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// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import {IERC20} from "./IERC20.sol";
import {SafeERC20} from "./SafeERC20.sol";
import {IMarginPool} from "./IMarginPool.sol";
import {IXToken} from "./IXToken.sol";
import {WadRayMath} from "./WadRayMath.sol";
import {Errors} from "./Errors.sol";
import {IncentivizedERC20} from "./IncentivizedERC20.sol";
import {SafeMath} from "./SafeMath.sol";
import {
    IMarginPoolAddressesProvider
} from "./IMarginPoolAddressesProvider.sol";
import {Address} from "./Address.sol";

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + (((a % 2) + (b % 2)) / 2);
    }
}

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the `nonReentrant` modifier
 * available, which can be aplied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 */
contract ReentrancyGuard {
    /// @dev counter to allow mutex lock with only one SSTORE operation
    uint256 private _guardCounter;

    constructor() internal {
        // The counter starts at one to prevent changing it from zero to a non-zero
        // value, which is a more expensive operation.
        _guardCounter = 1;
    }

    /**
     * @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 make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _guardCounter += 1;
        uint256 localCounter = _guardCounter;
        _;
        require(
            localCounter == _guardCounter,
            "ReentrancyGuard: reentrant call"
        );
    }
}

/**
 * @title Lever ERC20 XToken
 * @dev Implementation of the interest bearing token for the Lever protocol
 * @author Lever
 */
contract XToken is
    IncentivizedERC20,
    IXToken,
    ReentrancyGuard
{
    using WadRayMath for uint256;
    using SafeERC20 for IERC20;
    // address public rewardsDistribution;
    IERC20 public rewardsToken;
    uint256 public periodFinish = 0;
    uint256 public rewardRate = 0;
    uint256 public rewardsDuration = 30 days;
    uint256 public lastUpdateTime;
    uint256 public rewardPerTokenStored;

    mapping(address => uint256) public userRewardPerTokenPaid;
    mapping(address => uint256) public rewards;

    bytes public constant EIP712_REVISION = bytes("1");
    bytes32 internal constant EIP712_DOMAIN =
        keccak256(
            "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
        );
    bytes32 public constant PERMIT_TYPEHASH =
        keccak256(
            "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
        );

    uint256 public constant UINT_MAX_VALUE = uint256(-1);
    address public immutable UNDERLYING_ASSET_ADDRESS;
    address public immutable RESERVE_TREASURY_ADDRESS;
    IMarginPool public immutable POOL;
    IMarginPoolAddressesProvider public addressesProvider;

    /// @dev owner => next valid nonce to submit with permit()
    mapping(address => uint256) public _nonces;

    bytes32 public DOMAIN_SEPARATOR;

    /* ========== MODIFIERS ========== */

    modifier updateReward(address account) {
        rewardPerTokenStored = rewardPerToken();
        lastUpdateTime = lastTimeRewardApplicable();
        if (account != address(0)) {
            rewards[account] = earned(account);
            userRewardPerTokenPaid[account] = rewardPerTokenStored;
        }
        _;
    }

    modifier onlyRewardsDistribution() {
        require(
            msg.sender == addressesProvider.getRewardsDistribution(),
            "Caller is not RewardsDistribution contract"
        );
        _;
    }

    modifier onlyMarginPool {
        require(
            _msgSender() == address(POOL),
            Errors.CT_CALLER_MUST_BE_MARGIN_POOL
        );
        _;
    }

    constructor(
        address _addressesProvider,
        address underlyingAssetAddress,
        string memory tokenName,
        string memory tokenSymbol,
        uint8 decimals
    ) public IncentivizedERC20(tokenName, tokenSymbol, decimals) {
        addressesProvider = IMarginPoolAddressesProvider(_addressesProvider);
        POOL = IMarginPool(addressesProvider.getMarginPool());
        UNDERLYING_ASSET_ADDRESS = underlyingAssetAddress;
        RESERVE_TREASURY_ADDRESS = addressesProvider.getTreasuryAddress();
        // rewardsDistribution = addressesProvider.getRewardsDistribution();
        rewardsToken = IERC20(IMarginPoolAddressesProvider(_addressesProvider).getLeverToken());
    }

    /**
     * @dev Burns xTokens from `user` and sends the equivalent amount of underlying to `receiverOfUnderlying`
     * - Only callable by the MarginPool, as extra state updates there need to be managed
     * @param user The owner of the xTokens, 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 onlyMarginPool updateReward(user) {
        uint256 amountScaled = amount.rayDiv(index);
        require(amountScaled != 0, Errors.CT_INVALID_BURN_AMOUNT);
        _burn(user, amountScaled);
        if (receiverOfUnderlying != address(this)) {
            IERC20(UNDERLYING_ASSET_ADDRESS).safeTransfer(
                receiverOfUnderlying,
                amount
            );
        }

        emit Transfer(user, address(0), amount);
        emit Burn(user, receiverOfUnderlying, amount, index);
    }

    /**
     * @dev Mints `amount` xTokens to `user`
     * - Only callable by the MarginPool, 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 onlyMarginPool updateReward(user) returns (bool) {
        uint256 previousBalance = super.balanceOf(user);

        uint256 amountScaled = amount.rayDiv(index);
        require(amountScaled != 0, Errors.CT_INVALID_MINT_AMOUNT);
        _mint(user, amountScaled);
        emit Transfer(address(0), user, amount);
        emit Mint(user, amount, index);

        return previousBalance == 0;
    }

    /**
     * @dev Mints xTokens to the reserve treasury
     * - Only callable by the MarginPool
     * @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
        onlyMarginPool
        updateReward(RESERVE_TREASURY_ADDRESS)
    {
        if (amount == 0) {
            return;
        }

        // 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(RESERVE_TREASURY_ADDRESS, amount.rayDiv(index));
        emit Transfer(address(0), RESERVE_TREASURY_ADDRESS, amount);
        emit Mint(RESERVE_TREASURY_ADDRESS, amount, index);
    }

    /**
     * @dev Transfers xTokens in the event of a borrow being liquidated, in case the liquidators reclaims the xToken
     * - Only callable by the MarginPool
     * @param from The address getting liquidated, current owner of the xTokens
     * @param to The recipient
     * @param value The amount of tokens getting transferred
     **/
    function transferOnLiquidation(
        address from,
        address to,
        uint256 value
    ) external override onlyMarginPool updateReward(from) updateReward(to) {
        // Being a normal transfer, the Transfer() and BalanceTransfer() are emitted
        // so no need to emit a specific event here
        _transfer(from, to, value, false);
        emit Transfer(from, to, value);
    }

    /**
     * @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(IncentivizedERC20, IERC20)
        returns (uint256)
    {
        return
            super.balanceOf(user).rayMul(
                POOL.getReserveNormalizedIncome(UNDERLYING_ASSET_ADDRESS)
            );
    }

    /**
     * @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 xToken
     * 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(IncentivizedERC20, IERC20)
        returns (uint256)
    {
        uint256 currentSupplyScaled = super.totalSupply();

        if (currentSupplyScaled == 0) {
            return 0;
        }

        return
            currentSupplyScaled.rayMul(
                POOL.getReserveNormalizedIncome(UNDERLYING_ASSET_ADDRESS)
            );
    }

    /**
     * @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 Transfers the underlying asset to `target`. Used by the MarginPool to transfer
     * assets in borrow(), withdraw()
     * @param target The recipient of the xTokens
     * @param amount The amount getting transferred
     * @return The amount transferred
     **/
    function transferUnderlyingTo(address target, uint256 amount)
        external
        override
        onlyMarginPool
        returns (uint256)
    {
        IERC20(UNDERLYING_ASSET_ADDRESS).safeTransfer(target, amount);
        return amount;
    }

    /**
     * @dev implements the permit function as for
     * https://github.com/ethereum/EIPs/blob/8a34d644aacf0f9f8f00815307fd7dd5da07655f/EIPS/eip-2612.md
     * @param owner The owner of the funds
     * @param spender The spender
     * @param value The amount
     * @param deadline The deadline timestamp, type(uint256).max for max deadline
     * @param v Signature param
     * @param s Signature param
     * @param r Signature param
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        require(owner != address(0), "INVALID_OWNER");
        //solium-disable-next-line
        require(block.timestamp <= deadline, "INVALID_EXPIRATION");
        uint256 currentValidNonce = _nonces[owner];
        bytes32 digest =
            keccak256(
                abi.encodePacked(
                    "\x19\x01",
                    DOMAIN_SEPARATOR,
                    keccak256(
                        abi.encode(
                            PERMIT_TYPEHASH,
                            owner,
                            spender,
                            value,
                            currentValidNonce,
                            deadline
                        )
                    )
                )
            );
        require(owner == ecrecover(digest, v, r, s), "INVALID_SIGNATURE");
        _nonces[owner] = currentValidNonce.add(1);
        _approve(owner, spender, value);
    }

    /**
     * @dev Transfers the xTokens 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 updateReward(from) updateReward(to) {
        uint256 index =
            POOL.getReserveNormalizedIncome(UNDERLYING_ASSET_ADDRESS);

        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(
                UNDERLYING_ASSET_ADDRESS,
                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);
    }

    function lastTimeRewardApplicable() public view returns (uint256) {
        return Math.min(block.timestamp, periodFinish);
    }

    function rewardPerToken() public view returns (uint256) {
        if (totalSupply() == 0) {
            return rewardPerTokenStored;
        }
        return
            rewardPerTokenStored.add(
                lastTimeRewardApplicable()
                    .sub(lastUpdateTime)
                    .mul(rewardRate)
                    .mul(1e18)
                    .div(totalSupply())
            );
    }

    function earned(address account) public view returns (uint256) {
        return
            balanceOf(account)
                .mul(rewardPerToken().sub(userRewardPerTokenPaid[account]))
                .div(1e18)
                .add(rewards[account]);
    }

    function getRewardForDuration() external view returns (uint256) {
        return rewardRate.mul(rewardsDuration);
    }

    function getReward() public nonReentrant updateReward(msg.sender) {
        uint256 reward = rewards[msg.sender];
        require(reward > 0);
        rewards[msg.sender] = 0;
        rewardsToken.safeTransfer(msg.sender, reward);
        emit RewardPaid(msg.sender, reward);
    }

    /* ========== RESTRICTED FUNCTIONS ========== */

    function notifyRewardAmount(uint256 reward, uint256 _rewardsDuration)
        external
        onlyRewardsDistribution
        updateReward(address(0))
    {
        // Ensure the provided reward amount is not more than the balance in the contract.
        // This keeps the reward rate in the right range, preventing overflows due to
        // very high values of rewardRate in the earned and rewardsPerToken functions;
        // Reward + leftover must be less than 2^256 / 10^18 to avoid overflow.
        uint256 balance = rewardsToken.balanceOf(address(this));
        if (block.timestamp >= periodFinish) {
            rewardsDuration = _rewardsDuration;
            rewardRate = reward.div(rewardsDuration);
            require(
                rewardRate <= balance.div(rewardsDuration),
                "Provided reward too high"
            );
            periodFinish = block.timestamp.add(rewardsDuration);
        } else {
            uint256 remaining = periodFinish.sub(block.timestamp);
            uint256 leftover = remaining.mul(rewardRate);
            rewardRate = reward.add(leftover).div(remaining);
            require(
                rewardRate <= balance.div(remaining),
                "Provided reward too high"
            );
        }

        lastUpdateTime = block.timestamp;
        emit RewardAdded(reward, _rewardsDuration);
    }

    /* ========== EVENTS ========== */

    event RewardAdded(uint256 reward, uint256 _rewardsDuration);
    event RewardPaid(address indexed user, uint256 reward);
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

/**
 * @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) {
    // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
    // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
    // for accounts without code, i.e. `keccak256('')`
    bytes32 codehash;
    bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
    // solhint-disable-next-line no-inline-assembly
    assembly {
      codehash := extcodehash(account)
    }
    return (codehash != accountHash && codehash != 0x0);
  }

  /**
   * @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');

    // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
    (bool success, ) = recipient.call{value: amount}('');
    require(success, 'Address: unable to send value, recipient may have reverted');
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import './BaseAdminUpgradeabilityProxy.sol';

/**
 * @title AdminUpgradeabilityProxy
 * @dev Extends from BaseAdminUpgradeabilityProxy with a constructor for
 * initializing the implementation, admin, and init data.
 */
contract AdminUpgradeabilityProxy is BaseAdminUpgradeabilityProxy, UpgradeabilityProxy {
  /**
   * Contract constructor.
   * @param _logic address of the initial implementation.
   * @param _admin Address of the proxy administrator.
   * @param _data Data to send as msg.data to the implementation to initialize the proxied contract.
   * It should include the signature and the parameters of the function to be called, as described in
   * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
   * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped.
   */
  constructor(
    address _logic,
    address _admin,
    bytes memory _data
  ) public payable UpgradeabilityProxy(_logic, _data) {
    assert(ADMIN_SLOT == bytes32(uint256(keccak256('eip1967.proxy.admin')) - 1));
    _setAdmin(_admin);
  }

  /**
   * @dev Only fall back when the sender is not the admin.
   */
  function _willFallback() internal override(BaseAdminUpgradeabilityProxy, Proxy) {
    BaseAdminUpgradeabilityProxy._willFallback();
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import './UpgradeabilityProxy.sol';

/**
 * @title BaseAdminUpgradeabilityProxy
 * @dev This contract combines an upgradeability proxy with an authorization
 * mechanism for administrative tasks.
 * All external functions in this contract must be guarded by the
 * `ifAdmin` modifier. See ethereum/solidity#3864 for a Solidity
 * feature proposal that would enable this to be done automatically.
 */
contract BaseAdminUpgradeabilityProxy is BaseUpgradeabilityProxy {
  /**
   * @dev Emitted when the administration has been transferred.
   * @param previousAdmin Address of the previous admin.
   * @param newAdmin Address of the new admin.
   */
  event AdminChanged(address previousAdmin, address newAdmin);

  /**
   * @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 Modifier to check whether the `msg.sender` is the admin.
   * If it is, it will run the function. Otherwise, it will delegate the call
   * to the implementation.
   */
  modifier ifAdmin() {
    if (msg.sender == _admin()) {
      _;
    } else {
      _fallback();
    }
  }

  /**
   * @return The address of the proxy admin.
   */
  function admin() external ifAdmin returns (address) {
    return _admin();
  }

  /**
   * @return The address of the implementation.
   */
  function implementation() external ifAdmin returns (address) {
    return _implementation();
  }

  /**
   * @dev Changes the admin of the proxy.
   * Only the current admin can call this function.
   * @param newAdmin Address to transfer proxy administration to.
   */
  function changeAdmin(address newAdmin) external ifAdmin {
    require(newAdmin != address(0), 'Cannot change the admin of a proxy to the zero address');
    emit AdminChanged(_admin(), newAdmin);
    _setAdmin(newAdmin);
  }

  /**
   * @dev Upgrade the backing implementation of the proxy.
   * Only the admin can call this function.
   * @param newImplementation Address of the new implementation.
   */
  function upgradeTo(address newImplementation) external ifAdmin {
    _upgradeTo(newImplementation);
  }

  /**
   * @dev Upgrade the backing implementation of the proxy and call a function
   * on the new implementation.
   * This is useful to initialize the proxied contract.
   * @param newImplementation Address of the new implementation.
   * @param data Data to send as msg.data in the low level call.
   * It should include the signature and the parameters of the function to be called, as described in
   * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
   */
  function upgradeToAndCall(address newImplementation, bytes calldata data)
    external
    payable
    ifAdmin
  {
    _upgradeTo(newImplementation);
    (bool success, ) = newImplementation.delegatecall(data);
    require(success, "upgradeToAndCall failed");
  }

  /**
   * @return adm The admin slot.
   */
  function _admin() internal view returns (address adm) {
    bytes32 slot = ADMIN_SLOT;
    //solium-disable-next-line
    assembly {
      adm := sload(slot)
    }
  }

  /**
   * @dev Sets the address of the proxy admin.
   * @param newAdmin Address of the new proxy admin.
   */
  function _setAdmin(address newAdmin) internal {
    bytes32 slot = ADMIN_SLOT;
    //solium-disable-next-line
    assembly {
      sstore(slot, newAdmin)
    }
  }

  /**
   * @dev Only fall back when the sender is not the admin.
   */
  function _willFallback() internal virtual override {
    require(msg.sender != _admin(), 'Cannot call fallback function from the proxy admin');
    super._willFallback();
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import './BaseUpgradeabilityProxy.sol';

/**
 * @title BaseImmutableAdminUpgradeabilityProxy
 * @author Lever, inspired by the OpenZeppelin upgradeability proxy pattern
 * @dev This contract combines an upgradeability proxy with an authorization
 * mechanism for administrative tasks. The admin role is stored in an immutable, which
 * helps saving transactions costs
 * All external functions in this contract must be guarded by the
 * `ifAdmin` modifier. See ethereum/solidity#3864 for a Solidity
 * feature proposal that would enable this to be done automatically.
 */
contract BaseImmutableAdminUpgradeabilityProxy is BaseUpgradeabilityProxy {
  address immutable ADMIN;

  constructor(address admin) public {
    ADMIN = admin;
  }

  modifier ifAdmin() {
    if (msg.sender == ADMIN) {
      _;
    } else {
      _fallback();
    }
  }

  /**
   * @return The address of the proxy admin.
   */
  function admin() external ifAdmin returns (address) {
    return ADMIN;
  }

  /**
   * @return The address of the implementation.
   */
  function implementation() external ifAdmin returns (address) {
    return _implementation();
  }

  /**
   * @dev Upgrade the backing implementation of the proxy.
   * Only the admin can call this function.
   * @param newImplementation Address of the new implementation.
   */
  function upgradeTo(address newImplementation) external ifAdmin {
    _upgradeTo(newImplementation);
  }

  /**
   * @dev Upgrade the backing implementation of the proxy and call a function
   * on the new implementation.
   * This is useful to initialize the proxied contract.
   * @param newImplementation Address of the new implementation.
   * @param data Data to send as msg.data in the low level call.
   * It should include the signature and the parameters of the function to be called, as described in
   * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
   */
  function upgradeToAndCall(address newImplementation, bytes calldata data)
    external
    payable
    ifAdmin
  {
    _upgradeTo(newImplementation);
    (bool success, ) = newImplementation.delegatecall(data);
    require(success, "upgradeToAndCall failed");
  }

  /**
   * @dev Only fall back when the sender is not the admin.
   */
  function _willFallback() internal virtual override {
    require(msg.sender != ADMIN, 'Cannot call fallback function from the proxy admin');
    super._willFallback();
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import './Proxy.sol';
import './Address.sol';

/**
 * @title BaseUpgradeabilityProxy
 * @dev This contract implements a proxy that allows to change the
 * implementation address to which it will delegate.
 * Such a change is called an implementation upgrade.
 */
contract BaseUpgradeabilityProxy is Proxy {
  /**
   * @dev Emitted when the implementation is upgraded.
   * @param implementation Address of the new implementation.
   */
  event Upgraded(address indexed implementation);

  /**
   * @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 Returns the current implementation.
   * @return impl Address of the current implementation
   */
  function _implementation() internal view override returns (address impl) {
    bytes32 slot = IMPLEMENTATION_SLOT;
    //solium-disable-next-line
    assembly {
      impl := sload(slot)
    }
  }

  /**
   * @dev Upgrades the proxy to a new implementation.
   * @param newImplementation Address of the new implementation.
   */
  function _upgradeTo(address newImplementation) internal {
    _setImplementation(newImplementation);
    emit Upgraded(newImplementation);
  }

  /**
   * @dev Sets the implementation address of the proxy.
   * @param newImplementation Address of the new implementation.
   */
  function _setImplementation(address newImplementation) internal {
    require(
      Address.isContract(newImplementation),
      'Cannot set a proxy implementation to a non-contract address'
    );

    bytes32 slot = IMPLEMENTATION_SLOT;

    //solium-disable-next-line
    assembly {
      sstore(slot, newImplementation)
    }
  }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;

/*
 * @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 GSN 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 payable) {
    return msg.sender;
  }

  function _msgData() internal view virtual returns (bytes memory) {
    this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
    return msg.data;
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

library DataTypes {
  // refer to the whitepaper, section 1.1 basic concepts for a formal description of these properties.
  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 xTokenAddress;
    address variableDebtTokenAddress;
    //address of the interest rate strategy
    address interestRateStrategyAddress;
    //the id of the reserve. Represents the position in the list of the active reserves
    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 60-63: reserved
    //bit 64-79: reserve factor
    uint256 data;
  }

  struct UserConfigurationMap {
    uint256 data;
  }

}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import {IMarginPool} from './IMarginPool.sol';
import {ICreditDelegationToken} from './ICreditDelegationToken.sol';
import {IncentivizedERC20} from './IncentivizedERC20.sol';
import {Errors} from './Errors.sol';

/**
 * @title DebtTokenBase
 * @author Lever
 */

abstract contract DebtTokenBase is
  IncentivizedERC20,
  ICreditDelegationToken
{
  address public immutable UNDERLYING_ASSET_ADDRESS;
  IMarginPool public immutable POOL;

  mapping(address => mapping(address => uint256)) internal _borrowAllowances;

  /**
   * @dev Only margin pool can call functions marked by this modifier
   **/
  modifier onlyMarginPool {
    require(_msgSender() == address(POOL), Errors.CT_CALLER_MUST_BE_MARGIN_POOL);
    _;
  }

  /**
   * @dev The metadata of the token will be set on the proxy, that the reason of
   * passing "NULL" and 0 as metadata
   */
  constructor(
    address pool,
    address underlyingAssetAddress,
    string memory name,
    string memory symbol,
    uint8 decimals
  ) public IncentivizedERC20(name, symbol, decimals) {
    POOL = IMarginPool(pool);
    UNDERLYING_ASSET_ADDRESS = underlyingAssetAddress;
  }


  /**
   * @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, UNDERLYING_ASSET_ADDRESS, 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];
  }

  /**
   * @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');
  }

  function _decreaseBorrowAllowance(
    address delegator,
    address delegatee,
    uint256 amount
  ) internal {
    uint256 newAllowance =
      _borrowAllowances[delegator][delegatee].sub(amount, Errors.BORROW_ALLOWANCE_NOT_ENOUGH);

    _borrowAllowances[delegator][delegatee] = newAllowance;

    emit BorrowAllowanceDelegated(delegator, delegatee, UNDERLYING_ASSET_ADDRESS, newAllowance);
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import {SafeMath} from './SafeMath.sol';
import {IReserveInterestRateStrategy} from './IReserveInterestRateStrategy.sol';
import {WadRayMath} from './WadRayMath.sol';
import {PercentageMath} from './PercentageMath.sol';
import {IMarginPoolAddressesProvider} from './IMarginPoolAddressesProvider.sol';

/**
 * @title DefaultReserveInterestRateStrategy 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 Lever
 **/
contract DefaultReserveInterestRateStrategy is IReserveInterestRateStrategy {
  using WadRayMath for uint256;
  using SafeMath for uint256;
  using PercentageMath for uint256;

  /**
   * @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;

  IMarginPoolAddressesProvider public immutable addressesProvider;

