nftData.underlyingAsset).name();
    (nftData.ltv, nftData.liquidationThreshold, nftData.liquidationBonus) = baseData
      .configuration
      .getCollateralParamsMemory();
    (nftData.redeemDuration, nftData.auctionDuration, nftData.redeemFine, nftData.redeemThreshold) = baseData
      .configuration
      .getAuctionParamsMemory();
    (nftData.isActive, nftData.isFrozen) = baseData.configuration.getFlagsMemory();
  }
  function _fillUserNftData(
    UserNftData memory userNftData,
    address user,
    address nftAsset,
    DataTypes.NftData memory baseData,
    ILendPoolLoan lendPoolLoan
  ) internal view {
    userNftData.underlyingAsset = nftAsset;
    // user nft data
    userNftData.bNftAddress = baseData.bNftAddress;
    userNftData.totalCollateral = lendPoolLoan.getUserNftCollateralAmount(user, nftAsset);
  }
  function getSimpleLoansData(
    ILendPoolAddressesProvider provider,
    address[] memory nftAssets,
    uint256[] memory nftTokenIds
  ) external view override returns (AggregatedLoanData[] memory) {
    require(nftAssets.length == nftTokenIds.length, Errors.LP_INCONSISTENT_PARAMS);
    ILendPool lendPool = ILendPool(provider.getLendPool());
    ILendPoolLoan poolLoan = ILendPoolLoan(provider.getLendPoolLoan());
    AggregatedLoanData[] memory loansData = new AggregatedLoanData[](nftAssets.length);
    for (uint256 i = 0; i < nftAssets.length; i++) {
      AggregatedLoanData memory loanData = loansData[i];
      // NFT debt data
      (
        loanData.loanId,
        loanData.reserveAsset,
        loanData.totalCollateralInReserve,
        loanData.totalDebtInReserve,
        loanData.availableBorrowsInReserve,
        loanData.healthFactor
      ) = lendPool.getNftDebtData(nftAssets[i], nftTokenIds[i]);
      DataTypes.LoanData memory loan = poolLoan.getLoan(loanData.loanId);
      loanData.state = uint256(loan.state);
      (loanData.liquidatePrice, ) = lendPool.getNftLiquidatePrice(nftAssets[i], nftTokenIds[i]);
      // NFT auction data
      (, loanData.bidderAddress, loanData.bidPrice, loanData.bidBorrowAmount, loanData.bidFine) = lendPool
        .getNftAuctionData(nftAssets[i], nftTokenIds[i]);
    }
    return loansData;
  }
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
import {IERC20MetadataUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/IERC20MetadataUpgradeable.sol";
/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 */
interface IERC20Detailed is IERC20MetadataUpgradeable {
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.4;
import {IERC721MetadataUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/extensions/IERC721MetadataUpgradeable.sol";
/**
 * @dev Interface for the optional metadata functions from the ERC721 standard.
 */
interface IERC721Detailed is IERC721MetadataUpgradeable {
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ILendPoolAddressesProvider} from "./ILendPoolAddressesProvider.sol";
import {IIncentivesController} from "./IIncentivesController.sol";
interface IUiPoolDataProvider {
  struct AggregatedReserveData {
    address underlyingAsset;
    string name;
    string symbol;
    uint256 decimals;
    uint256 reserveFactor;
    bool borrowingEnabled;
    bool isActive;
    bool isFrozen;
    // base data
    uint128 liquidityIndex;
    uint128 variableBorrowIndex;
    uint128 liquidityRate;
    uint128 variableBorrowRate;
    uint40 lastUpdateTimestamp;
    address bTokenAddress;
    address debtTokenAddress;
    address interestRateAddress;
    //
    uint256 availableLiquidity;
    uint256 totalVariableDebt;
    uint256 priceInEth;
    uint256 variableRateSlope1;
    uint256 variableRateSlope2;
  }
  struct UserReserveData {
    address underlyingAsset;
    uint256 bTokenBalance;
    uint256 variableDebt;
  }
  struct AggregatedNftData {
    address underlyingAsset;
    string name;
    string symbol;
    uint256 ltv;
    uint256 liquidationThreshold;
    uint256 liquidationBonus;
    uint256 redeemDuration;
    uint256 auctionDuration;
    uint256 redeemFine;
    uint256 redeemThreshold;
    bool isActive;
    bool isFrozen;
    address bNftAddress;
    uint256 priceInEth;
    uint256 totalCollateral;
  }
  struct UserNftData {
    address underlyingAsset;
    address bNftAddress;
    uint256 totalCollateral;
  }
  struct AggregatedLoanData {
    uint256 loanId;
    uint256 state;
    address reserveAsset;
    uint256 totalCollateralInReserve;
    uint256 totalDebtInReserve;
    uint256 availableBorrowsInReserve;
    uint256 healthFactor;
    uint256 liquidatePrice;
    address bidderAddress;
    uint256 bidPrice;
    uint256 bidBorrowAmount;
    uint256 bidFine;
  }
  function getReservesList(ILendPoolAddressesProvider provider) external view returns (address[] memory);
  function getSimpleReservesData(ILendPoolAddressesProvider provider)
    external
    view
    returns (AggregatedReserveData[] memory);
  function getUserReservesData(ILendPoolAddressesProvider provider, address user)
    external
    view
    returns (UserReserveData[] memory);
  // generic method with full data
  function getReservesData(ILendPoolAddressesProvider provider, address user)
    external
    view
    returns (AggregatedReserveData[] memory, UserReserveData[] memory);
  function getNftsList(ILendPoolAddressesProvider provider) external view returns (address[] memory);
  function getSimpleNftsData(ILendPoolAddressesProvider provider) external view returns (AggregatedNftData[] memory);
  function getUserNftsData(ILendPoolAddressesProvider provider, address user)
    external
    view
    returns (UserNftData[] memory);
  // generic method with full data
  function getNftsData(ILendPoolAddressesProvider provider, address user)
    external
    view
    returns (AggregatedNftData[] memory, UserNftData[] memory);
  function getSimpleLoansData(
    ILendPoolAddressesProvider provider,
    address[] memory nftAssets,
    uint256[] memory nftTokenIds
  ) external view returns (AggregatedLoanData[] memory);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IInterestRate} from "../interfaces/IInterestRate.sol";
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
import {WadRayMath} from "../libraries/math/WadRayMath.sol";
import {PercentageMath} from "../libraries/math/PercentageMath.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
/**
 * @title InterestRate contract
 * @notice Implements the calculation of the interest rates depending on the reserve state
 * @dev The model of interest rate is based on 2 slopes, one before the `OPTIMAL_UTILIZATION_RATE`
 * point of utilization and another from that one to 100%
 * @author Bend
 **/
contract InterestRate is IInterestRate {
  using WadRayMath for uint256;
  using PercentageMath for uint256;
  ILendPoolAddressesProvider public immutable addressesProvider;
  /**
   * @dev this constant represents the utilization rate at which the pool aims to obtain most competitive borrow rates.
   * Expressed in ray
   **/
  uint256 public immutable OPTIMAL_UTILIZATION_RATE;
  /**
   * @dev This constant represents the excess utilization rate above the optimal. It's always equal to
   * 1-optimal utilization rate. Added as a constant here for gas optimizations.
   * Expressed in ray
   **/
  uint256 public immutable EXCESS_UTILIZATION_RATE;
  // Base variable borrow rate when Utilization rate = 0. Expressed in ray
  uint256 internal immutable _baseVariableBorrowRate;
  // Slope of the variable interest curve when utilization rate > 0 and <= OPTIMAL_UTILIZATION_RATE. Expressed in ray
  uint256 internal immutable _variableRateSlope1;
  // Slope of the variable interest curve when utilization rate > OPTIMAL_UTILIZATION_RATE. Expressed in ray
  uint256 internal immutable _variableRateSlope2;
  constructor(
    ILendPoolAddressesProvider provider,
    uint256 optimalUtilizationRate_,
    uint256 baseVariableBorrowRate_,
    uint256 variableRateSlope1_,
    uint256 variableRateSlope2_
  ) {
    addressesProvider = provider;
    OPTIMAL_UTILIZATION_RATE = optimalUtilizationRate_;
    EXCESS_UTILIZATION_RATE = WadRayMath.ray() - (optimalUtilizationRate_);
    _baseVariableBorrowRate = baseVariableBorrowRate_;
    _variableRateSlope1 = variableRateSlope1_;
    _variableRateSlope2 = variableRateSlope2_;
  }
  function variableRateSlope1() external view returns (uint256) {
    return _variableRateSlope1;
  }
  function variableRateSlope2() external view returns (uint256) {
    return _variableRateSlope2;
  }
  function baseVariableBorrowRate() external view override returns (uint256) {
    return _baseVariableBorrowRate;
  }
  function getMaxVariableBorrowRate() external view override returns (uint256) {
    return _baseVariableBorrowRate + (_variableRateSlope1) + (_variableRateSlope2);
  }
  /**
   * @dev Calculates the interest rates depending on the reserve's state and configurations
   * @param reserve The address of the reserve
   * @param liquidityAdded The liquidity added during the operation
   * @param liquidityTaken The liquidity taken during the operation
   * @param totalVariableDebt The total borrowed from the reserve at a variable rate
   * @param reserveFactor The reserve portion of the interest that goes to the treasury of the market
   * @return The liquidity rate, the stable borrow rate and the variable borrow rate
   **/
  function calculateInterestRates(
    address reserve,
    address bToken,
    uint256 liquidityAdded,
    uint256 liquidityTaken,
    uint256 totalVariableDebt,
    uint256 reserveFactor
  ) external view override returns (uint256, uint256) {
    uint256 availableLiquidity = IERC20Upgradeable(reserve).balanceOf(bToken);
    //avoid stack too deep
    availableLiquidity = availableLiquidity + (liquidityAdded) - (liquidityTaken);
    return calculateInterestRates(reserve, availableLiquidity, totalVariableDebt, reserveFactor);
  }
  struct CalcInterestRatesLocalVars {
    uint256 totalDebt;
    uint256 currentVariableBorrowRate;
    uint256 currentLiquidityRate;
    uint256 utilizationRate;
  }
  /**
   * @dev Calculates the interest rates depending on the reserve's state and configurations.
   * NOTE This function is kept for compatibility with the previous DefaultInterestRateStrategy interface.
   * New protocol implementation uses the new calculateInterestRates() interface
   * @param reserve The address of the reserve
   * @param availableLiquidity The liquidity available in the corresponding bToken
   * @param totalVariableDebt The total borrowed from the reserve at a variable rate
   * @param reserveFactor The reserve portion of the interest that goes to the treasury of the market
   * @return The liquidity rate and the variable borrow rate
   **/
  function calculateInterestRates(
    address reserve,
    uint256 availableLiquidity,
    uint256 totalVariableDebt,
    uint256 reserveFactor
  ) public view override returns (uint256, uint256) {
    reserve;
    CalcInterestRatesLocalVars memory vars;
    vars.totalDebt = totalVariableDebt;
    vars.currentVariableBorrowRate = 0;
    vars.currentLiquidityRate = 0;
    vars.utilizationRate = vars.totalDebt == 0 ? 0 : vars.totalDebt.rayDiv(availableLiquidity + (vars.totalDebt));
    if (vars.utilizationRate > OPTIMAL_UTILIZATION_RATE) {
      uint256 excessUtilizationRateRatio = (vars.utilizationRate - (OPTIMAL_UTILIZATION_RATE)).rayDiv(
        EXCESS_UTILIZATION_RATE
      );
      vars.currentVariableBorrowRate =
        _baseVariableBorrowRate +
        (_variableRateSlope1) +
        (_variableRateSlope2.rayMul(excessUtilizationRateRatio));
    } else {
      vars.currentVariableBorrowRate =
        _baseVariableBorrowRate +
        (vars.utilizationRate.rayMul(_variableRateSlope1).rayDiv(OPTIMAL_UTILIZATION_RATE));
    }
    vars.currentLiquidityRate = _getOverallBorrowRate(totalVariableDebt, vars.currentVariableBorrowRate)
      .rayMul(vars.utilizationRate)
      .percentMul(PercentageMath.PERCENTAGE_FACTOR - (reserveFactor));
    return (vars.currentLiquidityRate, vars.currentVariableBorrowRate);
  }
  /**
   * @dev Calculates the overall borrow rate as the weighted average between the total variable debt and total stable debt
   * @param totalVariableDebt The total borrowed from the reserve at a variable rate
   * @param currentVariableBorrowRate The current variable borrow rate of the reserve
   * @return The weighted averaged borrow rate
   **/
  function _getOverallBorrowRate(uint256 totalVariableDebt, uint256 currentVariableBorrowRate)
    internal
    pure
    returns (uint256)
  {
    uint256 totalDebt = totalVariableDebt;
    if (totalDebt == 0) return 0;
    uint256 weightedVariableRate = totalVariableDebt.wadToRay().rayMul(currentVariableBorrowRate);
    uint256 overallBorrowRate = weightedVariableRate.rayDiv(totalDebt.wadToRay());
    return overallBorrowRate;
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/ERC20.sol)
pragma solidity ^0.8.0;
import "./IERC20Upgradeable.sol";
import "./extensions/IERC20MetadataUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import "../../proxy/utils/Initializable.sol";
/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20Upgradeable is Initializable, ContextUpgradeable, IERC20Upgradeable, IERC20MetadataUpgradeable {
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    uint256 private _totalSupply;
    string private _name;
    string private _symbol;
    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    function __ERC20_init(string memory name_, string memory symbol_) internal onlyInitializing {
        __Context_init_unchained();
        __ERC20_init_unchained(name_, symbol_);
    }
    function __ERC20_init_unchained(string memory name_, string memory symbol_) internal onlyInitializing {
        _name = name_;
        _symbol = symbol_;
    }
    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }
    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }
    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }
    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }
    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }
    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }
    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }
    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }
        return true;
    }
    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }
    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }
        return true;
    }
    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        _beforeTokenTransfer(sender, recipient, amount);
        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;
        emit Transfer(sender, recipient, amount);
        _afterTokenTransfer(sender, recipient, amount);
    }
    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");
        _beforeTokenTransfer(address(0), account, amount);
        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);
        _afterTokenTransfer(address(0), account, amount);
    }
    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");
        _beforeTokenTransfer(account, address(0), amount);
        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;
        emit Transfer(account, address(0), amount);
        _afterTokenTransfer(account, address(0), amount);
    }
    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
    uint256[45] private __gap;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IIncentivesController} from "../interfaces/IIncentivesController.sol";
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
import {Initializable} from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import {ERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {IERC20MetadataUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/IERC20MetadataUpgradeable.sol";
/**
 * @title IncentivizedERC20
 * @notice Add Incentivized Logic to ERC20 implementation
 * @author Bend
 **/
abstract contract IncentivizedERC20 is Initializable, IERC20MetadataUpgradeable, ERC20Upgradeable {
  uint8 private _customDecimals;
  function __IncentivizedERC20_init(
    string memory name_,
    string memory symbol_,
    uint8 decimals_
  ) internal initializer {
    __ERC20_init(name_, symbol_);
    _customDecimals = decimals_;
  }
  /**
   * @dev Returns the decimals of the token.
   */
  function decimals() public view virtual override(ERC20Upgradeable, IERC20MetadataUpgradeable) returns (uint8) {
    return _customDecimals;
  }
  /**
   * @return Abstract function implemented by the child bToken/debtToken.
   * Done this way in order to not break compatibility with previous versions of bTokens/debtTokens
   **/
  function _getIncentivesController() internal view virtual returns (IIncentivesController);
  function _getUnderlyingAssetAddress() internal view virtual returns (address);
  function _transfer(
    address sender,
    address recipient,
    uint256 amount
  ) internal virtual override {
    uint256 oldSenderBalance = super.balanceOf(sender);
    uint256 oldRecipientBalance = super.balanceOf(recipient);
    super._transfer(sender, recipient, amount);
    if (address(_getIncentivesController()) != address(0)) {
      uint256 currentTotalSupply = super.totalSupply();
      _getIncentivesController().handleAction(sender, currentTotalSupply, oldSenderBalance);
      if (sender != recipient) {
        _getIncentivesController().handleAction(recipient, currentTotalSupply, oldRecipientBalance);
      }
    }
  }
  function _mint(address account, uint256 amount) internal virtual override {
    uint256 oldTotalSupply = super.totalSupply();
    uint256 oldAccountBalance = super.balanceOf(account);
    super._mint(account, amount);
    if (address(_getIncentivesController()) != address(0)) {
      _getIncentivesController().handleAction(account, oldTotalSupply, oldAccountBalance);
    }
  }
  function _burn(address account, uint256 amount) internal virtual override {
    uint256 oldTotalSupply = super.totalSupply();
    uint256 oldAccountBalance = super.balanceOf(account);
    super._burn(account, amount);
    if (address(_getIncentivesController()) != address(0)) {
      _getIncentivesController().handleAction(account, oldTotalSupply, oldAccountBalance);
    }
  }
  uint256[45] private __gap;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IDebtToken} from "../interfaces/IDebtToken.sol";
import {ILendPool} from "../interfaces/ILendPool.sol";
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
import {ILendPoolConfigurator} from "../interfaces/ILendPoolConfigurator.sol";
import {IIncentivesController} from "../interfaces/IIncentivesController.sol";
import {IncentivizedERC20} from "./IncentivizedERC20.sol";
import {WadRayMath} from "../libraries/math/WadRayMath.sol";
import {Errors} from "../libraries/helpers/Errors.sol";
import {Initializable} from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
/**
 * @title DebtToken
 * @notice Implements a debt token to track the borrowing positions of users
 * @author Bend
 **/
contract DebtToken is Initializable, IDebtToken, IncentivizedERC20 {
  using WadRayMath for uint256;
  ILendPoolAddressesProvider internal _addressProvider;
  address internal _underlyingAsset;
  mapping(address => mapping(address => uint256)) internal _borrowAllowances;
  modifier onlyLendPool() {
    require(_msgSender() == address(_getLendPool()), Errors.CT_CALLER_MUST_BE_LEND_POOL);
    _;
  }
  modifier onlyLendPoolConfigurator() {
    require(_msgSender() == address(_getLendPoolConfigurator()), Errors.LP_CALLER_NOT_LEND_POOL_CONFIGURATOR);
    _;
  }
  event BorrowAllowanceDelegated(address indexed fromUser, address indexed toUser, address asset, uint256 amount);
  /**
   * @dev Initializes the debt token.
   * @param addressProvider The address of the lend pool
   * @param underlyingAsset The address of the underlying asset
   * @param debtTokenDecimals The decimals of the debtToken, same as the underlying asset's
   * @param debtTokenName The name of the token
   * @param debtTokenSymbol The symbol of the token
   */
  function initialize(
    ILendPoolAddressesProvider addressProvider,
    address underlyingAsset,
    uint8 debtTokenDecimals,
    string memory debtTokenName,
    string memory debtTokenSymbol
  ) public override initializer {
    __IncentivizedERC20_init(debtTokenName, debtTokenSymbol, debtTokenDecimals);
    _underlyingAsset = underlyingAsset;
    _addressProvider = addressProvider;
    emit Initialized(
      underlyingAsset,
      address(_getLendPool()),
      address(_getIncentivesController()),
      debtTokenDecimals,
      debtTokenName,
      debtTokenSymbol
    );
  }
  /**
   * @dev Mints debt token to the `user` address
   * -  Only callable by the LendPool
   * @param initiator The address calling borrow
   * @param amount The amount of debt being minted
   * @param index The variable debt index of the reserve
   * @return `true` if the the previous balance of the user is 0
   **/
  function mint(
    address initiator,
    address onBehalfOf,
    uint256 amount,
    uint256 index
  ) external override onlyLendPool returns (bool) {
    if (initiator != onBehalfOf) {
      _decreaseBorrowAllowance(onBehalfOf, initiator, amount);
    }
    uint256 previousBalance = super.balanceOf(onBehalfOf);
    // index is expressed in Ray, so:
    // amount.wadToRay().rayDiv(index).rayToWad() => amount.rayDiv(index)
    uint256 amountScaled = amount.rayDiv(index);
    require(amountScaled != 0, Errors.CT_INVALID_MINT_AMOUNT);
    _mint(onBehalfOf, amountScaled);
    emit Transfer(address(0), onBehalfOf, amount);
    emit Mint(onBehalfOf, amount, index);
    return previousBalance == 0;
  }
  /**
   * @dev Burns user variable debt
   * - Only callable by the LendPool
   * @param user The user whose debt is getting burned
   * @param amount The amount getting burned
   * @param index The variable debt index of the reserve
   **/
  function burn(
    address user,
    uint256 amount,
    uint256 index
  ) external override onlyLendPool {
    uint256 amountScaled = amount.rayDiv(index);
    require(amountScaled != 0, Errors.CT_INVALID_BURN_AMOUNT);
    _burn(user, amountScaled);
    emit Transfer(user, address(0), amount);
    emit Burn(user, amount, index);
  }
  /**
   * @dev Calculates the accumulated debt balance of the user
   * @return The debt balance of the user
   **/
  function balanceOf(address user) public view virtual override returns (uint256) {
    uint256 scaledBalance = super.balanceOf(user);
    if (scaledBalance == 0) {
      return 0;
    }
    ILendPool pool = _getLendPool();
    return scaledBalance.rayMul(pool.getReserveNormalizedVariableDebt(_underlyingAsset));
  }
  /**
   * @dev Returns the principal debt balance of the user from
   * @return The debt balance of the user since the last burn/mint action
   **/
  function scaledBalanceOf(address user) public view virtual override returns (uint256) {
    return super.balanceOf(user);
  }
  /**
   * @dev Returns the total supply of the variable debt token. Represents the total debt accrued by the users
   * @return The total supply
   **/
  function totalSupply() public view virtual override returns (uint256) {
    ILendPool pool = _getLendPool();
    return super.totalSupply().rayMul(pool.getReserveNormalizedVariableDebt(_underlyingAsset));
  }
  /**
   * @dev Returns the scaled total supply of the variable debt token. Represents sum(debt/index)
   * @return the scaled total supply
   **/
  function scaledTotalSupply() public view virtual override returns (uint256) {
    return super.totalSupply();
  }
  /**
   * @dev Returns the principal balance of the user and principal total supply.
   * @param user The address of the user
   * @return The principal balance of the user
   * @return The principal total supply
   **/
  function getScaledUserBalanceAndSupply(address user) external view override returns (uint256, uint256) {
    return (super.balanceOf(user), super.totalSupply());
  }
  /**
   * @dev Returns the address of the underlying asset of this bToken
   **/
  function UNDERLYING_ASSET_ADDRESS() public view returns (address) {
    return _underlyingAsset;
  }
  /**
   * @dev Returns the address of the incentives controller contract
   **/
  function getIncentivesController() external view override returns (IIncentivesController) {
    return _getIncentivesController();
  }
  /**
   * @dev Returns the address of the lend pool where this token is used
   **/
  function POOL() public view returns (ILendPool) {
    return _getLendPool();
  }
  function _getIncentivesController() internal view override returns (IIncentivesController) {
    return IIncentivesController(_addressProvider.getIncentivesController());
  }
  function _getUnderlyingAssetAddress() internal view override returns (address) {
    return _underlyingAsset;
  }
  function _getLendPool() internal view returns (ILendPool) {
    return ILendPool(_addressProvider.getLendPool());
  }
  function _getLendPoolConfigurator() internal view returns (ILendPoolConfigurator) {
    return ILendPoolConfigurator(_addressProvider.getLendPoolConfigurator());
  }
  /**
   * @dev Being non transferrable, the debt token does not implement any of the
   * standard ERC20 functions for transfer and allowance.
   **/
  function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
    recipient;
    amount;
    revert("TRANSFER_NOT_SUPPORTED");
  }
  function allowance(address owner, address spender) public view virtual override returns (uint256) {
    owner;
    spender;
    revert("ALLOWANCE_NOT_SUPPORTED");
  }
  function approve(address spender, uint256 amount) public virtual override returns (bool) {
    spender;
    amount;
    revert("APPROVAL_NOT_SUPPORTED");
  }
  function transferFrom(
    address sender,
    address recipient,
    uint256 amount
  ) public virtual override returns (bool) {
    sender;
    recipient;
    amount;
    revert("TRANSFER_NOT_SUPPORTED");
  }
  function increaseAllowance(address spender, uint256 addedValue) public virtual override returns (bool) {
    spender;
    addedValue;
    revert("ALLOWANCE_NOT_SUPPORTED");
  }
  function decreaseAllowance(address spender, uint256 subtractedValue) public virtual override returns (bool) {
    spender;
    subtractedValue;
    revert("ALLOWANCE_NOT_SUPPORTED");
  }
  /**
   * @dev delegates borrowing power to a user on the specific debt token
   * @param delegatee the address receiving the delegated borrowing power
   * @param amount the maximum amount being delegated. Delegation will still
   * respect the liquidation constraints (even if delegated, a delegatee cannot
   * force a delegator HF to go below 1)
   **/
  function approveDelegation(address delegatee, uint256 amount) external override {
    _borrowAllowances[_msgSender()][delegatee] = amount;
    emit BorrowAllowanceDelegated(_msgSender(), delegatee, _getUnderlyingAssetAddress(), amount);
  }
  /**
   * @dev returns the borrow allowance of the user
   * @param fromUser The user to giving allowance
   * @param toUser The user to give allowance to
   * @return the current allowance of toUser
   **/
  function borrowAllowance(address fromUser, address toUser) external view override returns (uint256) {
    return _borrowAllowances[fromUser][toUser];
  }
  function _decreaseBorrowAllowance(
    address delegator,
    address delegatee,
    uint256 amount
  ) internal {
    require(_borrowAllowances[delegator][delegatee] >= amount, Errors.CT_BORROW_ALLOWANCE_NOT_ENOUGH);
    uint256 newAllowance = _borrowAllowances[delegator][delegatee] - amount;
    _borrowAllowances[delegator][delegatee] = newAllowance;
    emit BorrowAllowanceDelegated(delegator, delegatee, _getUnderlyingAssetAddress(), newAllowance);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
import {ILendPoolConfigurator} from "../interfaces/ILendPoolConfigurator.sol";
import {ILendPool} from "../interfaces/ILendPool.sol";
import {IBToken} from "../interfaces/IBToken.sol";
import {IIncentivesController} from "../interfaces/IIncentivesController.sol";
import {IncentivizedERC20} from "./IncentivizedERC20.sol";
import {WadRayMath} from "../libraries/math/WadRayMath.sol";
import {Errors} from "../libraries/helpers/Errors.sol";
import {Initializable} from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
/**
 * @title ERC20 BToken
 * @dev Implementation of the interest bearing token for the Bend protocol
 * @author Bend
 */
contract BToken is Initializable, IBToken, IncentivizedERC20 {
  using WadRayMath for uint256;
  using SafeERC20Upgradeable for IERC20Upgradeable;
  ILendPoolAddressesProvider internal _addressProvider;
  address internal _treasury;
  address internal _underlyingAsset;
  modifier onlyLendPool() {
    require(_msgSender() == address(_getLendPool()), Errors.CT_CALLER_MUST_BE_LEND_POOL);
    _;
  }
  modifier onlyLendPoolConfigurator() {
    require(_msgSender() == address(_getLendPoolConfigurator()), Errors.LP_CALLER_NOT_LEND_POOL_CONFIGURATOR);
    _;
  }
  /**
   * @dev Initializes the bToken
   * @param addressProvider The address of the address provider where this bToken will be used
   * @param treasury The address of the Bend treasury, receiving the fees on this bToken
   * @param underlyingAsset The address of the underlying asset of this bToken
   */
  function initialize(
    ILendPoolAddressesProvider addressProvider,
    address treasury,
    address underlyingAsset,
    uint8 bTokenDecimals,
    string calldata bTokenName,
    string calldata bTokenSymbol
  ) external override initializer {
    __IncentivizedERC20_init(bTokenName, bTokenSymbol, bTokenDecimals);
    _treasury = treasury;
    _underlyingAsset = underlyingAsset;
    _addressProvider = addressProvider;
    emit Initialized(
      underlyingAsset,
      _addressProvider.getLendPool(),
      treasury,
      _addressProvider.getIncentivesController()
    );
  }
  /**
   * @dev Burns bTokens from `user` and sends the equivalent amount of underlying to `receiverOfUnderlying`
   * - Only callable by the LendPool, as extra state updates there need to be managed
   * @param user The owner of the bTokens, getting them burned
   * @param receiverOfUnderlying The address that will receive the underlying
   * @param amount The amount being burned
   * @param index The new liquidity index of the reserve
   **/
  function burn(
    address user,
    address receiverOfUnderlying,
    uint256 amount,
    uint256 index
  ) external override onlyLendPool {
    uint256 amountScaled = amount.rayDiv(index);
    require(amountScaled != 0, Errors.CT_INVALID_BURN_AMOUNT);
    _burn(user, amountScaled);
    IERC20Upgradeable(_underlyingAsset).safeTransfer(receiverOfUnderlying, amount);
    emit Burn(user, receiverOfUnderlying, amount, index);
  }
  /**
   * @dev Mints `amount` bTokens to `user`
   * - Only callable by the LendPool, as extra state updates there need to be managed
   * @param user The address receiving the minted tokens
   * @param amount The amount of tokens getting minted
   * @param index The new liquidity index of the reserve
   * @return `true` if the the previous balance of the user was 0
   */
  function mint(
    address user,
    uint256 amount,
    uint256 index
  ) external override onlyLendPool returns (bool) {
    uint256 previousBalance = super.balanceOf(user);
    // index is expressed in Ray, so:
    // amount.wadToRay().rayDiv(index).rayToWad() => amount.rayDiv(index)
    uint256 amountScaled = amount.rayDiv(index);
    require(amountScaled != 0, Errors.CT_INVALID_MINT_AMOUNT);
    _mint(user, amountScaled);
    emit Mint(user, amount, index);
    return previousBalance == 0;
  }
  /**
   * @dev Mints bTokens to the reserve treasury
   * - Only callable by the LendPool
   * @param amount The amount of tokens getting minted
   * @param index The new liquidity index of the reserve
   */
  function mintToTreasury(uint256 amount, uint256 index) external override onlyLendPool {
    if (amount == 0) {
      return;
    }
    address treasury = _treasury;
    // Compared to the normal mint, we don't check for rounding errors.
    // The amount to mint can easily be very small since it is a fraction of the interest ccrued.
    // In that case, the treasury will experience a (very small) loss, but it
    // wont cause potentially valid transactions to fail.
    _mint(treasury, amount.rayDiv(index));
    emit Transfer(address(0), treasury, amount);
    emit Mint(treasury, amount, index);
  }
  /**
   * @dev Calculates the balance of the user: principal balance + interest generated by the principal
   * @param user The user whose balance is calculated
   * @return The balance of the user
   **/
  function balanceOf(address user) public view override returns (uint256) {
    ILendPool pool = _getLendPool();
    return super.balanceOf(user).rayMul(pool.getReserveNormalizedIncome(_underlyingAsset));
  }
  /**
   * @dev Returns the scaled balance of the user. The scaled balance is the sum of all the
   * updated stored balance divided by the reserve's liquidity index at the moment of the update
   * @param user The user whose balance is calculated
   * @return The scaled balance of the user
   **/
  function scaledBalanceOf(address user) external view override returns (uint256) {
    return super.balanceOf(user);
  }
  /**
   * @dev Returns the scaled balance of the user and the scaled total supply.
   * @param user The address of the user
   * @return The scaled balance of the user
   * @return The scaled balance and the scaled total supply
   **/
  function getScaledUserBalanceAndSupply(address user) external view override returns (uint256, uint256) {
    return (super.balanceOf(user), super.totalSupply());
  }
  /**
   * @dev calculates the total supply of the specific bToken
   * since the balance of every single user increases over time, the total supply
   * does that too.
   * @return the current total supply
   **/
  function totalSupply() public view override returns (uint256) {
    uint256 currentSupplyScaled = super.totalSupply();
    if (currentSupplyScaled == 0) {
      return 0;
    }
    ILendPool pool = _getLendPool();
    return currentSupplyScaled.rayMul(pool.getReserveNormalizedIncome(_underlyingAsset));
  }
  /**
   * @dev Returns the scaled total supply of the variable debt token. Represents sum(debt/index)
   * @return the scaled total supply
   **/
  function scaledTotalSupply() public view virtual override returns (uint256) {
    return super.totalSupply();
  }
  /**
   * @dev Returns the address of the Bend treasury, receiving the fees on this bToken
   **/
  function RESERVE_TREASURY_ADDRESS() public view returns (address) {
    return _treasury;
  }
  /**
   * @dev Returns the address of the underlying asset of this bToken
   **/
  function UNDERLYING_ASSET_ADDRESS() public view override returns (address) {
    return _underlyingAsset;
  }
  /**
   * @dev Returns the address of the lending pool where this bToken is used
   **/
  function POOL() public view returns (ILendPool) {
    return _getLendPool();
  }
  /**
   * @dev For internal usage in the logic of the parent contract IncentivizedERC20
   **/
  function _getIncentivesController() internal view override returns (IIncentivesController) {
    return IIncentivesController(_addressProvider.getIncentivesController());
  }
  function _getUnderlyingAssetAddress() internal view override returns (address) {
    return _underlyingAsset;
  }
  /**
   * @dev Returns the address of the incentives controller contract
   **/
  function getIncentivesController() external view override returns (IIncentivesController) {
    return _getIncentivesController();
  }
  /**
   * @dev Transfers the underlying asset to `target`. Used by the LendPool to transfer
   * assets in borrow(), withdraw() and flashLoan()
   * @param target The recipient of the bTokens
   * @param amount The amount getting transferred
   * @return The amount transferred
   **/
  function transferUnderlyingTo(address target, uint256 amount) external override onlyLendPool returns (uint256) {
    IERC20Upgradeable(_underlyingAsset).safeTransfer(target, amount);
    return amount;
  }
  function _getLendPool() internal view returns (ILendPool) {
    return ILendPool(_addressProvider.getLendPool());
  }
  function _getLendPoolConfigurator() internal view returns (ILendPoolConfigurator) {
    return ILendPoolConfigurator(_addressProvider.getLendPoolConfigurator());
  }
  /**
   * @dev Transfers the bTokens between two users. Validates the transfer
   * (ie checks for valid HF after the transfer) if required
   * @param from The source address
   * @param to The destination address
   * @param amount The amount getting transferred
   * @param validate `true` if the transfer needs to be validated
   **/
  function _transfer(
    address from,
    address to,
    uint256 amount,
    bool validate
  ) internal {
    address underlyingAsset = _underlyingAsset;
    ILendPool pool = _getLendPool();
    uint256 index = pool.getReserveNormalizedIncome(underlyingAsset);
    uint256 fromBalanceBefore = super.balanceOf(from).rayMul(index);
    uint256 toBalanceBefore = super.balanceOf(to).rayMul(index);
    super._transfer(from, to, amount.rayDiv(index));
    if (validate) {
      pool.finalizeTransfer(underlyingAsset, from, to, amount, fromBalanceBefore, toBalanceBefore);
    }
    emit BalanceTransfer(from, to, amount, index);
  }
  /**
   * @dev Overrides the parent _transfer to force validated transfer() and transferFrom()
   * @param from The source address
   * @param to The destination address
   * @param amount The amount getting transferred
   **/
  function _transfer(
    address from,
    address to,
    uint256 amount
  ) internal override {
    _transfer(from, to, amount, true);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
import {Initializable} from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
/**
 * @title BendCollector
 * @notice Stores all the BEND kept for incentives, just giving approval to the different
 * systems that will pull BEND funds for their specific use case
 * @author Bend
 **/
contract BendCollector is Initializable, OwnableUpgradeable {
  using SafeERC20Upgradeable for IERC20Upgradeable;
  /**
   * @dev initializes the contract upon assignment to the BendUpgradeableProxy
   */
  function initialize() external initializer {
    __Ownable_init();
  }
  function approve(
    IERC20Upgradeable token,
    address recipient,
    uint256 amount
  ) external onlyOwner {
    token.safeApprove(recipient, amount);
  }
  function transfer(
    IERC20Upgradeable token,
    address recipient,
    uint256 amount
  ) external onlyOwner {
    token.safeTransfer(recipient, amount);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import {Initializable} from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import {IReserveOracleGetter} from "../interfaces/IReserveOracleGetter.sol";
import {BlockContext} from "../utils/BlockContext.sol";
contract ReserveOracle is IReserveOracleGetter, OwnableUpgradeable, BlockContext {
  uint256 private constant TOKEN_DIGIT = 10**18;
  event AggregatorAdded(address currencyKey, address aggregator);
  event AggregatorRemoved(address currencyKey, address aggregator);
  // key by currency symbol, eg USDT
  mapping(address => AggregatorV3Interface) public priceFeedMap;
  address[] public priceFeedKeys;
  address public weth;
  function initialize(address _weth) public initializer {
    __Ownable_init();
    weth = _weth;
  }
  function setAggregators(address[] calldata _priceFeedKeys, address[] calldata _aggregators) external onlyOwner {
    require(_priceFeedKeys.length == _aggregators.length, "ReserveOracle: INCONSISTENT_PARAMS_LENGTH");
    for (uint256 i = 0; i < _priceFeedKeys.length; i++) {
      _addAggregator(_priceFeedKeys[i], _aggregators[i]);
    }
  }
  function addAggregator(address _priceFeedKey, address _aggregator) external onlyOwner {
    _addAggregator(_priceFeedKey, _aggregator);
  }
  function _addAggregator(address _priceFeedKey, address _aggregator) internal {
    requireNonEmptyAddress(_priceFeedKey);
    requireNonEmptyAddress(_aggregator);
    if (address(priceFeedMap[_priceFeedKey]) == address(0)) {
      priceFeedKeys.push(_priceFeedKey);
    }
    priceFeedMap[_priceFeedKey] = AggregatorV3Interface(_aggregator);
    emit AggregatorAdded(_priceFeedKey, address(_aggregator));
  }
  function removeAggregator(address _priceFeedKey) external onlyOwner {
    address aggregator = address(priceFeedMap[_priceFeedKey]);
    requireNonEmptyAddress(aggregator);
    delete priceFeedMap[_priceFeedKey];
    uint256 length = priceFeedKeys.length;
    for (uint256 i = 0; i < length; i++) {
      if (priceFeedKeys[i] == _priceFeedKey) {
        // if the removal item is the last one, just `pop`
        if (i != length - 1) {
          priceFeedKeys[i] = priceFeedKeys[length - 1];
        }
        priceFeedKeys.pop();
        emit AggregatorRemoved(_priceFeedKey, aggregator);
        break;
      }
    }
  }
  function getAggregator(address _priceFeedKey) public view returns (AggregatorV3Interface) {
    return priceFeedMap[_priceFeedKey];
  }
  function getAssetPrice(address _priceFeedKey) external view override returns (uint256) {
    if (_priceFeedKey == weth) {
      return 1 ether;
    }
    require(isExistedKey(_priceFeedKey), "ReserveOracle: key not existed");
    AggregatorV3Interface aggregator = getAggregator(_priceFeedKey);
    (, int256 _price, , , ) = aggregator.latestRoundData();
    require(_price >= 0, "ReserveOracle: negative answer");
    uint8 decimals = aggregator.decimals();
    return formatDecimals(uint256(_price), decimals);
  }
  function getLatestTimestamp(address _priceFeedKey) public view returns (uint256) {
    AggregatorV3Interface aggregator = getAggregator(_priceFeedKey);
    requireNonEmptyAddress(address(aggregator));
    (, , , uint256 timestamp, ) = aggregator.latestRoundData();
    return timestamp;
  }
  function getTwapPrice(address _priceFeedKey, uint256 _interval) external view override returns (uint256) {
    require(isExistedKey(_priceFeedKey), "ReserveOracle: key not existed");
    require(_interval != 0, "ReserveOracle: interval can't be 0");
    AggregatorV3Interface aggregator = getAggregator(_priceFeedKey);
    (uint80 roundId, int256 _price, , uint256 timestamp, ) = aggregator.latestRoundData();
    require(_price >= 0, "ReserveOracle: negative answer");
    uint8 decimals = aggregator.decimals();
    uint256 latestPrice = formatDecimals(uint256(_price), decimals);
    require(roundId >= 0, "ReserveOracle: Not enough history");
    uint256 latestTimestamp = timestamp;
    uint256 baseTimestamp = _blockTimestamp() - _interval;
    // if latest updated timestamp is earlier than target timestamp, return the latest price.
    if (latestTimestamp < baseTimestamp || roundId == 0) {
      return latestPrice;
    }
    // rounds are like snapshots, latestRound means the latest price snapshot. follow chainlink naming
    uint256 cumulativeTime = _blockTimestamp() - latestTimestamp;
    uint256 previousTimestamp = latestTimestamp;
    uint256 weightedPrice = latestPrice * cumulativeTime;
    while (true) {
      if (roundId == 0) {
        // if cumulative time is less than requested interval, return current twap price
        return weightedPrice / cumulativeTime;
      }
      roundId = roundId - 1;
      // get current round timestamp and price
      (, int256 _priceTemp, , uint256 currentTimestamp, ) = aggregator.getRoundData(roundId);
      require(_priceTemp >= 0, "ReserveOracle: negative answer");
      uint256 price = formatDecimals(uint256(_priceTemp), decimals);
      // check if current round timestamp is earlier than target timestamp
      if (currentTimestamp <= baseTimestamp) {
        // weighted time period will be (target timestamp - previous timestamp). For example,
        // now is 1000, _interval is 100, then target timestamp is 900. If timestamp of current round is 970,
        // and timestamp of NEXT round is 880, then the weighted time period will be (970 - 900) = 70,
        // instead of (970 - 880)
        weightedPrice = weightedPrice + (price * (previousTimestamp - baseTimestamp));
        break;
      }
      uint256 timeFraction = previousTimestamp - currentTimestamp;
      weightedPrice = weightedPrice + (price * timeFraction);
      cumulativeTime = cumulativeTime + timeFraction;
      previousTimestamp = currentTimestamp;
    }
    return weightedPrice / _interval;
  }
  function isExistedKey(address _priceFeedKey) private view returns (bool) {
    uint256 length = priceFeedKeys.length;
    for (uint256 i = 0; i < length; i++) {
      if (priceFeedKeys[i] == _priceFeedKey) {
        return true;
      }
    }
    return false;
  }
  function requireNonEmptyAddress(address _addr) internal pure {
    require(_addr != address(0), "ReserveOracle: empty address");
  }
  function formatDecimals(uint256 _price, uint8 _decimals) internal pure returns (uint256) {
    return (_price * TOKEN_DIGIT) / (10**uint256(_decimals));
  }
  function getPriceFeedLength() public view returns (uint256 length) {
    return priceFeedKeys.length;
  }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface AggregatorV3Interface {
  function decimals() external view returns (uint8);
  function description() external view returns (string memory);
  function version() external view returns (uint256);
  // getRoundData and latestRoundData should both raise "No data present"
  // if they do not have data to report, instead of returning unset values
  // which could be misinterpreted as actual reported values.
  function getRoundData(uint80 _roundId)
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
// wrap block.xxx functions for testing
// only support timestamp and number so far
abstract contract BlockContext {
  //◥◤◥◤◥◤◥◤◥◤◥◤◥◤◥◤ add state variables below ◥◤◥◤◥◤◥◤◥◤◥◤◥◤◥◤//
  //◢◣◢◣◢◣◢◣◢◣◢◣◢◣◢◣ add state variables above ◢◣◢◣◢◣◢◣◢◣◢◣◢◣◢◣//
  uint256[50] private __gap;
  function _blockTimestamp() internal view virtual returns (uint256) {
    return block.timestamp;
  }
  function _blockNumber() internal view virtual returns (uint256) {
    return block.number;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import {Initializable} from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import {INFTOracle} from "../interfaces/INFTOracle.sol";
import {BlockContext} from "../utils/BlockContext.sol";
contract NFTOracle is INFTOracle, Initializable, OwnableUpgradeable, BlockContext {
  modifier onlyAdmin() {
    require(_msgSender() == priceFeedAdmin, "NFTOracle: !admin");
    _;
  }
  event AssetAdded(address indexed asset);
  event AssetRemoved(address indexed asset);
  event FeedAdminUpdated(address indexed admin);
  event SetAssetData(address indexed asset, uint256 price, uint256 timestamp, uint256 roundId);
  struct NFTPriceData {
    uint256 roundId;
    uint256 price;
    uint256 timestamp;
  }
  struct NFTPriceFeed {
    bool registered;
    NFTPriceData[] nftPriceData;
  }
  address public priceFeedAdmin;
  // key is nft contract address
  mapping(address => NFTPriceFeed) public nftPriceFeedMap;
  address[] public nftPriceFeedKeys;
  // data validity check parameters
  uint256 private constant DECIMAL_PRECISION = 10**18;
  // Maximum deviation allowed between two consecutive oracle prices. 18-digit precision.
  uint256 public maxPriceDeviation; // 20%,18-digit precision.
  // The maximum allowed deviation between two consecutive oracle prices within a certain time frame. 18-bit precision.
  uint256 public maxPriceDeviationWithTime; // 10%
  uint256 public timeIntervalWithPrice; // 30 minutes
  uint256 public minimumUpdateTime; // 10 minutes
  mapping(address => bool) internal _nftPaused;
  modifier whenNotPaused(address _nftContract) {
    _whenNotPaused(_nftContract);
    _;
  }
  function _whenNotPaused(address _nftContract) internal view {
    bool _paused = _nftPaused[_nftContract];
    require(!_paused, "NFTOracle: nft price feed paused");
  }
  function initialize(
    address _admin,
    uint256 _maxPriceDeviation,
    uint256 _maxPriceDeviationWithTime,
    uint256 _timeIntervalWithPrice,
    uint256 _minimumUpdateTime
  ) public initializer {
    __Ownable_init();
    priceFeedAdmin = _admin;
    maxPriceDeviation = _maxPriceDeviation;
    maxPriceDeviationWithTime = _maxPriceDeviationWithTime;
    timeIntervalWithPrice = _timeIntervalWithPrice;
    minimumUpdateTime = _minimumUpdateTime;
  }
  function setPriceFeedAdmin(address _admin) external onlyOwner {
    priceFeedAdmin = _admin;
    emit FeedAdminUpdated(_admin);
  }
  function setAssets(address[] calldata _nftContracts) external onlyOwner {
    for (uint256 i = 0; i < _nftContracts.length; i++) {
      _addAsset(_nftContracts[i]);
    }
  }
  function addAsset(address _nftContract) external onlyOwner {
    _addAsset(_nftContract);
  }
  function _addAsset(address _nftContract) internal {
    requireKeyExisted(_nftContract, false);
    nftPriceFeedMap[_nftContract].registered = true;
    nftPriceFeedKeys.push(_nftContract);
    emit AssetAdded(_nftContract);
  }
  function removeAsset(address _nftContract) external onlyOwner {
    requireKeyExisted(_nftContract, true);
    delete nftPriceFeedMap[_nftContract];
    uint256 length = nftPriceFeedKeys.length;
    for (uint256 i = 0; i < length; i++) {
      if (nftPriceFeedKeys[i] == _nftContract) {
        nftPriceFeedKeys[i] = nftPriceFeedKeys[length - 1];
        nftPriceFeedKeys.pop();
        break;
      }
    }
    emit AssetRemoved(_nftContract);
  }
  function setAssetData(
    address _nftContract,
    uint256 _price,
    uint256, /*_timestamp*/
    uint256 _roundId
  ) external override onlyAdmin whenNotPaused(_nftContract) {
    requireKeyExisted(_nftContract, true);
    uint256 _timestamp = _blockTimestamp();
    require(_timestamp > getLatestTimestamp(_nftContract), "NFTOracle: incorrect timestamp");
    require(_price > 0, "NFTOracle: price can not be 0");
    bool dataValidity = checkValidityOfPrice(_nftContract, _price, _timestamp);
    require(dataValidity, "NFTOracle: invalid price data");
    NFTPriceData memory data = NFTPriceData({price: _price, timestamp: _timestamp, roundId: _roundId});
    nftPriceFeedMap[_nftContract].nftPriceData.push(data);
    emit SetAssetData(_nftContract, _price, _timestamp, _roundId);
  }
  function getAssetPrice(address _nftContract) external view override returns (uint256) {
    require(isExistedKey(_nftContract), "NFTOracle: key not existed");
    uint256 len = getPriceFeedLength(_nftContract);
    require(len > 0, "NFTOracle: no price data");
    return nftPriceFeedMap[_nftContract].nftPriceData[len - 1].price;
  }
  function getLatestTimestamp(address _nftContract) public view override returns (uint256) {
    require(isExistedKey(_nftContract), "NFTOracle: key not existed");
    uint256 len = getPriceFeedLength(_nftContract);
    if (len == 0) {
      return 0;
    }
    return nftPriceFeedMap[_nftContract].nftPriceData[len - 1].timestamp;
  }
  function getTwapPrice(address _nftContract, uint256 _interval) external view override returns (uint256) {
    require(isExistedKey(_nftContract), "NFTOracle: key not existed");
    require(_interval != 0, "NFTOracle: interval can't be 0");
    uint256 len = getPriceFeedLength(_nftContract);
    require(len > 0, "NFTOracle: Not enough history");
    uint256 round = len - 1;
    NFTPriceData memory priceRecord = nftPriceFeedMap[_nftContract].nftPriceData[round];
    uint256 latestTimestamp = priceRecord.timestamp;
    uint256 baseTimestamp = _blockTimestamp() - _interval;
    // if latest updated timestamp is earlier than target timestamp, return the latest price.
    if (latestTimestamp < baseTimestamp || round == 0) {
      return priceRecord.price;
    }
    // rounds are like snapshots, latestRound means the latest price snapshot. follow chainlink naming
    uint256 cumulativeTime = _blockTimestamp() - latestTimestamp;
    uint256 previousTimestamp = latestTimestamp;
    uint256 weightedPrice = priceRecord.price * cumulativeTime;
    while (true) {
      if (round == 0) {
        // if cumulative time is less than requested interval, return current twap price
        return weightedPrice / cumulativeTime;
      }
      round = round - 1;
      // get current round timestamp and price
      priceRecord = nftPriceFeedMap[_nftContract].nftPriceData[round];
      uint256 currentTimestamp = priceRecord.timestamp;
      uint256 price = priceRecord.price;
      // check if current round timestamp is earlier than target timestamp
      if (currentTimestamp <= baseTimestamp) {
        // weighted time period will be (target timestamp - previous timestamp). For example,
        // now is 1000, _interval is 100, then target timestamp is 900. If timestamp of current round is 970,
        // and timestamp of NEXT round is 880, then the weighted time period will be (970 - 900) = 70,
        // instead of (970 - 880)
        weightedPrice = weightedPrice + (price * (previousTimestamp - baseTimestamp));
        break;
      }
      uint256 timeFraction = previousTimestamp - currentTimestamp;
      weightedPrice = weightedPrice + price * timeFraction;
      cumulativeTime = cumulativeTime + timeFraction;
      previousTimestamp = currentTimestamp;
    }
    return weightedPrice / _interval;
  }
  function getPreviousPrice(address _nftContract, uint256 _numOfRoundBack) public view override returns (uint256) {
    require(isExistedKey(_nftContract), "NFTOracle: key not existed");
    uint256 len = getPriceFeedLength(_nftContract);
    require(len > 0 && _numOfRoundBack < len, "NFTOracle: Not enough history");
    return nftPriceFeedMap[_nftContract].nftPriceData[len - _numOfRoundBack - 1].price;
  }
  function getPreviousTimestamp(address _nftContract, uint256 _numOfRoundBack) public view override returns (uint256) {
    require(isExistedKey(_nftContract), "NFTOracle: key not existed");
    uint256 len = getPriceFeedLength(_nftContract);
    require(len > 0 && _numOfRoundBack < len, "NFTOracle: Not enough history");
    return nftPriceFeedMap[_nftContract].nftPriceData[len - _numOfRoundBack - 1].timestamp;
  }
  function getPriceFeedLength(address _nftContract) public view returns (uint256 length) {
    return nftPriceFeedMap[_nftContract].nftPriceData.length;
  }
  function getLatestRoundId(address _nftContract) public view returns (uint256) {
    uint256 len = getPriceFeedLength(_nftContract);
    if (len == 0) {
      return 0;
    }
    return nftPriceFeedMap[_nftContract].nftPriceData[len - 1].roundId;
  }
  function isExistedKey(address _nftContract) private view returns (bool) {
    return nftPriceFeedMap[_nftContract].registered;
  }
  function requireKeyExisted(address _key, bool _existed) private view {
    if (_existed) {
      require(isExistedKey(_key), "NFTOracle: key not existed");
    } else {
      require(!isExistedKey(_key), "NFTOracle: key existed");
    }
  }
  function checkValidityOfPrice(
    address _nftContract,
    uint256 _price,
    uint256 _timestamp
  ) private view returns (bool) {
    uint256 len = getPriceFeedLength(_nftContract);
    if (len > 0) {
      uint256 price = nftPriceFeedMap[_nftContract].nftPriceData[len - 1].price;
      if (_price == price) {
        return true;
      }
      uint256 timestamp = nftPriceFeedMap[_nftContract].nftPriceData[len - 1].timestamp;
      uint256 percentDeviation;
      if (_price > price) {
        percentDeviation = ((_price - price) * DECIMAL_PRECISION) / price;
      } else {
        percentDeviation = ((price - _price) * DECIMAL_PRECISION) / price;
      }
      uint256 timeDeviation = _timestamp - timestamp;
      if (percentDeviation > maxPriceDeviation) {
        return false;
      } else if (timeDeviation < minimumUpdateTime) {
        return false;
      } else if ((percentDeviation > maxPriceDeviationWithTime) && (timeDeviation < timeIntervalWithPrice)) {
        return false;
      }
    }
    return true;
  }
  function setDataValidityParameters(
    uint256 _maxPriceDeviation,
    uint256 _maxPriceDeviationWithTime,
    uint256 _timeIntervalWithPrice,
    uint256 _minimumUpdateTime
  ) external onlyOwner {
    maxPriceDeviation = _maxPriceDeviation;
    maxPriceDeviationWithTime = _maxPriceDeviationWithTime;
    timeIntervalWithPrice = _timeIntervalWithPrice;
    minimumUpdateTime = _minimumUpdateTime;
  }
  function setPause(address _nftContract, bool val) external override onlyOwner {
    _nftPaused[_nftContract] = val;
  }
  function paused(address _nftContract) external view override returns (bool) {
    return _nftPaused[_nftContract];
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/************
@title INFTOracle interface
@notice Interface for NFT price oracle.*/
interface INFTOracle {
  /* CAUTION: Price uint is ETH based (WEI, 18 decimals) */
  // get latest price
  function getAssetPrice(address _asset) external view returns (uint256);
  // get latest timestamp
  function getLatestTimestamp(address _asset) external view returns (uint256);
  // get previous price with _back rounds
  function getPreviousPrice(address _asset, uint256 _numOfRoundBack) external view returns (uint256);
  // get previous timestamp with _back rounds
  function getPreviousTimestamp(address _asset, uint256 _numOfRoundBack) external view returns (uint256);
  // get twap price depending on _period
  function getTwapPrice(address _asset, uint256 _interval) external view returns (uint256);
  function setAssetData(
    address _asset,
    uint256 _price,
    uint256 _timestamp,
    uint256 _roundId
  ) external;
  function setPause(address _nftContract, bool val) external;
  function paused(address _nftContract) external view returns (bool);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {NFTOracle} from "../protocol/NFTOracle.sol";
contract MockNFTOracle is NFTOracle {
  uint256 private timestamp = 1444004400;
  uint256 private number = 10001;
  function mock_setBlockTimestamp(uint256 _timestamp) public {
    timestamp = _timestamp;
  }
  function mock_setBlockNumber(uint256 _number) public {
    number = _number;
  }
  function mock_getCurrentTimestamp() public view returns (uint256) {
    return _blockTimestamp();
  }
  // Override BlockContext here
  function _blockTimestamp() internal view override returns (uint256) {
    return timestamp;
  }
  function _blockNumber() internal view override returns (uint256) {
    return number;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IERC20Detailed} from "../interfaces/IERC20Detailed.sol";
import {IERC721Detailed} from "../interfaces/IERC721Detailed.sol";
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
import {ILendPool} from "../interfaces/ILendPool.sol";
import {ILendPoolLoan} from "../interfaces/ILendPoolLoan.sol";
import {IDebtToken} from "../interfaces/IDebtToken.sol";
import {ReserveConfiguration} from "../libraries/configuration/ReserveConfiguration.sol";
import {NftConfiguration} from "../libraries/configuration/NftConfiguration.sol";
import {DataTypes} from "../libraries/types/DataTypes.sol";
contract BendProtocolDataProvider {
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  using NftConfiguration for DataTypes.NftConfigurationMap;
  address constant ETH = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
  struct ReserveTokenData {
    string tokenSymbol;
    address tokenAddress;
    string bTokenSymbol;
    address bTokenAddress;
    string debtTokenSymbol;
    address debtTokenAddress;
  }
  struct NftTokenData {
    string nftSymbol;
    address nftAddress;
    string bNftSymbol;
    address bNftAddress;
  }
  ILendPoolAddressesProvider public immutable ADDRESSES_PROVIDER;
  constructor(ILendPoolAddressesProvider addressesProvider) {
    ADDRESSES_PROVIDER = addressesProvider;
  }
  function getAllReservesTokenDatas() external view returns (ReserveTokenData[] memory) {
    ILendPool pool = ILendPool(ADDRESSES_PROVIDER.getLendPool());
    address[] memory reserves = pool.getReservesList();
    ReserveTokenData[] memory reservesTokens = new ReserveTokenData[](reserves.length);
    for (uint256 i = 0; i < reserves.length; i++) {
      DataTypes.ReserveData memory reserveData = pool.getReserveData(reserves[i]);
      reservesTokens[i] = ReserveTokenData({
        tokenSymbol: IERC20Detailed(reserves[i]).symbol(),
        tokenAddress: reserves[i],
        bTokenSymbol: IERC20Detailed(reserveData.bTokenAddress).symbol(),
        bTokenAddress: reserveData.bTokenAddress,
        debtTokenSymbol: IERC20Detailed(reserveData.debtTokenAddress).symbol(),
        debtTokenAddress: reserveData.debtTokenAddress
      });
    }
    return reservesTokens;
  }
  function getReserveTokenData(address asset) external view returns (ReserveTokenData memory) {
    ILendPool pool = ILendPool(ADDRESSES_PROVIDER.getLendPool());
    DataTypes.ReserveData memory reserveData = pool.getReserveData(asset);
    return
      ReserveTokenData({
        tokenSymbol: IERC20Detailed(asset).symbol(),
        tokenAddress: asset,
        bTokenSymbol: IERC20Detailed(reserveData.bTokenAddress).symbol(),
        bTokenAddress: reserveData.bTokenAddress,
        debtTokenSymbol: IERC20Detailed(reserveData.debtTokenAddress).symbol(),
        debtTokenAddress: reserveData.debtTokenAddress
      });
  }
  function getAllNftsTokenDatas() external view returns (NftTokenData[] memory) {
    ILendPool pool = ILendPool(ADDRESSES_PROVIDER.getLendPool());
    address[] memory nfts = pool.getNftsList();
    NftTokenData[] memory nftTokens = new NftTokenData[](nfts.length);
    for (uint256 i = 0; i < nfts.length; i++) {
      DataTypes.NftData memory nftData = pool.getNftData(nfts[i]);
      nftTokens[i] = NftTokenData({
        nftSymbol: IERC721Detailed(nfts[i]).symbol(),
        nftAddress: nfts[i],
        bNftSymbol: IERC721Detailed(nftData.bNftAddress).symbol(),
        bNftAddress: nftData.bNftAddress
      });
    }
    return nftTokens;
  }
  function getNftTokenData(address nftAsset) external view returns (NftTokenData memory) {
    ILendPool pool = ILendPool(ADDRESSES_PROVIDER.getLendPool());
    DataTypes.NftData memory nftData = pool.getNftData(nftAsset);
    return
      NftTokenData({
        nftSymbol: IERC20Detailed(nftAsset).symbol(),
        nftAddress: nftAsset,
        bNftSymbol: IERC20Detailed(nftData.bNftAddress).symbol(),
        bNftAddress: nftData.bNftAddress
      });
  }
  function getReserveConfigurationData(address asset)
    external
    view
    returns (
      uint256 decimals,
      uint256 reserveFactor,
      bool borrowingEnabled,
      bool isActive,
      bool isFrozen
    )
  {
    DataTypes.ReserveConfigurationMap memory configuration = ILendPool(ADDRESSES_PROVIDER.getLendPool())
      .getReserveConfiguration(asset);
    (, , , decimals, reserveFactor) = configuration.getParamsMemory();
    (isActive, isFrozen, borrowingEnabled, ) = configuration.getFlagsMemory();
  }
  function getNftConfigurationData(address asset)
    external
    view
    returns (
      uint256 ltv,
      uint256 liquidationThreshold,
      uint256 liquidationBonus,
      uint256 redeemDuration,
      uint256 auctionDuration,
      uint256 redeemFine,
      uint256 redeemThreshold,
      bool isActive,
      bool isFrozen
    )
  {
    DataTypes.NftConfigurationMap memory configuration = ILendPool(ADDRESSES_PROVIDER.getLendPool())
      .getNftConfiguration(asset);
    (ltv, liquidationThreshold, liquidationBonus) = configuration.getCollateralParamsMemory();
    (redeemDuration, auctionDuration, redeemFine, redeemThreshold) = configuration.getAuctionParamsMemory();
    (isActive, isFrozen) = configuration.getFlagsMemory();
  }
  function getReserveData(address asset)
    external
    view
    returns (
      uint256 availableLiquidity,
      uint256 totalVariableDebt,
      uint256 liquidityRate,
      uint256 variableBorrowRate,
      uint256 liquidityIndex,
      uint256 variableBorrowIndex,
      uint40 lastUpdateTimestamp
    )
  {
    DataTypes.ReserveData memory reserve = ILendPool(ADDRESSES_PROVIDER.getLendPool()).getReserveData(asset);
    return (
      IERC20Detailed(asset).balanceOf(reserve.bTokenAddress),
      IERC20Detailed(reserve.debtTokenAddress).totalSupply(),
      reserve.currentLiquidityRate,
      reserve.currentVariableBorrowRate,
      reserve.liquidityIndex,
      reserve.variableBorrowIndex,
      reserve.lastUpdateTimestamp
    );
  }
  function getUserReserveData(address asset, address user)
    external
    view
    returns (
      uint256 currentBTokenBalance,
      uint256 currentVariableDebt,
      uint256 scaledVariableDebt,
      uint256 liquidityRate
    )
  {
    DataTypes.ReserveData memory reserve = ILendPool(ADDRESSES_PROVIDER.getLendPool()).getReserveData(asset);
    currentBTokenBalance = IERC20Detailed(reserve.bTokenAddress).balanceOf(user);
    currentVariableDebt = IERC20Detailed(reserve.debtTokenAddress).balanceOf(user);
    scaledVariableDebt = IDebtToken(reserve.debtTokenAddress).scaledBalanceOf(user);
    liquidityRate = reserve.currentLiquidityRate;
  }
  struct LoanData {
    uint256 loanId;
    uint8 state;
    address borrower;
    address nftAsset;
    uint256 nftTokenId;
    address reserveAsset;
    uint256 scaledAmount;
    uint256 currentAmount;
    uint256 bidStartTimestamp;
    address bidderAddress;
    uint256 bidPrice;
    uint256 bidBorrowAmount;
  }
  function getLoanDataByCollateral(address nftAsset, uint256 nftTokenId)
    external
    view
    returns (LoanData memory loanData)
  {
    loanData.loanId = ILendPoolLoan(ADDRESSES_PROVIDER.getLendPoolLoan()).getCollateralLoanId(nftAsset, nftTokenId);
    DataTypes.LoanData memory loan = ILendPoolLoan(ADDRESSES_PROVIDER.getLendPoolLoan()).getLoan(loanData.loanId);
    _fillLoanData(loanData, loan);
  }
  function getLoanDataByLoanId(uint256 loanId) external view returns (LoanData memory loanData) {
    DataTypes.LoanData memory loan = ILendPoolLoan(ADDRESSES_PROVIDER.getLendPoolLoan()).getLoan(loanId);
    _fillLoanData(loanData, loan);
  }
  function _fillLoanData(LoanData memory loanData, DataTypes.LoanData memory loan) internal view {
    loanData.loanId = loan.loanId;
    loanData.state = uint8(loan.state);
    loanData.borrower = loan.borrower;
    loanData.nftAsset = loan.nftAsset;
    loanData.nftTokenId = loan.nftTokenId;
    loanData.reserveAsset = loan.reserveAsset;
    loanData.scaledAmount = loan.scaledAmount;
    (, loanData.currentAmount) = ILendPoolLoan(ADDRESSES_PROVIDER.getLendPoolLoan()).getLoanReserveBorrowAmount(
      loan.loanId
    );
    loanData.bidStartTimestamp = loan.bidStartTimestamp;
    loanData.bidderAddress = loan.bidderAddress;
    loanData.bidPrice = loan.bidPrice;
    loanData.bidBorrowAmount = loan.bidBorrowAmount;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IIncentivesController} from "../interfaces/IIncentivesController.sol";
contract MockIncentivesController is IIncentivesController {
  bool private _handleActionIsCalled;
  address private _asset;
  uint256 private _totalSupply;
  uint256 private _userBalance;
  /**
   * @dev Called by the corresponding asset on any update that affects the rewards distribution
   * @param asset The address of the user
   * @param totalSupply The total supply of the asset in the lending pool
   * @param userBalance The balance of the user of the asset in the lending pool
   **/
  function handleAction(
    address asset,
    uint256 totalSupply,
    uint256 userBalance
  ) external override {
    _handleActionIsCalled = true;
    _asset = asset;
    _totalSupply = totalSupply;
    _userBalance = userBalance;
  }
  function checkHandleActionIsCorrect(
    address asset,
    uint256 totalSupply,
    uint256 userBalance
  ) public view returns (bool) {
    return _handleActionIsCalled && asset == _asset && totalSupply == _totalSupply && userBalance == _userBalance;
  }
  function checkHandleActionIsCalled() public view returns (bool) {
    return _handleActionIsCalled;
  }
  function resetHandleActionIsCalled() public {
    _handleActionIsCalled = false;
    _asset = address(0);
    _totalSupply = 0;
    _userBalance = 0;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IERC721Receiver} from "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
import {ILendPool} from "../interfaces/ILendPool.sol";
import {IDebtToken} from "../interfaces/IDebtToken.sol";
import {DataTypes} from "../libraries/types/DataTypes.sol";
/**
 * @title MaliciousHackerERC721
 * @dev Malicious Hacker Logic
 */
contract MaliciousHackerERC721 is IERC721Receiver {
  ILendPool internal _pool;
  uint256 internal _simulateAction;
  uint256 public constant ACTION_DEPOSIT = 1;
  uint256 public constant ACTION_WITHDRAW = 2;
  uint256 public constant ACTION_BORROW = 3;
  uint256 public constant ACTION_REPAY = 4;
  uint256 public constant ACTION_AUCTION = 5;
  uint256 public constant ACTION_REDEEM = 6;
  uint256 public constant ACTION_LIQUIDATE = 7;
  constructor(address pool_) {
    _pool = ILendPool(pool_);
  }
  function approveDelegate(address reserve, address delegatee) public {
    DataTypes.ReserveData memory reserveData = _pool.getReserveData(reserve);
    IDebtToken debtToken = IDebtToken(reserveData.debtTokenAddress);
    debtToken.approveDelegation(delegatee, type(uint256).max);
  }
  function simulateAction(uint256 simulateAction_) public {
    _simulateAction = simulateAction_;
  }
  struct OnERC721ReceivedLocalVars {
    address[] reserves;
    address[] nfts;
    address onBehalfOf;
    address to;
    uint16 referralCode;
    uint256 amount;
    uint256 bidPrice;
    uint256 bidFine;
  }
  function onERC721Received(
    address operator,
    address from,
    uint256 tokenId,
    bytes calldata data
  ) external override returns (bytes4) {
    operator;
    from;
    tokenId;
    data;
    OnERC721ReceivedLocalVars memory vars;
    vars.reserves = _pool.getReservesList();
    vars.nfts = _pool.getNftsList();
    vars.onBehalfOf = msg.sender;
    vars.to = msg.sender;
    vars.referralCode = 0;
    vars.amount = 1 ether;
    vars.bidPrice = 2 ether;
    vars.bidFine = 0.1 ether;
    if (_simulateAction == ACTION_DEPOSIT) {
      _pool.deposit(vars.reserves[0], vars.amount, vars.onBehalfOf, vars.referralCode);
    } else if (_simulateAction == ACTION_WITHDRAW) {
      _pool.withdraw(vars.reserves[0], vars.amount, vars.to);
    } else if (_simulateAction == ACTION_BORROW) {
      _pool.borrow(vars.reserves[0], vars.amount, vars.nfts[0], tokenId, vars.onBehalfOf, vars.referralCode);
    } else if (_simulateAction == ACTION_REPAY) {
      _pool.repay(vars.nfts[0], tokenId, vars.amount);
    } else if (_simulateAction == ACTION_AUCTION) {
      _pool.auction(vars.nfts[0], tokenId, vars.bidPrice, vars.onBehalfOf);
    } else if (_simulateAction == ACTION_REDEEM) {
      _pool.redeem(vars.nfts[0], tokenId, vars.amount, vars.bidFine);
    } else if (_simulateAction == ACTION_LIQUIDATE) {
      _pool.liquidate(vars.nfts[0], tokenId, vars.amount);
    }
    return IERC721Receiver.onERC721Received.selector;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IBNFT} from "../../interfaces/IBNFT.sol";
import {IFlashLoanReceiver} from "../../interfaces/IFlashLoanReceiver.sol";
import {AddressUpgradeable} from "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol";
import {ERC721Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/ERC721Upgradeable.sol";
import {ERC721EnumerableUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/extensions/ERC721EnumerableUpgradeable.sol";
import {IERC721Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
import {IERC721MetadataUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/extensions/IERC721MetadataUpgradeable.sol";
import {IERC721ReceiverUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721ReceiverUpgradeable.sol";
/**
 * @title BNFT contract
 * @dev Implements the methods for the bNFT protocol
 **/
contract BNFT is ERC721EnumerableUpgradeable, IBNFT {
  address private _underlyingAsset;
  // Mapping from token ID to minter address
  mapping(uint256 => address) private _minters;
  /**
   * @dev Initializes the bNFT
   * @param underlyingAsset The address of the underlying asset of this bNFT (E.g. PUNK for bPUNK)
   */
  function initialize(
    address underlyingAsset,
    string calldata bNftName,
    string calldata bNftSymbol
  ) external override initializer {
    __ERC721_init(bNftName, bNftSymbol);
    _underlyingAsset = underlyingAsset;
    emit Initialized(underlyingAsset);
  }
  /**
   * @dev Mints bNFT token to the user address
   *
   * Requirements:
   *  - The caller must be contract address
   *
   * @param to The owner address receive the bNFT token
   * @param tokenId token id of the underlying asset of NFT
   **/
  function mint(address to, uint256 tokenId) external override {
    require(AddressUpgradeable.isContract(_msgSender()), "BNFT: caller is not contract");
    require(!_exists(tokenId), "BNFT: exist token");
    require(IERC721Upgradeable(_underlyingAsset).ownerOf(tokenId) == _msgSender(), "BNFT: caller is not owner");
    // Receive NFT Tokens
    IERC721Upgradeable(_underlyingAsset).safeTransferFrom(_msgSender(), address(this), tokenId);
    // mint bNFT to user
    _mint(to, tokenId);
    _minters[tokenId] = _msgSender();
    emit Mint(_msgSender(), _underlyingAsset, tokenId, to);
  }
  /**
   * @dev Burns user bNFT token
   *
   * Requirements:
   *  - The caller must be contract address
   *
   * @param tokenId token id of the underlying asset of NFT
   **/
  function burn(uint256 tokenId) external override {
    require(AddressUpgradeable.isContract(_msgSender()), "BNFT: caller is not contract");
    require(_exists(tokenId), "BNFT: nonexist token");
    require(_minters[tokenId] == _msgSender(), "BNFT: caller is not minter");
    address owner = ERC721Upgradeable.ownerOf(tokenId);
    IERC721Upgradeable(_underlyingAsset).safeTransferFrom(address(this), _msgSender(), tokenId);
    _burn(tokenId);
    delete _minters[tokenId];
    emit Burn(_msgSender(), _underlyingAsset, tokenId, owner);
  }
  /**
   * @dev See {IBNFT-flashLoan}.
   */
  function flashLoan(
    address receiverAddress,
    uint256[] calldata nftTokenIds,
    bytes calldata params
  ) external override {
    uint256 i;
    IFlashLoanReceiver receiver = IFlashLoanReceiver(receiverAddress);
    // !!!CAUTION: receiver contract may reentry mint, burn, flashloan again
    // only token owner can do flashloan
    for (i = 0; i < nftTokenIds.length; i++) {
      require(ownerOf(nftTokenIds[i]) == _msgSender(), "BNFT: caller is not owner");
    }
    // step 1: moving underlying asset forward to receiver contract
    for (i = 0; i < nftTokenIds.length; i++) {
      IERC721Upgradeable(_underlyingAsset).safeTransferFrom(address(this), receiverAddress, nftTokenIds[i]);
    }
    // setup 2: execute receiver contract, doing something like aidrop
    require(
      receiver.executeOperation(_underlyingAsset, nftTokenIds, _msgSender(), address(this), params),
      "BNFT: invalid flashloan executor return"
    );
    // setup 3: moving underlying asset backword from receiver contract
    for (i = 0; i < nftTokenIds.length; i++) {
      IERC721Upgradeable(_underlyingAsset).safeTransferFrom(receiverAddress, address(this), nftTokenIds[i]);
      emit FlashLoan(receiverAddress, _msgSender(), _underlyingAsset, nftTokenIds[i]);
    }
  }
  /**
   * @dev See {IERC721Metadata-tokenURI}.
   */
  function tokenURI(uint256 tokenId)
    public
    view
    virtual
    override(ERC721Upgradeable, IERC721MetadataUpgradeable)
    returns (string memory)
  {
    return IERC721MetadataUpgradeable(_underlyingAsset).tokenURI(tokenId);
  }
  function onERC721Received(
    address operator,
    address from,
    uint256 tokenId,
    bytes calldata data
  ) external pure override returns (bytes4) {
    operator;
    from;
    tokenId;
    data;
    return IERC721ReceiverUpgradeable.onERC721Received.selector;
  }
  /**
   * @dev See {IBNFT-minterOf}.
