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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import "../Pool.sol";
import "../interfaces/IServiceConfigurationV3.sol";
import "./interfaces/IPoolFactory.sol";

import "../interfaces/IPoolRegistry.sol";
import {BeaconProxy} from "@openzeppelin/contracts/proxy/beacon/BeaconProxy.sol";
import "../upgrades/BeaconProxyFactory.sol";

/**
 * @title A factory that emits Pool contracts.
 * @dev Acts as a beacon contract, emitting beacon proxies and holding a reference
 * to their implementation contract.
 */

contract PoolFactory is IPoolFactory, BeaconProxyFactory {
    /**
     * @dev Reference to the WithdrawControllerFactory contract
     */
    address internal _withdrawControllerFactory;

    address private _poolAccessControlFactory;

    /**
     * @dev Reference to the PoolControllerFactory contract
     */
    address internal _poolControllerFactory;

    /**
     * @dev Reference to the VaultFactory contract
     */
    address internal _vaultFactory;

    function version() public pure returns (uint16) {
        return 256 * 2 + 0;
    }

    modifier onlyVerifiedPoolAdmin() {
        require(
            IServiceConfigurationV3(address(_serviceConfiguration)).isPoolAdmin(
                msg.sender
            ),
            "CALLER_NOT_ADMIN"
        );
        _;
    }

    /**
     * @dev Constructor
     * @param serviceConfiguration Reference to the global service configuration.
     * @param withdrawControllerFactory Reference to the withdraw controller factory.
     * @param poolControllerFactory Reference to the pool controller factory.
     * @param vaultFactory Reference to the Vault factory.
     */
    constructor(
        address serviceConfiguration,
        address withdrawControllerFactory,
        address poolControllerFactory,
        address vaultFactory,
        address poolAccessControlFactory
    ) {
        _serviceConfiguration = IServiceConfigurationV3(serviceConfiguration);
        _withdrawControllerFactory = withdrawControllerFactory;
        _poolControllerFactory = poolControllerFactory;
        _vaultFactory = vaultFactory;
        _poolAccessControlFactory = poolAccessControlFactory;
    }

    function getWithdrawControllerFactory() external view returns (address) {
        return _withdrawControllerFactory;
    }

    function getPoolControllerFactory() external view returns (address) {
        return _poolControllerFactory;
    }

    function getVaultFactory() external view returns (address) {
        return _vaultFactory;
    }

    function getPoolAccessControlFactory() external view returns (address) {
        return _poolAccessControlFactory;
    }

    /**
     * @inheritdoc IPoolFactory
     */
    function createPool(
        address liquidityAsset,
        IPoolConfigurableSettings calldata settings,
        string calldata tokenName,
        string calldata tokenSymbol
    ) public onlyVerifiedPoolAdmin returns (address poolAddress) {
        require(
            implementation != address(0),
            "PoolFactory: no implementation set"
        );
        require(
            _serviceConfiguration.paused() == false,
            "PoolFactory: Protocol paused"
        );

        require(
            _serviceConfiguration.isLiquidityAsset(liquidityAsset),
            "PoolFactory: invalid asset"
        );

        require(
            _serviceConfiguration.getPoolFactory() == address(this),
            "PoolFactory: not correct"
        );
        // Create the pool
        address addr = initializePool(
            liquidityAsset,
            settings,
            tokenName,
            tokenSymbol
        );

        IPoolRegistry(_serviceConfiguration.getPoolRegistry()).addPool(addr);

        emit PoolCreated(addr);
        return addr;
    }

    /**
     * @dev Creates the new Pool contract.
     */
    function initializePool(
        address liquidityAsset,
        IPoolConfigurableSettings calldata settings,
        string calldata tokenName,
        string calldata tokenSymbol
    ) internal virtual returns (address) {
        PoolAddressList memory poolAddressList = PoolAddressList(
            liquidityAsset,
            msg.sender,
            address(_serviceConfiguration),
            _withdrawControllerFactory,
            _poolControllerFactory,
            _vaultFactory,
            _poolAccessControlFactory
        );

        // Create beacon proxy
        BeaconProxy proxy = new BeaconProxy(
            address(this),
            abi.encodeWithSelector(
                Pool.initialize.selector,
                poolAddressList,
                settings,
                tokenName,
                tokenSymbol
            )
        );
        return address(proxy);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