  // 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(
    IMarginPoolAddressesProvider provider,
    uint256 optimalUtilizationRate,
    uint256 baseVariableBorrowRate,
    uint256 variableRateSlope1,
    uint256 variableRateSlope2
  ) public {
    OPTIMAL_UTILIZATION_RATE = optimalUtilizationRate;
    EXCESS_UTILIZATION_RATE = WadRayMath.ray().sub(optimalUtilizationRate);
    addressesProvider = provider;
    _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.add(_variableRateSlope1).add(_variableRateSlope2);
  }

  struct CalcInterestRatesLocalVars {
    uint256 totalDebt;
    uint256 currentVariableBorrowRate;
    uint256 currentLiquidityRate;
    uint256 utilizationRate;
  }

  /**
   * @dev Calculates the interest rates depending on the reserve's state and configurations
   * @param availableLiquidity The liquidity available in the reserve
   * @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 address.
   * @return The liquidity rate, the variable borrow rate
   **/
  function calculateInterestRates(
    uint256 availableLiquidity,
    uint256 totalVariableDebt,
    uint256 reserveFactor
  )
    external
    view
    override
    returns (
      uint256,
      uint256
    )
  {
    CalcInterestRatesLocalVars memory vars;
    vars.totalDebt = totalVariableDebt;
    vars.currentVariableBorrowRate = 0;
    vars.currentLiquidityRate = 0;

    uint256 utilizationRate =
      vars.totalDebt == 0 ? 0 : vars.totalDebt.rayDiv(availableLiquidity.add(vars.totalDebt));

    if (utilizationRate > OPTIMAL_UTILIZATION_RATE) {
      uint256 excessUtilizationRateRatio =
        utilizationRate.sub(OPTIMAL_UTILIZATION_RATE).rayDiv(EXCESS_UTILIZATION_RATE);


      vars.currentVariableBorrowRate = _baseVariableBorrowRate.add(_variableRateSlope1).add(
        _variableRateSlope2.rayMul(excessUtilizationRateRatio)
      );
    } else {
      vars.currentVariableBorrowRate = _baseVariableBorrowRate.add(
        utilizationRate.rayMul(_variableRateSlope1).rayDiv(OPTIMAL_UTILIZATION_RATE)
      );
    }

    vars.currentLiquidityRate = _getOverallBorrowRate(
      totalVariableDebt,
      vars.currentVariableBorrowRate
    )
      .rayMul(utilizationRate)
      .percentMul(PercentageMath.PERCENTAGE_FACTOR.sub(reserveFactor));

    return (
      vars.currentLiquidityRate,
      vars.currentVariableBorrowRate
    );
  }

  /**
   * @dev Calculates the overall borrow rate as the weighted average between the total variable 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) {

    if (totalVariableDebt == 0) return 0;

    uint256 weightedVariableRate = totalVariableDebt.wadToRay().rayMul(currentVariableBorrowRate);


    uint256 overallBorrowRate =
      weightedVariableRate.rayDiv(totalVariableDebt.wadToRay());

    return overallBorrowRate;
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import './Context.sol';
import './IERC20.sol';
import './SafeMath.sol';
import './Address.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 guidelines: functions revert instead
 * of 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 {
  using SafeMath for uint256;
  using Address for address;

  mapping(address => uint256) private _balances;

  mapping(address => mapping(address => uint256)) private _allowances;

  uint256 private _totalSupply;

  string private _name;
  string private _symbol;
  uint8 private _decimals;

  /**
   * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
   * a default value of 18.
   *
   * To select a different value for {decimals}, use {_setupDecimals}.
   *
   * All three of these values are immutable: they can only be set once during
   * construction.
   */
  constructor(string memory name, string memory symbol) public {
    _name = name;
    _symbol = symbol;
    _decimals = 18;
  }

  /**
   * @dev Returns the name of the token.
   */
  function name() public view returns (string memory) {
    return _name;
  }

  /**
   * @dev Returns the symbol of the token, usually a shorter version of the
   * name.
   */
  function symbol() public view 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 {_setupDecimals} is
   * called.
   *
   * 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 returns (uint8) {
    return _decimals;
  }

  /**
   * @dev See {IERC20-totalSupply}.
   */
  function totalSupply() public view override returns (uint256) {
    return _totalSupply;
  }

  /**
   * @dev See {IERC20-balanceOf}.
   */
  function balanceOf(address account) public view 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);
    _approve(
      sender,
      _msgSender(),
      _allowances[sender][_msgSender()].sub(amount, 'ERC20: transfer amount exceeds allowance')
    );
    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].add(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)
  {
    _approve(
      _msgSender(),
      spender,
      _allowances[_msgSender()][spender].sub(
        subtractedValue,
        'ERC20: decreased allowance below zero'
      )
    );
    return true;
  }

  /**
   * @dev Moves tokens `amount` from `sender` to `recipient`.
   *
   * This is 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);

    _balances[sender] = _balances[sender].sub(amount, 'ERC20: transfer amount exceeds balance');
    _balances[recipient] = _balances[recipient].add(amount);
    emit Transfer(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
   *
   * - `to` 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 = _totalSupply.add(amount);
    _balances[account] = _balances[account].add(amount);
    emit Transfer(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);

    _balances[account] = _balances[account].sub(amount, 'ERC20: burn amount exceeds balance');
    _totalSupply = _totalSupply.sub(amount);
    emit Transfer(account, address(0), amount);
  }

  /**
   * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
   *
   * This is 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 Sets {decimals} to a value other than the default one of 18.
   *
   * WARNING: This function should only be called from the constructor. Most
   * applications that interact with token contracts will not expect
   * {decimals} to ever change, and may work incorrectly if it does.
   */
  function _setupDecimals(uint8 decimals_) internal {
    _decimals = decimals_;
  }

  /**
   * @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 to 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 {}
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

/**
 * @title Errors library
 * @author Lever
 * @notice Defines the error messages emitted by the different contracts of the Lever protocol
 * @dev Error messages prefix glossary:
 *  - VL = ValidationLogic
 *  - MATH = Math libraries
 *  - CT = Common errors between tokens (XToken, VariableDebtToken)
 *  - XT = XToken
 *  - DT = VariableDebtToken
 *  - MP = MarginPool
 *  - MPAPR = MarginPoolAddressesProviderRegistry
 *  - MPC = MarginPoolConfiguration
 *  - RL = ReserveLogic
 *  - MPCM = MarginPoolCollateralManager
 *  - P = Pausable
 */
library Errors {
  //common errors
  string public constant CALLER_NOT_POOL_ADMIN = '33'; // 'The caller must be the pool admin'
  string public constant BORROW_ALLOWANCE_NOT_ENOUGH = '59'; // User borrows on behalf, but allowance are too small

  //contract specific errors
  string public constant VL_INVALID_AMOUNT = '1'; // 'Amount must be greater than 0'
  string public constant VL_NO_ACTIVE_RESERVE = '2'; // 'Action requires an active reserve'
  string public constant VL_RESERVE_FROZEN = '3'; // 'Action cannot be performed because the reserve is frozen'
  string public constant VL_CURRENT_AVAILABLE_LIQUIDITY_NOT_ENOUGH = '4'; // 'The current liquidity is not enough'
  string public constant VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE = '5'; // 'User cannot withdraw more than the available balance'
  string public constant VL_TRANSFER_NOT_ALLOWED = '6'; // 'Transfer cannot be allowed.'
  string public constant VL_BORROWING_NOT_ENABLED = '7'; // 'Borrowing is not enabled'
  string public constant VL_INVALID_INTEREST_RATE_MODE_SELECTED = '8'; // 'Invalid interest rate mode selected'
  string public constant VL_COLLATERAL_BALANCE_IS_0 = '9'; // 'The collateral balance is 0'
  string public constant VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD = '10'; // 'Health factor is lesser than the liquidation threshold'
  string public constant VL_COLLATERAL_CANNOT_COVER_NEW_BORROW = '11'; // 'There is not enough collateral to cover a new borrow'
  string public constant VL_COLLATERAL_SAME_AS_BORROWING_CURRENCY = '13'; // collateral is (mostly) the same currency that is being borrowed
  string public constant VL_NO_DEBT_OF_SELECTED_TYPE = '15'; // 'he needs to have variable debt'
  string public constant VL_NO_EXPLICIT_AMOUNT_TO_REPAY_ON_BEHALF = '16'; // 'To repay on behalf of an user an explicit amount to repay is needed'
  string public constant VL_NO_VARIABLE_RATE_LOAN_IN_RESERVE = '18'; // 'User does not have a variable rate loan in progress on this reserve'
  string public constant VL_UNDERLYING_BALANCE_NOT_GREATER_THAN_0 = '19'; // 'The underlying balance needs to be greater than 0'
  string public constant VL_DEPOSIT_ALREADY_IN_USE = '20'; // 'User deposit is already being used as collateral'
  string public constant MP_INTEREST_RATE_REBALANCE_CONDITIONS_NOT_MET = '22'; // 'Interest rate rebalance conditions were not met'
  string public constant MP_LIQUIDATION_CALL_FAILED = '23'; // 'Liquidation call failed'
  string public constant MP_NOT_ENOUGH_LIQUIDITY_TO_BORROW = '24'; // 'There is not enough liquidity available to borrow'
  string public constant MP_REQUESTED_AMOUNT_TOO_SMALL = '25'; // 'The requested amount is too small for a FlashLoan.'
  string public constant MP_INCONSISTENT_PROTOCOL_ACTUAL_BALANCE = '26'; // 'The actual balance of the protocol is inconsistent'
  string public constant MP_CALLER_NOT_MARGIN_POOL_CONFIGURATOR = '27'; // 'The caller of the function is not the margin pool configurator'
  string public constant MP_INCONSISTENT_FLASHLOAN_PARAMS = '28';
  string public constant CT_CALLER_MUST_BE_MARGIN_POOL = '29'; // 'The caller of this function must be a margin pool'
  string public constant CT_CANNOT_GIVE_ALLOWANCE_TO_HIMSELF = '30'; // 'User cannot give allowance to himself'
  string public constant CT_TRANSFER_AMOUNT_NOT_GT_0 = '31'; // 'Transferred amount needs to be greater than zero'
  string public constant RL_RESERVE_ALREADY_INITIALIZED = '32'; // 'Reserve has already been initialized'
  string public constant MPC_RESERVE_LIQUIDITY_NOT_0 = '34'; // 'The liquidity of the reserve needs to be 0'
  string public constant MPC_INVALID_XTOKEN_POOL_ADDRESS = '35'; // 'The liquidity of the reserve needs to be 0'
  string public constant MPC_INVALID_VARIABLE_DEBT_TOKEN_POOL_ADDRESS = '37'; // 'The liquidity of the reserve needs to be 0'
  string public constant MPC_INVALID_VARIABLE_DEBT_TOKEN_UNDERLYING_ADDRESS = '39'; // 'The liquidity of the reserve needs to be 0'
  string public constant MPC_INVALID_ADDRESSES_PROVIDER_ID = '40'; // 'The liquidity of the reserve needs to be 0'
  string public constant MPC_INVALID_CONFIGURATION = '75'; // 'Invalid risk parameters for the reserve'
  string public constant MPC_CALLER_NOT_EMERGENCY_ADMIN = '76'; // 'The caller must be the emergency admin'
  string public constant MPAPR_PROVIDER_NOT_REGISTERED = '41'; // 'Provider is not registered'
  string public constant MPCM_HEALTH_FACTOR_NOT_BELOW_THRESHOLD = '42'; // 'Health factor is not below the threshold'
  string public constant MPCM_COLLATERAL_CANNOT_BE_LIQUIDATED = '43'; // 'The collateral chosen cannot be liquidated'
  string public constant MPCM_SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER = '44'; // 'User did not borrow the specified currency'
  string public constant MPCM_NOT_ENOUGH_LIQUIDITY_TO_LIQUIDATE = '45'; // "There isn't enough liquidity available to liquidate"
  string public constant MPCM_NO_ERRORS = '46'; // 'No errors'
  string public constant MP_INVALID_FLASHLOAN_MODE = '47'; //Invalid flashloan mode selected
  string public constant MATH_MULTIPLICATION_OVERFLOW = '48';
  string public constant MATH_ADDITION_OVERFLOW = '49';
  string public constant MATH_DIVISION_BY_ZERO = '50';
  string public constant RL_LIQUIDITY_INDEX_OVERFLOW = '51'; //  Liquidity index overflows uint128
  string public constant RL_VARIABLE_BORROW_INDEX_OVERFLOW = '52'; //  Variable borrow index overflows uint128
  string public constant RL_LIQUIDITY_RATE_OVERFLOW = '53'; //  Liquidity rate overflows uint128
  string public constant RL_VARIABLE_BORROW_RATE_OVERFLOW = '54'; //  Variable borrow rate overflows uint128
  string public constant CT_INVALID_MINT_AMOUNT = '56'; //invalid amount to mint
  string public constant MP_FAILED_REPAY_WITH_COLLATERAL = '57';
  string public constant CT_INVALID_BURN_AMOUNT = '58'; //invalid amount to burn
  string public constant MP_FAILED_COLLATERAL_SWAP = '60';
  string public constant MP_INVALID_EQUAL_ASSETS_TO_SWAP = '61';
  string public constant MP_REENTRANCY_NOT_ALLOWED = '62';
  string public constant MP_CALLER_MUST_BE_AN_XTOKEN = '63';
  string public constant MP_IS_PAUSED = '64'; // 'Pool is paused'
  string public constant MP_NO_MORE_RESERVES_ALLOWED = '65';
  string public constant MP_INVALID_FLASH_LOAN_EXECUTOR_RETURN = '66';
  string public constant RC_INVALID_LTV = '67';
  string public constant RC_INVALID_LIQ_THRESHOLD = '68';
  string public constant RC_INVALID_LIQ_BONUS = '69';
  string public constant RC_INVALID_DECIMALS = '70';
  string public constant RC_INVALID_RESERVE_FACTOR = '71';
  string public constant MPAPR_INVALID_ADDRESSES_PROVIDER_ID = '72';
  string public constant VL_INCONSISTENT_FLASHLOAN_PARAMS = '73';
  string public constant MP_INCONSISTENT_PARAMS_LENGTH = '74';
  string public constant UL_INVALID_INDEX = '77';
  string public constant MP_NOT_CONTRACT = '78';
  string public constant SDT_BURN_EXCEEDS_BALANCE = '80';

  enum CollateralManagerErrors {
    NO_ERROR,
    NO_COLLATERAL_AVAILABLE,
    COLLATERAL_CANNOT_BE_LIQUIDATED,
    CURRRENCY_NOT_BORROWED,
    HEALTH_FACTOR_ABOVE_THRESHOLD,
    NOT_ENOUGH_LIQUIDITY,
    NO_ACTIVE_RESERVE,
    HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD,
    INVALID_EQUAL_ASSETS_TO_SWAP,
    FROZEN_RESERVE
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import {SafeMath} from './SafeMath.sol';
import {IERC20} from './IERC20.sol';
import {ReserveLogic} from './ReserveLogic.sol';
import {ReserveConfiguration} from './ReserveConfiguration.sol';
import {UserConfiguration} from './UserConfiguration.sol';
import {WadRayMath} from './WadRayMath.sol';
import {PercentageMath} from './PercentageMath.sol';
import {IPriceOracleGetter} from './IPriceOracleGetter.sol';
import {DataTypes} from './DataTypes.sol';

/**
 * @title GenericLogic library
 * @author Lever
 * @title Implements protocol-level logic to calculate and validate the state of a user
 */
library GenericLogic {
  using ReserveLogic for DataTypes.ReserveData;
  using SafeMath for uint256;
  using WadRayMath for uint256;
  using PercentageMath for uint256;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  using UserConfiguration for DataTypes.UserConfigurationMap;

  uint256 public constant HEALTH_FACTOR_LIQUIDATION_THRESHOLD = 1 ether;

  struct balanceDecreaseAllowedLocalVars {
    uint256 decimals;
    uint256 liquidationThreshold;
    uint256 totalCollateralInETH;
    uint256 totalDebtInETH;
    uint256 avgLiquidationThreshold;
    uint256 amountToDecreaseInETH;
    uint256 collateralBalanceAfterDecrease;
    uint256 liquidationThresholdAfterDecrease;
    uint256 healthFactorAfterDecrease;
    bool reserveUsageAsCollateralEnabled;
  }

  /**
   * @dev Checks if a specific balance decrease is allowed
   * (i.e. doesn't bring the user borrow position health factor under HEALTH_FACTOR_LIQUIDATION_THRESHOLD)
   * @param asset The address of the underlying asset of the reserve
   * @param user The address of the user
   * @param amount The amount to decrease
   * @param reservesData The data of all the reserves
   * @param userConfig The user configuration
   * @param reserves The list of all the active reserves
   * @param oracle The address of the oracle contract
   * @return true if the decrease of the balance is allowed
   **/
  function balanceDecreaseAllowed(
    address asset,
    address user,
    uint256 amount,
    mapping(address => DataTypes.ReserveData) storage reservesData,
    DataTypes.UserConfigurationMap calldata userConfig,
    mapping(uint256 => address) storage reserves,
    uint256 reservesCount,
    address oracle
  ) external view returns (bool) {
    if (!userConfig.isBorrowingAny() || !userConfig.isUsingAsCollateral(reservesData[asset].id)) {
      return true;
    }

    balanceDecreaseAllowedLocalVars memory vars;

    (, vars.liquidationThreshold, , vars.decimals, ) = reservesData[asset]
      .configuration
      .getParams();

    if (vars.liquidationThreshold == 0) {
      return true;
    }

    (
      vars.totalCollateralInETH,
      vars.totalDebtInETH,
      ,
      vars.avgLiquidationThreshold,

    ) = calculateUserAccountData(user, reservesData, userConfig, reserves, reservesCount, oracle);

    if (vars.totalDebtInETH == 0) {
      return true;
    }

    vars.amountToDecreaseInETH = IPriceOracleGetter(oracle).getAssetPrice(asset).mul(amount).div(
      10**vars.decimals
    );

    vars.collateralBalanceAfterDecrease = vars.totalCollateralInETH.sub(vars.amountToDecreaseInETH);

    //if there is a borrow, there can't be 0 collateral
    if (vars.collateralBalanceAfterDecrease == 0) {
      return false;
    }

    vars.liquidationThresholdAfterDecrease = vars
      .totalCollateralInETH
      .mul(vars.avgLiquidationThreshold)
      .sub(vars.amountToDecreaseInETH.mul(vars.liquidationThreshold))
      .div(vars.collateralBalanceAfterDecrease);

    uint256 healthFactorAfterDecrease =
      calculateHealthFactorFromBalances(
        vars.collateralBalanceAfterDecrease,
        vars.totalDebtInETH,
        vars.liquidationThresholdAfterDecrease
      );

    return healthFactorAfterDecrease >= GenericLogic.HEALTH_FACTOR_LIQUIDATION_THRESHOLD;
  }

  struct CalculateUserAccountDataVars {
    uint256 reserveUnitPrice;
    uint256 tokenUnit;
    uint256 compoundedLiquidityBalance;
    uint256 compoundedBorrowBalance;
    uint256 decimals;
    uint256 ltv;
    uint256 liquidationThreshold;
    uint256 i;
    uint256 healthFactor;
    uint256 totalCollateralInETH;
    uint256 totalDebtInETH;
    uint256 avgLtv;
    uint256 avgLiquidationThreshold;
    uint256 reservesLength;
    bool healthFactorBelowThreshold;
    address currentReserveAddress;
    bool usageAsCollateralEnabled;
    bool userUsesReserveAsCollateral;
  }

  /**
   * @dev Calculates the user data across the reserves.
   * this includes the total liquidity/collateral/borrow balances in ETH,
   * the average Loan To Value, the average Liquidation Ratio, and the Health factor.
   * @param user The address of the user
   * @param reservesData Data of all the reserves
   * @param userConfig The configuration of the user
   * @param reserves The list of the available reserves
   * @param oracle The price oracle address
   * @return The total collateral and total debt of the user in ETH, the avg ltv, liquidation threshold and the HF
   **/
  function calculateUserAccountData(
    address user,
    mapping(address => DataTypes.ReserveData) storage reservesData,
    DataTypes.UserConfigurationMap memory userConfig,
    mapping(uint256 => address) storage reserves,
    uint256 reservesCount,
    address oracle
  )
    internal
    view
    returns (
      uint256,
      uint256,
      uint256,
      uint256,
      uint256
    )
  {
    CalculateUserAccountDataVars memory vars;

    if (userConfig.isEmpty()) {
      return (0, 0, 0, 0, uint256(-1));
    }
    for (vars.i = 0; vars.i < reservesCount; vars.i++) {
      if (!userConfig.isUsingAsCollateralOrBorrowing(vars.i)) {
        continue;
      }

      vars.currentReserveAddress = reserves[vars.i];
      DataTypes.ReserveData storage currentReserve = reservesData[vars.currentReserveAddress];

      (vars.ltv, vars.liquidationThreshold, , vars.decimals, ) = currentReserve
        .configuration
        .getParams();

      vars.tokenUnit = 10**vars.decimals;
      vars.reserveUnitPrice = IPriceOracleGetter(oracle).getAssetPrice(vars.currentReserveAddress);

      if (vars.liquidationThreshold != 0 && userConfig.isUsingAsCollateral(vars.i)) {
        vars.compoundedLiquidityBalance = IERC20(currentReserve.xTokenAddress).balanceOf(user);

        uint256 liquidityBalanceETH =
          vars.reserveUnitPrice.mul(vars.compoundedLiquidityBalance).div(vars.tokenUnit);

        vars.totalCollateralInETH = vars.totalCollateralInETH.add(liquidityBalanceETH);

        vars.avgLtv = vars.avgLtv.add(liquidityBalanceETH.mul(vars.ltv));
        vars.avgLiquidationThreshold = vars.avgLiquidationThreshold.add(
          liquidityBalanceETH.mul(vars.liquidationThreshold)
        );
      }

      if (userConfig.isBorrowing(vars.i)) {
        vars.compoundedBorrowBalance = IERC20(currentReserve.variableDebtTokenAddress).balanceOf(
          user
        );

        vars.totalDebtInETH = vars.totalDebtInETH.add(
          vars.reserveUnitPrice.mul(vars.compoundedBorrowBalance).div(vars.tokenUnit)
        );
      }
    }

    vars.avgLtv = vars.totalCollateralInETH > 0 ? vars.avgLtv.div(vars.totalCollateralInETH) : 0;
    vars.avgLiquidationThreshold = vars.totalCollateralInETH > 0
      ? vars.avgLiquidationThreshold.div(vars.totalCollateralInETH)
      : 0;

    vars.healthFactor = calculateHealthFactorFromBalances(
      vars.totalCollateralInETH,
      vars.totalDebtInETH,
      vars.avgLiquidationThreshold
    );
    return (
      vars.totalCollateralInETH,
      vars.totalDebtInETH,
      vars.avgLtv,
      vars.avgLiquidationThreshold,
      vars.healthFactor
    );
  }