   */
  function minterOf(uint256 tokenId) external view override returns (address) {
    address minter = _minters[tokenId];
    require(minter != address(0), "BNFT: minter query for nonexistent token");
    return minter;
  }
  /**
   * @dev Being non transferrable, the bNFT token does not implement any of the
   * standard ERC721 functions for transfer and allowance.
   **/
  function approve(address to, uint256 tokenId) public virtual override(ERC721Upgradeable, IERC721Upgradeable) {
    to;
    tokenId;
    revert("APPROVAL_NOT_SUPPORTED");
  }
  function setApprovalForAll(address operator, bool approved)
    public
    virtual
    override(ERC721Upgradeable, IERC721Upgradeable)
  {
    operator;
    approved;
    revert("APPROVAL_NOT_SUPPORTED");
  }
  function transferFrom(
    address from,
    address to,
    uint256 tokenId
  ) public virtual override(ERC721Upgradeable, IERC721Upgradeable) {
    from;
    to;
    tokenId;
    revert("TRANSFER_NOT_SUPPORTED");
  }
  function safeTransferFrom(
    address from,
    address to,
    uint256 tokenId
  ) public virtual override(ERC721Upgradeable, IERC721Upgradeable) {
    from;
    to;
    tokenId;
    revert("TRANSFER_NOT_SUPPORTED");
  }
  function safeTransferFrom(
    address from,
    address to,
    uint256 tokenId,
    bytes memory _data
  ) public virtual override(ERC721Upgradeable, IERC721Upgradeable) {
    from;
    to;
    tokenId;
    _data;
    revert("TRANSFER_NOT_SUPPORTED");
  }
  function _transfer(
    address from,
    address to,
    uint256 tokenId
  ) internal virtual override(ERC721Upgradeable) {
    from;
    to;
    tokenId;
    revert("TRANSFER_NOT_SUPPORTED");
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title IFlashLoanReceiver interface
 * @notice Interface for the IFlashLoanReceiver.
 * @author BEND
 * @dev implement this interface to develop a flashloan-compatible flashLoanReceiver contract
 **/
interface IFlashLoanReceiver {
  function executeOperation(
    address asset,
    uint256[] calldata tokenIds,
    address initiator,
    address operator,
    bytes calldata params
  ) external returns (bool);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./AggregatorInterface.sol";
import "./AggregatorV3Interface.sol";
interface AggregatorV2V3Interface is AggregatorInterface, AggregatorV3Interface {}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface AggregatorInterface {
  function latestAnswer() external view returns (int256);
  function latestTimestamp() external view returns (uint256);
  function latestRound() external view returns (uint256);
  function getAnswer(uint256 roundId) external view returns (int256);
  function getTimestamp(uint256 roundId) external view returns (uint256);
  event AnswerUpdated(int256 indexed current, uint256 indexed roundId, uint256 updatedAt);
  event NewRound(uint256 indexed roundId, address indexed startedBy, uint256 startedAt);
}
// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.4;
import {AggregatorV2V3Interface} from "@chainlink/contracts/src/v0.8/interfaces/AggregatorV2V3Interface.sol";
// EACAggregatorProxy is (AggregatorProxy is AggregatorV2V3Interface)
contract MockChainlinkOracle is AggregatorV2V3Interface {
  uint80[] internal roundIdArray;
  int256[] internal answerArray;
  uint256[] internal decimalsArray;
  uint256[] internal timestampArray;
  uint80[] internal versionArray;
  uint8 internal _decimals;
  constructor(uint8 decimals_) {
    _decimals = decimals_;
  }
  // Proxy
  function aggregator() public view returns (address) {
    return address(this);
  }
  // V2
  function latestAnswer() external view override returns (int256) {
    uint256 index = roundIdArray.length - 1;
    return answerArray[index];
  }
  function latestTimestamp() external view override returns (uint256) {
    uint256 index = roundIdArray.length - 1;
    return timestampArray[index];
  }
  function latestRound() external view override returns (uint256) {
    uint256 index = roundIdArray.length - 1;
    return roundIdArray[index];
  }
  function getAnswer(uint256 roundId) external view override returns (int256) {
    uint256 maxIndex = roundIdArray.length - 1;
    uint256 index = maxIndex + roundId - roundIdArray[maxIndex];
    return answerArray[index];
  }
  function getTimestamp(uint256 roundId) external view override returns (uint256) {
    uint256 maxIndex = roundIdArray.length - 1;
    uint256 index = maxIndex + roundId - roundIdArray[maxIndex];
    return timestampArray[index];
  }
  // V3
  function decimals() external view override returns (uint8) {
    return _decimals;
  }
  function description() external pure override returns (string memory) {
    return "";
  }
  function version() external pure override returns (uint256) {
    return 0;
  }
  function getRoundData(uint80 _roundId)
    external
    view
    override
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    uint256 maxIndex = roundIdArray.length - 1;
    uint256 index = maxIndex + _roundId - roundIdArray[maxIndex];
    return (roundIdArray[index], answerArray[index], decimalsArray[index], timestampArray[index], versionArray[index]);
  }
  function latestRoundData()
    external
    view
    override
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    uint256 index = roundIdArray.length - 1;
    return (roundIdArray[index], answerArray[index], decimalsArray[index], timestampArray[index], versionArray[index]);
  }
  // mock
  function mockAddAnswer(
    uint80 _roundId,
    int256 _answer,
    uint256 _startedAt,
    uint256 _updatedAt,
    uint80 _answeredInRound
  ) external {
    roundIdArray.push(_roundId);
    answerArray.push(_answer);
    decimalsArray.push(_startedAt);
    timestampArray.push(_updatedAt);
    versionArray.push(_answeredInRound);
    emit AnswerUpdated(_answer, _roundId, _updatedAt);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
//import {IReserveOracle} from "../interfaces/IReserveOracle.sol";
import {ReserveOracle} from "../protocol/ReserveOracle.sol";
contract MockReserveOracle is ReserveOracle {
  uint256 private timestamp = 1444004400;
  uint256 private number = 10001;
  function mock_setBlockTimestamp(uint256 _timestamp) public {
    timestamp = _timestamp;
  }
  function mock_setBlockNumber(uint256 _number) public {
    number = _number;
  }
  function mock_getCurrentTimestamp() public view returns (uint256) {
    return _blockTimestamp();
  }
  // Override BlockContext here
  function _blockTimestamp() internal view override returns (uint256) {
    return timestamp;
  }
  function _blockNumber() internal view override returns (uint256) {
    return number;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import "../protocol/BToken.sol";
contract MockBTokenVersionN is BToken {
  uint256 public dummy1;
  uint256 public dummy2;
  function initializeVersionN(uint256 dummy1_, uint256 dummy2_) external initializer {
    dummy1 = dummy1_;
    dummy2 = dummy2_;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import "../protocol/DebtToken.sol";
contract MockDebtTokenVersionN is DebtToken {
  uint256 public dummy1;
  uint256 public dummy2;
  function initializeVersionN(uint256 dummy1_, uint256 dummy2_) external initializer {
    dummy1 = dummy1_;
    dummy2 = dummy2_;
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)
pragma solidity ^0.8.0;
import "../IERC20.sol";
/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);
    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);
    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/ERC20.sol)
pragma solidity ^0.8.0;
import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";
/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    uint256 private _totalSupply;
    string private _name;
    string private _symbol;
    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }
    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }
    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }
    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }
    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }
    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }
    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }
    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }
    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }
        return true;
    }
    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }
    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }
        return true;
    }
    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        _beforeTokenTransfer(sender, recipient, amount);
        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;
        emit Transfer(sender, recipient, amount);
        _afterTokenTransfer(sender, recipient, amount);
    }
    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");
        _beforeTokenTransfer(address(0), account, amount);
        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);
        _afterTokenTransfer(address(0), account, amount);
    }
    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");
        _beforeTokenTransfer(account, address(0), amount);
        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;
        emit Transfer(account, address(0), amount);
        _afterTokenTransfer(account, address(0), amount);
    }
    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/AccessControl.sol)
pragma solidity ^0.8.0;
import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";
/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }
    mapping(bytes32 => RoleData) private _roles;
    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;
    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role, _msgSender());
        _;
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }
    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view override returns (bool) {
        return _roles[role].members[account];
    }
    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(uint160(account), 20),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }
    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view override returns (bytes32) {
        return _roles[role].adminRole;
    }
    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }
    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }
    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");
        _revokeRole(role, account);
    }
    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }
    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }
    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }
    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)
pragma solidity ^0.8.0;
/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);
    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);
    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);
    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);
    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);
    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;
    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;
    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (governance/TimelockController.sol)
pragma solidity ^0.8.0;
import "../access/AccessControl.sol";
/**
 * @dev Contract module which acts as a timelocked controller. When set as the
 * owner of an `Ownable` smart contract, it enforces a timelock on all
 * `onlyOwner` maintenance operations. This gives time for users of the
 * controlled contract to exit before a potentially dangerous maintenance
 * operation is applied.
 *
 * By default, this contract is self administered, meaning administration tasks
 * have to go through the timelock process. The proposer (resp executor) role
 * is in charge of proposing (resp executing) operations. A common use case is
 * to position this {TimelockController} as the owner of a smart contract, with
 * a multisig or a DAO as the sole proposer.
 *
 * _Available since v3.3._
 */
contract TimelockController is AccessControl {
    bytes32 public constant TIMELOCK_ADMIN_ROLE = keccak256("TIMELOCK_ADMIN_ROLE");
    bytes32 public constant PROPOSER_ROLE = keccak256("PROPOSER_ROLE");
    bytes32 public constant EXECUTOR_ROLE = keccak256("EXECUTOR_ROLE");
    uint256 internal constant _DONE_TIMESTAMP = uint256(1);
    mapping(bytes32 => uint256) private _timestamps;
    uint256 private _minDelay;
    /**
     * @dev Emitted when a call is scheduled as part of operation `id`.
     */
    event CallScheduled(
        bytes32 indexed id,
        uint256 indexed index,
        address target,
        uint256 value,
        bytes data,
        bytes32 predecessor,
        uint256 delay
    );
    /**
     * @dev Emitted when a call is performed as part of operation `id`.
     */
    event CallExecuted(bytes32 indexed id, uint256 indexed index, address target, uint256 value, bytes data);
    /**
     * @dev Emitted when operation `id` is cancelled.
     */
    event Cancelled(bytes32 indexed id);
    /**
     * @dev Emitted when the minimum delay for future operations is modified.
     */
    event MinDelayChange(uint256 oldDuration, uint256 newDuration);
    /**
     * @dev Initializes the contract with a given `minDelay`.
     */
    constructor(
        uint256 minDelay,
        address[] memory proposers,
        address[] memory executors
    ) {
        _setRoleAdmin(TIMELOCK_ADMIN_ROLE, TIMELOCK_ADMIN_ROLE);
        _setRoleAdmin(PROPOSER_ROLE, TIMELOCK_ADMIN_ROLE);
        _setRoleAdmin(EXECUTOR_ROLE, TIMELOCK_ADMIN_ROLE);
        // deployer + self administration
        _setupRole(TIMELOCK_ADMIN_ROLE, _msgSender());
        _setupRole(TIMELOCK_ADMIN_ROLE, address(this));
        // register proposers
        for (uint256 i = 0; i < proposers.length; ++i) {
            _setupRole(PROPOSER_ROLE, proposers[i]);
        }
        // register executors
        for (uint256 i = 0; i < executors.length; ++i) {
            _setupRole(EXECUTOR_ROLE, executors[i]);
        }
        _minDelay = minDelay;
        emit MinDelayChange(0, minDelay);
    }
    /**
     * @dev Modifier to make a function callable only by a certain role. In
     * addition to checking the sender's role, `address(0)` 's role is also
     * considered. Granting a role to `address(0)` is equivalent to enabling
     * this role for everyone.
     */
    modifier onlyRoleOrOpenRole(bytes32 role) {
        if (!hasRole(role, address(0))) {
            _checkRole(role, _msgSender());
        }
        _;
    }
    /**
     * @dev Contract might receive/hold ETH as part of the maintenance process.
     */
    receive() external payable {}
    /**
     * @dev Returns whether an id correspond to a registered operation. This
     * includes both Pending, Ready and Done operations.
     */
    function isOperation(bytes32 id) public view virtual returns (bool pending) {
        return getTimestamp(id) > 0;
    }
    /**
     * @dev Returns whether an operation is pending or not.
     */
    function isOperationPending(bytes32 id) public view virtual returns (bool pending) {
        return getTimestamp(id) > _DONE_TIMESTAMP;
    }
    /**
     * @dev Returns whether an operation is ready or not.
     */
    function isOperationReady(bytes32 id) public view virtual returns (bool ready) {
        uint256 timestamp = getTimestamp(id);
        return timestamp > _DONE_TIMESTAMP && timestamp <= block.timestamp;
    }
    /**
     * @dev Returns whether an operation is done or not.
     */
    function isOperationDone(bytes32 id) public view virtual returns (bool done) {
        return getTimestamp(id) == _DONE_TIMESTAMP;
    }
    /**
     * @dev Returns the timestamp at with an operation becomes ready (0 for
     * unset operations, 1 for done operations).
     */
    function getTimestamp(bytes32 id) public view virtual returns (uint256 timestamp) {
        return _timestamps[id];
    }
    /**
     * @dev Returns the minimum delay for an operation to become valid.
     *
     * This value can be changed by executing an operation that calls `updateDelay`.
     */
    function getMinDelay() public view virtual returns (uint256 duration) {
        return _minDelay;
    }
    /**
     * @dev Returns the identifier of an operation containing a single
     * transaction.
     */
    function hashOperation(
        address target,
        uint256 value,
        bytes calldata data,
        bytes32 predecessor,
        bytes32 salt
    ) public pure virtual returns (bytes32 hash) {
        return keccak256(abi.encode(target, value, data, predecessor, salt));
    }
    /**
     * @dev Returns the identifier of an operation containing a batch of
     * transactions.
     */
    function hashOperationBatch(
        address[] calldata targets,
        uint256[] calldata values,
        bytes[] calldata datas,
        bytes32 predecessor,
        bytes32 salt
    ) public pure virtual returns (bytes32 hash) {
        return keccak256(abi.encode(targets, values, datas, predecessor, salt));
    }
    /**
     * @dev Schedule an operation containing a single transaction.
     *
     * Emits a {CallScheduled} event.
     *
     * Requirements:
     *
     * - the caller must have the 'proposer' role.
     */
    function schedule(
        address target,
        uint256 value,
        bytes calldata data,
        bytes32 predecessor,
        bytes32 salt,
        uint256 delay
    ) public virtual onlyRole(PROPOSER_ROLE) {
        bytes32 id = hashOperation(target, value, data, predecessor, salt);
        _schedule(id, delay);
        emit CallScheduled(id, 0, target, value, data, predecessor, delay);
    }
    /**
     * @dev Schedule an operation containing a batch of transactions.
     *
     * Emits one {CallScheduled} event per transaction in the batch.
     *
     * Requirements:
     *
     * - the caller must have the 'proposer' role.
     */
    function scheduleBatch(
        address[] calldata targets,
        uint256[] calldata values,
        bytes[] calldata datas,
        bytes32 predecessor,
        bytes32 salt,
        uint256 delay
    ) public virtual onlyRole(PROPOSER_ROLE) {
        require(targets.length == values.length, "TimelockController: length mismatch");
        require(targets.length == datas.length, "TimelockController: length mismatch");
        bytes32 id = hashOperationBatch(targets, values, datas, predecessor, salt);
        _schedule(id, delay);
        for (uint256 i = 0; i < targets.length; ++i) {
            emit CallScheduled(id, i, targets[i], values[i], datas[i], predecessor, delay);
        }
    }
    /**
     * @dev Schedule an operation that is to becomes valid after a given delay.
     */
    function _schedule(bytes32 id, uint256 delay) private {
        require(!isOperation(id), "TimelockController: operation already scheduled");
        require(delay >= getMinDelay(), "TimelockController: insufficient delay");
        _timestamps[id] = block.timestamp + delay;
    }
    /**
     * @dev Cancel an operation.
     *
     * Requirements:
     *
     * - the caller must have the 'proposer' role.
     */
    function cancel(bytes32 id) public virtual onlyRole(PROPOSER_ROLE) {
        require(isOperationPending(id), "TimelockController: operation cannot be cancelled");
        delete _timestamps[id];
        emit Cancelled(id);
    }
    /**
     * @dev Execute an (ready) operation containing a single transaction.
     *
     * Emits a {CallExecuted} event.
     *
     * Requirements:
     *
     * - the caller must have the 'executor' role.
     */
    function execute(
        address target,
        uint256 value,
        bytes calldata data,
        bytes32 predecessor,
        bytes32 salt
    ) public payable virtual onlyRoleOrOpenRole(EXECUTOR_ROLE) {
        bytes32 id = hashOperation(target, value, data, predecessor, salt);
        _beforeCall(id, predecessor);
        _call(id, 0, target, value, data);
        _afterCall(id);
    }
    /**
     * @dev Execute an (ready) operation containing a batch of transactions.
     *
     * Emits one {CallExecuted} event per transaction in the batch.
     *
     * Requirements:
     *
     * - the caller must have the 'executor' role.
     */
    function executeBatch(
        address[] calldata targets,
        uint256[] calldata values,
        bytes[] calldata datas,
        bytes32 predecessor,
        bytes32 salt
    ) public payable virtual onlyRoleOrOpenRole(EXECUTOR_ROLE) {
        require(targets.length == values.length, "TimelockController: length mismatch");
        require(targets.length == datas.length, "TimelockController: length mismatch");
        bytes32 id = hashOperationBatch(targets, values, datas, predecessor, salt);
        _beforeCall(id, predecessor);
        for (uint256 i = 0; i < targets.length; ++i) {
            _call(id, i, targets[i], values[i], datas[i]);
        }
        _afterCall(id);
    }
    /**
     * @dev Checks before execution of an operation's calls.
     */
    function _beforeCall(bytes32 id, bytes32 predecessor) private view {
        require(isOperationReady(id), "TimelockController: operation is not ready");
        require(predecessor == bytes32(0) || isOperationDone(predecessor), "TimelockController: missing dependency");
    }
    /**
     * @dev Checks after execution of an operation's calls.
     */
    function _afterCall(bytes32 id) private {
        require(isOperationReady(id), "TimelockController: operation is not ready");
        _timestamps[id] = _DONE_TIMESTAMP;
    }
    /**
     * @dev Execute an operation's call.
     *
     * Emits a {CallExecuted} event.
     */
    function _call(
        bytes32 id,
        uint256 index,
        address target,
        uint256 value,
        bytes calldata data
    ) private {
        (bool success, ) = target.call{value: value}(data);
        require(success, "TimelockController: underlying transaction reverted");
        emit CallExecuted(id, index, target, value, data);
    }
    /**
     * @dev Changes the minimum timelock duration for future operations.
     *
     * Emits a {MinDelayChange} event.
     *
     * Requirements:
     *
     * - the caller must be the timelock itself. This can only be achieved by scheduling and later executing
     * an operation where the timelock is the target and the data is the ABI-encoded call to this function.
     */
    function updateDelay(uint256 newDelay) external virtual {
        require(msg.sender == address(this), "TimelockController: caller must be timelock");
        emit MinDelayChange(_minDelay, newDelay);
        _minDelay = newDelay;
    }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import "@openzeppelin/contracts/governance/TimelockController.sol";
/**
 * @title DependencyStub
 * @dev Dependency Stub
 */
contract DependencyStub {
  constructor(uint256 val) {
    require(val != 0, "zero value");
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
/**
 * @title ERC20Mintable
 * @dev ERC20 minting logic
 */
contract MintableERC20 is ERC20 {
  uint8 private _decimals;
  mapping(address => uint256) public mintValues;
  constructor(
    string memory name,
    string memory symbol,
    uint8 decimals_
  ) ERC20(name, symbol) {
    _setupDecimals(decimals_);
  }
  function _setupDecimals(uint8 decimals_) internal {
    _decimals = decimals_;
  }
  function decimals() public view virtual override returns (uint8) {
    return _decimals;
  }
  /**
   * @dev Function to mint tokens
   * @param value The amount of tokens to mint.
   * @return A boolean that indicates if the operation was successful.
   */
  function mint(uint256 value) public returns (bool) {
    mintValues[_msgSender()] += value;
    require(mintValues[_msgSender()] < (1000000 * (10**_decimals)), "exceed mint limit");
    _mint(_msgSender(), value);
    return true;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import "../protocol/LendPool.sol";
contract MockLendPoolVersionN is LendPool {
  uint256 public dummy1;
  uint256 public dummy2;
  function initializeVersionN(uint256 dummy1_, uint256 dummy2_) external initializer {
    dummy1 = dummy1_;
    dummy2 = dummy2_;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
contract CryptoPunksMarket is Ownable {
  // You can use this hash to verify the image file containing all the punks
  string public imageHash = "ac39af4793119ee46bbff351d8cb6b5f23da60222126add4268e261199a2921b";
  string public standard = "CryptoPunks";
  string public name;
  string public symbol;
  uint8 public decimals;
  uint256 public totalSupply;
  uint256 public nextPunkIndexToAssign = 0;
  bool public allPunksAssigned = false;
  uint256 public punksRemainingToAssign = 0;
  //mapping (address => uint) public addressToPunkIndex;
  mapping(uint256 => address) public punkIndexToAddress;
  /* This creates an array with all balances */
  mapping(address => uint256) public balanceOf;
  struct Offer {
    bool isForSale;
    uint256 punkIndex;
    address seller;
    uint256 minValue; // in ether
    address onlySellTo; // specify to sell only to a specific person
  }
  struct Bid {
    bool hasBid;
    uint256 punkIndex;
    address bidder;
    uint256 value;
  }
  // A record of punks that are offered for sale at a specific minimum value, and perhaps to a specific person
  mapping(uint256 => Offer) public punksOfferedForSale;
  // A record of the highest punk bid
  mapping(uint256 => Bid) public punkBids;
  mapping(address => uint256) public pendingWithdrawals;
  event Assign(address indexed to, uint256 punkIndex);
  event Transfer(address indexed from, address indexed to, uint256 value);
  event PunkTransfer(address indexed from, address indexed to, uint256 punkIndex);
  event PunkOffered(uint256 indexed punkIndex, uint256 minValue, address indexed toAddress);
  event PunkBidEntered(uint256 indexed punkIndex, uint256 value, address indexed fromAddress);
  event PunkBidWithdrawn(uint256 indexed punkIndex, uint256 value, address indexed fromAddress);
  event PunkBought(uint256 indexed punkIndex, uint256 value, address indexed fromAddress, address indexed toAddress);
  event PunkNoLongerForSale(uint256 indexed punkIndex);
  /* Initializes contract with initial supply tokens to the creator of the contract */
  constructor() {
    //        balanceOf[msg.sender] = initialSupply;              // Give the creator all initial tokens
    totalSupply = 10000; // Update total supply
    punksRemainingToAssign = totalSupply;
    name = "CRYPTOPUNKS"; // Set the name for display purposes
    symbol = "\\x3FE"; // Set the symbol for display purposes Ͼ
    decimals = 0; // Amount of decimals for display purposes
  }
  function setInitialOwner(address to, uint256 punkIndex) public onlyOwner {
    require(allPunksAssigned, "CryptoPunksMarket:  allPunksAssigned");
    require(punkIndex < 10000, "CryptoPunksMarket: punkIndex overflow");
    if (punkIndexToAddress[punkIndex] != to) {
      if (punkIndexToAddress[punkIndex] != address(0)) {
        balanceOf[punkIndexToAddress[punkIndex]]--;
      } else {
        punksRemainingToAssign--;
      }
      punkIndexToAddress[punkIndex] = to;
      balanceOf[to]++;
      emit Assign(to, punkIndex);
    }
  }
  function setInitialOwners(address[] calldata addresses, uint256[] calldata indices) public onlyOwner {
    uint256 n = addresses.length;
    for (uint256 i = 0; i < n; i++) {
      setInitialOwner(addresses[i], indices[i]);
    }
  }
  function allInitialOwnersAssigned() public onlyOwner {
    allPunksAssigned = true;
  }
  function getPunk(uint256 punkIndex) public {
    require(allPunksAssigned, "CryptoPunksMarket: not allPunksAssigned");
    require(punksRemainingToAssign != 0, "CryptoPunksMarket: empty punksRemainingToAssign");
    require(punkIndexToAddress[punkIndex] == address(0), "CryptoPunksMarket: already got");
    require(punkIndex < 10000, "CryptoPunksMarket: punkIndex overflow");
    punkIndexToAddress[punkIndex] = msg.sender;
    balanceOf[msg.sender]++;
    punksRemainingToAssign--;
    emit Assign(msg.sender, punkIndex);
  }
  // Transfer ownership of a punk to another user without requiring payment
  function transferPunk(address to, uint256 punkIndex) public {
    require(allPunksAssigned, "CryptoPunksMarket: not allPunksAssigned");
    require(punkIndexToAddress[punkIndex] == msg.sender, "CryptoPunksMarket: not owner");
    require(punkIndex < 10000, "CryptoPunksMarket: punkIndex overflow");
    if (punksOfferedForSale[punkIndex].isForSale) {
      punkNoLongerForSale(punkIndex);
    }
    punkIndexToAddress[punkIndex] = to;
    balanceOf[msg.sender]--;
    balanceOf[to]++;
    emit Transfer(msg.sender, to, 1);
    emit PunkTransfer(msg.sender, to, punkIndex);
    // Check for the case where there is a bid from the new owner and refund it.
    // Any other bid can stay in place.
    Bid memory bid = punkBids[punkIndex];
    if (bid.bidder == to) {
      // Kill bid and refund value
      pendingWithdrawals[to] += bid.value;
      punkBids[punkIndex] = Bid(false, punkIndex, address(0), 0);
    }
  }
  function punkNoLongerForSale(uint256 punkIndex) public {
    require(allPunksAssigned, "CryptoPunksMarket: not allPunksAssigned");
    require(punkIndexToAddress[punkIndex] == msg.sender, "CryptoPunksMarket: not owner");
    require(punkIndex < 10000, "CryptoPunksMarket: punkIndex overflow");
    punksOfferedForSale[punkIndex] = Offer(false, punkIndex, msg.sender, 0, address(0));
    emit PunkNoLongerForSale(punkIndex);
  }
  function offerPunkForSale(uint256 punkIndex, uint256 minSalePriceInWei) public {
    require(allPunksAssigned, "CryptoPunksMarket: not allPunksAssigned");
    require(punkIndexToAddress[punkIndex] == msg.sender, "CryptoPunksMarket: not owner");
    require(punkIndex < 10000, "CryptoPunksMarket: punkIndex overflow");
    punksOfferedForSale[punkIndex] = Offer(true, punkIndex, msg.sender, minSalePriceInWei, address(0));
    emit PunkOffered(punkIndex, minSalePriceInWei, address(0));
  }
  function offerPunkForSaleToAddress(
    uint256 punkIndex,
    uint256 minSalePriceInWei,
    address toAddress
  ) public {
    require(allPunksAssigned, "CryptoPunksMarket: not allPunksAssigned");
    require(punkIndexToAddress[punkIndex] == msg.sender, "CryptoPunksMarket: not owner");
    require(punkIndex < 10000, "CryptoPunksMarket: punkIndex overflow");
    punksOfferedForSale[punkIndex] = Offer(true, punkIndex, msg.sender, minSalePriceInWei, toAddress);
    emit PunkOffered(punkIndex, minSalePriceInWei, toAddress);
  }
  function buyPunk(uint256 punkIndex) public payable {
    require(allPunksAssigned, "CryptoPunksMarket: not allPunksAssigned");
    require(punkIndex < 10000, "CryptoPunksMarket: punkIndex overflow");
    Offer memory offer = punksOfferedForSale[punkIndex];
    require(offer.isForSale, "CryptoPunksMarket: punk not actually for sale");
    require(
      offer.onlySellTo == address(0) || offer.onlySellTo == msg.sender,
      "CryptoPunksMarket: punk not supposed to be sold to this user"
    );
    require(msg.value >= offer.minValue, "CryptoPunksMarket: Didn't send enough ETH");
    require(offer.seller == punkIndexToAddress[punkIndex], "CryptoPunksMarket: Seller no longer owner of punk");
    address seller = offer.seller;
    punkIndexToAddress[punkIndex] = msg.sender;
    balanceOf[seller]--;
    balanceOf[msg.sender]++;
    emit Transfer(seller, msg.sender, 1);
    punkNoLongerForSale(punkIndex);
    pendingWithdrawals[seller] += msg.value;
    emit PunkBought(punkIndex, msg.value, seller, msg.sender);
    // Check for the case where there is a bid from the new owner and refund it.
    // Any other bid can stay in place.
    Bid memory bid = punkBids[punkIndex];
    if (bid.bidder == msg.sender) {
      // Kill bid and refund value
      pendingWithdrawals[msg.sender] += bid.value;
      punkBids[punkIndex] = Bid(false, punkIndex, address(0), 0);
    }
  }
  function withdraw() public {
    require(allPunksAssigned, "CryptoPunksMarket: not allPunksAssigned");
    uint256 amount = pendingWithdrawals[msg.sender];
    // Remember to zero the pending refund before
    // sending to prevent re-entrancy attacks
    pendingWithdrawals[msg.sender] = 0;
    _safeTransferETH(msg.sender, amount);
  }
  function enterBidForPunk(uint256 punkIndex) public payable {
    require(allPunksAssigned, "CryptoPunksMarket: not allPunksAssigned");
    require(punkIndex < 10000, "CryptoPunksMarket: punkIndex overflow");
    require(punkIndexToAddress[punkIndex] != msg.sender, "CryptoPunksMarket: can not buy your own punk");
    require(punkIndexToAddress[punkIndex] != address(0), "CryptoPunksMarket: can not buy unassigned punk");
    require(msg.value > 0, "CryptoPunksMarket: should send eth value");
    Bid memory existing = punkBids[punkIndex];
    require(msg.value > existing.value, "CryptoPunksMarket: should send more eth value");
    if (existing.value > 0) {
      // Refund the failing bid
      pendingWithdrawals[existing.bidder] += existing.value;
    }
    punkBids[punkIndex] = Bid(true, punkIndex, msg.sender, msg.value);
    emit PunkBidEntered(punkIndex, msg.value, msg.sender);
  }
  function acceptBidForPunk(uint256 punkIndex, uint256 minPrice) public {
    require(allPunksAssigned, "CryptoPunksMarket: not allPunksAssigned");
    require(punkIndexToAddress[punkIndex] == msg.sender, "CryptoPunksMarket: not owner");
    require(punkIndex < 10000, "CryptoPunksMarket: punkIndex overflow");
    address seller = msg.sender;
    Bid memory bid = punkBids[punkIndex];
    require(bid.value >= minPrice, "CryptoPunksMarket: bid value to small");
    punkIndexToAddress[punkIndex] = bid.bidder;
    balanceOf[seller]--;
    balanceOf[bid.bidder]++;
    emit Transfer(seller, bid.bidder, 1);
    punksOfferedForSale[punkIndex] = Offer(false, punkIndex, bid.bidder, 0, address(0));
    uint256 amount = bid.value;
    punkBids[punkIndex] = Bid(false, punkIndex, address(0), 0);
    pendingWithdrawals[seller] += amount;
    emit PunkBought(punkIndex, bid.value, seller, bid.bidder);
  }
  function withdrawBidForPunk(uint256 punkIndex) public {
    require(punkIndex < 10000, "CryptoPunksMarket: punkIndex overflow");
    require(allPunksAssigned, "CryptoPunksMarket: not allPunksAssigned");
    require(punkIndexToAddress[punkIndex] != address(0), "CryptoPunksMarket: punk not assigned");
    require(punkIndexToAddress[punkIndex] != msg.sender, "CryptoPunksMarket: can not withdraw self");
    Bid memory bid = punkBids[punkIndex];
    require(bid.bidder == msg.sender, "CryptoPunksMakrket: not bid bidder");
    emit PunkBidWithdrawn(punkIndex, bid.value, msg.sender);
    uint256 amount = bid.value;
    punkBids[punkIndex] = Bid(false, punkIndex, address(0), 0);
    // Refund the bid money
    _safeTransferETH(msg.sender, amount);
  }
  /**
   * @dev transfer ETH to an address, revert if it fails.
   * @param to recipient of the transfer
   * @param value the amount to send
   */
  function _safeTransferETH(address to, uint256 value) internal {
    (bool success, ) = to.call{value: value}(new bytes(0));
    require(success, "ETH_TRANSFER_FAILED");
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
// Prettier ignore to prevent buidler flatter bug
// prettier-ignore
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
import {BendUpgradeableProxy} from "../libraries/proxy/BendUpgradeableProxy.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {Address} from "@openzeppelin/contracts/utils/Address.sol";
/**
 * @title LendPoolAddressesProvider contract
 * @dev Main registry of addresses part of or connected to the protocol, including permissioned roles
 * - Acting also as factory of proxies and admin of those, so with right to change its implementations
 * - Owned by the Bend Governance
 * @author Bend
 **/
contract LendPoolAddressesProvider is Ownable, ILendPoolAddressesProvider {
  string private _marketId;
  mapping(bytes32 => address) private _addresses;
  bytes32 private constant LEND_POOL = "LEND_POOL";
  bytes32 private constant LEND_POOL_CONFIGURATOR = "LEND_POOL_CONFIGURATOR";
  bytes32 private constant POOL_ADMIN = "POOL_ADMIN";
  bytes32 private constant EMERGENCY_ADMIN = "EMERGENCY_ADMIN";
  bytes32 private constant RESERVE_ORACLE = "RESERVE_ORACLE";
  bytes32 private constant NFT_ORACLE = "NFT_ORACLE";
  bytes32 private constant BEND_ORACLE = "BEND_ORACLE";
  bytes32 private constant LEND_POOL_LOAN = "LEND_POOL_LOAN";
  bytes32 private constant BNFT_REGISTRY = "BNFT_REGISTRY";
  bytes32 private constant LEND_POOL_LIQUIDATOR = "LEND_POOL_LIQUIDATOR";
  bytes32 private constant INCENTIVES_CONTROLLER = "INCENTIVES_CONTROLLER";
  bytes32 private constant BEND_DATA_PROVIDER = "BEND_DATA_PROVIDER";
  bytes32 private constant UI_DATA_PROVIDER = "UI_DATA_PROVIDER";
  bytes32 private constant WALLET_BALANCE_PROVIDER = "WALLET_BALANCE_PROVIDER";
  constructor(string memory marketId) {
    _setMarketId(marketId);
  }
  /**
   * @dev Returns the id of the Bend market to which this contracts points to
   * @return The market id
   **/
  function getMarketId() external view override returns (string memory) {
    return _marketId;
  }
  /**
   * @dev Allows to set the market which this LendPoolAddressesProvider represents
   * @param marketId The market id
   */
  function setMarketId(string memory marketId) external override onlyOwner {
    _setMarketId(marketId);
  }
  /**
   * @dev General function to update the implementation of a proxy registered with
   * certain `id`. If there is no proxy registered, it will instantiate one and
   * set as implementation the `implementationAddress`
   * IMPORTANT Use this function carefully, only for ids that don't have an explicit
   * setter function, in order to avoid unexpected consequences
   * @param id The id
   * @param implementationAddress The address of the new implementation
   */
  function setAddressAsProxy(
    bytes32 id,
    address implementationAddress,
    bytes memory encodedCallData
  ) external override onlyOwner {
    _updateImpl(id, implementationAddress);
    emit AddressSet(id, implementationAddress, true, encodedCallData);
    if (encodedCallData.length > 0) {
      Address.functionCall(_addresses[id], encodedCallData);
    }
  }
  /**
   * @dev Sets an address for an id replacing the address saved in the addresses map
   * IMPORTANT Use this function carefully, as it will do a hard replacement
   * @param id The id
   * @param newAddress The address to set
   */
  function setAddress(bytes32 id, address newAddress) external override onlyOwner {
    _addresses[id] = newAddress;
    emit AddressSet(id, newAddress, false, new bytes(0));
  }
  /**
   * @dev Returns an address by id
   * @return The address
   */
  function getAddress(bytes32 id) public view override returns (address) {
    return _addresses[id];
  }
  /**
   * @dev Returns the address of the LendPool proxy
   * @return The LendPool proxy address
   **/
  function getLendPool() external view override returns (address) {
    return getAddress(LEND_POOL);
  }
  /**
   * @dev Updates the implementation of the LendPool, or creates the proxy
   * setting the new `pool` implementation on the first time calling it
   * @param pool The new LendPool implementation
   **/
  function setLendPoolImpl(address pool, bytes memory encodedCallData) external override onlyOwner {
    _updateImpl(LEND_POOL, pool);
    emit LendPoolUpdated(pool, encodedCallData);
    if (encodedCallData.length > 0) {
      Address.functionCall(_addresses[LEND_POOL], encodedCallData);
    }
  }
  /**
   * @dev Returns the address of the LendPoolConfigurator proxy
   * @return The LendPoolConfigurator proxy address
   **/
  function getLendPoolConfigurator() external view override returns (address) {
    return getAddress(LEND_POOL_CONFIGURATOR);
  }
  /**
   * @dev Updates the implementation of the LendPoolConfigurator, or creates the proxy
   * setting the new `configurator` implementation on the first time calling it
   * @param configurator The new LendPoolConfigurator implementation
   **/
  function setLendPoolConfiguratorImpl(address configurator, bytes memory encodedCallData) external override onlyOwner {
    _updateImpl(LEND_POOL_CONFIGURATOR, configurator);
    emit LendPoolConfiguratorUpdated(configurator, encodedCallData);
    if (encodedCallData.length > 0) {
      Address.functionCall(_addresses[LEND_POOL_CONFIGURATOR], encodedCallData);
    }
  }
  /**
   * @dev The functions below are getters/setters of addresses that are outside the context
   * of the protocol hence the upgradable proxy pattern is not used
   **/
  function getPoolAdmin() external view override returns (address) {
    return getAddress(POOL_ADMIN);
  }
  function setPoolAdmin(address admin) external override onlyOwner {
    _addresses[POOL_ADMIN] = admin;
    emit ConfigurationAdminUpdated(admin);
  }
  function getEmergencyAdmin() external view override returns (address) {
    return getAddress(EMERGENCY_ADMIN);
  }
  function setEmergencyAdmin(address emergencyAdmin) external override onlyOwner {
    _addresses[EMERGENCY_ADMIN] = emergencyAdmin;
    emit EmergencyAdminUpdated(emergencyAdmin);
  }
  function getReserveOracle() external view override returns (address) {
    return getAddress(RESERVE_ORACLE);
  }
  function setReserveOracle(address reserveOracle) external override onlyOwner {
    _addresses[RESERVE_ORACLE] = reserveOracle;
    emit ReserveOracleUpdated(reserveOracle);
  }
  function getNFTOracle() external view override returns (address) {
    return getAddress(NFT_ORACLE);
  }
  function setNFTOracle(address nftOracle) external override onlyOwner {
    _addresses[NFT_ORACLE] = nftOracle;
    emit NftOracleUpdated(nftOracle);
  }
  function getLendPoolLoan() external view override returns (address) {
    return getAddress(LEND_POOL_LOAN);
  }
  function setLendPoolLoanImpl(address loanAddress, bytes memory encodedCallData) external override onlyOwner {
    _updateImpl(LEND_POOL_LOAN, loanAddress);
    emit LendPoolLoanUpdated(loanAddress, encodedCallData);
    if (encodedCallData.length > 0) {
      Address.functionCall(_addresses[LEND_POOL_LOAN], encodedCallData);
    }
  }
  function getBNFTRegistry() external view override returns (address) {
    return getAddress(BNFT_REGISTRY);
  }
  function setBNFTRegistry(address factory) external override onlyOwner {
    _addresses[BNFT_REGISTRY] = factory;
    emit BNFTRegistryUpdated(factory);
  }
  function getLendPoolLiquidator() external view override returns (address) {
    return getAddress(LEND_POOL_LIQUIDATOR);
  }
  function setLendPoolLiquidator(address liquidator) external override onlyOwner {
    _addresses[LEND_POOL_LIQUIDATOR] = liquidator;
    emit LendPoolLiquidatorUpdated(liquidator);
  }
  function getIncentivesController() external view override returns (address) {
    return getAddress(INCENTIVES_CONTROLLER);
  }
  function setIncentivesController(address controller) external override onlyOwner {
    _addresses[INCENTIVES_CONTROLLER] = controller;
    emit IncentivesControllerUpdated(controller);
  }
  function getUIDataProvider() external view override returns (address) {
    return getAddress(UI_DATA_PROVIDER);
  }
  function setUIDataProvider(address provider) external override onlyOwner {
    _addresses[UI_DATA_PROVIDER] = provider;
    emit UIDataProviderUpdated(provider);
  }
  function getBendDataProvider() external view override returns (address) {
    return getAddress(BEND_DATA_PROVIDER);
  }
  function setBendDataProvider(address provider) external override onlyOwner {
    _addresses[BEND_DATA_PROVIDER] = provider;
    emit BendDataProviderUpdated(provider);
  }
  function getWalletBalanceProvider() external view override returns (address) {
    return getAddress(WALLET_BALANCE_PROVIDER);
  }
  function setWalletBalanceProvider(address provider) external override onlyOwner {
    _addresses[WALLET_BALANCE_PROVIDER] = provider;
    emit WalletBalanceProviderUpdated(provider);
  }
  function getImplementation(address proxyAddress) external view onlyOwner returns (address) {
    BendUpgradeableProxy proxy = BendUpgradeableProxy(payable(proxyAddress));
    return proxy.getImplementation();
  }
  /**
   * @dev Internal function to update the implementation of a specific proxied component of the protocol
   * - If there is no proxy registered in the given `id`, it creates the proxy setting `newAdress`
   *   as implementation and calls the initialize() function on the proxy
   * - If there is already a proxy registered, it just updates the implementation to `newAddress` and
   *   calls the encoded method function via upgradeToAndCall() in the proxy
   * @param id The id of the proxy to be updated
   * @param newAddress The address of the new implementation
   **/
  function _updateImpl(bytes32 id, address newAddress) internal {
    address payable proxyAddress = payable(_addresses[id]);
    if (proxyAddress == address(0)) {
      bytes memory params = abi.encodeWithSignature("initialize(address)", address(this));
      // create proxy, then init proxy & implementation
      BendUpgradeableProxy proxy = new BendUpgradeableProxy(newAddress, address(this), params);
      _addresses[id] = address(proxy);
      emit ProxyCreated(id, address(proxy));
    } else {
      // upgrade implementation
      BendUpgradeableProxy proxy = BendUpgradeableProxy(proxyAddress);
      proxy.upgradeTo(newAddress);
    }
  }
  function _setMarketId(string memory marketId) internal {
    _marketId = marketId;
    emit MarketIdSet(marketId);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title LendPoolAddressesProvider contract
 * @dev Main registry of addresses part of or connected to the protocol, including permissioned roles
 * - Acting also as factory of proxies and admin of those, so with right to change its implementations
 * - Owned by the Bend Governance
 * @author Bend
 **/
interface ILendPoolAddressesProvider {
  event MarketIdSet(string newMarketId);
  event LendPoolUpdated(address indexed newAddress, bytes encodedCallData);
  event ConfigurationAdminUpdated(address indexed newAddress);
  event EmergencyAdminUpdated(address indexed newAddress);
  event LendPoolConfiguratorUpdated(address indexed newAddress, bytes encodedCallData);
  event ReserveOracleUpdated(address indexed newAddress);
  event NftOracleUpdated(address indexed newAddress);
  event LendPoolLoanUpdated(address indexed newAddress, bytes encodedCallData);
  event ProxyCreated(bytes32 id, address indexed newAddress);
  event AddressSet(bytes32 id, address indexed newAddress, bool hasProxy, bytes encodedCallData);
  event BNFTRegistryUpdated(address indexed newAddress);
  event LendPoolLiquidatorUpdated(address indexed newAddress);
  event IncentivesControllerUpdated(address indexed newAddress);
  event UIDataProviderUpdated(address indexed newAddress);
  event BendDataProviderUpdated(address indexed newAddress);
  event WalletBalanceProviderUpdated(address indexed newAddress);
  function getMarketId() external view returns (string memory);
  function setMarketId(string calldata marketId) external;
  function setAddress(bytes32 id, address newAddress) external;
  function setAddressAsProxy(
    bytes32 id,
    address impl,
    bytes memory encodedCallData
  ) external;
  function getAddress(bytes32 id) external view returns (address);
  function getLendPool() external view returns (address);
  function setLendPoolImpl(address pool, bytes memory encodedCallData) external;
  function getLendPoolConfigurator() external view returns (address);
  function setLendPoolConfiguratorImpl(address configurator, bytes memory encodedCallData) external;
  function getPoolAdmin() external view returns (address);
  function setPoolAdmin(address admin) external;
  function getEmergencyAdmin() external view returns (address);
  function setEmergencyAdmin(address admin) external;
  function getReserveOracle() external view returns (address);
  function setReserveOracle(address reserveOracle) external;
  function getNFTOracle() external view returns (address);
  function setNFTOracle(address nftOracle) external;
  function getLendPoolLoan() external view returns (address);
  function setLendPoolLoanImpl(address loan, bytes memory encodedCallData) external;
  function getBNFTRegistry() external view returns (address);
  function setBNFTRegistry(address factory) external;
  function getLendPoolLiquidator() external view returns (address);
  function setLendPoolLiquidator(address liquidator) external;
  function getIncentivesController() external view returns (address);
  function setIncentivesController(address controller) external;
  function getUIDataProvider() external view returns (address);
  function setUIDataProvider(address provider) external;
  function getBendDataProvider() external view returns (address);
  function setBendDataProvider(address provider) external;
  function getWalletBalanceProvider() external view returns (address);
  function setWalletBalanceProvider(address provider) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {TransparentUpgradeableProxy} from "@openzeppelin/contracts/proxy/transparent/TransparentUpgradeableProxy.sol";
import "../helpers/Errors.sol";
contract BendUpgradeableProxy is TransparentUpgradeableProxy {
  constructor(
    address _logic,
    address admin_,
    bytes memory _data
  ) payable TransparentUpgradeableProxy(_logic, admin_, _data) {}
  modifier OnlyAdmin() {
    require(msg.sender == _getAdmin(), Errors.CALLER_NOT_POOL_ADMIN);
    _;
  }
  function getImplementation() external view OnlyAdmin returns (address) {
    return _getImplementation();
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)
pragma solidity ^0.8.0;
/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/transparent/TransparentUpgradeableProxy.sol)
pragma solidity ^0.8.0;
import "../ERC1967/ERC1967Proxy.sol";
/**
 * @dev This contract implements a proxy that is upgradeable by an admin.
 *
 * To avoid https://medium.com/nomic-labs-blog/malicious-backdoors-in-ethereum-proxies-62629adf3357[proxy selector
 * clashing], which can potentially be used in an attack, this contract uses the
 * https://blog.openzeppelin.com/the-transparent-proxy-pattern/[transparent proxy pattern]. This pattern implies two
 * things that go hand in hand:
 *
 * 1. If any account other than the admin calls the proxy, the call will be forwarded to the implementation, even if
 * that call matches one of the admin functions exposed by the proxy itself.
 * 2. If the admin calls the proxy, it can access the admin functions, but its calls will never be forwarded to the
 * implementation. If the admin tries to call a function on the implementation it will fail with an error that says
 * "admin cannot fallback to proxy target".
 *
 * These properties mean that the admin account can only be used for admin actions like upgrading the proxy or changing
 * the admin, so it's best if it's a dedicated account that is not used for anything else. This will avoid headaches due
 * to sudden errors when trying to call a function from the proxy implementation.
 *
 * Our recommendation is for the dedicated account to be an instance of the {ProxyAdmin} contract. If set up this way,
 * you should think of the `ProxyAdmin` instance as the real administrative interface of your proxy.
 */
contract TransparentUpgradeableProxy is ERC1967Proxy {
    /**
     * @dev Initializes an upgradeable proxy managed by `_admin`, backed by the implementation at `_logic`, and
     * optionally initialized with `_data` as explained in {ERC1967Proxy-constructor}.
     */
    constructor(
        address _logic,
        address admin_,
        bytes memory _data
    ) payable ERC1967Proxy(_logic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        _changeAdmin(admin_);
    }
    /**
     * @dev Modifier used internally that will delegate the call to the implementation unless the sender is the admin.
     */
    modifier ifAdmin() {
        if (msg.sender == _getAdmin()) {
            _;
        } else {
            _fallback();
        }
    }
    /**
     * @dev Returns the current admin.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyAdmin}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function admin() external ifAdmin returns (address admin_) {
        admin_ = _getAdmin();
    }
    /**
     * @dev Returns the current implementation.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyImplementation}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc`
     */
    function implementation() external ifAdmin returns (address implementation_) {
        implementation_ = _implementation();
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-changeProxyAdmin}.
     */
    function changeAdmin(address newAdmin) external virtual ifAdmin {
        _changeAdmin(newAdmin);
    }
    /**
     * @dev Upgrade the implementation of the proxy.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgrade}.
     */
    function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeToAndCall(newImplementation, bytes(""), false);
    }
    /**
     * @dev Upgrade the implementation of the proxy, and then call a function from the new implementation as specified
     * by `data`, which should be an encoded function call. This is useful to initialize new storage variables in the
     * proxied contract.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgradeAndCall}.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable ifAdmin {
        _upgradeToAndCall(newImplementation, data, true);
    }
    /**
     * @dev Returns the current admin.
     */
    function _admin() internal view virtual returns (address) {
        return _getAdmin();
    }
    /**
     * @dev Makes sure the admin cannot access the fallback function. See {Proxy-_beforeFallback}.
     */
    function _beforeFallback() internal virtual override {
        require(msg.sender != _getAdmin(), "TransparentUpgradeableProxy: admin cannot fallback to proxy target");
        super._beforeFallback();
    }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title Errors library
 * @author Bend
 * @notice Defines the error messages emitted by the different contracts of the Bend protocol
 */
library Errors {
  enum ReturnCode {
    SUCCESS,
    FAILED
  }
  string public constant SUCCESS = "0";
  //common errors
  string public constant CALLER_NOT_POOL_ADMIN = "100"; // 'The caller must be the pool admin'
  string public constant CALLER_NOT_ADDRESS_PROVIDER = "101";
  string public constant INVALID_FROM_BALANCE_AFTER_TRANSFER = "102";
  string public constant INVALID_TO_BALANCE_AFTER_TRANSFER = "103";
  //math library erros
  string public constant MATH_MULTIPLICATION_OVERFLOW = "200";
  string public constant MATH_ADDITION_OVERFLOW = "201";
  string public constant MATH_DIVISION_BY_ZERO = "202";
  //validation & check errors
  string public constant VL_INVALID_AMOUNT = "301"; // 'Amount must be greater than 0'
  string public constant VL_NO_ACTIVE_RESERVE = "302"; // 'Action requires an active reserve'
  string public constant VL_RESERVE_FROZEN = "303"; // 'Action cannot be performed because the reserve is frozen'
  string public constant VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE = "304"; // 'User cannot withdraw more than the available balance'
  string public constant VL_BORROWING_NOT_ENABLED = "305"; // 'Borrowing is not enabled'
  string public constant VL_COLLATERAL_BALANCE_IS_0 = "306"; // 'The collateral balance is 0'
  string public constant VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD = "307"; // 'Health factor is lesser than the liquidation threshold'
  string public constant VL_COLLATERAL_CANNOT_COVER_NEW_BORROW = "308"; // 'There is not enough collateral to cover a new borrow'
  string public constant VL_NO_DEBT_OF_SELECTED_TYPE = "309"; // 'for repayment of stable debt, the user needs to have stable debt, otherwise, he needs to have variable debt'
  string public constant VL_NO_ACTIVE_NFT = "310";
  string public constant VL_NFT_FROZEN = "311";
  string public constant VL_SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER = "312"; // 'User did not borrow the specified currency'
  string public constant VL_INVALID_HEALTH_FACTOR = "313";
  string public constant VL_INVALID_ONBEHALFOF_ADDRESS = "314";
  string public constant VL_INVALID_TARGET_ADDRESS = "315";
  string public constant VL_INVALID_RESERVE_ADDRESS = "316";
  string public constant VL_SPECIFIED_LOAN_NOT_BORROWED_BY_USER = "317";
  string public constant VL_SPECIFIED_RESERVE_NOT_BORROWED_BY_USER = "318";
  string public constant VL_HEALTH_FACTOR_HIGHER_THAN_LIQUIDATION_THRESHOLD = "319";
  //lend pool errors
  string public constant LP_CALLER_NOT_LEND_POOL_CONFIGURATOR = "400"; // 'The caller of the function is not the lending pool configurator'
  string public constant LP_IS_PAUSED = "401"; // 'Pool is paused'
  string public constant LP_NO_MORE_RESERVES_ALLOWED = "402";
  string public constant LP_NOT_CONTRACT = "403";
  string public constant LP_BORROW_NOT_EXCEED_LIQUIDATION_THRESHOLD = "404";
  string public constant LP_BORROW_IS_EXCEED_LIQUIDATION_PRICE = "405";
  string public constant LP_NO_MORE_NFTS_ALLOWED = "406";
  string public constant LP_INVALIED_USER_NFT_AMOUNT = "407";
  string public constant LP_INCONSISTENT_PARAMS = "408";
  string public constant LP_NFT_IS_NOT_USED_AS_COLLATERAL = "409";
  string public constant LP_CALLER_MUST_BE_AN_BTOKEN = "410";
  string public constant LP_INVALIED_NFT_AMOUNT = "411";
  string public constant LP_NFT_HAS_USED_AS_COLLATERAL = "412";
  string public constant LP_DELEGATE_CALL_FAILED = "413";
  string public constant LP_AMOUNT_LESS_THAN_EXTRA_DEBT = "414";
  string public constant LP_AMOUNT_LESS_THAN_REDEEM_THRESHOLD = "415";
  //lend pool loan errors
  string public constant LPL_INVALID_LOAN_STATE = "480";
  string public constant LPL_INVALID_LOAN_AMOUNT = "481";
  string public constant LPL_INVALID_TAKEN_AMOUNT = "482";
  string public constant LPL_AMOUNT_OVERFLOW = "483";
  string public constant LPL_BID_PRICE_LESS_THAN_LIQUIDATION_PRICE = "484";
  string public constant LPL_BID_PRICE_LESS_THAN_HIGHEST_PRICE = "485";
  string public constant LPL_BID_REDEEM_DURATION_HAS_END = "486";
  string public constant LPL_BID_USER_NOT_SAME = "487";
  string public constant LPL_BID_REPAY_AMOUNT_NOT_ENOUGH = "488";
  string public constant LPL_BID_AUCTION_DURATION_HAS_END = "489";
  string public constant LPL_BID_AUCTION_DURATION_NOT_END = "490";
  string public constant LPL_BID_PRICE_LESS_THAN_BORROW = "491";
  string public constant LPL_INVALID_BIDDER_ADDRESS = "492";
  string public constant LPL_AMOUNT_LESS_THAN_BID_FINE = "493";
  //common token errors
  string public constant CT_CALLER_MUST_BE_LEND_POOL = "500"; // 'The caller of this function must be a lending pool'
  string public constant CT_INVALID_MINT_AMOUNT = "501"; //invalid amount to mint
  string public constant CT_INVALID_BURN_AMOUNT = "502"; //invalid amount to burn
  //reserve logic errors
  string public constant RL_RESERVE_ALREADY_INITIALIZED = "601"; // 'Reserve has already been initialized'
  string public constant RL_LIQUIDITY_INDEX_OVERFLOW = "602"; //  Liquidity index overflows uint128
  string public constant RL_VARIABLE_BORROW_INDEX_OVERFLOW = "603"; //  Variable borrow index overflows uint128
  string public constant RL_LIQUIDITY_RATE_OVERFLOW = "604"; //  Liquidity rate overflows uint128
  string public constant RL_VARIABLE_BORROW_RATE_OVERFLOW = "605"; //  Variable borrow rate overflows uint128
  //configure errors
  string public constant LPC_RESERVE_LIQUIDITY_NOT_0 = "700"; // 'The liquidity of the reserve needs to be 0'
  string public constant LPC_INVALID_CONFIGURATION = "701"; // 'Invalid risk parameters for the reserve'
  string public constant LPC_CALLER_NOT_EMERGENCY_ADMIN = "702"; // 'The caller must be the emergency admin'
  string public constant LPC_INVALIED_BNFT_ADDRESS = "703";
  string public constant LPC_INVALIED_LOAN_ADDRESS = "704";
  string public constant LPC_NFT_LIQUIDITY_NOT_0 = "705";
  //reserve config errors
  string public constant RC_INVALID_LTV = "730";
  string public constant RC_INVALID_LIQ_THRESHOLD = "731";
  string public constant RC_INVALID_LIQ_BONUS = "732";
  string public constant RC_INVALID_DECIMALS = "733";
  string public constant RC_INVALID_RESERVE_FACTOR = "734";
  string public constant RC_INVALID_REDEEM_DURATION = "735";
  string public constant RC_INVALID_AUCTION_DURATION = "736";
  string public constant RC_INVALID_REDEEM_FINE = "737";
  string public constant RC_INVALID_REDEEM_THRESHOLD = "738";
  //address provider erros
  string public constant LPAPR_PROVIDER_NOT_REGISTERED = "760"; // 'Provider is not registered'
  string public constant LPAPR_INVALID_ADDRESSES_PROVIDER_ID = "761";
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/ERC1967/ERC1967Proxy.sol)
pragma solidity ^0.8.0;
import "../Proxy.sol";
import "./ERC1967Upgrade.sol";
/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 */
contract ERC1967Proxy is Proxy, ERC1967Upgrade {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     *
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _upgradeToAndCall(_logic, _data, false);
    }
    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal view virtual override returns (address impl) {
        return ERC1967Upgrade._getImplementation();
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/Proxy.sol)
pragma solidity ^0.8.0;
/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())
            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())
            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }
    /**
     * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);
    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback() external payable virtual {
        _fallback();
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive() external payable virtual {
        _fallback();
    }
    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/ERC1967/ERC1967Upgrade.sol)
pragma solidity ^0.8.2;
import "../beacon/IBeacon.sol";
import "../../utils/Address.sol";
import "../../utils/StorageSlot.sol";
/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 *
 * @custom:oz-upgrades-unsafe-allow delegatecall
 */
abstract contract ERC1967Upgrade {
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);
    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }
    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }
    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
    }
    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallSecure(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        address oldImplementation = _getImplementation();
        // Initial upgrade and setup call
        _setImplementation(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
        // Perform rollback test if not already in progress
        StorageSlot.BooleanSlot storage rollbackTesting = StorageSlot.getBooleanSlot(_ROLLBACK_SLOT);
        if (!rollbackTesting.value) {
            // Trigger rollback using upgradeTo from the new implementation
            rollbackTesting.value = true;
            Address.functionDelegateCall(
                newImplementation,
                abi.encodeWithSignature("upgradeTo(address)", oldImplementation)
            );
            rollbackTesting.value = false;
            // Check rollback was effective
            require(oldImplementation == _getImplementation(), "ERC1967Upgrade: upgrade breaks further upgrades");
            // Finally reset to the new implementation and log the upgrade
            _upgradeTo(newImplementation);
        }
    }
    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);
    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlot.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }
    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;
    /**
     * @dev Emitted when the beacon is upgraded.
     */
    event BeaconUpgraded(address indexed beacon);
    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(_BEACON_SLOT).value;
    }
    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(Address.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            Address.isContract(IBeacon(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlot.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }
    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(
        address newBeacon,
        bytes memory data,
        bool forceCall
    ) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)
pragma solidity ^0.8.0;
/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/StorageSlot.sol)
pragma solidity ^0.8.0;
/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }
    struct BooleanSlot {
        bool value;
    }
    struct Bytes32Slot {
        bytes32 value;
    }
    struct Uint256Slot {
        uint256 value;
    }
    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {TransparentUpgradeableProxy} from "@openzeppelin/contracts/proxy/transparent/TransparentUpgradeableProxy.sol";
import "../helpers/Errors.sol";
contract BendUpgradeableProxy is TransparentUpgradeableProxy {
  constructor(
    address _logic,
    address admin_,
    bytes memory _data
  ) payable TransparentUpgradeableProxy(_logic, admin_, _data) {}
  modifier OnlyAdmin() {
    require(msg.sender == _getAdmin(), Errors.CALLER_NOT_POOL_ADMIN);
    _;
  }
  function getImplementation() external view OnlyAdmin returns (address) {
    return _getImplementation();
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/transparent/TransparentUpgradeableProxy.sol)
pragma solidity ^0.8.0;
import "../ERC1967/ERC1967Proxy.sol";
/**
 * @dev This contract implements a proxy that is upgradeable by an admin.
 *
 * To avoid https://medium.com/nomic-labs-blog/malicious-backdoors-in-ethereum-proxies-62629adf3357[proxy selector
 * clashing], which can potentially be used in an attack, this contract uses the
 * https://blog.openzeppelin.com/the-transparent-proxy-pattern/[transparent proxy pattern]. This pattern implies two
 * things that go hand in hand:
 *
 * 1. If any account other than the admin calls the proxy, the call will be forwarded to the implementation, even if
 * that call matches one of the admin functions exposed by the proxy itself.
 * 2. If the admin calls the proxy, it can access the admin functions, but its calls will never be forwarded to the
 * implementation. If the admin tries to call a function on the implementation it will fail with an error that says
 * "admin cannot fallback to proxy target".
 *
 * These properties mean that the admin account can only be used for admin actions like upgrading the proxy or changing
 * the admin, so it's best if it's a dedicated account that is not used for anything else. This will avoid headaches due
 * to sudden errors when trying to call a function from the proxy implementation.
 *
 * Our recommendation is for the dedicated account to be an instance of the {ProxyAdmin} contract. If set up this way,
 * you should think of the `ProxyAdmin` instance as the real administrative interface of your proxy.
 */
contract TransparentUpgradeableProxy is ERC1967Proxy {
    /**
     * @dev Initializes an upgradeable proxy managed by `_admin`, backed by the implementation at `_logic`, and
     * optionally initialized with `_data` as explained in {ERC1967Proxy-constructor}.
     */
    constructor(
        address _logic,
        address admin_,
        bytes memory _data
    ) payable ERC1967Proxy(_logic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        _changeAdmin(admin_);
    }
    /**
     * @dev Modifier used internally that will delegate the call to the implementation unless the sender is the admin.
     */
    modifier ifAdmin() {
        if (msg.sender == _getAdmin()) {
            _;
        } else {
            _fallback();
        }
    }
    /**
     * @dev Returns the current admin.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyAdmin}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function admin() external ifAdmin returns (address admin_) {
        admin_ = _getAdmin();
    }
    /**
     * @dev Returns the current implementation.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyImplementation}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc`
     */
    function implementation() external ifAdmin returns (address implementation_) {
        implementation_ = _implementation();
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-changeProxyAdmin}.
     */
    function changeAdmin(address newAdmin) external virtual ifAdmin {
        _changeAdmin(newAdmin);
    }
    /**
     * @dev Upgrade the implementation of the proxy.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgrade}.
     */
    function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeToAndCall(newImplementation, bytes(""), false);
    }
    /**
     * @dev Upgrade the implementation of the proxy, and then call a function from the new implementation as specified
     * by `data`, which should be an encoded function call. This is useful to initialize new storage variables in the
     * proxied contract.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgradeAndCall}.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable ifAdmin {
        _upgradeToAndCall(newImplementation, data, true);
    }
    /**
     * @dev Returns the current admin.
     */
    function _admin() internal view virtual returns (address) {
        return _getAdmin();
    }
    /**
     * @dev Makes sure the admin cannot access the fallback function. See {Proxy-_beforeFallback}.
     */
    function _beforeFallback() internal virtual override {
        require(msg.sender != _getAdmin(), "TransparentUpgradeableProxy: admin cannot fallback to proxy target");
        super._beforeFallback();
    }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title Errors library
 * @author Bend
 * @notice Defines the error messages emitted by the different contracts of the Bend protocol
 */
library Errors {
  enum ReturnCode {
    SUCCESS,
    FAILED
  }
  string public constant SUCCESS = "0";
  //common errors
  string public constant CALLER_NOT_POOL_ADMIN = "100"; // 'The caller must be the pool admin'
  string public constant CALLER_NOT_ADDRESS_PROVIDER = "101";
  string public constant INVALID_FROM_BALANCE_AFTER_TRANSFER = "102";
  string public constant INVALID_TO_BALANCE_AFTER_TRANSFER = "103";
  //math library erros
  string public constant MATH_MULTIPLICATION_OVERFLOW = "200";
  string public constant MATH_ADDITION_OVERFLOW = "201";
  string public constant MATH_DIVISION_BY_ZERO = "202";
  //validation & check errors
  string public constant VL_INVALID_AMOUNT = "301"; // 'Amount must be greater than 0'
  string public constant VL_NO_ACTIVE_RESERVE = "302"; // 'Action requires an active reserve'
  string public constant VL_RESERVE_FROZEN = "303"; // 'Action cannot be performed because the reserve is frozen'
  string public constant VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE = "304"; // 'User cannot withdraw more than the available balance'
  string public constant VL_BORROWING_NOT_ENABLED = "305"; // 'Borrowing is not enabled'
  string public constant VL_COLLATERAL_BALANCE_IS_0 = "306"; // 'The collateral balance is 0'
  string public constant VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD = "307"; // 'Health factor is lesser than the liquidation threshold'
  string public constant VL_COLLATERAL_CANNOT_COVER_NEW_BORROW = "308"; // 'There is not enough collateral to cover a new borrow'
  string public constant VL_NO_DEBT_OF_SELECTED_TYPE = "309"; // 'for repayment of stable debt, the user needs to have stable debt, otherwise, he needs to have variable debt'
  string public constant VL_NO_ACTIVE_NFT = "310";
  string public constant VL_NFT_FROZEN = "311";
  string public constant VL_SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER = "312"; // 'User did not borrow the specified currency'
  string public constant VL_INVALID_HEALTH_FACTOR = "313";
  string public constant VL_INVALID_ONBEHALFOF_ADDRESS = "314";
  string public constant VL_INVALID_TARGET_ADDRESS = "315";
  string public constant VL_INVALID_RESERVE_ADDRESS = "316";
  string public constant VL_SPECIFIED_LOAN_NOT_BORROWED_BY_USER = "317";
  string public constant VL_SPECIFIED_RESERVE_NOT_BORROWED_BY_USER = "318";
  string public constant VL_HEALTH_FACTOR_HIGHER_THAN_LIQUIDATION_THRESHOLD = "319";
  //lend pool errors
  string public constant LP_CALLER_NOT_LEND_POOL_CONFIGURATOR = "400"; // 'The caller of the function is not the lending pool configurator'
  string public constant LP_IS_PAUSED = "401"; // 'Pool is paused'
  string public constant LP_NO_MORE_RESERVES_ALLOWED = "402";
  string public constant LP_NOT_CONTRACT = "403";
  string public constant LP_BORROW_NOT_EXCEED_LIQUIDATION_THRESHOLD = "404";
  string public constant LP_BORROW_IS_EXCEED_LIQUIDATION_PRICE = "405";
  string public constant LP_NO_MORE_NFTS_ALLOWED = "406";
  string public constant LP_INVALIED_USER_NFT_AMOUNT = "407";
  string public constant LP_INCONSISTENT_PARAMS = "408";
  string public constant LP_NFT_IS_NOT_USED_AS_COLLATERAL = "409";
  string public constant LP_CALLER_MUST_BE_AN_BTOKEN = "410";
  string public constant LP_INVALIED_NFT_AMOUNT = "411";
  string public constant LP_NFT_HAS_USED_AS_COLLATERAL = "412";
  string public constant LP_DELEGATE_CALL_FAILED = "413";
  string public constant LP_AMOUNT_LESS_THAN_EXTRA_DEBT = "414";
  string public constant LP_AMOUNT_LESS_THAN_REDEEM_THRESHOLD = "415";
  //lend pool loan errors
  string public constant LPL_INVALID_LOAN_STATE = "480";
  string public constant LPL_INVALID_LOAN_AMOUNT = "481";
  string public constant LPL_INVALID_TAKEN_AMOUNT = "482";
  string public constant LPL_AMOUNT_OVERFLOW = "483";
  string public constant LPL_BID_PRICE_LESS_THAN_LIQUIDATION_PRICE = "484";
  string public constant LPL_BID_PRICE_LESS_THAN_HIGHEST_PRICE = "485";
  string public constant LPL_BID_REDEEM_DURATION_HAS_END = "486";
  string public constant LPL_BID_USER_NOT_SAME = "487";
  string public constant LPL_BID_REPAY_AMOUNT_NOT_ENOUGH = "488";
  string public constant LPL_BID_AUCTION_DURATION_HAS_END = "489";
  string public constant LPL_BID_AUCTION_DURATION_NOT_END = "490";
  string public constant LPL_BID_PRICE_LESS_THAN_BORROW = "491";
  string public constant LPL_INVALID_BIDDER_ADDRESS = "492";
  string public constant LPL_AMOUNT_LESS_THAN_BID_FINE = "493";
  //common token errors
  string public constant CT_CALLER_MUST_BE_LEND_POOL = "500"; // 'The caller of this function must be a lending pool'
  string public constant CT_INVALID_MINT_AMOUNT = "501"; //invalid amount to mint
  string public constant CT_INVALID_BURN_AMOUNT = "502"; //invalid amount to burn
  //reserve logic errors
  string public constant RL_RESERVE_ALREADY_INITIALIZED = "601"; // 'Reserve has already been initialized'
  string public constant RL_LIQUIDITY_INDEX_OVERFLOW = "602"; //  Liquidity index overflows uint128
  string public constant RL_VARIABLE_BORROW_INDEX_OVERFLOW = "603"; //  Variable borrow index overflows uint128
  string public constant RL_LIQUIDITY_RATE_OVERFLOW = "604"; //  Liquidity rate overflows uint128
  string public constant RL_VARIABLE_BORROW_RATE_OVERFLOW = "605"; //  Variable borrow rate overflows uint128
  //configure errors
  string public constant LPC_RESERVE_LIQUIDITY_NOT_0 = "700"; // 'The liquidity of the reserve needs to be 0'
  string public constant LPC_INVALID_CONFIGURATION = "701"; // 'Invalid risk parameters for the reserve'
  string public constant LPC_CALLER_NOT_EMERGENCY_ADMIN = "702"; // 'The caller must be the emergency admin'
  string public constant LPC_INVALIED_BNFT_ADDRESS = "703";
  string public constant LPC_INVALIED_LOAN_ADDRESS = "704";
  string public constant LPC_NFT_LIQUIDITY_NOT_0 = "705";
  //reserve config errors
  string public constant RC_INVALID_LTV = "730";
  string public constant RC_INVALID_LIQ_THRESHOLD = "731";