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

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized != type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20Upgradeable.sol";
import "./extensions/IERC20MetadataUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import {Initializable} from "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20Upgradeable is Initializable, ContextUpgradeable, IERC20Upgradeable, IERC20MetadataUpgradeable {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    function __ERC20_init(string memory name_, string memory symbol_) internal onlyInitializing {
        __ERC20_init_unchained(name_, symbol_);
    }

    function __ERC20_init_unchained(string memory name_, string memory symbol_) internal onlyInitializing {
        _name = name_;
        _symbol = symbol_;
    }

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

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, 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}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, 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}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

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

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

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

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[45] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20MetadataUpgradeable is IERC20Upgradeable {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20PermitUpgradeable {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @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);

    /**
     * @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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";
import "../extensions/IERC20PermitUpgradeable.sol";
import "../../../utils/AddressUpgradeable.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20Upgradeable {
    using AddressUpgradeable for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20Upgradeable token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20Upgradeable token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20Upgradeable token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20Upgradeable token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20Upgradeable token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20Upgradeable token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20PermitUpgradeable token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20Upgradeable token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20Upgradeable token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && AddressUpgradeable.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/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/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (interfaces/draft-IERC1822.sol)

pragma solidity ^0.8.0;

/**
 * @dev ERC1822: Universal Upgradeable Proxy Standard (UUPS) documents a method for upgradeability through a simplified
 * proxy whose upgrades are fully controlled by the current implementation.
 */
interface IERC1822Proxiable {
    /**
     * @dev Returns the storage slot that the proxiable contract assumes is being used to store the implementation
     * address.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy.
     */
    function proxiableUUID() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (interfaces/IERC1967.sol)

pragma solidity ^0.8.0;

/**
 * @dev ERC-1967: Proxy Storage Slots. This interface contains the events defined in the ERC.
 *
 * _Available since v4.8.3._
 */
interface IERC1967 {
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Emitted when the beacon is changed.
     */
    event BeaconUpgraded(address indexed beacon);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (proxy/beacon/BeaconProxy.sol)

pragma solidity ^0.8.0;

import "./IBeacon.sol";
import "../Proxy.sol";
import "../ERC1967/ERC1967Upgrade.sol";

/**
 * @dev This contract implements a proxy that gets the implementation address for each call from an {UpgradeableBeacon}.
 *
 * The beacon address is stored in storage slot `uint256(keccak256('eip1967.proxy.beacon')) - 1`, so that it doesn't
 * conflict with the storage layout of the implementation behind the proxy.
 *
 * _Available since v3.4._
 */
contract BeaconProxy is Proxy, ERC1967Upgrade {
    /**
     * @dev Initializes the proxy with `beacon`.
     *
     * If `data` is nonempty, it's used as data in a delegate call to the implementation returned by the beacon. This
     * will typically be an encoded function call, and allows initializing the storage of the proxy like a Solidity
     * constructor.
     *
     * Requirements:
     *
     * - `beacon` must be a contract with the interface {IBeacon}.
     */
    constructor(address beacon, bytes memory data) payable {
        _upgradeBeaconToAndCall(beacon, data, false);
    }

    /**
     * @dev Returns the current beacon address.
     */
    function _beacon() internal view virtual returns (address) {
        return _getBeacon();
    }

    /**
     * @dev Returns the current implementation address of the associated beacon.
     */
    function _implementation() internal view virtual override returns (address) {
        return IBeacon(_getBeacon()).implementation();
    }

    /**
     * @dev Changes the proxy to use a new beacon. Deprecated: see {_upgradeBeaconToAndCall}.
     *
     * If `data` is nonempty, it's used as data in a delegate call to the implementation returned by the beacon.
     *
     * Requirements:
     *
     * - `beacon` must be a contract.
     * - The implementation returned by `beacon` must be a contract.
     */
    function _setBeacon(address beacon, bytes memory data) internal virtual {
        _upgradeBeaconToAndCall(beacon, data, false);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)

pragma solidity ^0.8.0;

/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/ERC1967/ERC1967Upgrade.sol)

pragma solidity ^0.8.2;

import "../beacon/IBeacon.sol";
import "../../interfaces/IERC1967.sol";
import "../../interfaces/draft-IERC1822.sol";
import "../../utils/Address.sol";
import "../../utils/StorageSlot.sol";