  /**
   * @dev Calculates the health factor from the corresponding balances
   * @param totalCollateralInETH The total collateral in ETH
   * @param totalDebtInETH The total debt in ETH
   * @param liquidationThreshold The avg liquidation threshold
   * @return The health factor calculated from the balances provided
   **/
  function calculateHealthFactorFromBalances(
    uint256 totalCollateralInETH,
    uint256 totalDebtInETH,
    uint256 liquidationThreshold
  ) internal pure returns (uint256) {
    if (totalDebtInETH == 0) return uint256(-1);

    return (totalCollateralInETH.percentMul(liquidationThreshold)).wadDiv(totalDebtInETH);
  }

  /**
   * @dev Calculates the equivalent amount in ETH that an user can borrow, depending on the available collateral and the
   * average Loan To Value
   * @param totalCollateralInETH The total collateral in ETH
   * @param totalDebtInETH The total borrow balance
   * @param ltv The average loan to value
   * @return the amount available to borrow in ETH for the user
   **/

  function calculateAvailableBorrowsETH(
    uint256 totalCollateralInETH,
    uint256 totalDebtInETH,
    uint256 ltv
  ) internal pure returns (uint256) {
    uint256 availableBorrowsETH = totalCollateralInETH.percentMul(ltv);

    if (availableBorrowsETH < totalDebtInETH) {
      return 0;
    }

    availableBorrowsETH = availableBorrowsETH.sub(totalDebtInETH);
    return availableBorrowsETH;
  }

  struct AvailableCollateralToLiquidateLocalVars {
    uint256 userCompoundedBorrowBalance;
    uint256 liquidationBonus;
    uint256 collateralPrice;
    uint256 debtAssetPrice;
    uint256 maxAmountCollateralToLiquidate;
    uint256 debtAssetDecimals;
    uint256 collateralDecimals;
  }

  /**
    * @dev Calculates how much of a specific collateral can be liquidated, given
    * a certain amount of debt asset.
    * - This function needs to be called after all the checks to validate the liquidation have been performed,
    *   otherwise it might fail.
    * @param collateralReserve The data of the collateral reserve
    * @param debtReserve The data of the debt reserve
    * @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation
    * @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation
    * @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover
    * @param userCollateralBalance The collateral balance for the specific `collateralAsset` of the user being liquidated
    * @return collateralAmount: The maximum amount that is possible to liquidate given all the liquidation constraints
    *                           (user balance, close factor)
    *         debtAmountNeeded: The amount to repay with the liquidation
    **/
  function calculateAvailableCollateralToLiquidate(
    DataTypes.ReserveData storage collateralReserve,
    DataTypes.ReserveData storage debtReserve,
    address collateralAsset,
    address debtAsset,
    uint256 debtToCover,
    uint256 userCollateralBalance,
    address oracle
  ) internal view returns (uint256, uint256) {
      uint256 collateralAmount = 0;

      AvailableCollateralToLiquidateLocalVars memory vars;

      vars.collateralPrice = IPriceOracleGetter(oracle).getAssetPrice(
          collateralAsset
      );
      vars.debtAssetPrice = IPriceOracleGetter(oracle).getAssetPrice(
          debtAsset
      );

      (
          ,
          ,
          vars.liquidationBonus,
          vars.collateralDecimals,

      ) = collateralReserve.configuration.getParams();
      vars.debtAssetDecimals = debtReserve.configuration.getDecimals();

      // This is the maximum possible amount of the selected collateral that can be liquidated, given the
      // max amount of liquidatable debt
      vars.maxAmountCollateralToLiquidate = vars
          .debtAssetPrice
          .mul(debtToCover)
          .mul(10**vars.collateralDecimals)
          .percentMul(vars.liquidationBonus)
          .div(vars.collateralPrice.mul(10**vars.debtAssetDecimals));

      if (vars.maxAmountCollateralToLiquidate > userCollateralBalance) {
          collateralAmount = userCollateralBalance;
      } else {
          collateralAmount = vars.maxAmountCollateralToLiquidate;
      }
      return (
          collateralAmount,
          collateralAmount.percentDiv(vars.liquidationBonus)
      );
  }


}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import {IERC20} from './IERC20.sol';
import {DataTypes} from './DataTypes.sol';

/**
 * @title Helpers library
 * @author Lever
 */
library Helpers {
  /**
   * @dev Fetches the user current variable debt balances
   * @param user The user address
   * @param reserve The reserve data object
   * @return The variable debt balance
   **/
  function getUserCurrentDebt(address user, DataTypes.ReserveData storage reserve)
    internal
    view
    returns (uint256)
  {
    return IERC20(reserve.variableDebtTokenAddress).balanceOf(user);
  }

  function getUserCurrentDebtMemory(address user, DataTypes.ReserveData memory reserve)
    internal
    view
    returns (uint256)
  {
    return IERC20(reserve.variableDebtTokenAddress).balanceOf(user);
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

interface IChainlinkAggregator {
  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 timestamp);
  event NewRound(uint256 indexed roundId, address indexed startedBy);
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

interface ICreditDelegationToken {
  event BorrowAllowanceDelegated(
    address indexed fromUser,
    address indexed toUser,
    address asset,
    uint256 amount
  );

  /**
   * @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 0.6.12;

/**
 * @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: agpl-3.0
pragma solidity 0.6.12;

import {IERC20} from './IERC20.sol';

interface IERC20Detailed is IERC20 {
  function name() external view returns (string memory);

  function symbol() external view returns (string memory);

  function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

contract IERC20DetailedBytes {
  bytes32 public name;
  bytes32 public symbol;
  uint256 public decimals;
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import {IERC20} from './IERC20.sol';

interface IERC20WithPermit is IERC20 {
  function permit(
    address owner,
    address spender,
    uint256 value,
    uint256 deadline,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external;
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

interface IExtendedPriceAggregator {
  event AnswerUpdated(int256 indexed current, uint256 indexed roundId, uint256 timestamp);

  function getToken() external view returns (address);

  function getTokenType() external view returns (uint256);

  function getPlatformId() external view returns (uint256);

  function getSubTokens() external view returns (address[] memory);

  function latestAnswer() external view returns (int256);
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import {IMarginPoolAddressesProvider} from './IMarginPoolAddressesProvider.sol';
import {DataTypes} from './DataTypes.sol';

interface IMarginPool {
  /**
   * @dev Emitted on deposit()
   * @param reserve The address of the underlying asset of the reserve
   * @param user The address initiating the deposit
   * @param onBehalfOf The beneficiary of the deposit, receiving the xTokens
   * @param amount The amount deposited
   **/
  event Deposit(
    address indexed reserve,
    address indexed user,
    address indexed onBehalfOf,
    uint256 amount
  );

  /**
   * @dev Emitted on withdraw()
   * @param reserve The address of the underlyng asset being withdrawn
   * @param user The address initiating the withdrawal, owner of xTokens
   * @param to Address that will receive the underlying
   * @param amount The amount to be withdrawn
   **/
  event Withdraw(address indexed reserve, address indexed user, address indexed to, uint256 amount);

  /**
   * @dev Emitted on borrow() when debt needs to be opened
   * @param reserve The address of the underlying asset being borrowed
   * @param user The address of the user initiating the borrow(), receiving the funds on borrow()
   * @param onBehalfOf The address that will be getting the debt
   * @param amount The amount borrowed out
   * @param borrowRate The numeric rate at which the user has borrowed
   **/
  event Borrow(
    address indexed reserve,
    address indexed user,
    address indexed onBehalfOf,
    uint256 amount,
    uint256 borrowRate
  );

  /**
   * @dev Emitted on repay()
   * @param reserve The address of the underlying asset of the reserve
   * @param user The beneficiary of the repayment, getting his debt reduced
   * @param repayer The address of the user initiating the repay(), providing the funds
   * @param amount The amount repaid
   **/
  event Repay(
    address indexed reserve,
    address indexed user,
    address indexed repayer,
    uint256 amount
  );
  
    /**
   * @dev Emitted on swapTokensForTokens() swapTokensForClosePosition() swapWithAggregation() closeWithAggregation()
   * @param user The address initiating the swap
   * @param srcReserve The address of the underlying asset of the source reserve
   * @param dstReserve The address of the underlying asset of the destination reserve
   * @param srcAmount The amount of source reserve
   * @param dstAmount The amount of destination reserve
   **/
  event Swap(
    address indexed user,
    address indexed srcReserve,
    address indexed dstReserve,
    uint256 srcAmount,
    uint256 dstAmount
  );


  /**
   * @dev Emitted on setUserUseReserveAsCollateral()
   * @param reserve The address of the underlying asset of the reserve
   * @param user The address of the user enabling the usage as collateral
   **/
  event ReserveUsedAsCollateralEnabled(address indexed reserve, address indexed user);

  /**
   * @dev Emitted on setUserUseReserveAsCollateral()
   * @param reserve The address of the underlying asset of the reserve
   * @param user The address of the user enabling the usage as collateral
   **/
  event ReserveUsedAsCollateralDisabled(address indexed reserve, address indexed user);


  /**
   * @dev Emitted when the pause is triggered.
   */
  event Paused();

  /**
   * @dev Emitted when the pause is lifted.
   */
  event Unpaused();

  /**
    * @dev Emitted when a borrower is liquidated. This event is emitted by the MarginPool via
    * MarginPoolCollateral manager using a DELEGATECALL
    * This allows to have the events in the generated ABI for MarginPool.
    * @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation
    * @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation
    * @param user The address of the borrower getting liquidated
    * @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover
    * @param liquidatedCollateralAmount The amount of collateral received by the liiquidator
    * @param liquidator The address of the liquidator
    **/
  event LiquidationCall(
      address indexed collateralAsset,
      address indexed debtAsset,
      address indexed user,
      uint256 debtToCover,
      uint256 liquidatedCollateralAmount,
      address liquidator
  );

  /**
   * @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 MarginPool contract. The event is therefore replicated here so it
   * gets added to the MarginPool 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 xTokens.
   * - E.g. User deposits 100 USDC and gets in return 100 xUSDC
   * @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 xTokens, same as msg.sender if the user
   *   wants to receive them on his own wallet, or a different address if the beneficiary of xTokens
   *   is a different wallet
   **/
  function deposit(
    address asset,
    uint256 amount,
    address onBehalfOf
  ) external;

  /**
   * @dev Withdraws an `amount` of underlying asset from the reserve, burning the equivalent xTokens owned
   * E.g. User has 100 xUSDC, calls withdraw() and receives 100 USDC, burning the 100 xUSDC
   * @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 xToken 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 returns (uint256);

  /**
   * @dev Allows users to borrow a specific `amount` of the reserve underlying asset, provided that the borrower
   * already deposited enough collateral, or he was given enough allowance by a credit delegator on the
   * corresponding debt token ( VariableDebtToken)
   * - E.g. User borrows 100 USDC passing as `onBehalfOf` his own address, receiving the 100 USDC in his wallet
   *   and 100 variable debt tokens
   * @param asset The address of the underlying asset to borrow
   * @param amount The amount to be borrowed
   * @param onBehalfOf Address of the user who will receive the debt. 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
   **/
  function borrow(
    address asset,
    uint256 amount,
    address onBehalfOf
  ) external;

  /**
   * @notice Repays a borrowed `amount` on a specific reserve, burning the equivalent debt tokens owned
   * - E.g. User repays 100 USDC, burning 100 variable debt tokens of the `onBehalfOf` address
   * @param asset The address of the borrowed underlying asset previously borrowed
   * @param amount The amount to repay
   * - Send the value type(uint256).max in order to repay the whole debt for `asset` on the specific `debtMode`
   * @param onBehalfOf Address of the user who will get his debt reduced/removed. Should be the address of the
   * user calling the function if he wants to reduce/remove his own debt, or the address of any other
   * other borrower whose debt should be removed
   * @return The final amount repaid
   **/
  function repay(
    address asset,
    uint256 amount,
    address onBehalfOf
  ) external returns (uint256);

  function swapTokensForTokens(
    uint256 amountIn,
    uint256 amountOut,
    address[] calldata path,
    bool isExactIn,
    bool isUni
  ) external;

  function swapTokensForClosePosition(
        uint256 amountIn,
        uint256 amountOut,
        address[] calldata path,
        bool isExactIn,
        bool isUni
  ) external;

  /**
   * @dev Allows depositors to enable/disable a specific deposited asset as collateral
   * @param asset The address of the underlying asset deposited
   * @param useAsCollateral `true` if the user wants to use the deposit as collateral, `false` otherwise
   **/
  function setUserUseReserveAsCollateral(address asset, bool useAsCollateral) external;

  /**
   * @dev Function to liquidate a non-healthy position collateral-wise, with Health Factor below 1
   * - The caller (liquidator) covers `debtToCover` amount of debt of the user getting liquidated, and receives
   *   a proportionally amount of the `collateralAsset` plus a bonus to cover market risk
   * @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation
   * @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation
   * @param user The address of the borrower getting liquidated
   * @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover
   **/
  function liquidationCall(
    address collateralAsset,
    address debtAsset,
    address user,
    uint256 debtToCover
  ) external;

  /**
   * @dev Returns the user account data across all the reserves
   * @param user The address of the user
   * @return totalCollateralETH the total collateral in ETH of the user
   * @return totalDebtETH the total debt in ETH of the user
   * @return availableBorrowsETH the borrowing power left of the user
   * @return currentLiquidationThreshold the liquidation threshold of the user
   * @return ltv the loan to value of the user
   * @return healthFactor the current health factor of the user
   **/
  function getUserAccountData(address user)
    external
    view
    returns (
      uint256 totalCollateralETH,
      uint256 totalDebtETH,
      uint256 availableBorrowsETH,
      uint256 currentLiquidationThreshold,
      uint256 ltv,
      uint256 healthFactor
    );

  function initReserve(
    address reserve,
    address xTokenAddress,
    address variableDebtAddress,
    address interestRateStrategyAddress
  ) external;

  function setReserveInterestRateStrategyAddress(address reserve, address rateStrategyAddress)
    external;

  function setConfiguration(address reserve, uint256 configuration) external;

  /**
   * @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 getConfiguration(address asset)
    external
    view
    returns (DataTypes.ReserveConfigurationMap memory);

  /**
   * @dev Returns the configuration of the user across all the reserves
   * @param user The user address
   * @return The configuration of the user
   **/
  function getUserConfiguration(address user)
    external
    view
    returns (DataTypes.UserConfigurationMap 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 finalizeTransfer(
    address asset,
    address from,
    address to,
    uint256 amount,
    uint256 balanceFromAfter,
    uint256 balanceToBefore
  ) external;

  function getReservesList() external view returns (address[] memory);

  function getAddressesProvider() external view returns (IMarginPoolAddressesProvider);

  function setPause(bool val) external;

  function paused() external view returns (bool);
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

/**
 * @title MarginPoolAddressesProvider 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 Lever Governance
 * @author Lever
 **/
interface IMarginPoolAddressesProvider {
  event MarginPoolUpdated(address indexed newAddress);
  event ConfigurationAdminUpdated(address indexed newAddress);
  event EmergencyAdminUpdated(address indexed newAddress);
  event MarginPoolConfiguratorUpdated(address indexed newAddress);
  event MarginPoolCollateralManagerUpdated(address indexed newAddress);
  event PriceOracleUpdated(address indexed newAddress);
  event ProxyCreated(bytes32 id, address indexed newAddress);
  event AddressSet(bytes32 id, address indexed newAddress, bool hasProxy);
  event LeverTokenUpdated(address indexed newAddress);
  event TreasuryAddressUpdated(address indexed newAddress);
  event RewardsDistributionUpdated(address indexed newAddress);
  event OrderBookUpdated(address indexed newAddress);
  event SwapMinerUpdated(address indexed newAddress);


  function setAddress(bytes32 id, address newAddress) external;

  function setAddressAsProxy(bytes32 id, address impl) external;

  function getAddress(bytes32 id) external view returns (address);

  function getMarginPool() external view returns (address);

  function setMarginPoolImpl(address pool, address UniswapRouter,address SushiswapRouter, address weth) external;

  function getMarginPoolConfigurator() external view returns (address);

  function setMarginPoolConfiguratorImpl(address configurator) external;

  function getPoolAdmin() external view returns (address);

  function setPoolAdmin(address admin) external;

  function getEmergencyAdmin() external view returns (address);

  function setEmergencyAdmin(address admin) external;

  function getPriceOracle() external view returns (address);

  function setPriceOracle(address priceOracle) external;

  function getLeverToken() external view returns (address);

  function setLeverToken(address lever) external;

  function getTreasuryAddress() external view returns (address);

  function setTreasuryAddress(address treasuryAddress) external;

  function getRewardsDistribution() external view returns (address);

  function setRewardsDistribution(address rewardsDistribution) external;

  function getOrderBook() external view returns (address);

  function setOrderBookImpl(address addressProvider, address UniswapRouter, address weth) external;

  function getSwapMiner() external view returns (address);

  function setSwapMinerImpl(address _swapMiner, address UniswapRouter, address _uniswapLevPairToken, address LeverUsdOracle) external;
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import {Context} from './Context.sol';
import {IERC20} from './IERC20.sol';
import {IERC20Detailed} from './IERC20Detailed.sol';
import {SafeMath} from './SafeMath.sol';

/**
 * @title ERC20
 * @notice Basic ERC20 implementation
 * @author Lever, inspired by the Openzeppelin ERC20 implementation
 **/
contract IncentivizedERC20 is Context, IERC20, IERC20Detailed {
  using SafeMath for uint256;


  mapping(address => uint256) internal _balances;

  mapping(address => mapping(address => uint256)) private _allowances;
  uint256 internal _totalSupply;
  string private _name;
  string private _symbol;
  uint8 private _decimals;

  constructor(
    string memory name,
    string memory symbol,
    uint8 decimals
  ) public {
    _name = name;
    _symbol = symbol;
    _decimals = decimals;
  }

  /**
   * @return The name of the token
   **/
  function name() public view override returns (string memory) {
    return _name;
  }

  /**
   * @return The symbol of the token
   **/
  function symbol() public view override returns (string memory) {
    return _symbol;
  }

  /**
   * @return The decimals of the token
   **/
  function decimals() public view override returns (uint8) {
    return _decimals;
  }

  /**
   * @return The total supply of the token
   **/
  function totalSupply() public view virtual override returns (uint256) {
    return _totalSupply;
  }

  /**
   * @return The balance of the token
   **/
  function balanceOf(address account) public view virtual override returns (uint256) {
    return _balances[account];
  }

  /**
   * @dev Executes a transfer of tokens from _msgSender() to recipient
   * @param recipient The recipient of the tokens
   * @param amount The amount of tokens being transferred
   * @return `true` if the transfer succeeds, `false` otherwise
   **/
  function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
    _transfer(_msgSender(), recipient, amount);
    emit Transfer(_msgSender(), recipient, amount);
    return true;
  }

  /**
   * @dev Returns the allowance of spender on the tokens owned by owner
   * @param owner The owner of the tokens
   * @param spender The user allowed to spend the owner's tokens
   * @return The amount of owner's tokens spender is allowed to spend
   **/
  function allowance(address owner, address spender)
    public
    view
    virtual
    override
    returns (uint256)
  {
    return _allowances[owner][spender];
  }

  /**
   * @dev Allows `spender` to spend the tokens owned by _msgSender()
   * @param spender The user allowed to spend _msgSender() tokens
   * @return `true`
   **/
  function approve(address spender, uint256 amount) public virtual override returns (bool) {
    _approve(_msgSender(), spender, amount);
    return true;
  }

  /**
   * @dev Executes a transfer of token from sender to recipient, if _msgSender() is allowed to do so
   * @param sender The owner of the tokens
   * @param recipient The recipient of the tokens
   * @param amount The amount of tokens being transferred
   * @return `true` if the transfer succeeds, `false` otherwise
   **/
  function transferFrom(
    address sender,
    address recipient,
    uint256 amount
  ) public virtual override returns (bool) {
    _transfer(sender, recipient, amount);
    _approve(
      sender,
      _msgSender(),
      _allowances[sender][_msgSender()].sub(amount, 'ERC20: transfer amount exceeds allowance')
    );
    emit Transfer(sender, recipient, amount);
    return true;
  }

  /**
   * @dev Increases the allowance of spender to spend _msgSender() tokens
   * @param spender The user allowed to spend on behalf of _msgSender()
   * @param addedValue The amount being added to the allowance
   * @return `true`
   **/
  function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
    _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
    return true;
  }

  /**
   * @dev Decreases the allowance of spender to spend _msgSender() tokens
   * @param spender The user allowed to spend on behalf of _msgSender()
   * @param subtractedValue The amount being subtracted to the allowance
   * @return `true`
   **/
  function decreaseAllowance(address spender, uint256 subtractedValue)
    public
    virtual
    returns (bool)
  {
    _approve(
      _msgSender(),
      spender,
      _allowances[_msgSender()][spender].sub(
        subtractedValue,
        'ERC20: decreased allowance below zero'
      )
    );
    return true;
  }

  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 oldSenderBalance = _balances[sender];
    _balances[sender] = oldSenderBalance.sub(amount, 'ERC20: transfer amount exceeds balance');
    _balances[recipient] = _balances[recipient].add(amount);

  }

  function _mint(address account, uint256 amount) internal virtual {
    require(account != address(0), 'ERC20: mint to the zero address');

    _beforeTokenTransfer(address(0), account, amount);

    uint256 oldTotalSupply = _totalSupply;
    _totalSupply = oldTotalSupply.add(amount);

    uint256 oldAccountBalance = _balances[account];
    _balances[account] = oldAccountBalance.add(amount);
  }

  function _burn(address account, uint256 amount) internal virtual {
    require(account != address(0), 'ERC20: burn from the zero address');

    _beforeTokenTransfer(account, address(0), amount);

    uint256 oldTotalSupply = _totalSupply;
    _totalSupply = oldTotalSupply.sub(amount);

    uint256 oldAccountBalance = _balances[account];
    _balances[account] = oldAccountBalance.sub(amount, 'ERC20: burn amount exceeds balance');

  }

  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);
  }

  function _setName(string memory newName) internal {
    _name = newName;
  }

  function _setSymbol(string memory newSymbol) internal {
    _symbol = newSymbol;
  }

  function _setDecimals(uint8 newDecimals) internal {
    _decimals = newDecimals;
  }

  function _beforeTokenTransfer(
    address from,
    address to,
    uint256 amount
  ) internal virtual {}
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity >=0.4.24 <0.7.0;

/**
 * @title Initializable
 *
 * @dev Helper contract to support initializer functions. To use it, replace
 * the constructor with a function that has the `initializer` modifier.
 * WARNING: Unlike constructors, initializer functions must be manually
 * invoked. This applies both to deploying an Initializable contract, as well
 * as extending an Initializable contract via inheritance.
 * WARNING: When used with inheritance, manual care must be taken to not invoke
 * a parent initializer twice, or ensure that all initializers are idempotent,
 * because this is not dealt with automatically as with constructors.
 */
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 use in the initializer function of a contract.
   */
  modifier initializer() {
    require(
      initializing || isConstructor() || !initialized,
      'Contract instance has already been initialized'
    );

    bool isTopLevelCall = !initializing;
    if (isTopLevelCall) {
      initializing = true;
      initialized = true;
    }