  string public constant RC_INVALID_LIQ_BONUS = "732";
  string public constant RC_INVALID_DECIMALS = "733";
  string public constant RC_INVALID_RESERVE_FACTOR = "734";
  string public constant RC_INVALID_REDEEM_DURATION = "735";
  string public constant RC_INVALID_AUCTION_DURATION = "736";
  string public constant RC_INVALID_REDEEM_FINE = "737";
  string public constant RC_INVALID_REDEEM_THRESHOLD = "738";
  //address provider erros
  string public constant LPAPR_PROVIDER_NOT_REGISTERED = "760"; // 'Provider is not registered'
  string public constant LPAPR_INVALID_ADDRESSES_PROVIDER_ID = "761";
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/ERC1967/ERC1967Proxy.sol)
pragma solidity ^0.8.0;
import "../Proxy.sol";
import "./ERC1967Upgrade.sol";
/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 */
contract ERC1967Proxy is Proxy, ERC1967Upgrade {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     *
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _upgradeToAndCall(_logic, _data, false);
    }
    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal view virtual override returns (address impl) {
        return ERC1967Upgrade._getImplementation();
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/Proxy.sol)
pragma solidity ^0.8.0;
/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())
            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())
            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }
    /**
     * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);
    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback() external payable virtual {
        _fallback();
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive() external payable virtual {
        _fallback();
    }
    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/ERC1967/ERC1967Upgrade.sol)
pragma solidity ^0.8.2;
import "../beacon/IBeacon.sol";
import "../../utils/Address.sol";
import "../../utils/StorageSlot.sol";
/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 *
 * @custom:oz-upgrades-unsafe-allow delegatecall
 */
abstract contract ERC1967Upgrade {
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);
    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }
    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }
    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
    }
    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallSecure(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        address oldImplementation = _getImplementation();
        // Initial upgrade and setup call
        _setImplementation(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
        // Perform rollback test if not already in progress
        StorageSlot.BooleanSlot storage rollbackTesting = StorageSlot.getBooleanSlot(_ROLLBACK_SLOT);
        if (!rollbackTesting.value) {
            // Trigger rollback using upgradeTo from the new implementation
            rollbackTesting.value = true;
            Address.functionDelegateCall(
                newImplementation,
                abi.encodeWithSignature("upgradeTo(address)", oldImplementation)
            );
            rollbackTesting.value = false;
            // Check rollback was effective
            require(oldImplementation == _getImplementation(), "ERC1967Upgrade: upgrade breaks further upgrades");
            // Finally reset to the new implementation and log the upgrade
            _upgradeTo(newImplementation);
        }
    }
    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);
    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlot.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }
    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;
    /**
     * @dev Emitted when the beacon is upgraded.
     */
    event BeaconUpgraded(address indexed beacon);
    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(_BEACON_SLOT).value;
    }
    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(Address.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            Address.isContract(IBeacon(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlot.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }
    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(
        address newBeacon,
        bytes memory data,
        bool forceCall
    ) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)
pragma solidity ^0.8.0;
/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)
pragma solidity ^0.8.0;
/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/StorageSlot.sol)
pragma solidity ^0.8.0;
/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }
    struct BooleanSlot {
        bool value;
    }
    struct Bytes32Slot {
        bytes32 value;
    }
    struct Uint256Slot {
        uint256 value;
    }
    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IBNFT} from "../interfaces/IBNFT.sol";
import {IBNFTRegistry} from "../interfaces/IBNFTRegistry.sol";
import {ILendPoolLoan} from "../interfaces/ILendPoolLoan.sol";
import {ILendPool} from "../interfaces/ILendPool.sol";
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
import {ILoanRepaidInterceptor} from "../interfaces/ILoanRepaidInterceptor.sol";
import {Errors} from "../libraries/helpers/Errors.sol";
import {DataTypes} from "../libraries/types/DataTypes.sol";
import {WadRayMath} from "../libraries/math/WadRayMath.sol";
import {IERC721Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
import {IERC721ReceiverUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721ReceiverUpgradeable.sol";
import {CountersUpgradeable} from "@openzeppelin/contracts-upgradeable/utils/CountersUpgradeable.sol";
import {Initializable} from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import {ContextUpgradeable} from "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";
contract LendPoolLoan is Initializable, ILendPoolLoan, ContextUpgradeable, IERC721ReceiverUpgradeable {
  using WadRayMath for uint256;
  using CountersUpgradeable for CountersUpgradeable.Counter;
  ILendPoolAddressesProvider private _addressesProvider;
  CountersUpgradeable.Counter private _loanIdTracker;
  mapping(uint256 => DataTypes.LoanData) private _loans;
  // nftAsset + nftTokenId => loanId
  mapping(address => mapping(uint256 => uint256)) private _nftToLoanIds;
  mapping(address => uint256) private _nftTotalCollateral;
  mapping(address => mapping(address => uint256)) private _userNftCollateral;
  // interceptor whitelist
  mapping(address => bool) private _loanRepaidInterceptorWhitelist;
  // Mapping from token to approved burn interceptor addresses
  mapping(address => mapping(uint256 => address[])) private _loanRepaidInterceptors;
  // locker whitelist
  mapping(address => bool) private _flashLoanLockerWhitelist;
  /**
   * @dev Only lending pool can call functions marked by this modifier
   **/
  modifier onlyLendPool() {
    require(_msgSender() == address(_getLendPool()), Errors.CT_CALLER_MUST_BE_LEND_POOL);
    _;
  }
  modifier onlyLendPoolConfigurator() {
    require(_msgSender() == _addressesProvider.getLendPoolConfigurator(), Errors.LP_CALLER_NOT_LEND_POOL_CONFIGURATOR);
    _;
  }
  modifier onlyLoanRepaidInterceptor() {
    require(_loanRepaidInterceptorWhitelist[_msgSender()], Errors.LP_CALLER_NOT_VALID_INTERCEPTOR);
    _;
  }
  modifier onlyFlashLoanLocker() {
    require(_flashLoanLockerWhitelist[_msgSender()], Errors.LP_CALLER_NOT_VALID_LOCKER);
    _;
  }
  // called once by the factory at time of deployment
  function initialize(ILendPoolAddressesProvider provider) external initializer {
    __Context_init();
    _addressesProvider = provider;
    // Avoid having loanId = 0
    _loanIdTracker.increment();
    emit Initialized(address(_getLendPool()));
  }
  function initNft(address nftAsset, address bNftAddress) external override onlyLendPool {
    IERC721Upgradeable(nftAsset).setApprovalForAll(bNftAddress, true);
  }
  /**
   * @inheritdoc ILendPoolLoan
   */
  function createLoan(
    address initiator,
    address onBehalfOf,
    address nftAsset,
    uint256 nftTokenId,
    address bNftAddress,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  ) external override onlyLendPool returns (uint256) {
    require(_nftToLoanIds[nftAsset][nftTokenId] == 0, Errors.LP_NFT_HAS_USED_AS_COLLATERAL);
    // index is expressed in Ray, so:
    // amount.wadToRay().rayDiv(index).rayToWad() => amount.rayDiv(index)
    uint256 amountScaled = amount.rayDiv(borrowIndex);
    uint256 loanId = _loanIdTracker.current();
    _loanIdTracker.increment();
    _nftToLoanIds[nftAsset][nftTokenId] = loanId;
    // transfer underlying NFT asset to pool and mint bNFT to onBehalfOf
    IERC721Upgradeable(nftAsset).safeTransferFrom(_msgSender(), address(this), nftTokenId);
    IBNFT(bNftAddress).mint(onBehalfOf, nftTokenId);
    // Save Info
    DataTypes.LoanData storage loanData = _loans[loanId];
    loanData.loanId = loanId;
    loanData.state = DataTypes.LoanState.Active;
    loanData.borrower = onBehalfOf;
    loanData.nftAsset = nftAsset;
    loanData.nftTokenId = nftTokenId;
    loanData.reserveAsset = reserveAsset;
    loanData.scaledAmount = amountScaled;
    _userNftCollateral[onBehalfOf][nftAsset] += 1;
    _nftTotalCollateral[nftAsset] += 1;
    emit LoanCreated(initiator, onBehalfOf, loanId, nftAsset, nftTokenId, reserveAsset, amount, borrowIndex);
    return (loanId);
  }
  /**
   * @inheritdoc ILendPoolLoan
   */
  function updateLoan(
    address initiator,
    uint256 loanId,
    uint256 amountAdded,
    uint256 amountTaken,
    uint256 borrowIndex
  ) external override onlyLendPool {
    // Must use storage to change state
    DataTypes.LoanData storage loan = _loans[loanId];
    // Ensure valid loan state
    require(loan.state == DataTypes.LoanState.Active, Errors.LPL_INVALID_LOAN_STATE);
    uint256 amountScaled = 0;
    if (amountAdded > 0) {
      amountScaled = amountAdded.rayDiv(borrowIndex);
      require(amountScaled != 0, Errors.LPL_INVALID_LOAN_AMOUNT);
      loan.scaledAmount += amountScaled;
    }
    if (amountTaken > 0) {
      amountScaled = amountTaken.rayDiv(borrowIndex);
      require(amountScaled != 0, Errors.LPL_INVALID_TAKEN_AMOUNT);
      require(loan.scaledAmount >= amountScaled, Errors.LPL_AMOUNT_OVERFLOW);
      loan.scaledAmount -= amountScaled;
    }
    emit LoanUpdated(
      initiator,
      loanId,
      loan.nftAsset,
      loan.nftTokenId,
      loan.reserveAsset,
      amountAdded,
      amountTaken,
      borrowIndex
    );
  }
  /**
   * @inheritdoc ILendPoolLoan
   */
  function repayLoan(
    address initiator,
    uint256 loanId,
    address bNftAddress,
    uint256 amount,
    uint256 borrowIndex
  ) external override onlyLendPool {
    // Must use storage to change state
    DataTypes.LoanData storage loan = _loans[loanId];
    // Ensure valid loan state
    require(loan.state == DataTypes.LoanState.Active, Errors.LPL_INVALID_LOAN_STATE);
    _handleBeforeLoanRepaid(loan.nftAsset, loan.nftTokenId);
    // state changes and cleanup
    // NOTE: these must be performed before assets are released to prevent reentrance
    _loans[loanId].state = DataTypes.LoanState.Repaid;
    _nftToLoanIds[loan.nftAsset][loan.nftTokenId] = 0;
    require(_userNftCollateral[loan.borrower][loan.nftAsset] >= 1, Errors.LP_INVALIED_USER_NFT_AMOUNT);
    _userNftCollateral[loan.borrower][loan.nftAsset] -= 1;
    require(_nftTotalCollateral[loan.nftAsset] >= 1, Errors.LP_INVALIED_NFT_AMOUNT);
    _nftTotalCollateral[loan.nftAsset] -= 1;
    // burn bNFT and transfer underlying NFT asset to user
    IBNFT(bNftAddress).burn(loan.nftTokenId);
    IERC721Upgradeable(loan.nftAsset).safeTransferFrom(address(this), _msgSender(), loan.nftTokenId);
    emit LoanRepaid(initiator, loanId, loan.nftAsset, loan.nftTokenId, loan.reserveAsset, amount, borrowIndex);
    _handleAfterLoanRepaid(loan.nftAsset, loan.nftTokenId);
  }
  /**
   * @inheritdoc ILendPoolLoan
   */
  function auctionLoan(
    address initiator,
    uint256 loanId,
    address onBehalfOf,
    uint256 bidPrice,
    uint256 borrowAmount,
    uint256 borrowIndex
  ) external override onlyLendPool {
    // Must use storage to change state
    DataTypes.LoanData storage loan = _loans[loanId];
    address previousBidder = loan.bidderAddress;
    uint256 previousPrice = loan.bidPrice;
    // Ensure valid loan state
    if (loan.bidStartTimestamp == 0) {
      require(loan.state == DataTypes.LoanState.Active, Errors.LPL_INVALID_LOAN_STATE);
      loan.state = DataTypes.LoanState.Auction;
      loan.bidStartTimestamp = block.timestamp;
      loan.firstBidderAddress = onBehalfOf;
    } else {
      require(loan.state == DataTypes.LoanState.Auction, Errors.LPL_INVALID_LOAN_STATE);
      require(bidPrice > loan.bidPrice, Errors.LPL_BID_PRICE_LESS_THAN_HIGHEST_PRICE);
    }
    loan.bidBorrowAmount = borrowAmount;
    loan.bidderAddress = onBehalfOf;
    loan.bidPrice = bidPrice;
    emit LoanAuctioned(
      initiator,
      loanId,
      loan.nftAsset,
      loan.nftTokenId,
      loan.bidBorrowAmount,
      borrowIndex,
      onBehalfOf,
      bidPrice,
      previousBidder,
      previousPrice
    );
  }
  /**
   * @inheritdoc ILendPoolLoan
   */
  function redeemLoan(
    address initiator,
    uint256 loanId,
    uint256 amountTaken,
    uint256 borrowIndex
  ) external override onlyLendPool {
    // Must use storage to change state
    DataTypes.LoanData storage loan = _loans[loanId];
    // Ensure valid loan state
    require(loan.state == DataTypes.LoanState.Auction, Errors.LPL_INVALID_LOAN_STATE);
    uint256 amountScaled = amountTaken.rayDiv(borrowIndex);
    require(amountScaled != 0, Errors.LPL_INVALID_TAKEN_AMOUNT);
    require(loan.scaledAmount >= amountScaled, Errors.LPL_AMOUNT_OVERFLOW);
    loan.scaledAmount -= amountScaled;
    loan.state = DataTypes.LoanState.Active;
    loan.bidStartTimestamp = 0;
    loan.bidBorrowAmount = 0;
    loan.bidderAddress = address(0);
    loan.bidPrice = 0;
    loan.firstBidderAddress = address(0);
    emit LoanRedeemed(initiator, loanId, loan.nftAsset, loan.nftTokenId, loan.reserveAsset, amountTaken, borrowIndex);
  }
  /**
   * @inheritdoc ILendPoolLoan
   */
  function liquidateLoan(
    address initiator,
    uint256 loanId,
    address bNftAddress,
    uint256 borrowAmount,
    uint256 borrowIndex
  ) external override onlyLendPool {
    // Must use storage to change state
    DataTypes.LoanData storage loan = _loans[loanId];
    // Ensure valid loan state
    require(loan.state == DataTypes.LoanState.Auction, Errors.LPL_INVALID_LOAN_STATE);
    _handleBeforeLoanRepaid(loan.nftAsset, loan.nftTokenId);
    // state changes and cleanup
    // NOTE: these must be performed before assets are released to prevent reentrance
    _loans[loanId].state = DataTypes.LoanState.Defaulted;
    _loans[loanId].bidBorrowAmount = borrowAmount;
    _nftToLoanIds[loan.nftAsset][loan.nftTokenId] = 0;
    require(_userNftCollateral[loan.borrower][loan.nftAsset] >= 1, Errors.LP_INVALIED_USER_NFT_AMOUNT);
    _userNftCollateral[loan.borrower][loan.nftAsset] -= 1;
    require(_nftTotalCollateral[loan.nftAsset] >= 1, Errors.LP_INVALIED_NFT_AMOUNT);
    _nftTotalCollateral[loan.nftAsset] -= 1;
    // burn bNFT and transfer underlying NFT asset to user
    IBNFT(bNftAddress).burn(loan.nftTokenId);
    IERC721Upgradeable(loan.nftAsset).safeTransferFrom(address(this), _msgSender(), loan.nftTokenId);
    emit LoanLiquidated(
      initiator,
      loanId,
      loan.nftAsset,
      loan.nftTokenId,
      loan.reserveAsset,
      borrowAmount,
      borrowIndex
    );
    _handleAfterLoanRepaid(loan.nftAsset, loan.nftTokenId);
  }
  function approveLoanRepaidInterceptor(address interceptor, bool approved) public override onlyLendPoolConfigurator {
    _loanRepaidInterceptorWhitelist[interceptor] = approved;
  }
  function isLoanRepaidInterceptorApproved(address interceptor) public view override returns (bool) {
    return _loanRepaidInterceptorWhitelist[interceptor];
  }
  function purgeLoanRepaidInterceptor(
    address nftAsset,
    uint256[] calldata tokenIds,
    address interceptor
  ) public override onlyLendPoolConfigurator {
    for (uint256 i = 0; i < tokenIds.length; i++) {
      address[] storage interceptors = _loanRepaidInterceptors[nftAsset][tokenIds[i]];
      for (uint256 findIndex = 0; findIndex < interceptors.length; findIndex++) {
        if (interceptors[findIndex] == interceptor) {
          _deleteLoanRepaidInterceptor(nftAsset, tokenIds[i], findIndex);
          break;
        }
      }
    }
  }
  function addLoanRepaidInterceptor(address nftAsset, uint256 tokenId) public override onlyLoanRepaidInterceptor {
    address interceptor = _msgSender();
    address[] storage interceptors = _loanRepaidInterceptors[nftAsset][tokenId];
    for (uint256 i = 0; i < interceptors.length; i++) {
      if (interceptors[i] == interceptor) {
        return;
      }
    }
    interceptors.push(interceptor);
    emit LoanRepaidInterceptorUpdated(nftAsset, tokenId, interceptor, true);
  }
  function deleteLoanRepaidInterceptor(address nftAsset, uint256 tokenId) public override onlyLoanRepaidInterceptor {
    address interceptor = _msgSender();
    address[] storage interceptors = _loanRepaidInterceptors[nftAsset][tokenId];
    bool isFind = false;
    uint256 findIndex = 0;
    for (; findIndex < interceptors.length; findIndex++) {
      if (interceptors[findIndex] == interceptor) {
        isFind = true;
        break;
      }
    }
    if (isFind) {
      _deleteLoanRepaidInterceptor(nftAsset, tokenId, findIndex);
    }
  }
  function getLoanRepaidInterceptors(address nftAsset, uint256 tokenId)
    public
    view
    override
    returns (address[] memory)
  {
    return _loanRepaidInterceptors[nftAsset][tokenId];
  }
  function approveFlashLoanLocker(address locker, bool approved) public override onlyLendPoolConfigurator {
    _flashLoanLockerWhitelist[locker] = approved;
  }
  function isFlashLoanLockerApproved(address locker) public view override returns (bool) {
    return _flashLoanLockerWhitelist[locker];
  }
  function setFlashLoanLocking(
    address nftAsset,
    uint256 tokenId,
    bool locked
  ) public override onlyFlashLoanLocker {
    (address bnftProxy, ) = IBNFTRegistry(_addressesProvider.getBNFTRegistry()).getBNFTAddresses(nftAsset);
    IBNFT(bnftProxy).setFlashLoanLocking(tokenId, _msgSender(), locked);
  }
  function purgeFlashLoanLocking(
    address nftAsset,
    uint256[] calldata tokenIds,
    address locker
  ) public override onlyLendPoolConfigurator {
    (address bnftProxy, ) = IBNFTRegistry(_addressesProvider.getBNFTRegistry()).getBNFTAddresses(nftAsset);
    for (uint256 i = 0; i < tokenIds.length; i++) {
      IBNFT(bnftProxy).setFlashLoanLocking(tokenIds[i], locker, false);
    }
  }
  function onERC721Received(
    address operator,
    address from,
    uint256 tokenId,
    bytes calldata data
  ) external pure override returns (bytes4) {
    operator;
    from;
    tokenId;
    data;
    return IERC721ReceiverUpgradeable.onERC721Received.selector;
  }
  function borrowerOf(uint256 loanId) external view override returns (address) {
    return _loans[loanId].borrower;
  }
  function getCollateralLoanId(address nftAsset, uint256 nftTokenId) external view override returns (uint256) {
    return _nftToLoanIds[nftAsset][nftTokenId];
  }
  function getLoan(uint256 loanId) external view override returns (DataTypes.LoanData memory loanData) {
    return _loans[loanId];
  }
  function getLoanCollateralAndReserve(uint256 loanId)
    external
    view
    override
    returns (
      address nftAsset,
      uint256 nftTokenId,
      address reserveAsset,
      uint256 scaledAmount
    )
  {
    return (
      _loans[loanId].nftAsset,
      _loans[loanId].nftTokenId,
      _loans[loanId].reserveAsset,
      _loans[loanId].scaledAmount
    );
  }
  function getLoanReserveBorrowAmount(uint256 loanId) external view override returns (address, uint256) {
    uint256 scaledAmount = _loans[loanId].scaledAmount;
    if (scaledAmount == 0) {
      return (_loans[loanId].reserveAsset, 0);
    }
    uint256 amount = scaledAmount.rayMul(_getLendPool().getReserveNormalizedVariableDebt(_loans[loanId].reserveAsset));
    return (_loans[loanId].reserveAsset, amount);
  }
  function getLoanReserveBorrowScaledAmount(uint256 loanId) external view override returns (address, uint256) {
    return (_loans[loanId].reserveAsset, _loans[loanId].scaledAmount);
  }
  function getLoanHighestBid(uint256 loanId) external view override returns (address, uint256) {
    return (_loans[loanId].bidderAddress, _loans[loanId].bidPrice);
  }
  function getNftCollateralAmount(address nftAsset) external view override returns (uint256) {
    return _nftTotalCollateral[nftAsset];
  }
  function getUserNftCollateralAmount(address user, address nftAsset) external view override returns (uint256) {
    return _userNftCollateral[user][nftAsset];
  }
  function getCurrentLoanId() public view returns (uint256) {
    return _loanIdTracker.current();
  }
  function _getLendPool() internal view returns (ILendPool) {
    return ILendPool(_addressesProvider.getLendPool());
  }
  function _deleteLoanRepaidInterceptor(
    address nftAsset,
    uint256 tokenId,
    uint256 findIndex
  ) internal {
    address[] storage interceptors = _loanRepaidInterceptors[nftAsset][tokenId];
    address findInterceptor = interceptors[findIndex];
    uint256 lastInterceptorIndex = interceptors.length - 1;
    // When the token to delete is the last item, the swap operation is unnecessary.
    // Move the last interceptor to the slot of the to-delete interceptor
    if (findIndex < lastInterceptorIndex) {
      address lastInterceptorAddr = interceptors[lastInterceptorIndex];
      interceptors[findIndex] = lastInterceptorAddr;
    }
    interceptors.pop();
    emit LoanRepaidInterceptorUpdated(nftAsset, tokenId, findInterceptor, false);
  }
  function _handleBeforeLoanRepaid(address nftAsset, uint256 tokenId) internal {
    // CAUTION: interceptor maybe deleted in the called function
    address[] memory interceptors = getLoanRepaidInterceptors(nftAsset, tokenId);
    for (uint256 i = 0; i < interceptors.length; i++) {
      bool checkHandle = ILoanRepaidInterceptor(interceptors[i]).beforeLoanRepaid(nftAsset, tokenId);
      require(checkHandle, "BNFT: call interceptor before token burn failed");
    }
  }
  function _handleAfterLoanRepaid(address nftAsset, uint256 tokenId) internal {
    // CAUTION: interceptor maybe deleted in the called function
    address[] memory interceptors = getLoanRepaidInterceptors(nftAsset, tokenId);
    for (uint256 i = 0; i < interceptors.length; i++) {
      bool checkHandle = ILoanRepaidInterceptor(interceptors[i]).afterLoanRepaid(nftAsset, tokenId);
      require(checkHandle, "BNFT: call interceptor after token burn failed");
    }
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
interface IBNFT {
  /**
   * @dev Emitted when an bNFT is initialized
   * @param underlyingAsset_ The address of the underlying asset
   **/
  event Initialized(address indexed underlyingAsset_);
  /**
   * @dev Emitted when the ownership is transferred
   * @param oldOwner The address of the old owner
   * @param newOwner The address of the new owner
   **/
  event OwnershipTransferred(address oldOwner, address newOwner);
  /**
   * @dev Emitted when the claim admin is updated
   * @param oldAdmin The address of the old admin
   * @param newAdmin The address of the new admin
   **/
  event ClaimAdminUpdated(address oldAdmin, address newAdmin);
  /**
   * @dev Emitted on mint
   * @param user The address initiating the burn
   * @param nftAsset address of the underlying asset of NFT
   * @param nftTokenId token id of the underlying asset of NFT
   * @param owner The owner address receive the bNFT token
   **/
  event Mint(address indexed user, address indexed nftAsset, uint256 nftTokenId, address indexed owner);
  /**
   * @dev Emitted on burn
   * @param user The address initiating the burn
   * @param nftAsset address of the underlying asset of NFT
   * @param nftTokenId token id of the underlying asset of NFT
   * @param owner The owner address of the burned bNFT token
   **/
  event Burn(address indexed user, address indexed nftAsset, uint256 nftTokenId, address indexed owner);
  /**
   * @dev Emitted on flashLoan
   * @param target The address of the flash loan receiver contract
   * @param initiator The address initiating the flash loan
   * @param nftAsset address of the underlying asset of NFT
   * @param tokenId The token id of the asset being flash borrowed
   **/
  event FlashLoan(address indexed target, address indexed initiator, address indexed nftAsset, uint256 tokenId);
  event ClaimERC20Airdrop(address indexed token, address indexed to, uint256 amount);
  event ClaimERC721Airdrop(address indexed token, address indexed to, uint256[] ids);
  event ClaimERC1155Airdrop(address indexed token, address indexed to, uint256[] ids, uint256[] amounts, bytes data);
  event ExecuteAirdrop(address indexed airdropContract);
  event FlashLoanApproval(address indexed minter, address indexed operator, bool approved);
  event FlashLoanLocking(uint256 tokenId, address indexed minter, address indexed operator, bool approved);
  /**
   * @dev Initializes the bNFT
   * @param underlyingAsset_ The address of the underlying asset of this bNFT (E.g. PUNK for bPUNK)
   */
  function initialize(
    address underlyingAsset_,
    string calldata bNftName,
    string calldata bNftSymbol,
    address owner_,
    address claimAdmin_
  ) external;
  /**
   * @dev Mints bNFT token to the user address
   *
   * Requirements:
   *  - The caller can be contract address and EOA.
   *  - `nftTokenId` must not exist.
   *
   * @param to The owner address receive the bNFT token
   * @param tokenId token id of the underlying asset of NFT
   **/
  function mint(address to, uint256 tokenId) external;
  /**
   * @dev Burns user bNFT token
   *
   * Requirements:
   *  - The caller can be contract address and EOA.
   *  - `tokenId` must exist.
   *
   * @param tokenId token id of the underlying asset of NFT
   **/
  function burn(uint256 tokenId) external;
  /**
   * @dev Allows smartcontracts to access the tokens within one transaction, as long as the tokens taken is returned.
   *
   * Requirements:
   *  - `nftTokenIds` must exist.
   *
   * @param receiverAddress The address of the contract receiving the tokens, implementing the IFlashLoanReceiver interface
   * @param nftTokenIds token ids of the underlying asset
   * @param params Variadic packed params to pass to the receiver as extra information
   */
  function flashLoan(
    address receiverAddress,
    uint256[] calldata nftTokenIds,
    bytes calldata params
  ) external;
  /**
   * @dev Approve or remove the flash loan `operator` as an operator for the minter.
   * Operators can call {flashLoan} for any token minted by the minter.
   *
   */
  function setFlashLoanApproval(address operator, bool approved) external;
  /**
   * @dev Returns if the `operator` is allowed to call flash loan of the assets of `minter`.
   */
  function isFlashLoanApproved(address minter, address operator) external view returns (bool);
  /**
   * @dev Lock or unlock the flash loan `operator` as an operator for the minter.
   * Operators can call {flashLoan} for any token minted by the minter.
   *
   */
  function setFlashLoanLocking(
    uint256 tokenId,
    address operator,
    bool locked
  ) external;
  /**
   * @dev Returns if the `operator` is allowed to call flash loan of the assets of `minter`.
   */
  function isFlashLoanLocked(
    uint256 tokenId,
    address minter,
    address operator
  ) external view returns (bool);
  function getFlashLoanLocked(uint256 tokenId, address minter) external view returns (address[] memory);
  function claimERC20Airdrop(
    address token,
    address to,
    uint256 amount
  ) external;
  function claimERC721Airdrop(
    address token,
    address to,
    uint256[] calldata ids
  ) external;
  function claimERC1155Airdrop(
    address token,
    address to,
    uint256[] calldata ids,
    uint256[] calldata amounts,
    bytes calldata data
  ) external;
  function executeAirdrop(address airdropContract, bytes calldata airdropParams) external;
  /**
   * @dev Returns the owner of the `nftTokenId` token.
   *
   * Requirements:
   *  - `tokenId` must exist.
   *
   * @param tokenId token id of the underlying asset of NFT
   */
  function minterOf(uint256 tokenId) external view returns (address);
  /**
   * @dev Returns the address of the underlying asset.
   */
  function underlyingAsset() external view returns (address);
  /**
   * @dev Returns the contract-level metadata.
   */
  function contractURI() external view returns (string memory);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
interface IBNFTRegistry {
  event Initialized(address genericImpl, string namePrefix, string symbolPrefix);
  event GenericImplementationUpdated(address genericImpl);
  event BNFTCreated(address indexed nftAsset, address bNftImpl, address bNftProxy, uint256 totals);
  event BNFTUpgraded(address indexed nftAsset, address bNftImpl, address bNftProxy, uint256 totals);
  event CustomeSymbolsAdded(address[] nftAssets, string[] symbols);
  event ClaimAdminUpdated(address oldAdmin, address newAdmin);
  function getBNFTAddresses(address nftAsset) external view returns (address bNftProxy, address bNftImpl);
  function getBNFTAddressesByIndex(uint16 index) external view returns (address bNftProxy, address bNftImpl);
  function getBNFTAssetList() external view returns (address[] memory);
  function allBNFTAssetLength() external view returns (uint256);
  function initialize(
    address genericImpl,
    string memory namePrefix_,
    string memory symbolPrefix_
  ) external;
  function setBNFTGenericImpl(address genericImpl) external;
  /**
   * @dev Create bNFT proxy and implement, then initialize it
   * @param nftAsset The address of the underlying asset of the BNFT
   **/
  function createBNFT(address nftAsset) external returns (address bNftProxy);
  /**
   * @dev Create bNFT proxy with already deployed implement, then initialize it
   * @param nftAsset The address of the underlying asset of the BNFT
   * @param bNftImpl The address of the deployed implement of the BNFT
   **/
  function createBNFTWithImpl(address nftAsset, address bNftImpl) external returns (address bNftProxy);
  /**
   * @dev Update bNFT proxy to an new deployed implement, then initialize it
   * @param nftAsset The address of the underlying asset of the BNFT
   * @param bNftImpl The address of the deployed implement of the BNFT
   * @param encodedCallData The encoded function call.
   **/
  function upgradeBNFTWithImpl(
    address nftAsset,
    address bNftImpl,
    bytes memory encodedCallData
  ) external;
  function batchUpgradeBNFT(address[] calldata nftAssets) external;
  function batchUpgradeAllBNFT() external;
  /**
   * @dev Adding custom symbol for some special NFTs like CryptoPunks
   * @param nftAssets_ The addresses of the NFTs
   * @param symbols_ The custom symbols of the NFTs
   **/
  function addCustomeSymbols(address[] memory nftAssets_, string[] memory symbols_) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {DataTypes} from "../libraries/types/DataTypes.sol";
interface ILendPoolLoan {
  /**
   * @dev Emitted on initialization to share location of dependent notes
   * @param pool The address of the associated lend pool
   */
  event Initialized(address indexed pool);
  /**
   * @dev Emitted when a loan is created
   * @param user The address initiating the action
   */
  event LoanCreated(
    address indexed user,
    address indexed onBehalfOf,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  );
  /**
   * @dev Emitted when a loan is updated
   * @param user The address initiating the action
   */
  event LoanUpdated(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amountAdded,
    uint256 amountTaken,
    uint256 borrowIndex
  );
  /**
   * @dev Emitted when a loan is repaid by the borrower
   * @param user The address initiating the action
   */
  event LoanRepaid(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  );
  /**
   * @dev Emitted when a loan is auction by the liquidator
   * @param user The address initiating the action
   */
  event LoanAuctioned(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount,
    uint256 borrowIndex,
    address bidder,
    uint256 price,
    address previousBidder,
    uint256 previousPrice
  );
  /**
   * @dev Emitted when a loan is redeemed
   * @param user The address initiating the action
   */
  event LoanRedeemed(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amountTaken,
    uint256 borrowIndex
  );
  /**
   * @dev Emitted when a loan is liquidate by the liquidator
   * @param user The address initiating the action
   */
  event LoanLiquidated(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  );
  event LoanRepaidInterceptorUpdated(address nftAsset, uint256 tokenId, address indexed interceptor, bool approved);
  function initNft(address nftAsset, address bNftAddress) external;
  /**
   * @dev Create store a loan object with some params
   * @param initiator The address of the user initiating the borrow
   * @param onBehalfOf The address receiving the loan
   */
  function createLoan(
    address initiator,
    address onBehalfOf,
    address nftAsset,
    uint256 nftTokenId,
    address bNftAddress,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  ) external returns (uint256);
  /**
   * @dev Update the given loan with some params
   *
   * Requirements:
   *  - The caller must be a holder of the loan
   *  - The loan must be in state Active
   * @param initiator The address of the user initiating the borrow
   */
  function updateLoan(
    address initiator,
    uint256 loanId,
    uint256 amountAdded,
    uint256 amountTaken,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Repay the given loan
   *
   * Requirements:
   *  - The caller must be a holder of the loan
   *  - The caller must send in principal + interest
   *  - The loan must be in state Active
   *
   * @param initiator The address of the user initiating the repay
   * @param loanId The loan getting burned
   * @param bNftAddress The address of bNFT
   */
  function repayLoan(
    address initiator,
    uint256 loanId,
    address bNftAddress,
    uint256 amount,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Auction the given loan
   *
   * Requirements:
   *  - The price must be greater than current highest price
   *  - The loan must be in state Active or Auction
   *
   * @param initiator The address of the user initiating the auction
   * @param loanId The loan getting auctioned
   * @param bidPrice The bid price of this auction
   */
  function auctionLoan(
    address initiator,
    uint256 loanId,
    address onBehalfOf,
    uint256 bidPrice,
    uint256 borrowAmount,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Redeem the given loan with some params
   *
   * Requirements:
   *  - The caller must be a holder of the loan
   *  - The loan must be in state Auction
   * @param initiator The address of the user initiating the borrow
   */
  function redeemLoan(
    address initiator,
    uint256 loanId,
    uint256 amountTaken,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Liquidate the given loan
   *
   * Requirements:
   *  - The caller must send in principal + interest
   *  - The loan must be in state Active
   *
   * @param initiator The address of the user initiating the auction
   * @param loanId The loan getting burned
   * @param bNftAddress The address of bNFT
   */
  function liquidateLoan(
    address initiator,
    uint256 loanId,
    address bNftAddress,
    uint256 borrowAmount,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Add or remove the interceptor from the whitelist
   * @param interceptor The address of the interceptor contract
   * @param approved add or remove
   */
  function approveLoanRepaidInterceptor(address interceptor, bool approved) external;
  function isLoanRepaidInterceptorApproved(address interceptor) external view returns (bool);
  function purgeLoanRepaidInterceptor(
    address nftAddress,
    uint256[] calldata tokenIds,
    address interceptor
  ) external;
  function addLoanRepaidInterceptor(address nftAsset, uint256 tokenId) external;
  function deleteLoanRepaidInterceptor(address nftAsset, uint256 tokenId) external;
  function getLoanRepaidInterceptors(address nftAsset, uint256 tokenId) external view returns (address[] memory);
  /**
   * @dev Add or remove the locker from the whitelist
   * @param locker The address of the locker contract
   * @param approved add or remove
   */
  function approveFlashLoanLocker(address locker, bool approved) external;
  function isFlashLoanLockerApproved(address locker) external view returns (bool);
  /**
   * @dev Lock or unlock the flash loan caller
   * @param nftAsset The address of the NFT asset
   * @param tokenId The id of the NFT token
   * @param locked lock or unlock
   */
  function setFlashLoanLocking(
    address nftAsset,
    uint256 tokenId,
    bool locked
  ) external;
  function purgeFlashLoanLocking(
    address nftAsset,
    uint256[] calldata tokenIds,
    address locker
  ) external;
  function borrowerOf(uint256 loanId) external view returns (address);
  function getCollateralLoanId(address nftAsset, uint256 nftTokenId) external view returns (uint256);
  function getLoan(uint256 loanId) external view returns (DataTypes.LoanData memory loanData);
  function getLoanCollateralAndReserve(uint256 loanId)
    external
    view
    returns (
      address nftAsset,
      uint256 nftTokenId,
      address reserveAsset,
      uint256 scaledAmount
    );
  function getLoanReserveBorrowScaledAmount(uint256 loanId) external view returns (address, uint256);
  function getLoanReserveBorrowAmount(uint256 loanId) external view returns (address, uint256);
  function getLoanHighestBid(uint256 loanId) external view returns (address, uint256);
  function getNftCollateralAmount(address nftAsset) external view returns (uint256);
  function getUserNftCollateralAmount(address user, address nftAsset) external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ILendPoolAddressesProvider} from "./ILendPoolAddressesProvider.sol";
import {DataTypes} from "../libraries/types/DataTypes.sol";
interface ILendPool {
  /**
   * @dev Emitted on deposit()
   * @param user The address initiating the deposit
   * @param amount The amount deposited
   * @param reserve The address of the underlying asset of the reserve
   * @param onBehalfOf The beneficiary of the deposit, receiving the bTokens
   * @param referral The referral code used
   **/
  event Deposit(
    address user,
    address indexed reserve,
    uint256 amount,
    address indexed onBehalfOf,
    uint16 indexed referral
  );
  /**
   * @dev Emitted on withdraw()
   * @param user The address initiating the withdrawal, owner of bTokens
   * @param reserve The address of the underlyng asset being withdrawn
   * @param amount The amount to be withdrawn
   * @param to Address that will receive the underlying
   **/
  event Withdraw(address indexed user, address indexed reserve, uint256 amount, address indexed to);
  /**
   * @dev Emitted on borrow() when loan needs to be opened
   * @param user The address of the user initiating the borrow(), receiving the funds
   * @param reserve The address of the underlying asset being borrowed
   * @param amount The amount borrowed out
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param onBehalfOf The address that will be getting the loan
   * @param referral The referral code used
   **/
  event Borrow(
    address user,
    address indexed reserve,
    uint256 amount,
    address nftAsset,
    uint256 nftTokenId,
    address indexed onBehalfOf,
    uint256 borrowRate,
    uint256 loanId,
    uint16 indexed referral
  );
  /**
   * @dev Emitted on repay()
   * @param user The address of the user initiating the repay(), providing the funds
   * @param reserve The address of the underlying asset of the reserve
   * @param amount The amount repaid
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param borrower The beneficiary of the repayment, getting his debt reduced
   * @param loanId The loan ID of the NFT loans
   **/
  event Repay(
    address user,
    address indexed reserve,
    uint256 amount,
    address indexed nftAsset,
    uint256 nftTokenId,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted when a borrower's loan is auctioned.
   * @param user The address of the user initiating the auction
   * @param reserve The address of the underlying asset of the reserve
   * @param bidPrice The price of the underlying reserve given by the bidder
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param onBehalfOf The address that will be getting the NFT
   * @param loanId The loan ID of the NFT loans
   **/
  event Auction(
    address user,
    address indexed reserve,
    uint256 bidPrice,
    address indexed nftAsset,
    uint256 nftTokenId,
    address onBehalfOf,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted on redeem()
   * @param user The address of the user initiating the redeem(), providing the funds
   * @param reserve The address of the underlying asset of the reserve
   * @param borrowAmount The borrow amount repaid
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param loanId The loan ID of the NFT loans
   **/
  event Redeem(
    address user,
    address indexed reserve,
    uint256 borrowAmount,
    uint256 fineAmount,
    address indexed nftAsset,
    uint256 nftTokenId,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted when a borrower's loan is liquidated.
   * @param user The address of the user initiating the auction
   * @param reserve The address of the underlying asset of the reserve
   * @param repayAmount The amount of reserve repaid by the liquidator
   * @param remainAmount The amount of reserve received by the borrower
   * @param loanId The loan ID of the NFT loans
   **/
  event Liquidate(
    address user,
    address indexed reserve,
    uint256 repayAmount,
    uint256 remainAmount,
    address indexed nftAsset,
    uint256 nftTokenId,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted when the pause is triggered.
   */
  event Paused();
  /**
   * @dev Emitted when the pause is lifted.
   */
  event Unpaused();
  /**
   * @dev Emitted when the pause time is updated.
   */
  event PausedTimeUpdated(uint256 startTime, uint256 durationTime);
  /**
   * @dev Emitted when the state of a reserve is updated. NOTE: This event is actually declared
   * in the ReserveLogic library and emitted in the updateInterestRates() function. Since the function is internal,
   * the event will actually be fired by the LendPool contract. The event is therefore replicated here so it
   * gets added to the LendPool ABI
   * @param reserve The address of the underlying asset of the reserve
   * @param liquidityRate The new liquidity rate
   * @param variableBorrowRate The new variable borrow rate
   * @param liquidityIndex The new liquidity index
   * @param variableBorrowIndex The new variable borrow index
   **/
  event ReserveDataUpdated(
    address indexed reserve,
    uint256 liquidityRate,
    uint256 variableBorrowRate,
    uint256 liquidityIndex,
    uint256 variableBorrowIndex
  );
  /**
   * @dev Deposits an `amount` of underlying asset into the reserve, receiving in return overlying bTokens.
   * - E.g. User deposits 100 USDC and gets in return 100 bUSDC
   * @param reserve The address of the underlying asset to deposit
   * @param amount The amount to be deposited
   * @param onBehalfOf The address that will receive the bTokens, same as msg.sender if the user
   *   wants to receive them on his own wallet, or a different address if the beneficiary of bTokens
   *   is a different wallet
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   **/
  function deposit(
    address reserve,
    uint256 amount,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  /**
   * @dev Withdraws an `amount` of underlying asset from the reserve, burning the equivalent bTokens owned
   * E.g. User has 100 bUSDC, calls withdraw() and receives 100 USDC, burning the 100 bUSDC
   * @param reserve The address of the underlying asset to withdraw
   * @param amount The underlying amount to be withdrawn
   *   - Send the value type(uint256).max in order to withdraw the whole bToken balance
   * @param to Address that will receive the underlying, same as msg.sender if the user
   *   wants to receive it on his own wallet, or a different address if the beneficiary is a
   *   different wallet
   * @return The final amount withdrawn
   **/
  function withdraw(
    address reserve,
    uint256 amount,
    address to
  ) external returns (uint256);
  /**
   * @dev Allows users to borrow a specific `amount` of the reserve underlying asset, provided that the borrower
   * already deposited enough collateral
   * - E.g. User borrows 100 USDC, receiving the 100 USDC in his wallet
   *   and lock collateral asset in contract
   * @param reserveAsset The address of the underlying asset to borrow
   * @param amount The amount to be borrowed
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param onBehalfOf Address of the user who will receive the loan. Should be the address of the borrower itself
   * calling the function if he wants to borrow against his own collateral, or the address of the credit delegator
   * if he has been given credit delegation allowance
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   **/
  function borrow(
    address reserveAsset,
    uint256 amount,
    address nftAsset,
    uint256 nftTokenId,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  function batchBorrow(
    address[] calldata assets,
    uint256[] calldata amounts,
    address[] calldata nftAssets,
    uint256[] calldata nftTokenIds,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  /**
   * @notice Repays a borrowed `amount` on a specific reserve, burning the equivalent loan owned
   * - E.g. User repays 100 USDC, burning loan and receives collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param amount The amount to repay
   * @return The final amount repaid, loan is burned or not
   **/
  function repay(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount
  ) external returns (uint256, bool);
  function batchRepay(
    address[] calldata nftAssets,
    uint256[] calldata nftTokenIds,
    uint256[] calldata amounts
  ) external returns (uint256[] memory, bool[] memory);
  /**
   * @dev Function to auction a non-healthy position collateral-wise
   * - The caller (liquidator) want to buy collateral asset of the user getting liquidated
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param bidPrice The bid price of the liquidator want to buy the underlying NFT
   * @param onBehalfOf Address of the user who will get the underlying NFT, same as msg.sender if the user
   *   wants to receive them on his own wallet, or a different address if the beneficiary of NFT
   *   is a different wallet
   **/
  function auction(
    address nftAsset,
    uint256 nftTokenId,
    uint256 bidPrice,
    address onBehalfOf
  ) external;
  /**
   * @notice Redeem a NFT loan which state is in Auction
   * - E.g. User repays 100 USDC, burning loan and receives collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param amount The amount to repay the debt
   * @param bidFine The amount of bid fine
   **/
  function redeem(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount,
    uint256 bidFine
  ) external returns (uint256);
  /**
   * @dev Function to liquidate a non-healthy position collateral-wise
   * - The caller (liquidator) buy collateral asset of the user getting liquidated, and receives
   *   the collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   **/
  function liquidate(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount
  ) external returns (uint256);
  /**
   * @dev Validates and finalizes an bToken transfer
   * - Only callable by the overlying bToken of the `asset`
   * @param asset The address of the underlying asset of the bToken
   * @param from The user from which the bTokens are transferred
   * @param to The user receiving the bTokens
   * @param amount The amount being transferred/withdrawn
   * @param balanceFromBefore The bToken balance of the `from` user before the transfer
   * @param balanceToBefore The bToken balance of the `to` user before the transfer
   */
  function finalizeTransfer(
    address asset,
    address from,
    address to,
    uint256 amount,
    uint256 balanceFromBefore,
    uint256 balanceToBefore
  ) external view;
  function getReserveConfiguration(address asset) external view returns (DataTypes.ReserveConfigurationMap memory);
  function getNftConfiguration(address asset) external view returns (DataTypes.NftConfigurationMap memory);
  /**
   * @dev Returns the normalized income normalized income of the reserve
   * @param asset The address of the underlying asset of the reserve
   * @return The reserve's normalized income
   */
  function getReserveNormalizedIncome(address asset) external view returns (uint256);
  /**
   * @dev Returns the normalized variable debt per unit of asset
   * @param asset The address of the underlying asset of the reserve
   * @return The reserve normalized variable debt
   */
  function getReserveNormalizedVariableDebt(address asset) external view returns (uint256);
  /**
   * @dev Returns the state and configuration of the reserve
   * @param asset The address of the underlying asset of the reserve
   * @return The state of the reserve
   **/
  function getReserveData(address asset) external view returns (DataTypes.ReserveData memory);
  function getReservesList() external view returns (address[] memory);
  function getNftData(address asset) external view returns (DataTypes.NftData memory);
  /**
   * @dev Returns the loan data of the NFT
   * @param nftAsset The address of the NFT
   * @param reserveAsset The address of the Reserve
   * @return totalCollateralInETH the total collateral in ETH of the NFT
   * @return totalCollateralInReserve the total collateral in Reserve of the NFT
   * @return availableBorrowsInETH the borrowing power in ETH of the NFT
   * @return availableBorrowsInReserve the borrowing power in Reserve of the NFT
   * @return ltv the loan to value of the user
   * @return liquidationThreshold the liquidation threshold of the NFT
   * @return liquidationBonus the liquidation bonus of the NFT
   **/
  function getNftCollateralData(address nftAsset, address reserveAsset)
    external
    view
    returns (
      uint256 totalCollateralInETH,
      uint256 totalCollateralInReserve,
      uint256 availableBorrowsInETH,
      uint256 availableBorrowsInReserve,
      uint256 ltv,
      uint256 liquidationThreshold,
      uint256 liquidationBonus
    );
  /**
   * @dev Returns the debt data of the NFT
   * @param nftAsset The address of the NFT
   * @param nftTokenId The token id of the NFT
   * @return loanId the loan id of the NFT
   * @return reserveAsset the address of the Reserve
   * @return totalCollateral the total power of the NFT
   * @return totalDebt the total debt of the NFT
   * @return availableBorrows the borrowing power left of the NFT
   * @return healthFactor the current health factor of the NFT
   **/
  function getNftDebtData(address nftAsset, uint256 nftTokenId)
    external
    view
    returns (
      uint256 loanId,
      address reserveAsset,
      uint256 totalCollateral,
      uint256 totalDebt,
      uint256 availableBorrows,
      uint256 healthFactor
    );
  /**
   * @dev Returns the auction data of the NFT
   * @param nftAsset The address of the NFT
   * @param nftTokenId The token id of the NFT
   * @return loanId the loan id of the NFT
   * @return bidderAddress the highest bidder address of the loan
   * @return bidPrice the highest bid price in Reserve of the loan
   * @return bidBorrowAmount the borrow amount in Reserve of the loan
   * @return bidFine the penalty fine of the loan
   **/
  function getNftAuctionData(address nftAsset, uint256 nftTokenId)
    external
    view
    returns (
      uint256 loanId,
      address bidderAddress,
      uint256 bidPrice,
      uint256 bidBorrowAmount,
      uint256 bidFine
    );
  function getNftAuctionEndTime(address nftAsset, uint256 nftTokenId)
    external
    view
    returns (
      uint256 loanId,
      uint256 bidStartTimestamp,
      uint256 bidEndTimestamp,
      uint256 redeemEndTimestamp
    );
  function getNftLiquidatePrice(address nftAsset, uint256 nftTokenId)
    external
    view
    returns (uint256 liquidatePrice, uint256 paybackAmount);
  function getNftsList() external view returns (address[] memory);
  /**
   * @dev Set the _pause state of a reserve
   * - Only callable by the LendPool contract
   * @param val `true` to pause the reserve, `false` to un-pause it
   */
  function setPause(bool val) external;
  function setPausedTime(uint256 startTime, uint256 durationTime) external;
  /**
   * @dev Returns if the LendPool is paused
   */
  function paused() external view returns (bool);
  function getPausedTime() external view returns (uint256, uint256);
  function getAddressesProvider() external view returns (ILendPoolAddressesProvider);
  function initReserve(
    address asset,
    address bTokenAddress,
    address debtTokenAddress,
    address interestRateAddress
  ) external;
  function initNft(address asset, address bNftAddress) external;
  function setReserveInterestRateAddress(address asset, address rateAddress) external;
  function setReserveConfiguration(address asset, uint256 configuration) external;
  function setNftConfiguration(address asset, uint256 configuration) external;
  function setNftMaxSupplyAndTokenId(
    address asset,
    uint256 maxSupply,
    uint256 maxTokenId
  ) external;
  function setMaxNumberOfReserves(uint256 val) external;
  function setMaxNumberOfNfts(uint256 val) external;
  function getMaxNumberOfReserves() external view returns (uint256);
  function getMaxNumberOfNfts() external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title LendPoolAddressesProvider contract
 * @dev Main registry of addresses part of or connected to the protocol, including permissioned roles
 * - Acting also as factory of proxies and admin of those, so with right to change its implementations
 * - Owned by the Bend Governance
 * @author Bend
 **/
interface ILendPoolAddressesProvider {
  event MarketIdSet(string newMarketId);
  event LendPoolUpdated(address indexed newAddress, bytes encodedCallData);
  event ConfigurationAdminUpdated(address indexed newAddress);
  event EmergencyAdminUpdated(address indexed newAddress);
  event LendPoolConfiguratorUpdated(address indexed newAddress, bytes encodedCallData);
  event ReserveOracleUpdated(address indexed newAddress);
  event NftOracleUpdated(address indexed newAddress);
  event LendPoolLoanUpdated(address indexed newAddress, bytes encodedCallData);
  event ProxyCreated(bytes32 id, address indexed newAddress);
  event AddressSet(bytes32 id, address indexed newAddress, bool hasProxy, bytes encodedCallData);
  event BNFTRegistryUpdated(address indexed newAddress);
  event IncentivesControllerUpdated(address indexed newAddress);
  event UIDataProviderUpdated(address indexed newAddress);
  event BendDataProviderUpdated(address indexed newAddress);
  event WalletBalanceProviderUpdated(address indexed newAddress);
  function getMarketId() external view returns (string memory);
  function setMarketId(string calldata marketId) external;
  function setAddress(bytes32 id, address newAddress) external;
  function setAddressAsProxy(
    bytes32 id,
    address impl,
    bytes memory encodedCallData
  ) external;
  function getAddress(bytes32 id) external view returns (address);
  function getLendPool() external view returns (address);
  function setLendPoolImpl(address pool, bytes memory encodedCallData) external;
  function getLendPoolConfigurator() external view returns (address);
  function setLendPoolConfiguratorImpl(address configurator, bytes memory encodedCallData) external;
  function getPoolAdmin() external view returns (address);
  function setPoolAdmin(address admin) external;
  function getEmergencyAdmin() external view returns (address);
  function setEmergencyAdmin(address admin) external;
  function getReserveOracle() external view returns (address);
  function setReserveOracle(address reserveOracle) external;
  function getNFTOracle() external view returns (address);
  function setNFTOracle(address nftOracle) external;
  function getLendPoolLoan() external view returns (address);
  function setLendPoolLoanImpl(address loan, bytes memory encodedCallData) external;
  function getBNFTRegistry() external view returns (address);
  function setBNFTRegistry(address factory) external;
  function getIncentivesController() external view returns (address);
  function setIncentivesController(address controller) external;
  function getUIDataProvider() external view returns (address);
  function setUIDataProvider(address provider) external;
  function getBendDataProvider() external view returns (address);
  function setBendDataProvider(address provider) external;
  function getWalletBalanceProvider() external view returns (address);
  function setWalletBalanceProvider(address provider) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
interface ILoanRepaidInterceptor {
  /**
   * @dev Handles before the loan is repaid by the borrower
   * @param nftAsset The address of the underlying asset of the BNFT
   * @param nftTokenId The token id of the underlying asset of the BNFT
   **/
  function beforeLoanRepaid(address nftAsset, uint256 nftTokenId) external returns (bool);
  /**
   * @dev Handles after the loan is repaid by the borrower
   * @param nftAsset The address of the underlying asset of the BNFT
   * @param nftTokenId The token id of the underlying asset of the BNFT
   **/
  function afterLoanRepaid(address nftAsset, uint256 nftTokenId) external returns (bool);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title Errors library
 * @author Bend
 * @notice Defines the error messages emitted by the different contracts of the Bend protocol
 */
library Errors {
  enum ReturnCode {
    SUCCESS,
    FAILED
  }
  string public constant SUCCESS = "0";
  //common errors
  string public constant CALLER_NOT_POOL_ADMIN = "100"; // 'The caller must be the pool admin'
  string public constant CALLER_NOT_ADDRESS_PROVIDER = "101";
  string public constant INVALID_FROM_BALANCE_AFTER_TRANSFER = "102";
  string public constant INVALID_TO_BALANCE_AFTER_TRANSFER = "103";
  string public constant CALLER_NOT_ONBEHALFOF_OR_IN_WHITELIST = "104";
  //math library erros
  string public constant MATH_MULTIPLICATION_OVERFLOW = "200";
  string public constant MATH_ADDITION_OVERFLOW = "201";
  string public constant MATH_DIVISION_BY_ZERO = "202";
  //validation & check errors
  string public constant VL_INVALID_AMOUNT = "301"; // 'Amount must be greater than 0'
  string public constant VL_NO_ACTIVE_RESERVE = "302"; // 'Action requires an active reserve'
  string public constant VL_RESERVE_FROZEN = "303"; // 'Action cannot be performed because the reserve is frozen'
  string public constant VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE = "304"; // 'User cannot withdraw more than the available balance'
  string public constant VL_BORROWING_NOT_ENABLED = "305"; // 'Borrowing is not enabled'
  string public constant VL_COLLATERAL_BALANCE_IS_0 = "306"; // 'The collateral balance is 0'
  string public constant VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD = "307"; // 'Health factor is lesser than the liquidation threshold'
  string public constant VL_COLLATERAL_CANNOT_COVER_NEW_BORROW = "308"; // 'There is not enough collateral to cover a new borrow'
  string public constant VL_NO_DEBT_OF_SELECTED_TYPE = "309"; // 'for repayment of stable debt, the user needs to have stable debt, otherwise, he needs to have variable debt'
  string public constant VL_NO_ACTIVE_NFT = "310";
  string public constant VL_NFT_FROZEN = "311";
  string public constant VL_SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER = "312"; // 'User did not borrow the specified currency'
  string public constant VL_INVALID_HEALTH_FACTOR = "313";
  string public constant VL_INVALID_ONBEHALFOF_ADDRESS = "314";
  string public constant VL_INVALID_TARGET_ADDRESS = "315";
  string public constant VL_INVALID_RESERVE_ADDRESS = "316";
  string public constant VL_SPECIFIED_LOAN_NOT_BORROWED_BY_USER = "317";
  string public constant VL_SPECIFIED_RESERVE_NOT_BORROWED_BY_USER = "318";
  string public constant VL_HEALTH_FACTOR_HIGHER_THAN_LIQUIDATION_THRESHOLD = "319";
  //lend pool errors
  string public constant LP_CALLER_NOT_LEND_POOL_CONFIGURATOR = "400"; // 'The caller of the function is not the lending pool configurator'
  string public constant LP_IS_PAUSED = "401"; // 'Pool is paused'
  string public constant LP_NO_MORE_RESERVES_ALLOWED = "402";
  string public constant LP_NOT_CONTRACT = "403";
  string public constant LP_BORROW_NOT_EXCEED_LIQUIDATION_THRESHOLD = "404";
  string public constant LP_BORROW_IS_EXCEED_LIQUIDATION_PRICE = "405";
  string public constant LP_NO_MORE_NFTS_ALLOWED = "406";
  string public constant LP_INVALIED_USER_NFT_AMOUNT = "407";
  string public constant LP_INCONSISTENT_PARAMS = "408";
  string public constant LP_NFT_IS_NOT_USED_AS_COLLATERAL = "409";
  string public constant LP_CALLER_MUST_BE_AN_BTOKEN = "410";
  string public constant LP_INVALIED_NFT_AMOUNT = "411";
  string public constant LP_NFT_HAS_USED_AS_COLLATERAL = "412";
  string public constant LP_DELEGATE_CALL_FAILED = "413";
  string public constant LP_AMOUNT_LESS_THAN_EXTRA_DEBT = "414";
  string public constant LP_AMOUNT_LESS_THAN_REDEEM_THRESHOLD = "415";
  string public constant LP_AMOUNT_GREATER_THAN_MAX_REPAY = "416";
  string public constant LP_NFT_TOKEN_ID_EXCEED_MAX_LIMIT = "417";
  string public constant LP_NFT_SUPPLY_NUM_EXCEED_MAX_LIMIT = "418";
  string public constant LP_CALLER_NOT_VALID_INTERCEPTOR = "419";
  string public constant LP_CALLER_NOT_VALID_LOCKER = "420";
  //lend pool loan errors
  string public constant LPL_INVALID_LOAN_STATE = "480";
  string public constant LPL_INVALID_LOAN_AMOUNT = "481";
  string public constant LPL_INVALID_TAKEN_AMOUNT = "482";
  string public constant LPL_AMOUNT_OVERFLOW = "483";
  string public constant LPL_BID_PRICE_LESS_THAN_LIQUIDATION_PRICE = "484";
  string public constant LPL_BID_PRICE_LESS_THAN_HIGHEST_PRICE = "485";
  string public constant LPL_BID_REDEEM_DURATION_HAS_END = "486";
  string public constant LPL_BID_USER_NOT_SAME = "487";
  string public constant LPL_BID_REPAY_AMOUNT_NOT_ENOUGH = "488";
  string public constant LPL_BID_AUCTION_DURATION_HAS_END = "489";
  string public constant LPL_BID_AUCTION_DURATION_NOT_END = "490";
  string public constant LPL_BID_PRICE_LESS_THAN_BORROW = "491";
  string public constant LPL_INVALID_BIDDER_ADDRESS = "492";
  string public constant LPL_AMOUNT_LESS_THAN_BID_FINE = "493";
  string public constant LPL_INVALID_BID_FINE = "494";
  //common token errors
  string public constant CT_CALLER_MUST_BE_LEND_POOL = "500"; // 'The caller of this function must be a lending pool'
  string public constant CT_INVALID_MINT_AMOUNT = "501"; //invalid amount to mint
  string public constant CT_INVALID_BURN_AMOUNT = "502"; //invalid amount to burn
  string public constant CT_BORROW_ALLOWANCE_NOT_ENOUGH = "503";
  //reserve logic errors
  string public constant RL_RESERVE_ALREADY_INITIALIZED = "601"; // 'Reserve has already been initialized'
  string public constant RL_LIQUIDITY_INDEX_OVERFLOW = "602"; //  Liquidity index overflows uint128
  string public constant RL_VARIABLE_BORROW_INDEX_OVERFLOW = "603"; //  Variable borrow index overflows uint128
  string public constant RL_LIQUIDITY_RATE_OVERFLOW = "604"; //  Liquidity rate overflows uint128
  string public constant RL_VARIABLE_BORROW_RATE_OVERFLOW = "605"; //  Variable borrow rate overflows uint128
  //configure errors
  string public constant LPC_RESERVE_LIQUIDITY_NOT_0 = "700"; // 'The liquidity of the reserve needs to be 0'
  string public constant LPC_INVALID_CONFIGURATION = "701"; // 'Invalid risk parameters for the reserve'
  string public constant LPC_CALLER_NOT_EMERGENCY_ADMIN = "702"; // 'The caller must be the emergency admin'
  string public constant LPC_INVALIED_BNFT_ADDRESS = "703";
  string public constant LPC_INVALIED_LOAN_ADDRESS = "704";
  string public constant LPC_NFT_LIQUIDITY_NOT_0 = "705";
  //reserve config errors
  string public constant RC_INVALID_LTV = "730";
  string public constant RC_INVALID_LIQ_THRESHOLD = "731";
  string public constant RC_INVALID_LIQ_BONUS = "732";
  string public constant RC_INVALID_DECIMALS = "733";
  string public constant RC_INVALID_RESERVE_FACTOR = "734";
  string public constant RC_INVALID_REDEEM_DURATION = "735";
  string public constant RC_INVALID_AUCTION_DURATION = "736";
  string public constant RC_INVALID_REDEEM_FINE = "737";
  string public constant RC_INVALID_REDEEM_THRESHOLD = "738";
  string public constant RC_INVALID_MIN_BID_FINE = "739";
  string public constant RC_INVALID_MAX_BID_FINE = "740";
  //address provider erros
  string public constant LPAPR_PROVIDER_NOT_REGISTERED = "760"; // 'Provider is not registered'
  string public constant LPAPR_INVALID_ADDRESSES_PROVIDER_ID = "761";
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
library DataTypes {
  struct ReserveData {
    //stores the reserve configuration
    ReserveConfigurationMap configuration;
    //the liquidity index. Expressed in ray
    uint128 liquidityIndex;
    //variable borrow index. Expressed in ray
    uint128 variableBorrowIndex;
    //the current supply rate. Expressed in ray
    uint128 currentLiquidityRate;
    //the current variable borrow rate. Expressed in ray
    uint128 currentVariableBorrowRate;
    uint40 lastUpdateTimestamp;
    //tokens addresses
    address bTokenAddress;
    address debtTokenAddress;
    //address of the interest rate strategy
    address interestRateAddress;
    //the id of the reserve. Represents the position in the list of the active reserves
    uint8 id;
  }
  struct NftData {
    //stores the nft configuration
    NftConfigurationMap configuration;
    //address of the bNFT contract
    address bNftAddress;
    //the id of the nft. Represents the position in the list of the active nfts
    uint8 id;
    uint256 maxSupply;
    uint256 maxTokenId;
  }
  struct ReserveConfigurationMap {
    //bit 0-15: LTV
    //bit 16-31: Liq. threshold
    //bit 32-47: Liq. bonus
    //bit 48-55: Decimals
    //bit 56: Reserve is active
    //bit 57: reserve is frozen
    //bit 58: borrowing is enabled
    //bit 59: stable rate borrowing enabled
    //bit 60-63: reserved
    //bit 64-79: reserve factor
    uint256 data;
  }
  struct NftConfigurationMap {
    //bit 0-15: LTV
    //bit 16-31: Liq. threshold
    //bit 32-47: Liq. bonus
    //bit 56: NFT is active
    //bit 57: NFT is frozen
    uint256 data;
  }
  /**
   * @dev Enum describing the current state of a loan
   * State change flow:
   *  Created -> Active -> Repaid
   *                    -> Auction -> Defaulted
   */
  enum LoanState {
    // We need a default that is not 'Created' - this is the zero value
    None,
    // The loan data is stored, but not initiated yet.
    Created,
    // The loan has been initialized, funds have been delivered to the borrower and the collateral is held.
    Active,
    // The loan is in auction, higest price liquidator will got chance to claim it.
    Auction,
    // The loan has been repaid, and the collateral has been returned to the borrower. This is a terminal state.
    Repaid,
    // The loan was delinquent and collateral claimed by the liquidator. This is a terminal state.
    Defaulted
  }
  struct LoanData {
    //the id of the nft loan
    uint256 loanId;
    //the current state of the loan
    LoanState state;
    //address of borrower
    address borrower;
    //address of nft asset token
    address nftAsset;
    //the id of nft token
    uint256 nftTokenId;
    //address of reserve asset token
    address reserveAsset;
    //scaled borrow amount. Expressed in ray
    uint256 scaledAmount;
    //start time of first bid time
    uint256 bidStartTimestamp;
    //bidder address of higest bid
    address bidderAddress;
    //price of higest bid
    uint256 bidPrice;
    //borrow amount of loan
    uint256 bidBorrowAmount;
    //bidder address of first bid
    address firstBidderAddress;
  }
  struct ExecuteDepositParams {
    address initiator;
    address asset;
    uint256 amount;
    address onBehalfOf;
    uint16 referralCode;
  }
  struct ExecuteWithdrawParams {
    address initiator;
    address asset;
    uint256 amount;
    address to;
  }
  struct ExecuteBorrowParams {
    address initiator;
    address asset;
    uint256 amount;
    address nftAsset;
    uint256 nftTokenId;
    address onBehalfOf;
    uint16 referralCode;
  }
  struct ExecuteBatchBorrowParams {
    address initiator;
    address[] assets;
    uint256[] amounts;
    address[] nftAssets;
    uint256[] nftTokenIds;
    address onBehalfOf;
    uint16 referralCode;
  }
  struct ExecuteRepayParams {
    address initiator;
    address nftAsset;
    uint256 nftTokenId;
    uint256 amount;
  }
  struct ExecuteBatchRepayParams {
    address initiator;
    address[] nftAssets;
    uint256[] nftTokenIds;
    uint256[] amounts;
  }
  struct ExecuteAuctionParams {
    address initiator;
    address nftAsset;
    uint256 nftTokenId;
    uint256 bidPrice;
    address onBehalfOf;
  }
  struct ExecuteRedeemParams {
    address initiator;
    address nftAsset;
    uint256 nftTokenId;
    uint256 amount;
    uint256 bidFine;
  }
  struct ExecuteLiquidateParams {
    address initiator;
    address nftAsset;
    uint256 nftTokenId;
    uint256 amount;
  }
  struct ExecuteLendPoolStates {
    uint256 pauseStartTime;
    uint256 pauseDurationTime;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {Errors} from "../helpers/Errors.sol";
/**
 * @title WadRayMath library
 * @author Bend
 * @dev Provides mul and div function for wads (decimal numbers with 18 digits precision) and rays (decimals with 27 digits)
 **/
library WadRayMath {
  uint256 internal constant WAD = 1e18;
  uint256 internal constant HALF_WAD = WAD / 2;
  uint256 internal constant RAY = 1e27;
  uint256 internal constant HALF_RAY = RAY / 2;
  uint256 internal constant WAD_RAY_RATIO = 1e9;
  /**
   * @return One ray, 1e27
   **/
  function ray() internal pure returns (uint256) {
    return RAY;
  }
  /**
   * @return One wad, 1e18
   **/
  function wad() internal pure returns (uint256) {
    return WAD;
  }
  /**
   * @return Half ray, 1e27/2
   **/
  function halfRay() internal pure returns (uint256) {
    return HALF_RAY;
  }
  /**
   * @return Half ray, 1e18/2
   **/
  function halfWad() internal pure returns (uint256) {
    return HALF_WAD;
  }
  /**
   * @dev Multiplies two wad, rounding half up to the nearest wad
   * @param a Wad
   * @param b Wad
   * @return The result of a*b, in wad
   **/
  function wadMul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0 || b == 0) {
      return 0;
    }
    require(a <= (type(uint256).max - HALF_WAD) / b, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (a * b + HALF_WAD) / WAD;
  }
  /**
   * @dev Divides two wad, rounding half up to the nearest wad
   * @param a Wad
   * @param b Wad
   * @return The result of a/b, in wad
   **/
  function wadDiv(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0, Errors.MATH_DIVISION_BY_ZERO);
    uint256 halfB = b / 2;
    require(a <= (type(uint256).max - halfB) / WAD, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (a * WAD + halfB) / b;
  }
  /**
   * @dev Multiplies two ray, rounding half up to the nearest ray
   * @param a Ray
   * @param b Ray
   * @return The result of a*b, in ray
   **/
  function rayMul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0 || b == 0) {
      return 0;
    }
    require(a <= (type(uint256).max - HALF_RAY) / b, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (a * b + HALF_RAY) / RAY;
  }
  /**
   * @dev Divides two ray, rounding half up to the nearest ray
   * @param a Ray
   * @param b Ray
   * @return The result of a/b, in ray
   **/
  function rayDiv(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0, Errors.MATH_DIVISION_BY_ZERO);
    uint256 halfB = b / 2;
    require(a <= (type(uint256).max - halfB) / RAY, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (a * RAY + halfB) / b;
  }
  /**
   * @dev Casts ray down to wad
   * @param a Ray
   * @return a casted to wad, rounded half up to the nearest wad
   **/
  function rayToWad(uint256 a) internal pure returns (uint256) {
    uint256 halfRatio = WAD_RAY_RATIO / 2;
    uint256 result = halfRatio + a;
    require(result >= halfRatio, Errors.MATH_ADDITION_OVERFLOW);
    return result / WAD_RAY_RATIO;
  }
  /**
   * @dev Converts wad up to ray
   * @param a Wad
   * @return a converted in ray
   **/
  function wadToRay(uint256 a) internal pure returns (uint256) {
    uint256 result = a * WAD_RAY_RATIO;
    require(result / WAD_RAY_RATIO == a, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return result;
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165Upgradeable.sol";
/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721Upgradeable is IERC165Upgradeable {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);
    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;
    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);
    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;
    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)
pragma solidity ^0.8.0;
/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721ReceiverUpgradeable {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)
pragma solidity ^0.8.0;
/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library CountersUpgradeable {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }
    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }
    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }
    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }
    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/utils/Initializable.sol)
pragma solidity ^0.8.0;
import "../../utils/AddressUpgradeable.sol";
/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To initialize the implementation contract, you can either invoke the
 * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() initializer {}
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;
    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;
    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, because in other contexts the
        // contract may have been reentered.
        require(_initializing ? _isConstructor() : !_initialized, "Initializable: contract is already initialized");
        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
        }
    }
    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} modifier, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }
    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";
/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
        __Context_init_unchained();
    }
    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
    uint256[50] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165Upgradeable {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)
pragma solidity ^0.8.0;
/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// Copyright (C) 2015, 2016, 2017 Dapphub