/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 */
abstract contract ERC1967Upgrade is IERC1967 {
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }

    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(address newImplementation, bytes memory data, bool forceCall) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(newImplementation, data);
        }
    }

    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallUUPS(address newImplementation, bytes memory data, bool forceCall) internal {
        // Upgrades from old implementations will perform a rollback test. This test requires the new
        // implementation to upgrade back to the old, non-ERC1822 compliant, implementation. Removing
        // this special case will break upgrade paths from old UUPS implementation to new ones.
        if (StorageSlot.getBooleanSlot(_ROLLBACK_SLOT).value) {
            _setImplementation(newImplementation);
        } else {
            try IERC1822Proxiable(newImplementation).proxiableUUID() returns (bytes32 slot) {
                require(slot == _IMPLEMENTATION_SLOT, "ERC1967Upgrade: unsupported proxiableUUID");
            } catch {
                revert("ERC1967Upgrade: new implementation is not UUPS");
            }
            _upgradeToAndCall(newImplementation, data, forceCall);
        }
    }

    /**
     * @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 Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlot.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }

    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }

    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;

    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(_BEACON_SLOT).value;
    }

    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(Address.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            Address.isContract(IBeacon(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlot.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }

    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(address newBeacon, bytes memory data, bool forceCall) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (proxy/Proxy.sol)

pragma solidity ^0.8.0;

/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internal call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())

            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)

            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())

            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }

    /**
     * @dev This is a virtual function that should be overridden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);

    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internal call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback() external payable virtual {
        _fallback();
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive() external payable virtual {
        _fallback();
    }

    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overridden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

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

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, 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}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, 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}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

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

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

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

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

    /**
     * @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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: address zero is not a valid owner");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _ownerOf(tokenId);
        require(owner != address(0), "ERC721: invalid token ID");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        _requireMinted(tokenId);

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overridden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not token owner or approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        _requireMinted(tokenId);

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(address from, address to, uint256 tokenId) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");
        _safeTransfer(from, to, tokenId, data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(address from, address to, uint256 tokenId, bytes memory data) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist
     */
    function _ownerOf(uint256 tokenId) internal view virtual returns (address) {
        return _owners[tokenId];
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _ownerOf(tokenId) != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(address to, uint256 tokenId, bytes memory data) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId, 1);

        // Check that tokenId was not minted by `_beforeTokenTransfer` hook
        require(!_exists(tokenId), "ERC721: token already minted");

        unchecked {
            // Will not overflow unless all 2**256 token ids are minted to the same owner.
            // Given that tokens are minted one by one, it is impossible in practice that
            // this ever happens. Might change if we allow batch minting.
            // The ERC fails to describe this case.
            _balances[to] += 1;
        }

        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);

        _afterTokenTransfer(address(0), to, tokenId, 1);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     * This is an internal function that does not check if the sender is authorized to operate on the token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId, 1);

        // Update ownership in case tokenId was transferred by `_beforeTokenTransfer` hook
        owner = ERC721.ownerOf(tokenId);

        // Clear approvals
        delete _tokenApprovals[tokenId];

        unchecked {
            // Cannot overflow, as that would require more tokens to be burned/transferred
            // out than the owner initially received through minting and transferring in.
            _balances[owner] -= 1;
        }
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);

        _afterTokenTransfer(owner, address(0), tokenId, 1);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(address from, address to, uint256 tokenId) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId, 1);

        // Check that tokenId was not transferred by `_beforeTokenTransfer` hook
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");

        // Clear approvals from the previous owner
        delete _tokenApprovals[tokenId];

        unchecked {
            // `_balances[from]` cannot overflow for the same reason as described in `_burn`:
            // `from`'s balance is the number of token held, which is at least one before the current
            // transfer.
            // `_balances[to]` could overflow in the conditions described in `_mint`. That would require
            // all 2**256 token ids to be minted, which in practice is impossible.
            _balances[from] -= 1;
            _balances[to] += 1;
        }
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId, 1);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits an {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits an {ApprovalForAll} event.
     */
    function _setApprovalForAll(address owner, address operator, bool approved) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Reverts if the `tokenId` has not been minted yet.
     */
    function _requireMinted(uint256 tokenId) internal view virtual {
        require(_exists(tokenId), "ERC721: invalid token ID");
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    /// @solidity memory-safe-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens will be transferred to `to`.
     * - When `from` is zero, the tokens will be minted for `to`.
     * - When `to` is zero, ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 firstTokenId, uint256 batchSize) internal virtual {}