    _;

    if (isTopLevelCall) {
      initializing = false;
    }
  }

  /// @dev Returns true if and only if the function is running in the constructor
  function isConstructor() private view returns (bool) {
    // extcodesize checks the size of the code stored in an address, and
    // address returns the current address. Since the code is still not
    // deployed when running a constructor, any checks on its code size will
    // yield zero, making it an effective way to detect if a contract is
    // under construction or not.
    uint256 cs;
    //solium-disable-next-line
    assembly {
      cs := extcodesize(address())
    }
    return cs == 0;
  }

  // Reserved storage space to allow for layout changes in the future.
  uint256[50] private ______gap;
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import './BaseAdminUpgradeabilityProxy.sol';
import './InitializableUpgradeabilityProxy.sol';

/**
 * @title InitializableAdminUpgradeabilityProxy
 * @dev Extends from BaseAdminUpgradeabilityProxy with an initializer for
 * initializing the implementation, admin, and init data.
 */
contract InitializableAdminUpgradeabilityProxy is
  BaseAdminUpgradeabilityProxy,
  InitializableUpgradeabilityProxy
{
  /**
   * Contract initializer.
   * @param logic address of the initial implementation.
   * @param admin Address of the proxy administrator.
   * @param data Data to send as msg.data to the implementation to initialize the proxied contract.
   * It should include the signature and the parameters of the function to be called, as described in
   * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
   * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped.
   */
  function initialize(
    address logic,
    address admin,
    bytes memory data
  ) public payable {
    require(_implementation() == address(0),"_implementation() != address(0)");
    InitializableUpgradeabilityProxy.initialize(logic, data);
    assert(ADMIN_SLOT == bytes32(uint256(keccak256('eip1967.proxy.admin')) - 1));
    _setAdmin(admin);
  }

  /**
   * @dev Only fall back when the sender is not the admin.
   */
  function _willFallback() internal override(BaseAdminUpgradeabilityProxy, Proxy) {
    BaseAdminUpgradeabilityProxy._willFallback();
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import './BaseImmutableAdminUpgradeabilityProxy.sol';
import './InitializableUpgradeabilityProxy.sol';

/**
 * @title InitializableAdminUpgradeabilityProxy
 * @dev Extends BaseAdminUpgradeabilityProxy with an initializer function
 */
contract InitializableImmutableAdminUpgradeabilityProxy is
  BaseImmutableAdminUpgradeabilityProxy,
  InitializableUpgradeabilityProxy
{
  constructor(address admin) public BaseImmutableAdminUpgradeabilityProxy(admin) {}

  /**
   * @dev Only fall back when the sender is not the admin.
   */
  function _willFallback() internal override(BaseImmutableAdminUpgradeabilityProxy, Proxy) {
    BaseImmutableAdminUpgradeabilityProxy._willFallback();
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import './BaseUpgradeabilityProxy.sol';

/**
 * @title InitializableUpgradeabilityProxy
 * @dev Extends BaseUpgradeabilityProxy with an initializer for initializing
 * implementation and init data.
 */
contract InitializableUpgradeabilityProxy is BaseUpgradeabilityProxy {
  /**
   * @dev Contract initializer.
   * @param _logic Address of the initial implementation.
   * @param _data Data to send as msg.data to the implementation to initialize the proxied contract.
   * It should include the signature and the parameters of the function to be called, as described in
   * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
   * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped.
   */
  function initialize(address _logic, bytes memory _data) public payable {
    require(_implementation() == address(0),"_implementation error!");
    assert(IMPLEMENTATION_SLOT == bytes32(uint256(keccak256('eip1967.proxy.implementation')) - 1));
    _setImplementation(_logic);
    if (_data.length > 0) {
      (bool success, ) = _logic.delegatecall(_data);
      require(success,"_logic.delegatecall error!");
    }
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

/************
@title IPriceOracle interface
@notice Interface for the Lever price oracle.*/
interface IPriceOracle {
  /***********
    @dev returns the asset price in ETH
     */
  function getAssetPrice(address asset) external view returns (uint256);

  /***********
    @dev sets the asset price, in wei
     */
  function setAssetPrice(address asset, uint256 price) external;
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

/**
 * @title IPriceOracleGetter interface
 * @notice Interface for the Lever price oracle.
 **/

interface IPriceOracleGetter {
  /**
   * @dev returns the asset price in ETH
   * @param asset the address of the asset
   * @return the ETH price of the asset
   **/
  function getAssetPrice(address asset) external view returns (uint256);
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

/**
 * @title IReserveInterestRateStrategyInterface interface
 * @dev Interface for the calculation of the interest rates
 * @author Lever
 */
interface IReserveInterestRateStrategy {
  function baseVariableBorrowRate() external view returns (uint256);

  function getMaxVariableBorrowRate() external view returns (uint256);

  function calculateInterestRates(
    uint256 utilizationRate,
    uint256 totalVariableDebt,
    uint256 reserveFactor
  )
    external
    view
    returns (
      uint256 liquidityRate,
      uint256 variableBorrowRate
    );
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

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: agpl-3.0
pragma solidity ^0.6.12;

/**
 * @title ITokenConfiguration
 * @author Lever
 * @dev Common interface between xTokens and debt tokens to fetch the
 * token configuration
 **/
interface ITokenConfiguration {
  function UNDERLYING_ASSET_ADDRESS() external view returns (address);

  function POOL() external view returns (address);
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity >=0.6.2;

interface IUniswapV2Router01 {
  function factory() external pure returns (address);

  function WETH() external pure returns (address);

  function addLiquidity(
    address tokenA,
    address tokenB,
    uint256 amountADesired,
    uint256 amountBDesired,
    uint256 amountAMin,
    uint256 amountBMin,
    address to,
    uint256 deadline
  )
    external
    returns (
      uint256 amountA,
      uint256 amountB,
      uint256 liquidity
    );

  function addLiquidityETH(
    address token,
    uint256 amountTokenDesired,
    uint256 amountTokenMin,
    uint256 amountETHMin,
    address to,
    uint256 deadline
  )
    external
    payable
    returns (
      uint256 amountToken,
      uint256 amountETH,
      uint256 liquidity
    );

  function removeLiquidity(
    address tokenA,
    address tokenB,
    uint256 liquidity,
    uint256 amountAMin,
    uint256 amountBMin,
    address to,
    uint256 deadline
  ) external returns (uint256 amountA, uint256 amountB);

  function removeLiquidityETH(
    address token,
    uint256 liquidity,
    uint256 amountTokenMin,
    uint256 amountETHMin,
    address to,
    uint256 deadline
  ) external returns (uint256 amountToken, uint256 amountETH);

  function removeLiquidityWithPermit(
    address tokenA,
    address tokenB,
    uint256 liquidity,
    uint256 amountAMin,
    uint256 amountBMin,
    address to,
    uint256 deadline,
    bool approveMax,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external returns (uint256 amountA, uint256 amountB);

  function removeLiquidityETHWithPermit(
    address token,
    uint256 liquidity,
    uint256 amountTokenMin,
    uint256 amountETHMin,
    address to,
    uint256 deadline,
    bool approveMax,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external returns (uint256 amountToken, uint256 amountETH);

  function swapExactTokensForTokens(
    uint256 amountIn,
    uint256 amountOutMin,
    address[] calldata path,
    address to,
    uint256 deadline
  ) external returns (uint256[] memory amounts);

  function swapTokensForExactTokens(
    uint256 amountOut,
    uint256 amountInMax,
    address[] calldata path,
    address to,
    uint256 deadline
  ) external returns (uint256[] memory amounts);

  function swapExactETHForTokens(
    uint256 amountOutMin,
    address[] calldata path,
    address to,
    uint256 deadline
  ) external payable returns (uint256[] memory amounts);

  function swapTokensForExactETH(
    uint256 amountOut,
    uint256 amountInMax,
    address[] calldata path,
    address to,
    uint256 deadline
  ) external returns (uint256[] memory amounts);

  function swapExactTokensForETH(
    uint256 amountIn,
    uint256 amountOutMin,
    address[] calldata path,
    address to,
    uint256 deadline
  ) external returns (uint256[] memory amounts);

  function swapETHForExactTokens(
    uint256 amountOut,
    address[] calldata path,
    address to,
    uint256 deadline
  ) external payable returns (uint256[] memory amounts);

  function quote(
    uint256 amountA,
    uint256 reserveA,
    uint256 reserveB
  ) external pure returns (uint256 amountB);

  function getAmountOut(
    uint256 amountIn,
    uint256 reserveIn,
    uint256 reserveOut
  ) external pure returns (uint256 amountOut);

  function getAmountIn(
    uint256 amountOut,
    uint256 reserveIn,
    uint256 reserveOut
  ) external pure returns (uint256 amountIn);

  function getAmountsOut(uint256 amountIn, address[] calldata path)
    external
    view
    returns (uint256[] memory amounts);

  function getAmountsIn(uint256 amountOut, address[] calldata path)
    external
    view
    returns (uint256[] memory amounts);
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity >=0.6.2;

import './IUniswapV2Router01.sol';

interface IUniswapV2Router02 is IUniswapV2Router01 {
  function removeLiquidityETHSupportingFeeOnTransferTokens(
    address token,
    uint256 liquidity,
    uint256 amountTokenMin,
    uint256 amountETHMin,
    address to,
    uint256 deadline
  ) external returns (uint256 amountETH);

  function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
    address token,
    uint256 liquidity,
    uint256 amountTokenMin,
    uint256 amountETHMin,
    address to,
    uint256 deadline,
    bool approveMax,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external returns (uint256 amountETH);

  function swapExactTokensForTokensSupportingFeeOnTransferTokens(
    uint256 amountIn,
    uint256 amountOutMin,
    address[] calldata path,
    address to,
    uint256 deadline
  ) external;

  function swapExactETHForTokensSupportingFeeOnTransferTokens(
    uint256 amountOutMin,
    address[] calldata path,
    address to,
    uint256 deadline
  ) external payable;

  function swapExactTokensForETHSupportingFeeOnTransferTokens(
    uint256 amountIn,
    uint256 amountOutMin,
    address[] calldata path,
    address to,
    uint256 deadline
  ) external;
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import {IScaledBalanceToken} from './IScaledBalanceToken.sol';

/**
 * @title IVariableDebtToken
 * @author Lever
 * @notice Defines the basic interface for a variable debt token.
 **/
interface IVariableDebtToken is IScaledBalanceToken {
  /**
   * @dev Emitted after the mint action
   * @param from The address performing the mint
   * @param onBehalfOf The address of the user on which behalf minting has been performed
   * @param value The amount to be minted
   * @param index The last index of the reserve
   **/
  event Mint(address indexed from, address indexed onBehalfOf, uint256 value, uint256 index);

  /**
   * @dev Mints debt token to the `onBehalfOf` address
   * @param user The address receiving the borrowed underlying, being the delegatee in case
   * of credit delegate, or same as `onBehalfOf` otherwise
   * @param onBehalfOf The address receiving the debt tokens
   * @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;
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

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 0.6.12;

interface IWETHGateway {
  function depositETH(address onBehalfOf) external payable;

  function withdrawETH(uint256 amount, address onBehalfOf) external;

  function borrowETH(
    uint256 amount
  ) external;
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import {IERC20} from './IERC20.sol';
import {IScaledBalanceToken} from './IScaledBalanceToken.sol';

interface IXToken is IERC20, IScaledBalanceToken {
  /**
   * @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` xTokens 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 xTokens are burned
   * @param from The owner of the xTokens, 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 xTokens from `user` and sends the equivalent amount of underlying to `receiverOfUnderlying`
   * @param user The owner of the xTokens, 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 xTokens 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 xTokens in the event of a borrow being liquidated, in case the liquidators reclaims the xToken
   * @param from The address getting liquidated, current owner of the xTokens
   * @param to The recipient
   * @param value The amount of tokens getting transferred
   **/
  function transferOnLiquidation(
    address from,
    address to,
    uint256 value
  ) external;

  /**
   * @dev Transfers the underlying asset to `target`. Used by the MarginPool to transfer
   * assets in borrow(), withdraw() and flashLoan()
   * @param user The recipient of the xTokens
   * @param amount The amount getting transferred
   * @return The amount transferred
   **/
  function transferUnderlyingTo(address user, uint256 amount) external returns (uint256);
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import {Ownable} from './Ownable.sol';
import {IERC20} from './IERC20.sol';

import {IPriceOracleGetter} from './IPriceOracleGetter.sol';
import {IChainlinkAggregator} from './IChainlinkAggregator.sol';
import {SafeERC20} from './SafeERC20.sol';

/// @title LeverOracle
/// @author Lever
/// @notice Proxy smart contract to get the price of an asset from a price source, with Chainlink Aggregator
///         smart contracts as primary option
/// - If the returned price by a Chainlink aggregator is <= 0, the call is forwarded to a fallbackOracle
/// - Owned by the Lever governance system, allowed to add sources for assets, replace them
///   and change the fallbackOracle
contract LeverOracle is IPriceOracleGetter, Ownable {
  using SafeERC20 for IERC20;

  event WethSet(address indexed weth);
  event AssetSourceUpdated(address indexed asset, address indexed source);
  event FallbackOracleUpdated(address indexed fallbackOracle);

  mapping(address => IChainlinkAggregator) private assetsSources;
  IPriceOracleGetter private _fallbackOracle;
  address public immutable WETH;

  /// @notice Constructor
  /// @param assets The addresses of the assets
  /// @param sources The address of the source of each asset
  /// @param fallbackOracle The address of the fallback oracle to use if the data of an
  ///        aggregator is not consistent
  constructor(
    address[] memory assets,
    address[] memory sources,
    address fallbackOracle,
    address weth
  ) public {
    _setFallbackOracle(fallbackOracle);
    _setAssetsSources(assets, sources);
    WETH = weth;
    emit WethSet(weth);
  }

  /// @notice External function called by the Lever governance to set or replace sources of assets
  /// @param assets The addresses of the assets
  /// @param sources The address of the source of each asset
  function setAssetSources(address[] calldata assets, address[] calldata sources)
    external
    onlyOwner
  {
    _setAssetsSources(assets, sources);
  }

  /// @notice Sets the fallbackOracle
  /// - Callable only by the Lever governance
  /// @param fallbackOracle The address of the fallbackOracle
  function setFallbackOracle(address fallbackOracle) external onlyOwner {
    _setFallbackOracle(fallbackOracle);
  }

  /// @notice Internal function to set the sources for each asset
  /// @param assets The addresses of the assets
  /// @param sources The address of the source of each asset
  function _setAssetsSources(address[] memory assets, address[] memory sources) internal {
    require(assets.length == sources.length, 'INCONSISTENT_PARAMS_LENGTH');
    for (uint256 i = 0; i < assets.length; i++) {
      assetsSources[assets[i]] = IChainlinkAggregator(sources[i]);
      emit AssetSourceUpdated(assets[i], sources[i]);
    }
  }

  /// @notice Internal function to set the fallbackOracle
  /// @param fallbackOracle The address of the fallbackOracle
  function _setFallbackOracle(address fallbackOracle) internal {
    _fallbackOracle = IPriceOracleGetter(fallbackOracle);
    emit FallbackOracleUpdated(fallbackOracle);
  }

  /// @notice Gets an asset price by address
  /// @param asset The asset address
  function getAssetPrice(address asset) public view override returns (uint256) {
    IChainlinkAggregator source = assetsSources[asset];

    if (asset == WETH) {
      return 1 ether;
    } else if (address(source) == address(0)) {
      return _fallbackOracle.getAssetPrice(asset);
    } else {
      int256 price = IChainlinkAggregator(source).latestAnswer();
      if (price > 0) {
        return uint256(price);
      } else {
        return _fallbackOracle.getAssetPrice(asset);
      }
    }
  }

  /// @notice Gets a list of prices from a list of assets addresses
  /// @param assets The list of assets addresses
  function getAssetsPrices(address[] calldata assets) external view returns (uint256[] memory) {
    uint256[] memory prices = new uint256[](assets.length);
    for (uint256 i = 0; i < assets.length; i++) {
      prices[i] = getAssetPrice(assets[i]);
    }
    return prices;
  }

  /// @notice Gets the address of the source for an asset address
  /// @param asset The address of the asset
  /// @return address The address of the source
  function getSourceOfAsset(address asset) external view returns (address) {
    return address(assetsSources[asset]);
  }

  /// @notice Gets the address of the fallback oracle
  /// @return address The addres of the fallback oracle
  function getFallbackOracle() external view returns (address) {
    return address(_fallbackOracle);
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import {SafeMath} from "./SafeMath.sol";
import {IERC20} from "./IERC20.sol";
import {SafeERC20} from "./SafeERC20.sol";
import {Address} from "./Address.sol";
import {IMarginPoolAddressesProvider} from "./IMarginPoolAddressesProvider.sol";
import {IXToken} from "./IXToken.sol";
import {IVariableDebtToken} from "./IVariableDebtToken.sol";
import {IPriceOracleGetter} from "./IPriceOracleGetter.sol";
import {IMarginPool} from "./IMarginPool.sol";
import {VersionedInitializable} from "./VersionedInitializable.sol";
import {Helpers} from "./Helpers.sol";
import {Errors} from "./Errors.sol";
import {WadRayMath} from "./WadRayMath.sol";
import {PercentageMath} from "./PercentageMath.sol";
import {ReserveLogic} from "./ReserveLogic.sol";
import {GenericLogic} from "./GenericLogic.sol";
import {ValidationLogic} from "./ValidationLogic.sol";
import {ReserveConfiguration} from "./ReserveConfiguration.sol";
import {UserConfiguration} from "./UserConfiguration.sol";
import {DataTypes} from "./DataTypes.sol";
import {MarginPoolStorage} from "./MarginPoolStorage.sol";
import {IUniswapV2Router02} from "./IUniswapV2Router02.sol";

interface ISwapMining {
    function swapMint(
        address account,
        address input,
        address output,
        uint256 amount
    ) external returns (bool);
}

/**
 * @title MarginPool contract
 * @dev Main point of interaction with an Lever protocol's market
 * - Users can:
 *   # Deposit
 *   # Withdraw
 *   # Borrow
 *   # Repay
 *   # Liquidate positions
 * - To be covered by a proxy contract, owned by the MarginPoolAddressesProvider of the specific market
 * - All admin functions are callable by the MarginPoolConfigurator contract defined also in the
 *   MarginPoolAddressesProvider
 * @author Lever
 **/
contract MarginPool is VersionedInitializable, IMarginPool, MarginPoolStorage {
    using SafeMath for uint256;
    using WadRayMath for uint256;
    using PercentageMath for uint256;
    using SafeERC20 for IERC20;

    //main configuration parameters
    uint256 public constant MAX_NUMBER_RESERVES = 128;
    uint256 public constant MARGINPOOL_REVISION = 0x1;
    IUniswapV2Router02 public uniswaper;
    IUniswapV2Router02 public sushiSwaper;
    address public wethAddress;
    address public constant inchor = 0x11111112542D85B3EF69AE05771c2dCCff4fAa26;

    modifier whenNotPaused() {
        _whenNotPaused();
        _;
    }

    modifier onlyMarginPoolConfigurator() {
        _onlyMarginPoolConfigurator();
        _;
    }

    function _whenNotPaused() internal view {
        require(!_paused, Errors.MP_IS_PAUSED);
    }

    function _onlyMarginPoolConfigurator() internal view {
        require(
            _addressesProvider.getMarginPoolConfigurator() == msg.sender,
            Errors.MP_CALLER_NOT_MARGIN_POOL_CONFIGURATOR
        );
    }

    function getRevision() internal pure override returns (uint256) {
        return MARGINPOOL_REVISION;
    }

    /**
     * @dev Function is invoked by the proxy contract when the MarginPool contract is added to the
     * MarginPoolAddressesProvider of the market.
     * - Caching the address of the MarginPoolAddressesProvider in order to reduce gas consumption
     *   on subsequent operations
     * @param provider The address of the MarginPoolAddressesProvider
     **/
    function initialize(
        IMarginPoolAddressesProvider provider,
        IUniswapV2Router02 _uniswaper,
        IUniswapV2Router02 _sushiSwaper,
        address _weth
    ) public initializer {
        _addressesProvider = provider;
        uniswaper = _uniswaper;
        sushiSwaper = _sushiSwaper;
        wethAddress = _weth;
    }

    /**
     * @dev Deposits an `amount` of underlying asset into the reserve, receiving in return overlying xTokens.
     * - E.g. User deposits 100 USDC and gets in return 100 xUSDC
     * @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 xTokens, same as msg.sender if the user
     *   wants to receive them on his own wallet, or a different address if the beneficiary of xTokens
     *   is a different wallet
     **/
    function deposit(
        address asset,
        uint256 amount,
        address onBehalfOf
    ) external override whenNotPaused {
        DataTypes.ReserveData storage reserve = _reserves[asset];

        ValidationLogic.validateDeposit(reserve, amount);

        address xToken = reserve.xTokenAddress;

        reserve.updateState();
        reserve.updateInterestRates(asset, xToken, amount, 0);

        IERC20(asset).safeTransferFrom(msg.sender, xToken, amount);
        _depositLogic(asset, amount, onBehalfOf, xToken, reserve);
    }

    function reDeposit(
        address asset,
        uint256 amount,
        address onBehalfOf
    ) internal whenNotPaused {
        DataTypes.ReserveData storage reserve = _reserves[asset];

        ValidationLogic.validateDeposit(reserve, amount);

        address xToken = reserve.xTokenAddress;

        reserve.updateState();
        reserve.updateInterestRates(asset, xToken, amount, 0);

        IERC20(asset).safeTransfer(xToken, amount);
        _depositLogic(asset, amount, onBehalfOf, xToken, reserve);
    }

    function _depositLogic(
        address asset,
        uint256 amount,
        address onBehalfOf,
        address xToken,
        DataTypes.ReserveData storage reserve
    ) internal {
        uint256 variableDebt = Helpers.getUserCurrentDebt(onBehalfOf, reserve);
        if (variableDebt > 0) {
            uint256 paybackAmount = variableDebt;

            if (amount < paybackAmount) {
                paybackAmount = amount;
            }

            IVariableDebtToken(reserve.variableDebtTokenAddress).burn(
                onBehalfOf,
                paybackAmount,
                reserve.variableBorrowIndex
            );

            emit Repay(asset, onBehalfOf, msg.sender, paybackAmount);

            if (variableDebt == paybackAmount) {
                _usersConfig[onBehalfOf].setBorrowing(reserve.id, false);
            }

            if (amount > paybackAmount) {
                bool isFirstDeposit =
                    IXToken(xToken).mint(
                        onBehalfOf,
                        amount.sub(paybackAmount),
                        reserve.liquidityIndex
                    );

                if (isFirstDeposit) {
                    _usersConfig[onBehalfOf].setUsingAsCollateral(
                        reserve.id,
                        true
                    );
                    emit ReserveUsedAsCollateralEnabled(asset, onBehalfOf);
                }

                emit Deposit(
                    asset,
                    msg.sender,
                    onBehalfOf,
                    amount.sub(paybackAmount)
                );
            }
        } else {
            bool isFirstDeposit =
                IXToken(xToken).mint(
                    onBehalfOf,
                    amount,
                    reserve.liquidityIndex
                );

            if (isFirstDeposit) {
                _usersConfig[onBehalfOf].setUsingAsCollateral(reserve.id, true);
                emit ReserveUsedAsCollateralEnabled(asset, onBehalfOf);
            }

            emit Deposit(asset, msg.sender, onBehalfOf, amount);
        }
    }

    /**
     * @dev Withdraws an `amount` of underlying asset from the reserve, burning the equivalent xTokens owned
     * E.g. User has 100 xUSDC, calls withdraw() and receives 100 USDC, burning the 100 xUSDC
     * @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 xToken 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 whenNotPaused returns (uint256) {
        DataTypes.ReserveData storage reserve = _reserves[asset];

        address xToken = reserve.xTokenAddress;

        uint256 userBalance = IXToken(xToken).balanceOf(msg.sender);

        uint256 amountToWithdraw = amount;

        if (amount == type(uint256).max) {
            amountToWithdraw = userBalance;
        }