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity ^0.4.18;

contract WETH9 {
    string public name     = "Wrapped Ether";
    string public symbol   = "WETH";
    uint8  public decimals = 18;

    event  Approval(address indexed src, address indexed guy, uint wad);
    event  Transfer(address indexed src, address indexed dst, uint wad);
    event  Deposit(address indexed dst, uint wad);
    event  Withdrawal(address indexed src, uint wad);

    mapping (address => uint)                       public  balanceOf;
    mapping (address => mapping (address => uint))  public  allowance;

    function() public payable {
        deposit();
    }
    function deposit() public payable {
        balanceOf[msg.sender] += msg.value;
        Deposit(msg.sender, msg.value);
    }
    function withdraw(uint wad) public {
        require(balanceOf[msg.sender] >= wad);
        balanceOf[msg.sender] -= wad;
        msg.sender.transfer(wad);
        Withdrawal(msg.sender, wad);
    }

    function totalSupply() public view returns (uint) {
        return this.balance;
    }

    function approve(address guy, uint wad) public returns (bool) {
        allowance[msg.sender][guy] = wad;
        Approval(msg.sender, guy, wad);
        return true;
    }

    function transfer(address dst, uint wad) public returns (bool) {
        return transferFrom(msg.sender, dst, wad);
    }

    function transferFrom(address src, address dst, uint wad)
        public
        returns (bool)
    {
        require(balanceOf[src] >= wad);

        if (src != msg.sender && allowance[src][msg.sender] != uint(-1)) {
            require(allowance[src][msg.sender] >= wad);
            allowance[src][msg.sender] -= wad;
        }

        balanceOf[src] -= wad;
        balanceOf[dst] += wad;

        Transfer(src, dst, wad);

        return true;
    }
}


/*
                    GNU GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007

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License will continue to apply to the part which is the covered work,
but the special requirements of the GNU Affero General Public License,
section 13, concerning interaction through a network will apply to the
combination as such.

  14. Revised Versions of this License.

  The Free Software Foundation may publish revised and/or new versions of
the GNU General Public License from time to time.  Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.

  Each version is given a distinguishing version number.  If the
Program specifies that a certain numbered version of the GNU General
Public License "or any later version" applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation.  If the Program does not specify a version number of the
GNU General Public License, you may choose any version ever published
by the Free Software Foundation.

  If the Program specifies that a proxy can decide which future
versions of the GNU General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.

  Later license versions may give you additional or different
permissions.  However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.

  15. Disclaimer of Warranty.

  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.

  16. Limitation of Liability.

  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.

  17. Interpretation of Sections 15 and 16.

  If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.

                     END OF TERMS AND CONDITIONS

            How to Apply These Terms to Your New Programs

  If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.

  To do so, attach the following notices to the program.  It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.

    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

Also add information on how to contact you by electronic and paper mail.

  If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:

    <program>  Copyright (C) <year>  <name of author>
    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.

The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License.  Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".

  You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.

  The GNU General Public License does not permit incorporating your program
into proprietary programs.  If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library.  If this is what you want to do, use the GNU Lesser General
Public License instead of this License.  But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