    /**
     * @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`.
     * - When `from` is zero, the tokens were minted for `to`.
     * - When `to` is zero, ``from``'s tokens were burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 firstTokenId, uint256 batchSize) internal virtual {}

    /**
     * @dev Unsafe write access to the balances, used by extensions that "mint" tokens using an {ownerOf} override.
     *
     * WARNING: Anyone calling this MUST ensure that the balances remain consistent with the ownership. The invariant
     * being that for any address `a` the value returned by `balanceOf(a)` must be equal to the number of tokens such
     * that `ownerOf(tokenId)` is `a`.
     */
    // solhint-disable-next-line func-name-mixedcase
    function __unsafe_increaseBalance(address account, uint256 amount) internal {
        _balances[account] += amount;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/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/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @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.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // 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 (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @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) {
        return a + b;
    }

    /**
     * @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 a - b;
    }

    /**
     * @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) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting 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 a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting 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) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * 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) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/StorageSlot.sol)
// This file was procedurally generated from scripts/generate/templates/StorageSlot.js.

pragma solidity ^0.8.0;

/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```solidity
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, `uint256`._
 * _Available since v4.9 for `string`, `bytes`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }

    struct BooleanSlot {
        bool value;
    }

    struct Bytes32Slot {
        bytes32 value;
    }

    struct Uint256Slot {
        uint256 value;
    }

    struct StringSlot {
        string value;
    }

    struct BytesSlot {
        bytes value;
    }

    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `StringSlot` with member `value` located at `slot`.
     */
    function getStringSlot(bytes32 slot) internal pure returns (StringSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `StringSlot` representation of the string storage pointer `store`.
     */
    function getStringSlot(string storage store) internal pure returns (StringSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := store.slot
        }
    }

    /**
     * @dev Returns an `BytesSlot` with member `value` located at `slot`.
     */
    function getBytesSlot(bytes32 slot) internal pure returns (BytesSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BytesSlot` representation of the bytes storage pointer `store`.
     */
    function getBytesSlot(bytes storage store) internal pure returns (BytesSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := store.slot
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";
import "./math/SignedMath.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `int256` to its ASCII `string` decimal representation.
     */
    function toString(int256 value) internal pure returns (string memory) {
        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }

    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return keccak256(bytes(a)) == keccak256(bytes(b));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/structs/EnumerableSet.sol)
// This file was procedurally generated from scripts/generate/templates/EnumerableSet.js.

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```solidity
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 *
 * [WARNING]
 * ====
 * Trying to delete such a structure from storage will likely result in data corruption, rendering the structure
 * unusable.
 * See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 * In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an
 * array of EnumerableSet.
 * ====
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastValue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastValue;
                // Update the index for the moved value
                set._indexes[lastValue] = valueIndex; // Replace lastValue's index to valueIndex
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        bytes32[] memory store = _values(set._inner);
        bytes32[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import "../../interfaces/IPool.sol";
import "../../interfaces/ILoan.sol";

/**
 * @dev Expresses the various states a pool can be in throughout its lifecycle.
 */
enum IPoolLifeCycleState {
    Initialized,
    Active,
    Closed,
    DisruptionOrDefault
}

/**
 * @title The various configurable settings that customize Pool behavior.
 */
struct IPoolConfigurableSettings {
    uint256 maxCapacity; // amount
    uint256 endDate; // epoch seconds
    address borrowerManager;
    address borrowerWalletAddress;
    uint256 closeOfBusinessTime;
    uint256 earlyWithdrawFeeBps;
}

/**
 * @title A Pool's Admin controller
 * @dev Pool Admin's interact with the pool via the controller, including funding loans and adjusting
 * settings.
 */
interface IPoolController {
    /**
     * @dev Emitted when pool settings are updated.
     */
    event PoolSettingsUpdated();

    /**
     * @dev Emitted when the pool transitions a lifecycle state.
     */
    event LifeCycleStateTransition(IPoolLifeCycleState state);