        ValidationLogic.validateWithdraw(
            asset,
            amountToWithdraw,
            userBalance,
            _reserves,
            _usersConfig[msg.sender],
            _reservesList,
            _reservesCount,
            _addressesProvider.getPriceOracle()
        );

        reserve.updateState();

        reserve.updateInterestRates(asset, xToken, 0, amountToWithdraw);

        if (amountToWithdraw == userBalance) {
            _usersConfig[msg.sender].setUsingAsCollateral(reserve.id, false);
            emit ReserveUsedAsCollateralDisabled(asset, msg.sender);
        }

        IXToken(xToken).burn(
            msg.sender,
            to,
            amountToWithdraw,
            reserve.liquidityIndex
        );

        emit Withdraw(asset, msg.sender, to, amountToWithdraw);

        return amountToWithdraw;
    }

    /**
     * @dev Allows users to borrow a specific `amount` of the reserve underlying asset, provided that the borrower
     * already deposited enough collateral, or he was given enough allowance by a credit delegator on the
     * corresponding debt token ( VariableDebtToken)
     * - E.g. User borrows 100 USDC passing as `onBehalfOf` his own address, receiving the 100 USDC in his wallet
     *   and 100 variable debt tokens
     * @param asset The address of the underlying asset to borrow
     * @param amount The amount to be borrowed
     * @param onBehalfOf Address of the user who will receive the debt. 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
     **/
    function borrow(
        address asset,
        uint256 amount,
        address onBehalfOf
    ) external override whenNotPaused {
        DataTypes.ReserveData storage reserve = _reserves[asset];

        _executeBorrow(
            ExecuteBorrowParams(
                asset,
                msg.sender,
                onBehalfOf,
                amount,
                reserve.xTokenAddress,
                true
            )
        );
    }

    function swapTokensForTokens(
        uint256 amountIn,
        uint256 amountOut,
        address[] calldata path,
        bool isExactIn,
        bool isUni
    ) external override whenNotPaused {
        _beforeSwap(path[0], amountIn);

        IUniswapV2Router02 swaper = isUni ? uniswaper : sushiSwaper;
        // Approves the transfer for the swap. Approves for 0 first to comply with tokens that implement the anti frontrunning approval fix.
        IERC20(path[0]).safeApprove(address(swaper), 0);
        IERC20(path[0]).safeApprove(address(swaper), amountIn);

        uint256[] memory awards;
        if (isExactIn) {
            awards = swaper.swapExactTokensForTokens(
                amountIn,
                amountOut,
                path,
                address(this),
                block.timestamp
            );
        } else {
            awards = swaper.swapTokensForExactTokens(
                amountOut,
                amountIn,
                path,
                address(this),
                block.timestamp
            );
        }

        reDeposit(path[path.length - 1], awards[awards.length - 1], msg.sender);

        if (amountIn > awards[0]) {
            reDeposit(path[0], amountIn.sub(awards[0]), msg.sender);
        }

        ValidationLogic.validateSwap(
            msg.sender,
            _reserves,
            _usersConfig[msg.sender],
            _reservesList,
            _reservesCount,
            _addressesProvider.getPriceOracle()
        );
        ISwapMining(_addressesProvider.getSwapMiner()).swapMint(
            msg.sender,
            path[0],
            path[path.length - 1],
            awards[awards.length - 1]
        );
        
        emit Swap(
            msg.sender,
            path[0],
            path[path.length - 1],
            awards[0],
            awards[awards.length - 1]
        );
    }

    function swapTokensForClosePosition(
        uint256 amountIn,
        uint256 amountOut,
        address[] calldata path,
        bool isExactIn,
        bool isUni
    ) external override whenNotPaused {
        _beforeClose(path[0], amountIn);

        IUniswapV2Router02 swaper = isUni ? uniswaper : sushiSwaper;

        // Approves the transfer for the swap. Approves for 0 first to comply with tokens that implement the anti frontrunning approval fix.
        IERC20(path[0]).safeApprove(address(swaper), 0);
        IERC20(path[0]).safeApprove(address(swaper), amountIn);

        uint256[] memory awards;
        if (isExactIn) {
            awards = swaper.swapExactTokensForTokens(
                amountIn,
                amountOut,
                path,
                address(this),
                block.timestamp
            );
        } else {
            awards = swaper.swapTokensForExactTokens(
                amountOut,
                amountIn,
                path,
                address(this),
                block.timestamp
            );
        }

        reDeposit(path[path.length - 1], awards[awards.length - 1], msg.sender);

        if (amountIn > awards[0]) {
            reDeposit(path[0], amountIn.sub(awards[0]), msg.sender);
        }

        ValidationLogic.validateSwap(
            msg.sender,
            _reserves,
            _usersConfig[msg.sender],
            _reservesList,
            _reservesCount,
            _addressesProvider.getPriceOracle()
        );

        ISwapMining(_addressesProvider.getSwapMiner()).swapMint(
            msg.sender,
            path[0],
            path[path.length - 1],
            awards[awards.length - 1]
        );
        emit Swap(
            msg.sender,
            path[0],
            path[path.length - 1],
            awards[0],
            awards[awards.length - 1]
        );
    }

    function swapWithAggregation(
        address _reserve,
        uint256 amount,
        address _reserveTo,
        bytes memory codes,
        uint256 gas,
        uint8 swapType
    ) external {
        _beforeSwap(_reserve, amount);

        IERC20(_reserve).safeApprove(inchor, 0);
        IERC20(_reserve).safeApprove(inchor, amount);

        (bool success, bytes memory result) = inchor.call{gas: gas}(codes);

        require(success, "swap failed");

        uint256 award;

        if (swapType == 1) {
            award = abi.decode(result, (uint256));
        }

        if (swapType == 2) {
            (award, ) = abi.decode(result, (uint256, uint256));
        }

        if (swapType == 3) {
            (award, , ) = abi.decode(result, (uint256, uint256, uint256));
        }

        reDeposit(_reserveTo, award, msg.sender);

        ValidationLogic.validateSwap(
            msg.sender,
            _reserves,
            _usersConfig[msg.sender],
            _reservesList,
            _reservesCount,
            _addressesProvider.getPriceOracle()
        );

        ISwapMining(_addressesProvider.getSwapMiner()).swapMint(
            msg.sender,
            _reserve,
            _reserveTo,
            award
        );
        emit Swap(msg.sender, _reserve, _reserveTo, amount, award);
    }

    function closeWithAggregation(
        address _reserve,
        uint256 amountIn,
        address _reserveTo,
        bytes memory codes,
        uint256 gas,
        uint8 swapType
    ) external {
        _beforeClose(_reserve, amountIn);

        IERC20(_reserve).safeApprove(inchor, 0);
        IERC20(_reserve).safeApprove(inchor, amountIn);

        (bool success, bytes memory result) = inchor.call{gas: gas}(codes);

        require(success, "swap failed");

        uint256 award;

        if (swapType == 1) {
            award = abi.decode(result, (uint256));
        }

        if (swapType == 2) {
            (award, ) = abi.decode(result, (uint256, uint256));
        }

        if (swapType == 3) {
            (award, , ) = abi.decode(result, (uint256, uint256, uint256));
        }

        reDeposit(_reserveTo, award, msg.sender);

        ValidationLogic.validateSwap(
            msg.sender,
            _reserves,
            _usersConfig[msg.sender],
            _reservesList,
            _reservesCount,
            _addressesProvider.getPriceOracle()
        );

        ISwapMining(_addressesProvider.getSwapMiner()).swapMint(
            msg.sender,
            _reserve,
            _reserveTo,
            award
        );
        emit Swap(msg.sender, _reserve, _reserveTo, amountIn, award);
    }

    function _beforeClose(address _reserve, uint256 amountIn) private {
        DataTypes.ReserveData storage reserve = _reserves[_reserve];
        ValidationLogic.validateDeposit(reserve, amountIn);
        reserve.updateState();

        uint256 userBalance =
            IXToken(reserve.xTokenAddress).balanceOf(msg.sender);

        reserve.updateInterestRates(
            _reserve,
            reserve.xTokenAddress,
            0,
            amountIn
        );

        IXToken(reserve.xTokenAddress).burn(
            msg.sender,
            address(this),
            amountIn,
            reserve.liquidityIndex
        );

        if (amountIn == userBalance) {
            _usersConfig[msg.sender].setUsingAsCollateral(reserve.id, false);
            emit ReserveUsedAsCollateralDisabled(_reserve, msg.sender);
        }
    }

    function _beforeSwap(address _reserve, uint256 amountIn) private {
        DataTypes.ReserveData storage reserve = _reserves[_reserve];
        ValidationLogic.validateDeposit(reserve, amountIn);

        DataTypes.UserConfigurationMap storage userConfig =
            _usersConfig[msg.sender];

        reserve.updateState();
        bool isFirstBorrowing = false;
        isFirstBorrowing = IVariableDebtToken(reserve.variableDebtTokenAddress)
            .mint(
            msg.sender,
            msg.sender,
            amountIn,
            reserve.variableBorrowIndex
        );
        emit Borrow(
            _reserve,
            msg.sender,
            msg.sender,
            amountIn,
            reserve.currentVariableBorrowRate
        );

        if (isFirstBorrowing) {
            userConfig.setBorrowing(reserve.id, true);
        }

        reserve.updateInterestRates(
            _reserve,
            reserve.xTokenAddress,
            0,
            amountIn
        );

        IXToken(reserve.xTokenAddress).transferUnderlyingTo(
            address(this),
            amountIn
        );
    }

    /**
     * @notice Repays a borrowed `amount` on a specific reserve, burning the equivalent debt tokens owned
     * - E.g. User repays 100 USDC, burning 100 variable debt tokens of the `onBehalfOf` address
     * @param asset The address of the borrowed underlying asset previously borrowed
     * @param amount The amount to repay
     * - Send the value type(uint256).max in order to repay the whole debt for `asset` on the specific `debtMode`
     * @param onBehalfOf Address of the user who will get his debt reduced/removed. Should be the address of the
     * user calling the function if he wants to reduce/remove his own debt, or the address of any other
     * other borrower whose debt should be removed
     * @return The final amount repaid
     **/
    function repay(
        address asset,
        uint256 amount,
        address onBehalfOf
    ) external override whenNotPaused returns (uint256) {
        DataTypes.ReserveData storage reserve = _reserves[asset];

        uint256 variableDebt = Helpers.getUserCurrentDebt(onBehalfOf, reserve);
        address xToken = reserve.xTokenAddress;
        uint256 userBalance = IERC20(xToken).balanceOf(msg.sender);

        ValidationLogic.validateRepay(
            reserve,
            amount,
            onBehalfOf,
            variableDebt,
            userBalance
        );

        uint256 paybackAmount = variableDebt;

        if (amount < paybackAmount) {
            paybackAmount = amount;
        }

        reserve.updateState();

        IVariableDebtToken(reserve.variableDebtTokenAddress).burn(
            onBehalfOf,
            paybackAmount,
            reserve.variableBorrowIndex
        );

        reserve.updateInterestRates(asset, xToken, 0, 0);

        if (variableDebt.sub(paybackAmount) == 0) {
            _usersConfig[onBehalfOf].setBorrowing(reserve.id, false);
        }

        if (paybackAmount == userBalance) {
            _usersConfig[msg.sender].setUsingAsCollateral(reserve.id, false);
            emit ReserveUsedAsCollateralDisabled(asset, msg.sender);
        }

        IXToken(xToken).burn(
            msg.sender,
            xToken,
            paybackAmount,
            reserve.liquidityIndex
        );

        emit Repay(asset, onBehalfOf, msg.sender, paybackAmount);

        return paybackAmount;
    }

    /**
     * @dev Allows depositors to enable/disable a specific deposited asset as collateral
     * @param asset The address of the underlying asset deposited
     * @param useAsCollateral `true` if the user wants to use the deposit as collateral, `false` otherwise
     **/
    function setUserUseReserveAsCollateral(address asset, bool useAsCollateral)
        external
        override
        whenNotPaused
    {
        DataTypes.ReserveData storage reserve = _reserves[asset];

        ValidationLogic.validateSetUseReserveAsCollateral(
            reserve,
            asset,
            useAsCollateral,
            _reserves,
            _usersConfig[msg.sender],
            _reservesList,
            _reservesCount,
            _addressesProvider.getPriceOracle()
        );

        _usersConfig[msg.sender].setUsingAsCollateral(
            reserve.id,
            useAsCollateral
        );

        if (useAsCollateral) {
            emit ReserveUsedAsCollateralEnabled(asset, msg.sender);
        } else {
            emit ReserveUsedAsCollateralDisabled(asset, msg.sender);
        }
    }

    struct LiquidationCallLocalVars {
        uint256 variableDebt;
        uint256 userBalance;
        uint256 healthFactor;
        uint256 maxCollateralToLiquidate;
        uint256 collateralToSell;
        uint256 liquidatorPreviousXTokenBalance;
    }

       /**
     * @dev Function to liquidate a non-healthy position collateral-wise, with Health Factor below 1
     * - The caller (liquidator) covers `debtToCover` amount of debt of the user getting liquidated, and receives
     *   a proportionally amount of the `collateralAsset` plus a bonus to cover market risk
     * @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation
     * @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation
     * @param user The address of the borrower getting liquidated
     * @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover
     **/
    function liquidationCall(
        address collateralAsset,
        address debtAsset,
        address user,
        uint256 debtToCover
    ) external override whenNotPaused {
        LiquidationCallLocalVars memory vars;
        DataTypes.ReserveData storage collateralReserve =
            _reserves[collateralAsset];
        DataTypes.ReserveData storage debtReserve = _reserves[debtAsset];
        DataTypes.UserConfigurationMap storage userConfig = _usersConfig[user];

        vars.variableDebt = Helpers.getUserCurrentDebt(user, debtReserve).div(
            2
        );

        (, , , , vars.healthFactor) = GenericLogic.calculateUserAccountData(
            user,
            _reserves,
            _usersConfig[user],
            _reservesList,
            _reservesCount,
            _addressesProvider.getPriceOracle()
        );

        ValidationLogic.validateLiquidation(
            collateralReserve,
            debtReserve,
            userConfig,
            vars.healthFactor,
            vars.variableDebt
        );

        vars.variableDebt = vars.variableDebt > debtToCover
            ? debtToCover
            : vars.variableDebt;

        vars.userBalance = IERC20(collateralReserve.xTokenAddress).balanceOf(
            user
        );

        (vars.maxCollateralToLiquidate, vars.collateralToSell) = GenericLogic
            .calculateAvailableCollateralToLiquidate(
            collateralReserve,
            debtReserve,
            collateralAsset,
            debtAsset,
            vars.variableDebt,
            vars.userBalance,
            _addressesProvider.getPriceOracle()
        );

        collateralReserve.updateState();

        vars.liquidatorPreviousXTokenBalance = IERC20(
            collateralReserve
                .xTokenAddress
        )
            .balanceOf(msg.sender);

        IXToken(collateralReserve.xTokenAddress).transferOnLiquidation(
            user,
            msg.sender,
            (vars.maxCollateralToLiquidate.sub(vars.collateralToSell))
        );

        if (vars.liquidatorPreviousXTokenBalance == 0) {
            DataTypes.UserConfigurationMap storage liquidatorConfig =
                _usersConfig[msg.sender];
            liquidatorConfig.setUsingAsCollateral(collateralReserve.id, true);
            emit ReserveUsedAsCollateralEnabled(collateralAsset, msg.sender);
        }

        if (vars.maxCollateralToLiquidate == vars.userBalance) {
              userConfig.setUsingAsCollateral(collateralReserve.id, false);
              emit ReserveUsedAsCollateralDisabled(collateralAsset, user);
        }

        if(collateralAsset == debtAsset) {
          IVariableDebtToken(collateralReserve.variableDebtTokenAddress).burn(
              user,
              vars.collateralToSell,
              collateralReserve.variableBorrowIndex
          );

          collateralReserve.updateInterestRates(collateralAsset, collateralReserve.xTokenAddress, 0, 0);

          IXToken(collateralReserve.xTokenAddress).burn(
              user,
              collateralReserve.xTokenAddress,
              vars.collateralToSell,
              collateralReserve.liquidityIndex
          );
          
          emit LiquidationCall(
              collateralAsset,
              debtAsset,
              user,
              vars.collateralToSell,
              vars.collateralToSell,
              msg.sender
          );
          return;
        }

        collateralReserve.updateInterestRates(
            collateralAsset,
            collateralReserve.xTokenAddress,
            0,
            vars.collateralToSell
        );

        IXToken(collateralReserve.xTokenAddress).burn(
            user,
            address(this),
            vars.collateralToSell,
            collateralReserve.liquidityIndex
        );

        IERC20(collateralAsset).safeApprove(address(uniswaper), 0);
        IERC20(collateralAsset).safeApprove(
            address(uniswaper),
            vars.collateralToSell
        );

        address[] memory path;
        if (collateralAsset != wethAddress && debtAsset != wethAddress) {
            path = new address[](3);
            path[0] = collateralAsset;
            path[1] = wethAddress;
            path[2] = debtAsset;
        } else {
            path = new address[](2);
            path[0] = collateralAsset;
            path[1] = debtAsset;
        }

        uint256[] memory awards =
            uniswaper.swapExactTokensForTokens(
                vars.collateralToSell,
                vars.variableDebt.mul(97).div(100),
                path,
                address(this),
                block.timestamp
            );

        reDeposit(debtAsset, awards[awards.length - 1], user);

        emit LiquidationCall(
            collateralAsset,
            debtAsset,
            user,
            awards[awards.length - 1],
            vars.collateralToSell,
            msg.sender
        );
    }

    /**
     * @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 user account data across all the reserves
     * @param user The address of the user
     * @return totalCollateralETH the total collateral in ETH of the user
     * @return totalDebtETH the total debt in ETH of the user
     * @return availableBorrowsETH the borrowing power left of the user
     * @return currentLiquidationThreshold the liquidation threshold of the user
     * @return ltv the loan to value of the user
     * @return healthFactor the current health factor of the user
     **/
    function getUserAccountData(address user)
        external
        view
        override
        returns (
            uint256 totalCollateralETH,
            uint256 totalDebtETH,
            uint256 availableBorrowsETH,
            uint256 currentLiquidationThreshold,
            uint256 ltv,
            uint256 healthFactor
        )
    {
        (
            totalCollateralETH,
            totalDebtETH,
            ltv,
            currentLiquidationThreshold,
            healthFactor
        ) = GenericLogic.calculateUserAccountData(
            user,
            _reserves,
            _usersConfig[user],
            _reservesList,
            _reservesCount,
            _addressesProvider.getPriceOracle()
        );

        availableBorrowsETH = GenericLogic.calculateAvailableBorrowsETH(
            totalCollateralETH,
            totalDebtETH,
            ltv
        );
    }

    /**
     * @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 getConfiguration(address asset)
        external
        view
        override
        returns (DataTypes.ReserveConfigurationMap memory)
    {
        return _reserves[asset].configuration;
    }

    /**
     * @dev Returns the configuration of the user across all the reserves
     * @param user The user address
     * @return The configuration of the user
     **/
    function getUserConfiguration(address user)
        external
        view
        override
        returns (DataTypes.UserConfigurationMap memory)
    {
        return _usersConfig[user];
    }

    /**
     * @dev Returns the normalized income per unit of asset
     * @param asset The address of the underlying asset of the reserve
     * @return The reserve's normalized income
     */
    function getReserveNormalizedIncome(address asset)
        external
        view
        virtual
        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 if the MarginPool is paused
     */
    function paused() external view override returns (bool) {
        return _paused;
    }

    /**
     * @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 cached MarginPoolAddressesProvider connected to this contract
     **/
    function getAddressesProvider()
        external
        view
        override
        returns (IMarginPoolAddressesProvider)
    {
        return _addressesProvider;
    }

    /**
     * @dev Validates and finalizes an xToken transfer
     * - Only callable by the overlying xToken of the `asset`
     * @param asset The address of the underlying asset of the xToken
     * @param from The user from which the xTokens are transferred
     * @param to The user receiving the xTokens
     * @param amount The amount being transferred/withdrawn
     * @param balanceFromBefore The xToken balance of the `from` user before the transfer
     * @param balanceToBefore The xToken balance of the `to` user before the transfer
     */
    function finalizeTransfer(
        address asset,
        address from,
        address to,
        uint256 amount,
        uint256 balanceFromBefore,
        uint256 balanceToBefore
    ) external override whenNotPaused {
        require(
            msg.sender == _reserves[asset].xTokenAddress,
            Errors.MP_CALLER_MUST_BE_AN_XTOKEN
        );

        ValidationLogic.validateTransfer(
            from,
            _reserves,
            _usersConfig[from],
            _reservesList,
            _reservesCount,
            _addressesProvider.getPriceOracle()
        );

        uint256 reserveId = _reserves[asset].id;

        if (from != to) {
            if (balanceFromBefore.sub(amount) == 0) {
                DataTypes.UserConfigurationMap storage fromConfig =
                    _usersConfig[from];
                fromConfig.setUsingAsCollateral(reserveId, false);
                emit ReserveUsedAsCollateralDisabled(asset, from);
            }

            if (balanceToBefore == 0 && amount != 0) {
                DataTypes.UserConfigurationMap storage toConfig =
                    _usersConfig[to];
                toConfig.setUsingAsCollateral(reserveId, true);
                emit ReserveUsedAsCollateralEnabled(asset, to);
            }
        }
    }

    /**
     * @dev Initializes a reserve, activating it, assigning an xToken and debt tokens and an
     * interest rate strategy
     * - Only callable by the MarginPoolConfigurator contract
     * @param asset The address of the underlying asset of the reserve
     * @param xTokenAddress The address of the xToken that will be assigned to the reserve
     * @param xTokenAddress The address of the VariableDebtToken that will be assigned to the reserve
     * @param interestRateStrategyAddress The address of the interest rate strategy contract
     **/
    function initReserve(
        address asset,
        address xTokenAddress,
        address variableDebtAddress,
        address interestRateStrategyAddress
    ) external override onlyMarginPoolConfigurator {
        require(Address.isContract(asset), Errors.MP_NOT_CONTRACT);
        _reserves[asset].init(
            xTokenAddress,
            variableDebtAddress,
            interestRateStrategyAddress
        );
        _addReserveToList(asset);
    }