*/

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {TransparentUpgradeableProxy} from "@openzeppelin/contracts/proxy/transparent/TransparentUpgradeableProxy.sol";
import "../helpers/Errors.sol";
contract BendUpgradeableProxy is TransparentUpgradeableProxy {
  constructor(
    address _logic,
    address admin_,
    bytes memory _data
  ) payable TransparentUpgradeableProxy(_logic, admin_, _data) {}
  modifier OnlyAdmin() {
    require(msg.sender == _getAdmin(), Errors.CALLER_NOT_POOL_ADMIN);
    _;
  }
  function getImplementation() external view OnlyAdmin returns (address) {
    return _getImplementation();
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/transparent/TransparentUpgradeableProxy.sol)
pragma solidity ^0.8.0;
import "../ERC1967/ERC1967Proxy.sol";
/**
 * @dev This contract implements a proxy that is upgradeable by an admin.
 *
 * To avoid https://medium.com/nomic-labs-blog/malicious-backdoors-in-ethereum-proxies-62629adf3357[proxy selector
 * clashing], which can potentially be used in an attack, this contract uses the
 * https://blog.openzeppelin.com/the-transparent-proxy-pattern/[transparent proxy pattern]. This pattern implies two
 * things that go hand in hand:
 *
 * 1. If any account other than the admin calls the proxy, the call will be forwarded to the implementation, even if
 * that call matches one of the admin functions exposed by the proxy itself.
 * 2. If the admin calls the proxy, it can access the admin functions, but its calls will never be forwarded to the
 * implementation. If the admin tries to call a function on the implementation it will fail with an error that says
 * "admin cannot fallback to proxy target".
 *
 * These properties mean that the admin account can only be used for admin actions like upgrading the proxy or changing
 * the admin, so it's best if it's a dedicated account that is not used for anything else. This will avoid headaches due
 * to sudden errors when trying to call a function from the proxy implementation.
 *
 * Our recommendation is for the dedicated account to be an instance of the {ProxyAdmin} contract. If set up this way,
 * you should think of the `ProxyAdmin` instance as the real administrative interface of your proxy.
 */
contract TransparentUpgradeableProxy is ERC1967Proxy {
    /**
     * @dev Initializes an upgradeable proxy managed by `_admin`, backed by the implementation at `_logic`, and
     * optionally initialized with `_data` as explained in {ERC1967Proxy-constructor}.
     */
    constructor(
        address _logic,
        address admin_,
        bytes memory _data
    ) payable ERC1967Proxy(_logic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        _changeAdmin(admin_);
    }
    /**
     * @dev Modifier used internally that will delegate the call to the implementation unless the sender is the admin.
     */
    modifier ifAdmin() {
        if (msg.sender == _getAdmin()) {
            _;
        } else {
            _fallback();
        }
    }
    /**
     * @dev Returns the current admin.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyAdmin}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function admin() external ifAdmin returns (address admin_) {
        admin_ = _getAdmin();
    }
    /**
     * @dev Returns the current implementation.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyImplementation}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc`
     */
    function implementation() external ifAdmin returns (address implementation_) {
        implementation_ = _implementation();
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-changeProxyAdmin}.
     */
    function changeAdmin(address newAdmin) external virtual ifAdmin {
        _changeAdmin(newAdmin);
    }
    /**
     * @dev Upgrade the implementation of the proxy.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgrade}.
     */
    function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeToAndCall(newImplementation, bytes(""), false);
    }
    /**
     * @dev Upgrade the implementation of the proxy, and then call a function from the new implementation as specified
     * by `data`, which should be an encoded function call. This is useful to initialize new storage variables in the
     * proxied contract.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgradeAndCall}.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable ifAdmin {
        _upgradeToAndCall(newImplementation, data, true);
    }
    /**
     * @dev Returns the current admin.
     */
    function _admin() internal view virtual returns (address) {
        return _getAdmin();
    }
    /**
     * @dev Makes sure the admin cannot access the fallback function. See {Proxy-_beforeFallback}.
     */
    function _beforeFallback() internal virtual override {
        require(msg.sender != _getAdmin(), "TransparentUpgradeableProxy: admin cannot fallback to proxy target");
        super._beforeFallback();
    }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title Errors library
 * @author Bend
 * @notice Defines the error messages emitted by the different contracts of the Bend protocol
 */
library Errors {
  enum ReturnCode {
    SUCCESS,
    FAILED
  }
  string public constant SUCCESS = "0";
  //common errors
  string public constant CALLER_NOT_POOL_ADMIN = "100"; // 'The caller must be the pool admin'
  string public constant CALLER_NOT_ADDRESS_PROVIDER = "101";
  string public constant INVALID_FROM_BALANCE_AFTER_TRANSFER = "102";
  string public constant INVALID_TO_BALANCE_AFTER_TRANSFER = "103";
  //math library erros
  string public constant MATH_MULTIPLICATION_OVERFLOW = "200";
  string public constant MATH_ADDITION_OVERFLOW = "201";
  string public constant MATH_DIVISION_BY_ZERO = "202";
  //validation & check errors
  string public constant VL_INVALID_AMOUNT = "301"; // 'Amount must be greater than 0'
  string public constant VL_NO_ACTIVE_RESERVE = "302"; // 'Action requires an active reserve'
  string public constant VL_RESERVE_FROZEN = "303"; // 'Action cannot be performed because the reserve is frozen'
  string public constant VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE = "304"; // 'User cannot withdraw more than the available balance'
  string public constant VL_BORROWING_NOT_ENABLED = "305"; // 'Borrowing is not enabled'
  string public constant VL_COLLATERAL_BALANCE_IS_0 = "306"; // 'The collateral balance is 0'
  string public constant VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD = "307"; // 'Health factor is lesser than the liquidation threshold'
  string public constant VL_COLLATERAL_CANNOT_COVER_NEW_BORROW = "308"; // 'There is not enough collateral to cover a new borrow'
  string public constant VL_NO_DEBT_OF_SELECTED_TYPE = "309"; // 'for repayment of stable debt, the user needs to have stable debt, otherwise, he needs to have variable debt'
  string public constant VL_NO_ACTIVE_NFT = "310";
  string public constant VL_NFT_FROZEN = "311";
  string public constant VL_SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER = "312"; // 'User did not borrow the specified currency'
  string public constant VL_INVALID_HEALTH_FACTOR = "313";
  string public constant VL_INVALID_ONBEHALFOF_ADDRESS = "314";
  string public constant VL_INVALID_TARGET_ADDRESS = "315";
  string public constant VL_INVALID_RESERVE_ADDRESS = "316";
  string public constant VL_SPECIFIED_LOAN_NOT_BORROWED_BY_USER = "317";
  string public constant VL_SPECIFIED_RESERVE_NOT_BORROWED_BY_USER = "318";
  string public constant VL_HEALTH_FACTOR_HIGHER_THAN_LIQUIDATION_THRESHOLD = "319";
  //lend pool errors
  string public constant LP_CALLER_NOT_LEND_POOL_CONFIGURATOR = "400"; // 'The caller of the function is not the lending pool configurator'
  string public constant LP_IS_PAUSED = "401"; // 'Pool is paused'
  string public constant LP_NO_MORE_RESERVES_ALLOWED = "402";
  string public constant LP_NOT_CONTRACT = "403";
  string public constant LP_BORROW_NOT_EXCEED_LIQUIDATION_THRESHOLD = "404";
  string public constant LP_BORROW_IS_EXCEED_LIQUIDATION_PRICE = "405";
  string public constant LP_NO_MORE_NFTS_ALLOWED = "406";
  string public constant LP_INVALIED_USER_NFT_AMOUNT = "407";
  string public constant LP_INCONSISTENT_PARAMS = "408";
  string public constant LP_NFT_IS_NOT_USED_AS_COLLATERAL = "409";
  string public constant LP_CALLER_MUST_BE_AN_BTOKEN = "410";
  string public constant LP_INVALIED_NFT_AMOUNT = "411";
  string public constant LP_NFT_HAS_USED_AS_COLLATERAL = "412";
  string public constant LP_DELEGATE_CALL_FAILED = "413";
  string public constant LP_AMOUNT_LESS_THAN_EXTRA_DEBT = "414";
  string public constant LP_AMOUNT_LESS_THAN_REDEEM_THRESHOLD = "415";
  //lend pool loan errors
  string public constant LPL_INVALID_LOAN_STATE = "480";
  string public constant LPL_INVALID_LOAN_AMOUNT = "481";
  string public constant LPL_INVALID_TAKEN_AMOUNT = "482";
  string public constant LPL_AMOUNT_OVERFLOW = "483";
  string public constant LPL_BID_PRICE_LESS_THAN_LIQUIDATION_PRICE = "484";
  string public constant LPL_BID_PRICE_LESS_THAN_HIGHEST_PRICE = "485";
  string public constant LPL_BID_REDEEM_DURATION_HAS_END = "486";
  string public constant LPL_BID_USER_NOT_SAME = "487";
  string public constant LPL_BID_REPAY_AMOUNT_NOT_ENOUGH = "488";
  string public constant LPL_BID_AUCTION_DURATION_HAS_END = "489";
  string public constant LPL_BID_AUCTION_DURATION_NOT_END = "490";
  string public constant LPL_BID_PRICE_LESS_THAN_BORROW = "491";
  string public constant LPL_INVALID_BIDDER_ADDRESS = "492";
  string public constant LPL_AMOUNT_LESS_THAN_BID_FINE = "493";
  //common token errors
  string public constant CT_CALLER_MUST_BE_LEND_POOL = "500"; // 'The caller of this function must be a lending pool'
  string public constant CT_INVALID_MINT_AMOUNT = "501"; //invalid amount to mint
  string public constant CT_INVALID_BURN_AMOUNT = "502"; //invalid amount to burn
  //reserve logic errors
  string public constant RL_RESERVE_ALREADY_INITIALIZED = "601"; // 'Reserve has already been initialized'
  string public constant RL_LIQUIDITY_INDEX_OVERFLOW = "602"; //  Liquidity index overflows uint128
  string public constant RL_VARIABLE_BORROW_INDEX_OVERFLOW = "603"; //  Variable borrow index overflows uint128
  string public constant RL_LIQUIDITY_RATE_OVERFLOW = "604"; //  Liquidity rate overflows uint128
  string public constant RL_VARIABLE_BORROW_RATE_OVERFLOW = "605"; //  Variable borrow rate overflows uint128
  //configure errors
  string public constant LPC_RESERVE_LIQUIDITY_NOT_0 = "700"; // 'The liquidity of the reserve needs to be 0'
  string public constant LPC_INVALID_CONFIGURATION = "701"; // 'Invalid risk parameters for the reserve'
  string public constant LPC_CALLER_NOT_EMERGENCY_ADMIN = "702"; // 'The caller must be the emergency admin'
  string public constant LPC_INVALIED_BNFT_ADDRESS = "703";
  string public constant LPC_INVALIED_LOAN_ADDRESS = "704";
  string public constant LPC_NFT_LIQUIDITY_NOT_0 = "705";
  //reserve config errors
  string public constant RC_INVALID_LTV = "730";
  string public constant RC_INVALID_LIQ_THRESHOLD = "731";
  string public constant RC_INVALID_LIQ_BONUS = "732";
  string public constant RC_INVALID_DECIMALS = "733";
  string public constant RC_INVALID_RESERVE_FACTOR = "734";
  string public constant RC_INVALID_REDEEM_DURATION = "735";
  string public constant RC_INVALID_AUCTION_DURATION = "736";
  string public constant RC_INVALID_REDEEM_FINE = "737";
  string public constant RC_INVALID_REDEEM_THRESHOLD = "738";
  //address provider erros
  string public constant LPAPR_PROVIDER_NOT_REGISTERED = "760"; // 'Provider is not registered'
  string public constant LPAPR_INVALID_ADDRESSES_PROVIDER_ID = "761";
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/ERC1967/ERC1967Proxy.sol)
pragma solidity ^0.8.0;
import "../Proxy.sol";
import "./ERC1967Upgrade.sol";
/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 */
contract ERC1967Proxy is Proxy, ERC1967Upgrade {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     *
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _upgradeToAndCall(_logic, _data, false);
    }
    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal view virtual override returns (address impl) {
        return ERC1967Upgrade._getImplementation();
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/Proxy.sol)
pragma solidity ^0.8.0;
/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())
            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())
            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }
    /**
     * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);
    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback() external payable virtual {
        _fallback();
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive() external payable virtual {
        _fallback();
    }
    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/ERC1967/ERC1967Upgrade.sol)
pragma solidity ^0.8.2;
import "../beacon/IBeacon.sol";
import "../../utils/Address.sol";
import "../../utils/StorageSlot.sol";
/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 *
 * @custom:oz-upgrades-unsafe-allow delegatecall
 */
abstract contract ERC1967Upgrade {
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);
    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }
    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }
    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
    }
    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallSecure(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        address oldImplementation = _getImplementation();
        // Initial upgrade and setup call
        _setImplementation(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
        // Perform rollback test if not already in progress
        StorageSlot.BooleanSlot storage rollbackTesting = StorageSlot.getBooleanSlot(_ROLLBACK_SLOT);
        if (!rollbackTesting.value) {
            // Trigger rollback using upgradeTo from the new implementation
            rollbackTesting.value = true;
            Address.functionDelegateCall(
                newImplementation,
                abi.encodeWithSignature("upgradeTo(address)", oldImplementation)
            );
            rollbackTesting.value = false;
            // Check rollback was effective
            require(oldImplementation == _getImplementation(), "ERC1967Upgrade: upgrade breaks further upgrades");
            // Finally reset to the new implementation and log the upgrade
            _upgradeTo(newImplementation);
        }
    }
    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);
    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
    }
    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlot.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }
    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }
    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;
    /**
     * @dev Emitted when the beacon is upgraded.
     */
    event BeaconUpgraded(address indexed beacon);
    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(_BEACON_SLOT).value;
    }
    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(Address.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            Address.isContract(IBeacon(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlot.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }
    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(
        address newBeacon,
        bytes memory data,
        bool forceCall
    ) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)
pragma solidity ^0.8.0;
/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)
pragma solidity ^0.8.0;
/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/StorageSlot.sol)
pragma solidity ^0.8.0;
/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }
    struct BooleanSlot {
        bool value;
    }
    struct Bytes32Slot {
        bytes32 value;
    }
    struct Uint256Slot {
        uint256 value;
    }
    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ILendPoolLoan} from "../interfaces/ILendPoolLoan.sol";
import {ILendPool} from "../interfaces/ILendPool.sol";
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
import {Errors} from "../libraries/helpers/Errors.sol";
import {WadRayMath} from "../libraries/math/WadRayMath.sol";
import {GenericLogic} from "../libraries/logic/GenericLogic.sol";
import {PercentageMath} from "../libraries/math/PercentageMath.sol";
import {ReserveLogic} from "../libraries/logic/ReserveLogic.sol";
import {NftLogic} from "../libraries/logic/NftLogic.sol";
import {ValidationLogic} from "../libraries/logic/ValidationLogic.sol";
import {SupplyLogic} from "../libraries/logic/SupplyLogic.sol";
import {BorrowLogic} from "../libraries/logic/BorrowLogic.sol";
import {LiquidateLogic} from "../libraries/logic/LiquidateLogic.sol";
import {ReserveConfiguration} from "../libraries/configuration/ReserveConfiguration.sol";
import {NftConfiguration} from "../libraries/configuration/NftConfiguration.sol";
import {DataTypes} from "../libraries/types/DataTypes.sol";
import {LendPoolStorage} from "./LendPoolStorage.sol";
import {LendPoolStorageExt} from "./LendPoolStorageExt.sol";
import {AddressUpgradeable} from "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
import {IERC721Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
import {IERC721ReceiverUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721ReceiverUpgradeable.sol";
import {Initializable} from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import {ContextUpgradeable} from "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";
/**
 * @title LendPool contract
 * @dev Main point of interaction with an Bend protocol's market
 * - Users can:
 *   # Deposit
 *   # Withdraw
 *   # Borrow
 *   # Repay
 *   # Auction
 *   # Liquidate
 * - To be covered by a proxy contract, owned by the LendPoolAddressesProvider of the specific market
 * - All admin functions are callable by the LendPoolConfigurator contract defined also in the
 *   LendPoolAddressesProvider
 * @author Bend
 **/
// !!! For Upgradable: DO NOT ADJUST Inheritance Order !!!
contract LendPool is
  Initializable,
  ILendPool,
  LendPoolStorage,
  ContextUpgradeable,
  IERC721ReceiverUpgradeable,
  LendPoolStorageExt
{
  using WadRayMath for uint256;
  using PercentageMath for uint256;
  using SafeERC20Upgradeable for IERC20Upgradeable;
  using ReserveLogic for DataTypes.ReserveData;
  using NftLogic for DataTypes.NftData;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  using NftConfiguration for DataTypes.NftConfigurationMap;
  /**
   * @dev Prevents a contract from calling itself, directly or indirectly.
   * Calling a `nonReentrant` function from another `nonReentrant`
   * function is not supported. It is possible to prevent this from happening
   * by making the `nonReentrant` function external, and making it call a
   * `private` function that does the actual work.
   */
  modifier nonReentrant() {
    // On the first call to nonReentrant, _notEntered will be true
    require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
    // Any calls to nonReentrant after this point will fail
    _status = _ENTERED;
    _;
    // By storing the original value once again, a refund is triggered (see
    // https://eips.ethereum.org/EIPS/eip-2200)
    _status = _NOT_ENTERED;
  }
  modifier whenNotPaused() {
    _whenNotPaused();
    _;
  }
  modifier onlyLendPoolConfigurator() {
    _onlyLendPoolConfigurator();
    _;
  }
  function _whenNotPaused() internal view {
    require(!_paused, Errors.LP_IS_PAUSED);
  }
  function _onlyLendPoolConfigurator() internal view {
    require(_addressesProvider.getLendPoolConfigurator() == _msgSender(), Errors.LP_CALLER_NOT_LEND_POOL_CONFIGURATOR);
  }
  /**
   * @dev Function is invoked by the proxy contract when the LendPool contract is added to the
   * LendPoolAddressesProvider of the market.
   * - Caching the address of the LendPoolAddressesProvider in order to reduce gas consumption
   *   on subsequent operations
   * @param provider The address of the LendPoolAddressesProvider
   **/
  function initialize(ILendPoolAddressesProvider provider) public initializer {
    _maxNumberOfReserves = 32;
    _maxNumberOfNfts = 256;
    _addressesProvider = provider;
  }
  /**
   * @dev Deposits an `amount` of underlying asset into the reserve, receiving in return overlying bTokens.
   * - E.g. User deposits 100 USDC and gets in return 100 bUSDC
   * @param asset The address of the underlying asset to deposit
   * @param amount The amount to be deposited
   * @param onBehalfOf The address that will receive the bTokens, same as msg.sender if the user
   *   wants to receive them on his own wallet, or a different address if the beneficiary of bTokens
   *   is a different wallet
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   **/
  function deposit(
    address asset,
    uint256 amount,
    address onBehalfOf,
    uint16 referralCode
  ) external override nonReentrant whenNotPaused {
    SupplyLogic.executeDeposit(
      _reserves,
      DataTypes.ExecuteDepositParams({
        initiator: _msgSender(),
        asset: asset,
        amount: amount,
        onBehalfOf: onBehalfOf,
        referralCode: referralCode
      })
    );
  }
  /**
   * @dev Withdraws an `amount` of underlying asset from the reserve, burning the equivalent bTokens owned
   * E.g. User has 100 bUSDC, calls withdraw() and receives 100 USDC, burning the 100 bUSDC
   * @param asset The address of the underlying asset to withdraw
   * @param amount The underlying amount to be withdrawn
   *   - Send the value type(uint256).max in order to withdraw the whole bToken balance
   * @param to Address that will receive the underlying, same as msg.sender if the user
   *   wants to receive it on his own wallet, or a different address if the beneficiary is a
   *   different wallet
   * @return The final amount withdrawn
   **/
  function withdraw(
    address asset,
    uint256 amount,
    address to
  ) external override nonReentrant whenNotPaused returns (uint256) {
    return
      SupplyLogic.executeWithdraw(
        _reserves,
        DataTypes.ExecuteWithdrawParams({initiator: _msgSender(), asset: asset, amount: amount, to: to})
      );
  }
  /**
   * @dev Allows users to borrow a specific `amount` of the reserve underlying asset
   * - E.g. User borrows 100 USDC, receiving the 100 USDC in his wallet
   *   and lock collateral asset in contract
   * @param asset The address of the underlying asset to borrow
   * @param amount The amount to be borrowed
   * @param nftAsset The address of the underlying nft used as collateral
   * @param nftTokenId The token ID of the underlying nft used as collateral
   * @param onBehalfOf Address of the user who will receive the loan. Should be the address of the borrower itself
   * calling the function if he wants to borrow against his own collateral
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   **/
  function borrow(
    address asset,
    uint256 amount,
    address nftAsset,
    uint256 nftTokenId,
    address onBehalfOf,
    uint16 referralCode
  ) external override nonReentrant whenNotPaused {
    BorrowLogic.executeBorrow(
      _addressesProvider,
      _reserves,
      _nfts,
      DataTypes.ExecuteBorrowParams({
        initiator: _msgSender(),
        asset: asset,
        amount: amount,
        nftAsset: nftAsset,
        nftTokenId: nftTokenId,
        onBehalfOf: onBehalfOf,
        referralCode: referralCode
      })
    );
  }
  function batchBorrow(
    address[] calldata assets,
    uint256[] calldata amounts,
    address[] calldata nftAssets,
    uint256[] calldata nftTokenIds,
    address onBehalfOf,
    uint16 referralCode
  ) external override nonReentrant whenNotPaused {
    DataTypes.ExecuteBatchBorrowParams memory params;
    params.initiator = _msgSender();
    params.assets = assets;
    params.amounts = amounts;
    params.nftAssets = nftAssets;
    params.nftTokenIds = nftTokenIds;
    params.onBehalfOf = onBehalfOf;
    params.referralCode = referralCode;
    BorrowLogic.executeBatchBorrow(_addressesProvider, _reserves, _nfts, params);
  }
  /**
   * @notice Repays a borrowed `amount` on a specific reserve, burning the equivalent loan owned
   * - E.g. User repays 100 USDC, burning loan and receives collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param amount The amount to repay
   **/
  function repay(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount
  ) external override nonReentrant whenNotPaused returns (uint256, bool) {
    return
      BorrowLogic.executeRepay(
        _addressesProvider,
        _reserves,
        _nfts,
        DataTypes.ExecuteRepayParams({
          initiator: _msgSender(),
          nftAsset: nftAsset,
          nftTokenId: nftTokenId,
          amount: amount
        })
      );
  }
  function batchRepay(
    address[] calldata nftAssets,
    uint256[] calldata nftTokenIds,
    uint256[] calldata amounts
  ) external override nonReentrant whenNotPaused returns (uint256[] memory, bool[] memory) {
    return
      BorrowLogic.executeBatchRepay(
        _addressesProvider,
        _reserves,
        _nfts,
        DataTypes.ExecuteBatchRepayParams({
          initiator: _msgSender(),
          nftAssets: nftAssets,
          nftTokenIds: nftTokenIds,
          amounts: amounts
        })
      );
  }
  /**
   * @dev Function to auction a non-healthy position collateral-wise
   * - The bidder want to buy collateral asset of the user getting liquidated
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param bidPrice The bid price of the bidder want to buy underlying NFT
   * @param onBehalfOf Address of the user who will get the underlying NFT, same as msg.sender if the user
   *   wants to receive them on his own wallet, or a different address if the beneficiary of NFT
   *   is a different wallet
   **/
  function auction(
    address nftAsset,
    uint256 nftTokenId,
    uint256 bidPrice,
    address onBehalfOf
  ) external override nonReentrant whenNotPaused {
    LiquidateLogic.executeAuction(
      _addressesProvider,
      _reserves,
      _nfts,
      _buildLendPoolVars(),
      DataTypes.ExecuteAuctionParams({
        initiator: _msgSender(),
        nftAsset: nftAsset,
        nftTokenId: nftTokenId,
        bidPrice: bidPrice,
        onBehalfOf: onBehalfOf
      })
    );
  }
  /**
   * @notice Redeem a NFT loan which state is in Auction
   * - E.g. User repays 100 USDC, burning loan and receives collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param amount The amount to repay the debt
   * @param bidFine The amount of bid fine
   **/
  function redeem(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount,
    uint256 bidFine
  ) external override nonReentrant whenNotPaused returns (uint256) {
    return
      LiquidateLogic.executeRedeem(
        _addressesProvider,
        _reserves,
        _nfts,
        _buildLendPoolVars(),
        DataTypes.ExecuteRedeemParams({
          initiator: _msgSender(),
          nftAsset: nftAsset,
          nftTokenId: nftTokenId,
          amount: amount,
          bidFine: bidFine
        })
      );
  }
  /**
   * @dev Function to liquidate a non-healthy position collateral-wise
   * - The caller (liquidator) buy collateral asset of the user getting liquidated, and receives
   *   the collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   **/
  function liquidate(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount
  ) external override nonReentrant whenNotPaused returns (uint256) {
    return
      LiquidateLogic.executeLiquidate(
        _addressesProvider,
        _reserves,
        _nfts,
        _buildLendPoolVars(),
        DataTypes.ExecuteLiquidateParams({
          initiator: _msgSender(),
          nftAsset: nftAsset,
          nftTokenId: nftTokenId,
          amount: amount
        })
      );
  }
  function onERC721Received(
    address operator,
    address from,
    uint256 tokenId,
    bytes calldata data
  ) external pure override returns (bytes4) {
    operator;
    from;
    tokenId;
    data;
    return IERC721ReceiverUpgradeable.onERC721Received.selector;
  }
  /**
   * @dev Returns the configuration of the reserve
   * @param asset The address of the underlying asset of the reserve
   * @return The configuration of the reserve
   **/
  function getReserveConfiguration(address asset)
    external
    view
    override
    returns (DataTypes.ReserveConfigurationMap memory)
  {
    return _reserves[asset].configuration;
  }
  /**
   * @dev Returns the configuration of the NFT
   * @param asset The address of the asset of the NFT
   * @return The configuration of the NFT
   **/
  function getNftConfiguration(address asset) external view override returns (DataTypes.NftConfigurationMap memory) {
    return _nfts[asset].configuration;
  }
  /**
   * @dev Returns the normalized income normalized income of the reserve
   * @param asset The address of the underlying asset of the reserve
   * @return The reserve's normalized income
   */
  function getReserveNormalizedIncome(address asset) external view override returns (uint256) {
    return _reserves[asset].getNormalizedIncome();
  }
  /**
   * @dev Returns the normalized variable debt per unit of asset
   * @param asset The address of the underlying asset of the reserve
   * @return The reserve normalized variable debt
   */
  function getReserveNormalizedVariableDebt(address asset) external view override returns (uint256) {
    return _reserves[asset].getNormalizedDebt();
  }
  /**
   * @dev Returns the state and configuration of the reserve
   * @param asset The address of the underlying asset of the reserve
   * @return The state of the reserve
   **/
  function getReserveData(address asset) external view override returns (DataTypes.ReserveData memory) {
    return _reserves[asset];
  }
  /**
   * @dev Returns the state and configuration of the nft
   * @param asset The address of the underlying asset of the nft
   * @return The state of the nft
   **/
  function getNftData(address asset) external view override returns (DataTypes.NftData memory) {
    return _nfts[asset];
  }
  /**
   * @dev Returns the loan data of the NFT
   * @param nftAsset The address of the NFT
   * @param reserveAsset The address of the Reserve
   * @return totalCollateralInETH the total collateral in ETH of the NFT
   * @return totalCollateralInReserve the total collateral in Reserve of the NFT
   * @return availableBorrowsInETH the borrowing power in ETH of the NFT
   * @return availableBorrowsInReserve the borrowing power in Reserve of the NFT
   * @return ltv the loan to value of the user
   * @return liquidationThreshold the liquidation threshold of the NFT
   * @return liquidationBonus the liquidation bonus of the NFT
   **/
  function getNftCollateralData(address nftAsset, address reserveAsset)
    external
    view
    override
    returns (
      uint256 totalCollateralInETH,
      uint256 totalCollateralInReserve,
      uint256 availableBorrowsInETH,
      uint256 availableBorrowsInReserve,
      uint256 ltv,
      uint256 liquidationThreshold,
      uint256 liquidationBonus
    )
  {
    DataTypes.NftData storage nftData = _nfts[nftAsset];
    DataTypes.ReserveData storage reserveData = _reserves[reserveAsset];
    (ltv, liquidationThreshold, liquidationBonus) = nftData.configuration.getCollateralParams();
    (totalCollateralInETH, totalCollateralInReserve) = GenericLogic.calculateNftCollateralData(
      reserveAsset,
      reserveData,
      nftAsset,
      nftData,
      _addressesProvider.getReserveOracle(),
      _addressesProvider.getNFTOracle()
    );
    availableBorrowsInETH = GenericLogic.calculateAvailableBorrows(totalCollateralInETH, 0, ltv);
    availableBorrowsInReserve = GenericLogic.calculateAvailableBorrows(totalCollateralInReserve, 0, ltv);
  }
  /**
   * @dev Returns the debt data of the NFT
   * @param nftAsset The address of the NFT
   * @param nftTokenId The token id of the NFT
   * @return loanId the loan id of the NFT
   * @return reserveAsset the address of the Reserve
   * @return totalCollateral the total power of the NFT
   * @return totalDebt the total debt of the NFT
   * @return availableBorrows the borrowing power left of the NFT
   * @return healthFactor the current health factor of the NFT
   **/
  function getNftDebtData(address nftAsset, uint256 nftTokenId)
    external
    view
    override
    returns (
      uint256 loanId,
      address reserveAsset,
      uint256 totalCollateral,
      uint256 totalDebt,
      uint256 availableBorrows,
      uint256 healthFactor
    )
  {
    DataTypes.NftData storage nftData = _nfts[nftAsset];
    (uint256 ltv, uint256 liquidationThreshold, ) = nftData.configuration.getCollateralParams();
    loanId = ILendPoolLoan(_addressesProvider.getLendPoolLoan()).getCollateralLoanId(nftAsset, nftTokenId);
    if (loanId == 0) {
      return (0, address(0), 0, 0, 0, 0);
    }
    DataTypes.LoanData memory loan = ILendPoolLoan(_addressesProvider.getLendPoolLoan()).getLoan(loanId);
    reserveAsset = loan.reserveAsset;
    DataTypes.ReserveData storage reserveData = _reserves[reserveAsset];
    (, totalCollateral) = GenericLogic.calculateNftCollateralData(
      reserveAsset,
      reserveData,
      nftAsset,
      nftData,
      _addressesProvider.getReserveOracle(),
      _addressesProvider.getNFTOracle()
    );
    (, totalDebt) = GenericLogic.calculateNftDebtData(
      reserveAsset,
      reserveData,
      _addressesProvider.getLendPoolLoan(),
      loanId,
      _addressesProvider.getReserveOracle()
    );
    availableBorrows = GenericLogic.calculateAvailableBorrows(totalCollateral, totalDebt, ltv);
    if (loan.state == DataTypes.LoanState.Active) {
      healthFactor = GenericLogic.calculateHealthFactorFromBalances(totalCollateral, totalDebt, liquidationThreshold);
    }
  }
  /**
   * @dev Returns the auction data of the NFT
   * @param nftAsset The address of the NFT
   * @param nftTokenId The token id of the NFT
   * @return loanId the loan id of the NFT
   * @return bidderAddress the highest bidder address of the loan
   * @return bidPrice the highest bid price in Reserve of the loan
   * @return bidBorrowAmount the borrow amount in Reserve of the loan
   * @return bidFine the penalty fine of the loan
   **/
  function getNftAuctionData(address nftAsset, uint256 nftTokenId)
    external
    view
    override
    returns (
      uint256 loanId,
      address bidderAddress,
      uint256 bidPrice,
      uint256 bidBorrowAmount,
      uint256 bidFine
    )
  {
    DataTypes.NftData storage nftData = _nfts[nftAsset];
    ILendPoolLoan poolLoan = ILendPoolLoan(_addressesProvider.getLendPoolLoan());
    loanId = poolLoan.getCollateralLoanId(nftAsset, nftTokenId);
    if (loanId != 0) {
      DataTypes.LoanData memory loan = ILendPoolLoan(_addressesProvider.getLendPoolLoan()).getLoan(loanId);
      DataTypes.ReserveData storage reserveData = _reserves[loan.reserveAsset];
      bidderAddress = loan.bidderAddress;
      bidPrice = loan.bidPrice;
      bidBorrowAmount = loan.bidBorrowAmount;
      (, bidFine) = GenericLogic.calculateLoanBidFine(
        loan.reserveAsset,
        reserveData,
        nftAsset,
        nftData,
        loan,
        address(poolLoan),
        _addressesProvider.getReserveOracle()
      );
    }
  }
  function getNftAuctionEndTime(address nftAsset, uint256 nftTokenId)
    external
    view
    override
    returns (
      uint256 loanId,
      uint256 bidStartTimestamp,
      uint256 bidEndTimestamp,
      uint256 redeemEndTimestamp
    )
  {
    DataTypes.NftData storage nftData = _nfts[nftAsset];
    ILendPoolLoan poolLoan = ILendPoolLoan(_addressesProvider.getLendPoolLoan());
    loanId = poolLoan.getCollateralLoanId(nftAsset, nftTokenId);
    if (loanId != 0) {
      DataTypes.LoanData memory loan = ILendPoolLoan(_addressesProvider.getLendPoolLoan()).getLoan(loanId);
      bidStartTimestamp = loan.bidStartTimestamp;
      if (bidStartTimestamp > 0) {
        (bidEndTimestamp, redeemEndTimestamp) = GenericLogic.calculateLoanAuctionEndTimestamp(
          nftData,
          loan,
          _pauseStartTime,
          _pauseDurationTime
        );
      }
    }
  }
  struct GetLiquidationPriceLocalVars {
    address poolLoan;
    uint256 loanId;
    uint256 thresholdPrice;
    uint256 liquidatePrice;
    uint256 paybackAmount;
    uint256 remainAmount;
  }
  function getNftLiquidatePrice(address nftAsset, uint256 nftTokenId)
    external
    view
    override
    returns (uint256 liquidatePrice, uint256 paybackAmount)
  {
    GetLiquidationPriceLocalVars memory vars;
    vars.poolLoan = _addressesProvider.getLendPoolLoan();
    vars.loanId = ILendPoolLoan(vars.poolLoan).getCollateralLoanId(nftAsset, nftTokenId);
    if (vars.loanId == 0) {
      return (0, 0);
    }
    DataTypes.LoanData memory loanData = ILendPoolLoan(vars.poolLoan).getLoan(vars.loanId);
    DataTypes.ReserveData storage reserveData = _reserves[loanData.reserveAsset];
    DataTypes.NftData storage nftData = _nfts[nftAsset];
    (vars.paybackAmount, vars.thresholdPrice, vars.liquidatePrice) = GenericLogic.calculateLoanLiquidatePrice(
      vars.loanId,
      loanData.reserveAsset,
      reserveData,
      loanData.nftAsset,
      nftData,
      vars.poolLoan,
      _addressesProvider.getReserveOracle(),
      _addressesProvider.getNFTOracle()
    );
    if (vars.liquidatePrice < vars.paybackAmount) {
      vars.liquidatePrice = vars.paybackAmount;
    }
    return (vars.liquidatePrice, vars.paybackAmount);
  }
  /**
   * @dev Validates and finalizes an bToken transfer
   * - Only callable by the overlying bToken of the `asset`
   * @param asset The address of the underlying asset of the bToken
   * @param from The user from which the bToken are transferred
   * @param to The user receiving the bTokens
   * @param amount The amount being transferred/withdrawn
   * @param balanceFromBefore The bToken balance of the `from` user before the transfer
   * @param balanceToBefore The bToken balance of the `to` user before the transfer
   */
  function finalizeTransfer(
    address asset,
    address from,
    address to,
    uint256 amount,
    uint256 balanceFromBefore,
    uint256 balanceToBefore
  ) external view override whenNotPaused {
    asset;
    from;
    to;
    amount;
    balanceFromBefore;
    balanceToBefore;
    DataTypes.ReserveData storage reserve = _reserves[asset];
    require(_msgSender() == reserve.bTokenAddress, Errors.LP_CALLER_MUST_BE_AN_BTOKEN);
    ValidationLogic.validateTransfer(from, reserve);
  }
  /**
   * @dev Returns the list of the initialized reserves
   **/
  function getReservesList() external view override returns (address[] memory) {
    address[] memory _activeReserves = new address[](_reservesCount);
    for (uint256 i = 0; i < _reservesCount; i++) {
      _activeReserves[i] = _reservesList[i];
    }
    return _activeReserves;
  }
  /**
   * @dev Returns the list of the initialized nfts
   **/
  function getNftsList() external view override returns (address[] memory) {
    address[] memory _activeNfts = new address[](_nftsCount);
    for (uint256 i = 0; i < _nftsCount; i++) {
      _activeNfts[i] = _nftsList[i];
    }
    return _activeNfts;
  }
  /**
   * @dev Set the _pause state of the pool
   * - Only callable by the LendPoolConfigurator contract
   * @param val `true` to pause the pool, `false` to un-pause it
   */
  function setPause(bool val) external override onlyLendPoolConfigurator {
    if (_paused != val) {
      _paused = val;
      if (_paused) {
        _pauseStartTime = block.timestamp;
        emit Paused();
      } else {
        _pauseDurationTime = block.timestamp - _pauseStartTime;
        emit Unpaused();
      }
    }
  }
  /**
   * @dev Returns if the LendPool is paused
   */
  function paused() external view override returns (bool) {
    return _paused;
  }
  function setPausedTime(uint256 startTime, uint256 durationTime) external override onlyLendPoolConfigurator {
    _pauseStartTime = startTime;
    _pauseDurationTime = durationTime;
    emit PausedTimeUpdated(startTime, durationTime);
  }
  function getPausedTime() external view override returns (uint256, uint256) {
    return (_pauseStartTime, _pauseDurationTime);
  }
  /**
   * @dev Returns the cached LendPoolAddressesProvider connected to this contract
   **/
  function getAddressesProvider() external view override returns (ILendPoolAddressesProvider) {
    return _addressesProvider;
  }
  function setMaxNumberOfReserves(uint256 val) external override onlyLendPoolConfigurator {
    _maxNumberOfReserves = val;
  }
  /**
   * @dev Returns the maximum number of reserves supported to be listed in this LendPool
   */
  function getMaxNumberOfReserves() public view override returns (uint256) {
    return _maxNumberOfReserves;
  }
  function setMaxNumberOfNfts(uint256 val) external override onlyLendPoolConfigurator {
    _maxNumberOfNfts = val;
  }
  /**
   * @dev Returns the maximum number of nfts supported to be listed in this LendPool
   */
  function getMaxNumberOfNfts() public view override returns (uint256) {
    return _maxNumberOfNfts;
  }
  /**
   * @dev Initializes a reserve, activating it, assigning an bToken and nft loan and an
   * interest rate strategy
   * - Only callable by the LendPoolConfigurator contract
   * @param asset The address of the underlying asset of the reserve
   * @param bTokenAddress The address of the bToken that will be assigned to the reserve
   * @param debtTokenAddress The address of the debtToken that will be assigned to the reserve
   * @param interestRateAddress The address of the interest rate strategy contract
   **/
  function initReserve(
    address asset,
    address bTokenAddress,
    address debtTokenAddress,
    address interestRateAddress
  ) external override onlyLendPoolConfigurator {
    require(AddressUpgradeable.isContract(asset), Errors.LP_NOT_CONTRACT);
    _reserves[asset].init(bTokenAddress, debtTokenAddress, interestRateAddress);
    _addReserveToList(asset);
  }
  /**
   * @dev Initializes a nft, activating it, assigning nft loan and an
   * interest rate strategy
   * - Only callable by the LendPoolConfigurator contract
   * @param asset The address of the underlying asset of the nft
   **/
  function initNft(address asset, address bNftAddress) external override onlyLendPoolConfigurator {
    require(AddressUpgradeable.isContract(asset), Errors.LP_NOT_CONTRACT);
    _nfts[asset].init(bNftAddress);
    _addNftToList(asset);
    require(_addressesProvider.getLendPoolLoan() != address(0), Errors.LPC_INVALIED_LOAN_ADDRESS);
    IERC721Upgradeable(asset).setApprovalForAll(_addressesProvider.getLendPoolLoan(), true);
    ILendPoolLoan(_addressesProvider.getLendPoolLoan()).initNft(asset, bNftAddress);
  }
  /**
   * @dev Updates the address of the interest rate strategy contract
   * - Only callable by the LendPoolConfigurator contract
   * @param asset The address of the underlying asset of the reserve
   * @param rateAddress The address of the interest rate strategy contract
   **/
  function setReserveInterestRateAddress(address asset, address rateAddress)
    external
    override
    onlyLendPoolConfigurator
  {
    _reserves[asset].interestRateAddress = rateAddress;
  }
  /**
   * @dev Sets the configuration bitmap of the reserve as a whole
   * - Only callable by the LendPoolConfigurator contract
   * @param asset The address of the underlying asset of the reserve
   * @param configuration The new configuration bitmap
   **/
  function setReserveConfiguration(address asset, uint256 configuration) external override onlyLendPoolConfigurator {
    _reserves[asset].configuration.data = configuration;
  }
  /**
   * @dev Sets the configuration bitmap of the NFT as a whole
   * - Only callable by the LendPoolConfigurator contract
   * @param asset The address of the asset of the NFT
   * @param configuration The new configuration bitmap
   **/
  function setNftConfiguration(address asset, uint256 configuration) external override onlyLendPoolConfigurator {
    _nfts[asset].configuration.data = configuration;
  }
  function setNftMaxSupplyAndTokenId(
    address asset,
    uint256 maxSupply,
    uint256 maxTokenId
  ) external override onlyLendPoolConfigurator {
    _nfts[asset].maxSupply = maxSupply;
    _nfts[asset].maxTokenId = maxTokenId;
  }
  function _addReserveToList(address asset) internal {
    uint256 reservesCount = _reservesCount;
    require(reservesCount < _maxNumberOfReserves, Errors.LP_NO_MORE_RESERVES_ALLOWED);
    bool reserveAlreadyAdded = _reserves[asset].id != 0 || _reservesList[0] == asset;
    if (!reserveAlreadyAdded) {
      _reserves[asset].id = uint8(reservesCount);
      _reservesList[reservesCount] = asset;
      _reservesCount = reservesCount + 1;
    }
  }
  function _addNftToList(address asset) internal {
    uint256 nftsCount = _nftsCount;
    require(nftsCount < _maxNumberOfNfts, Errors.LP_NO_MORE_NFTS_ALLOWED);
    bool nftAlreadyAdded = _nfts[asset].id != 0 || _nftsList[0] == asset;
    if (!nftAlreadyAdded) {
      _nfts[asset].id = uint8(nftsCount);
      _nftsList[nftsCount] = asset;
      _nftsCount = nftsCount + 1;
    }
  }
  function _verifyCallResult(
    bool success,
    bytes memory returndata,
    string memory errorMessage
  ) internal pure returns (bytes memory) {
    if (success) {
      return returndata;
    } else {
      // Look for revert reason and bubble it up if present
      if (returndata.length > 0) {
        // The easiest way to bubble the revert reason is using memory via assembly
        assembly {
          let returndata_size := mload(returndata)
          revert(add(32, returndata), returndata_size)
        }
      } else {
        revert(errorMessage);
      }
    }
  }
  function _buildLendPoolVars() internal view returns (DataTypes.ExecuteLendPoolStates memory) {
    return DataTypes.ExecuteLendPoolStates({pauseStartTime: _pauseStartTime, pauseDurationTime: _pauseDurationTime});
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {DataTypes} from "../libraries/types/DataTypes.sol";
interface ILendPoolLoan {
  /**
   * @dev Emitted on initialization to share location of dependent notes
   * @param pool The address of the associated lend pool
   */
  event Initialized(address indexed pool);
  /**
   * @dev Emitted when a loan is created
   * @param user The address initiating the action
   */
  event LoanCreated(
    address indexed user,
    address indexed onBehalfOf,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  );
  /**
   * @dev Emitted when a loan is updated
   * @param user The address initiating the action
   */
  event LoanUpdated(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amountAdded,
    uint256 amountTaken,
    uint256 borrowIndex
  );
  /**
   * @dev Emitted when a loan is repaid by the borrower
   * @param user The address initiating the action
   */
  event LoanRepaid(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  );
  /**
   * @dev Emitted when a loan is auction by the liquidator
   * @param user The address initiating the action
   */
  event LoanAuctioned(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount,
    uint256 borrowIndex,
    address bidder,
    uint256 price,
    address previousBidder,
    uint256 previousPrice
  );
  /**
   * @dev Emitted when a loan is redeemed
   * @param user The address initiating the action
   */
  event LoanRedeemed(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amountTaken,
    uint256 borrowIndex
  );
  /**
   * @dev Emitted when a loan is liquidate by the liquidator
   * @param user The address initiating the action
   */
  event LoanLiquidated(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  );
  function initNft(address nftAsset, address bNftAddress) external;
  /**
   * @dev Create store a loan object with some params
   * @param initiator The address of the user initiating the borrow
   * @param onBehalfOf The address receiving the loan
   */
  function createLoan(
    address initiator,
    address onBehalfOf,
    address nftAsset,
    uint256 nftTokenId,
    address bNftAddress,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  ) external returns (uint256);
  /**
   * @dev Update the given loan with some params
   *
   * Requirements:
   *  - The caller must be a holder of the loan
   *  - The loan must be in state Active
   * @param initiator The address of the user initiating the borrow
   */
  function updateLoan(
    address initiator,
    uint256 loanId,
    uint256 amountAdded,
    uint256 amountTaken,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Repay the given loan
   *
   * Requirements:
   *  - The caller must be a holder of the loan
   *  - The caller must send in principal + interest
   *  - The loan must be in state Active
   *
   * @param initiator The address of the user initiating the repay
   * @param loanId The loan getting burned
   * @param bNftAddress The address of bNFT
   */
  function repayLoan(
    address initiator,
    uint256 loanId,
    address bNftAddress,
    uint256 amount,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Auction the given loan
   *
   * Requirements:
   *  - The price must be greater than current highest price
   *  - The loan must be in state Active or Auction
   *
   * @param initiator The address of the user initiating the auction
   * @param loanId The loan getting auctioned
   * @param bidPrice The bid price of this auction
   */
  function auctionLoan(
    address initiator,
    uint256 loanId,
    address onBehalfOf,
    uint256 bidPrice,
    uint256 borrowAmount,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Redeem the given loan with some params
   *
   * Requirements:
   *  - The caller must be a holder of the loan
   *  - The loan must be in state Auction
   * @param initiator The address of the user initiating the borrow
   */
  function redeemLoan(
    address initiator,
    uint256 loanId,
    uint256 amountTaken,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Liquidate the given loan
   *
   * Requirements:
   *  - The caller must send in principal + interest
   *  - The loan must be in state Active
   *
   * @param initiator The address of the user initiating the auction
   * @param loanId The loan getting burned
   * @param bNftAddress The address of bNFT
   */
  function liquidateLoan(
    address initiator,
    uint256 loanId,
    address bNftAddress,
    uint256 borrowAmount,
    uint256 borrowIndex
  ) external;
  function borrowerOf(uint256 loanId) external view returns (address);
  function getCollateralLoanId(address nftAsset, uint256 nftTokenId) external view returns (uint256);
  function getLoan(uint256 loanId) external view returns (DataTypes.LoanData memory loanData);
  function getLoanCollateralAndReserve(uint256 loanId)
    external
    view
    returns (
      address nftAsset,
      uint256 nftTokenId,
      address reserveAsset,
      uint256 scaledAmount
    );
  function getLoanReserveBorrowScaledAmount(uint256 loanId) external view returns (address, uint256);
  function getLoanReserveBorrowAmount(uint256 loanId) external view returns (address, uint256);
  function getLoanHighestBid(uint256 loanId) external view returns (address, uint256);
  function getNftCollateralAmount(address nftAsset) external view returns (uint256);
  function getUserNftCollateralAmount(address user, address nftAsset) external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ILendPoolAddressesProvider} from "./ILendPoolAddressesProvider.sol";
import {DataTypes} from "../libraries/types/DataTypes.sol";
interface ILendPool {
  /**
   * @dev Emitted on deposit()
   * @param user The address initiating the deposit
   * @param amount The amount deposited
   * @param reserve The address of the underlying asset of the reserve
   * @param onBehalfOf The beneficiary of the deposit, receiving the bTokens
   * @param referral The referral code used
   **/
  event Deposit(
    address user,
    address indexed reserve,
    uint256 amount,
    address indexed onBehalfOf,
    uint16 indexed referral
  );
  /**
   * @dev Emitted on withdraw()
   * @param user The address initiating the withdrawal, owner of bTokens
   * @param reserve The address of the underlyng asset being withdrawn
   * @param amount The amount to be withdrawn
   * @param to Address that will receive the underlying
   **/
  event Withdraw(address indexed user, address indexed reserve, uint256 amount, address indexed to);
  /**
   * @dev Emitted on borrow() when loan needs to be opened
   * @param user The address of the user initiating the borrow(), receiving the funds
   * @param reserve The address of the underlying asset being borrowed
   * @param amount The amount borrowed out
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param onBehalfOf The address that will be getting the loan
   * @param referral The referral code used
   **/
  event Borrow(
    address user,
    address indexed reserve,
    uint256 amount,
    address nftAsset,
    uint256 nftTokenId,
    address indexed onBehalfOf,
    uint256 borrowRate,
    uint256 loanId,
    uint16 indexed referral
  );
  /**
   * @dev Emitted on repay()
   * @param user The address of the user initiating the repay(), providing the funds
   * @param reserve The address of the underlying asset of the reserve
   * @param amount The amount repaid
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param borrower The beneficiary of the repayment, getting his debt reduced
   * @param loanId The loan ID of the NFT loans
   **/
  event Repay(
    address user,
    address indexed reserve,
    uint256 amount,
    address indexed nftAsset,
    uint256 nftTokenId,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted when a borrower's loan is auctioned.
   * @param user The address of the user initiating the auction
   * @param reserve The address of the underlying asset of the reserve
   * @param bidPrice The price of the underlying reserve given by the bidder
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param onBehalfOf The address that will be getting the NFT
   * @param loanId The loan ID of the NFT loans
   **/
  event Auction(
    address user,
    address indexed reserve,
    uint256 bidPrice,
    address indexed nftAsset,
    uint256 nftTokenId,
    address onBehalfOf,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted on redeem()
   * @param user The address of the user initiating the redeem(), providing the funds
   * @param reserve The address of the underlying asset of the reserve
   * @param borrowAmount The borrow amount repaid
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param loanId The loan ID of the NFT loans
   **/
  event Redeem(
    address user,
    address indexed reserve,
    uint256 borrowAmount,
    uint256 fineAmount,
    address indexed nftAsset,
    uint256 nftTokenId,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted when a borrower's loan is liquidated.
   * @param user The address of the user initiating the auction
   * @param reserve The address of the underlying asset of the reserve
   * @param repayAmount The amount of reserve repaid by the liquidator
   * @param remainAmount The amount of reserve received by the borrower
   * @param loanId The loan ID of the NFT loans
   **/
  event Liquidate(
    address user,
    address indexed reserve,
    uint256 repayAmount,
    uint256 remainAmount,
    address indexed nftAsset,
    uint256 nftTokenId,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted when the pause is triggered.
   */
  event Paused();
  /**
   * @dev Emitted when the pause is lifted.
   */
  event Unpaused();
  /**
   * @dev Emitted when the pause time is updated.
   */
  event PausedTimeUpdated(uint256 startTime, uint256 durationTime);
  /**
   * @dev Emitted when the state of a reserve is updated. NOTE: This event is actually declared
   * in the ReserveLogic library and emitted in the updateInterestRates() function. Since the function is internal,
   * the event will actually be fired by the LendPool contract. The event is therefore replicated here so it
   * gets added to the LendPool ABI
   * @param reserve The address of the underlying asset of the reserve
   * @param liquidityRate The new liquidity rate
   * @param variableBorrowRate The new variable borrow rate
   * @param liquidityIndex The new liquidity index
   * @param variableBorrowIndex The new variable borrow index
   **/
  event ReserveDataUpdated(
    address indexed reserve,
    uint256 liquidityRate,
    uint256 variableBorrowRate,
    uint256 liquidityIndex,
    uint256 variableBorrowIndex
  );
  /**
   * @dev Deposits an `amount` of underlying asset into the reserve, receiving in return overlying bTokens.
   * - E.g. User deposits 100 USDC and gets in return 100 bUSDC
   * @param reserve The address of the underlying asset to deposit
   * @param amount The amount to be deposited
   * @param onBehalfOf The address that will receive the bTokens, same as msg.sender if the user
   *   wants to receive them on his own wallet, or a different address if the beneficiary of bTokens
   *   is a different wallet
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   **/
  function deposit(
    address reserve,
    uint256 amount,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  /**
   * @dev Withdraws an `amount` of underlying asset from the reserve, burning the equivalent bTokens owned
   * E.g. User has 100 bUSDC, calls withdraw() and receives 100 USDC, burning the 100 bUSDC
   * @param reserve The address of the underlying asset to withdraw
   * @param amount The underlying amount to be withdrawn
   *   - Send the value type(uint256).max in order to withdraw the whole bToken balance
   * @param to Address that will receive the underlying, same as msg.sender if the user
   *   wants to receive it on his own wallet, or a different address if the beneficiary is a
   *   different wallet
   * @return The final amount withdrawn
   **/
  function withdraw(
    address reserve,
    uint256 amount,
    address to
  ) external returns (uint256);
  /**
   * @dev Allows users to borrow a specific `amount` of the reserve underlying asset, provided that the borrower
   * already deposited enough collateral
   * - E.g. User borrows 100 USDC, receiving the 100 USDC in his wallet
   *   and lock collateral asset in contract
   * @param reserveAsset The address of the underlying asset to borrow
   * @param amount The amount to be borrowed
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param onBehalfOf Address of the user who will receive the loan. Should be the address of the borrower itself
   * calling the function if he wants to borrow against his own collateral, or the address of the credit delegator
   * if he has been given credit delegation allowance
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   **/
  function borrow(
    address reserveAsset,
    uint256 amount,
    address nftAsset,
    uint256 nftTokenId,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  function batchBorrow(
    address[] calldata assets,
    uint256[] calldata amounts,
    address[] calldata nftAssets,
    uint256[] calldata nftTokenIds,
    address onBehalfOf,
    uint16 referralCode
  ) external;
  /**
   * @notice Repays a borrowed `amount` on a specific reserve, burning the equivalent loan owned
   * - E.g. User repays 100 USDC, burning loan and receives collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param amount The amount to repay
   * @return The final amount repaid, loan is burned or not
   **/
  function repay(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount
  ) external returns (uint256, bool);
  function batchRepay(
    address[] calldata nftAssets,
    uint256[] calldata nftTokenIds,
    uint256[] calldata amounts
  ) external returns (uint256[] memory, bool[] memory);
  /**
   * @dev Function to auction a non-healthy position collateral-wise
   * - The caller (liquidator) want to buy collateral asset of the user getting liquidated
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param bidPrice The bid price of the liquidator want to buy the underlying NFT
   * @param onBehalfOf Address of the user who will get the underlying NFT, same as msg.sender if the user
   *   wants to receive them on his own wallet, or a different address if the beneficiary of NFT
   *   is a different wallet
   **/
  function auction(
    address nftAsset,
    uint256 nftTokenId,
    uint256 bidPrice,
    address onBehalfOf
  ) external;
  /**
   * @notice Redeem a NFT loan which state is in Auction
   * - E.g. User repays 100 USDC, burning loan and receives collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   * @param amount The amount to repay the debt
   * @param bidFine The amount of bid fine
   **/
  function redeem(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount,
    uint256 bidFine
  ) external returns (uint256);
  /**
   * @dev Function to liquidate a non-healthy position collateral-wise
   * - The caller (liquidator) buy collateral asset of the user getting liquidated, and receives
   *   the collateral asset
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token ID of the underlying NFT used as collateral
   **/
  function liquidate(
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount
  ) external returns (uint256);
  /**
   * @dev Validates and finalizes an bToken transfer
   * - Only callable by the overlying bToken of the `asset`
   * @param asset The address of the underlying asset of the bToken
   * @param from The user from which the bTokens are transferred
   * @param to The user receiving the bTokens
   * @param amount The amount being transferred/withdrawn
   * @param balanceFromBefore The bToken balance of the `from` user before the transfer
   * @param balanceToBefore The bToken balance of the `to` user before the transfer
   */
  function finalizeTransfer(
    address asset,
    address from,
    address to,
    uint256 amount,
    uint256 balanceFromBefore,
    uint256 balanceToBefore
  ) external view;
  function getReserveConfiguration(address asset) external view returns (DataTypes.ReserveConfigurationMap memory);
  function getNftConfiguration(address asset) external view returns (DataTypes.NftConfigurationMap memory);
  /**
   * @dev Returns the normalized income normalized income of the reserve
   * @param asset The address of the underlying asset of the reserve
   * @return The reserve's normalized income
   */
  function getReserveNormalizedIncome(address asset) external view returns (uint256);
  /**
   * @dev Returns the normalized variable debt per unit of asset
   * @param asset The address of the underlying asset of the reserve
   * @return The reserve normalized variable debt
   */
  function getReserveNormalizedVariableDebt(address asset) external view returns (uint256);
  /**
   * @dev Returns the state and configuration of the reserve
   * @param asset The address of the underlying asset of the reserve
   * @return The state of the reserve
   **/
  function getReserveData(address asset) external view returns (DataTypes.ReserveData memory);
  function getReservesList() external view returns (address[] memory);
  function getNftData(address asset) external view returns (DataTypes.NftData memory);
  /**
   * @dev Returns the loan data of the NFT
   * @param nftAsset The address of the NFT
   * @param reserveAsset The address of the Reserve
   * @return totalCollateralInETH the total collateral in ETH of the NFT
   * @return totalCollateralInReserve the total collateral in Reserve of the NFT
   * @return availableBorrowsInETH the borrowing power in ETH of the NFT
   * @return availableBorrowsInReserve the borrowing power in Reserve of the NFT
   * @return ltv the loan to value of the user
   * @return liquidationThreshold the liquidation threshold of the NFT
   * @return liquidationBonus the liquidation bonus of the NFT
   **/
  function getNftCollateralData(address nftAsset, address reserveAsset)
    external
    view
    returns (
      uint256 totalCollateralInETH,
      uint256 totalCollateralInReserve,
      uint256 availableBorrowsInETH,
      uint256 availableBorrowsInReserve,
      uint256 ltv,
      uint256 liquidationThreshold,
      uint256 liquidationBonus
    );
  /**
   * @dev Returns the debt data of the NFT
   * @param nftAsset The address of the NFT
   * @param nftTokenId The token id of the NFT
   * @return loanId the loan id of the NFT
   * @return reserveAsset the address of the Reserve
   * @return totalCollateral the total power of the NFT
   * @return totalDebt the total debt of the NFT
   * @return availableBorrows the borrowing power left of the NFT
   * @return healthFactor the current health factor of the NFT
   **/
  function getNftDebtData(address nftAsset, uint256 nftTokenId)
    external
    view
    returns (
      uint256 loanId,
      address reserveAsset,
      uint256 totalCollateral,
      uint256 totalDebt,
      uint256 availableBorrows,
      uint256 healthFactor
    );
  /**
   * @dev Returns the auction data of the NFT
   * @param nftAsset The address of the NFT
   * @param nftTokenId The token id of the NFT
   * @return loanId the loan id of the NFT
   * @return bidderAddress the highest bidder address of the loan
   * @return bidPrice the highest bid price in Reserve of the loan
   * @return bidBorrowAmount the borrow amount in Reserve of the loan
   * @return bidFine the penalty fine of the loan
   **/
  function getNftAuctionData(address nftAsset, uint256 nftTokenId)
    external
    view
    returns (
      uint256 loanId,
      address bidderAddress,
      uint256 bidPrice,
      uint256 bidBorrowAmount,
      uint256 bidFine
    );
  function getNftAuctionEndTime(address nftAsset, uint256 nftTokenId)
    external
    view
    returns (
      uint256 loanId,
      uint256 bidStartTimestamp,
      uint256 bidEndTimestamp,
      uint256 redeemEndTimestamp
    );
  function getNftLiquidatePrice(address nftAsset, uint256 nftTokenId)
    external
    view
    returns (uint256 liquidatePrice, uint256 paybackAmount);
  function getNftsList() external view returns (address[] memory);
  /**
   * @dev Set the _pause state of a reserve
   * - Only callable by the LendPool contract
   * @param val `true` to pause the reserve, `false` to un-pause it
   */
  function setPause(bool val) external;
  function setPausedTime(uint256 startTime, uint256 durationTime) external;
  /**
   * @dev Returns if the LendPool is paused
   */
  function paused() external view returns (bool);
  function getPausedTime() external view returns (uint256, uint256);
  function getAddressesProvider() external view returns (ILendPoolAddressesProvider);
  function initReserve(
    address asset,
    address bTokenAddress,
    address debtTokenAddress,
    address interestRateAddress
  ) external;
  function initNft(address asset, address bNftAddress) external;
  function setReserveInterestRateAddress(address asset, address rateAddress) external;
  function setReserveConfiguration(address asset, uint256 configuration) external;
  function setNftConfiguration(address asset, uint256 configuration) external;
  function setNftMaxSupplyAndTokenId(
    address asset,
    uint256 maxSupply,
    uint256 maxTokenId
  ) external;
  function setMaxNumberOfReserves(uint256 val) external;
  function setMaxNumberOfNfts(uint256 val) external;
  function getMaxNumberOfReserves() external view returns (uint256);
  function getMaxNumberOfNfts() external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title LendPoolAddressesProvider contract
 * @dev Main registry of addresses part of or connected to the protocol, including permissioned roles
 * - Acting also as factory of proxies and admin of those, so with right to change its implementations
 * - Owned by the Bend Governance
 * @author Bend
 **/
interface ILendPoolAddressesProvider {
  event MarketIdSet(string newMarketId);
  event LendPoolUpdated(address indexed newAddress, bytes encodedCallData);
  event ConfigurationAdminUpdated(address indexed newAddress);
  event EmergencyAdminUpdated(address indexed newAddress);
  event LendPoolConfiguratorUpdated(address indexed newAddress, bytes encodedCallData);
  event ReserveOracleUpdated(address indexed newAddress);
  event NftOracleUpdated(address indexed newAddress);
  event LendPoolLoanUpdated(address indexed newAddress, bytes encodedCallData);
  event ProxyCreated(bytes32 id, address indexed newAddress);
  event AddressSet(bytes32 id, address indexed newAddress, bool hasProxy, bytes encodedCallData);
  event BNFTRegistryUpdated(address indexed newAddress);
  event IncentivesControllerUpdated(address indexed newAddress);
  event UIDataProviderUpdated(address indexed newAddress);
  event BendDataProviderUpdated(address indexed newAddress);
  event WalletBalanceProviderUpdated(address indexed newAddress);
  function getMarketId() external view returns (string memory);
  function setMarketId(string calldata marketId) external;
  function setAddress(bytes32 id, address newAddress) external;
  function setAddressAsProxy(
    bytes32 id,
    address impl,
    bytes memory encodedCallData
  ) external;
  function getAddress(bytes32 id) external view returns (address);
  function getLendPool() external view returns (address);
  function setLendPoolImpl(address pool, bytes memory encodedCallData) external;
  function getLendPoolConfigurator() external view returns (address);
  function setLendPoolConfiguratorImpl(address configurator, bytes memory encodedCallData) external;
  function getPoolAdmin() external view returns (address);
  function setPoolAdmin(address admin) external;
  function getEmergencyAdmin() external view returns (address);
  function setEmergencyAdmin(address admin) external;
  function getReserveOracle() external view returns (address);
  function setReserveOracle(address reserveOracle) external;
  function getNFTOracle() external view returns (address);
  function setNFTOracle(address nftOracle) external;
  function getLendPoolLoan() external view returns (address);
  function setLendPoolLoanImpl(address loan, bytes memory encodedCallData) external;
  function getBNFTRegistry() external view returns (address);
  function setBNFTRegistry(address factory) external;
  function getIncentivesController() external view returns (address);
  function setIncentivesController(address controller) external;
  function getUIDataProvider() external view returns (address);
  function setUIDataProvider(address provider) external;
  function getBendDataProvider() external view returns (address);
  function setBendDataProvider(address provider) external;
  function getWalletBalanceProvider() external view returns (address);
  function setWalletBalanceProvider(address provider) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title Errors library
 * @author Bend
 * @notice Defines the error messages emitted by the different contracts of the Bend protocol
 */
library Errors {
  enum ReturnCode {
    SUCCESS,
    FAILED
  }
  string public constant SUCCESS = "0";
  //common errors
  string public constant CALLER_NOT_POOL_ADMIN = "100"; // 'The caller must be the pool admin'
  string public constant CALLER_NOT_ADDRESS_PROVIDER = "101";
  string public constant INVALID_FROM_BALANCE_AFTER_TRANSFER = "102";
  string public constant INVALID_TO_BALANCE_AFTER_TRANSFER = "103";
  string public constant CALLER_NOT_ONBEHALFOF_OR_IN_WHITELIST = "104";
  //math library erros
  string public constant MATH_MULTIPLICATION_OVERFLOW = "200";
  string public constant MATH_ADDITION_OVERFLOW = "201";
  string public constant MATH_DIVISION_BY_ZERO = "202";
  //validation & check errors
  string public constant VL_INVALID_AMOUNT = "301"; // 'Amount must be greater than 0'
  string public constant VL_NO_ACTIVE_RESERVE = "302"; // 'Action requires an active reserve'
  string public constant VL_RESERVE_FROZEN = "303"; // 'Action cannot be performed because the reserve is frozen'
  string public constant VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE = "304"; // 'User cannot withdraw more than the available balance'
  string public constant VL_BORROWING_NOT_ENABLED = "305"; // 'Borrowing is not enabled'
  string public constant VL_COLLATERAL_BALANCE_IS_0 = "306"; // 'The collateral balance is 0'
  string public constant VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD = "307"; // 'Health factor is lesser than the liquidation threshold'
  string public constant VL_COLLATERAL_CANNOT_COVER_NEW_BORROW = "308"; // 'There is not enough collateral to cover a new borrow'
  string public constant VL_NO_DEBT_OF_SELECTED_TYPE = "309"; // 'for repayment of stable debt, the user needs to have stable debt, otherwise, he needs to have variable debt'
  string public constant VL_NO_ACTIVE_NFT = "310";
  string public constant VL_NFT_FROZEN = "311";
  string public constant VL_SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER = "312"; // 'User did not borrow the specified currency'
  string public constant VL_INVALID_HEALTH_FACTOR = "313";
  string public constant VL_INVALID_ONBEHALFOF_ADDRESS = "314";
  string public constant VL_INVALID_TARGET_ADDRESS = "315";
  string public constant VL_INVALID_RESERVE_ADDRESS = "316";
  string public constant VL_SPECIFIED_LOAN_NOT_BORROWED_BY_USER = "317";
  string public constant VL_SPECIFIED_RESERVE_NOT_BORROWED_BY_USER = "318";
  string public constant VL_HEALTH_FACTOR_HIGHER_THAN_LIQUIDATION_THRESHOLD = "319";
  //lend pool errors
  string public constant LP_CALLER_NOT_LEND_POOL_CONFIGURATOR = "400"; // 'The caller of the function is not the lending pool configurator'
  string public constant LP_IS_PAUSED = "401"; // 'Pool is paused'
  string public constant LP_NO_MORE_RESERVES_ALLOWED = "402";
  string public constant LP_NOT_CONTRACT = "403";
  string public constant LP_BORROW_NOT_EXCEED_LIQUIDATION_THRESHOLD = "404";
  string public constant LP_BORROW_IS_EXCEED_LIQUIDATION_PRICE = "405";
  string public constant LP_NO_MORE_NFTS_ALLOWED = "406";
  string public constant LP_INVALIED_USER_NFT_AMOUNT = "407";
  string public constant LP_INCONSISTENT_PARAMS = "408";
  string public constant LP_NFT_IS_NOT_USED_AS_COLLATERAL = "409";
  string public constant LP_CALLER_MUST_BE_AN_BTOKEN = "410";
  string public constant LP_INVALIED_NFT_AMOUNT = "411";
  string public constant LP_NFT_HAS_USED_AS_COLLATERAL = "412";
  string public constant LP_DELEGATE_CALL_FAILED = "413";
  string public constant LP_AMOUNT_LESS_THAN_EXTRA_DEBT = "414";
  string public constant LP_AMOUNT_LESS_THAN_REDEEM_THRESHOLD = "415";
  string public constant LP_AMOUNT_GREATER_THAN_MAX_REPAY = "416";
  string public constant LP_NFT_TOKEN_ID_EXCEED_MAX_LIMIT = "417";
  string public constant LP_NFT_SUPPLY_NUM_EXCEED_MAX_LIMIT = "418";
  //lend pool loan errors
  string public constant LPL_INVALID_LOAN_STATE = "480";
  string public constant LPL_INVALID_LOAN_AMOUNT = "481";
  string public constant LPL_INVALID_TAKEN_AMOUNT = "482";
  string public constant LPL_AMOUNT_OVERFLOW = "483";
  string public constant LPL_BID_PRICE_LESS_THAN_LIQUIDATION_PRICE = "484";
  string public constant LPL_BID_PRICE_LESS_THAN_HIGHEST_PRICE = "485";
  string public constant LPL_BID_REDEEM_DURATION_HAS_END = "486";
  string public constant LPL_BID_USER_NOT_SAME = "487";
  string public constant LPL_BID_REPAY_AMOUNT_NOT_ENOUGH = "488";
  string public constant LPL_BID_AUCTION_DURATION_HAS_END = "489";
  string public constant LPL_BID_AUCTION_DURATION_NOT_END = "490";
  string public constant LPL_BID_PRICE_LESS_THAN_BORROW = "491";
  string public constant LPL_INVALID_BIDDER_ADDRESS = "492";
  string public constant LPL_AMOUNT_LESS_THAN_BID_FINE = "493";
  string public constant LPL_INVALID_BID_FINE = "494";
  //common token errors
  string public constant CT_CALLER_MUST_BE_LEND_POOL = "500"; // 'The caller of this function must be a lending pool'
  string public constant CT_INVALID_MINT_AMOUNT = "501"; //invalid amount to mint
  string public constant CT_INVALID_BURN_AMOUNT = "502"; //invalid amount to burn
  string public constant CT_BORROW_ALLOWANCE_NOT_ENOUGH = "503";
  //reserve logic errors
  string public constant RL_RESERVE_ALREADY_INITIALIZED = "601"; // 'Reserve has already been initialized'
  string public constant RL_LIQUIDITY_INDEX_OVERFLOW = "602"; //  Liquidity index overflows uint128
  string public constant RL_VARIABLE_BORROW_INDEX_OVERFLOW = "603"; //  Variable borrow index overflows uint128
  string public constant RL_LIQUIDITY_RATE_OVERFLOW = "604"; //  Liquidity rate overflows uint128
  string public constant RL_VARIABLE_BORROW_RATE_OVERFLOW = "605"; //  Variable borrow rate overflows uint128
  //configure errors
  string public constant LPC_RESERVE_LIQUIDITY_NOT_0 = "700"; // 'The liquidity of the reserve needs to be 0'
  string public constant LPC_INVALID_CONFIGURATION = "701"; // 'Invalid risk parameters for the reserve'
  string public constant LPC_CALLER_NOT_EMERGENCY_ADMIN = "702"; // 'The caller must be the emergency admin'
  string public constant LPC_INVALIED_BNFT_ADDRESS = "703";
  string public constant LPC_INVALIED_LOAN_ADDRESS = "704";
  string public constant LPC_NFT_LIQUIDITY_NOT_0 = "705";
  //reserve config errors
  string public constant RC_INVALID_LTV = "730";
  string public constant RC_INVALID_LIQ_THRESHOLD = "731";
  string public constant RC_INVALID_LIQ_BONUS = "732";
  string public constant RC_INVALID_DECIMALS = "733";
  string public constant RC_INVALID_RESERVE_FACTOR = "734";
  string public constant RC_INVALID_REDEEM_DURATION = "735";
  string public constant RC_INVALID_AUCTION_DURATION = "736";
  string public constant RC_INVALID_REDEEM_FINE = "737";
  string public constant RC_INVALID_REDEEM_THRESHOLD = "738";
  string public constant RC_INVALID_MIN_BID_FINE = "739";
  string public constant RC_INVALID_MAX_BID_FINE = "740";
  //address provider erros
  string public constant LPAPR_PROVIDER_NOT_REGISTERED = "760"; // 'Provider is not registered'
  string public constant LPAPR_INVALID_ADDRESSES_PROVIDER_ID = "761";
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {Errors} from "../helpers/Errors.sol";
/**
 * @title WadRayMath library
 * @author Bend