    /**
     * @dev Emitted when a pool is marked as in DisruptionOrDefault.
     */
    event DisruptionOrDefault(address indexed pool);

    event Rescheduled(address indexed pool);

    function version() external returns (uint16);

    /**
     * @dev The Pool's admin
     */
    function admin() external view returns (address);

    /*//////////////////////////////////////////////////////////////
                Settings
    //////////////////////////////////////////////////////////////*/

    /**
     * @dev The current configurable pool settings.
     */
    function settings()
        external
        view
        returns (IPoolConfigurableSettings memory);

    function serviceConfiguration() external view returns (address);

    /**
     * @dev Allow the current pool admin to update the pool capacity at any
     * time.
     */
    function setPoolCapacity(uint256) external;

    /**
     * @dev Allow the current pool admin to update the pool's end date. The end date can
     * only be moved earlier (but not in the past, as measured by the current block's timestamp).
     * Once the end date is reached, the Pool is closed.
     */
    function setPoolEndDate(uint256) external;

    function closeOfBusinessTime() external view returns (uint256);

    function borrowerManager() external view returns (address);

    function borrowerWalletAddress() external view returns (address);

    /*//////////////////////////////////////////////////////////////
                State
    //////////////////////////////////////////////////////////////*/

    function reschedule(
        address loan,
        uint256 accrualStartDayTimestamp,
        uint256 transferInWindowDurationDays,
        uint256 transferOutWindowDurationDays,
        uint256 durationDays
    ) external;

    /**
     * @dev Returns the current pool lifecycle state.
     */
    function state() external view returns (IPoolLifeCycleState);

    function activatePool() external;

    /*//////////////////////////////////////////////////////////////
                Loans
    //////////////////////////////////////////////////////////////*/
    function approveLoanForPool(address loan) external;

    function initiateRollover(address loan, address priorLoan) external;

    function completeRolloverNetPayment(address) external;

    function disruptionOrDefault() external;

    function releaseRolloverRedemption(address owner) external;

    /*//////////////////////////////////////////////////////////////
                Fees
    //////////////////////////////////////////////////////////////*/

    /**
     * @dev Called by the pool admin, this claims fees that have accumulated
     * in the Pool's FeeVault from ongoing borrower payments.
     */
    function withdrawFeeVault(uint256 amount, address receiver) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import "../../interfaces/IPool.sol";

struct IPoolRolloverWithdrawState {
    uint256 requestedShares; // Number of shares requested in the `latestPeriod`
    uint256 requestedAssets;
    uint256 redeemableShares; // The shares that are currently withdrawable
    uint256 withdrawableAssets; // The assets that are currently withdrawable
    uint256 earlyRequestedShares; // The period in which the shares were requested
    uint256 earlyRequestedAssets;
    uint256 earlyAcceptedShares; // The period in which the shares were requested
    uint256 earlyAcceptedAssets;
}

/**
 * @title A Pool's Withdraw controller
 * @dev Holds state related to withdraw requests, and logic for snapshotting the
 * pool's liquidity reserve at regular intervals, earmarking funds for lenders according
 * to their withdrawal requests.
 */
interface IWithdrawController {
    function version() external pure returns (uint16);

    function pool() external view returns (address);

    function feeVault() external view returns (address);

    function borrowerVault() external view returns (address);

    function borrowerWallet() external view returns (address);

    function withdrawFeeVault(uint256 amount, address receiver) external;

    /*//////////////////////////////////////////////////////////////
                            Balance Views
    //////////////////////////////////////////////////////////////*/
    function drawDownToBorrowerWallet(uint256 amount) external;

    function redemptionState() external view returns (IRedemptionState memory);

    function requestedSharesOf(
        address owner
    ) external view returns (uint256 shares);

    function requestedAssetsOf(
        address owner
    ) external view returns (uint256 assets);

    function redeemableSharesOf(
        address owner
    ) external view returns (uint256 shares);

    function withdrawableAssetsOf(
        address owner
    ) external view returns (uint256 assets);

    /**
     * @dev Returns the number of shares that are available to be redeemed by
     * the owner in the current block.
     */
    function totalRequestedShares() external view returns (uint256);

    function totalRequestedAssets() external view returns (uint256 assets);

    /**
     * @dev Returns the number of shares that are available to be redeemed
     * overall in the current block.
     */
    function totalRedeemableShares() external view returns (uint256);