    /**
     * @dev Updates the address of the interest rate strategy contract
     * - Only callable by the MarginPoolConfigurator contract
     * @param asset The address of the underlying asset of the reserve
     * @param rateStrategyAddress The address of the interest rate strategy contract
     **/
    function setReserveInterestRateStrategyAddress(
        address asset,
        address rateStrategyAddress
    ) external override onlyMarginPoolConfigurator {
        _reserves[asset].interestRateStrategyAddress = rateStrategyAddress;
    }

    /**
     * @dev Sets the configuration bitmap of the reserve as a whole
     * - Only callable by the MarginPoolConfigurator contract
     * @param asset The address of the underlying asset of the reserve
     * @param configuration The new configuration bitmap
     **/
    function setConfiguration(address asset, uint256 configuration)
        external
        override
        onlyMarginPoolConfigurator
    {
        _reserves[asset].configuration.data = configuration;
    }

    /**
     * @dev Set the _pause state of a reserve
     * - Only callable by the MarginPoolConfigurator contract
     * @param val `true` to pause the reserve, `false` to un-pause it
     */
    function setPause(bool val) external override onlyMarginPoolConfigurator {
        _paused = val;
        if (_paused) {
            emit Paused();
        } else {
            emit Unpaused();
        }
    }

    struct ExecuteBorrowParams {
        address asset;
        address user;
        address onBehalfOf;
        uint256 amount;
        address xTokenAddress;
        bool releaseUnderlying;
    }

    function _executeBorrow(ExecuteBorrowParams memory vars) internal {
        DataTypes.ReserveData storage reserve = _reserves[vars.asset];
        DataTypes.UserConfigurationMap storage userConfig =
            _usersConfig[vars.onBehalfOf];

        address oracle = _addressesProvider.getPriceOracle();

        uint256 amountInETH =
            IPriceOracleGetter(oracle)
                .getAssetPrice(vars.asset)
                .mul(vars.amount)
                .div(10**reserve.configuration.getDecimals());

        ValidationLogic.validateBorrow(
            reserve,
            vars.onBehalfOf,
            vars.amount,
            amountInETH,
            _reserves,
            userConfig,
            _reservesList,
            _reservesCount,
            oracle
        );

        reserve.updateState();

        bool isFirstBorrowing = false;
        isFirstBorrowing = IVariableDebtToken(reserve.variableDebtTokenAddress)
            .mint(
            vars.user,
            vars.onBehalfOf,
            vars.amount,
            reserve.variableBorrowIndex
        );

        if (isFirstBorrowing) {
            userConfig.setBorrowing(reserve.id, true);
        }

        reserve.updateInterestRates(
            vars.asset,
            vars.xTokenAddress,
            0,
            vars.releaseUnderlying ? vars.amount : 0
        );

        if (vars.releaseUnderlying) {
            IXToken(vars.xTokenAddress).transferUnderlyingTo(
                vars.user,
                vars.amount
            );
        }

        emit Borrow(
            vars.asset,
            vars.user,
            vars.onBehalfOf,
            vars.amount,
            reserve.currentVariableBorrowRate
        );
    }

    function _addReserveToList(address asset) internal {
        uint256 reservesCount = _reservesCount;

        require(
            reservesCount < MAX_NUMBER_RESERVES,
            Errors.MP_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;
        }
    }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import {Ownable} from './Ownable.sol';
import './Address.sol';

// Prettier ignore to prevent buidler flatter bug
// prettier-ignore
import {InitializableImmutableAdminUpgradeabilityProxy} from './InitializableImmutableAdminUpgradeabilityProxy.sol';

import {IMarginPoolAddressesProvider} from './IMarginPoolAddressesProvider.sol';
// import './BaseUpgradeabilityProxy.sol';
/**
 * @title MarginPoolAddressesProvider 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 Lever Governance
 * @author Lever
 **/
contract MarginPoolAddressesProvider is Ownable, IMarginPoolAddressesProvider {
  mapping(bytes32 => address) private _addresses;

  bytes32 private constant MARGIN_POOL = 'MARGIN_POOL';
  bytes32 private constant MARGIN_POOL_CONFIGURATOR = 'MARGIN_POOL_CONFIGURATOR';
  bytes32 private constant POOL_ADMIN = 'POOL_ADMIN';
  bytes32 private constant EMERGENCY_ADMIN = 'EMERGENCY_ADMIN';
  bytes32 private constant PRICE_ORACLE = 'PRICE_ORACLE';
  bytes32 private constant LENDING_RATE_ORACLE = 'LENDING_RATE_ORACLE';
  bytes32 private constant LEVER_TOKEN = 'LEVER_TOKEN';
  bytes32 private constant TREASURY_ADDRESS = 'TREASURY_ADDRESS';
  bytes32 private constant REWARDS_DISTRIBUTION = 'REWARDS_DISTRIBUTION';
  bytes32 private constant SWAP_MINER = 'SWAP_MINER';
  bytes32 private constant ORDER_BOOK = 'ORDER_BOOK';

  constructor() public {
  }
  


  /**
   * @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)
    external
    override
    onlyOwner
  {
    _updateImpl(id, implementationAddress);
    emit AddressSet(id, implementationAddress, true);
  }

  /**
   * @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);
  }

  /**
   * @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 MarginPool proxy
   * @return The MarginPool proxy address
   **/
  function getMarginPool() external view override returns (address) {
    return getAddress(MARGIN_POOL);
  }

  /**
   * @dev Updates the implementation of the MarginPool, or creates the proxy
   * setting the new `pool` implementation on the first time calling it
   * @param pool The new MarginPool implementation
   **/
  function setMarginPoolImpl(address pool,address UniswapRouter, address SushiswapRouter,address _weth) external override onlyOwner {
    _updatePoolImpl(MARGIN_POOL, pool, UniswapRouter,SushiswapRouter, _weth);
    emit MarginPoolUpdated(pool);
  }

  /**
   * @dev Returns the address of the MarginPoolConfigurator proxy
   * @return The MarginPoolConfigurator proxy address
   **/
  function getMarginPoolConfigurator() external view override returns (address) {
    return getAddress(MARGIN_POOL_CONFIGURATOR);
  }

  /**
   * @dev Updates the implementation of the MarginPoolConfigurator, or creates the proxy
   * setting the new `configurator` implementation on the first time calling it
   * @param configurator The new MarginPoolConfigurator implementation
   **/
  function setMarginPoolConfiguratorImpl(address configurator) external override onlyOwner {
    _updateImpl(MARGIN_POOL_CONFIGURATOR, configurator);
    emit MarginPoolConfiguratorUpdated(configurator);
  }

  /**
   * @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 getPriceOracle() external view override returns (address) {
    return getAddress(PRICE_ORACLE);
  }

  function setPriceOracle(address priceOracle) external override onlyOwner {
    _addresses[PRICE_ORACLE] = priceOracle;
    emit PriceOracleUpdated(priceOracle);
  }


  function getLeverToken() external view override returns (address) {
    return getAddress(LEVER_TOKEN);
  }

  function setLeverToken(address lever) external override onlyOwner {
    _addresses[LEVER_TOKEN] = lever;
    emit LeverTokenUpdated(lever);
  }
  
  function getTreasuryAddress() external view override returns (address) {
    return getAddress(TREASURY_ADDRESS);
  }

  function setTreasuryAddress(address treasuryAddress) external override onlyOwner {
    _addresses[TREASURY_ADDRESS] = treasuryAddress;
    emit TreasuryAddressUpdated(treasuryAddress);
  }
  
  function getRewardsDistribution() external view override returns (address) {
    return getAddress(REWARDS_DISTRIBUTION);
  }

  function setRewardsDistribution(address rewardsDistribution) external override onlyOwner {
    _addresses[REWARDS_DISTRIBUTION] = rewardsDistribution;
    emit RewardsDistributionUpdated(rewardsDistribution);
  }

    /**
   * @dev Returns the address of the OrderBook proxy
   * @return The OrderBook proxy address
   **/
  function getOrderBook() external view override returns (address) {
    return getAddress(ORDER_BOOK);
  }

  /**
   * @dev Updates the implementation of the OrderBook, or creates the proxy
   * setting the new `pool` implementation on the first time calling it
   * @param orderBook The new OrderBook implementation
   **/
  function setOrderBookImpl(address orderBook, address UniswapRouter, address _weth) external override onlyOwner {
    _updateImpl(ORDER_BOOK, orderBook, UniswapRouter, _weth);
    emit OrderBookUpdated(orderBook);
  }
    /**
   * @dev Returns the address of the SwapMiner proxy
   * @return The SwapMiner proxy address
   **/
  function getSwapMiner() external view override returns (address) {
    return getAddress(SWAP_MINER);
  }

  /**
   * @dev Updates the implementation of the SwapMiner, or creates the proxy
   * setting the new `pool` implementation on the first time calling it
   * @param swapMiner The new SwapMiner implementation
   **/
  function setSwapMinerImpl(address swapMiner, address UniswapRouter, address _uniswapLevPairToken, address LeverUsdOracle) external override onlyOwner {
    _updateSwapMinerImpl(SWAP_MINER, swapMiner, UniswapRouter, _uniswapLevPairToken, LeverUsdOracle);
    emit SwapMinerUpdated(swapMiner);
  }

  

  /**
   * @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 initialize() 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]);

    InitializableImmutableAdminUpgradeabilityProxy proxy =
      InitializableImmutableAdminUpgradeabilityProxy(proxyAddress);
    bytes memory params = abi.encodeWithSignature('initialize(address)', address(this));

    if (proxyAddress == address(0)) {
      proxy = new InitializableImmutableAdminUpgradeabilityProxy(address(this));
      proxy.initialize(newAddress, params);
      _addresses[id] = address(proxy);
      emit ProxyCreated(id, address(proxy));
    } else {
      proxy.upgradeToAndCall(newAddress, params);
    }
  }

    /**
   * @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 initialize() 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, address UniswapRouter,address _weth) internal {
    address payable proxyAddress = payable(_addresses[id]);

    InitializableImmutableAdminUpgradeabilityProxy proxy =
      InitializableImmutableAdminUpgradeabilityProxy(proxyAddress);
    bytes memory params = abi.encodeWithSignature('initialize(address,address,address)', address(this), UniswapRouter,_weth);

    if (proxyAddress == address(0)) {
      proxy = new InitializableImmutableAdminUpgradeabilityProxy(address(this));
      proxy.initialize(newAddress, params);
      _addresses[id] = address(proxy);
      emit ProxyCreated(id, address(proxy));
    } else {
      proxy.upgradeToAndCall(newAddress, params);
    }
  }
    /**
   * @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 initialize() 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 _updatePoolImpl(bytes32 id, address newAddress, address UniswapRouter, address SushiswapRouter,address _weth) internal {
    address payable proxyAddress = payable(_addresses[id]);

    InitializableImmutableAdminUpgradeabilityProxy proxy =
      InitializableImmutableAdminUpgradeabilityProxy(proxyAddress);
    bytes memory params = abi.encodeWithSignature('initialize(address,address,address,address)', address(this), UniswapRouter,SushiswapRouter, _weth);

    if (proxyAddress == address(0)) {
      proxy = new InitializableImmutableAdminUpgradeabilityProxy(address(this));
      proxy.initialize(newAddress, params);
      _addresses[id] = address(proxy);
      emit ProxyCreated(id, address(proxy));
    } else {
      proxy.upgradeToAndCall(newAddress, params);
    }
  }

  function _updateSwapMinerImpl(bytes32 id, address newAddress, address UniswapRouter,address _uniswapLevPairToken,address LeverUsdOracle) internal {
    address payable proxyAddress = payable(_addresses[id]);

    InitializableImmutableAdminUpgradeabilityProxy proxy =
      InitializableImmutableAdminUpgradeabilityProxy(proxyAddress);
    bytes memory params = abi.encodeWithSignature('initialize(address,address,address,address)', address(this), UniswapRouter,_uniswapLevPairToken,LeverUsdOracle);

    if (proxyAddress == address(0)) {
      proxy = new InitializableImmutableAdminUpgradeabilityProxy(address(this));
      proxy.initialize(newAddress, params);
      _addresses[id] = address(proxy);
      emit ProxyCreated(id, address(proxy));
    } else {
      proxy.upgradeToAndCall(newAddress, params);
    }
  }


}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import {SafeMath} from './SafeMath.sol';
import {VersionedInitializable} from './VersionedInitializable.sol';
import {ReserveConfiguration} from './ReserveConfiguration.sol';
import {IMarginPoolAddressesProvider} from './IMarginPoolAddressesProvider.sol';
import {IMarginPool} from './IMarginPool.sol';
import {ITokenConfiguration} from './ITokenConfiguration.sol';
import {IERC20Detailed} from './IERC20Detailed.sol';
import {Errors} from './Errors.sol';
import {PercentageMath} from './PercentageMath.sol';
import {DataTypes} from './DataTypes.sol';

/**
 * @title MarginPoolConfigurator contract
 * @author Lever
 * @dev Implements the configuration methods for the Lever protocol
 **/

contract MarginPoolConfigurator is VersionedInitializable {
  using SafeMath for uint256;
  using PercentageMath for uint256;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;

  /**
   * @dev Emitted when a reserve is initialized.
   * @param asset The address of the underlying asset of the reserve
   * @param xToken The address of the associated xToken contract
   * @param variableDebtToken The address of the associated variable rate debt token
   * @param interestRateStrategyAddress The address of the interest rate strategy for the reserve
   **/
  event ReserveInitialized(
    address indexed asset,
    address indexed xToken,
    address variableDebtToken,
    address interestRateStrategyAddress
  );

  /**
   * @dev Emitted when borrowing is enabled on a reserve
   * @param asset The address of the underlying asset of the reserve
   * @param rateEnabled false otherwise
   **/

  /**
   * @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 the collateralization risk parameters for the specified asset are updated.
   * @param asset The address of the underlying asset of the reserve
   * @param ltv The loan to value of the asset when used as collateral
   * @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
   **/
  event CollateralConfigurationChanged(
    address indexed asset,
    uint256 ltv,
    uint256 liquidationThreshold,
    uint256 liquidationBonus
  );


  /**
   * @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 ReserveInterestRateStrategyChanged(address indexed asset, address strategy);

  /**
   * @dev Emitted when an xToken implementation is upgraded
   * @param asset The address of the underlying asset of the reserve
   * @param proxy The xToken proxy address
   * @param implementation The new xToken implementation
   **/
  event XTokenUpgraded(
    address indexed asset,
    address indexed proxy,
    address indexed implementation
  );


  /**
   * @dev Emitted when the implementation of a variable debt token is upgraded
   * @param asset The address of the underlying asset of the reserve
   * @param proxy The variable debt token proxy address
   * @param implementation The new xToken implementation
   **/
  event VariableDebtTokenUpgraded(
    address indexed asset,
    address indexed proxy,
    address indexed implementation
  );

  IMarginPoolAddressesProvider public addressesProvider;
  IMarginPool public pool;

  modifier onlyPoolAdmin {
    require(addressesProvider.getPoolAdmin() == msg.sender, Errors.CALLER_NOT_POOL_ADMIN);
    _;
  }

  modifier onlyEmergencyAdmin {
    require(
      addressesProvider.getEmergencyAdmin() == msg.sender,
      Errors.MPC_CALLER_NOT_EMERGENCY_ADMIN
    );
    _;
  }

  uint256 internal constant CONFIGURATOR_REVISION = 0x1;

  function getRevision() internal pure override returns (uint256) {
    return CONFIGURATOR_REVISION;
  }

  function initialize(IMarginPoolAddressesProvider provider) public initializer {
    addressesProvider = provider;
    pool = IMarginPool(addressesProvider.getMarginPool());
  }

  /**
   * @dev Initializes a reserve
   * @param xTokenImpl  The address of the xToken contract implementation
   * @param variableDebtTokenImpl The address of the variable debt token contract
   * @param underlyingAssetDecimals The decimals of the reserve underlying asset
   * @param interestRateStrategyAddress The address of the interest rate strategy contract for this reserve
   **/
  function initReserve(
    address xTokenImpl,
    address variableDebtTokenImpl,
    uint8 underlyingAssetDecimals,
    address interestRateStrategyAddress
  ) public onlyPoolAdmin {
    address asset = ITokenConfiguration(xTokenImpl).UNDERLYING_ASSET_ADDRESS();

    require(
      address(pool) == ITokenConfiguration(xTokenImpl).POOL(),
      Errors.MPC_INVALID_XTOKEN_POOL_ADDRESS
    );
    require(
      address(pool) == ITokenConfiguration(variableDebtTokenImpl).POOL(),
      Errors.MPC_INVALID_VARIABLE_DEBT_TOKEN_POOL_ADDRESS
    );
    require(
      asset == ITokenConfiguration(variableDebtTokenImpl).UNDERLYING_ASSET_ADDRESS(),
      Errors.MPC_INVALID_VARIABLE_DEBT_TOKEN_UNDERLYING_ADDRESS
    );


    pool.initReserve(
      asset,
      xTokenImpl,
      variableDebtTokenImpl,
      interestRateStrategyAddress
    );

    DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset);

    currentConfig.setDecimals(underlyingAssetDecimals);

    currentConfig.setActive(true);
    currentConfig.setFrozen(false);
    pool.setConfiguration(asset, currentConfig.data);

    emit ReserveInitialized(
      asset,
      xTokenImpl,
      variableDebtTokenImpl,
      interestRateStrategyAddress
    );
  }
  
 

  /**
   * @dev Enables borrowing on a reserve
   * @param asset The address of the underlying asset of the reserve
   **/
  function enableBorrowingOnReserve(address asset)
    external
    onlyPoolAdmin
  {
    DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset);

    currentConfig.setBorrowingEnabled(true);

    pool.setConfiguration(asset, currentConfig.data);

  }

  /**
   * @dev Disables borrowing on a reserve
   * @param asset The address of the underlying asset of the reserve
   **/
  function disableBorrowingOnReserve(address asset) external onlyPoolAdmin {
    DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset);

    currentConfig.setBorrowingEnabled(false);

    pool.setConfiguration(asset, currentConfig.data);
    emit BorrowingDisabledOnReserve(asset);
  }

  /**
   * @dev Configures the reserve 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 collateral
   * @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 above 100%. A value of 105%
   * means the liquidator will receive a 5% bonus
   **/
  function configureReserveAsCollateral(
    address asset,
    uint256 ltv,
    uint256 liquidationThreshold,
    uint256 liquidationBonus
  ) external onlyPoolAdmin {
    DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(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.MPC_INVALID_CONFIGURATION);

    if (liquidationThreshold != 0) {
      //liquidation bonus must be bigger than 100.00%, otherwise the liquidator would receive less
      //collateral than needed to cover the debt
      require(
        liquidationBonus > PercentageMath.PERCENTAGE_FACTOR,
        Errors.MPC_INVALID_CONFIGURATION
      );

      //if threshold * bonus is less than PERCENTAGE_FACTOR, it's guaranteed that at the moment
      //a loan is taken there is enough collateral available to cover the liquidation bonus
      require(
        liquidationThreshold.percentMul(liquidationBonus) <= PercentageMath.PERCENTAGE_FACTOR,
        Errors.MPC_INVALID_CONFIGURATION
      );
    } else {
      require(liquidationBonus == 0, Errors.MPC_INVALID_CONFIGURATION);
      //if the liquidation threshold is being set to 0,
      // the reserve is being disabled as collateral. To do so,
      //we need to ensure no liquidity is deposited
      _checkNoLiquidity(asset);
    }

    currentConfig.setLtv(ltv);
    currentConfig.setLiquidationThreshold(liquidationThreshold);
    currentConfig.setLiquidationBonus(liquidationBonus);

    pool.setConfiguration(asset, currentConfig.data);

    emit CollateralConfigurationChanged(asset, ltv, liquidationThreshold, liquidationBonus);
  }


  /**
   * @dev Activates a reserve
   * @param asset The address of the underlying asset of the reserve
   **/
  function activateReserve(address asset) external onlyPoolAdmin {
    DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset);

    currentConfig.setActive(true);

    pool.setConfiguration(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 {
    _checkNoLiquidity(asset);

    DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset);

    currentConfig.setActive(false);

    pool.setConfiguration(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 {
    DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset);

    currentConfig.setFrozen(true);

    pool.setConfiguration(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 {
    DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset);

    currentConfig.setFrozen(false);

    pool.setConfiguration(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 {
    DataTypes.ReserveConfigurationMap memory currentConfig = pool.getConfiguration(asset);

    currentConfig.setReserveFactor(reserveFactor);

    pool.setConfiguration(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 rateStrategyAddress The new address of the interest strategy contract
   **/
  function setReserveInterestRateStrategyAddress(address asset, address rateStrategyAddress)
    external
    onlyPoolAdmin
  {
    pool.setReserveInterestRateStrategyAddress(asset, rateStrategyAddress);
    emit ReserveInterestRateStrategyChanged(asset, rateStrategyAddress);
  }

  /**
   * @dev pauses or unpauses all the actions of the protocol, including xToken transfers
   * @param val true if protocol needs to be paused, false otherwise
   **/
  function setPoolPause(bool val) external onlyEmergencyAdmin {
    pool.setPause(val);
  }


  function _checkNoLiquidity(address asset) internal view {
    DataTypes.ReserveData memory reserveData = pool.getReserveData(asset);

    uint256 availableLiquidity = IERC20Detailed(asset).balanceOf(reserveData.xTokenAddress);

    require(
      availableLiquidity == 0 && reserveData.currentLiquidityRate == 0,
      Errors.MPC_RESERVE_LIQUIDITY_NOT_0
    );
  }
}

pragma solidity 0.6.12;
// SPDX-License-Identifier: agpl-3.0

import {UserConfiguration} from './UserConfiguration.sol';
import {ReserveConfiguration} from './ReserveConfiguration.sol';
import {ReserveLogic} from './ReserveLogic.sol';
import {IMarginPoolAddressesProvider} from './IMarginPoolAddressesProvider.sol';
import {DataTypes} from './DataTypes.sol';

contract MarginPoolStorage {
  using ReserveLogic for DataTypes.ReserveData;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  using UserConfiguration for DataTypes.UserConfigurationMap;

  IMarginPoolAddressesProvider internal _addressesProvider;

  mapping(address => DataTypes.ReserveData) internal _reserves;
  mapping(address => DataTypes.UserConfigurationMap) internal _usersConfig;

  // the list of the available reserves, structured as a mapping for gas savings reasons
  mapping(uint256 => address) internal _reservesList;

  uint256 internal _reservesCount;

  bool internal _paused;
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import {SafeMath} from './SafeMath.sol';
import {WadRayMath} from './WadRayMath.sol';

library MathUtils {
  using SafeMath for uint256;
  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.sub(uint256(lastUpdateTimestamp));

    return (rate.mul(timeDifference) / SECONDS_PER_YEAR).add(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.sub(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.mul(expMinusOne).mul(basePowerTwo) / 2;
    uint256 thirdTerm = exp.mul(expMinusOne).mul(expMinusTwo).mul(basePowerThree) / 6;

    return WadRayMath.ray().add(ratePerSecond.mul(exp)).add(secondTerm).add(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: MIT
pragma solidity >=0.4.22 <0.9.0;

contract Migrations {
  address public owner = msg.sender;
  uint public last_completed_migration;

  modifier restricted() {
    require(
      msg.sender == owner,
      "This function is restricted to the contract's owner"
    );
    _;
  }

  function setCompleted(uint completed) public restricted {
    last_completed_migration = completed;
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import './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.
 */
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() internal {
    address msgSender = _msgSender();
    _owner = msgSender;
    emit OwnershipTransferred(address(0), msgSender);
  }