 * @dev Provides mul and div function for wads (decimal numbers with 18 digits precision) and rays (decimals with 27 digits)
 **/
library WadRayMath {
  uint256 internal constant WAD = 1e18;
  uint256 internal constant HALF_WAD = WAD / 2;
  uint256 internal constant RAY = 1e27;
  uint256 internal constant HALF_RAY = RAY / 2;
  uint256 internal constant WAD_RAY_RATIO = 1e9;
  /**
   * @return One ray, 1e27
   **/
  function ray() internal pure returns (uint256) {
    return RAY;
  }
  /**
   * @return One wad, 1e18
   **/
  function wad() internal pure returns (uint256) {
    return WAD;
  }
  /**
   * @return Half ray, 1e27/2
   **/
  function halfRay() internal pure returns (uint256) {
    return HALF_RAY;
  }
  /**
   * @return Half ray, 1e18/2
   **/
  function halfWad() internal pure returns (uint256) {
    return HALF_WAD;
  }
  /**
   * @dev Multiplies two wad, rounding half up to the nearest wad
   * @param a Wad
   * @param b Wad
   * @return The result of a*b, in wad
   **/
  function wadMul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0 || b == 0) {
      return 0;
    }
    require(a <= (type(uint256).max - HALF_WAD) / b, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (a * b + HALF_WAD) / WAD;
  }
  /**
   * @dev Divides two wad, rounding half up to the nearest wad
   * @param a Wad
   * @param b Wad
   * @return The result of a/b, in wad
   **/
  function wadDiv(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0, Errors.MATH_DIVISION_BY_ZERO);
    uint256 halfB = b / 2;
    require(a <= (type(uint256).max - halfB) / WAD, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (a * WAD + halfB) / b;
  }
  /**
   * @dev Multiplies two ray, rounding half up to the nearest ray
   * @param a Ray
   * @param b Ray
   * @return The result of a*b, in ray
   **/
  function rayMul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0 || b == 0) {
      return 0;
    }
    require(a <= (type(uint256).max - HALF_RAY) / b, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (a * b + HALF_RAY) / RAY;
  }
  /**
   * @dev Divides two ray, rounding half up to the nearest ray
   * @param a Ray
   * @param b Ray
   * @return The result of a/b, in ray
   **/
  function rayDiv(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0, Errors.MATH_DIVISION_BY_ZERO);
    uint256 halfB = b / 2;
    require(a <= (type(uint256).max - halfB) / RAY, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (a * RAY + halfB) / b;
  }
  /**
   * @dev Casts ray down to wad
   * @param a Ray
   * @return a casted to wad, rounded half up to the nearest wad
   **/
  function rayToWad(uint256 a) internal pure returns (uint256) {
    uint256 halfRatio = WAD_RAY_RATIO / 2;
    uint256 result = halfRatio + a;
    require(result >= halfRatio, Errors.MATH_ADDITION_OVERFLOW);
    return result / WAD_RAY_RATIO;
  }
  /**
   * @dev Converts wad up to ray
   * @param a Wad
   * @return a converted in ray
   **/
  function wadToRay(uint256 a) internal pure returns (uint256) {
    uint256 result = a * WAD_RAY_RATIO;
    require(result / WAD_RAY_RATIO == a, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return result;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ILendPoolLoan} from "../../interfaces/ILendPoolLoan.sol";
import {IReserveOracleGetter} from "../../interfaces/IReserveOracleGetter.sol";
import {INFTOracleGetter} from "../../interfaces/INFTOracleGetter.sol";
import {WadRayMath} from "../math/WadRayMath.sol";
import {PercentageMath} from "../math/PercentageMath.sol";
import {ReserveConfiguration} from "../configuration/ReserveConfiguration.sol";
import {NftConfiguration} from "../configuration/NftConfiguration.sol";
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
import {ReserveLogic} from "./ReserveLogic.sol";
/**
 * @title GenericLogic library
 * @author Bend
 * @notice Implements protocol-level logic to calculate and validate the state of a user
 */
library GenericLogic {
  using ReserveLogic for DataTypes.ReserveData;
  using WadRayMath for uint256;
  using PercentageMath for uint256;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  using NftConfiguration for DataTypes.NftConfigurationMap;
  uint256 public constant HEALTH_FACTOR_LIQUIDATION_THRESHOLD = 1 ether;
  struct CalculateLoanDataVars {
    uint256 reserveUnitPrice;
    uint256 reserveUnit;
    uint256 reserveDecimals;
    uint256 healthFactor;
    uint256 totalCollateralInETH;
    uint256 totalCollateralInReserve;
    uint256 totalDebtInETH;
    uint256 totalDebtInReserve;
    uint256 nftLtv;
    uint256 nftLiquidationThreshold;
    address nftAsset;
    uint256 nftTokenId;
    uint256 nftUnitPrice;
  }
  /**
   * @dev Calculates the nft loan data.
   * this includes the total collateral/borrow balances in Reserve,
   * the Loan To Value, the Liquidation Ratio, and the Health factor.
   * @param reserveData Data of the reserve
   * @param nftData Data of the nft
   * @param reserveOracle The price oracle address of reserve
   * @param nftOracle The price oracle address of nft
   * @return The total collateral and total debt of the loan in Reserve, the ltv, liquidation threshold and the HF
   **/
  function calculateLoanData(
    address reserveAddress,
    DataTypes.ReserveData storage reserveData,
    address nftAddress,
    DataTypes.NftData storage nftData,
    address loanAddress,
    uint256 loanId,
    address reserveOracle,
    address nftOracle
  )
    internal
    view
    returns (
      uint256,
      uint256,
      uint256
    )
  {
    CalculateLoanDataVars memory vars;
    (vars.nftLtv, vars.nftLiquidationThreshold, ) = nftData.configuration.getCollateralParams();
    // calculate total borrow balance for the loan
    if (loanId != 0) {
      (vars.totalDebtInETH, vars.totalDebtInReserve) = calculateNftDebtData(
        reserveAddress,
        reserveData,
        loanAddress,
        loanId,
        reserveOracle
      );
    }
    // calculate total collateral balance for the nft
    (vars.totalCollateralInETH, vars.totalCollateralInReserve) = calculateNftCollateralData(
      reserveAddress,
      reserveData,
      nftAddress,
      nftData,
      reserveOracle,
      nftOracle
    );
    // calculate health by borrow and collateral
    vars.healthFactor = calculateHealthFactorFromBalances(
      vars.totalCollateralInReserve,
      vars.totalDebtInReserve,
      vars.nftLiquidationThreshold
    );
    return (vars.totalCollateralInReserve, vars.totalDebtInReserve, vars.healthFactor);
  }
  function calculateNftDebtData(
    address reserveAddress,
    DataTypes.ReserveData storage reserveData,
    address loanAddress,
    uint256 loanId,
    address reserveOracle
  ) internal view returns (uint256, uint256) {
    CalculateLoanDataVars memory vars;
    // all asset price has converted to ETH based, unit is in WEI (18 decimals)
    vars.reserveDecimals = reserveData.configuration.getDecimals();
    vars.reserveUnit = 10**vars.reserveDecimals;
    vars.reserveUnitPrice = IReserveOracleGetter(reserveOracle).getAssetPrice(reserveAddress);
    (, vars.totalDebtInReserve) = ILendPoolLoan(loanAddress).getLoanReserveBorrowAmount(loanId);
    vars.totalDebtInETH = (vars.totalDebtInReserve * vars.reserveUnitPrice) / vars.reserveUnit;
    return (vars.totalDebtInETH, vars.totalDebtInReserve);
  }
  function calculateNftCollateralData(
    address reserveAddress,
    DataTypes.ReserveData storage reserveData,
    address nftAddress,
    DataTypes.NftData storage nftData,
    address reserveOracle,
    address nftOracle
  ) internal view returns (uint256, uint256) {
    reserveData;
    nftData;
    CalculateLoanDataVars memory vars;
    // calculate total collateral balance for the nft
    // all asset price has converted to ETH based, unit is in WEI (18 decimals)
    vars.nftUnitPrice = INFTOracleGetter(nftOracle).getAssetPrice(nftAddress);
    vars.totalCollateralInETH = vars.nftUnitPrice;
    if (reserveAddress != address(0)) {
      vars.reserveDecimals = reserveData.configuration.getDecimals();
      vars.reserveUnit = 10**vars.reserveDecimals;
      vars.reserveUnitPrice = IReserveOracleGetter(reserveOracle).getAssetPrice(reserveAddress);
      vars.totalCollateralInReserve = (vars.totalCollateralInETH * vars.reserveUnit) / vars.reserveUnitPrice;
    }
    return (vars.totalCollateralInETH, vars.totalCollateralInReserve);
  }
  /**
   * @dev Calculates the health factor from the corresponding balances
   * @param totalCollateral The total collateral
   * @param totalDebt The total debt
   * @param liquidationThreshold The avg liquidation threshold
   * @return The health factor calculated from the balances provided
   **/
  function calculateHealthFactorFromBalances(
    uint256 totalCollateral,
    uint256 totalDebt,
    uint256 liquidationThreshold
  ) internal pure returns (uint256) {
    if (totalDebt == 0) return type(uint256).max;
    return (totalCollateral.percentMul(liquidationThreshold)).wadDiv(totalDebt);
  }
  /**
   * @dev Calculates the equivalent amount that an user can borrow, depending on the available collateral and the
   * average Loan To Value
   * @param totalCollateral The total collateral
   * @param totalDebt The total borrow balance
   * @param ltv The average loan to value
   * @return the amount available to borrow for the user
   **/
  function calculateAvailableBorrows(
    uint256 totalCollateral,
    uint256 totalDebt,
    uint256 ltv
  ) internal pure returns (uint256) {
    uint256 availableBorrows = totalCollateral.percentMul(ltv);
    if (availableBorrows < totalDebt) {
      return 0;
    }
    availableBorrows = availableBorrows - totalDebt;
    return availableBorrows;
  }
  struct CalcLiquidatePriceLocalVars {
    uint256 ltv;
    uint256 liquidationThreshold;
    uint256 liquidationBonus;
    uint256 nftPriceInETH;
    uint256 nftPriceInReserve;
    uint256 reserveDecimals;
    uint256 reservePriceInETH;
    uint256 thresholdPrice;
    uint256 liquidatePrice;
    uint256 borrowAmount;
  }
  function calculateLoanLiquidatePrice(
    uint256 loanId,
    address reserveAsset,
    DataTypes.ReserveData storage reserveData,
    address nftAsset,
    DataTypes.NftData storage nftData,
    address poolLoan,
    address reserveOracle,
    address nftOracle
  )
    internal
    view
    returns (
      uint256,
      uint256,
      uint256
    )
  {
    CalcLiquidatePriceLocalVars memory vars;
    /*
     * 0                   CR                  LH                  100
     * |___________________|___________________|___________________|
     *  <       Borrowing with Interest        <
     * CR: Callteral Ratio;
     * LH: Liquidate Threshold;
     * Liquidate Trigger: Borrowing with Interest > thresholdPrice;
     * Liquidate Price: (100% - BonusRatio) * NFT Price;
     */
    vars.reserveDecimals = reserveData.configuration.getDecimals();
    (, vars.borrowAmount) = ILendPoolLoan(poolLoan).getLoanReserveBorrowAmount(loanId);
    (vars.ltv, vars.liquidationThreshold, vars.liquidationBonus) = nftData.configuration.getCollateralParams();
    vars.nftPriceInETH = INFTOracleGetter(nftOracle).getAssetPrice(nftAsset);
    vars.reservePriceInETH = IReserveOracleGetter(reserveOracle).getAssetPrice(reserveAsset);
    vars.nftPriceInReserve = ((10**vars.reserveDecimals) * vars.nftPriceInETH) / vars.reservePriceInETH;
    vars.thresholdPrice = vars.nftPriceInReserve.percentMul(vars.liquidationThreshold);
    vars.liquidatePrice = vars.nftPriceInReserve.percentMul(PercentageMath.PERCENTAGE_FACTOR - vars.liquidationBonus);
    return (vars.borrowAmount, vars.thresholdPrice, vars.liquidatePrice);
  }
  struct CalcLoanBidFineLocalVars {
    uint256 reserveDecimals;
    uint256 reservePriceInETH;
    uint256 baseBidFineInReserve;
    uint256 minBidFinePct;
    uint256 minBidFineInReserve;
    uint256 bidFineInReserve;
    uint256 debtAmount;
  }
  function calculateLoanBidFine(
    address reserveAsset,
    DataTypes.ReserveData storage reserveData,
    address nftAsset,
    DataTypes.NftData storage nftData,
    DataTypes.LoanData memory loanData,
    address poolLoan,
    address reserveOracle
  ) internal view returns (uint256, uint256) {
    nftAsset;
    if (loanData.bidPrice == 0) {
      return (0, 0);
    }
    CalcLoanBidFineLocalVars memory vars;
    vars.reserveDecimals = reserveData.configuration.getDecimals();
    vars.reservePriceInETH = IReserveOracleGetter(reserveOracle).getAssetPrice(reserveAsset);
    vars.baseBidFineInReserve = (1 ether * 10**vars.reserveDecimals) / vars.reservePriceInETH;
    vars.minBidFinePct = nftData.configuration.getMinBidFine();
    vars.minBidFineInReserve = vars.baseBidFineInReserve.percentMul(vars.minBidFinePct);
    (, vars.debtAmount) = ILendPoolLoan(poolLoan).getLoanReserveBorrowAmount(loanData.loanId);
    vars.bidFineInReserve = vars.debtAmount.percentMul(nftData.configuration.getRedeemFine());
    if (vars.bidFineInReserve < vars.minBidFineInReserve) {
      vars.bidFineInReserve = vars.minBidFineInReserve;
    }
    return (vars.minBidFineInReserve, vars.bidFineInReserve);
  }
  function calculateLoanAuctionEndTimestamp(
    DataTypes.NftData storage nftData,
    DataTypes.LoanData memory loanData,
    uint256 pauseStartTime,
    uint256 pauseDurationTime
  ) internal view returns (uint256 auctionEndTimestamp, uint256 redeemEndTimestamp) {
    uint256 extraDuration = 0;
    if ((pauseDurationTime > 0) && (loanData.bidStartTimestamp <= pauseStartTime)) {
      extraDuration = pauseDurationTime;
    }
    auctionEndTimestamp =
      loanData.bidStartTimestamp +
      extraDuration +
      (nftData.configuration.getAuctionDuration() * 1 hours);
    redeemEndTimestamp =
      loanData.bidStartTimestamp +
      extraDuration +
      (nftData.configuration.getRedeemDuration() * 1 hours);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {Errors} from "../helpers/Errors.sol";
/**
 * @title PercentageMath library
 * @author Bend
 * @notice Provides functions to perform percentage calculations
 * @dev Percentages are defined by default with 2 decimals of precision (100.00). The precision is indicated by PERCENTAGE_FACTOR
 * @dev Operations are rounded half up
 **/
library PercentageMath {
  uint256 constant PERCENTAGE_FACTOR = 1e4; //percentage plus two decimals
  uint256 constant HALF_PERCENT = PERCENTAGE_FACTOR / 2;
  uint256 constant ONE_PERCENT = 1e2; //100, 1%
  uint256 constant TEN_PERCENT = 1e3; //1000, 10%
  uint256 constant ONE_THOUSANDTH_PERCENT = 1e1; //10, 0.1%
  uint256 constant ONE_TEN_THOUSANDTH_PERCENT = 1; //1, 0.01%
  /**
   * @dev Executes a percentage multiplication
   * @param value The value of which the percentage needs to be calculated
   * @param percentage The percentage of the value to be calculated
   * @return The percentage of value
   **/
  function percentMul(uint256 value, uint256 percentage) internal pure returns (uint256) {
    if (value == 0 || percentage == 0) {
      return 0;
    }
    require(value <= (type(uint256).max - HALF_PERCENT) / percentage, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (value * percentage + HALF_PERCENT) / PERCENTAGE_FACTOR;
  }
  /**
   * @dev Executes a percentage division
   * @param value The value of which the percentage needs to be calculated
   * @param percentage The percentage of the value to be calculated
   * @return The value divided the percentage
   **/
  function percentDiv(uint256 value, uint256 percentage) internal pure returns (uint256) {
    require(percentage != 0, Errors.MATH_DIVISION_BY_ZERO);
    uint256 halfPercentage = percentage / 2;
    require(value <= (type(uint256).max - halfPercentage) / PERCENTAGE_FACTOR, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (value * PERCENTAGE_FACTOR + halfPercentage) / percentage;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IBToken} from "../../interfaces/IBToken.sol";
import {IDebtToken} from "../../interfaces/IDebtToken.sol";
import {IInterestRate} from "../../interfaces/IInterestRate.sol";
import {ReserveConfiguration} from "../configuration/ReserveConfiguration.sol";
import {MathUtils} from "../math/MathUtils.sol";
import {WadRayMath} from "../math/WadRayMath.sol";
import {PercentageMath} from "../math/PercentageMath.sol";
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
/**
 * @title ReserveLogic library
 * @author Bend
 * @notice Implements the logic to update the reserves state
 */
library ReserveLogic {
  using WadRayMath for uint256;
  using PercentageMath for uint256;
  using SafeERC20Upgradeable for IERC20Upgradeable;
  /**
   * @dev Emitted when the state of a reserve is updated
   * @param asset The address of the underlying asset of the reserve
   * @param liquidityRate The new liquidity rate
   * @param variableBorrowRate The new variable borrow rate
   * @param liquidityIndex The new liquidity index
   * @param variableBorrowIndex The new variable borrow index
   **/
  event ReserveDataUpdated(
    address indexed asset,
    uint256 liquidityRate,
    uint256 variableBorrowRate,
    uint256 liquidityIndex,
    uint256 variableBorrowIndex
  );
  using ReserveLogic for DataTypes.ReserveData;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  /**
   * @dev Returns the ongoing normalized income for the reserve
   * A value of 1e27 means there is no income. As time passes, the income is accrued
   * A value of 2*1e27 means for each unit of asset one unit of income has been accrued
   * @param reserve The reserve object
   * @return the normalized income. expressed in ray
   **/
  function getNormalizedIncome(DataTypes.ReserveData storage reserve) internal view returns (uint256) {
    uint40 timestamp = reserve.lastUpdateTimestamp;
    //solium-disable-next-line
    if (timestamp == uint40(block.timestamp)) {
      //if the index was updated in the same block, no need to perform any calculation
      return reserve.liquidityIndex;
    }
    uint256 cumulated = MathUtils.calculateLinearInterest(reserve.currentLiquidityRate, timestamp).rayMul(
      reserve.liquidityIndex
    );
    return cumulated;
  }
  /**
   * @dev Returns the ongoing normalized variable debt for the reserve
   * A value of 1e27 means there is no debt. As time passes, the income is accrued
   * A value of 2*1e27 means that for each unit of debt, one unit worth of interest has been accumulated
   * @param reserve The reserve object
   * @return The normalized variable debt. expressed in ray
   **/
  function getNormalizedDebt(DataTypes.ReserveData storage reserve) internal view returns (uint256) {
    uint40 timestamp = reserve.lastUpdateTimestamp;
    //solium-disable-next-line
    if (timestamp == uint40(block.timestamp)) {
      //if the index was updated in the same block, no need to perform any calculation
      return reserve.variableBorrowIndex;
    }
    uint256 cumulated = MathUtils.calculateCompoundedInterest(reserve.currentVariableBorrowRate, timestamp).rayMul(
      reserve.variableBorrowIndex
    );
    return cumulated;
  }
  /**
   * @dev Updates the liquidity cumulative index and the variable borrow index.
   * @param reserve the reserve object
   **/
  function updateState(DataTypes.ReserveData storage reserve) internal {
    uint256 scaledVariableDebt = IDebtToken(reserve.debtTokenAddress).scaledTotalSupply();
    uint256 previousVariableBorrowIndex = reserve.variableBorrowIndex;
    uint256 previousLiquidityIndex = reserve.liquidityIndex;
    uint40 lastUpdatedTimestamp = reserve.lastUpdateTimestamp;
    (uint256 newLiquidityIndex, uint256 newVariableBorrowIndex) = _updateIndexes(
      reserve,
      scaledVariableDebt,
      previousLiquidityIndex,
      previousVariableBorrowIndex,
      lastUpdatedTimestamp
    );
    _mintToTreasury(
      reserve,
      scaledVariableDebt,
      previousVariableBorrowIndex,
      newLiquidityIndex,
      newVariableBorrowIndex,
      lastUpdatedTimestamp
    );
  }
  /**
   * @dev Accumulates a predefined amount of asset to the reserve as a fixed, instantaneous income. Used for example to accumulate
   * the flashloan fee to the reserve, and spread it between all the depositors
   * @param reserve The reserve object
   * @param totalLiquidity The total liquidity available in the reserve
   * @param amount The amount to accomulate
   **/
  function cumulateToLiquidityIndex(
    DataTypes.ReserveData storage reserve,
    uint256 totalLiquidity,
    uint256 amount
  ) internal {
    uint256 amountToLiquidityRatio = amount.wadToRay().rayDiv(totalLiquidity.wadToRay());
    uint256 result = amountToLiquidityRatio + (WadRayMath.ray());
    result = result.rayMul(reserve.liquidityIndex);
    require(result <= type(uint128).max, Errors.RL_LIQUIDITY_INDEX_OVERFLOW);
    reserve.liquidityIndex = uint128(result);
  }
  /**
   * @dev Initializes a reserve
   * @param reserve The reserve object
   * @param bTokenAddress The address of the overlying bToken contract
   * @param debtTokenAddress The address of the overlying debtToken contract
   * @param interestRateAddress The address of the interest rate strategy contract
   **/
  function init(
    DataTypes.ReserveData storage reserve,
    address bTokenAddress,
    address debtTokenAddress,
    address interestRateAddress
  ) external {
    require(reserve.bTokenAddress == address(0), Errors.RL_RESERVE_ALREADY_INITIALIZED);
    reserve.liquidityIndex = uint128(WadRayMath.ray());
    reserve.variableBorrowIndex = uint128(WadRayMath.ray());
    reserve.bTokenAddress = bTokenAddress;
    reserve.debtTokenAddress = debtTokenAddress;
    reserve.interestRateAddress = interestRateAddress;
  }
  struct UpdateInterestRatesLocalVars {
    uint256 availableLiquidity;
    uint256 newLiquidityRate;
    uint256 newVariableRate;
    uint256 totalVariableDebt;
  }
  /**
   * @dev Updates the reserve current stable borrow rate, the current variable borrow rate and the current liquidity rate
   * @param reserve The address of the reserve to be updated
   * @param liquidityAdded The amount of liquidity added to the protocol (deposit or repay) in the previous action
   * @param liquidityTaken The amount of liquidity taken from the protocol (withdraw or borrow)
   **/
  function updateInterestRates(
    DataTypes.ReserveData storage reserve,
    address reserveAddress,
    address bTokenAddress,
    uint256 liquidityAdded,
    uint256 liquidityTaken
  ) internal {
    UpdateInterestRatesLocalVars memory vars;
    //calculates the total variable debt locally using the scaled borrow amount instead
    //of borrow amount(), as it's noticeably cheaper. Also, the index has been
    //updated by the previous updateState() call
    vars.totalVariableDebt = IDebtToken(reserve.debtTokenAddress).scaledTotalSupply().rayMul(
      reserve.variableBorrowIndex
    );
    (vars.newLiquidityRate, vars.newVariableRate) = IInterestRate(reserve.interestRateAddress).calculateInterestRates(
      reserveAddress,
      bTokenAddress,
      liquidityAdded,
      liquidityTaken,
      vars.totalVariableDebt,
      reserve.configuration.getReserveFactor()
    );
    require(vars.newLiquidityRate <= type(uint128).max, Errors.RL_LIQUIDITY_RATE_OVERFLOW);
    require(vars.newVariableRate <= type(uint128).max, Errors.RL_VARIABLE_BORROW_RATE_OVERFLOW);
    reserve.currentLiquidityRate = uint128(vars.newLiquidityRate);
    reserve.currentVariableBorrowRate = uint128(vars.newVariableRate);
    emit ReserveDataUpdated(
      reserveAddress,
      vars.newLiquidityRate,
      vars.newVariableRate,
      reserve.liquidityIndex,
      reserve.variableBorrowIndex
    );
  }
  struct MintToTreasuryLocalVars {
    uint256 currentVariableDebt;
    uint256 previousVariableDebt;
    uint256 totalDebtAccrued;
    uint256 amountToMint;
    uint256 reserveFactor;
  }
  /**
   * @dev Mints part of the repaid interest to the reserve treasury as a function of the reserveFactor for the
   * specific asset.
   * @param reserve The reserve reserve to be updated
   * @param scaledVariableDebt The current scaled total variable debt
   * @param previousVariableBorrowIndex The variable borrow index before the last accumulation of the interest
   * @param newLiquidityIndex The new liquidity index
   * @param newVariableBorrowIndex The variable borrow index after the last accumulation of the interest
   **/
  function _mintToTreasury(
    DataTypes.ReserveData storage reserve,
    uint256 scaledVariableDebt,
    uint256 previousVariableBorrowIndex,
    uint256 newLiquidityIndex,
    uint256 newVariableBorrowIndex,
    uint40 timestamp
  ) internal {
    timestamp;
    MintToTreasuryLocalVars memory vars;
    vars.reserveFactor = reserve.configuration.getReserveFactor();
    if (vars.reserveFactor == 0) {
      return;
    }
    //calculate the last principal variable debt
    vars.previousVariableDebt = scaledVariableDebt.rayMul(previousVariableBorrowIndex);
    //calculate the new total supply after accumulation of the index
    vars.currentVariableDebt = scaledVariableDebt.rayMul(newVariableBorrowIndex);
    //debt accrued is the sum of the current debt minus the sum of the debt at the last update
    vars.totalDebtAccrued = vars.currentVariableDebt - (vars.previousVariableDebt);
    vars.amountToMint = vars.totalDebtAccrued.percentMul(vars.reserveFactor);
    if (vars.amountToMint != 0) {
      IBToken(reserve.bTokenAddress).mintToTreasury(vars.amountToMint, newLiquidityIndex);
    }
  }
  /**
   * @dev Updates the reserve indexes and the timestamp of the update
   * @param reserve The reserve reserve to be updated
   * @param scaledVariableDebt The scaled variable debt
   * @param liquidityIndex The last stored liquidity index
   * @param variableBorrowIndex The last stored variable borrow index
   **/
  function _updateIndexes(
    DataTypes.ReserveData storage reserve,
    uint256 scaledVariableDebt,
    uint256 liquidityIndex,
    uint256 variableBorrowIndex,
    uint40 timestamp
  ) internal returns (uint256, uint256) {
    uint256 currentLiquidityRate = reserve.currentLiquidityRate;
    uint256 newLiquidityIndex = liquidityIndex;
    uint256 newVariableBorrowIndex = variableBorrowIndex;
    //only cumulating if there is any income being produced
    if (currentLiquidityRate > 0) {
      uint256 cumulatedLiquidityInterest = MathUtils.calculateLinearInterest(currentLiquidityRate, timestamp);
      newLiquidityIndex = cumulatedLiquidityInterest.rayMul(liquidityIndex);
      require(newLiquidityIndex <= type(uint128).max, Errors.RL_LIQUIDITY_INDEX_OVERFLOW);
      reserve.liquidityIndex = uint128(newLiquidityIndex);
      //as the liquidity rate might come only from stable rate loans, we need to ensure
      //that there is actual variable debt before accumulating
      if (scaledVariableDebt != 0) {
        uint256 cumulatedVariableBorrowInterest = MathUtils.calculateCompoundedInterest(
          reserve.currentVariableBorrowRate,
          timestamp
        );
        newVariableBorrowIndex = cumulatedVariableBorrowInterest.rayMul(variableBorrowIndex);
        require(newVariableBorrowIndex <= type(uint128).max, Errors.RL_VARIABLE_BORROW_INDEX_OVERFLOW);
        reserve.variableBorrowIndex = uint128(newVariableBorrowIndex);
      }
    }
    //solium-disable-next-line
    reserve.lastUpdateTimestamp = uint40(block.timestamp);
    return (newLiquidityIndex, newVariableBorrowIndex);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
/**
 * @title NftLogic library
 * @author Bend
 * @notice Implements the logic to update the nft state
 */
library NftLogic {
  /**
   * @dev Initializes a nft
   * @param nft The nft object
   * @param bNftAddress The address of the bNFT contract
   **/
  function init(DataTypes.NftData storage nft, address bNftAddress) external {
    require(nft.bNftAddress == address(0), Errors.RL_RESERVE_ALREADY_INITIALIZED);
    nft.bNftAddress = bNftAddress;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ReserveLogic} from "./ReserveLogic.sol";
import {GenericLogic} from "./GenericLogic.sol";
import {WadRayMath} from "../math/WadRayMath.sol";
import {PercentageMath} from "../math/PercentageMath.sol";
import {ReserveConfiguration} from "../configuration/ReserveConfiguration.sol";
import {NftConfiguration} from "../configuration/NftConfiguration.sol";
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
import {IInterestRate} from "../../interfaces/IInterestRate.sol";
import {ILendPoolLoan} from "../../interfaces/ILendPoolLoan.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
/**
 * @title ValidationLogic library
 * @author Bend
 * @notice Implements functions to validate the different actions of the protocol
 */
library ValidationLogic {
  using ReserveLogic for DataTypes.ReserveData;
  using WadRayMath for uint256;
  using PercentageMath for uint256;
  using SafeERC20Upgradeable for IERC20Upgradeable;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  using NftConfiguration for DataTypes.NftConfigurationMap;
  /**
   * @dev Validates a deposit action
   * @param reserve The reserve object on which the user is depositing
   * @param amount The amount to be deposited
   */
  function validateDeposit(DataTypes.ReserveData storage reserve, uint256 amount) external view {
    (bool isActive, bool isFrozen, , ) = reserve.configuration.getFlags();
    require(amount != 0, Errors.VL_INVALID_AMOUNT);
    require(isActive, Errors.VL_NO_ACTIVE_RESERVE);
    require(!isFrozen, Errors.VL_RESERVE_FROZEN);
  }
  /**
   * @dev Validates a withdraw action
   * @param reserveData The reserve state
   * @param amount The amount to be withdrawn
   * @param userBalance The balance of the user
   */
  function validateWithdraw(
    DataTypes.ReserveData storage reserveData,
    uint256 amount,
    uint256 userBalance
  ) external view {
    require(amount != 0, Errors.VL_INVALID_AMOUNT);
    require(amount <= userBalance, Errors.VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE);
    (bool isActive, , , ) = reserveData.configuration.getFlags();
    require(isActive, Errors.VL_NO_ACTIVE_RESERVE);
  }
  struct ValidateBorrowLocalVars {
    uint256 currentLtv;
    uint256 currentLiquidationThreshold;
    uint256 amountOfCollateralNeeded;
    uint256 userCollateralBalance;
    uint256 userBorrowBalance;
    uint256 availableLiquidity;
    uint256 healthFactor;
    bool isActive;
    bool isFrozen;
    bool borrowingEnabled;
    bool stableRateBorrowingEnabled;
    bool nftIsActive;
    bool nftIsFrozen;
    address loanReserveAsset;
    address loanBorrower;
  }
  /**
   * @dev Validates a borrow action
   * @param reserveAsset The address of the asset to borrow
   * @param amount The amount to be borrowed
   * @param reserveData The reserve state from which the user is borrowing
   * @param nftData The state of the user for the specific nft
   */
  function validateBorrow(
    address user,
    address reserveAsset,
    uint256 amount,
    DataTypes.ReserveData storage reserveData,
    address nftAsset,
    DataTypes.NftData storage nftData,
    address loanAddress,
    uint256 loanId,
    address reserveOracle,
    address nftOracle
  ) external view {
    ValidateBorrowLocalVars memory vars;
    require(reserveData.bTokenAddress != address(0), Errors.VL_INVALID_RESERVE_ADDRESS);
    require(nftData.bNftAddress != address(0), Errors.LPC_INVALIED_BNFT_ADDRESS);
    require(amount > 0, Errors.VL_INVALID_AMOUNT);
    if (loanId != 0) {
      DataTypes.LoanData memory loanData = ILendPoolLoan(loanAddress).getLoan(loanId);
      require(loanData.state == DataTypes.LoanState.Active, Errors.LPL_INVALID_LOAN_STATE);
      require(reserveAsset == loanData.reserveAsset, Errors.VL_SPECIFIED_RESERVE_NOT_BORROWED_BY_USER);
      require(user == loanData.borrower, Errors.VL_SPECIFIED_LOAN_NOT_BORROWED_BY_USER);
    }
    (vars.isActive, vars.isFrozen, vars.borrowingEnabled, vars.stableRateBorrowingEnabled) = reserveData
      .configuration
      .getFlags();
    require(vars.isActive, Errors.VL_NO_ACTIVE_RESERVE);
    require(!vars.isFrozen, Errors.VL_RESERVE_FROZEN);
    require(vars.borrowingEnabled, Errors.VL_BORROWING_NOT_ENABLED);
    (vars.nftIsActive, vars.nftIsFrozen) = nftData.configuration.getFlags();
    require(vars.nftIsActive, Errors.VL_NO_ACTIVE_NFT);
    require(!vars.nftIsFrozen, Errors.VL_NFT_FROZEN);
    (vars.currentLtv, vars.currentLiquidationThreshold, ) = nftData.configuration.getCollateralParams();
    (vars.userCollateralBalance, vars.userBorrowBalance, vars.healthFactor) = GenericLogic.calculateLoanData(
      reserveAsset,
      reserveData,
      nftAsset,
      nftData,
      loanAddress,
      loanId,
      reserveOracle,
      nftOracle
    );
    require(vars.userCollateralBalance > 0, Errors.VL_COLLATERAL_BALANCE_IS_0);
    require(
      vars.healthFactor > GenericLogic.HEALTH_FACTOR_LIQUIDATION_THRESHOLD,
      Errors.VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD
    );
    //add the current already borrowed amount to the amount requested to calculate the total collateral needed.
    //LTV is calculated in percentage
    vars.amountOfCollateralNeeded = (vars.userBorrowBalance + amount).percentDiv(vars.currentLtv);
    require(vars.amountOfCollateralNeeded <= vars.userCollateralBalance, Errors.VL_COLLATERAL_CANNOT_COVER_NEW_BORROW);
  }
  /**
   * @dev Validates a repay action
   * @param reserveData The reserve state from which the user is repaying
   * @param amountSent The amount sent for the repayment. Can be an actual value or uint(-1)
   * @param borrowAmount The borrow balance of the user
   */
  function validateRepay(
    DataTypes.ReserveData storage reserveData,
    DataTypes.NftData storage nftData,
    DataTypes.LoanData memory loanData,
    uint256 amountSent,
    uint256 borrowAmount
  ) external view {
    require(nftData.bNftAddress != address(0), Errors.LPC_INVALIED_BNFT_ADDRESS);
    require(reserveData.bTokenAddress != address(0), Errors.VL_INVALID_RESERVE_ADDRESS);
    require(reserveData.configuration.getActive(), Errors.VL_NO_ACTIVE_RESERVE);
    require(nftData.configuration.getActive(), Errors.VL_NO_ACTIVE_NFT);
    require(amountSent > 0, Errors.VL_INVALID_AMOUNT);
    require(borrowAmount > 0, Errors.VL_NO_DEBT_OF_SELECTED_TYPE);
    require(loanData.state == DataTypes.LoanState.Active, Errors.LPL_INVALID_LOAN_STATE);
  }
  /**
   * @dev Validates the auction action
   * @param reserveData The reserve data of the principal
   * @param nftData The nft data of the underlying nft
   * @param bidPrice Total variable debt balance of the user
   **/
  function validateAuction(
    DataTypes.ReserveData storage reserveData,
    DataTypes.NftData storage nftData,
    DataTypes.LoanData memory loanData,
    uint256 bidPrice
  ) internal view {
    require(nftData.bNftAddress != address(0), Errors.LPC_INVALIED_BNFT_ADDRESS);
    require(reserveData.bTokenAddress != address(0), Errors.VL_INVALID_RESERVE_ADDRESS);
    require(reserveData.configuration.getActive(), Errors.VL_NO_ACTIVE_RESERVE);
    require(nftData.configuration.getActive(), Errors.VL_NO_ACTIVE_NFT);
    require(
      loanData.state == DataTypes.LoanState.Active || loanData.state == DataTypes.LoanState.Auction,
      Errors.LPL_INVALID_LOAN_STATE
    );
    require(bidPrice > 0, Errors.VL_INVALID_AMOUNT);
  }
  /**
   * @dev Validates a redeem action
   * @param reserveData The reserve state
   * @param nftData The nft state
   */
  function validateRedeem(
    DataTypes.ReserveData storage reserveData,
    DataTypes.NftData storage nftData,
    DataTypes.LoanData memory loanData,
    uint256 amount
  ) external view {
    require(nftData.bNftAddress != address(0), Errors.LPC_INVALIED_BNFT_ADDRESS);
    require(reserveData.bTokenAddress != address(0), Errors.VL_INVALID_RESERVE_ADDRESS);
    require(reserveData.configuration.getActive(), Errors.VL_NO_ACTIVE_RESERVE);
    require(nftData.configuration.getActive(), Errors.VL_NO_ACTIVE_NFT);
    require(loanData.state == DataTypes.LoanState.Auction, Errors.LPL_INVALID_LOAN_STATE);
    require(loanData.bidderAddress != address(0), Errors.LPL_INVALID_BIDDER_ADDRESS);
    require(amount > 0, Errors.VL_INVALID_AMOUNT);
  }
  /**
   * @dev Validates the liquidation action
   * @param reserveData The reserve data of the principal
   * @param nftData The data of the underlying NFT
   * @param loanData The loan data of the underlying NFT
   **/
  function validateLiquidate(
    DataTypes.ReserveData storage reserveData,
    DataTypes.NftData storage nftData,
    DataTypes.LoanData memory loanData
  ) internal view {
    require(nftData.bNftAddress != address(0), Errors.LPC_INVALIED_BNFT_ADDRESS);
    require(reserveData.bTokenAddress != address(0), Errors.VL_INVALID_RESERVE_ADDRESS);
    require(reserveData.configuration.getActive(), Errors.VL_NO_ACTIVE_RESERVE);
    require(nftData.configuration.getActive(), Errors.VL_NO_ACTIVE_NFT);
    require(loanData.state == DataTypes.LoanState.Auction, Errors.LPL_INVALID_LOAN_STATE);
    require(loanData.bidderAddress != address(0), Errors.LPL_INVALID_BIDDER_ADDRESS);
  }
  /**
   * @dev Validates an bToken transfer
   * @param from The user from which the bTokens are being transferred
   * @param reserveData The state of the reserve
   */
  function validateTransfer(address from, DataTypes.ReserveData storage reserveData) internal pure {
    from;
    reserveData;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IBToken} from "../../interfaces/IBToken.sol";
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
import {ReserveLogic} from "./ReserveLogic.sol";
import {ValidationLogic} from "./ValidationLogic.sol";
/**
 * @title SupplyLogic library
 * @author Bend
 * @notice Implements the logic to supply feature
 */
library SupplyLogic {
  using SafeERC20Upgradeable for IERC20Upgradeable;
  using ReserveLogic for DataTypes.ReserveData;
  /**
   * @dev Emitted on deposit()
   * @param user The address initiating the deposit
   * @param amount The amount deposited
   * @param reserve The address of the underlying asset of the reserve
   * @param onBehalfOf The beneficiary of the deposit, receiving the bTokens
   * @param referral The referral code used
   **/
  event Deposit(
    address user,
    address indexed reserve,
    uint256 amount,
    address indexed onBehalfOf,
    uint16 indexed referral
  );
  /**
   * @dev Emitted on withdraw()
   * @param user The address initiating the withdrawal, owner of bTokens
   * @param reserve The address of the underlyng asset being withdrawn
   * @param amount The amount to be withdrawn
   * @param to Address that will receive the underlying
   **/
  event Withdraw(address indexed user, address indexed reserve, uint256 amount, address indexed to);
  /**
   * @notice Implements the supply feature. Through `deposit()`, users deposit assets to the protocol.
   * @dev Emits the `Deposit()` event.
   * @param reservesData The state of all the reserves
   * @param params The additional parameters needed to execute the deposit function
   */
  function executeDeposit(
    mapping(address => DataTypes.ReserveData) storage reservesData,
    DataTypes.ExecuteDepositParams memory params
  ) external {
    require(params.onBehalfOf != address(0), Errors.VL_INVALID_ONBEHALFOF_ADDRESS);
    DataTypes.ReserveData storage reserve = reservesData[params.asset];
    address bToken = reserve.bTokenAddress;
    require(bToken != address(0), Errors.VL_INVALID_RESERVE_ADDRESS);
    ValidationLogic.validateDeposit(reserve, params.amount);
    reserve.updateState();
    reserve.updateInterestRates(params.asset, bToken, params.amount, 0);
    IERC20Upgradeable(params.asset).safeTransferFrom(params.initiator, bToken, params.amount);
    IBToken(bToken).mint(params.onBehalfOf, params.amount, reserve.liquidityIndex);
    emit Deposit(params.initiator, params.asset, params.amount, params.onBehalfOf, params.referralCode);
  }
  /**
   * @notice Implements the supply feature. Through `withdraw()`, users withdraw assets from the protocol.
   * @dev Emits the `Withdraw()` event.
   * @param reservesData The state of all the reserves
   * @param params The additional parameters needed to execute the withdraw function
   */
  function executeWithdraw(
    mapping(address => DataTypes.ReserveData) storage reservesData,
    DataTypes.ExecuteWithdrawParams memory params
  ) external returns (uint256) {
    require(params.to != address(0), Errors.VL_INVALID_TARGET_ADDRESS);
    DataTypes.ReserveData storage reserve = reservesData[params.asset];
    address bToken = reserve.bTokenAddress;
    require(bToken != address(0), Errors.VL_INVALID_RESERVE_ADDRESS);
    uint256 userBalance = IBToken(bToken).balanceOf(params.initiator);
    uint256 amountToWithdraw = params.amount;
    if (params.amount == type(uint256).max) {
      amountToWithdraw = userBalance;
    }
    ValidationLogic.validateWithdraw(reserve, amountToWithdraw, userBalance);
    reserve.updateState();
    reserve.updateInterestRates(params.asset, bToken, 0, amountToWithdraw);
    IBToken(bToken).burn(params.initiator, params.to, amountToWithdraw, reserve.liquidityIndex);
    emit Withdraw(params.initiator, params.asset, amountToWithdraw, params.to);
    return amountToWithdraw;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IBToken} from "../../interfaces/IBToken.sol";
import {IDebtToken} from "../../interfaces/IDebtToken.sol";
import {IInterestRate} from "../../interfaces/IInterestRate.sol";
import {ILendPoolAddressesProvider} from "../../interfaces/ILendPoolAddressesProvider.sol";
import {IReserveOracleGetter} from "../../interfaces/IReserveOracleGetter.sol";
import {INFTOracleGetter} from "../../interfaces/INFTOracleGetter.sol";
import {ILendPoolLoan} from "../../interfaces/ILendPoolLoan.sol";
import {ReserveConfiguration} from "../configuration/ReserveConfiguration.sol";
import {MathUtils} from "../math/MathUtils.sol";
import {WadRayMath} from "../math/WadRayMath.sol";
import {PercentageMath} from "../math/PercentageMath.sol";
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
import {IERC721Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC721/extensions/IERC721EnumerableUpgradeable.sol";
import {ReserveLogic} from "./ReserveLogic.sol";
import {GenericLogic} from "./GenericLogic.sol";
import {ValidationLogic} from "./ValidationLogic.sol";
/**
 * @title BorrowLogic library
 * @author Bend
 * @notice Implements the logic to borrow feature
 */
library BorrowLogic {
  using WadRayMath for uint256;
  using PercentageMath for uint256;
  using SafeERC20Upgradeable for IERC20Upgradeable;
  using ReserveLogic for DataTypes.ReserveData;
  /**
   * @dev Emitted on borrow() when loan needs to be opened
   * @param user The address of the user initiating the borrow(), receiving the funds
   * @param reserve The address of the underlying asset being borrowed
   * @param amount The amount borrowed out
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param onBehalfOf The address that will be getting the loan
   * @param referral The referral code used
   **/
  event Borrow(
    address user,
    address indexed reserve,
    uint256 amount,
    address nftAsset,
    uint256 nftTokenId,
    address indexed onBehalfOf,
    uint256 borrowRate,
    uint256 loanId,
    uint16 indexed referral
  );
  /**
   * @dev Emitted on repay()
   * @param user The address of the user initiating the repay(), providing the funds
   * @param reserve The address of the underlying asset of the reserve
   * @param amount The amount repaid
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param borrower The beneficiary of the repayment, getting his debt reduced
   * @param loanId The loan ID of the NFT loans
   **/
  event Repay(
    address user,
    address indexed reserve,
    uint256 amount,
    address indexed nftAsset,
    uint256 nftTokenId,
    address indexed borrower,
    uint256 loanId
  );
  struct ExecuteBorrowLocalVars {
    address initiator;
    uint256 ltv;
    uint256 liquidationThreshold;
    uint256 liquidationBonus;
    uint256 loanId;
    address reserveOracle;
    address nftOracle;
    address loanAddress;
    uint256 totalSupply;
  }
  /**
   * @notice Implements the borrow feature. Through `borrow()`, users borrow assets from the protocol.
   * @dev Emits the `Borrow()` event.
   * @param reservesData The state of all the reserves
   * @param nftsData The state of all the nfts
   * @param params The additional parameters needed to execute the borrow function
   */
  function executeBorrow(
    ILendPoolAddressesProvider addressesProvider,
    mapping(address => DataTypes.ReserveData) storage reservesData,
    mapping(address => DataTypes.NftData) storage nftsData,
    DataTypes.ExecuteBorrowParams memory params
  ) external {
    _borrow(addressesProvider, reservesData, nftsData, params);
  }
  /**
   * @notice Implements the batch borrow feature. Through `batchBorrow()`, users repay borrow to the protocol.
   * @dev Emits the `Borrow()` event.
   * @param reservesData The state of all the reserves
   * @param nftsData The state of all the nfts
   * @param params The additional parameters needed to execute the batchBorrow function
   */
  function executeBatchBorrow(
    ILendPoolAddressesProvider addressesProvider,
    mapping(address => DataTypes.ReserveData) storage reservesData,
    mapping(address => DataTypes.NftData) storage nftsData,
    DataTypes.ExecuteBatchBorrowParams memory params
  ) external {
    require(params.nftAssets.length == params.assets.length, "inconsistent assets length");
    require(params.nftAssets.length == params.amounts.length, "inconsistent amounts length");
    require(params.nftAssets.length == params.nftTokenIds.length, "inconsistent tokenIds length");
    for (uint256 i = 0; i < params.nftAssets.length; i++) {
      _borrow(
        addressesProvider,
        reservesData,
        nftsData,
        DataTypes.ExecuteBorrowParams({
          initiator: params.initiator,
          asset: params.assets[i],
          amount: params.amounts[i],
          nftAsset: params.nftAssets[i],
          nftTokenId: params.nftTokenIds[i],
          onBehalfOf: params.onBehalfOf,
          referralCode: params.referralCode
        })
      );
    }
  }
  function _borrow(
    ILendPoolAddressesProvider addressesProvider,
    mapping(address => DataTypes.ReserveData) storage reservesData,
    mapping(address => DataTypes.NftData) storage nftsData,
    DataTypes.ExecuteBorrowParams memory params
  ) internal {
    require(params.onBehalfOf != address(0), Errors.VL_INVALID_ONBEHALFOF_ADDRESS);
    ExecuteBorrowLocalVars memory vars;
    vars.initiator = params.initiator;
    DataTypes.ReserveData storage reserveData = reservesData[params.asset];
    DataTypes.NftData storage nftData = nftsData[params.nftAsset];
    // update state MUST BEFORE get borrow amount which is depent on latest borrow index
    reserveData.updateState();
    // Convert asset amount to ETH
    vars.reserveOracle = addressesProvider.getReserveOracle();
    vars.nftOracle = addressesProvider.getNFTOracle();
    vars.loanAddress = addressesProvider.getLendPoolLoan();
    vars.loanId = ILendPoolLoan(vars.loanAddress).getCollateralLoanId(params.nftAsset, params.nftTokenId);
    vars.totalSupply = IERC721EnumerableUpgradeable(params.nftAsset).totalSupply();
    require(vars.totalSupply <= nftData.maxSupply, Errors.LP_NFT_SUPPLY_NUM_EXCEED_MAX_LIMIT);
    require(params.nftTokenId <= nftData.maxTokenId, Errors.LP_NFT_TOKEN_ID_EXCEED_MAX_LIMIT);
    ValidationLogic.validateBorrow(
      params.onBehalfOf,
      params.asset,
      params.amount,
      reserveData,
      params.nftAsset,
      nftData,
      vars.loanAddress,
      vars.loanId,
      vars.reserveOracle,
      vars.nftOracle
    );
    if (vars.loanId == 0) {
      IERC721Upgradeable(params.nftAsset).safeTransferFrom(vars.initiator, address(this), params.nftTokenId);
      vars.loanId = ILendPoolLoan(vars.loanAddress).createLoan(
        vars.initiator,
        params.onBehalfOf,
        params.nftAsset,
        params.nftTokenId,
        nftData.bNftAddress,
        params.asset,
        params.amount,
        reserveData.variableBorrowIndex
      );
    } else {
      ILendPoolLoan(vars.loanAddress).updateLoan(
        vars.initiator,
        vars.loanId,
        params.amount,
        0,
        reserveData.variableBorrowIndex
      );
    }
    IDebtToken(reserveData.debtTokenAddress).mint(
      vars.initiator,
      params.onBehalfOf,
      params.amount,
      reserveData.variableBorrowIndex
    );
    // update interest rate according latest borrow amount (utilizaton)
    reserveData.updateInterestRates(params.asset, reserveData.bTokenAddress, 0, params.amount);
    IBToken(reserveData.bTokenAddress).transferUnderlyingTo(vars.initiator, params.amount);
    emit Borrow(
      vars.initiator,
      params.asset,
      params.amount,
      params.nftAsset,
      params.nftTokenId,
      params.onBehalfOf,
      reserveData.currentVariableBorrowRate,
      vars.loanId,
      params.referralCode
    );
  }
  struct RepayLocalVars {
    address initiator;
    address poolLoan;
    address onBehalfOf;
    uint256 loanId;
    bool isUpdate;
    uint256 borrowAmount;
    uint256 repayAmount;
  }
  /**
   * @notice Implements the borrow feature. Through `repay()`, users repay assets to the protocol.
   * @dev Emits the `Repay()` event.
   * @param reservesData The state of all the reserves
   * @param nftsData The state of all the nfts
   * @param params The additional parameters needed to execute the repay function
   */
  function executeRepay(
    ILendPoolAddressesProvider addressesProvider,
    mapping(address => DataTypes.ReserveData) storage reservesData,
    mapping(address => DataTypes.NftData) storage nftsData,
    DataTypes.ExecuteRepayParams memory params
  ) external returns (uint256, bool) {
    return _repay(addressesProvider, reservesData, nftsData, params);
  }
  /**
   * @notice Implements the batch repay feature. Through `batchRepay()`, users repay assets to the protocol.
   * @dev Emits the `repay()` event.
   * @param reservesData The state of all the reserves
   * @param nftsData The state of all the nfts
   * @param params The additional parameters needed to execute the batchRepay function
   */
  function executeBatchRepay(
    ILendPoolAddressesProvider addressesProvider,
    mapping(address => DataTypes.ReserveData) storage reservesData,
    mapping(address => DataTypes.NftData) storage nftsData,
    DataTypes.ExecuteBatchRepayParams memory params
  ) external returns (uint256[] memory, bool[] memory) {
    require(params.nftAssets.length == params.amounts.length, "inconsistent amounts length");
    require(params.nftAssets.length == params.nftTokenIds.length, "inconsistent tokenIds length");
    uint256[] memory repayAmounts = new uint256[](params.nftAssets.length);
    bool[] memory repayAlls = new bool[](params.nftAssets.length);
    for (uint256 i = 0; i < params.nftAssets.length; i++) {
      (repayAmounts[i], repayAlls[i]) = _repay(
        addressesProvider,
        reservesData,
        nftsData,
        DataTypes.ExecuteRepayParams({
          initiator: params.initiator,
          nftAsset: params.nftAssets[i],
          nftTokenId: params.nftTokenIds[i],
          amount: params.amounts[i]
        })
      );
    }
    return (repayAmounts, repayAlls);
  }
  function _repay(
    ILendPoolAddressesProvider addressesProvider,
    mapping(address => DataTypes.ReserveData) storage reservesData,
    mapping(address => DataTypes.NftData) storage nftsData,
    DataTypes.ExecuteRepayParams memory params
  ) internal returns (uint256, bool) {
    RepayLocalVars memory vars;
    vars.initiator = params.initiator;
    vars.poolLoan = addressesProvider.getLendPoolLoan();
    vars.loanId = ILendPoolLoan(vars.poolLoan).getCollateralLoanId(params.nftAsset, params.nftTokenId);
    require(vars.loanId != 0, Errors.LP_NFT_IS_NOT_USED_AS_COLLATERAL);
    DataTypes.LoanData memory loanData = ILendPoolLoan(vars.poolLoan).getLoan(vars.loanId);
    DataTypes.ReserveData storage reserveData = reservesData[loanData.reserveAsset];
    DataTypes.NftData storage nftData = nftsData[loanData.nftAsset];
    // update state MUST BEFORE get borrow amount which is depent on latest borrow index
    reserveData.updateState();
    (, vars.borrowAmount) = ILendPoolLoan(vars.poolLoan).getLoanReserveBorrowAmount(vars.loanId);
    ValidationLogic.validateRepay(reserveData, nftData, loanData, params.amount, vars.borrowAmount);
    vars.repayAmount = vars.borrowAmount;
    vars.isUpdate = false;
    if (params.amount < vars.repayAmount) {
      vars.isUpdate = true;
      vars.repayAmount = params.amount;
    }
    if (vars.isUpdate) {
      ILendPoolLoan(vars.poolLoan).updateLoan(
        vars.initiator,
        vars.loanId,
        0,
        vars.repayAmount,
        reserveData.variableBorrowIndex
      );
    } else {
      ILendPoolLoan(vars.poolLoan).repayLoan(
        vars.initiator,
        vars.loanId,
        nftData.bNftAddress,
        vars.repayAmount,
        reserveData.variableBorrowIndex
      );
    }
    IDebtToken(reserveData.debtTokenAddress).burn(loanData.borrower, vars.repayAmount, reserveData.variableBorrowIndex);
    // update interest rate according latest borrow amount (utilizaton)
    reserveData.updateInterestRates(loanData.reserveAsset, reserveData.bTokenAddress, vars.repayAmount, 0);
    // transfer repay amount to bToken
    IERC20Upgradeable(loanData.reserveAsset).safeTransferFrom(
      vars.initiator,
      reserveData.bTokenAddress,
      vars.repayAmount
    );
    // transfer erc721 to borrower
    if (!vars.isUpdate) {
      IERC721Upgradeable(loanData.nftAsset).safeTransferFrom(address(this), loanData.borrower, params.nftTokenId);
    }
    emit Repay(
      vars.initiator,
      loanData.reserveAsset,
      vars.repayAmount,
      loanData.nftAsset,
      loanData.nftTokenId,
      loanData.borrower,
      vars.loanId
    );
    return (vars.repayAmount, !vars.isUpdate);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IBToken} from "../../interfaces/IBToken.sol";
import {IDebtToken} from "../../interfaces/IDebtToken.sol";
import {IInterestRate} from "../../interfaces/IInterestRate.sol";
import {ILendPoolAddressesProvider} from "../../interfaces/ILendPoolAddressesProvider.sol";
import {IReserveOracleGetter} from "../../interfaces/IReserveOracleGetter.sol";
import {INFTOracleGetter} from "../../interfaces/INFTOracleGetter.sol";
import {ILendPoolLoan} from "../../interfaces/ILendPoolLoan.sol";
import {ReserveLogic} from "./ReserveLogic.sol";
import {GenericLogic} from "./GenericLogic.sol";
import {ValidationLogic} from "./ValidationLogic.sol";
import {ReserveConfiguration} from "../configuration/ReserveConfiguration.sol";
import {NftConfiguration} from "../configuration/NftConfiguration.sol";
import {MathUtils} from "../math/MathUtils.sol";
import {WadRayMath} from "../math/WadRayMath.sol";
import {PercentageMath} from "../math/PercentageMath.sol";
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
import {IERC721Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
/**
 * @title LiquidateLogic library
 * @author Bend
 * @notice Implements the logic to liquidate feature
 */
library LiquidateLogic {
  using WadRayMath for uint256;
  using PercentageMath for uint256;
  using SafeERC20Upgradeable for IERC20Upgradeable;
  using ReserveLogic for DataTypes.ReserveData;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  using NftConfiguration for DataTypes.NftConfigurationMap;
  /**
   * @dev Emitted when a borrower's loan is auctioned.
   * @param user The address of the user initiating the auction
   * @param reserve The address of the underlying asset of the reserve
   * @param bidPrice The price of the underlying reserve given by the bidder
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param onBehalfOf The address that will be getting the NFT
   * @param loanId The loan ID of the NFT loans
   **/
  event Auction(
    address user,
    address indexed reserve,
    uint256 bidPrice,
    address indexed nftAsset,
    uint256 nftTokenId,
    address onBehalfOf,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted on redeem()
   * @param user The address of the user initiating the redeem(), providing the funds
   * @param reserve The address of the underlying asset of the reserve
   * @param borrowAmount The borrow amount repaid
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param loanId The loan ID of the NFT loans
   **/
  event Redeem(
    address user,
    address indexed reserve,
    uint256 borrowAmount,
    uint256 fineAmount,
    address indexed nftAsset,
    uint256 nftTokenId,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted when a borrower's loan is liquidated.
   * @param user The address of the user initiating the auction
   * @param reserve The address of the underlying asset of the reserve
   * @param repayAmount The amount of reserve repaid by the liquidator
   * @param remainAmount The amount of reserve received by the borrower
   * @param loanId The loan ID of the NFT loans
   **/
  event Liquidate(
    address user,
    address indexed reserve,
    uint256 repayAmount,
    uint256 remainAmount,
    address indexed nftAsset,
    uint256 nftTokenId,
    address indexed borrower,
    uint256 loanId
  );
  struct AuctionLocalVars {
    address loanAddress;
    address reserveOracle;
    address nftOracle;
    address initiator;
    uint256 loanId;
    uint256 thresholdPrice;
    uint256 liquidatePrice;
    uint256 borrowAmount;
    uint256 auctionEndTimestamp;
    uint256 minBidDelta;
    uint256 extraAuctionDuration;
  }
  /**
   * @notice Implements the auction feature. Through `auction()`, users auction assets in the protocol.
   * @dev Emits the `Auction()` event.
   * @param reservesData The state of all the reserves
   * @param nftsData The state of all the nfts
   * @param poolStates The state of the lend pool
   * @param params The additional parameters needed to execute the auction function
   */
  function executeAuction(
    ILendPoolAddressesProvider addressesProvider,
    mapping(address => DataTypes.ReserveData) storage reservesData,
    mapping(address => DataTypes.NftData) storage nftsData,
    DataTypes.ExecuteLendPoolStates memory poolStates,
    DataTypes.ExecuteAuctionParams memory params
  ) external {
    require(params.onBehalfOf != address(0), Errors.VL_INVALID_ONBEHALFOF_ADDRESS);
    AuctionLocalVars memory vars;
    vars.initiator = params.initiator;
    vars.loanAddress = addressesProvider.getLendPoolLoan();
    vars.reserveOracle = addressesProvider.getReserveOracle();
    vars.nftOracle = addressesProvider.getNFTOracle();
    vars.loanId = ILendPoolLoan(vars.loanAddress).getCollateralLoanId(params.nftAsset, params.nftTokenId);
    require(vars.loanId != 0, Errors.LP_NFT_IS_NOT_USED_AS_COLLATERAL);
    DataTypes.LoanData memory loanData = ILendPoolLoan(vars.loanAddress).getLoan(vars.loanId);
    DataTypes.ReserveData storage reserveData = reservesData[loanData.reserveAsset];
    DataTypes.NftData storage nftData = nftsData[loanData.nftAsset];
    ValidationLogic.validateAuction(reserveData, nftData, loanData, params.bidPrice);
    // update state MUST BEFORE get borrow amount which is depent on latest borrow index
    reserveData.updateState();
    (vars.borrowAmount, vars.thresholdPrice, vars.liquidatePrice) = GenericLogic.calculateLoanLiquidatePrice(
      vars.loanId,
      loanData.reserveAsset,
      reserveData,
      loanData.nftAsset,
      nftData,
      vars.loanAddress,
      vars.reserveOracle,
      vars.nftOracle
    );
    // first time bid need to burn debt tokens and transfer reserve to bTokens
    if (loanData.state == DataTypes.LoanState.Active) {
      // loan's accumulated debt must exceed threshold (heath factor below 1.0)
      require(vars.borrowAmount > vars.thresholdPrice, Errors.LP_BORROW_NOT_EXCEED_LIQUIDATION_THRESHOLD);
      // bid price must greater than liquidate price
      require(params.bidPrice >= vars.liquidatePrice, Errors.LPL_BID_PRICE_LESS_THAN_LIQUIDATION_PRICE);
      // bid price must greater than borrow debt
      require(params.bidPrice >= vars.borrowAmount, Errors.LPL_BID_PRICE_LESS_THAN_BORROW);
    } else {
      // bid price must greater than borrow debt
      require(params.bidPrice >= vars.borrowAmount, Errors.LPL_BID_PRICE_LESS_THAN_BORROW);
      if ((poolStates.pauseDurationTime > 0) && (loanData.bidStartTimestamp <= poolStates.pauseStartTime)) {
        vars.extraAuctionDuration = poolStates.pauseDurationTime;
      }
      vars.auctionEndTimestamp =
        loanData.bidStartTimestamp +
        vars.extraAuctionDuration +
        (nftData.configuration.getAuctionDuration() * 1 hours);
      require(block.timestamp <= vars.auctionEndTimestamp, Errors.LPL_BID_AUCTION_DURATION_HAS_END);
      // bid price must greater than highest bid + delta
      vars.minBidDelta = vars.borrowAmount.percentMul(PercentageMath.ONE_PERCENT);
      require(params.bidPrice >= (loanData.bidPrice + vars.minBidDelta), Errors.LPL_BID_PRICE_LESS_THAN_HIGHEST_PRICE);
    }
    ILendPoolLoan(vars.loanAddress).auctionLoan(
      vars.initiator,
      vars.loanId,
      params.onBehalfOf,
      params.bidPrice,
      vars.borrowAmount,
      reserveData.variableBorrowIndex
    );
    // lock highest bidder bid price amount to lend pool
    IERC20Upgradeable(loanData.reserveAsset).safeTransferFrom(vars.initiator, address(this), params.bidPrice);
    // transfer (return back) last bid price amount to previous bidder from lend pool
    if (loanData.bidderAddress != address(0)) {
      IERC20Upgradeable(loanData.reserveAsset).safeTransfer(loanData.bidderAddress, loanData.bidPrice);
    }
    // update interest rate according latest borrow amount (utilizaton)
    reserveData.updateInterestRates(loanData.reserveAsset, reserveData.bTokenAddress, 0, 0);
    emit Auction(
      vars.initiator,
      loanData.reserveAsset,
      params.bidPrice,
      params.nftAsset,
      params.nftTokenId,
      params.onBehalfOf,
      loanData.borrower,
      vars.loanId
    );
  }
  struct RedeemLocalVars {
    address initiator;
    address poolLoan;
    address reserveOracle;
    address nftOracle;
    uint256 loanId;
    uint256 borrowAmount;
    uint256 repayAmount;
    uint256 minRepayAmount;
    uint256 maxRepayAmount;
    uint256 bidFine;
    uint256 redeemEndTimestamp;
    uint256 minBidFinePct;
    uint256 minBidFine;
    uint256 extraRedeemDuration;
  }
  /**
   * @notice Implements the redeem feature. Through `redeem()`, users redeem assets in the protocol.
   * @dev Emits the `Redeem()` event.
   * @param reservesData The state of all the reserves
   * @param nftsData The state of all the nfts
   * @param poolStates The state of the lend pool
   * @param params The additional parameters needed to execute the redeem function
   */
  function executeRedeem(
    ILendPoolAddressesProvider addressesProvider,
    mapping(address => DataTypes.ReserveData) storage reservesData,
    mapping(address => DataTypes.NftData) storage nftsData,
    DataTypes.ExecuteLendPoolStates memory poolStates,
    DataTypes.ExecuteRedeemParams memory params
  ) external returns (uint256) {
    RedeemLocalVars memory vars;
    vars.initiator = params.initiator;
    vars.poolLoan = addressesProvider.getLendPoolLoan();
    vars.reserveOracle = addressesProvider.getReserveOracle();
    vars.nftOracle = addressesProvider.getNFTOracle();
    vars.loanId = ILendPoolLoan(vars.poolLoan).getCollateralLoanId(params.nftAsset, params.nftTokenId);
    require(vars.loanId != 0, Errors.LP_NFT_IS_NOT_USED_AS_COLLATERAL);
    DataTypes.LoanData memory loanData = ILendPoolLoan(vars.poolLoan).getLoan(vars.loanId);
    DataTypes.ReserveData storage reserveData = reservesData[loanData.reserveAsset];
    DataTypes.NftData storage nftData = nftsData[loanData.nftAsset];
    ValidationLogic.validateRedeem(reserveData, nftData, loanData, params.amount);
    if ((poolStates.pauseDurationTime > 0) && (loanData.bidStartTimestamp <= poolStates.pauseStartTime)) {
      vars.extraRedeemDuration = poolStates.pauseDurationTime;
    }
    vars.redeemEndTimestamp = (loanData.bidStartTimestamp +
      vars.extraRedeemDuration +
      nftData.configuration.getRedeemDuration() *
      1 hours);
    require(block.timestamp <= vars.redeemEndTimestamp, Errors.LPL_BID_REDEEM_DURATION_HAS_END);
    // update state MUST BEFORE get borrow amount which is depent on latest borrow index
    reserveData.updateState();
    (vars.borrowAmount, , ) = GenericLogic.calculateLoanLiquidatePrice(
      vars.loanId,
      loanData.reserveAsset,
      reserveData,
      loanData.nftAsset,
      nftData,
      vars.poolLoan,
      vars.reserveOracle,
      vars.nftOracle
    );
    // check bid fine in min & max range
    (, vars.bidFine) = GenericLogic.calculateLoanBidFine(
      loanData.reserveAsset,
      reserveData,
      loanData.nftAsset,
      nftData,
      loanData,
      vars.poolLoan,
      vars.reserveOracle
    );
    // check bid fine is enough
    require(vars.bidFine <= params.bidFine, Errors.LPL_INVALID_BID_FINE);
    // check the minimum debt repay amount, use redeem threshold in config
    vars.repayAmount = params.amount;
    vars.minRepayAmount = vars.borrowAmount.percentMul(nftData.configuration.getRedeemThreshold());
    require(vars.repayAmount >= vars.minRepayAmount, Errors.LP_AMOUNT_LESS_THAN_REDEEM_THRESHOLD);
    // check the maxinmum debt repay amount, 90%?
    vars.maxRepayAmount = vars.borrowAmount.percentMul(PercentageMath.PERCENTAGE_FACTOR - PercentageMath.TEN_PERCENT);
    require(vars.repayAmount <= vars.maxRepayAmount, Errors.LP_AMOUNT_GREATER_THAN_MAX_REPAY);
    ILendPoolLoan(vars.poolLoan).redeemLoan(
      vars.initiator,
      vars.loanId,
      vars.repayAmount,
      reserveData.variableBorrowIndex
    );
    IDebtToken(reserveData.debtTokenAddress).burn(loanData.borrower, vars.repayAmount, reserveData.variableBorrowIndex);
    // update interest rate according latest borrow amount (utilizaton)
    reserveData.updateInterestRates(loanData.reserveAsset, reserveData.bTokenAddress, vars.repayAmount, 0);
    // transfer repay amount from borrower to bToken
    IERC20Upgradeable(loanData.reserveAsset).safeTransferFrom(
      vars.initiator,
      reserveData.bTokenAddress,
      vars.repayAmount
    );
    if (loanData.bidderAddress != address(0)) {
      // transfer (return back) last bid price amount from lend pool to bidder
      IERC20Upgradeable(loanData.reserveAsset).safeTransfer(loanData.bidderAddress, loanData.bidPrice);
      // transfer bid penalty fine amount from borrower to the first bidder
      IERC20Upgradeable(loanData.reserveAsset).safeTransferFrom(
        vars.initiator,
        loanData.firstBidderAddress,
        vars.bidFine
      );
    }
    emit Redeem(
      vars.initiator,
      loanData.reserveAsset,
      vars.repayAmount,
      vars.bidFine,
      loanData.nftAsset,
      loanData.nftTokenId,
      loanData.borrower,
      vars.loanId
    );
    return (vars.repayAmount + vars.bidFine);
  }
  struct LiquidateLocalVars {
    address initiator;
    address poolLoan;
    address reserveOracle;
    address nftOracle;
    uint256 loanId;
    uint256 borrowAmount;
    uint256 extraDebtAmount;
    uint256 remainAmount;
    uint256 auctionEndTimestamp;
    uint256 extraAuctionDuration;
  }
  /**
   * @notice Implements the liquidate feature. Through `liquidate()`, users liquidate assets in the protocol.
   * @dev Emits the `Liquidate()` event.
   * @param reservesData The state of all the reserves
   * @param nftsData The state of all the nfts
   * @param poolStates The state of the lend pool
   * @param params The additional parameters needed to execute the liquidate function
   */
  function executeLiquidate(
    ILendPoolAddressesProvider addressesProvider,
    mapping(address => DataTypes.ReserveData) storage reservesData,
    mapping(address => DataTypes.NftData) storage nftsData,
    DataTypes.ExecuteLendPoolStates memory poolStates,
    DataTypes.ExecuteLiquidateParams memory params
  ) external returns (uint256) {
    LiquidateLocalVars memory vars;
    vars.initiator = params.initiator;
    vars.poolLoan = addressesProvider.getLendPoolLoan();
    vars.reserveOracle = addressesProvider.getReserveOracle();
    vars.nftOracle = addressesProvider.getNFTOracle();
    vars.loanId = ILendPoolLoan(vars.poolLoan).getCollateralLoanId(params.nftAsset, params.nftTokenId);
    require(vars.loanId != 0, Errors.LP_NFT_IS_NOT_USED_AS_COLLATERAL);
    DataTypes.LoanData memory loanData = ILendPoolLoan(vars.poolLoan).getLoan(vars.loanId);
    DataTypes.ReserveData storage reserveData = reservesData[loanData.reserveAsset];
    DataTypes.NftData storage nftData = nftsData[loanData.nftAsset];
    ValidationLogic.validateLiquidate(reserveData, nftData, loanData);
    if ((poolStates.pauseDurationTime > 0) && (loanData.bidStartTimestamp <= poolStates.pauseStartTime)) {
      vars.extraAuctionDuration = poolStates.pauseDurationTime;
    }
    vars.auctionEndTimestamp =
      loanData.bidStartTimestamp +
      vars.extraAuctionDuration +
      (nftData.configuration.getAuctionDuration() * 1 hours);
    require(block.timestamp > vars.auctionEndTimestamp, Errors.LPL_BID_AUCTION_DURATION_NOT_END);
    // update state MUST BEFORE get borrow amount which is depent on latest borrow index
    reserveData.updateState();
    (vars.borrowAmount, , ) = GenericLogic.calculateLoanLiquidatePrice(
      vars.loanId,
      loanData.reserveAsset,
      reserveData,
      loanData.nftAsset,
      nftData,
      vars.poolLoan,
      vars.reserveOracle,
      vars.nftOracle
    );
    // Last bid price can not cover borrow amount
    if (loanData.bidPrice < vars.borrowAmount) {
      vars.extraDebtAmount = vars.borrowAmount - loanData.bidPrice;
      require(params.amount >= vars.extraDebtAmount, Errors.LP_AMOUNT_LESS_THAN_EXTRA_DEBT);
    }
    if (loanData.bidPrice > vars.borrowAmount) {
      vars.remainAmount = loanData.bidPrice - vars.borrowAmount;
    }
    ILendPoolLoan(vars.poolLoan).liquidateLoan(
      loanData.bidderAddress,
      vars.loanId,
      nftData.bNftAddress,
      vars.borrowAmount,
      reserveData.variableBorrowIndex
    );
    IDebtToken(reserveData.debtTokenAddress).burn(
      loanData.borrower,
      vars.borrowAmount,
      reserveData.variableBorrowIndex
    );
    // update interest rate according latest borrow amount (utilizaton)
    reserveData.updateInterestRates(loanData.reserveAsset, reserveData.bTokenAddress, vars.borrowAmount, 0);
    // transfer extra borrow amount from liquidator to lend pool
    if (vars.extraDebtAmount > 0) {
      IERC20Upgradeable(loanData.reserveAsset).safeTransferFrom(vars.initiator, address(this), vars.extraDebtAmount);
    }
    // transfer borrow amount from lend pool to bToken, repay debt
    IERC20Upgradeable(loanData.reserveAsset).safeTransfer(reserveData.bTokenAddress, vars.borrowAmount);
    // transfer remain amount to borrower
    if (vars.remainAmount > 0) {
      IERC20Upgradeable(loanData.reserveAsset).safeTransfer(loanData.borrower, vars.remainAmount);
    }
    // transfer erc721 to bidder
    IERC721Upgradeable(loanData.nftAsset).safeTransferFrom(address(this), loanData.bidderAddress, params.nftTokenId);
    emit Liquidate(
      vars.initiator,
      loanData.reserveAsset,
      vars.borrowAmount,
      vars.remainAmount,
      loanData.nftAsset,
      loanData.nftTokenId,
      loanData.borrower,
      vars.loanId
    );
    return (vars.extraDebtAmount);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
/**
 * @title ReserveConfiguration library
 * @author Bend
 * @notice Implements the bitmap logic to handle the reserve configuration
 */
library ReserveConfiguration {
  uint256 constant LTV_MASK =                   0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000; // prettier-ignore
  uint256 constant LIQUIDATION_THRESHOLD_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFF; // prettier-ignore
  uint256 constant LIQUIDATION_BONUS_MASK =     0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFF; // prettier-ignore
  uint256 constant DECIMALS_MASK =              0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00FFFFFFFFFFFF; // prettier-ignore
  uint256 constant ACTIVE_MASK =                0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant FROZEN_MASK =                0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFDFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant BORROWING_MASK =             0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFBFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant STABLE_BORROWING_MASK =      0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7FFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant RESERVE_FACTOR_MASK =        0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFFFFFFFFFF; // prettier-ignore
  /// @dev For the LTV, the start bit is 0 (up to 15), hence no bitshifting is needed
  uint256 constant LIQUIDATION_THRESHOLD_START_BIT_POSITION = 16;
  uint256 constant LIQUIDATION_BONUS_START_BIT_POSITION = 32;
  uint256 constant RESERVE_DECIMALS_START_BIT_POSITION = 48;
  uint256 constant IS_ACTIVE_START_BIT_POSITION = 56;
  uint256 constant IS_FROZEN_START_BIT_POSITION = 57;
  uint256 constant BORROWING_ENABLED_START_BIT_POSITION = 58;
  uint256 constant STABLE_BORROWING_ENABLED_START_BIT_POSITION = 59;
  uint256 constant RESERVE_FACTOR_START_BIT_POSITION = 64;
  uint256 constant MAX_VALID_LTV = 65535;
  uint256 constant MAX_VALID_LIQUIDATION_THRESHOLD = 65535;
  uint256 constant MAX_VALID_LIQUIDATION_BONUS = 65535;
  uint256 constant MAX_VALID_DECIMALS = 255;
  uint256 constant MAX_VALID_RESERVE_FACTOR = 65535;
  /**
   * @dev Sets the Loan to Value of the reserve
   * @param self The reserve configuration
   * @param ltv the new ltv
   **/
  function setLtv(DataTypes.ReserveConfigurationMap memory self, uint256 ltv) internal pure {
    require(ltv <= MAX_VALID_LTV, Errors.RC_INVALID_LTV);
    self.data = (self.data & LTV_MASK) | ltv;
  }
  /**
   * @dev Gets the Loan to Value of the reserve
   * @param self The reserve configuration
   * @return The loan to value
   **/
  function getLtv(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) {
    return self.data & ~LTV_MASK;
  }
  /**
   * @dev Sets the liquidation threshold of the reserve
   * @param self The reserve configuration
   * @param threshold The new liquidation threshold
   **/
  function setLiquidationThreshold(DataTypes.ReserveConfigurationMap memory self, uint256 threshold) internal pure {
    require(threshold <= MAX_VALID_LIQUIDATION_THRESHOLD, Errors.RC_INVALID_LIQ_THRESHOLD);
    self.data = (self.data & LIQUIDATION_THRESHOLD_MASK) | (threshold << LIQUIDATION_THRESHOLD_START_BIT_POSITION);
  }
  /**
   * @dev Gets the liquidation threshold of the reserve
   * @param self The reserve configuration
   * @return The liquidation threshold
   **/
  function getLiquidationThreshold(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION;
  }
  /**
   * @dev Sets the liquidation bonus of the reserve
   * @param self The reserve configuration
   * @param bonus The new liquidation bonus
   **/
  function setLiquidationBonus(DataTypes.ReserveConfigurationMap memory self, uint256 bonus) internal pure {
    require(bonus <= MAX_VALID_LIQUIDATION_BONUS, Errors.RC_INVALID_LIQ_BONUS);
    self.data = (self.data & LIQUIDATION_BONUS_MASK) | (bonus << LIQUIDATION_BONUS_START_BIT_POSITION);
  }
  /**
   * @dev Gets the liquidation bonus of the reserve
   * @param self The reserve configuration
   * @return The liquidation bonus
   **/
  function getLiquidationBonus(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION;
  }
  /**
   * @dev Sets the decimals of the underlying asset of the reserve
   * @param self The reserve configuration
   * @param decimals The decimals
   **/
  function setDecimals(DataTypes.ReserveConfigurationMap memory self, uint256 decimals) internal pure {
    require(decimals <= MAX_VALID_DECIMALS, Errors.RC_INVALID_DECIMALS);
    self.data = (self.data & DECIMALS_MASK) | (decimals << RESERVE_DECIMALS_START_BIT_POSITION);
  }
  /**
   * @dev Gets the decimals of the underlying asset of the reserve
   * @param self The reserve configuration
   * @return The decimals of the asset
   **/
  function getDecimals(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION;
  }
  /**
   * @dev Sets the active state of the reserve
   * @param self The reserve configuration
   * @param active The active state
   **/
  function setActive(DataTypes.ReserveConfigurationMap memory self, bool active) internal pure {
    self.data = (self.data & ACTIVE_MASK) | (uint256(active ? 1 : 0) << IS_ACTIVE_START_BIT_POSITION);
  }
  /**
   * @dev Gets the active state of the reserve
   * @param self The reserve configuration
   * @return The active state
   **/
  function getActive(DataTypes.ReserveConfigurationMap storage self) internal view returns (bool) {
    return (self.data & ~ACTIVE_MASK) != 0;
  }
  /**
   * @dev Sets the frozen state of the reserve
   * @param self The reserve configuration
   * @param frozen The frozen state
   **/
  function setFrozen(DataTypes.ReserveConfigurationMap memory self, bool frozen) internal pure {
    self.data = (self.data & FROZEN_MASK) | (uint256(frozen ? 1 : 0) << IS_FROZEN_START_BIT_POSITION);
  }
  /**
   * @dev Gets the frozen state of the reserve
   * @param self The reserve configuration
   * @return The frozen state
   **/
  function getFrozen(DataTypes.ReserveConfigurationMap storage self) internal view returns (bool) {
    return (self.data & ~FROZEN_MASK) != 0;
  }
  /**
   * @dev Enables or disables borrowing on the reserve
   * @param self The reserve configuration
   * @param enabled True if the borrowing needs to be enabled, false otherwise
   **/
  function setBorrowingEnabled(DataTypes.ReserveConfigurationMap memory self, bool enabled) internal pure {
    self.data = (self.data & BORROWING_MASK) | (uint256(enabled ? 1 : 0) << BORROWING_ENABLED_START_BIT_POSITION);
  }
  /**
   * @dev Gets the borrowing state of the reserve
   * @param self The reserve configuration
   * @return The borrowing state
   **/
  function getBorrowingEnabled(DataTypes.ReserveConfigurationMap storage self) internal view returns (bool) {
    return (self.data & ~BORROWING_MASK) != 0;
  }
  /**
   * @dev Enables or disables stable rate borrowing on the reserve