    /**
     * @dev Returns the number of `assets` that are available to be withdrawn
     * overall in the current block.
     */
    function totalWithdrawableAssets() external view returns (uint256);

    function releaseRolloverRedemption(
        address owner
    ) external returns (uint256 shares, uint256 assets);

    /*//////////////////////////////////////////////////////////////
                            Max Methods
    //////////////////////////////////////////////////////////////*/

    /**
     * @dev Returns the maximum number of `shares` that can be
     * requested to be redeemed from the owner balance with a single
     * `requestRedeem` call in the current block.
     *
     * Note: This is equivalent of EIP-4626 `maxRedeem`
     */
    function maxRedeemRequest(address) external view returns (uint256);

    /**
     * @dev The maximum amount of shares that can be redeemed from the owner
     * balance through a redeem call.
     */
    function maxRedeem(address) external view returns (uint256);

    /**
     * @dev Returns the maximum amount of underlying assets that can be
     * withdrawn from the owner balance with a single withdraw call.
     */
    function maxWithdraw(address) external view returns (uint256);

    /*//////////////////////////////////////////////////////////////
                            Preview Methods
    //////////////////////////////////////////////////////////////*/

    /**
     * @dev Simulates the effects of their redeemption at the current block.
     * Per EIP4626, should round DOWN.
     */
    function previewRedeem(address, uint256) external view returns (uint256);

    /**
     * @dev Simulate the effects of their withdrawal at the current block.
     * Per EIP4626, should round UP on the number of shares required for assets.
     */
    function previewWithdraw(address, uint256) external view returns (uint256);

    /*//////////////////////////////////////////////////////////////
                            Request Methods
    //////////////////////////////////////////////////////////////*/

    /**
     * @dev Requests redeeming a specific number of `shares` and `assets` from
     * the pool.
     *
     * NOTE: The pool is responsible for handling any fees, and for providing
     * the proper shares/assets ratio.
     */
    function performRequest(address, uint256, uint256) external;

    /*//////////////////////////////////////////////////////////////
                          Early Withdraw Methods
  //////////////////////////////////////////////////////////////*/

    function requestEarlyRedeem(
        address owner,
        uint256 shares
    ) external returns (uint256 principal);

    function acceptEarlyRedeemRequest(
        address investorAddr
    ) external returns (uint256 shares, uint256 principal);

    function repayEarlyWithdraw(
        address investorAddr,
        uint256 amount
    )
        external
        returns (
            uint256 principal,
            uint256 repayment,
            uint256 redeemedShares,
            uint256 fees,
            uint256 assetReduction
        );

    function totalEarlyRequestedShares() external view returns (uint256 shares);

    function totalEarlyRequestedAssets() external view returns (uint256 assets);

    function totalEarlyAcceptedShares() external view returns (uint256 shares);

    function totalEarlyAcceptedAssets() external view returns (uint256 assets);

    function earlyRequestedSharesOf(
        address owner
    ) external view returns (uint256 shares);

    function earlyRequestedAssetsOf(
        address owner
    ) external view returns (uint256 assets);

    function earlyAcceptedSharesOf(
        address owner
    ) external view returns (uint256 shares);

    function earlyAcceptedAssetsOf(
        address owner
    ) external view returns (uint256 assets);

    /*//////////////////////////////////////////////////////////////
                            Withdraw / Redeem
    //////////////////////////////////////////////////////////////*/

    /**
     * @dev Redeems a specific number of shares from owner and send assets of underlying token from the vault to receiver.
     *
     * Per EIP4626, should round DOWN.
     */
    function redeem(address, uint256) external returns (uint256);

    /**
     * @dev Burns shares from owner and send exactly assets token from the vault to receiver.
     * Should round UP for EIP4626.
     */
    function withdraw(address, uint256) external returns (uint256);

    function payFees(uint256) external;

    function repayLoan(uint256) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import "../../interfaces/ILoan.sol";

/**
 * @title Interface for the LoanFactory.
 */
interface ILoanFactory {
    /**
     * @dev Emitted when a loan is created.
     */
    event LoanCreated(address indexed addr, address indexed poolAddr);

    /**
     * @dev Creates a loan
     * @dev Emits `LoanCreated` event.
     */
    function createLoan(
        address borrower,
        address pool,
        address liquidityAsset,
        ILoanSettings memory settings
    ) external returns (address);

    function version() external pure returns (uint16);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