  /**
   * @dev Returns the address of the current owner.
   */
  function owner() public view 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 {
    emit OwnershipTransferred(_owner, address(0));
    _owner = 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');
    emit OwnershipTransferred(_owner, newOwner);
    _owner = newOwner;
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import {Errors} from './Errors.sol';

/**
 * @title PercentageMath library
 * @author Lever
 * @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;

  /**
   * @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 0.6.12;

import {IPriceOracle} from './IPriceOracle.sol';

contract PriceOracle is IPriceOracle {
  mapping(address => uint256) prices;
  uint256 ethPriceUsd;

  event AssetPriceUpdated(address _asset, uint256 _price, uint256 timestamp);
  event EthPriceUpdated(uint256 _price, uint256 timestamp);

  function getAssetPrice(address _asset) external view override returns (uint256) {
    return prices[_asset];
  }

  function setAssetPrice(address _asset, uint256 _price) external override {
    prices[_asset] = _price;
    emit AssetPriceUpdated(_asset, _price, block.timestamp);
  }

  function getEthUsdPrice() external view returns (uint256) {
    return ethPriceUsd;
  }

  function setEthUsdPrice(uint256 _price) external {
    ethPriceUsd = _price;
    emit EthPriceUpdated(_price, block.timestamp);
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.6.0;

/**
 * @title Proxy
 * @dev Implements delegation of calls to other contracts, with proper
 * forwarding of return values and bubbling of failures.
 * It defines a fallback function that delegates all calls to the address
 * returned by the abstract _implementation() internal function.
 */
abstract contract Proxy {
  /**
   * @dev Fallback function.
   * Implemented entirely in `_fallback`.
   */
  fallback() external payable {
    _fallback();
  }

  /**
   * @return The Address of the implementation.
   */
  function _implementation() internal view virtual returns (address);

  /**
   * @dev Delegates execution to an implementation contract.
   * This is a low level function that doesn't return to its internal call site.
   * It will return to the external caller whatever the implementation returns.
   * @param implementation Address to delegate.
   */
  function _delegate(address implementation) internal {
    //solium-disable-next-line
    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 Function that is run as the first thing in the fallback function.
   * Can be redefined in derived contracts to add functionality.
   * Redefinitions must call super._willFallback().
   */
  function _willFallback() internal virtual {}

  /**
   * @dev fallback implementation.
   * Extracted to enable manual triggering.
   */
  function _fallback() internal {
    _willFallback();
    _delegate(_implementation());
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import {Errors} from './Errors.sol';
import {DataTypes} from './DataTypes.sol';

/**
 * @title ReserveConfiguration library
 * @author Lever
 * @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 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 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 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
   **/
  function getFlags(DataTypes.ReserveConfigurationMap storage self)
    internal
    view
    returns (
      bool,
      bool,
      bool
    )
  {
    uint256 dataLocal = self.data;

    return (
      (dataLocal & ~ACTIVE_MASK) != 0,
      (dataLocal & ~FROZEN_MASK) != 0,
      (dataLocal & ~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
   **/
  function getFlagsMemory(DataTypes.ReserveConfigurationMap memory self)
    internal
    pure
    returns (
      bool,
      bool,
      bool
    )
  {
    return (
      (self.data & ~ACTIVE_MASK) != 0,
      (self.data & ~FROZEN_MASK) != 0,
      (self.data & ~BORROWING_MASK) != 0
    );
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import {SafeMath} from './SafeMath.sol';
import {IERC20} from './IERC20.sol';
import {SafeERC20} from './SafeERC20.sol';
import {IXToken} from './IXToken.sol';
import {IVariableDebtToken} from './IVariableDebtToken.sol';
import {IReserveInterestRateStrategy} from './IReserveInterestRateStrategy.sol';
import {ReserveConfiguration} from './ReserveConfiguration.sol';
import {MathUtils} from './MathUtils.sol';
import {WadRayMath} from './WadRayMath.sol';
import {PercentageMath} from './PercentageMath.sol';
import {Errors} from './Errors.sol';
import {DataTypes} from './DataTypes.sol';

/**
 * @title ReserveLogic library
 * @author Lever
 * @notice Implements the logic to update the reserves state
 */
library ReserveLogic {
  using SafeMath for uint256;
  using WadRayMath for uint256;
  using PercentageMath for uint256;
  using SafeERC20 for IERC20;

  /**
   * @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 =
      IVariableDebtToken(reserve.variableDebtTokenAddress).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
    );
  }

  /**
   * @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.add(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 xTokenAddress The address of the overlying xtoken contract
   * @param interestRateStrategyAddress The address of the interest rate strategy contract
   **/
  function init(
    DataTypes.ReserveData storage reserve,
    address xTokenAddress,
    address variableDebtTokenAddress,
    address interestRateStrategyAddress
  ) external {
    require(reserve.xTokenAddress == address(0), Errors.RL_RESERVE_ALREADY_INITIALIZED);

    reserve.liquidityIndex = uint128(WadRayMath.ray());
    reserve.variableBorrowIndex = uint128(WadRayMath.ray());
    reserve.xTokenAddress = xTokenAddress;
    reserve.variableDebtTokenAddress = variableDebtTokenAddress;
    reserve.interestRateStrategyAddress = interestRateStrategyAddress;
  }

  struct UpdateInterestRatesLocalVars {
    uint256 availableLiquidity;
    uint256 newLiquidityRate;
    uint256 newVariableRate;
    uint256 totalVariableDebt;
  }

  /**
   * @dev Updates the reserve  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 (redeem or borrow)
   **/
  function updateInterestRates(
    DataTypes.ReserveData storage reserve,
    address reserveAddress,
    address xTokenAddress,
    uint256 liquidityAdded,
    uint256 liquidityTaken
  ) internal {
    UpdateInterestRatesLocalVars memory vars;

    //calculates the total variable debt locally using the scaled total supply instead
    //of totalSupply(), as it's noticeably cheaper. Also, the index has been
    //updated by the previous updateState() call
    vars.totalVariableDebt = IVariableDebtToken(reserve.variableDebtTokenAddress)
      .scaledTotalSupply()
      .rayMul(reserve.variableBorrowIndex);

    vars.availableLiquidity = IERC20(reserveAddress).balanceOf(xTokenAddress);

    (
      vars.newLiquidityRate,
      vars.newVariableRate
    ) = IReserveInterestRateStrategy(reserve.interestRateStrategyAddress).calculateInterestRates(
      vars.availableLiquidity.add(liquidityAdded).sub(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
  ) internal {
    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
      .sub(vars.previousVariableDebt);

    vars.amountToMint = vars.totalDebtAccrued.percentMul(vars.reserveFactor);

    if (vars.amountToMint != 0) {
      IXToken(reserve.xTokenAddress).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);

      //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: MIT

pragma solidity 0.6.12;

import {IERC20} from './IERC20.sol';
import {SafeMath} from './SafeMath.sol';
import {Address} from './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 SafeMath for uint256;
  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));
  }

  function safeApprove(
    IERC20 token,
    address spender,
    uint256 value
  ) internal {
    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 callOptionalReturn(IERC20 token, bytes memory data) private {
    require(address(token).isContract(), 'SafeERC20: call to non-contract');

    // solhint-disable-next-line avoid-low-level-calls
    (bool success, bytes memory returndata) = address(token).call(data);
    require(success, 'SafeERC20: low-level call failed');

    if (returndata.length > 0) {
      // Return data is optional
      // solhint-disable-next-line max-line-length
      require(abi.decode(returndata, (bool)), 'SafeERC20: ERC20 operation did not succeed');
    }
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
  /**
   * @dev Returns the addition of two unsigned integers, reverting on
   * overflow.
   *
   * Counterpart to Solidity's `+` operator.
   *
   * Requirements:
   * - Addition cannot overflow.
   */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    require(c >= a, 'SafeMath: addition overflow');

    return c;
  }

  /**
   * @dev Returns the subtraction of two unsigned integers, reverting on
   * overflow (when the result is negative).
   *
   * Counterpart to Solidity's `-` operator.
   *
   * Requirements:
   * - Subtraction cannot overflow.
   */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    return sub(a, b, 'SafeMath: subtraction overflow');
  }

  /**
   * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
   * overflow (when the result is negative).
   *
   * Counterpart to Solidity's `-` operator.
   *
   * Requirements:
   * - Subtraction cannot overflow.
   */
  function sub(
    uint256 a,
    uint256 b,
    string memory errorMessage
  ) internal pure returns (uint256) {
    require(b <= a, errorMessage);
    uint256 c = a - b;

    return c;
  }

  /**
   * @dev Returns the multiplication of two unsigned integers, reverting on
   * overflow.
   *
   * Counterpart to Solidity's `*` operator.
   *
   * Requirements:
   * - Multiplication cannot overflow.
   */
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
    if (a == 0) {
      return 0;
    }

    uint256 c = a * b;
    require(c / a == b, 'SafeMath: multiplication overflow');

    return c;
  }

  /**
   * @dev Returns the integer division of two unsigned integers. Reverts on
   * division by zero. The result is rounded towards zero.
   *
   * Counterpart to Solidity's `/` operator. Note: this function uses a
   * `revert` opcode (which leaves remaining gas untouched) while Solidity
   * uses an invalid opcode to revert (consuming all remaining gas).
   *
   * Requirements:
   * - The divisor cannot be zero.
   */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    return div(a, b, 'SafeMath: division by zero');
  }

  /**
   * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
   * division by zero. The result is rounded towards zero.
   *
   * Counterpart to Solidity's `/` operator. Note: this function uses a
   * `revert` opcode (which leaves remaining gas untouched) while Solidity
   * uses an invalid opcode to revert (consuming all remaining gas).
   *
   * Requirements:
   * - The divisor cannot be zero.
   */
  function div(
    uint256 a,
    uint256 b,
    string memory errorMessage
  ) internal pure returns (uint256) {
    // Solidity only automatically asserts when dividing by 0
    require(b > 0, errorMessage);
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold

    return c;
  }

  /**
   * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
   * Reverts when dividing by zero.
   *
   * Counterpart to Solidity's `%` operator. This function uses a `revert`
   * opcode (which leaves remaining gas untouched) while Solidity uses an
   * invalid opcode to revert (consuming all remaining gas).
   *
   * Requirements:
   * - The divisor cannot be zero.
   */
  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    return mod(a, b, 'SafeMath: modulo by zero');
  }

  /**
   * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
   * Reverts with custom message when dividing by zero.
   *
   * Counterpart to Solidity's `%` operator. This function uses a `revert`
   * opcode (which leaves remaining gas untouched) while Solidity uses an
   * invalid opcode to revert (consuming all remaining gas).
   *
   * Requirements:
   * - The divisor cannot be zero.
   */
  function mod(
    uint256 a,
    uint256 b,
    string memory errorMessage
  ) internal pure returns (uint256) {
    require(b != 0, errorMessage);
    return a % b;
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

library StringLib {
  function concat(string memory a, string memory b) internal pure returns (string memory) {
    return string(abi.encodePacked(a, b));
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import './BaseUpgradeabilityProxy.sol';

/**
 * @title UpgradeabilityProxy
 * @dev Extends BaseUpgradeabilityProxy with a constructor for initializing
 * implementation and init data.
 */
contract UpgradeabilityProxy is BaseUpgradeabilityProxy {
  /**
   * @dev Contract constructor.
   * @param _logic Address of the initial implementation.
   * @param _data Data to send as msg.data to the implementation to initialize the proxied contract.
   * It should include the signature and the parameters of the function to be called, as described in
   * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
   * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped.
   */
  constructor(address _logic, bytes memory _data) public payable {
    assert(IMPLEMENTATION_SLOT == bytes32(uint256(keccak256('eip1967.proxy.implementation')) - 1));
    _setImplementation(_logic);
    if (_data.length > 0) {
      (bool success, ) = _logic.delegatecall(_data);
      require(success);
    }
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import {Errors} from './Errors.sol';
import {DataTypes} from './DataTypes.sol';

/**
 * @title UserConfiguration library
 * @author Lever
 * @notice Implements the bitmap logic to handle the user configuration
 */
library UserConfiguration {
  uint256 internal constant BORROWING_MASK =
    0x5555555555555555555555555555555555555555555555555555555555555555;

  /**
   * @dev Sets if the user is borrowing the reserve identified by reserveIndex
   * @param self The configuration object
   * @param reserveIndex The index of the reserve in the bitmap
   * @param borrowing True if the user is borrowing the reserve, false otherwise
   **/
  function setBorrowing(
    DataTypes.UserConfigurationMap storage self,
    uint256 reserveIndex,
    bool borrowing
  ) internal {
    require(reserveIndex < 128, Errors.UL_INVALID_INDEX);
    self.data =
      (self.data & ~(1 << (reserveIndex * 2))) |
      (uint256(borrowing ? 1 : 0) << (reserveIndex * 2));
  }

  /**
   * @dev Sets if the user is using as collateral the reserve identified by reserveIndex
   * @param self The configuration object
   * @param reserveIndex The index of the reserve in the bitmap
   * @param usingAsCollateral True if the user is usin the reserve as collateral, false otherwise
   **/
  function setUsingAsCollateral(
    DataTypes.UserConfigurationMap storage self,
    uint256 reserveIndex,
    bool usingAsCollateral
  ) internal {
    require(reserveIndex < 128, Errors.UL_INVALID_INDEX);
    self.data =
      (self.data & ~(1 << (reserveIndex * 2 + 1))) |
      (uint256(usingAsCollateral ? 1 : 0) << (reserveIndex * 2 + 1));
  }

  /**
   * @dev Used to validate if a user has been using the reserve for borrowing or as collateral
   * @param self The configuration object
   * @param reserveIndex The index of the reserve in the bitmap
   * @return True if the user has been using a reserve for borrowing or as collateral, false otherwise
   **/
  function isUsingAsCollateralOrBorrowing(
    DataTypes.UserConfigurationMap memory self,
    uint256 reserveIndex
  ) internal pure returns (bool) {
    require(reserveIndex < 128, Errors.UL_INVALID_INDEX);
    return (self.data >> (reserveIndex * 2)) & 3 != 0;
  }

  /**
   * @dev Used to validate if a user has been using the reserve for borrowing
   * @param self The configuration object
   * @param reserveIndex The index of the reserve in the bitmap
   * @return True if the user has been using a reserve for borrowing, false otherwise
   **/
  function isBorrowing(DataTypes.UserConfigurationMap memory self, uint256 reserveIndex)
    internal
    pure
    returns (bool)
  {
    require(reserveIndex < 128, Errors.UL_INVALID_INDEX);
    return (self.data >> (reserveIndex * 2)) & 1 != 0;
  }

  /**
   * @dev Used to validate if a user has been using the reserve as collateral
   * @param self The configuration object
   * @param reserveIndex The index of the reserve in the bitmap
   * @return True if the user has been using a reserve as collateral, false otherwise
   **/
  function isUsingAsCollateral(DataTypes.UserConfigurationMap memory self, uint256 reserveIndex)
    internal
    pure
    returns (bool)
  {
    require(reserveIndex < 128, Errors.UL_INVALID_INDEX);
    return (self.data >> (reserveIndex * 2 + 1)) & 1 != 0;
  }

  /**
   * @dev Used to validate if a user has been borrowing from any reserve
   * @param self The configuration object
   * @return True if the user has been borrowing any reserve, false otherwise
   **/
  function isBorrowingAny(DataTypes.UserConfigurationMap memory self) internal pure returns (bool) {
    return self.data & BORROWING_MASK != 0;
  }

  /**
   * @dev Used to validate if a user has not been using any reserve
   * @param self The configuration object
   * @return True if the user has been borrowing any reserve, false otherwise
   **/
  function isEmpty(DataTypes.UserConfigurationMap memory self) internal pure returns (bool) {
    return self.data == 0;
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import {SafeMath} from "./SafeMath.sol";
import {IERC20} from "./IERC20.sol";
import {ReserveLogic} from "./ReserveLogic.sol";
import {GenericLogic} from "./GenericLogic.sol";
import {WadRayMath} from "./WadRayMath.sol";
import {PercentageMath} from "./PercentageMath.sol";
import {SafeERC20} from "./SafeERC20.sol";
import {ReserveConfiguration} from "./ReserveConfiguration.sol";
import {UserConfiguration} from "./UserConfiguration.sol";
import {Errors} from "./Errors.sol";
import {Helpers} from "./Helpers.sol";
import {IReserveInterestRateStrategy} from "./IReserveInterestRateStrategy.sol";
import {DataTypes} from "./DataTypes.sol";

/**
 * @title ReserveLogic library
 * @author Lever
 * @notice Implements functions to validate the different actions of the protocol
 */
library ValidationLogic {
    using ReserveLogic for DataTypes.ReserveData;
    using SafeMath for uint256;
    using WadRayMath for uint256;
    using PercentageMath for uint256;
    using SafeERC20 for IERC20;
    using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
    using UserConfiguration for DataTypes.UserConfigurationMap;

    uint256 public constant REBALANCE_UP_LIQUIDITY_RATE_THRESHOLD = 4000;
    uint256 public constant REBALANCE_UP_USAGE_RATIO_THRESHOLD = 0.95 * 1e27; //usage ratio of 95%

    /**
     * @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 reserveAddress The address of the reserve
     * @param amount The amount to be withdrawn
     * @param userBalance The balance of the user
     * @param reservesData The reserves state
     * @param userConfig The user configuration
     * @param reserves The addresses of the reserves
     * @param reservesCount The number of reserves
     * @param oracle The price oracle
     */
    function validateWithdraw(
        address reserveAddress,
        uint256 amount,
        uint256 userBalance,
        mapping(address => DataTypes.ReserveData) storage reservesData,
        DataTypes.UserConfigurationMap storage userConfig,
        mapping(uint256 => address) storage reserves,
        uint256 reservesCount,
        address oracle
    ) external view {
        require(amount != 0, Errors.VL_INVALID_AMOUNT);
        require(amount <= userBalance, Errors.VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE);

        (bool isActive, ,) = reservesData[reserveAddress].configuration.getFlags();
        require(isActive, Errors.VL_NO_ACTIVE_RESERVE);

        require(
            GenericLogic.balanceDecreaseAllowed(
                reserveAddress,
                msg.sender,
                amount,
                reservesData,
                userConfig,
                reserves,
                reservesCount,
                oracle
            ),
            Errors.VL_TRANSFER_NOT_ALLOWED
        );
    }

    struct ValidateBorrowLocalVars {
        uint256 currentLtv;
        uint256 currentLiquidationThreshold;
        uint256 amountOfCollateralNeededETH;
        uint256 userCollateralBalanceETH;
        uint256 userBorrowBalanceETH;
        uint256 availableLiquidity;
        uint256 healthFactor;
        bool isActive;
        bool isFrozen;
        bool borrowingEnabled;
    }

    /**
     * @dev Validates a borrow action
     * @param reserve The reserve state from which the user is borrowing
     * @param userAddress The address of the user
     * @param amount The amount to be borrowed
     * @param amountInETH The amount to be borrowed, in ETH
     * @param reservesData The state of all the reserves
     * @param userConfig The state of the user for the specific reserve
     * @param reserves The addresses of all the active reserves
     * @param oracle The price oracle
     */

    function validateBorrow(
        DataTypes.ReserveData storage reserve,
        address userAddress,
        uint256 amount,
        uint256 amountInETH,
        mapping(address => DataTypes.ReserveData) storage reservesData,
        DataTypes.UserConfigurationMap storage userConfig,
        mapping(uint256 => address) storage reserves,
        uint256 reservesCount,
        address oracle
    ) external view {
        ValidateBorrowLocalVars memory vars;

        (vars.isActive, vars.isFrozen, vars.borrowingEnabled) = reserve
            .configuration
            .getFlags();

        require(vars.isActive, Errors.VL_NO_ACTIVE_RESERVE);
        require(!vars.isFrozen, Errors.VL_RESERVE_FROZEN);
        require(amount != 0, Errors.VL_INVALID_AMOUNT);

        require(vars.borrowingEnabled, Errors.VL_BORROWING_NOT_ENABLED);

        (
            vars.userCollateralBalanceETH,
            vars.userBorrowBalanceETH,
            vars.currentLtv,
            vars.currentLiquidationThreshold,
            vars.healthFactor
        ) = GenericLogic.calculateUserAccountData(
            userAddress,
            reservesData,
            userConfig,
            reserves,
            reservesCount,
            oracle
        );

        require(vars.userCollateralBalanceETH > 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.
        vars.amountOfCollateralNeededETH = vars
            .userBorrowBalanceETH
            .add(amountInETH)
            .percentDiv(vars.currentLtv); //LTV is calculated in percentage

        require(
            vars.amountOfCollateralNeededETH <= vars.userCollateralBalanceETH,
            Errors.VL_COLLATERAL_CANNOT_COVER_NEW_BORROW
        );
    }

    struct ValidateSwapLocalVars {
        uint256 currentLtv;
        uint256 amountOfCollateralNeededETH;
        uint256 userCollateralBalanceETH;
        uint256 userBorrowBalanceETH;
        uint256 healthFactor;
    }

    /**
     * @dev Validates a swap action
     * @param userAddress The address of the user
     * @param reservesData The state of all the reserves
     * @param userConfig The state of the user for the specific reserve
     * @param reserves The addresses of all the active reserves
     * @param oracle The price oracle
     */

    function validateSwap(
        address userAddress,
        mapping(address => DataTypes.ReserveData) storage reservesData,
        DataTypes.UserConfigurationMap storage userConfig,
        mapping(uint256 => address) storage reserves,
        uint256 reservesCount,
        address oracle
    ) external view {
        ValidateSwapLocalVars memory vars;

        (
            vars.userCollateralBalanceETH,
            vars.userBorrowBalanceETH,
            vars.currentLtv,
            ,
            vars.healthFactor
        ) = GenericLogic.calculateUserAccountData(
            userAddress,
            reservesData,
            userConfig,
            reserves,
            reservesCount,
            oracle
        );

        require(vars.userCollateralBalanceETH > 0, Errors.VL_COLLATERAL_BALANCE_IS_0);

        require(vars.healthFactor > GenericLogic.HEALTH_FACTOR_LIQUIDATION_THRESHOLD, Errors.VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD);

        //the current already borrowed amount requested to calculate the total collateral needed.
        vars.amountOfCollateralNeededETH = vars.userBorrowBalanceETH.percentDiv(vars.currentLtv); //LTV is calculated in percentage

        require(
            vars.amountOfCollateralNeededETH <= vars.userCollateralBalanceETH,
            Errors.VL_COLLATERAL_CANNOT_COVER_NEW_BORROW
        );
    }