   * @param self The reserve configuration
   * @param enabled True if the stable rate borrowing needs to be enabled, false otherwise
   **/
  function setStableRateBorrowingEnabled(DataTypes.ReserveConfigurationMap memory self, bool enabled) internal pure {
    self.data =
      (self.data & STABLE_BORROWING_MASK) |
      (uint256(enabled ? 1 : 0) << STABLE_BORROWING_ENABLED_START_BIT_POSITION);
  }
  /**
   * @dev Gets the stable rate borrowing state of the reserve
   * @param self The reserve configuration
   * @return The stable rate borrowing state
   **/
  function getStableRateBorrowingEnabled(DataTypes.ReserveConfigurationMap storage self) internal view returns (bool) {
    return (self.data & ~STABLE_BORROWING_MASK) != 0;
  }
  /**
   * @dev Sets the reserve factor of the reserve
   * @param self The reserve configuration
   * @param reserveFactor The reserve factor
   **/
  function setReserveFactor(DataTypes.ReserveConfigurationMap memory self, uint256 reserveFactor) internal pure {
    require(reserveFactor <= MAX_VALID_RESERVE_FACTOR, Errors.RC_INVALID_RESERVE_FACTOR);
    self.data = (self.data & RESERVE_FACTOR_MASK) | (reserveFactor << RESERVE_FACTOR_START_BIT_POSITION);
  }
  /**
   * @dev Gets the reserve factor of the reserve
   * @param self The reserve configuration
   * @return The reserve factor
   **/
  function getReserveFactor(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~RESERVE_FACTOR_MASK) >> RESERVE_FACTOR_START_BIT_POSITION;
  }
  /**
   * @dev Gets the configuration flags of the reserve
   * @param self The reserve configuration
   * @return The state flags representing active, frozen, borrowing enabled, stableRateBorrowing enabled
   **/
  function getFlags(DataTypes.ReserveConfigurationMap storage self)
    internal
    view
    returns (
      bool,
      bool,
      bool,
      bool
    )
  {
    uint256 dataLocal = self.data;
    return (
      (dataLocal & ~ACTIVE_MASK) != 0,
      (dataLocal & ~FROZEN_MASK) != 0,
      (dataLocal & ~BORROWING_MASK) != 0,
      (dataLocal & ~STABLE_BORROWING_MASK) != 0
    );
  }
  /**
   * @dev Gets the configuration paramters of the reserve
   * @param self The reserve configuration
   * @return The state params representing ltv, liquidation threshold, liquidation bonus, the reserve decimals
   **/
  function getParams(DataTypes.ReserveConfigurationMap storage self)
    internal
    view
    returns (
      uint256,
      uint256,
      uint256,
      uint256,
      uint256
    )
  {
    uint256 dataLocal = self.data;
    return (
      dataLocal & ~LTV_MASK,
      (dataLocal & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION,
      (dataLocal & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION,
      (dataLocal & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION,
      (dataLocal & ~RESERVE_FACTOR_MASK) >> RESERVE_FACTOR_START_BIT_POSITION
    );
  }
  /**
   * @dev Gets the configuration paramters of the reserve from a memory object
   * @param self The reserve configuration
   * @return The state params representing ltv, liquidation threshold, liquidation bonus, the reserve decimals
   **/
  function getParamsMemory(DataTypes.ReserveConfigurationMap memory self)
    internal
    pure
    returns (
      uint256,
      uint256,
      uint256,
      uint256,
      uint256
    )
  {
    return (
      self.data & ~LTV_MASK,
      (self.data & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION,
      (self.data & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION,
      (self.data & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION,
      (self.data & ~RESERVE_FACTOR_MASK) >> RESERVE_FACTOR_START_BIT_POSITION
    );
  }
  /**
   * @dev Gets the configuration flags of the reserve from a memory object
   * @param self The reserve configuration
   * @return The state flags representing active, frozen, borrowing enabled, stableRateBorrowing enabled
   **/
  function getFlagsMemory(DataTypes.ReserveConfigurationMap memory self)
    internal
    pure
    returns (
      bool,
      bool,
      bool,
      bool
    )
  {
    return (
      (self.data & ~ACTIVE_MASK) != 0,
      (self.data & ~FROZEN_MASK) != 0,
      (self.data & ~BORROWING_MASK) != 0,
      (self.data & ~STABLE_BORROWING_MASK) != 0
    );
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
/**
 * @title NftConfiguration library
 * @author Bend
 * @notice Implements the bitmap logic to handle the NFT configuration
 */
library NftConfiguration {
  uint256 constant LTV_MASK =                   0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000; // prettier-ignore
  uint256 constant LIQUIDATION_THRESHOLD_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFF; // prettier-ignore
  uint256 constant LIQUIDATION_BONUS_MASK =     0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFF; // prettier-ignore
  uint256 constant ACTIVE_MASK =                0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant FROZEN_MASK =                0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFDFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant REDEEM_DURATION_MASK =       0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00FFFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant AUCTION_DURATION_MASK =      0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00FFFFFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant REDEEM_FINE_MASK =           0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant REDEEM_THRESHOLD_MASK =      0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFFFFFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant MIN_BIDFINE_MASK      =      0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFFFFFFFFFFFFFFFFFFFFFF; // prettier-ignore
  /// @dev For the LTV, the start bit is 0 (up to 15), hence no bitshifting is needed
  uint256 constant LIQUIDATION_THRESHOLD_START_BIT_POSITION = 16;
  uint256 constant LIQUIDATION_BONUS_START_BIT_POSITION = 32;
  uint256 constant IS_ACTIVE_START_BIT_POSITION = 56;
  uint256 constant IS_FROZEN_START_BIT_POSITION = 57;
  uint256 constant REDEEM_DURATION_START_BIT_POSITION = 64;
  uint256 constant AUCTION_DURATION_START_BIT_POSITION = 72;
  uint256 constant REDEEM_FINE_START_BIT_POSITION = 80;
  uint256 constant REDEEM_THRESHOLD_START_BIT_POSITION = 96;
  uint256 constant MIN_BIDFINE_START_BIT_POSITION = 112;
  uint256 constant MAX_VALID_LTV = 65535;
  uint256 constant MAX_VALID_LIQUIDATION_THRESHOLD = 65535;
  uint256 constant MAX_VALID_LIQUIDATION_BONUS = 65535;
  uint256 constant MAX_VALID_REDEEM_DURATION = 255;
  uint256 constant MAX_VALID_AUCTION_DURATION = 255;
  uint256 constant MAX_VALID_REDEEM_FINE = 65535;
  uint256 constant MAX_VALID_REDEEM_THRESHOLD = 65535;
  uint256 constant MAX_VALID_MIN_BIDFINE = 65535;
  /**
   * @dev Sets the Loan to Value of the NFT
   * @param self The NFT configuration
   * @param ltv the new ltv
   **/
  function setLtv(DataTypes.NftConfigurationMap memory self, uint256 ltv) internal pure {
    require(ltv <= MAX_VALID_LTV, Errors.RC_INVALID_LTV);
    self.data = (self.data & LTV_MASK) | ltv;
  }
  /**
   * @dev Gets the Loan to Value of the NFT
   * @param self The NFT configuration
   * @return The loan to value
   **/
  function getLtv(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return self.data & ~LTV_MASK;
  }
  /**
   * @dev Sets the liquidation threshold of the NFT
   * @param self The NFT configuration
   * @param threshold The new liquidation threshold
   **/
  function setLiquidationThreshold(DataTypes.NftConfigurationMap memory self, uint256 threshold) internal pure {
    require(threshold <= MAX_VALID_LIQUIDATION_THRESHOLD, Errors.RC_INVALID_LIQ_THRESHOLD);
    self.data = (self.data & LIQUIDATION_THRESHOLD_MASK) | (threshold << LIQUIDATION_THRESHOLD_START_BIT_POSITION);
  }
  /**
   * @dev Gets the liquidation threshold of the NFT
   * @param self The NFT configuration
   * @return The liquidation threshold
   **/
  function getLiquidationThreshold(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION;
  }
  /**
   * @dev Sets the liquidation bonus of the NFT
   * @param self The NFT configuration
   * @param bonus The new liquidation bonus
   **/
  function setLiquidationBonus(DataTypes.NftConfigurationMap memory self, uint256 bonus) internal pure {
    require(bonus <= MAX_VALID_LIQUIDATION_BONUS, Errors.RC_INVALID_LIQ_BONUS);
    self.data = (self.data & LIQUIDATION_BONUS_MASK) | (bonus << LIQUIDATION_BONUS_START_BIT_POSITION);
  }
  /**
   * @dev Gets the liquidation bonus of the NFT
   * @param self The NFT configuration
   * @return The liquidation bonus
   **/
  function getLiquidationBonus(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION;
  }
  /**
   * @dev Sets the active state of the NFT
   * @param self The NFT configuration
   * @param active The active state
   **/
  function setActive(DataTypes.NftConfigurationMap memory self, bool active) internal pure {
    self.data = (self.data & ACTIVE_MASK) | (uint256(active ? 1 : 0) << IS_ACTIVE_START_BIT_POSITION);
  }
  /**
   * @dev Gets the active state of the NFT
   * @param self The NFT configuration
   * @return The active state
   **/
  function getActive(DataTypes.NftConfigurationMap storage self) internal view returns (bool) {
    return (self.data & ~ACTIVE_MASK) != 0;
  }
  /**
   * @dev Sets the frozen state of the NFT
   * @param self The NFT configuration
   * @param frozen The frozen state
   **/
  function setFrozen(DataTypes.NftConfigurationMap memory self, bool frozen) internal pure {
    self.data = (self.data & FROZEN_MASK) | (uint256(frozen ? 1 : 0) << IS_FROZEN_START_BIT_POSITION);
  }
  /**
   * @dev Gets the frozen state of the NFT
   * @param self The NFT configuration
   * @return The frozen state
   **/
  function getFrozen(DataTypes.NftConfigurationMap storage self) internal view returns (bool) {
    return (self.data & ~FROZEN_MASK) != 0;
  }
  /**
   * @dev Sets the redeem duration of the NFT
   * @param self The NFT configuration
   * @param redeemDuration The redeem duration
   **/
  function setRedeemDuration(DataTypes.NftConfigurationMap memory self, uint256 redeemDuration) internal pure {
    require(redeemDuration <= MAX_VALID_REDEEM_DURATION, Errors.RC_INVALID_REDEEM_DURATION);
    self.data = (self.data & REDEEM_DURATION_MASK) | (redeemDuration << REDEEM_DURATION_START_BIT_POSITION);
  }
  /**
   * @dev Gets the redeem duration of the NFT
   * @param self The NFT configuration
   * @return The redeem duration
   **/
  function getRedeemDuration(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~REDEEM_DURATION_MASK) >> REDEEM_DURATION_START_BIT_POSITION;
  }
  /**
   * @dev Sets the auction duration of the NFT
   * @param self The NFT configuration
   * @param auctionDuration The auction duration
   **/
  function setAuctionDuration(DataTypes.NftConfigurationMap memory self, uint256 auctionDuration) internal pure {
    require(auctionDuration <= MAX_VALID_AUCTION_DURATION, Errors.RC_INVALID_AUCTION_DURATION);
    self.data = (self.data & AUCTION_DURATION_MASK) | (auctionDuration << AUCTION_DURATION_START_BIT_POSITION);
  }
  /**
   * @dev Gets the auction duration of the NFT
   * @param self The NFT configuration
   * @return The auction duration
   **/
  function getAuctionDuration(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~AUCTION_DURATION_MASK) >> AUCTION_DURATION_START_BIT_POSITION;
  }
  /**
   * @dev Sets the redeem fine of the NFT
   * @param self The NFT configuration
   * @param redeemFine The redeem duration
   **/
  function setRedeemFine(DataTypes.NftConfigurationMap memory self, uint256 redeemFine) internal pure {
    require(redeemFine <= MAX_VALID_REDEEM_FINE, Errors.RC_INVALID_REDEEM_FINE);
    self.data = (self.data & REDEEM_FINE_MASK) | (redeemFine << REDEEM_FINE_START_BIT_POSITION);
  }
  /**
   * @dev Gets the redeem fine of the NFT
   * @param self The NFT configuration
   * @return The redeem fine
   **/
  function getRedeemFine(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~REDEEM_FINE_MASK) >> REDEEM_FINE_START_BIT_POSITION;
  }
  /**
   * @dev Sets the redeem threshold of the NFT
   * @param self The NFT configuration
   * @param redeemThreshold The redeem duration
   **/
  function setRedeemThreshold(DataTypes.NftConfigurationMap memory self, uint256 redeemThreshold) internal pure {
    require(redeemThreshold <= MAX_VALID_REDEEM_THRESHOLD, Errors.RC_INVALID_REDEEM_THRESHOLD);
    self.data = (self.data & REDEEM_THRESHOLD_MASK) | (redeemThreshold << REDEEM_THRESHOLD_START_BIT_POSITION);
  }
  /**
   * @dev Gets the redeem threshold of the NFT
   * @param self The NFT configuration
   * @return The redeem threshold
   **/
  function getRedeemThreshold(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~REDEEM_THRESHOLD_MASK) >> REDEEM_THRESHOLD_START_BIT_POSITION;
  }
  /**
   * @dev Sets the min & max threshold of the NFT
   * @param self The NFT configuration
   * @param minBidFine The min bid fine
   **/
  function setMinBidFine(DataTypes.NftConfigurationMap memory self, uint256 minBidFine) internal pure {
    require(minBidFine <= MAX_VALID_MIN_BIDFINE, Errors.RC_INVALID_MIN_BID_FINE);
    self.data = (self.data & MIN_BIDFINE_MASK) | (minBidFine << MIN_BIDFINE_START_BIT_POSITION);
  }
  /**
   * @dev Gets the min bid fine of the NFT
   * @param self The NFT configuration
   * @return The min bid fine
   **/
  function getMinBidFine(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return ((self.data & ~MIN_BIDFINE_MASK) >> MIN_BIDFINE_START_BIT_POSITION);
  }
  /**
   * @dev Gets the configuration flags of the NFT
   * @param self The NFT configuration
   * @return The state flags representing active, frozen
   **/
  function getFlags(DataTypes.NftConfigurationMap storage self) internal view returns (bool, bool) {
    uint256 dataLocal = self.data;
    return ((dataLocal & ~ACTIVE_MASK) != 0, (dataLocal & ~FROZEN_MASK) != 0);
  }
  /**
   * @dev Gets the configuration flags of the NFT from a memory object
   * @param self The NFT configuration
   * @return The state flags representing active, frozen
   **/
  function getFlagsMemory(DataTypes.NftConfigurationMap memory self) internal pure returns (bool, bool) {
    return ((self.data & ~ACTIVE_MASK) != 0, (self.data & ~FROZEN_MASK) != 0);
  }
  /**
   * @dev Gets the collateral configuration paramters of the NFT
   * @param self The NFT configuration
   * @return The state params representing ltv, liquidation threshold, liquidation bonus
   **/
  function getCollateralParams(DataTypes.NftConfigurationMap storage self)
    internal
    view
    returns (
      uint256,
      uint256,
      uint256
    )
  {
    uint256 dataLocal = self.data;
    return (
      dataLocal & ~LTV_MASK,
      (dataLocal & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION,
      (dataLocal & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION
    );
  }
  /**
   * @dev Gets the auction configuration paramters of the NFT
   * @param self The NFT configuration
   * @return The state params representing redeem duration, auction duration, redeem fine
   **/
  function getAuctionParams(DataTypes.NftConfigurationMap storage self)
    internal
    view
    returns (
      uint256,
      uint256,
      uint256,
      uint256
    )
  {
    uint256 dataLocal = self.data;
    return (
      (dataLocal & ~REDEEM_DURATION_MASK) >> REDEEM_DURATION_START_BIT_POSITION,
      (dataLocal & ~AUCTION_DURATION_MASK) >> AUCTION_DURATION_START_BIT_POSITION,
      (dataLocal & ~REDEEM_FINE_MASK) >> REDEEM_FINE_START_BIT_POSITION,
      (dataLocal & ~REDEEM_THRESHOLD_MASK) >> REDEEM_THRESHOLD_START_BIT_POSITION
    );
  }
  /**
   * @dev Gets the collateral configuration paramters of the NFT from a memory object
   * @param self The NFT configuration
   * @return The state params representing ltv, liquidation threshold, liquidation bonus
   **/
  function getCollateralParamsMemory(DataTypes.NftConfigurationMap memory self)
    internal
    pure
    returns (
      uint256,
      uint256,
      uint256
    )
  {
    return (
      self.data & ~LTV_MASK,
      (self.data & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION,
      (self.data & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION
    );
  }
  /**
   * @dev Gets the auction configuration paramters of the NFT from a memory object
   * @param self The NFT configuration
   * @return The state params representing redeem duration, auction duration, redeem fine
   **/
  function getAuctionParamsMemory(DataTypes.NftConfigurationMap memory self)
    internal
    pure
    returns (
      uint256,
      uint256,
      uint256,
      uint256
    )
  {
    return (
      (self.data & ~REDEEM_DURATION_MASK) >> REDEEM_DURATION_START_BIT_POSITION,
      (self.data & ~AUCTION_DURATION_MASK) >> AUCTION_DURATION_START_BIT_POSITION,
      (self.data & ~REDEEM_FINE_MASK) >> REDEEM_FINE_START_BIT_POSITION,
      (self.data & ~REDEEM_THRESHOLD_MASK) >> REDEEM_THRESHOLD_START_BIT_POSITION
    );
  }
  /**
   * @dev Gets the min & max bid fine of the NFT
   * @param self The NFT configuration
   * @return The min & max bid fine
   **/
  function getMinBidFineMemory(DataTypes.NftConfigurationMap memory self) internal pure returns (uint256) {
    return ((self.data & ~MIN_BIDFINE_MASK) >> MIN_BIDFINE_START_BIT_POSITION);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
library DataTypes {
  struct ReserveData {
    //stores the reserve configuration
    ReserveConfigurationMap configuration;
    //the liquidity index. Expressed in ray
    uint128 liquidityIndex;
    //variable borrow index. Expressed in ray
    uint128 variableBorrowIndex;
    //the current supply rate. Expressed in ray
    uint128 currentLiquidityRate;
    //the current variable borrow rate. Expressed in ray
    uint128 currentVariableBorrowRate;
    uint40 lastUpdateTimestamp;
    //tokens addresses
    address bTokenAddress;
    address debtTokenAddress;
    //address of the interest rate strategy
    address interestRateAddress;
    //the id of the reserve. Represents the position in the list of the active reserves
    uint8 id;
  }
  struct NftData {
    //stores the nft configuration
    NftConfigurationMap configuration;
    //address of the bNFT contract
    address bNftAddress;
    //the id of the nft. Represents the position in the list of the active nfts
    uint8 id;
    uint256 maxSupply;
    uint256 maxTokenId;
  }
  struct ReserveConfigurationMap {
    //bit 0-15: LTV
    //bit 16-31: Liq. threshold
    //bit 32-47: Liq. bonus
    //bit 48-55: Decimals
    //bit 56: Reserve is active
    //bit 57: reserve is frozen
    //bit 58: borrowing is enabled
    //bit 59: stable rate borrowing enabled
    //bit 60-63: reserved
    //bit 64-79: reserve factor
    uint256 data;
  }
  struct NftConfigurationMap {
    //bit 0-15: LTV
    //bit 16-31: Liq. threshold
    //bit 32-47: Liq. bonus
    //bit 56: NFT is active
    //bit 57: NFT is frozen
    uint256 data;
  }
  /**
   * @dev Enum describing the current state of a loan
   * State change flow:
   *  Created -> Active -> Repaid
   *                    -> Auction -> Defaulted
   */
  enum LoanState {
    // We need a default that is not 'Created' - this is the zero value
    None,
    // The loan data is stored, but not initiated yet.
    Created,
    // The loan has been initialized, funds have been delivered to the borrower and the collateral is held.
    Active,
    // The loan is in auction, higest price liquidator will got chance to claim it.
    Auction,
    // The loan has been repaid, and the collateral has been returned to the borrower. This is a terminal state.
    Repaid,
    // The loan was delinquent and collateral claimed by the liquidator. This is a terminal state.
    Defaulted
  }
  struct LoanData {
    //the id of the nft loan
    uint256 loanId;
    //the current state of the loan
    LoanState state;
    //address of borrower
    address borrower;
    //address of nft asset token
    address nftAsset;
    //the id of nft token
    uint256 nftTokenId;
    //address of reserve asset token
    address reserveAsset;
    //scaled borrow amount. Expressed in ray
    uint256 scaledAmount;
    //start time of first bid time
    uint256 bidStartTimestamp;
    //bidder address of higest bid
    address bidderAddress;
    //price of higest bid
    uint256 bidPrice;
    //borrow amount of loan
    uint256 bidBorrowAmount;
    //bidder address of first bid
    address firstBidderAddress;
  }
  struct ExecuteDepositParams {
    address initiator;
    address asset;
    uint256 amount;
    address onBehalfOf;
    uint16 referralCode;
  }
  struct ExecuteWithdrawParams {
    address initiator;
    address asset;
    uint256 amount;
    address to;
  }
  struct ExecuteBorrowParams {
    address initiator;
    address asset;
    uint256 amount;
    address nftAsset;
    uint256 nftTokenId;
    address onBehalfOf;
    uint16 referralCode;
  }
  struct ExecuteBatchBorrowParams {
    address initiator;
    address[] assets;
    uint256[] amounts;
    address[] nftAssets;
    uint256[] nftTokenIds;
    address onBehalfOf;
    uint16 referralCode;
  }
  struct ExecuteRepayParams {
    address initiator;
    address nftAsset;
    uint256 nftTokenId;
    uint256 amount;
  }
  struct ExecuteBatchRepayParams {
    address initiator;
    address[] nftAssets;
    uint256[] nftTokenIds;
    uint256[] amounts;
  }
  struct ExecuteAuctionParams {
    address initiator;
    address nftAsset;
    uint256 nftTokenId;
    uint256 bidPrice;
    address onBehalfOf;
  }
  struct ExecuteRedeemParams {
    address initiator;
    address nftAsset;
    uint256 nftTokenId;
    uint256 amount;
    uint256 bidFine;
  }
  struct ExecuteLiquidateParams {
    address initiator;
    address nftAsset;
    uint256 nftTokenId;
    uint256 amount;
  }
  struct ExecuteLendPoolStates {
    uint256 pauseStartTime;
    uint256 pauseDurationTime;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {DataTypes} from "../libraries/types/DataTypes.sol";
import {ReserveLogic} from "../libraries/logic/ReserveLogic.sol";
import {NftLogic} from "../libraries/logic/NftLogic.sol";
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
contract LendPoolStorage {
  using ReserveLogic for DataTypes.ReserveData;
  using NftLogic for DataTypes.NftData;
  ILendPoolAddressesProvider internal _addressesProvider;
  mapping(address => DataTypes.ReserveData) internal _reserves;
  mapping(address => DataTypes.NftData) internal _nfts;
  mapping(uint256 => address) internal _reservesList;
  uint256 internal _reservesCount;
  mapping(uint256 => address) internal _nftsList;
  uint256 internal _nftsCount;
  bool internal _paused;
  uint256 internal _maxNumberOfReserves;
  uint256 internal _maxNumberOfNfts;
  // !!! Never add new variable at here, because this contract is inherited by LendPool !!!
  // !!! Add new variable at LendPool directly !!!
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
contract LendPoolStorageExt {
  // !!! Add new variable MUST append it only, do not insert, update type & name, or change order !!!
  // https://docs.openzeppelin.com/upgrades-plugins/1.x/writing-upgradeable#potentially-unsafe-operations
  uint256 internal constant _NOT_ENTERED = 0;
  uint256 internal constant _ENTERED = 1;
  uint256 internal _status;
  uint256 internal _pauseStartTime;
  uint256 internal _pauseDurationTime;
  // For upgradable, add one new variable above, minus 1 at here
  uint256[47] private __gap;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)
pragma solidity ^0.8.0;
/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);
    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.0;
import "../IERC20Upgradeable.sol";
import "../../../utils/AddressUpgradeable.sol";
/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20Upgradeable {
    using AddressUpgradeable for address;
    function safeTransfer(
        IERC20Upgradeable token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }
    function safeTransferFrom(
        IERC20Upgradeable token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }
    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }
    function safeIncreaseAllowance(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    function safeDecreaseAllowance(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }
    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20Upgradeable token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.
        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165Upgradeable.sol";
/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721Upgradeable is IERC165Upgradeable {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);
    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;
    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);
    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;
    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)
pragma solidity ^0.8.0;
/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721ReceiverUpgradeable {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/utils/Initializable.sol)
pragma solidity ^0.8.0;
import "../../utils/AddressUpgradeable.sol";
/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To initialize the implementation contract, you can either invoke the
 * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() initializer {}
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;
    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;
    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, because in other contexts the
        // contract may have been reentered.
        require(_initializing ? _isConstructor() : !_initialized, "Initializable: contract is already initialized");
        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
        }
    }
    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} modifier, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }
    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";
/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
        __Context_init_unchained();
    }
    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
    uint256[50] private __gap;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/************
@title IReserveOracleGetter interface
@notice Interface for getting Reserve price oracle.*/
interface IReserveOracleGetter {
  /* CAUTION: Price uint is ETH based (WEI, 18 decimals) */
  /***********
    @dev returns the asset price in ETH
     */
  function getAssetPrice(address asset) external view returns (uint256);
  // get twap price depending on _period
  function getTwapPrice(address _priceFeedKey, uint256 _interval) external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/************
@title INFTOracleGetter interface
@notice Interface for getting NFT price oracle.*/
interface INFTOracleGetter {
  /* CAUTION: Price uint is ETH based (WEI, 18 decimals) */
  /***********
    @dev returns the asset price in ETH
     */
  function getAssetPrice(address asset) external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ILendPoolAddressesProvider} from "./ILendPoolAddressesProvider.sol";
import {IIncentivesController} from "./IIncentivesController.sol";
import {IScaledBalanceToken} from "./IScaledBalanceToken.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {IERC20MetadataUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/IERC20MetadataUpgradeable.sol";
interface IBToken is IScaledBalanceToken, IERC20Upgradeable, IERC20MetadataUpgradeable {
  /**
   * @dev Emitted when an bToken is initialized
   * @param underlyingAsset The address of the underlying asset
   * @param pool The address of the associated lending pool
   * @param treasury The address of the treasury
   * @param incentivesController The address of the incentives controller for this bToken
   **/
  event Initialized(
    address indexed underlyingAsset,
    address indexed pool,
    address treasury,
    address incentivesController
  );
  /**
   * @dev Initializes the bToken
   * @param addressProvider The address of the address provider where this bToken will be used
   * @param treasury The address of the Bend treasury, receiving the fees on this bToken
   * @param underlyingAsset The address of the underlying asset of this bToken
   */
  function initialize(
    ILendPoolAddressesProvider addressProvider,
    address treasury,
    address underlyingAsset,
    uint8 bTokenDecimals,
    string calldata bTokenName,
    string calldata bTokenSymbol
  ) external;
  /**
   * @dev Emitted after the mint action
   * @param from The address performing the mint
   * @param value The amount being
   * @param index The new liquidity index of the reserve
   **/
  event Mint(address indexed from, uint256 value, uint256 index);
  /**
   * @dev Mints `amount` bTokens to `user`
   * @param user The address receiving the minted tokens
   * @param amount The amount of tokens getting minted
   * @param index The new liquidity index of the reserve
   * @return `true` if the the previous balance of the user was 0
   */
  function mint(
    address user,
    uint256 amount,
    uint256 index
  ) external returns (bool);
  /**
   * @dev Emitted after bTokens are burned
   * @param from The owner of the bTokens, getting them burned
   * @param target The address that will receive the underlying
   * @param value The amount being burned
   * @param index The new liquidity index of the reserve
   **/
  event Burn(address indexed from, address indexed target, uint256 value, uint256 index);
  /**
   * @dev Emitted during the transfer action
   * @param from The user whose tokens are being transferred
   * @param to The recipient
   * @param value The amount being transferred
   * @param index The new liquidity index of the reserve
   **/
  event BalanceTransfer(address indexed from, address indexed to, uint256 value, uint256 index);
  /**
   * @dev Burns bTokens from `user` and sends the equivalent amount of underlying to `receiverOfUnderlying`
   * @param user The owner of the bTokens, getting them burned
   * @param receiverOfUnderlying The address that will receive the underlying
   * @param amount The amount being burned
   * @param index The new liquidity index of the reserve
   **/
  function burn(
    address user,
    address receiverOfUnderlying,
    uint256 amount,
    uint256 index
  ) external;
  /**
   * @dev Mints bTokens to the reserve treasury
   * @param amount The amount of tokens getting minted
   * @param index The new liquidity index of the reserve
   */
  function mintToTreasury(uint256 amount, uint256 index) external;
  /**
   * @dev Transfers the underlying asset to `target`. Used by the LendPool to transfer
   * assets in borrow(), withdraw() and flashLoan()
   * @param user The recipient of the underlying
   * @param amount The amount getting transferred
   * @return The amount transferred
   **/
  function transferUnderlyingTo(address user, uint256 amount) external returns (uint256);
  /**
   * @dev Returns the address of the incentives controller contract
   **/
  function getIncentivesController() external view returns (IIncentivesController);
  /**
   * @dev Returns the address of the underlying asset of this bToken
   **/
  function UNDERLYING_ASSET_ADDRESS() external view returns (address);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
import {IIncentivesController} from "./IIncentivesController.sol";
import {IScaledBalanceToken} from "./IScaledBalanceToken.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {IERC20MetadataUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/IERC20MetadataUpgradeable.sol";
/**
 * @title IDebtToken
 * @author Bend
 * @notice Defines the basic interface for a debt token.
 **/
interface IDebtToken is IScaledBalanceToken, IERC20Upgradeable, IERC20MetadataUpgradeable {
  /**
   * @dev Emitted when a debt token is initialized
   * @param underlyingAsset The address of the underlying asset
   * @param pool The address of the associated lend pool
   * @param incentivesController The address of the incentives controller
   * @param debtTokenDecimals the decimals of the debt token
   * @param debtTokenName the name of the debt token
   * @param debtTokenSymbol the symbol of the debt token
   **/
  event Initialized(
    address indexed underlyingAsset,
    address indexed pool,
    address incentivesController,
    uint8 debtTokenDecimals,
    string debtTokenName,
    string debtTokenSymbol
  );
  /**
   * @dev Initializes the debt token.
   * @param addressProvider The address of the lend pool
   * @param underlyingAsset The address of the underlying asset
   * @param debtTokenDecimals The decimals of the debtToken, same as the underlying asset's
   * @param debtTokenName The name of the token
   * @param debtTokenSymbol The symbol of the token
   */
  function initialize(
    ILendPoolAddressesProvider addressProvider,
    address underlyingAsset,
    uint8 debtTokenDecimals,
    string memory debtTokenName,
    string memory debtTokenSymbol
  ) external;
  /**
   * @dev Emitted after the mint action
   * @param from The address performing the mint
   * @param value The amount to be minted
   * @param index The last index of the reserve
   **/
  event Mint(address indexed from, uint256 value, uint256 index);
  /**
   * @dev Mints debt token to the `user` address
   * @param user The address receiving the borrowed underlying
   * @param amount The amount of debt being minted
   * @param index The variable debt index of the reserve
   * @return `true` if the the previous balance of the user is 0
   **/
  function mint(
    address user,
    address onBehalfOf,
    uint256 amount,
    uint256 index
  ) external returns (bool);
  /**
   * @dev Emitted when variable debt is burnt
   * @param user The user which debt has been burned
   * @param amount The amount of debt being burned
   * @param index The index of the user
   **/
  event Burn(address indexed user, uint256 amount, uint256 index);
  /**
   * @dev Burns user variable debt
   * @param user The user which debt is burnt
   * @param index The variable debt index of the reserve
   **/
  function burn(
    address user,
    uint256 amount,
    uint256 index
  ) external;
  /**
   * @dev Returns the address of the incentives controller contract
   **/
  function getIncentivesController() external view returns (IIncentivesController);
  /**
   * @dev delegates borrowing power to a user on the specific debt token
   * @param delegatee the address receiving the delegated borrowing power
   * @param amount the maximum amount being delegated. Delegation will still
   * respect the liquidation constraints (even if delegated, a delegatee cannot
   * force a delegator HF to go below 1)
   **/
  function approveDelegation(address delegatee, uint256 amount) external;
  /**
   * @dev returns the borrow allowance of the user
   * @param fromUser The user to giving allowance
   * @param toUser The user to give allowance to
   * @return the current allowance of toUser
   **/
  function borrowAllowance(address fromUser, address toUser) external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title IInterestRate interface
 * @dev Interface for the calculation of the interest rates
 * @author Bend
 */
interface IInterestRate {
  function baseVariableBorrowRate() external view returns (uint256);
  function getMaxVariableBorrowRate() external view returns (uint256);
  function calculateInterestRates(
    address reserve,
    uint256 availableLiquidity,
    uint256 totalVariableDebt,
    uint256 reserveFactor
  ) external view returns (uint256, uint256);
  function calculateInterestRates(
    address reserve,
    address bToken,
    uint256 liquidityAdded,
    uint256 liquidityTaken,
    uint256 totalVariableDebt,
    uint256 reserveFactor
  ) external view returns (uint256 liquidityRate, uint256 variableBorrowRate);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {WadRayMath} from "./WadRayMath.sol";
library MathUtils {
  using WadRayMath for uint256;
  /// @dev Ignoring leap years
  uint256 internal constant SECONDS_PER_YEAR = 365 days;
  /**
   * @dev Function to calculate the interest accumulated using a linear interest rate formula
   * @param rate The interest rate, in ray
   * @param lastUpdateTimestamp The timestamp of the last update of the interest
   * @return The interest rate linearly accumulated during the timeDelta, in ray
   **/
  function calculateLinearInterest(uint256 rate, uint40 lastUpdateTimestamp) internal view returns (uint256) {
    //solium-disable-next-line
    uint256 timeDifference = block.timestamp - (uint256(lastUpdateTimestamp));
    return ((rate * (timeDifference)) / SECONDS_PER_YEAR) + (WadRayMath.ray());
  }
  /**
   * @dev Function to calculate the interest using a compounded interest rate formula
   * To avoid expensive exponentiation, the calculation is performed using a binomial approximation:
   *
   *  (1+x)^n = 1+n*x+[n/2*(n-1)]*x^2+[n/6*(n-1)*(n-2)*x^3...
   *
   * The approximation slightly underpays liquidity providers and undercharges borrowers, with the advantage of great gas cost reductions
   * The whitepaper contains reference to the approximation and a table showing the margin of error per different time periods
   *
   * @param rate The interest rate, in ray
   * @param lastUpdateTimestamp The timestamp of the last update of the interest
   * @return The interest rate compounded during the timeDelta, in ray
   **/
  function calculateCompoundedInterest(
    uint256 rate,
    uint40 lastUpdateTimestamp,
    uint256 currentTimestamp
  ) internal pure returns (uint256) {
    //solium-disable-next-line
    uint256 exp = currentTimestamp - (uint256(lastUpdateTimestamp));
    if (exp == 0) {
      return WadRayMath.ray();
    }
    uint256 expMinusOne = exp - 1;
    uint256 expMinusTwo = exp > 2 ? exp - 2 : 0;
    uint256 ratePerSecond = rate / SECONDS_PER_YEAR;
    uint256 basePowerTwo = ratePerSecond.rayMul(ratePerSecond);
    uint256 basePowerThree = basePowerTwo.rayMul(ratePerSecond);
    uint256 secondTerm = (exp * (expMinusOne) * (basePowerTwo)) / 2;
    uint256 thirdTerm = (exp * (expMinusOne) * (expMinusTwo) * (basePowerThree)) / 6;
    return WadRayMath.ray() + (ratePerSecond * (exp)) + (secondTerm) + (thirdTerm);
  }
  /**
   * @dev Calculates the compounded interest between the timestamp of the last update and the current block timestamp
   * @param rate The interest rate (in ray)
   * @param lastUpdateTimestamp The timestamp from which the interest accumulation needs to be calculated
   **/
  function calculateCompoundedInterest(uint256 rate, uint40 lastUpdateTimestamp) internal view returns (uint256) {
    return calculateCompoundedInterest(rate, lastUpdateTimestamp, block.timestamp);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
interface IIncentivesController {
  /**
   * @dev Called by the corresponding asset on any update that affects the rewards distribution
   * @param asset The address of the user
   * @param totalSupply The total supply of the asset in the lending pool
   * @param userBalance The balance of the user of the asset in the lending pool
   **/
  function handleAction(
    address asset,
    uint256 totalSupply,
    uint256 userBalance
  ) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
interface IScaledBalanceToken {
  /**
   * @dev Returns the scaled balance of the user. The scaled balance is the sum of all the
   * updated stored balance divided by the reserve's liquidity index at the moment of the update
   * @param user The user whose balance is calculated
   * @return The scaled balance of the user
   **/
  function scaledBalanceOf(address user) external view returns (uint256);
  /**
   * @dev Returns the scaled balance of the user and the scaled total supply.
   * @param user The address of the user
   * @return The scaled balance of the user
   * @return The scaled balance and the scaled total supply
   **/
  function getScaledUserBalanceAndSupply(address user) external view returns (uint256, uint256);
  /**
   * @dev Returns the scaled total supply of the variable debt token. Represents sum(debt/index)
   * @return The scaled total supply
   **/
  function scaledTotalSupply() external view returns (uint256);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)
pragma solidity ^0.8.0;
import "../IERC20Upgradeable.sol";
/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20MetadataUpgradeable is IERC20Upgradeable {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);
    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);
    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Enumerable.sol)
pragma solidity ^0.8.0;
import "../IERC721Upgradeable.sol";
/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721EnumerableUpgradeable is IERC721Upgradeable {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);
    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165Upgradeable {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IBToken} from "../../interfaces/IBToken.sol";
import {IDebtToken} from "../../interfaces/IDebtToken.sol";
import {IInterestRate} from "../../interfaces/IInterestRate.sol";
import {ILendPoolAddressesProvider} from "../../interfaces/ILendPoolAddressesProvider.sol";
import {IReserveOracleGetter} from "../../interfaces/IReserveOracleGetter.sol";
import {INFTOracleGetter} from "../../interfaces/INFTOracleGetter.sol";
import {ILendPoolLoan} from "../../interfaces/ILendPoolLoan.sol";
import {ReserveLogic} from "./ReserveLogic.sol";
import {GenericLogic} from "./GenericLogic.sol";
import {ValidationLogic} from "./ValidationLogic.sol";
import {ReserveConfiguration} from "../configuration/ReserveConfiguration.sol";
import {NftConfiguration} from "../configuration/NftConfiguration.sol";
import {MathUtils} from "../math/MathUtils.sol";
import {WadRayMath} from "../math/WadRayMath.sol";
import {PercentageMath} from "../math/PercentageMath.sol";
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
import {IERC721Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
/**
 * @title LiquidateLogic library
 * @author Bend
 * @notice Implements the logic to liquidate feature
 */
library LiquidateLogic {
  using WadRayMath for uint256;
  using PercentageMath for uint256;
  using SafeERC20Upgradeable for IERC20Upgradeable;
  using ReserveLogic for DataTypes.ReserveData;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  using NftConfiguration for DataTypes.NftConfigurationMap;
  /**
   * @dev Emitted when a borrower's loan is auctioned.
   * @param user The address of the user initiating the auction
   * @param reserve The address of the underlying asset of the reserve
   * @param bidPrice The price of the underlying reserve given by the bidder
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param onBehalfOf The address that will be getting the NFT
   * @param loanId The loan ID of the NFT loans
   **/
  event Auction(
    address user,
    address indexed reserve,
    uint256 bidPrice,
    address indexed nftAsset,
    uint256 nftTokenId,
    address onBehalfOf,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted on redeem()
   * @param user The address of the user initiating the redeem(), providing the funds
   * @param reserve The address of the underlying asset of the reserve
   * @param borrowAmount The borrow amount repaid
   * @param nftAsset The address of the underlying NFT used as collateral
   * @param nftTokenId The token id of the underlying NFT used as collateral
   * @param loanId The loan ID of the NFT loans
   **/
  event Redeem(
    address user,
    address indexed reserve,
    uint256 borrowAmount,
    uint256 fineAmount,
    address indexed nftAsset,
    uint256 nftTokenId,
    address indexed borrower,
    uint256 loanId
  );
  /**
   * @dev Emitted when a borrower's loan is liquidated.
   * @param user The address of the user initiating the auction
   * @param reserve The address of the underlying asset of the reserve
   * @param repayAmount The amount of reserve repaid by the liquidator
   * @param remainAmount The amount of reserve received by the borrower
   * @param loanId The loan ID of the NFT loans
   **/
  event Liquidate(
    address user,
    address indexed reserve,
    uint256 repayAmount,
    uint256 remainAmount,
    address indexed nftAsset,
    uint256 nftTokenId,
    address indexed borrower,
    uint256 loanId
  );
  struct AuctionLocalVars {
    address loanAddress;
    address reserveOracle;
    address nftOracle;
    address initiator;
    uint256 loanId;
    uint256 thresholdPrice;
    uint256 liquidatePrice;
    uint256 borrowAmount;
    uint256 auctionEndTimestamp;
    uint256 minBidDelta;
    uint256 extraAuctionDuration;
  }
  /**
   * @notice Implements the auction feature. Through `auction()`, users auction assets in the protocol.
   * @dev Emits the `Auction()` event.
   * @param reservesData The state of all the reserves
   * @param nftsData The state of all the nfts
   * @param poolStates The state of the lend pool
   * @param params The additional parameters needed to execute the auction function
   */
  function executeAuction(
    ILendPoolAddressesProvider addressesProvider,
    mapping(address => DataTypes.ReserveData) storage reservesData,
    mapping(address => DataTypes.NftData) storage nftsData,
    DataTypes.ExecuteLendPoolStates memory poolStates,
    DataTypes.ExecuteAuctionParams memory params
  ) external {
    require(params.onBehalfOf != address(0), Errors.VL_INVALID_ONBEHALFOF_ADDRESS);
    AuctionLocalVars memory vars;
    vars.initiator = params.initiator;
    vars.loanAddress = addressesProvider.getLendPoolLoan();
    vars.reserveOracle = addressesProvider.getReserveOracle();
    vars.nftOracle = addressesProvider.getNFTOracle();
    vars.loanId = ILendPoolLoan(vars.loanAddress).getCollateralLoanId(params.nftAsset, params.nftTokenId);
    require(vars.loanId != 0, Errors.LP_NFT_IS_NOT_USED_AS_COLLATERAL);
    DataTypes.LoanData memory loanData = ILendPoolLoan(vars.loanAddress).getLoan(vars.loanId);
    DataTypes.ReserveData storage reserveData = reservesData[loanData.reserveAsset];
    DataTypes.NftData storage nftData = nftsData[loanData.nftAsset];
    ValidationLogic.validateAuction(reserveData, nftData, loanData, params.bidPrice);
    // update state MUST BEFORE get borrow amount which is depent on latest borrow index
    reserveData.updateState();
    (vars.borrowAmount, vars.thresholdPrice, vars.liquidatePrice) = GenericLogic.calculateLoanLiquidatePrice(
      vars.loanId,
      loanData.reserveAsset,
      reserveData,
      loanData.nftAsset,
      nftData,
      vars.loanAddress,
      vars.reserveOracle,
      vars.nftOracle
    );
    // first time bid need to burn debt tokens and transfer reserve to bTokens
    if (loanData.state == DataTypes.LoanState.Active) {
      // loan's accumulated debt must exceed threshold (heath factor below 1.0)
      require(vars.borrowAmount > vars.thresholdPrice, Errors.LP_BORROW_NOT_EXCEED_LIQUIDATION_THRESHOLD);
      // bid price must greater than liquidate price
      require(params.bidPrice >= vars.liquidatePrice, Errors.LPL_BID_PRICE_LESS_THAN_LIQUIDATION_PRICE);
      // bid price must greater than borrow debt
      require(params.bidPrice >= vars.borrowAmount, Errors.LPL_BID_PRICE_LESS_THAN_BORROW);
    } else {
      // bid price must greater than borrow debt
      require(params.bidPrice >= vars.borrowAmount, Errors.LPL_BID_PRICE_LESS_THAN_BORROW);
      if ((poolStates.pauseDurationTime > 0) && (loanData.bidStartTimestamp <= poolStates.pauseStartTime)) {
        vars.extraAuctionDuration = poolStates.pauseDurationTime;
      }
      vars.auctionEndTimestamp =
        loanData.bidStartTimestamp +
        vars.extraAuctionDuration +
        (nftData.configuration.getAuctionDuration() * 1 hours);
      require(block.timestamp <= vars.auctionEndTimestamp, Errors.LPL_BID_AUCTION_DURATION_HAS_END);
      // bid price must greater than highest bid + delta
      vars.minBidDelta = vars.borrowAmount.percentMul(PercentageMath.ONE_PERCENT);
      require(params.bidPrice >= (loanData.bidPrice + vars.minBidDelta), Errors.LPL_BID_PRICE_LESS_THAN_HIGHEST_PRICE);
    }
    ILendPoolLoan(vars.loanAddress).auctionLoan(
      vars.initiator,
      vars.loanId,
      params.onBehalfOf,
      params.bidPrice,
      vars.borrowAmount,
      reserveData.variableBorrowIndex
    );
    // lock highest bidder bid price amount to lend pool
    IERC20Upgradeable(loanData.reserveAsset).safeTransferFrom(vars.initiator, address(this), params.bidPrice);
    // transfer (return back) last bid price amount to previous bidder from lend pool
    if (loanData.bidderAddress != address(0)) {
      IERC20Upgradeable(loanData.reserveAsset).safeTransfer(loanData.bidderAddress, loanData.bidPrice);
    }
    // update interest rate according latest borrow amount (utilizaton)
    reserveData.updateInterestRates(loanData.reserveAsset, reserveData.bTokenAddress, 0, 0);
    emit Auction(
      vars.initiator,
      loanData.reserveAsset,
      params.bidPrice,
      params.nftAsset,
      params.nftTokenId,
      params.onBehalfOf,
      loanData.borrower,
      vars.loanId
    );
  }
  struct RedeemLocalVars {
    address initiator;
    address poolLoan;
    address reserveOracle;
    address nftOracle;
    uint256 loanId;
    uint256 borrowAmount;
    uint256 repayAmount;
    uint256 minRepayAmount;
    uint256 maxRepayAmount;
    uint256 bidFine;
    uint256 redeemEndTimestamp;
    uint256 minBidFinePct;
    uint256 minBidFine;
    uint256 extraRedeemDuration;
  }
  /**
   * @notice Implements the redeem feature. Through `redeem()`, users redeem assets in the protocol.
   * @dev Emits the `Redeem()` event.
   * @param reservesData The state of all the reserves
   * @param nftsData The state of all the nfts
   * @param poolStates The state of the lend pool
   * @param params The additional parameters needed to execute the redeem function
   */
  function executeRedeem(
    ILendPoolAddressesProvider addressesProvider,
    mapping(address => DataTypes.ReserveData) storage reservesData,
    mapping(address => DataTypes.NftData) storage nftsData,
    DataTypes.ExecuteLendPoolStates memory poolStates,
    DataTypes.ExecuteRedeemParams memory params
  ) external returns (uint256) {
    RedeemLocalVars memory vars;
    vars.initiator = params.initiator;
    vars.poolLoan = addressesProvider.getLendPoolLoan();
    vars.reserveOracle = addressesProvider.getReserveOracle();
    vars.nftOracle = addressesProvider.getNFTOracle();
    vars.loanId = ILendPoolLoan(vars.poolLoan).getCollateralLoanId(params.nftAsset, params.nftTokenId);
    require(vars.loanId != 0, Errors.LP_NFT_IS_NOT_USED_AS_COLLATERAL);
    DataTypes.LoanData memory loanData = ILendPoolLoan(vars.poolLoan).getLoan(vars.loanId);
    DataTypes.ReserveData storage reserveData = reservesData[loanData.reserveAsset];
    DataTypes.NftData storage nftData = nftsData[loanData.nftAsset];
    ValidationLogic.validateRedeem(reserveData, nftData, loanData, params.amount);
    if ((poolStates.pauseDurationTime > 0) && (loanData.bidStartTimestamp <= poolStates.pauseStartTime)) {
      vars.extraRedeemDuration = poolStates.pauseDurationTime;
    }
    vars.redeemEndTimestamp = (loanData.bidStartTimestamp +
      vars.extraRedeemDuration +
      nftData.configuration.getRedeemDuration() *
      1 hours);
    require(block.timestamp <= vars.redeemEndTimestamp, Errors.LPL_BID_REDEEM_DURATION_HAS_END);
    // update state MUST BEFORE get borrow amount which is depent on latest borrow index
    reserveData.updateState();
    (vars.borrowAmount, , ) = GenericLogic.calculateLoanLiquidatePrice(
      vars.loanId,
      loanData.reserveAsset,
      reserveData,
      loanData.nftAsset,
      nftData,
      vars.poolLoan,
      vars.reserveOracle,
      vars.nftOracle
    );
    // check bid fine in min & max range
    (, vars.bidFine) = GenericLogic.calculateLoanBidFine(
      loanData.reserveAsset,
      reserveData,
      loanData.nftAsset,
      nftData,
      loanData,
      vars.poolLoan,
      vars.reserveOracle
    );
    // check bid fine is enough
    require(vars.bidFine <= params.bidFine, Errors.LPL_INVALID_BID_FINE);
    // check the minimum debt repay amount, use redeem threshold in config
    vars.repayAmount = params.amount;
    vars.minRepayAmount = vars.borrowAmount.percentMul(nftData.configuration.getRedeemThreshold());
    require(vars.repayAmount >= vars.minRepayAmount, Errors.LP_AMOUNT_LESS_THAN_REDEEM_THRESHOLD);
    // check the maxinmum debt repay amount, 90%?
    vars.maxRepayAmount = vars.borrowAmount.percentMul(PercentageMath.PERCENTAGE_FACTOR - PercentageMath.TEN_PERCENT);
    require(vars.repayAmount <= vars.maxRepayAmount, Errors.LP_AMOUNT_GREATER_THAN_MAX_REPAY);
    ILendPoolLoan(vars.poolLoan).redeemLoan(
      vars.initiator,
      vars.loanId,
      vars.repayAmount,
      reserveData.variableBorrowIndex
    );
    IDebtToken(reserveData.debtTokenAddress).burn(loanData.borrower, vars.repayAmount, reserveData.variableBorrowIndex);
    // update interest rate according latest borrow amount (utilizaton)
    reserveData.updateInterestRates(loanData.reserveAsset, reserveData.bTokenAddress, vars.repayAmount, 0);
    // transfer repay amount from borrower to bToken
    IERC20Upgradeable(loanData.reserveAsset).safeTransferFrom(
      vars.initiator,
      reserveData.bTokenAddress,
      vars.repayAmount
    );
    if (loanData.bidderAddress != address(0)) {
      // transfer (return back) last bid price amount from lend pool to bidder
      IERC20Upgradeable(loanData.reserveAsset).safeTransfer(loanData.bidderAddress, loanData.bidPrice);
      // transfer bid penalty fine amount from borrower to the first bidder
      IERC20Upgradeable(loanData.reserveAsset).safeTransferFrom(
        vars.initiator,
        loanData.firstBidderAddress,
        vars.bidFine
      );
    }
    emit Redeem(
      vars.initiator,
      loanData.reserveAsset,
      vars.repayAmount,
      vars.bidFine,
      loanData.nftAsset,
      loanData.nftTokenId,
      loanData.borrower,
      vars.loanId
    );
    return (vars.repayAmount + vars.bidFine);
  }
  struct LiquidateLocalVars {
    address initiator;
    address poolLoan;
    address reserveOracle;
    address nftOracle;
    uint256 loanId;
    uint256 borrowAmount;
    uint256 extraDebtAmount;
    uint256 remainAmount;
    uint256 auctionEndTimestamp;
    uint256 extraAuctionDuration;
  }
  /**
   * @notice Implements the liquidate feature. Through `liquidate()`, users liquidate assets in the protocol.
   * @dev Emits the `Liquidate()` event.
   * @param reservesData The state of all the reserves
   * @param nftsData The state of all the nfts
   * @param poolStates The state of the lend pool
   * @param params The additional parameters needed to execute the liquidate function
   */
  function executeLiquidate(
    ILendPoolAddressesProvider addressesProvider,
    mapping(address => DataTypes.ReserveData) storage reservesData,
    mapping(address => DataTypes.NftData) storage nftsData,
    DataTypes.ExecuteLendPoolStates memory poolStates,
    DataTypes.ExecuteLiquidateParams memory params
  ) external returns (uint256) {
    LiquidateLocalVars memory vars;
    vars.initiator = params.initiator;
    vars.poolLoan = addressesProvider.getLendPoolLoan();
    vars.reserveOracle = addressesProvider.getReserveOracle();
    vars.nftOracle = addressesProvider.getNFTOracle();
    vars.loanId = ILendPoolLoan(vars.poolLoan).getCollateralLoanId(params.nftAsset, params.nftTokenId);
    require(vars.loanId != 0, Errors.LP_NFT_IS_NOT_USED_AS_COLLATERAL);
    DataTypes.LoanData memory loanData = ILendPoolLoan(vars.poolLoan).getLoan(vars.loanId);
    DataTypes.ReserveData storage reserveData = reservesData[loanData.reserveAsset];
    DataTypes.NftData storage nftData = nftsData[loanData.nftAsset];
    ValidationLogic.validateLiquidate(reserveData, nftData, loanData);
    if ((poolStates.pauseDurationTime > 0) && (loanData.bidStartTimestamp <= poolStates.pauseStartTime)) {
      vars.extraAuctionDuration = poolStates.pauseDurationTime;
    }
    vars.auctionEndTimestamp =
      loanData.bidStartTimestamp +
      vars.extraAuctionDuration +
      (nftData.configuration.getAuctionDuration() * 1 hours);
    require(block.timestamp > vars.auctionEndTimestamp, Errors.LPL_BID_AUCTION_DURATION_NOT_END);
    // update state MUST BEFORE get borrow amount which is depent on latest borrow index
    reserveData.updateState();
    (vars.borrowAmount, , ) = GenericLogic.calculateLoanLiquidatePrice(
      vars.loanId,
      loanData.reserveAsset,
      reserveData,
      loanData.nftAsset,
      nftData,
      vars.poolLoan,
      vars.reserveOracle,
      vars.nftOracle
    );
    // Last bid price can not cover borrow amount
    if (loanData.bidPrice < vars.borrowAmount) {
      vars.extraDebtAmount = vars.borrowAmount - loanData.bidPrice;
      require(params.amount >= vars.extraDebtAmount, Errors.LP_AMOUNT_LESS_THAN_EXTRA_DEBT);
    }
    if (loanData.bidPrice > vars.borrowAmount) {
      vars.remainAmount = loanData.bidPrice - vars.borrowAmount;
    }
    ILendPoolLoan(vars.poolLoan).liquidateLoan(
      loanData.bidderAddress,
      vars.loanId,
      nftData.bNftAddress,
      vars.borrowAmount,
      reserveData.variableBorrowIndex
    );
    IDebtToken(reserveData.debtTokenAddress).burn(
      loanData.borrower,
      vars.borrowAmount,
      reserveData.variableBorrowIndex
    );
    // update interest rate according latest borrow amount (utilizaton)
    reserveData.updateInterestRates(loanData.reserveAsset, reserveData.bTokenAddress, vars.borrowAmount, 0);
    // transfer extra borrow amount from liquidator to lend pool
    if (vars.extraDebtAmount > 0) {
      IERC20Upgradeable(loanData.reserveAsset).safeTransferFrom(vars.initiator, address(this), vars.extraDebtAmount);
    }
    // transfer borrow amount from lend pool to bToken, repay debt
    IERC20Upgradeable(loanData.reserveAsset).safeTransfer(reserveData.bTokenAddress, vars.borrowAmount);
    // transfer remain amount to borrower
    if (vars.remainAmount > 0) {
      IERC20Upgradeable(loanData.reserveAsset).safeTransfer(loanData.borrower, vars.remainAmount);
    }
    // transfer erc721 to bidder
    IERC721Upgradeable(loanData.nftAsset).safeTransferFrom(address(this), loanData.bidderAddress, params.nftTokenId);
    emit Liquidate(
      vars.initiator,
      loanData.reserveAsset,
      vars.borrowAmount,
      vars.remainAmount,
      loanData.nftAsset,
      loanData.nftTokenId,
      loanData.borrower,
      vars.loanId
    );
    return (vars.extraDebtAmount);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ILendPoolAddressesProvider} from "./ILendPoolAddressesProvider.sol";
import {IIncentivesController} from "./IIncentivesController.sol";
import {IScaledBalanceToken} from "./IScaledBalanceToken.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {IERC20MetadataUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/IERC20MetadataUpgradeable.sol";
interface IBToken is IScaledBalanceToken, IERC20Upgradeable, IERC20MetadataUpgradeable {
  /**
   * @dev Emitted when an bToken is initialized
   * @param underlyingAsset The address of the underlying asset
   * @param pool The address of the associated lending pool
   * @param treasury The address of the treasury
   * @param incentivesController The address of the incentives controller for this bToken
   **/
  event Initialized(
    address indexed underlyingAsset,
    address indexed pool,
    address treasury,
    address incentivesController
  );
  /**
   * @dev Initializes the bToken
   * @param addressProvider The address of the address provider where this bToken will be used
   * @param treasury The address of the Bend treasury, receiving the fees on this bToken
   * @param underlyingAsset The address of the underlying asset of this bToken
   */
  function initialize(
    ILendPoolAddressesProvider addressProvider,
    address treasury,
    address underlyingAsset,
    uint8 bTokenDecimals,
    string calldata bTokenName,
    string calldata bTokenSymbol
  ) external;
  /**
   * @dev Emitted after the mint action
   * @param from The address performing the mint
   * @param value The amount being
   * @param index The new liquidity index of the reserve
   **/
  event Mint(address indexed from, uint256 value, uint256 index);
  /**
   * @dev Mints `amount` bTokens to `user`
   * @param user The address receiving the minted tokens
   * @param amount The amount of tokens getting minted
   * @param index The new liquidity index of the reserve
   * @return `true` if the the previous balance of the user was 0
   */
  function mint(
    address user,
    uint256 amount,
    uint256 index
  ) external returns (bool);
  /**
   * @dev Emitted after bTokens are burned
   * @param from The owner of the bTokens, getting them burned
   * @param target The address that will receive the underlying
   * @param value The amount being burned
   * @param index The new liquidity index of the reserve
   **/
  event Burn(address indexed from, address indexed target, uint256 value, uint256 index);
  /**
   * @dev Emitted during the transfer action
   * @param from The user whose tokens are being transferred
   * @param to The recipient
   * @param value The amount being transferred
   * @param index The new liquidity index of the reserve
   **/
  event BalanceTransfer(address indexed from, address indexed to, uint256 value, uint256 index);
  /**
   * @dev Burns bTokens from `user` and sends the equivalent amount of underlying to `receiverOfUnderlying`
   * @param user The owner of the bTokens, getting them burned
   * @param receiverOfUnderlying The address that will receive the underlying
   * @param amount The amount being burned
   * @param index The new liquidity index of the reserve
   **/
  function burn(
    address user,
    address receiverOfUnderlying,
    uint256 amount,
    uint256 index
  ) external;
  /**
   * @dev Mints bTokens to the reserve treasury
   * @param amount The amount of tokens getting minted
   * @param index The new liquidity index of the reserve
   */
  function mintToTreasury(uint256 amount, uint256 index) external;
  /**
   * @dev Transfers the underlying asset to `target`. Used by the LendPool to transfer
   * assets in borrow(), withdraw() and flashLoan()
   * @param user The recipient of the underlying
   * @param amount The amount getting transferred
   * @return The amount transferred
   **/
  function transferUnderlyingTo(address user, uint256 amount) external returns (uint256);
  /**
   * @dev Returns the address of the incentives controller contract
   **/
  function getIncentivesController() external view returns (IIncentivesController);
  /**
   * @dev Returns the address of the underlying asset of this bToken
   **/
  function UNDERLYING_ASSET_ADDRESS() external view returns (address);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ILendPoolAddressesProvider} from "../interfaces/ILendPoolAddressesProvider.sol";
import {IIncentivesController} from "./IIncentivesController.sol";
import {IScaledBalanceToken} from "./IScaledBalanceToken.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {IERC20MetadataUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/IERC20MetadataUpgradeable.sol";
/**
 * @title IDebtToken
 * @author Bend
 * @notice Defines the basic interface for a debt token.
 **/
interface IDebtToken is IScaledBalanceToken, IERC20Upgradeable, IERC20MetadataUpgradeable {
  /**
   * @dev Emitted when a debt token is initialized
   * @param underlyingAsset The address of the underlying asset
   * @param pool The address of the associated lend pool
   * @param incentivesController The address of the incentives controller
   * @param debtTokenDecimals the decimals of the debt token
   * @param debtTokenName the name of the debt token
   * @param debtTokenSymbol the symbol of the debt token
   **/
  event Initialized(
    address indexed underlyingAsset,
    address indexed pool,
    address incentivesController,
    uint8 debtTokenDecimals,
    string debtTokenName,
    string debtTokenSymbol
  );
  /**
   * @dev Initializes the debt token.
   * @param addressProvider The address of the lend pool
   * @param underlyingAsset The address of the underlying asset
   * @param debtTokenDecimals The decimals of the debtToken, same as the underlying asset's
   * @param debtTokenName The name of the token
   * @param debtTokenSymbol The symbol of the token
   */
  function initialize(
    ILendPoolAddressesProvider addressProvider,
    address underlyingAsset,
    uint8 debtTokenDecimals,
    string memory debtTokenName,
    string memory debtTokenSymbol
  ) external;
  /**
   * @dev Emitted after the mint action
   * @param from The address performing the mint
   * @param value The amount to be minted
   * @param index The last index of the reserve
   **/
  event Mint(address indexed from, uint256 value, uint256 index);
  /**
   * @dev Mints debt token to the `user` address
   * @param user The address receiving the borrowed underlying
   * @param amount The amount of debt being minted
   * @param index The variable debt index of the reserve
   * @return `true` if the the previous balance of the user is 0
   **/
  function mint(
    address user,
    address onBehalfOf,
    uint256 amount,
    uint256 index
  ) external returns (bool);
  /**
   * @dev Emitted when variable debt is burnt
   * @param user The user which debt has been burned
   * @param amount The amount of debt being burned
   * @param index The index of the user
   **/
  event Burn(address indexed user, uint256 amount, uint256 index);
  /**
   * @dev Burns user variable debt
   * @param user The user which debt is burnt
   * @param index The variable debt index of the reserve
   **/
  function burn(
    address user,
    uint256 amount,
    uint256 index
  ) external;
  /**
   * @dev Returns the address of the incentives controller contract
   **/
  function getIncentivesController() external view returns (IIncentivesController);
  /**
   * @dev delegates borrowing power to a user on the specific debt token
   * @param delegatee the address receiving the delegated borrowing power
   * @param amount the maximum amount being delegated. Delegation will still
   * respect the liquidation constraints (even if delegated, a delegatee cannot
   * force a delegator HF to go below 1)
   **/
  function approveDelegation(address delegatee, uint256 amount) external;
  /**
   * @dev returns the borrow allowance of the user
   * @param fromUser The user to giving allowance
   * @param toUser The user to give allowance to
   * @return the current allowance of toUser
   **/
  function borrowAllowance(address fromUser, address toUser) external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title IInterestRate interface
 * @dev Interface for the calculation of the interest rates
 * @author Bend
 */
interface IInterestRate {
  function baseVariableBorrowRate() external view returns (uint256);
  function getMaxVariableBorrowRate() external view returns (uint256);
  function calculateInterestRates(
    address reserve,
    uint256 availableLiquidity,
    uint256 totalVariableDebt,
    uint256 reserveFactor
  ) external view returns (uint256, uint256);
  function calculateInterestRates(
    address reserve,
    address bToken,
    uint256 liquidityAdded,
    uint256 liquidityTaken,
    uint256 totalVariableDebt,
    uint256 reserveFactor
  ) external view returns (uint256 liquidityRate, uint256 variableBorrowRate);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title LendPoolAddressesProvider contract
 * @dev Main registry of addresses part of or connected to the protocol, including permissioned roles
 * - Acting also as factory of proxies and admin of those, so with right to change its implementations
 * - Owned by the Bend Governance
 * @author Bend
 **/
interface ILendPoolAddressesProvider {
  event MarketIdSet(string newMarketId);
  event LendPoolUpdated(address indexed newAddress, bytes encodedCallData);
  event ConfigurationAdminUpdated(address indexed newAddress);
  event EmergencyAdminUpdated(address indexed newAddress);
  event LendPoolConfiguratorUpdated(address indexed newAddress, bytes encodedCallData);
  event ReserveOracleUpdated(address indexed newAddress);
  event NftOracleUpdated(address indexed newAddress);
  event LendPoolLoanUpdated(address indexed newAddress, bytes encodedCallData);
  event ProxyCreated(bytes32 id, address indexed newAddress);
  event AddressSet(bytes32 id, address indexed newAddress, bool hasProxy, bytes encodedCallData);
  event BNFTRegistryUpdated(address indexed newAddress);
  event IncentivesControllerUpdated(address indexed newAddress);
  event UIDataProviderUpdated(address indexed newAddress);
  event BendDataProviderUpdated(address indexed newAddress);
  event WalletBalanceProviderUpdated(address indexed newAddress);
  function getMarketId() external view returns (string memory);
  function setMarketId(string calldata marketId) external;
  function setAddress(bytes32 id, address newAddress) external;
  function setAddressAsProxy(
    bytes32 id,
    address impl,
    bytes memory encodedCallData
  ) external;
  function getAddress(bytes32 id) external view returns (address);
  function getLendPool() external view returns (address);
  function setLendPoolImpl(address pool, bytes memory encodedCallData) external;
  function getLendPoolConfigurator() external view returns (address);
  function setLendPoolConfiguratorImpl(address configurator, bytes memory encodedCallData) external;
  function getPoolAdmin() external view returns (address);
  function setPoolAdmin(address admin) external;
  function getEmergencyAdmin() external view returns (address);
  function setEmergencyAdmin(address admin) external;
  function getReserveOracle() external view returns (address);
  function setReserveOracle(address reserveOracle) external;
  function getNFTOracle() external view returns (address);
  function setNFTOracle(address nftOracle) external;
  function getLendPoolLoan() external view returns (address);
  function setLendPoolLoanImpl(address loan, bytes memory encodedCallData) external;
  function getBNFTRegistry() external view returns (address);
  function setBNFTRegistry(address factory) external;
  function getIncentivesController() external view returns (address);
  function setIncentivesController(address controller) external;
  function getUIDataProvider() external view returns (address);
  function setUIDataProvider(address provider) external;
  function getBendDataProvider() external view returns (address);
  function setBendDataProvider(address provider) external;
  function getWalletBalanceProvider() external view returns (address);
  function setWalletBalanceProvider(address provider) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/************
@title IReserveOracleGetter interface
@notice Interface for getting Reserve price oracle.*/
interface IReserveOracleGetter {
  /* CAUTION: Price uint is ETH based (WEI, 18 decimals) */
  /***********
    @dev returns the asset price in ETH
     */
  function getAssetPrice(address asset) external view returns (uint256);
  // get twap price depending on _period
  function getTwapPrice(address _priceFeedKey, uint256 _interval) external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/************
@title INFTOracleGetter interface
@notice Interface for getting NFT price oracle.*/
interface INFTOracleGetter {
  /* CAUTION: Price uint is ETH based (WEI, 18 decimals) */
  /***********
    @dev returns the asset price in ETH
     */
  function getAssetPrice(address asset) external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {DataTypes} from "../libraries/types/DataTypes.sol";
interface ILendPoolLoan {
  /**
   * @dev Emitted on initialization to share location of dependent notes
   * @param pool The address of the associated lend pool
   */
  event Initialized(address indexed pool);
  /**
   * @dev Emitted when a loan is created
   * @param user The address initiating the action
   */
  event LoanCreated(
    address indexed user,
    address indexed onBehalfOf,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  );
  /**
   * @dev Emitted when a loan is updated
   * @param user The address initiating the action
   */
  event LoanUpdated(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amountAdded,
    uint256 amountTaken,
    uint256 borrowIndex
  );
  /**
   * @dev Emitted when a loan is repaid by the borrower
   * @param user The address initiating the action
   */
  event LoanRepaid(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  );
  /**
   * @dev Emitted when a loan is auction by the liquidator
   * @param user The address initiating the action
   */
  event LoanAuctioned(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    uint256 amount,
    uint256 borrowIndex,
    address bidder,
    uint256 price,
    address previousBidder,
    uint256 previousPrice
  );
  /**
   * @dev Emitted when a loan is redeemed
   * @param user The address initiating the action
   */
  event LoanRedeemed(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amountTaken,
    uint256 borrowIndex
  );
  /**
   * @dev Emitted when a loan is liquidate by the liquidator
   * @param user The address initiating the action
   */
  event LoanLiquidated(
    address indexed user,
    uint256 indexed loanId,
    address nftAsset,
    uint256 nftTokenId,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  );
  function initNft(address nftAsset, address bNftAddress) external;
  /**
   * @dev Create store a loan object with some params
   * @param initiator The address of the user initiating the borrow
   * @param onBehalfOf The address receiving the loan
   */
  function createLoan(
    address initiator,
    address onBehalfOf,
    address nftAsset,
    uint256 nftTokenId,
    address bNftAddress,
    address reserveAsset,
    uint256 amount,
    uint256 borrowIndex
  ) external returns (uint256);
  /**
   * @dev Update the given loan with some params
   *
   * Requirements:
   *  - The caller must be a holder of the loan
   *  - The loan must be in state Active
   * @param initiator The address of the user initiating the borrow
   */
  function updateLoan(
    address initiator,
    uint256 loanId,
    uint256 amountAdded,
    uint256 amountTaken,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Repay the given loan
   *
   * Requirements:
   *  - The caller must be a holder of the loan
   *  - The caller must send in principal + interest
   *  - The loan must be in state Active
   *
   * @param initiator The address of the user initiating the repay
   * @param loanId The loan getting burned
   * @param bNftAddress The address of bNFT
   */
  function repayLoan(
    address initiator,
    uint256 loanId,
    address bNftAddress,
    uint256 amount,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Auction the given loan
   *
   * Requirements:
   *  - The price must be greater than current highest price
   *  - The loan must be in state Active or Auction
   *
   * @param initiator The address of the user initiating the auction
   * @param loanId The loan getting auctioned
   * @param bidPrice The bid price of this auction
   */
  function auctionLoan(
    address initiator,
    uint256 loanId,
    address onBehalfOf,
    uint256 bidPrice,
    uint256 borrowAmount,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Redeem the given loan with some params
   *
   * Requirements:
   *  - The caller must be a holder of the loan
   *  - The loan must be in state Auction
   * @param initiator The address of the user initiating the borrow
   */
  function redeemLoan(
    address initiator,
    uint256 loanId,
    uint256 amountTaken,
    uint256 borrowIndex
  ) external;
  /**
   * @dev Liquidate the given loan
   *
   * Requirements:
   *  - The caller must send in principal + interest
   *  - The loan must be in state Active
   *
   * @param initiator The address of the user initiating the auction
   * @param loanId The loan getting burned
   * @param bNftAddress The address of bNFT
   */
  function liquidateLoan(
    address initiator,
    uint256 loanId,
    address bNftAddress,
    uint256 borrowAmount,
    uint256 borrowIndex
  ) external;
  function borrowerOf(uint256 loanId) external view returns (address);
  function getCollateralLoanId(address nftAsset, uint256 nftTokenId) external view returns (uint256);
  function getLoan(uint256 loanId) external view returns (DataTypes.LoanData memory loanData);
  function getLoanCollateralAndReserve(uint256 loanId)
    external
    view
    returns (
      address nftAsset,
      uint256 nftTokenId,
      address reserveAsset,
      uint256 scaledAmount
    );
  function getLoanReserveBorrowScaledAmount(uint256 loanId) external view returns (address, uint256);
  function getLoanReserveBorrowAmount(uint256 loanId) external view returns (address, uint256);
  function getLoanHighestBid(uint256 loanId) external view returns (address, uint256);
  function getNftCollateralAmount(address nftAsset) external view returns (uint256);
  function getUserNftCollateralAmount(address user, address nftAsset) external view returns (uint256);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {IBToken} from "../../interfaces/IBToken.sol";
import {IDebtToken} from "../../interfaces/IDebtToken.sol";
import {IInterestRate} from "../../interfaces/IInterestRate.sol";
import {ReserveConfiguration} from "../configuration/ReserveConfiguration.sol";
import {MathUtils} from "../math/MathUtils.sol";
import {WadRayMath} from "../math/WadRayMath.sol";
import {PercentageMath} from "../math/PercentageMath.sol";
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
/**
 * @title ReserveLogic library
 * @author Bend
 * @notice Implements the logic to update the reserves state
 */
library ReserveLogic {
  using WadRayMath for uint256;
  using PercentageMath for uint256;
  using SafeERC20Upgradeable for IERC20Upgradeable;
  /**
   * @dev Emitted when the state of a reserve is updated
   * @param asset The address of the underlying asset of the reserve
   * @param liquidityRate The new liquidity rate
   * @param variableBorrowRate The new variable borrow rate