/**
 * @title An interface for a factory that creates PoolAccessControl contracts.
 */
interface IPoolAccessControlFactory {
    /**
     * @dev Creates a new PoolAccessControl.
     */
    function create(address pool) external returns (address);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import "../../interfaces/IPool.sol";

/**
 * @title Interface for the PoolController factory.
 */
interface IPoolControllerFactory {
    /**
     * @dev Emitted when a pool is created.
     */
    event PoolControllerCreated(address indexed pool, address indexed addr);

    /**
     * @dev Creates a pool's PoolAdmin controller
     * @dev Emits `PoolControllerCreated` event.
     */
    function createController(
        address pool,
        address serviceConfiguration,
        address admin,
        address liquidityAsset,
        IPoolConfigurableSettings memory poolSettings
    ) external returns (address);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import "../../interfaces/IPool.sol";

/**
 * @title Interface for the PoolFactory.
 */
interface IPoolFactory {
    /**
     * @dev Emitted when a pool is created.
     */
    event PoolCreated(address indexed addr);

    /**
     * @dev Creates a Pool.
     * @dev Emits `PoolCreated` event.
     */
    function createPool(
        address,
        IPoolConfigurableSettings calldata,
        string calldata,
        string calldata
    ) external returns (address);

    function getPoolControllerFactory() external view returns (address);

    function getWithdrawControllerFactory() external view returns (address);

    function getVaultFactory() external view returns (address);

    function getPoolAccessControlFactory() external view returns (address);

    function version() external pure returns (uint16);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

/**
 * @title Interface for the VaultFactory.
 */

enum IVaultType {
    Default,
    PoolVault,
    BorrowerVault,
    FeeVault,
    FundingVault
}

interface IVaultFactory {
    /**
     * @dev Emitted when a vault is created.
     */
    event VaultCreated(address indexed owner);

    /**
     * @dev Creates a new vault.
     * @dev Emits a `VaultCreated` event.
     */
    function createVault(
        address owner,
        IVaultType vaultType
    ) external returns (address);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

/**
 * @title Interface for the WithdrawController factory.
 */
interface IWithdrawControllerFactory {
    /**
     * @dev Emitted when a pool WithdrawController is created.
     */
    event WithdrawControllerCreated(address indexed addr);

    /**
     * @dev Creates a pool's withdraw controller
     * @dev Emits `WithdrawControllerCreated` event.
     */
    function createController(
        address pool,
        address vaultFactory,
        address borrowerWalletAddress
    ) external returns (address);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import "../interfaces/IServiceConfigurationV3.sol";
import "./interfaces/ILoanFactory.sol";
import "../interfaces/IPool.sol";
import "../Loan.sol";
import "../upgrades/BeaconProxyFactory.sol";
import {BeaconProxy} from "@openzeppelin/contracts/proxy/beacon/BeaconProxy.sol";

/**
 * @title A factory that emits Loan contracts.
 * @dev Acts as a beacon contract, emitting beacon proxies and holding a reference
 * to their implementation contract.
 */
contract LoanFactory is ILoanFactory, BeaconProxyFactory {
    mapping(address => bool) public isLoan;

    /**
     * @dev A reference to the VaultFactory.
     */
    address internal _vaultFactory;

    function version() public pure returns (uint16) {
        return 256 * 1 + 0;
    }

    /**
     * @dev Constructor for the LoanFactory.
     * @param serviceConfiguration Reference to the global service configuration.
     * @param vaultFactory Reference to a VaultFactory.
     */
    constructor(address serviceConfiguration, address vaultFactory) {
        _serviceConfiguration = IServiceConfigurationV3(serviceConfiguration);
        _vaultFactory = vaultFactory;
    }

    /**
     * @dev Creates a Loan
     * @dev Emits `LoanCreated` event.
     */
    function createLoan(
        address borrower,
        address pool,
        address liquidityAsset,
        ILoanSettings memory settings
    ) public returns (address) {
        require(
            _serviceConfiguration.paused() == false,
            "LoanFactory: Protocol paused"
        );

        require(implementation != address(0), "LoanFactory: no implementation");
        require(
            msg.sender == IPool(pool).borrowerManagerAddr(),
            "LoanFactory: Caller not borrowerManager"
        );
        require(
            borrower == IPool(pool).borrowerManagerAddr(),
            "LoanFactory: Caller not borrowerManager"
        );

        address addr = initializeLoan(borrower, pool, liquidityAsset, settings);