    /**
     * @dev Validates a repay action
     * @param reserve 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 onBehalfOf The address of the user msg.sender is repaying for
     * @param variableDebt The borrow balance of the user
     */
    function validateRepay(
        DataTypes.ReserveData storage reserve,
        uint256 amountSent,
        address onBehalfOf,
        uint256 variableDebt,
        uint256 userBalance
    ) external view {
        bool isActive = reserve.configuration.getActive();

        require(isActive, Errors.VL_NO_ACTIVE_RESERVE);

        require(amountSent > 0, Errors.VL_INVALID_AMOUNT);

        require(variableDebt > 0, Errors.VL_NO_DEBT_OF_SELECTED_TYPE);
        require(userBalance >= amountSent, "deposit is less than debt");

        require(
            amountSent != uint256(-1) || msg.sender == onBehalfOf,
            Errors.VL_NO_EXPLICIT_AMOUNT_TO_REPAY_ON_BEHALF
        );
    }



    /**
     * @dev Validates the action of setting an asset as collateral
     * @param reserve The state of the reserve that the user is enabling or disabling as collateral
     * @param reserveAddress The address of the reserve
     * @param reservesData The data of all the reserves
     * @param userConfig The state of the user for the specific reserve
     * @param reserves The addresses of all the active reserves
     * @param oracle The price oracle
     */
    function validateSetUseReserveAsCollateral(
        DataTypes.ReserveData storage reserve,
        address reserveAddress,
        bool useAsCollateral,
        mapping(address => DataTypes.ReserveData) storage reservesData,
        DataTypes.UserConfigurationMap storage userConfig,
        mapping(uint256 => address) storage reserves,
        uint256 reservesCount,
        address oracle
    ) external view {
        uint256 underlyingBalance = IERC20(reserve.xTokenAddress).balanceOf(msg.sender);

        require(underlyingBalance > 0, Errors.VL_UNDERLYING_BALANCE_NOT_GREATER_THAN_0);

        require(
            useAsCollateral ||
                GenericLogic.balanceDecreaseAllowed(
                    reserveAddress,
                    msg.sender,
                    underlyingBalance,
                    reservesData,
                    userConfig,
                    reserves,
                    reservesCount,
                    oracle
                ),
            Errors.VL_DEPOSIT_ALREADY_IN_USE
        );
    }

    /**
     * @dev Validates a flashloan action
     * @param assets The assets being flashborrowed
     * @param amounts The amounts for each asset being borrowed
     **/
    function validateFlashloan(address[] memory assets, uint256[] memory amounts) internal pure {
        require(assets.length == amounts.length, Errors.VL_INCONSISTENT_FLASHLOAN_PARAMS);
    }

   /**
     * @dev Validates the liquidation action
     * @param collateralReserve The reserve data of the collateral
     * @param principalReserve The reserve data of the principal
     * @param userConfig The user configuration
     * @param userHealthFactor The user's health factor
     * @param userVariableDebt Total variable debt balance of the user
     **/
    function validateLiquidation(
        DataTypes.ReserveData storage collateralReserve,
        DataTypes.ReserveData storage principalReserve,
        DataTypes.UserConfigurationMap storage userConfig,
        uint256 userHealthFactor,
        uint256 userVariableDebt
    ) external view {
        require(
            collateralReserve.configuration.getActive() &&
                principalReserve.configuration.getActive(),
            Errors.VL_NO_ACTIVE_RESERVE
        );

        require(
            userHealthFactor < GenericLogic.HEALTH_FACTOR_LIQUIDATION_THRESHOLD,
            Errors.MPCM_HEALTH_FACTOR_NOT_BELOW_THRESHOLD
        );

        bool isCollateralEnabled =
            collateralReserve.configuration.getLiquidationThreshold() > 0 &&
                userConfig.isUsingAsCollateral(collateralReserve.id);

        //if collateral isn't enabled as collateral by user, it cannot be liquidated
        require(
            isCollateralEnabled,
            Errors.MPCM_COLLATERAL_CANNOT_BE_LIQUIDATED
        );
        require(
            userVariableDebt > 0,
            Errors.MPCM_SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER
        );
    }

    /**
     * @dev Validates an xToken transfer
     * @param from The user from which the xTokens are being transferred
     * @param reservesData The state of all the reserves
     * @param userConfig The state of the user for the specific reserve
     * @param reserves The addresses of all the active reserves
     * @param oracle The price oracle
     */
    function validateTransfer(
        address from,
        mapping(address => DataTypes.ReserveData) storage reservesData,
        DataTypes.UserConfigurationMap storage userConfig,
        mapping(uint256 => address) storage reserves,
        uint256 reservesCount,
        address oracle
    ) internal view {
        (, , , , uint256 healthFactor) =
            GenericLogic.calculateUserAccountData(
                from,
                reservesData,
                userConfig,
                reserves,
                reservesCount,
                oracle
            );

        require(
            healthFactor >= GenericLogic.HEALTH_FACTOR_LIQUIDATION_THRESHOLD,
            Errors.VL_TRANSFER_NOT_ALLOWED
        );
    }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import {IVariableDebtToken} from "./IVariableDebtToken.sol";
import {WadRayMath} from "./WadRayMath.sol";
import {Errors} from "./Errors.sol";
import {DebtTokenBase} from "./DebtTokenBase.sol";
import {SafeMath} from "./SafeMath.sol";
import {
    IMarginPoolAddressesProvider
} from "./IMarginPoolAddressesProvider.sol";
import {IERC20} from "./IERC20.sol";
import {SafeERC20} from "./SafeERC20.sol";

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + (((a % 2) + (b % 2)) / 2);
    }
}

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the `nonReentrant` modifier
 * available, which can be aplied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 */
contract ReentrancyGuard {
    /// @dev counter to allow mutex lock with only one SSTORE operation
    uint256 private _guardCounter;

    constructor() internal {
        // The counter starts at one to prevent changing it from zero to a non-zero
        // value, which is a more expensive operation.
        _guardCounter = 1;
    }

    /**
     * @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 make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _guardCounter += 1;
        uint256 localCounter = _guardCounter;
        _;
        require(
            localCounter == _guardCounter,
            "ReentrancyGuard: reentrant call"
        );
    }
}

/**
 * @title VariableDebtToken
 * @notice Implements a variable debt token to track the borrowing positions of users
 * at variable rate mode
 * @author Lever
 **/
contract VariableDebtToken is DebtTokenBase, IVariableDebtToken, ReentrancyGuard {
    using WadRayMath for uint256;
    using SafeERC20 for IERC20;
    uint256 public constant DEBT_TOKEN_REVISION = 0x1;
    // address public rewardsDistribution;
    IERC20 public rewardsToken;
    uint256 public periodFinish = 0;
    uint256 public rewardRate = 0;
    uint256 public rewardsDuration = 30 days;
    uint256 public lastUpdateTime;
    uint256 public rewardPerTokenStored;

    mapping(address => uint256) public userRewardPerTokenPaid;
    mapping(address => uint256) public rewards;
    IMarginPoolAddressesProvider public addressesProvider;

    constructor(
        address _addressesProvider,
        address underlyingAsset,
        string memory name,
        string memory symbol,
        uint8 decimals
    )
        public
        DebtTokenBase(
            IMarginPoolAddressesProvider(_addressesProvider).getMarginPool(),
            underlyingAsset,
            name,
            symbol,
            decimals
        )
    {
    //   rewardsDistribution = IMarginPoolAddressesProvider(_addressesProvider).getRewardsDistribution();
      addressesProvider = IMarginPoolAddressesProvider(_addressesProvider);
      rewardsToken = IERC20(IMarginPoolAddressesProvider(_addressesProvider).getLeverToken());
    }

    /* ========== MODIFIERS ========== */

    modifier updateReward(address account) {
        rewardPerTokenStored = rewardPerToken();
        lastUpdateTime = lastTimeRewardApplicable();
        if (account != address(0)) {
            rewards[account] = earned(account);
            userRewardPerTokenPaid[account] = rewardPerTokenStored;
        }
        _;
    }

    modifier onlyRewardsDistribution() {
        require(
            msg.sender == addressesProvider.getRewardsDistribution(),
            "Caller is not RewardsDistribution contract"
        );
        _;
    }


    /**
     * @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;
        }

        return
            scaledBalance.rayMul(
                POOL.getReserveNormalizedVariableDebt(UNDERLYING_ASSET_ADDRESS)
            );
    }

    /**
     * @dev Mints debt token to the `onBehalfOf` address
     * -  Only callable by the MarginPool
     * @param user The address receiving the borrowed underlying, being the delegatee in case
     * of credit delegate, or same as `onBehalfOf` otherwise
     * @param onBehalfOf The address receiving the debt tokens
     * @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 override onlyMarginPool updateReward(onBehalfOf) returns (bool) {
        if (user != onBehalfOf) {
            _decreaseBorrowAllowance(onBehalfOf, user, amount);
        }

        uint256 previousBalance = super.balanceOf(onBehalfOf);
        uint256 amountScaled = amount.rayDiv(index);
        require(amountScaled != 0, Errors.CT_INVALID_MINT_AMOUNT);

        _mint(onBehalfOf, amountScaled);
        emit Transfer(address(0), onBehalfOf, amount);
        emit Mint(user, onBehalfOf, amount, index);

        return previousBalance == 0;
    }

    /**
     * @dev Burns user variable debt
     * - Only callable by the MarginPool
     * @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 onlyMarginPool updateReward(user) {
        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 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) {
        return
            super.totalSupply().rayMul(
                POOL.getReserveNormalizedVariableDebt(UNDERLYING_ASSET_ADDRESS)
            );
    }

    /**
     * @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());
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal override updateReward(from) updateReward(to) {
        super._transfer(from, to, amount);
    }

    function lastTimeRewardApplicable() public view returns (uint256) {
        return Math.min(block.timestamp, periodFinish);
    }

    function rewardPerToken() public view returns (uint256) {
        if (totalSupply() == 0) {
            return rewardPerTokenStored;
        }
        return
            rewardPerTokenStored.add(
                lastTimeRewardApplicable()
                    .sub(lastUpdateTime)
                    .mul(rewardRate)
                    .mul(1e18)
                    .div(totalSupply())
            );
    }

    function earned(address account) public view returns (uint256) {
        return
            balanceOf(account)
                .mul(rewardPerToken().sub(userRewardPerTokenPaid[account]))
                .div(1e18)
                .add(rewards[account]);
    }

    function getRewardForDuration() external view returns (uint256) {
        return rewardRate.mul(rewardsDuration);
    }

    function getReward() public nonReentrant updateReward(msg.sender) {
      uint256 reward = rewards[msg.sender];
      require(reward > 0);
      rewards[msg.sender] = 0;
      rewardsToken.safeTransfer(msg.sender, reward);
      emit RewardPaid(msg.sender, reward);
    }

    /* ========== RESTRICTED FUNCTIONS ========== */

       function notifyRewardAmount(uint256 reward, uint256 _rewardsDuration)
        external
        onlyRewardsDistribution
        updateReward(address(0))
    {
         // Ensure the provided reward amount is not more than the balance in the contract.
        // This keeps the reward rate in the right range, preventing overflows due to
        // very high values of rewardRate in the earned and rewardsPerToken functions;
        // Reward + leftover must be less than 2^256 / 10^18 to avoid overflow.
        uint256 balance = rewardsToken.balanceOf(address(this));
        if (block.timestamp >= periodFinish) {
            rewardsDuration = _rewardsDuration;
            rewardRate = reward.div(rewardsDuration);
            require(
                rewardRate <= balance.div(rewardsDuration),
                "Provided reward too high"
            );
            periodFinish = block.timestamp.add(rewardsDuration);
        } else {
            uint256 remaining = periodFinish.sub(block.timestamp);
            uint256 leftover = remaining.mul(rewardRate);
            rewardRate = reward.add(leftover).div(remaining);
            require(
                rewardRate <= balance.div(remaining),
                "Provided reward too high"
            );
        }


        lastUpdateTime = block.timestamp;
        emit RewardAdded(reward, _rewardsDuration);
    }

    /* ========== EVENTS ========== */

    event RewardAdded(uint256 reward, uint256 _rewardsDuration);
    event RewardPaid(address indexed user, uint256 reward);
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import {VariableDebtToken} from './VariableDebtToken.sol';
import {Ownable} from './Ownable.sol';
import {StringLib} from './StringLib.sol';

contract VariableTokensHelper is Ownable {
  address payable private pool;
  address private addressesProvider;
  event deployedContracts(address variableToken);

  constructor(address payable _pool, address _addressesProvider) public {
    pool = _pool;
    addressesProvider = _addressesProvider; 
  }

  function initDeployment(
    address[] calldata tokens,
    string[] calldata symbols,
    uint8[] calldata decimals
  ) external onlyOwner {
    require(tokens.length == symbols.length, 'Arrays not same length');
    require(pool != address(0), 'Pool can not be zero address');
    for (uint256 i = 0; i < tokens.length; i++) {
      emit deployedContracts(
        address(
          new VariableDebtToken(
            addressesProvider,
            tokens[i],
            StringLib.concat('Lever variable debt bearing ', symbols[i]),
            StringLib.concat('d', symbols[i]),
            decimals[i]
          )
        )
      );
    }
  }

}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

/**
 * @title VersionedInitializable
 *
 * @dev Helper contract to implement initializer functions. To use it, replace
 * the constructor with a function that has the `initializer` modifier.
 * WARNING: Unlike constructors, initializer functions must be manually
 * invoked. This applies both to deploying an Initializable contract, as well
 * as extending an Initializable contract via inheritance.
 * WARNING: When used with inheritance, manual care must be taken to not invoke
 * a parent initializer twice, or ensure that all initializers are idempotent,
 * because this is not dealt with automatically as with constructors.
 *
 * @author Lever, inspired by the OpenZeppelin Initializable contract
 */
abstract contract VersionedInitializable {
  /**
   * @dev Indicates that the contract has been initialized.
   */
  uint256 private lastInitializedRevision = 0;

  /**
   * @dev Indicates that the contract is in the process of being initialized.
   */
  bool private initializing;

  /**
   * @dev Modifier to use in the initializer function of a contract.
   */
  modifier initializer() {
    uint256 revision = getRevision();
    require(
      initializing || isConstructor() || revision > lastInitializedRevision,
      'Contract instance has already been initialized'
    );

    bool isTopLevelCall = !initializing;
    if (isTopLevelCall) {
      initializing = true;
      lastInitializedRevision = revision;
    }

    _;

    if (isTopLevelCall) {
      initializing = false;
    }
  }

  /**
   * @dev returns the revision number of the contract
   * Needs to be defined in the inherited class as a constant.
   **/
  function getRevision() internal pure virtual returns (uint256);

  /**
   * @dev Returns true if and only if the function is running in the constructor
   **/
  function isConstructor() private view returns (bool) {
    // extcodesize checks the size of the code stored in an address, and
    // address returns the current address. Since the code is still not
    // deployed when running a constructor, any checks on its code size will
    // yield zero, making it an effective way to detect if a contract is
    // under construction or not.
    uint256 cs;
    //solium-disable-next-line
    assembly {
      cs := extcodesize(address())
    }
    return cs == 0;
  }

  // Reserved storage space to allow for layout changes in the future.
  uint256[50] private ______gap;
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import {Errors} from './Errors.sol';

/**
 * @title WadRayMath library
 * @author Lever
 * @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 halfWAD = WAD / 2;

  uint256 internal constant RAY = 1e27;
  uint256 internal constant halfRAY = 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 halfRAY;
  }

  /**
   * @return Half ray, 1e18/2
   **/
  function halfWad() internal pure returns (uint256) {
    return halfWAD;
  }

  /**
   * @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 - halfWAD) / b, Errors.MATH_MULTIPLICATION_OVERFLOW);

    return (a * b + halfWAD) / 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 - halfRAY) / b, Errors.MATH_MULTIPLICATION_OVERFLOW);

    return (a * b + halfRAY) / 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 0.6.12;
pragma experimental ABIEncoderV2;

import {Ownable} from './Ownable.sol';
import {IERC20} from './IERC20.sol';
import {IWETH} from './IWETH.sol';
import {IWETHGateway} from './IWETHGateway.sol';
import {IMarginPool} from './IMarginPool.sol';
import {IXToken} from './IXToken.sol';
import {ICreditDelegationToken} from './ICreditDelegationToken.sol';
import {ReserveConfiguration} from './ReserveConfiguration.sol';
import {UserConfiguration} from './UserConfiguration.sol';
import {Helpers} from './Helpers.sol';
import {DataTypes} from './DataTypes.sol';

contract WETHGateway is IWETHGateway, Ownable {
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  using UserConfiguration for DataTypes.UserConfigurationMap;

  IWETH internal immutable WETH;
  IMarginPool internal immutable POOL;
  IXToken internal immutable xWETH;
  ICreditDelegationToken internal immutable dWETH;

  /**
   * @dev Sets the WETH address and the MarginPoolAddressesProvider address. Infinite approves margin pool.
   * @param weth Address of the Wrapped Ether contract
   * @param pool Address of the MarginPool contract
   **/
  constructor(address weth, address pool) public {
    IMarginPool poolInstance = IMarginPool(pool);
    WETH = IWETH(weth);
    POOL = poolInstance;
    xWETH = IXToken(poolInstance.getReserveData(weth).xTokenAddress);
    dWETH = ICreditDelegationToken(poolInstance.getReserveData(weth).variableDebtTokenAddress);
    IWETH(weth).approve(pool, uint256(-1));
  }

  /**
   * @dev deposits WETH into the reserve, using native ETH. A corresponding amount of the overlying asset (xTokens)
   * is minted.
   * @param onBehalfOf address of the user who will receive the xTokens representing the deposit
   **/
  function depositETH(address onBehalfOf) external payable override {
    WETH.deposit{value: msg.value}();
    POOL.deposit(address(WETH), msg.value, onBehalfOf);
  }

  /**
   * @dev withdraws the WETH _reserves of msg.sender.
   * @param amount amount of xWETH to withdraw and receive native ETH
   * @param to address of the user who will receive native ETH
   */
  function withdrawETH(uint256 amount, address to) external override {
    uint256 userBalance = xWETH.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;
    }
    xWETH.transferFrom(msg.sender, address(this), amountToWithdraw);
    POOL.withdraw(address(WETH), amountToWithdraw, address(this));
    WETH.withdraw(amountToWithdraw);
    _safeTransferETH(to, amountToWithdraw);
  }

  /**
   * @dev borrow WETH, unwraps to ETH and send both the ETH and DebtTokens to msg.sender, via `approveDelegation` and onBehalf argument in `MarginPool.borrow`.
   * @param amount the amount of ETH to borrow
   */
  function borrowETH(
    uint256 amount
  ) external override {
    POOL.borrow(address(WETH), amount, msg.sender);
    WETH.withdraw(amount);
    _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');
  }

  /**
   * @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 emergencyTokenTransfer(
    address token,
    address to,
    uint256 amount
  ) external onlyOwner {
    IERC20(token).transfer(to, amount);
  }

  /**
   * @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 {
    _safeTransferETH(to, amount);
  }

  /**
   * @dev Get WETH address used by WETHGateway
   */
  function getWETHAddress() external view returns (address) {
    return address(WETH);
  }

  /**
   * @dev Get xWETH address used by WETHGateway
   */
  function getXWETHAddress() external view returns (address) {
    return address(xWETH);
  }

  /**
   * @dev Get MarginPool address used by WETHGateway
   */
  function getMarginPoolAddress() external view returns (address) {
    return address(POOL);
  }

  /**
   * @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: agpl-3.0
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import {IMarginPoolAddressesProvider} from './IMarginPoolAddressesProvider.sol';
import {MarginPoolConfigurator} from './MarginPoolConfigurator.sol';
import {XToken} from './XToken.sol';
import {
  DefaultReserveInterestRateStrategy
} from './DefaultReserveInterestRateStrategy.sol';
import {Ownable} from './Ownable.sol';
import {StringLib} from './StringLib.sol';

contract XTokensAndRatesHelper is Ownable {
  address payable private pool;
  address private addressesProvider;
  address private poolConfigurator;
  event deployedContracts(address xToken, address strategy);

  constructor(
    address _addressesProvider,
    address _poolConfigurator
  ) public {
    addressesProvider = _addressesProvider;
    poolConfigurator = _poolConfigurator;
  }

 
  function initDeployment(
    address[] calldata assets,
    string[] calldata symbols,
    uint256[4][] calldata rates,
    uint8[] calldata decimals
  ) external onlyOwner {
    require(assets.length == symbols.length, 't Arrays not same length');
    require(rates.length == symbols.length, 'r Arrays not same length');
    for (uint256 i = 0; i < assets.length; i++) {
      emit deployedContracts(
        address(
          new XToken(
            addressesProvider,
            assets[i],
            StringLib.concat('Lever interest bearing ', symbols[i]),
            StringLib.concat('x', symbols[i]),
            decimals[i]
          )
        ),
        address(
          new DefaultReserveInterestRateStrategy(
            IMarginPoolAddressesProvider(addressesProvider),
            rates[i][0],
            rates[i][1],
            rates[i][2],
            rates[i][3]
          )
        )
      );
    }
  }

  function initReserve(
    address[] calldata variables,
    address[] calldata xTokens,
    address[] calldata strategies,
    uint8[] calldata reserveDecimals
  ) external onlyOwner {
    require(xTokens.length == variables.length);
    require(strategies.length == variables.length);
    require(reserveDecimals.length == variables.length);

    for (uint256 i = 0; i < variables.length; i++) {
      MarginPoolConfigurator(poolConfigurator).initReserve(
        xTokens[i],
        variables[i],
        reserveDecimals[i],
        strategies[i]
      );
    }
  }

  function configureReserves(
    address[] calldata assets,
    uint256[] calldata baseLTVs,
    uint256[] calldata liquidationThresholds,
    uint256[] calldata liquidationBonuses,
    uint256[] calldata reserveFactors
  ) external onlyOwner {
    require(baseLTVs.length == assets.length);
    require(liquidationThresholds.length == assets.length);
    require(liquidationBonuses.length == assets.length);
    require(reserveFactors.length == assets.length);

    MarginPoolConfigurator configurator = MarginPoolConfigurator(poolConfigurator);
    for (uint256 i = 0; i < assets.length; i++) {
      configurator.configureReserveAsCollateral(
        assets[i],
        baseLTVs[i],
        liquidationThresholds[i],
        liquidationBonuses[i]
      );

      configurator.setReserveFactor(assets[i], reserveFactors[i]);
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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

-----Decoded View---------------
Arg [0] : _addressesProvider (address): 0x375Cfb020DCDa2d02Aa47B4aDbe94e924d30A67d
Arg [1] : underlyingAssetAddress (address): 0x7Fc66500c84A76Ad7e9c93437bFc5Ac33E2DDaE9
Arg [2] : tokenName (string): Lever interest bearing AAVE
Arg [3] : tokenSymbol (string): xAAVE
Arg [4] : decimals (uint8): 18

-----Encoded View---------------
9 Constructor Arguments found :
Arg [0] : 000000000000000000000000375cfb020dcda2d02aa47b4adbe94e924d30a67d
Arg [1] : 0000000000000000000000007fc66500c84a76ad7e9c93437bfc5ac33e2ddae9
Arg [2] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [3] : 00000000000000000000000000000000000000000000000000000000000000e0
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000012
Arg [5] : 000000000000000000000000000000000000000000000000000000000000001b
Arg [6] : 4c6576657220696e7465726573742062656172696e6720414156450000000000
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000005
Arg [8] : 7841415645000000000000000000000000000000000000000000000000000000

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