   * @param liquidityIndex The new liquidity index
   * @param variableBorrowIndex The new variable borrow index
   **/
  event ReserveDataUpdated(
    address indexed asset,
    uint256 liquidityRate,
    uint256 variableBorrowRate,
    uint256 liquidityIndex,
    uint256 variableBorrowIndex
  );
  using ReserveLogic for DataTypes.ReserveData;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  /**
   * @dev Returns the ongoing normalized income for the reserve
   * A value of 1e27 means there is no income. As time passes, the income is accrued
   * A value of 2*1e27 means for each unit of asset one unit of income has been accrued
   * @param reserve The reserve object
   * @return the normalized income. expressed in ray
   **/
  function getNormalizedIncome(DataTypes.ReserveData storage reserve) internal view returns (uint256) {
    uint40 timestamp = reserve.lastUpdateTimestamp;
    //solium-disable-next-line
    if (timestamp == uint40(block.timestamp)) {
      //if the index was updated in the same block, no need to perform any calculation
      return reserve.liquidityIndex;
    }
    uint256 cumulated = MathUtils.calculateLinearInterest(reserve.currentLiquidityRate, timestamp).rayMul(
      reserve.liquidityIndex
    );
    return cumulated;
  }
  /**
   * @dev Returns the ongoing normalized variable debt for the reserve
   * A value of 1e27 means there is no debt. As time passes, the income is accrued
   * A value of 2*1e27 means that for each unit of debt, one unit worth of interest has been accumulated
   * @param reserve The reserve object
   * @return The normalized variable debt. expressed in ray
   **/
  function getNormalizedDebt(DataTypes.ReserveData storage reserve) internal view returns (uint256) {
    uint40 timestamp = reserve.lastUpdateTimestamp;
    //solium-disable-next-line
    if (timestamp == uint40(block.timestamp)) {
      //if the index was updated in the same block, no need to perform any calculation
      return reserve.variableBorrowIndex;
    }
    uint256 cumulated = MathUtils.calculateCompoundedInterest(reserve.currentVariableBorrowRate, timestamp).rayMul(
      reserve.variableBorrowIndex
    );
    return cumulated;
  }
  /**
   * @dev Updates the liquidity cumulative index and the variable borrow index.
   * @param reserve the reserve object
   **/
  function updateState(DataTypes.ReserveData storage reserve) internal {
    uint256 scaledVariableDebt = IDebtToken(reserve.debtTokenAddress).scaledTotalSupply();
    uint256 previousVariableBorrowIndex = reserve.variableBorrowIndex;
    uint256 previousLiquidityIndex = reserve.liquidityIndex;
    uint40 lastUpdatedTimestamp = reserve.lastUpdateTimestamp;
    (uint256 newLiquidityIndex, uint256 newVariableBorrowIndex) = _updateIndexes(
      reserve,
      scaledVariableDebt,
      previousLiquidityIndex,
      previousVariableBorrowIndex,
      lastUpdatedTimestamp
    );
    _mintToTreasury(
      reserve,
      scaledVariableDebt,
      previousVariableBorrowIndex,
      newLiquidityIndex,
      newVariableBorrowIndex,
      lastUpdatedTimestamp
    );
  }
  /**
   * @dev Accumulates a predefined amount of asset to the reserve as a fixed, instantaneous income. Used for example to accumulate
   * the flashloan fee to the reserve, and spread it between all the depositors
   * @param reserve The reserve object
   * @param totalLiquidity The total liquidity available in the reserve
   * @param amount The amount to accomulate
   **/
  function cumulateToLiquidityIndex(
    DataTypes.ReserveData storage reserve,
    uint256 totalLiquidity,
    uint256 amount
  ) internal {
    uint256 amountToLiquidityRatio = amount.wadToRay().rayDiv(totalLiquidity.wadToRay());
    uint256 result = amountToLiquidityRatio + (WadRayMath.ray());
    result = result.rayMul(reserve.liquidityIndex);
    require(result <= type(uint128).max, Errors.RL_LIQUIDITY_INDEX_OVERFLOW);
    reserve.liquidityIndex = uint128(result);
  }
  /**
   * @dev Initializes a reserve
   * @param reserve The reserve object
   * @param bTokenAddress The address of the overlying bToken contract
   * @param debtTokenAddress The address of the overlying debtToken contract
   * @param interestRateAddress The address of the interest rate strategy contract
   **/
  function init(
    DataTypes.ReserveData storage reserve,
    address bTokenAddress,
    address debtTokenAddress,
    address interestRateAddress
  ) external {
    require(reserve.bTokenAddress == address(0), Errors.RL_RESERVE_ALREADY_INITIALIZED);
    reserve.liquidityIndex = uint128(WadRayMath.ray());
    reserve.variableBorrowIndex = uint128(WadRayMath.ray());
    reserve.bTokenAddress = bTokenAddress;
    reserve.debtTokenAddress = debtTokenAddress;
    reserve.interestRateAddress = interestRateAddress;
  }
  struct UpdateInterestRatesLocalVars {
    uint256 availableLiquidity;
    uint256 newLiquidityRate;
    uint256 newVariableRate;
    uint256 totalVariableDebt;
  }
  /**
   * @dev Updates the reserve current stable borrow rate, the current variable borrow rate and the current liquidity rate
   * @param reserve The address of the reserve to be updated
   * @param liquidityAdded The amount of liquidity added to the protocol (deposit or repay) in the previous action
   * @param liquidityTaken The amount of liquidity taken from the protocol (withdraw or borrow)
   **/
  function updateInterestRates(
    DataTypes.ReserveData storage reserve,
    address reserveAddress,
    address bTokenAddress,
    uint256 liquidityAdded,
    uint256 liquidityTaken
  ) internal {
    UpdateInterestRatesLocalVars memory vars;
    //calculates the total variable debt locally using the scaled borrow amount instead
    //of borrow amount(), as it's noticeably cheaper. Also, the index has been
    //updated by the previous updateState() call
    vars.totalVariableDebt = IDebtToken(reserve.debtTokenAddress).scaledTotalSupply().rayMul(
      reserve.variableBorrowIndex
    );
    (vars.newLiquidityRate, vars.newVariableRate) = IInterestRate(reserve.interestRateAddress).calculateInterestRates(
      reserveAddress,
      bTokenAddress,
      liquidityAdded,
      liquidityTaken,
      vars.totalVariableDebt,
      reserve.configuration.getReserveFactor()
    );
    require(vars.newLiquidityRate <= type(uint128).max, Errors.RL_LIQUIDITY_RATE_OVERFLOW);
    require(vars.newVariableRate <= type(uint128).max, Errors.RL_VARIABLE_BORROW_RATE_OVERFLOW);
    reserve.currentLiquidityRate = uint128(vars.newLiquidityRate);
    reserve.currentVariableBorrowRate = uint128(vars.newVariableRate);
    emit ReserveDataUpdated(
      reserveAddress,
      vars.newLiquidityRate,
      vars.newVariableRate,
      reserve.liquidityIndex,
      reserve.variableBorrowIndex
    );
  }
  struct MintToTreasuryLocalVars {
    uint256 currentVariableDebt;
    uint256 previousVariableDebt;
    uint256 totalDebtAccrued;
    uint256 amountToMint;
    uint256 reserveFactor;
  }
  /**
   * @dev Mints part of the repaid interest to the reserve treasury as a function of the reserveFactor for the
   * specific asset.
   * @param reserve The reserve reserve to be updated
   * @param scaledVariableDebt The current scaled total variable debt
   * @param previousVariableBorrowIndex The variable borrow index before the last accumulation of the interest
   * @param newLiquidityIndex The new liquidity index
   * @param newVariableBorrowIndex The variable borrow index after the last accumulation of the interest
   **/
  function _mintToTreasury(
    DataTypes.ReserveData storage reserve,
    uint256 scaledVariableDebt,
    uint256 previousVariableBorrowIndex,
    uint256 newLiquidityIndex,
    uint256 newVariableBorrowIndex,
    uint40 timestamp
  ) internal {
    timestamp;
    MintToTreasuryLocalVars memory vars;
    vars.reserveFactor = reserve.configuration.getReserveFactor();
    if (vars.reserveFactor == 0) {
      return;
    }
    //calculate the last principal variable debt
    vars.previousVariableDebt = scaledVariableDebt.rayMul(previousVariableBorrowIndex);
    //calculate the new total supply after accumulation of the index
    vars.currentVariableDebt = scaledVariableDebt.rayMul(newVariableBorrowIndex);
    //debt accrued is the sum of the current debt minus the sum of the debt at the last update
    vars.totalDebtAccrued = vars.currentVariableDebt - (vars.previousVariableDebt);
    vars.amountToMint = vars.totalDebtAccrued.percentMul(vars.reserveFactor);
    if (vars.amountToMint != 0) {
      IBToken(reserve.bTokenAddress).mintToTreasury(vars.amountToMint, newLiquidityIndex);
    }
  }
  /**
   * @dev Updates the reserve indexes and the timestamp of the update
   * @param reserve The reserve reserve to be updated
   * @param scaledVariableDebt The scaled variable debt
   * @param liquidityIndex The last stored liquidity index
   * @param variableBorrowIndex The last stored variable borrow index
   **/
  function _updateIndexes(
    DataTypes.ReserveData storage reserve,
    uint256 scaledVariableDebt,
    uint256 liquidityIndex,
    uint256 variableBorrowIndex,
    uint40 timestamp
  ) internal returns (uint256, uint256) {
    uint256 currentLiquidityRate = reserve.currentLiquidityRate;
    uint256 newLiquidityIndex = liquidityIndex;
    uint256 newVariableBorrowIndex = variableBorrowIndex;
    //only cumulating if there is any income being produced
    if (currentLiquidityRate > 0) {
      uint256 cumulatedLiquidityInterest = MathUtils.calculateLinearInterest(currentLiquidityRate, timestamp);
      newLiquidityIndex = cumulatedLiquidityInterest.rayMul(liquidityIndex);
      require(newLiquidityIndex <= type(uint128).max, Errors.RL_LIQUIDITY_INDEX_OVERFLOW);
      reserve.liquidityIndex = uint128(newLiquidityIndex);
      //as the liquidity rate might come only from stable rate loans, we need to ensure
      //that there is actual variable debt before accumulating
      if (scaledVariableDebt != 0) {
        uint256 cumulatedVariableBorrowInterest = MathUtils.calculateCompoundedInterest(
          reserve.currentVariableBorrowRate,
          timestamp
        );
        newVariableBorrowIndex = cumulatedVariableBorrowInterest.rayMul(variableBorrowIndex);
        require(newVariableBorrowIndex <= type(uint128).max, Errors.RL_VARIABLE_BORROW_INDEX_OVERFLOW);
        reserve.variableBorrowIndex = uint128(newVariableBorrowIndex);
      }
    }
    //solium-disable-next-line
    reserve.lastUpdateTimestamp = uint40(block.timestamp);
    return (newLiquidityIndex, newVariableBorrowIndex);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ILendPoolLoan} from "../../interfaces/ILendPoolLoan.sol";
import {IReserveOracleGetter} from "../../interfaces/IReserveOracleGetter.sol";
import {INFTOracleGetter} from "../../interfaces/INFTOracleGetter.sol";
import {WadRayMath} from "../math/WadRayMath.sol";
import {PercentageMath} from "../math/PercentageMath.sol";
import {ReserveConfiguration} from "../configuration/ReserveConfiguration.sol";
import {NftConfiguration} from "../configuration/NftConfiguration.sol";
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
import {ReserveLogic} from "./ReserveLogic.sol";
/**
 * @title GenericLogic library
 * @author Bend
 * @notice Implements protocol-level logic to calculate and validate the state of a user
 */
library GenericLogic {
  using ReserveLogic for DataTypes.ReserveData;
  using WadRayMath for uint256;
  using PercentageMath for uint256;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  using NftConfiguration for DataTypes.NftConfigurationMap;
  uint256 public constant HEALTH_FACTOR_LIQUIDATION_THRESHOLD = 1 ether;
  struct CalculateLoanDataVars {
    uint256 reserveUnitPrice;
    uint256 reserveUnit;
    uint256 reserveDecimals;
    uint256 healthFactor;
    uint256 totalCollateralInETH;
    uint256 totalCollateralInReserve;
    uint256 totalDebtInETH;
    uint256 totalDebtInReserve;
    uint256 nftLtv;
    uint256 nftLiquidationThreshold;
    address nftAsset;
    uint256 nftTokenId;
    uint256 nftUnitPrice;
  }
  /**
   * @dev Calculates the nft loan data.
   * this includes the total collateral/borrow balances in Reserve,
   * the Loan To Value, the Liquidation Ratio, and the Health factor.
   * @param reserveData Data of the reserve
   * @param nftData Data of the nft
   * @param reserveOracle The price oracle address of reserve
   * @param nftOracle The price oracle address of nft
   * @return The total collateral and total debt of the loan in Reserve, the ltv, liquidation threshold and the HF
   **/
  function calculateLoanData(
    address reserveAddress,
    DataTypes.ReserveData storage reserveData,
    address nftAddress,
    DataTypes.NftData storage nftData,
    address loanAddress,
    uint256 loanId,
    address reserveOracle,
    address nftOracle
  )
    internal
    view
    returns (
      uint256,
      uint256,
      uint256
    )
  {
    CalculateLoanDataVars memory vars;
    (vars.nftLtv, vars.nftLiquidationThreshold, ) = nftData.configuration.getCollateralParams();
    // calculate total borrow balance for the loan
    if (loanId != 0) {
      (vars.totalDebtInETH, vars.totalDebtInReserve) = calculateNftDebtData(
        reserveAddress,
        reserveData,
        loanAddress,
        loanId,
        reserveOracle
      );
    }
    // calculate total collateral balance for the nft
    (vars.totalCollateralInETH, vars.totalCollateralInReserve) = calculateNftCollateralData(
      reserveAddress,
      reserveData,
      nftAddress,
      nftData,
      reserveOracle,
      nftOracle
    );
    // calculate health by borrow and collateral
    vars.healthFactor = calculateHealthFactorFromBalances(
      vars.totalCollateralInReserve,
      vars.totalDebtInReserve,
      vars.nftLiquidationThreshold
    );
    return (vars.totalCollateralInReserve, vars.totalDebtInReserve, vars.healthFactor);
  }
  function calculateNftDebtData(
    address reserveAddress,
    DataTypes.ReserveData storage reserveData,
    address loanAddress,
    uint256 loanId,
    address reserveOracle
  ) internal view returns (uint256, uint256) {
    CalculateLoanDataVars memory vars;
    // all asset price has converted to ETH based, unit is in WEI (18 decimals)
    vars.reserveDecimals = reserveData.configuration.getDecimals();
    vars.reserveUnit = 10**vars.reserveDecimals;
    vars.reserveUnitPrice = IReserveOracleGetter(reserveOracle).getAssetPrice(reserveAddress);
    (, vars.totalDebtInReserve) = ILendPoolLoan(loanAddress).getLoanReserveBorrowAmount(loanId);
    vars.totalDebtInETH = (vars.totalDebtInReserve * vars.reserveUnitPrice) / vars.reserveUnit;
    return (vars.totalDebtInETH, vars.totalDebtInReserve);
  }
  function calculateNftCollateralData(
    address reserveAddress,
    DataTypes.ReserveData storage reserveData,
    address nftAddress,
    DataTypes.NftData storage nftData,
    address reserveOracle,
    address nftOracle
  ) internal view returns (uint256, uint256) {
    reserveData;
    nftData;
    CalculateLoanDataVars memory vars;
    // calculate total collateral balance for the nft
    // all asset price has converted to ETH based, unit is in WEI (18 decimals)
    vars.nftUnitPrice = INFTOracleGetter(nftOracle).getAssetPrice(nftAddress);
    vars.totalCollateralInETH = vars.nftUnitPrice;
    if (reserveAddress != address(0)) {
      vars.reserveDecimals = reserveData.configuration.getDecimals();
      vars.reserveUnit = 10**vars.reserveDecimals;
      vars.reserveUnitPrice = IReserveOracleGetter(reserveOracle).getAssetPrice(reserveAddress);
      vars.totalCollateralInReserve = (vars.totalCollateralInETH * vars.reserveUnit) / vars.reserveUnitPrice;
    }
    return (vars.totalCollateralInETH, vars.totalCollateralInReserve);
  }
  /**
   * @dev Calculates the health factor from the corresponding balances
   * @param totalCollateral The total collateral
   * @param totalDebt The total debt
   * @param liquidationThreshold The avg liquidation threshold
   * @return The health factor calculated from the balances provided
   **/
  function calculateHealthFactorFromBalances(
    uint256 totalCollateral,
    uint256 totalDebt,
    uint256 liquidationThreshold
  ) internal pure returns (uint256) {
    if (totalDebt == 0) return type(uint256).max;
    return (totalCollateral.percentMul(liquidationThreshold)).wadDiv(totalDebt);
  }
  /**
   * @dev Calculates the equivalent amount that an user can borrow, depending on the available collateral and the
   * average Loan To Value
   * @param totalCollateral The total collateral
   * @param totalDebt The total borrow balance
   * @param ltv The average loan to value
   * @return the amount available to borrow for the user
   **/
  function calculateAvailableBorrows(
    uint256 totalCollateral,
    uint256 totalDebt,
    uint256 ltv
  ) internal pure returns (uint256) {
    uint256 availableBorrows = totalCollateral.percentMul(ltv);
    if (availableBorrows < totalDebt) {
      return 0;
    }
    availableBorrows = availableBorrows - totalDebt;
    return availableBorrows;
  }
  struct CalcLiquidatePriceLocalVars {
    uint256 ltv;
    uint256 liquidationThreshold;
    uint256 liquidationBonus;
    uint256 nftPriceInETH;
    uint256 nftPriceInReserve;
    uint256 reserveDecimals;
    uint256 reservePriceInETH;
    uint256 thresholdPrice;
    uint256 liquidatePrice;
    uint256 borrowAmount;
  }
  function calculateLoanLiquidatePrice(
    uint256 loanId,
    address reserveAsset,
    DataTypes.ReserveData storage reserveData,
    address nftAsset,
    DataTypes.NftData storage nftData,
    address poolLoan,
    address reserveOracle,
    address nftOracle
  )
    internal
    view
    returns (
      uint256,
      uint256,
      uint256
    )
  {
    CalcLiquidatePriceLocalVars memory vars;
    /*
     * 0                   CR                  LH                  100
     * |___________________|___________________|___________________|
     *  <       Borrowing with Interest        <
     * CR: Callteral Ratio;
     * LH: Liquidate Threshold;
     * Liquidate Trigger: Borrowing with Interest > thresholdPrice;
     * Liquidate Price: (100% - BonusRatio) * NFT Price;
     */
    vars.reserveDecimals = reserveData.configuration.getDecimals();
    (, vars.borrowAmount) = ILendPoolLoan(poolLoan).getLoanReserveBorrowAmount(loanId);
    (vars.ltv, vars.liquidationThreshold, vars.liquidationBonus) = nftData.configuration.getCollateralParams();
    vars.nftPriceInETH = INFTOracleGetter(nftOracle).getAssetPrice(nftAsset);
    vars.reservePriceInETH = IReserveOracleGetter(reserveOracle).getAssetPrice(reserveAsset);
    vars.nftPriceInReserve = ((10**vars.reserveDecimals) * vars.nftPriceInETH) / vars.reservePriceInETH;
    vars.thresholdPrice = vars.nftPriceInReserve.percentMul(vars.liquidationThreshold);
    vars.liquidatePrice = vars.nftPriceInReserve.percentMul(PercentageMath.PERCENTAGE_FACTOR - vars.liquidationBonus);
    return (vars.borrowAmount, vars.thresholdPrice, vars.liquidatePrice);
  }
  struct CalcLoanBidFineLocalVars {
    uint256 reserveDecimals;
    uint256 reservePriceInETH;
    uint256 baseBidFineInReserve;
    uint256 minBidFinePct;
    uint256 minBidFineInReserve;
    uint256 bidFineInReserve;
    uint256 debtAmount;
  }
  function calculateLoanBidFine(
    address reserveAsset,
    DataTypes.ReserveData storage reserveData,
    address nftAsset,
    DataTypes.NftData storage nftData,
    DataTypes.LoanData memory loanData,
    address poolLoan,
    address reserveOracle
  ) internal view returns (uint256, uint256) {
    nftAsset;
    if (loanData.bidPrice == 0) {
      return (0, 0);
    }
    CalcLoanBidFineLocalVars memory vars;
    vars.reserveDecimals = reserveData.configuration.getDecimals();
    vars.reservePriceInETH = IReserveOracleGetter(reserveOracle).getAssetPrice(reserveAsset);
    vars.baseBidFineInReserve = (1 ether * 10**vars.reserveDecimals) / vars.reservePriceInETH;
    vars.minBidFinePct = nftData.configuration.getMinBidFine();
    vars.minBidFineInReserve = vars.baseBidFineInReserve.percentMul(vars.minBidFinePct);
    (, vars.debtAmount) = ILendPoolLoan(poolLoan).getLoanReserveBorrowAmount(loanData.loanId);
    vars.bidFineInReserve = vars.debtAmount.percentMul(nftData.configuration.getRedeemFine());
    if (vars.bidFineInReserve < vars.minBidFineInReserve) {
      vars.bidFineInReserve = vars.minBidFineInReserve;
    }
    return (vars.minBidFineInReserve, vars.bidFineInReserve);
  }
  function calculateLoanAuctionEndTimestamp(
    DataTypes.NftData storage nftData,
    DataTypes.LoanData memory loanData,
    uint256 pauseStartTime,
    uint256 pauseDurationTime
  ) internal view returns (uint256 auctionEndTimestamp, uint256 redeemEndTimestamp) {
    uint256 extraDuration = 0;
    if ((pauseDurationTime > 0) && (loanData.bidStartTimestamp <= pauseStartTime)) {
      extraDuration = pauseDurationTime;
    }
    auctionEndTimestamp =
      loanData.bidStartTimestamp +
      extraDuration +
      (nftData.configuration.getAuctionDuration() * 1 hours);
    redeemEndTimestamp =
      loanData.bidStartTimestamp +
      extraDuration +
      (nftData.configuration.getRedeemDuration() * 1 hours);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {ReserveLogic} from "./ReserveLogic.sol";
import {GenericLogic} from "./GenericLogic.sol";
import {WadRayMath} from "../math/WadRayMath.sol";
import {PercentageMath} from "../math/PercentageMath.sol";
import {ReserveConfiguration} from "../configuration/ReserveConfiguration.sol";
import {NftConfiguration} from "../configuration/NftConfiguration.sol";
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
import {IInterestRate} from "../../interfaces/IInterestRate.sol";
import {ILendPoolLoan} from "../../interfaces/ILendPoolLoan.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
/**
 * @title ValidationLogic library
 * @author Bend
 * @notice Implements functions to validate the different actions of the protocol
 */
library ValidationLogic {
  using ReserveLogic for DataTypes.ReserveData;
  using WadRayMath for uint256;
  using PercentageMath for uint256;
  using SafeERC20Upgradeable for IERC20Upgradeable;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  using NftConfiguration for DataTypes.NftConfigurationMap;
  /**
   * @dev Validates a deposit action
   * @param reserve The reserve object on which the user is depositing
   * @param amount The amount to be deposited
   */
  function validateDeposit(DataTypes.ReserveData storage reserve, uint256 amount) external view {
    (bool isActive, bool isFrozen, , ) = reserve.configuration.getFlags();
    require(amount != 0, Errors.VL_INVALID_AMOUNT);
    require(isActive, Errors.VL_NO_ACTIVE_RESERVE);
    require(!isFrozen, Errors.VL_RESERVE_FROZEN);
  }
  /**
   * @dev Validates a withdraw action
   * @param reserveData The reserve state
   * @param amount The amount to be withdrawn
   * @param userBalance The balance of the user
   */
  function validateWithdraw(
    DataTypes.ReserveData storage reserveData,
    uint256 amount,
    uint256 userBalance
  ) external view {
    require(amount != 0, Errors.VL_INVALID_AMOUNT);
    require(amount <= userBalance, Errors.VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE);
    (bool isActive, , , ) = reserveData.configuration.getFlags();
    require(isActive, Errors.VL_NO_ACTIVE_RESERVE);
  }
  struct ValidateBorrowLocalVars {
    uint256 currentLtv;
    uint256 currentLiquidationThreshold;
    uint256 amountOfCollateralNeeded;
    uint256 userCollateralBalance;
    uint256 userBorrowBalance;
    uint256 availableLiquidity;
    uint256 healthFactor;
    bool isActive;
    bool isFrozen;
    bool borrowingEnabled;
    bool stableRateBorrowingEnabled;
    bool nftIsActive;
    bool nftIsFrozen;
    address loanReserveAsset;
    address loanBorrower;
  }
  /**
   * @dev Validates a borrow action
   * @param reserveAsset The address of the asset to borrow
   * @param amount The amount to be borrowed
   * @param reserveData The reserve state from which the user is borrowing
   * @param nftData The state of the user for the specific nft
   */
  function validateBorrow(
    address user,
    address reserveAsset,
    uint256 amount,
    DataTypes.ReserveData storage reserveData,
    address nftAsset,
    DataTypes.NftData storage nftData,
    address loanAddress,
    uint256 loanId,
    address reserveOracle,
    address nftOracle
  ) external view {
    ValidateBorrowLocalVars memory vars;
    require(reserveData.bTokenAddress != address(0), Errors.VL_INVALID_RESERVE_ADDRESS);
    require(nftData.bNftAddress != address(0), Errors.LPC_INVALIED_BNFT_ADDRESS);
    require(amount > 0, Errors.VL_INVALID_AMOUNT);
    if (loanId != 0) {
      DataTypes.LoanData memory loanData = ILendPoolLoan(loanAddress).getLoan(loanId);
      require(loanData.state == DataTypes.LoanState.Active, Errors.LPL_INVALID_LOAN_STATE);
      require(reserveAsset == loanData.reserveAsset, Errors.VL_SPECIFIED_RESERVE_NOT_BORROWED_BY_USER);
      require(user == loanData.borrower, Errors.VL_SPECIFIED_LOAN_NOT_BORROWED_BY_USER);
    }
    (vars.isActive, vars.isFrozen, vars.borrowingEnabled, vars.stableRateBorrowingEnabled) = reserveData
      .configuration
      .getFlags();
    require(vars.isActive, Errors.VL_NO_ACTIVE_RESERVE);
    require(!vars.isFrozen, Errors.VL_RESERVE_FROZEN);
    require(vars.borrowingEnabled, Errors.VL_BORROWING_NOT_ENABLED);
    (vars.nftIsActive, vars.nftIsFrozen) = nftData.configuration.getFlags();
    require(vars.nftIsActive, Errors.VL_NO_ACTIVE_NFT);
    require(!vars.nftIsFrozen, Errors.VL_NFT_FROZEN);
    (vars.currentLtv, vars.currentLiquidationThreshold, ) = nftData.configuration.getCollateralParams();
    (vars.userCollateralBalance, vars.userBorrowBalance, vars.healthFactor) = GenericLogic.calculateLoanData(
      reserveAsset,
      reserveData,
      nftAsset,
      nftData,
      loanAddress,
      loanId,
      reserveOracle,
      nftOracle
    );
    require(vars.userCollateralBalance > 0, Errors.VL_COLLATERAL_BALANCE_IS_0);
    require(
      vars.healthFactor > GenericLogic.HEALTH_FACTOR_LIQUIDATION_THRESHOLD,
      Errors.VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD
    );
    //add the current already borrowed amount to the amount requested to calculate the total collateral needed.
    //LTV is calculated in percentage
    vars.amountOfCollateralNeeded = (vars.userBorrowBalance + amount).percentDiv(vars.currentLtv);
    require(vars.amountOfCollateralNeeded <= vars.userCollateralBalance, Errors.VL_COLLATERAL_CANNOT_COVER_NEW_BORROW);
  }
  /**
   * @dev Validates a repay action
   * @param reserveData The reserve state from which the user is repaying
   * @param amountSent The amount sent for the repayment. Can be an actual value or uint(-1)
   * @param borrowAmount The borrow balance of the user
   */
  function validateRepay(
    DataTypes.ReserveData storage reserveData,
    DataTypes.NftData storage nftData,
    DataTypes.LoanData memory loanData,
    uint256 amountSent,
    uint256 borrowAmount
  ) external view {
    require(nftData.bNftAddress != address(0), Errors.LPC_INVALIED_BNFT_ADDRESS);
    require(reserveData.bTokenAddress != address(0), Errors.VL_INVALID_RESERVE_ADDRESS);
    require(reserveData.configuration.getActive(), Errors.VL_NO_ACTIVE_RESERVE);
    require(nftData.configuration.getActive(), Errors.VL_NO_ACTIVE_NFT);
    require(amountSent > 0, Errors.VL_INVALID_AMOUNT);
    require(borrowAmount > 0, Errors.VL_NO_DEBT_OF_SELECTED_TYPE);
    require(loanData.state == DataTypes.LoanState.Active, Errors.LPL_INVALID_LOAN_STATE);
  }
  /**
   * @dev Validates the auction action
   * @param reserveData The reserve data of the principal
   * @param nftData The nft data of the underlying nft
   * @param bidPrice Total variable debt balance of the user
   **/
  function validateAuction(
    DataTypes.ReserveData storage reserveData,
    DataTypes.NftData storage nftData,
    DataTypes.LoanData memory loanData,
    uint256 bidPrice
  ) internal view {
    require(nftData.bNftAddress != address(0), Errors.LPC_INVALIED_BNFT_ADDRESS);
    require(reserveData.bTokenAddress != address(0), Errors.VL_INVALID_RESERVE_ADDRESS);
    require(reserveData.configuration.getActive(), Errors.VL_NO_ACTIVE_RESERVE);
    require(nftData.configuration.getActive(), Errors.VL_NO_ACTIVE_NFT);
    require(
      loanData.state == DataTypes.LoanState.Active || loanData.state == DataTypes.LoanState.Auction,
      Errors.LPL_INVALID_LOAN_STATE
    );
    require(bidPrice > 0, Errors.VL_INVALID_AMOUNT);
  }
  /**
   * @dev Validates a redeem action
   * @param reserveData The reserve state
   * @param nftData The nft state
   */
  function validateRedeem(
    DataTypes.ReserveData storage reserveData,
    DataTypes.NftData storage nftData,
    DataTypes.LoanData memory loanData,
    uint256 amount
  ) external view {
    require(nftData.bNftAddress != address(0), Errors.LPC_INVALIED_BNFT_ADDRESS);
    require(reserveData.bTokenAddress != address(0), Errors.VL_INVALID_RESERVE_ADDRESS);
    require(reserveData.configuration.getActive(), Errors.VL_NO_ACTIVE_RESERVE);
    require(nftData.configuration.getActive(), Errors.VL_NO_ACTIVE_NFT);
    require(loanData.state == DataTypes.LoanState.Auction, Errors.LPL_INVALID_LOAN_STATE);
    require(loanData.bidderAddress != address(0), Errors.LPL_INVALID_BIDDER_ADDRESS);
    require(amount > 0, Errors.VL_INVALID_AMOUNT);
  }
  /**
   * @dev Validates the liquidation action
   * @param reserveData The reserve data of the principal
   * @param nftData The data of the underlying NFT
   * @param loanData The loan data of the underlying NFT
   **/
  function validateLiquidate(
    DataTypes.ReserveData storage reserveData,
    DataTypes.NftData storage nftData,
    DataTypes.LoanData memory loanData
  ) internal view {
    require(nftData.bNftAddress != address(0), Errors.LPC_INVALIED_BNFT_ADDRESS);
    require(reserveData.bTokenAddress != address(0), Errors.VL_INVALID_RESERVE_ADDRESS);
    require(reserveData.configuration.getActive(), Errors.VL_NO_ACTIVE_RESERVE);
    require(nftData.configuration.getActive(), Errors.VL_NO_ACTIVE_NFT);
    require(loanData.state == DataTypes.LoanState.Auction, Errors.LPL_INVALID_LOAN_STATE);
    require(loanData.bidderAddress != address(0), Errors.LPL_INVALID_BIDDER_ADDRESS);
  }
  /**
   * @dev Validates an bToken transfer
   * @param from The user from which the bTokens are being transferred
   * @param reserveData The state of the reserve
   */
  function validateTransfer(address from, DataTypes.ReserveData storage reserveData) internal pure {
    from;
    reserveData;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
/**
 * @title ReserveConfiguration library
 * @author Bend
 * @notice Implements the bitmap logic to handle the reserve configuration
 */
library ReserveConfiguration {
  uint256 constant LTV_MASK =                   0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000; // prettier-ignore
  uint256 constant LIQUIDATION_THRESHOLD_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFF; // prettier-ignore
  uint256 constant LIQUIDATION_BONUS_MASK =     0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFF; // prettier-ignore
  uint256 constant DECIMALS_MASK =              0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00FFFFFFFFFFFF; // prettier-ignore
  uint256 constant ACTIVE_MASK =                0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant FROZEN_MASK =                0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFDFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant BORROWING_MASK =             0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFBFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant STABLE_BORROWING_MASK =      0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7FFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant RESERVE_FACTOR_MASK =        0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFFFFFFFFFF; // prettier-ignore
  /// @dev For the LTV, the start bit is 0 (up to 15), hence no bitshifting is needed
  uint256 constant LIQUIDATION_THRESHOLD_START_BIT_POSITION = 16;
  uint256 constant LIQUIDATION_BONUS_START_BIT_POSITION = 32;
  uint256 constant RESERVE_DECIMALS_START_BIT_POSITION = 48;
  uint256 constant IS_ACTIVE_START_BIT_POSITION = 56;
  uint256 constant IS_FROZEN_START_BIT_POSITION = 57;
  uint256 constant BORROWING_ENABLED_START_BIT_POSITION = 58;
  uint256 constant STABLE_BORROWING_ENABLED_START_BIT_POSITION = 59;
  uint256 constant RESERVE_FACTOR_START_BIT_POSITION = 64;
  uint256 constant MAX_VALID_LTV = 65535;
  uint256 constant MAX_VALID_LIQUIDATION_THRESHOLD = 65535;
  uint256 constant MAX_VALID_LIQUIDATION_BONUS = 65535;
  uint256 constant MAX_VALID_DECIMALS = 255;
  uint256 constant MAX_VALID_RESERVE_FACTOR = 65535;
  /**
   * @dev Sets the Loan to Value of the reserve
   * @param self The reserve configuration
   * @param ltv the new ltv
   **/
  function setLtv(DataTypes.ReserveConfigurationMap memory self, uint256 ltv) internal pure {
    require(ltv <= MAX_VALID_LTV, Errors.RC_INVALID_LTV);
    self.data = (self.data & LTV_MASK) | ltv;
  }
  /**
   * @dev Gets the Loan to Value of the reserve
   * @param self The reserve configuration
   * @return The loan to value
   **/
  function getLtv(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) {
    return self.data & ~LTV_MASK;
  }
  /**
   * @dev Sets the liquidation threshold of the reserve
   * @param self The reserve configuration
   * @param threshold The new liquidation threshold
   **/
  function setLiquidationThreshold(DataTypes.ReserveConfigurationMap memory self, uint256 threshold) internal pure {
    require(threshold <= MAX_VALID_LIQUIDATION_THRESHOLD, Errors.RC_INVALID_LIQ_THRESHOLD);
    self.data = (self.data & LIQUIDATION_THRESHOLD_MASK) | (threshold << LIQUIDATION_THRESHOLD_START_BIT_POSITION);
  }
  /**
   * @dev Gets the liquidation threshold of the reserve
   * @param self The reserve configuration
   * @return The liquidation threshold
   **/
  function getLiquidationThreshold(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION;
  }
  /**
   * @dev Sets the liquidation bonus of the reserve
   * @param self The reserve configuration
   * @param bonus The new liquidation bonus
   **/
  function setLiquidationBonus(DataTypes.ReserveConfigurationMap memory self, uint256 bonus) internal pure {
    require(bonus <= MAX_VALID_LIQUIDATION_BONUS, Errors.RC_INVALID_LIQ_BONUS);
    self.data = (self.data & LIQUIDATION_BONUS_MASK) | (bonus << LIQUIDATION_BONUS_START_BIT_POSITION);
  }
  /**
   * @dev Gets the liquidation bonus of the reserve
   * @param self The reserve configuration
   * @return The liquidation bonus
   **/
  function getLiquidationBonus(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION;
  }
  /**
   * @dev Sets the decimals of the underlying asset of the reserve
   * @param self The reserve configuration
   * @param decimals The decimals
   **/
  function setDecimals(DataTypes.ReserveConfigurationMap memory self, uint256 decimals) internal pure {
    require(decimals <= MAX_VALID_DECIMALS, Errors.RC_INVALID_DECIMALS);
    self.data = (self.data & DECIMALS_MASK) | (decimals << RESERVE_DECIMALS_START_BIT_POSITION);
  }
  /**
   * @dev Gets the decimals of the underlying asset of the reserve
   * @param self The reserve configuration
   * @return The decimals of the asset
   **/
  function getDecimals(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION;
  }
  /**
   * @dev Sets the active state of the reserve
   * @param self The reserve configuration
   * @param active The active state
   **/
  function setActive(DataTypes.ReserveConfigurationMap memory self, bool active) internal pure {
    self.data = (self.data & ACTIVE_MASK) | (uint256(active ? 1 : 0) << IS_ACTIVE_START_BIT_POSITION);
  }
  /**
   * @dev Gets the active state of the reserve
   * @param self The reserve configuration
   * @return The active state
   **/
  function getActive(DataTypes.ReserveConfigurationMap storage self) internal view returns (bool) {
    return (self.data & ~ACTIVE_MASK) != 0;
  }
  /**
   * @dev Sets the frozen state of the reserve
   * @param self The reserve configuration
   * @param frozen The frozen state
   **/
  function setFrozen(DataTypes.ReserveConfigurationMap memory self, bool frozen) internal pure {
    self.data = (self.data & FROZEN_MASK) | (uint256(frozen ? 1 : 0) << IS_FROZEN_START_BIT_POSITION);
  }
  /**
   * @dev Gets the frozen state of the reserve
   * @param self The reserve configuration
   * @return The frozen state
   **/
  function getFrozen(DataTypes.ReserveConfigurationMap storage self) internal view returns (bool) {
    return (self.data & ~FROZEN_MASK) != 0;
  }
  /**
   * @dev Enables or disables borrowing on the reserve
   * @param self The reserve configuration
   * @param enabled True if the borrowing needs to be enabled, false otherwise
   **/
  function setBorrowingEnabled(DataTypes.ReserveConfigurationMap memory self, bool enabled) internal pure {
    self.data = (self.data & BORROWING_MASK) | (uint256(enabled ? 1 : 0) << BORROWING_ENABLED_START_BIT_POSITION);
  }
  /**
   * @dev Gets the borrowing state of the reserve
   * @param self The reserve configuration
   * @return The borrowing state
   **/
  function getBorrowingEnabled(DataTypes.ReserveConfigurationMap storage self) internal view returns (bool) {
    return (self.data & ~BORROWING_MASK) != 0;
  }
  /**
   * @dev Enables or disables stable rate borrowing on the reserve
   * @param self The reserve configuration
   * @param enabled True if the stable rate borrowing needs to be enabled, false otherwise
   **/
  function setStableRateBorrowingEnabled(DataTypes.ReserveConfigurationMap memory self, bool enabled) internal pure {
    self.data =
      (self.data & STABLE_BORROWING_MASK) |
      (uint256(enabled ? 1 : 0) << STABLE_BORROWING_ENABLED_START_BIT_POSITION);
  }
  /**
   * @dev Gets the stable rate borrowing state of the reserve
   * @param self The reserve configuration
   * @return The stable rate borrowing state
   **/
  function getStableRateBorrowingEnabled(DataTypes.ReserveConfigurationMap storage self) internal view returns (bool) {
    return (self.data & ~STABLE_BORROWING_MASK) != 0;
  }
  /**
   * @dev Sets the reserve factor of the reserve
   * @param self The reserve configuration
   * @param reserveFactor The reserve factor
   **/
  function setReserveFactor(DataTypes.ReserveConfigurationMap memory self, uint256 reserveFactor) internal pure {
    require(reserveFactor <= MAX_VALID_RESERVE_FACTOR, Errors.RC_INVALID_RESERVE_FACTOR);
    self.data = (self.data & RESERVE_FACTOR_MASK) | (reserveFactor << RESERVE_FACTOR_START_BIT_POSITION);
  }
  /**
   * @dev Gets the reserve factor of the reserve
   * @param self The reserve configuration
   * @return The reserve factor
   **/
  function getReserveFactor(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~RESERVE_FACTOR_MASK) >> RESERVE_FACTOR_START_BIT_POSITION;
  }
  /**
   * @dev Gets the configuration flags of the reserve
   * @param self The reserve configuration
   * @return The state flags representing active, frozen, borrowing enabled, stableRateBorrowing enabled
   **/
  function getFlags(DataTypes.ReserveConfigurationMap storage self)
    internal
    view
    returns (
      bool,
      bool,
      bool,
      bool
    )
  {
    uint256 dataLocal = self.data;
    return (
      (dataLocal & ~ACTIVE_MASK) != 0,
      (dataLocal & ~FROZEN_MASK) != 0,
      (dataLocal & ~BORROWING_MASK) != 0,
      (dataLocal & ~STABLE_BORROWING_MASK) != 0
    );
  }
  /**
   * @dev Gets the configuration paramters of the reserve
   * @param self The reserve configuration
   * @return The state params representing ltv, liquidation threshold, liquidation bonus, the reserve decimals
   **/
  function getParams(DataTypes.ReserveConfigurationMap storage self)
    internal
    view
    returns (
      uint256,
      uint256,
      uint256,
      uint256,
      uint256
    )
  {
    uint256 dataLocal = self.data;
    return (
      dataLocal & ~LTV_MASK,
      (dataLocal & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION,
      (dataLocal & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION,
      (dataLocal & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION,
      (dataLocal & ~RESERVE_FACTOR_MASK) >> RESERVE_FACTOR_START_BIT_POSITION
    );
  }
  /**
   * @dev Gets the configuration paramters of the reserve from a memory object
   * @param self The reserve configuration
   * @return The state params representing ltv, liquidation threshold, liquidation bonus, the reserve decimals
   **/
  function getParamsMemory(DataTypes.ReserveConfigurationMap memory self)
    internal
    pure
    returns (
      uint256,
      uint256,
      uint256,
      uint256,
      uint256
    )
  {
    return (
      self.data & ~LTV_MASK,
      (self.data & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION,
      (self.data & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION,
      (self.data & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION,
      (self.data & ~RESERVE_FACTOR_MASK) >> RESERVE_FACTOR_START_BIT_POSITION
    );
  }
  /**
   * @dev Gets the configuration flags of the reserve from a memory object
   * @param self The reserve configuration
   * @return The state flags representing active, frozen, borrowing enabled, stableRateBorrowing enabled
   **/
  function getFlagsMemory(DataTypes.ReserveConfigurationMap memory self)
    internal
    pure
    returns (
      bool,
      bool,
      bool,
      bool
    )
  {
    return (
      (self.data & ~ACTIVE_MASK) != 0,
      (self.data & ~FROZEN_MASK) != 0,
      (self.data & ~BORROWING_MASK) != 0,
      (self.data & ~STABLE_BORROWING_MASK) != 0
    );
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {Errors} from "../helpers/Errors.sol";
import {DataTypes} from "../types/DataTypes.sol";
/**
 * @title NftConfiguration library
 * @author Bend
 * @notice Implements the bitmap logic to handle the NFT configuration
 */
library NftConfiguration {
  uint256 constant LTV_MASK =                   0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000; // prettier-ignore
  uint256 constant LIQUIDATION_THRESHOLD_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFF; // prettier-ignore
  uint256 constant LIQUIDATION_BONUS_MASK =     0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFF; // prettier-ignore
  uint256 constant ACTIVE_MASK =                0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant FROZEN_MASK =                0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFDFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant REDEEM_DURATION_MASK =       0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00FFFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant AUCTION_DURATION_MASK =      0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00FFFFFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant REDEEM_FINE_MASK =           0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant REDEEM_THRESHOLD_MASK =      0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFFFFFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant MIN_BIDFINE_MASK      =      0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFFFFFFFFFFFFFFFFFFFFFF; // prettier-ignore
  /// @dev For the LTV, the start bit is 0 (up to 15), hence no bitshifting is needed
  uint256 constant LIQUIDATION_THRESHOLD_START_BIT_POSITION = 16;
  uint256 constant LIQUIDATION_BONUS_START_BIT_POSITION = 32;
  uint256 constant IS_ACTIVE_START_BIT_POSITION = 56;
  uint256 constant IS_FROZEN_START_BIT_POSITION = 57;
  uint256 constant REDEEM_DURATION_START_BIT_POSITION = 64;
  uint256 constant AUCTION_DURATION_START_BIT_POSITION = 72;
  uint256 constant REDEEM_FINE_START_BIT_POSITION = 80;
  uint256 constant REDEEM_THRESHOLD_START_BIT_POSITION = 96;
  uint256 constant MIN_BIDFINE_START_BIT_POSITION = 112;
  uint256 constant MAX_VALID_LTV = 65535;
  uint256 constant MAX_VALID_LIQUIDATION_THRESHOLD = 65535;
  uint256 constant MAX_VALID_LIQUIDATION_BONUS = 65535;
  uint256 constant MAX_VALID_REDEEM_DURATION = 255;
  uint256 constant MAX_VALID_AUCTION_DURATION = 255;
  uint256 constant MAX_VALID_REDEEM_FINE = 65535;
  uint256 constant MAX_VALID_REDEEM_THRESHOLD = 65535;
  uint256 constant MAX_VALID_MIN_BIDFINE = 65535;
  /**
   * @dev Sets the Loan to Value of the NFT
   * @param self The NFT configuration
   * @param ltv the new ltv
   **/
  function setLtv(DataTypes.NftConfigurationMap memory self, uint256 ltv) internal pure {
    require(ltv <= MAX_VALID_LTV, Errors.RC_INVALID_LTV);
    self.data = (self.data & LTV_MASK) | ltv;
  }
  /**
   * @dev Gets the Loan to Value of the NFT
   * @param self The NFT configuration
   * @return The loan to value
   **/
  function getLtv(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return self.data & ~LTV_MASK;
  }
  /**
   * @dev Sets the liquidation threshold of the NFT
   * @param self The NFT configuration
   * @param threshold The new liquidation threshold
   **/
  function setLiquidationThreshold(DataTypes.NftConfigurationMap memory self, uint256 threshold) internal pure {
    require(threshold <= MAX_VALID_LIQUIDATION_THRESHOLD, Errors.RC_INVALID_LIQ_THRESHOLD);
    self.data = (self.data & LIQUIDATION_THRESHOLD_MASK) | (threshold << LIQUIDATION_THRESHOLD_START_BIT_POSITION);
  }
  /**
   * @dev Gets the liquidation threshold of the NFT
   * @param self The NFT configuration
   * @return The liquidation threshold
   **/
  function getLiquidationThreshold(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION;
  }
  /**
   * @dev Sets the liquidation bonus of the NFT
   * @param self The NFT configuration
   * @param bonus The new liquidation bonus
   **/
  function setLiquidationBonus(DataTypes.NftConfigurationMap memory self, uint256 bonus) internal pure {
    require(bonus <= MAX_VALID_LIQUIDATION_BONUS, Errors.RC_INVALID_LIQ_BONUS);
    self.data = (self.data & LIQUIDATION_BONUS_MASK) | (bonus << LIQUIDATION_BONUS_START_BIT_POSITION);
  }
  /**
   * @dev Gets the liquidation bonus of the NFT
   * @param self The NFT configuration
   * @return The liquidation bonus
   **/
  function getLiquidationBonus(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION;
  }
  /**
   * @dev Sets the active state of the NFT
   * @param self The NFT configuration
   * @param active The active state
   **/
  function setActive(DataTypes.NftConfigurationMap memory self, bool active) internal pure {
    self.data = (self.data & ACTIVE_MASK) | (uint256(active ? 1 : 0) << IS_ACTIVE_START_BIT_POSITION);
  }
  /**
   * @dev Gets the active state of the NFT
   * @param self The NFT configuration
   * @return The active state
   **/
  function getActive(DataTypes.NftConfigurationMap storage self) internal view returns (bool) {
    return (self.data & ~ACTIVE_MASK) != 0;
  }
  /**
   * @dev Sets the frozen state of the NFT
   * @param self The NFT configuration
   * @param frozen The frozen state
   **/
  function setFrozen(DataTypes.NftConfigurationMap memory self, bool frozen) internal pure {
    self.data = (self.data & FROZEN_MASK) | (uint256(frozen ? 1 : 0) << IS_FROZEN_START_BIT_POSITION);
  }
  /**
   * @dev Gets the frozen state of the NFT
   * @param self The NFT configuration
   * @return The frozen state
   **/
  function getFrozen(DataTypes.NftConfigurationMap storage self) internal view returns (bool) {
    return (self.data & ~FROZEN_MASK) != 0;
  }
  /**
   * @dev Sets the redeem duration of the NFT
   * @param self The NFT configuration
   * @param redeemDuration The redeem duration
   **/
  function setRedeemDuration(DataTypes.NftConfigurationMap memory self, uint256 redeemDuration) internal pure {
    require(redeemDuration <= MAX_VALID_REDEEM_DURATION, Errors.RC_INVALID_REDEEM_DURATION);
    self.data = (self.data & REDEEM_DURATION_MASK) | (redeemDuration << REDEEM_DURATION_START_BIT_POSITION);
  }
  /**
   * @dev Gets the redeem duration of the NFT
   * @param self The NFT configuration
   * @return The redeem duration
   **/
  function getRedeemDuration(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~REDEEM_DURATION_MASK) >> REDEEM_DURATION_START_BIT_POSITION;
  }
  /**
   * @dev Sets the auction duration of the NFT
   * @param self The NFT configuration
   * @param auctionDuration The auction duration
   **/
  function setAuctionDuration(DataTypes.NftConfigurationMap memory self, uint256 auctionDuration) internal pure {
    require(auctionDuration <= MAX_VALID_AUCTION_DURATION, Errors.RC_INVALID_AUCTION_DURATION);
    self.data = (self.data & AUCTION_DURATION_MASK) | (auctionDuration << AUCTION_DURATION_START_BIT_POSITION);
  }
  /**
   * @dev Gets the auction duration of the NFT
   * @param self The NFT configuration
   * @return The auction duration
   **/
  function getAuctionDuration(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~AUCTION_DURATION_MASK) >> AUCTION_DURATION_START_BIT_POSITION;
  }
  /**
   * @dev Sets the redeem fine of the NFT
   * @param self The NFT configuration
   * @param redeemFine The redeem duration
   **/
  function setRedeemFine(DataTypes.NftConfigurationMap memory self, uint256 redeemFine) internal pure {
    require(redeemFine <= MAX_VALID_REDEEM_FINE, Errors.RC_INVALID_REDEEM_FINE);
    self.data = (self.data & REDEEM_FINE_MASK) | (redeemFine << REDEEM_FINE_START_BIT_POSITION);
  }
  /**
   * @dev Gets the redeem fine of the NFT
   * @param self The NFT configuration
   * @return The redeem fine
   **/
  function getRedeemFine(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~REDEEM_FINE_MASK) >> REDEEM_FINE_START_BIT_POSITION;
  }
  /**
   * @dev Sets the redeem threshold of the NFT
   * @param self The NFT configuration
   * @param redeemThreshold The redeem duration
   **/
  function setRedeemThreshold(DataTypes.NftConfigurationMap memory self, uint256 redeemThreshold) internal pure {
    require(redeemThreshold <= MAX_VALID_REDEEM_THRESHOLD, Errors.RC_INVALID_REDEEM_THRESHOLD);
    self.data = (self.data & REDEEM_THRESHOLD_MASK) | (redeemThreshold << REDEEM_THRESHOLD_START_BIT_POSITION);
  }
  /**
   * @dev Gets the redeem threshold of the NFT
   * @param self The NFT configuration
   * @return The redeem threshold
   **/
  function getRedeemThreshold(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return (self.data & ~REDEEM_THRESHOLD_MASK) >> REDEEM_THRESHOLD_START_BIT_POSITION;
  }
  /**
   * @dev Sets the min & max threshold of the NFT
   * @param self The NFT configuration
   * @param minBidFine The min bid fine
   **/
  function setMinBidFine(DataTypes.NftConfigurationMap memory self, uint256 minBidFine) internal pure {
    require(minBidFine <= MAX_VALID_MIN_BIDFINE, Errors.RC_INVALID_MIN_BID_FINE);
    self.data = (self.data & MIN_BIDFINE_MASK) | (minBidFine << MIN_BIDFINE_START_BIT_POSITION);
  }
  /**
   * @dev Gets the min bid fine of the NFT
   * @param self The NFT configuration
   * @return The min bid fine
   **/
  function getMinBidFine(DataTypes.NftConfigurationMap storage self) internal view returns (uint256) {
    return ((self.data & ~MIN_BIDFINE_MASK) >> MIN_BIDFINE_START_BIT_POSITION);
  }
  /**
   * @dev Gets the configuration flags of the NFT
   * @param self The NFT configuration
   * @return The state flags representing active, frozen
   **/
  function getFlags(DataTypes.NftConfigurationMap storage self) internal view returns (bool, bool) {
    uint256 dataLocal = self.data;
    return ((dataLocal & ~ACTIVE_MASK) != 0, (dataLocal & ~FROZEN_MASK) != 0);
  }
  /**
   * @dev Gets the configuration flags of the NFT from a memory object
   * @param self The NFT configuration
   * @return The state flags representing active, frozen
   **/
  function getFlagsMemory(DataTypes.NftConfigurationMap memory self) internal pure returns (bool, bool) {
    return ((self.data & ~ACTIVE_MASK) != 0, (self.data & ~FROZEN_MASK) != 0);
  }
  /**
   * @dev Gets the collateral configuration paramters of the NFT
   * @param self The NFT configuration
   * @return The state params representing ltv, liquidation threshold, liquidation bonus
   **/
  function getCollateralParams(DataTypes.NftConfigurationMap storage self)
    internal
    view
    returns (
      uint256,
      uint256,
      uint256
    )
  {
    uint256 dataLocal = self.data;
    return (
      dataLocal & ~LTV_MASK,
      (dataLocal & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION,
      (dataLocal & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION
    );
  }
  /**
   * @dev Gets the auction configuration paramters of the NFT
   * @param self The NFT configuration
   * @return The state params representing redeem duration, auction duration, redeem fine
   **/
  function getAuctionParams(DataTypes.NftConfigurationMap storage self)
    internal
    view
    returns (
      uint256,
      uint256,
      uint256,
      uint256
    )
  {
    uint256 dataLocal = self.data;
    return (
      (dataLocal & ~REDEEM_DURATION_MASK) >> REDEEM_DURATION_START_BIT_POSITION,
      (dataLocal & ~AUCTION_DURATION_MASK) >> AUCTION_DURATION_START_BIT_POSITION,
      (dataLocal & ~REDEEM_FINE_MASK) >> REDEEM_FINE_START_BIT_POSITION,
      (dataLocal & ~REDEEM_THRESHOLD_MASK) >> REDEEM_THRESHOLD_START_BIT_POSITION
    );
  }
  /**
   * @dev Gets the collateral configuration paramters of the NFT from a memory object
   * @param self The NFT configuration
   * @return The state params representing ltv, liquidation threshold, liquidation bonus
   **/
  function getCollateralParamsMemory(DataTypes.NftConfigurationMap memory self)
    internal
    pure
    returns (
      uint256,
      uint256,
      uint256
    )
  {
    return (
      self.data & ~LTV_MASK,
      (self.data & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION,
      (self.data & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION
    );
  }
  /**
   * @dev Gets the auction configuration paramters of the NFT from a memory object
   * @param self The NFT configuration
   * @return The state params representing redeem duration, auction duration, redeem fine
   **/
  function getAuctionParamsMemory(DataTypes.NftConfigurationMap memory self)
    internal
    pure
    returns (
      uint256,
      uint256,
      uint256,
      uint256
    )
  {
    return (
      (self.data & ~REDEEM_DURATION_MASK) >> REDEEM_DURATION_START_BIT_POSITION,
      (self.data & ~AUCTION_DURATION_MASK) >> AUCTION_DURATION_START_BIT_POSITION,
      (self.data & ~REDEEM_FINE_MASK) >> REDEEM_FINE_START_BIT_POSITION,
      (self.data & ~REDEEM_THRESHOLD_MASK) >> REDEEM_THRESHOLD_START_BIT_POSITION
    );
  }
  /**
   * @dev Gets the min & max bid fine of the NFT
   * @param self The NFT configuration
   * @return The min & max bid fine
   **/
  function getMinBidFineMemory(DataTypes.NftConfigurationMap memory self) internal pure returns (uint256) {
    return ((self.data & ~MIN_BIDFINE_MASK) >> MIN_BIDFINE_START_BIT_POSITION);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {WadRayMath} from "./WadRayMath.sol";
library MathUtils {
  using WadRayMath for uint256;
  /// @dev Ignoring leap years
  uint256 internal constant SECONDS_PER_YEAR = 365 days;
  /**
   * @dev Function to calculate the interest accumulated using a linear interest rate formula
   * @param rate The interest rate, in ray
   * @param lastUpdateTimestamp The timestamp of the last update of the interest
   * @return The interest rate linearly accumulated during the timeDelta, in ray
   **/
  function calculateLinearInterest(uint256 rate, uint40 lastUpdateTimestamp) internal view returns (uint256) {
    //solium-disable-next-line
    uint256 timeDifference = block.timestamp - (uint256(lastUpdateTimestamp));
    return ((rate * (timeDifference)) / SECONDS_PER_YEAR) + (WadRayMath.ray());
  }
  /**
   * @dev Function to calculate the interest using a compounded interest rate formula
   * To avoid expensive exponentiation, the calculation is performed using a binomial approximation:
   *
   *  (1+x)^n = 1+n*x+[n/2*(n-1)]*x^2+[n/6*(n-1)*(n-2)*x^3...
   *
   * The approximation slightly underpays liquidity providers and undercharges borrowers, with the advantage of great gas cost reductions
   * The whitepaper contains reference to the approximation and a table showing the margin of error per different time periods
   *
   * @param rate The interest rate, in ray
   * @param lastUpdateTimestamp The timestamp of the last update of the interest
   * @return The interest rate compounded during the timeDelta, in ray
   **/
  function calculateCompoundedInterest(
    uint256 rate,
    uint40 lastUpdateTimestamp,
    uint256 currentTimestamp
  ) internal pure returns (uint256) {
    //solium-disable-next-line
    uint256 exp = currentTimestamp - (uint256(lastUpdateTimestamp));
    if (exp == 0) {
      return WadRayMath.ray();
    }
    uint256 expMinusOne = exp - 1;
    uint256 expMinusTwo = exp > 2 ? exp - 2 : 0;
    uint256 ratePerSecond = rate / SECONDS_PER_YEAR;
    uint256 basePowerTwo = ratePerSecond.rayMul(ratePerSecond);
    uint256 basePowerThree = basePowerTwo.rayMul(ratePerSecond);
    uint256 secondTerm = (exp * (expMinusOne) * (basePowerTwo)) / 2;
    uint256 thirdTerm = (exp * (expMinusOne) * (expMinusTwo) * (basePowerThree)) / 6;
    return WadRayMath.ray() + (ratePerSecond * (exp)) + (secondTerm) + (thirdTerm);
  }
  /**
   * @dev Calculates the compounded interest between the timestamp of the last update and the current block timestamp
   * @param rate The interest rate (in ray)
   * @param lastUpdateTimestamp The timestamp from which the interest accumulation needs to be calculated
   **/
  function calculateCompoundedInterest(uint256 rate, uint40 lastUpdateTimestamp) internal view returns (uint256) {
    return calculateCompoundedInterest(rate, lastUpdateTimestamp, block.timestamp);
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {Errors} from "../helpers/Errors.sol";
/**
 * @title WadRayMath library
 * @author Bend
 * @dev Provides mul and div function for wads (decimal numbers with 18 digits precision) and rays (decimals with 27 digits)
 **/
library WadRayMath {
  uint256 internal constant WAD = 1e18;
  uint256 internal constant HALF_WAD = WAD / 2;
  uint256 internal constant RAY = 1e27;
  uint256 internal constant HALF_RAY = RAY / 2;
  uint256 internal constant WAD_RAY_RATIO = 1e9;
  /**
   * @return One ray, 1e27
   **/
  function ray() internal pure returns (uint256) {
    return RAY;
  }
  /**
   * @return One wad, 1e18
   **/
  function wad() internal pure returns (uint256) {
    return WAD;
  }
  /**
   * @return Half ray, 1e27/2
   **/
  function halfRay() internal pure returns (uint256) {
    return HALF_RAY;
  }
  /**
   * @return Half ray, 1e18/2
   **/
  function halfWad() internal pure returns (uint256) {
    return HALF_WAD;
  }
  /**
   * @dev Multiplies two wad, rounding half up to the nearest wad
   * @param a Wad
   * @param b Wad
   * @return The result of a*b, in wad
   **/
  function wadMul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0 || b == 0) {
      return 0;
    }
    require(a <= (type(uint256).max - HALF_WAD) / b, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (a * b + HALF_WAD) / WAD;
  }
  /**
   * @dev Divides two wad, rounding half up to the nearest wad
   * @param a Wad
   * @param b Wad
   * @return The result of a/b, in wad
   **/
  function wadDiv(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0, Errors.MATH_DIVISION_BY_ZERO);
    uint256 halfB = b / 2;
    require(a <= (type(uint256).max - halfB) / WAD, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (a * WAD + halfB) / b;
  }
  /**
   * @dev Multiplies two ray, rounding half up to the nearest ray
   * @param a Ray
   * @param b Ray
   * @return The result of a*b, in ray
   **/
  function rayMul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0 || b == 0) {
      return 0;
    }
    require(a <= (type(uint256).max - HALF_RAY) / b, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (a * b + HALF_RAY) / RAY;
  }
  /**
   * @dev Divides two ray, rounding half up to the nearest ray
   * @param a Ray
   * @param b Ray
   * @return The result of a/b, in ray
   **/
  function rayDiv(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0, Errors.MATH_DIVISION_BY_ZERO);
    uint256 halfB = b / 2;
    require(a <= (type(uint256).max - halfB) / RAY, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (a * RAY + halfB) / b;
  }
  /**
   * @dev Casts ray down to wad
   * @param a Ray
   * @return a casted to wad, rounded half up to the nearest wad
   **/
  function rayToWad(uint256 a) internal pure returns (uint256) {
    uint256 halfRatio = WAD_RAY_RATIO / 2;
    uint256 result = halfRatio + a;
    require(result >= halfRatio, Errors.MATH_ADDITION_OVERFLOW);
    return result / WAD_RAY_RATIO;
  }
  /**
   * @dev Converts wad up to ray
   * @param a Wad
   * @return a converted in ray
   **/
  function wadToRay(uint256 a) internal pure returns (uint256) {
    uint256 result = a * WAD_RAY_RATIO;
    require(result / WAD_RAY_RATIO == a, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return result;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
import {Errors} from "../helpers/Errors.sol";
/**
 * @title PercentageMath library
 * @author Bend
 * @notice Provides functions to perform percentage calculations
 * @dev Percentages are defined by default with 2 decimals of precision (100.00). The precision is indicated by PERCENTAGE_FACTOR
 * @dev Operations are rounded half up
 **/
library PercentageMath {
  uint256 constant PERCENTAGE_FACTOR = 1e4; //percentage plus two decimals
  uint256 constant HALF_PERCENT = PERCENTAGE_FACTOR / 2;
  uint256 constant ONE_PERCENT = 1e2; //100, 1%
  uint256 constant TEN_PERCENT = 1e3; //1000, 10%
  uint256 constant ONE_THOUSANDTH_PERCENT = 1e1; //10, 0.1%
  uint256 constant ONE_TEN_THOUSANDTH_PERCENT = 1; //1, 0.01%
  /**
   * @dev Executes a percentage multiplication
   * @param value The value of which the percentage needs to be calculated
   * @param percentage The percentage of the value to be calculated
   * @return The percentage of value
   **/
  function percentMul(uint256 value, uint256 percentage) internal pure returns (uint256) {
    if (value == 0 || percentage == 0) {
      return 0;
    }
    require(value <= (type(uint256).max - HALF_PERCENT) / percentage, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (value * percentage + HALF_PERCENT) / PERCENTAGE_FACTOR;
  }
  /**
   * @dev Executes a percentage division
   * @param value The value of which the percentage needs to be calculated
   * @param percentage The percentage of the value to be calculated
   * @return The value divided the percentage
   **/
  function percentDiv(uint256 value, uint256 percentage) internal pure returns (uint256) {
    require(percentage != 0, Errors.MATH_DIVISION_BY_ZERO);
    uint256 halfPercentage = percentage / 2;
    require(value <= (type(uint256).max - halfPercentage) / PERCENTAGE_FACTOR, Errors.MATH_MULTIPLICATION_OVERFLOW);
    return (value * PERCENTAGE_FACTOR + halfPercentage) / percentage;
  }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
/**
 * @title Errors library
 * @author Bend
 * @notice Defines the error messages emitted by the different contracts of the Bend protocol
 */
library Errors {
  enum ReturnCode {
    SUCCESS,
    FAILED
  }
  string public constant SUCCESS = "0";
  //common errors
  string public constant CALLER_NOT_POOL_ADMIN = "100"; // 'The caller must be the pool admin'
  string public constant CALLER_NOT_ADDRESS_PROVIDER = "101";
  string public constant INVALID_FROM_BALANCE_AFTER_TRANSFER = "102";
  string public constant INVALID_TO_BALANCE_AFTER_TRANSFER = "103";
  string public constant CALLER_NOT_ONBEHALFOF_OR_IN_WHITELIST = "104";
  //math library erros
  string public constant MATH_MULTIPLICATION_OVERFLOW = "200";
  string public constant MATH_ADDITION_OVERFLOW = "201";
  string public constant MATH_DIVISION_BY_ZERO = "202";
  //validation & check errors
  string public constant VL_INVALID_AMOUNT = "301"; // 'Amount must be greater than 0'
  string public constant VL_NO_ACTIVE_RESERVE = "302"; // 'Action requires an active reserve'
  string public constant VL_RESERVE_FROZEN = "303"; // 'Action cannot be performed because the reserve is frozen'
  string public constant VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE = "304"; // 'User cannot withdraw more than the available balance'
  string public constant VL_BORROWING_NOT_ENABLED = "305"; // 'Borrowing is not enabled'
  string public constant VL_COLLATERAL_BALANCE_IS_0 = "306"; // 'The collateral balance is 0'
  string public constant VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD = "307"; // 'Health factor is lesser than the liquidation threshold'
  string public constant VL_COLLATERAL_CANNOT_COVER_NEW_BORROW = "308"; // 'There is not enough collateral to cover a new borrow'
  string public constant VL_NO_DEBT_OF_SELECTED_TYPE = "309"; // 'for repayment of stable debt, the user needs to have stable debt, otherwise, he needs to have variable debt'
  string public constant VL_NO_ACTIVE_NFT = "310";
  string public constant VL_NFT_FROZEN = "311";
  string public constant VL_SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER = "312"; // 'User did not borrow the specified currency'
  string public constant VL_INVALID_HEALTH_FACTOR = "313";
  string public constant VL_INVALID_ONBEHALFOF_ADDRESS = "314";
  string public constant VL_INVALID_TARGET_ADDRESS = "315";
  string public constant VL_INVALID_RESERVE_ADDRESS = "316";
  string public constant VL_SPECIFIED_LOAN_NOT_BORROWED_BY_USER = "317";
  string public constant VL_SPECIFIED_RESERVE_NOT_BORROWED_BY_USER = "318";
  string public constant VL_HEALTH_FACTOR_HIGHER_THAN_LIQUIDATION_THRESHOLD = "319";
  //lend pool errors
  string public constant LP_CALLER_NOT_LEND_POOL_CONFIGURATOR = "400"; // 'The caller of the function is not the lending pool configurator'
  string public constant LP_IS_PAUSED = "401"; // 'Pool is paused'
  string public constant LP_NO_MORE_RESERVES_ALLOWED = "402";
  string public constant LP_NOT_CONTRACT = "403";
  string public constant LP_BORROW_NOT_EXCEED_LIQUIDATION_THRESHOLD = "404";
  string public constant LP_BORROW_IS_EXCEED_LIQUIDATION_PRICE = "405";
  string public constant LP_NO_MORE_NFTS_ALLOWED = "406";
  string public constant LP_INVALIED_USER_NFT_AMOUNT = "407";
  string public constant LP_INCONSISTENT_PARAMS = "408";
  string public constant LP_NFT_IS_NOT_USED_AS_COLLATERAL = "409";
  string public constant LP_CALLER_MUST_BE_AN_BTOKEN = "410";
  string public constant LP_INVALIED_NFT_AMOUNT = "411";
  string public constant LP_NFT_HAS_USED_AS_COLLATERAL = "412";
  string public constant LP_DELEGATE_CALL_FAILED = "413";
  string public constant LP_AMOUNT_LESS_THAN_EXTRA_DEBT = "414";
  string public constant LP_AMOUNT_LESS_THAN_REDEEM_THRESHOLD = "415";
  string public constant LP_AMOUNT_GREATER_THAN_MAX_REPAY = "416";
  string public constant LP_NFT_TOKEN_ID_EXCEED_MAX_LIMIT = "417";
  string public constant LP_NFT_SUPPLY_NUM_EXCEED_MAX_LIMIT = "418";
  //lend pool loan errors
  string public constant LPL_INVALID_LOAN_STATE = "480";
  string public constant LPL_INVALID_LOAN_AMOUNT = "481";
  string public constant LPL_INVALID_TAKEN_AMOUNT = "482";
  string public constant LPL_AMOUNT_OVERFLOW = "483";
  string public constant LPL_BID_PRICE_LESS_THAN_LIQUIDATION_PRICE = "484";
  string public constant LPL_BID_PRICE_LESS_THAN_HIGHEST_PRICE = "485";
  string public constant LPL_BID_REDEEM_DURATION_HAS_END = "486";
  string public constant LPL_BID_USER_NOT_SAME = "487";
  string public constant LPL_BID_REPAY_AMOUNT_NOT_ENOUGH = "488";
  string public constant LPL_BID_AUCTION_DURATION_HAS_END = "489";
  string public constant LPL_BID_AUCTION_DURATION_NOT_END = "490";
  string public constant LPL_BID_PRICE_LESS_THAN_BORROW = "491";
  string public constant LPL_INVALID_BIDDER_ADDRESS = "492";
  string public constant LPL_AMOUNT_LESS_THAN_BID_FINE = "493";
  string public constant LPL_INVALID_BID_FINE = "494";
  //common token errors
  string public constant CT_CALLER_MUST_BE_LEND_POOL = "500"; // 'The caller of this function must be a lending pool'
  string public constant CT_INVALID_MINT_AMOUNT = "501"; //invalid amount to mint
  string public constant CT_INVALID_BURN_AMOUNT = "502"; //invalid amount to burn
  string public constant CT_BORROW_ALLOWANCE_NOT_ENOUGH = "503";
  //reserve logic errors
  string public constant RL_RESERVE_ALREADY_INITIALIZED = "601"; // 'Reserve has already been initialized'
  string public constant RL_LIQUIDITY_INDEX_OVERFLOW = "602"; //  Liquidity index overflows uint128
  string public constant RL_VARIABLE_BORROW_INDEX_OVERFLOW = "603"; //  Variable borrow index overflows uint128
  string public constant RL_LIQUIDITY_RATE_OVERFLOW = "604"; //  Liquidity rate overflows uint128
  string public constant RL_VARIABLE_BORROW_RATE_OVERFLOW = "605"; //  Variable borrow rate overflows uint128
  //configure errors
  string public constant LPC_RESERVE_LIQUIDITY_NOT_0 = "700"; // 'The liquidity of the reserve needs to be 0'
  string public constant LPC_INVALID_CONFIGURATION = "701"; // 'Invalid risk parameters for the reserve'
  string public constant LPC_CALLER_NOT_EMERGENCY_ADMIN = "702"; // 'The caller must be the emergency admin'
  string public constant LPC_INVALIED_BNFT_ADDRESS = "703";
  string public constant LPC_INVALIED_LOAN_ADDRESS = "704";
  string public constant LPC_NFT_LIQUIDITY_NOT_0 = "705";
  //reserve config errors
  string public constant RC_INVALID_LTV = "730";
  string public constant RC_INVALID_LIQ_THRESHOLD = "731";
  string public constant RC_INVALID_LIQ_BONUS = "732";
  string public constant RC_INVALID_DECIMALS = "733";
  string public constant RC_INVALID_RESERVE_FACTOR = "734";
  string public constant RC_INVALID_REDEEM_DURATION = "735";
  string public constant RC_INVALID_AUCTION_DURATION = "736";
  string public constant RC_INVALID_REDEEM_FINE = "737";
  string public constant RC_INVALID_REDEEM_THRESHOLD = "738";
  string public constant RC_INVALID_MIN_BID_FINE = "739";
  string public constant RC_INVALID_MAX_BID_FINE = "740";
  //address provider erros
  string public constant LPAPR_PROVIDER_NOT_REGISTERED = "760"; // 'Provider is not registered'
  string public constant LPAPR_INVALID_ADDRESSES_PROVIDER_ID = "761";
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
library DataTypes {
  struct ReserveData {
    //stores the reserve configuration
    ReserveConfigurationMap configuration;
    //the liquidity index. Expressed in ray
    uint128 liquidityIndex;
    //variable borrow index. Expressed in ray
    uint128 variableBorrowIndex;
    //the current supply rate. Expressed in ray
    uint128 currentLiquidityRate;
    //the current variable borrow rate. Expressed in ray
    uint128 currentVariableBorrowRate;
    uint40 lastUpdateTimestamp;
    //tokens addresses
    address bTokenAddress;
    address debtTokenAddress;
    //address of the interest rate strategy
    address interestRateAddress;
    //the id of the reserve. Represents the position in the list of the active reserves
    uint8 id;
  }
  struct NftData {
    //stores the nft configuration
    NftConfigurationMap configuration;
    //address of the bNFT contract
    address bNftAddress;
    //the id of the nft. Represents the position in the list of the active nfts
    uint8 id;
    uint256 maxSupply;
    uint256 maxTokenId;
  }
  struct ReserveConfigurationMap {
    //bit 0-15: LTV
    //bit 16-31: Liq. threshold
    //bit 32-47: Liq. bonus
    //bit 48-55: Decimals
    //bit 56: Reserve is active
    //bit 57: reserve is frozen
    //bit 58: borrowing is enabled
    //bit 59: stable rate borrowing enabled
    //bit 60-63: reserved
    //bit 64-79: reserve factor
    uint256 data;
  }
  struct NftConfigurationMap {
    //bit 0-15: LTV
    //bit 16-31: Liq. threshold
    //bit 32-47: Liq. bonus
    //bit 56: NFT is active
    //bit 57: NFT is frozen
    uint256 data;
  }
  /**
   * @dev Enum describing the current state of a loan
   * State change flow:
   *  Created -> Active -> Repaid
   *                    -> Auction -> Defaulted
   */
  enum LoanState {
    // We need a default that is not 'Created' - this is the zero value
    None,
    // The loan data is stored, but not initiated yet.
    Created,
    // The loan has been initialized, funds have been delivered to the borrower and the collateral is held.
    Active,
    // The loan is in auction, higest price liquidator will got chance to claim it.
    Auction,
    // The loan has been repaid, and the collateral has been returned to the borrower. This is a terminal state.
    Repaid,
    // The loan was delinquent and collateral claimed by the liquidator. This is a terminal state.
    Defaulted
  }
  struct LoanData {
    //the id of the nft loan
    uint256 loanId;
    //the current state of the loan
    LoanState state;
    //address of borrower
    address borrower;
    //address of nft asset token
    address nftAsset;
    //the id of nft token
    uint256 nftTokenId;
    //address of reserve asset token
    address reserveAsset;
    //scaled borrow amount. Expressed in ray
    uint256 scaledAmount;
    //start time of first bid time
    uint256 bidStartTimestamp;
    //bidder address of higest bid
    address bidderAddress;
    //price of higest bid
    uint256 bidPrice;
    //borrow amount of loan
    uint256 bidBorrowAmount;
    //bidder address of first bid
    address firstBidderAddress;
  }
  struct ExecuteDepositParams {
    address initiator;
    address asset;
    uint256 amount;
    address onBehalfOf;
    uint16 referralCode;
  }
  struct ExecuteWithdrawParams {
    address initiator;
    address asset;
    uint256 amount;
    address to;
  }
  struct ExecuteBorrowParams {
    address initiator;
    address asset;
    uint256 amount;
    address nftAsset;
    uint256 nftTokenId;
    address onBehalfOf;
    uint16 referralCode;
  }
  struct ExecuteBatchBorrowParams {
    address initiator;
    address[] assets;
    uint256[] amounts;
    address[] nftAssets;
    uint256[] nftTokenIds;
    address onBehalfOf;
    uint16 referralCode;
  }
  struct ExecuteRepayParams {
    address initiator;
    address nftAsset;
    uint256 nftTokenId;
    uint256 amount;
  }
  struct ExecuteBatchRepayParams {
    address initiator;
    address[] nftAssets;
    uint256[] nftTokenIds;
    uint256[] amounts;
  }
  struct ExecuteAuctionParams {
    address initiator;
    address nftAsset;
    uint256 nftTokenId;
    uint256 bidPrice;
    address onBehalfOf;
  }
  struct ExecuteRedeemParams {
    address initiator;
    address nftAsset;
    uint256 nftTokenId;
    uint256 amount;
    uint256 bidFine;
  }
  struct ExecuteLiquidateParams {
    address initiator;
    address nftAsset;
    uint256 nftTokenId;
    uint256 amount;
  }
  struct ExecuteLendPoolStates {
    uint256 pauseStartTime;
    uint256 pauseDurationTime;
  }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);
    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.0;
import "../IERC20Upgradeable.sol";
import "../../../utils/AddressUpgradeable.sol";
/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20Upgradeable {
    using AddressUpgradeable for address;
    function safeTransfer(
        IERC20Upgradeable token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }
    function safeTransferFrom(
        IERC20Upgradeable token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }
    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }
    function safeIncreaseAllowance(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    function safeDecreaseAllowance(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }
    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20Upgradeable token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.
        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165Upgradeable.sol";
/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721Upgradeable is IERC165Upgradeable {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);
    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;
    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);
    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;
    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
interface IIncentivesController {
  /**
   * @dev Called by the corresponding asset on any update that affects the rewards distribution
   * @param asset The address of the user
   * @param totalSupply The total supply of the asset in the lending pool
   * @param userBalance The balance of the user of the asset in the lending pool
   **/
  function handleAction(
    address asset,
    uint256 totalSupply,
    uint256 userBalance
  ) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
interface IScaledBalanceToken {
  /**
   * @dev Returns the scaled balance of the user. The scaled balance is the sum of all the
   * updated stored balance divided by the reserve's liquidity index at the moment of the update
   * @param user The user whose balance is calculated
   * @return The scaled balance of the user
   **/
  function scaledBalanceOf(address user) external view returns (uint256);
  /**
   * @dev Returns the scaled balance of the user and the scaled total supply.
   * @param user The address of the user
   * @return The scaled balance of the user
   * @return The scaled balance and the scaled total supply
   **/
  function getScaledUserBalanceAndSupply(address user) external view returns (uint256, uint256);
  /**
   * @dev Returns the scaled total supply of the variable debt token. Represents sum(debt/index)
   * @return The scaled total supply
   **/
  function scaledTotalSupply() external view returns (uint256);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)
pragma solidity ^0.8.0;
import "../IERC20Upgradeable.sol";
/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20MetadataUpgradeable is IERC20Upgradeable {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);
    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);
    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)
pragma solidity ^0.8.0;
/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165Upgradeable {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}