        IPool(pool).loanCreated(addr);

        emit LoanCreated(addr, pool);
        isLoan[addr] = true;
        return addr;
    }

    /**
     * @dev Internal initialization of Beacon proxy for Loans
     */
    function initializeLoan(
        address borrower,
        address pool,
        address liquidityAsset,
        ILoanSettings memory settings_
    ) internal returns (address) {
        BeaconProxy proxy = new BeaconProxy(
            address(this),
            abi.encodeWithSelector(
                Loan.initialize.selector,
                address(_serviceConfiguration),
                address(this),
                borrower,
                pool,
                liquidityAsset,
                _vaultFactory,
                settings_
            )
        );
        return address(proxy);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";

/**
 * @title The interface according to the ERC-4626 standard.
 */
interface IERC4626 is IERC20Upgradeable {
    /**
     * @dev Emitted when tokens are deposited into the vault via the mint and deposit methods.
     */
    event Deposit(
        address indexed sender,
        address indexed owner,
        uint256 assets,
        uint256 shares
    );

    /**
     * @dev Emitted when shares are withdrawn from the vault by a depositor in the redeem or withdraw methods.
     */
    event Withdraw(
        address indexed sender,
        address indexed receiver,
        address indexed owner,
        uint256 assets,
        uint256 shares
    );

    /**
     * @dev Return the address of the underlying ERC-20 token used for the vault for accounting, depositing, withdrawing.
     */
    function asset() external view returns (address);

    /**
     * @dev Calculate the total amount of underlying assets held by the vault.
     * NOTE: This method includes assets that are marked for withdrawal.
     */
    function totalAssets() external view returns (uint256);

    /**
     * @dev Calculates the amount of shares that would be exchanged by the vault for the amount of assets provided.
     * Rounds DOWN per EIP4626.
     */
    function convertToShares(uint256 assets) external view returns (uint256);

    /**
     * @dev Calculates the amount of assets that would be exchanged by the vault for the amount of shares provided.
     * Rounds DOWN per EIP4626.
     */
    function convertToAssets(uint256 shares) external view returns (uint256);

    /**
     * @dev Calculates the maximum amount of underlying assets that can be deposited in a single deposit call by the receiver.
     */
    function maxDeposit(address receiver) external view returns (uint256);

    /**
     * @dev Allows users to simulate the effects of their deposit at the current block.
     */
    function previewDeposit(uint256 assets) external view returns (uint256);

    /**
     * @dev Deposits assets of underlying tokens into the vault and grants ownership of shares to receiver.
     * Emits a {Deposit} event.
     */
    function deposit(
        uint256 assets,
        address receiver
    ) external returns (uint256);

    /**
     * @dev Returns the maximum amount of shares that can be minted in a single mint call by the receiver.
     */
    function maxMint(address receiver) external view returns (uint256);

    /**
     * @dev Allows users to simulate the effects of their mint at the current block.
     */
    function previewMint(uint256 shares) external view returns (uint256);

    /**
     * @dev Mints exactly shares vault shares to receiver by depositing assets of underlying tokens.
     * Emits a {Deposit} event.
     */
    function mint(uint256 shares, address receiver) external returns (uint256);

    /**
     * @dev Returns the maximum amount of underlying assets that can be withdrawn from the owner balance with a single withdraw call.
     */
    function maxWithdraw(address owner) external view returns (uint256);

    /**
     * @dev Simulate the effects of their withdrawal at the current block.
     * Per EIP4626, should round UP on the number of shares required for assets.
     */
    function previewWithdraw(uint256 assets) external view returns (uint256);

    /**
     * @dev Burns shares from owner and send exactly assets token from the vault to receiver.
     * Emits a {Withdraw} event.
     * Should round UP for EIP4626.
     */
    function withdraw(
        uint256 assets,
        address receiver,
        address owner
    ) external returns (uint256);

    /**
     * @dev The maximum amount of shares that can be redeemed from the owner balance through a redeem call.
     */
    function maxRedeem(address owner) external view returns (uint256);

    /**
     * @dev Simulates the effects of their redeemption at the current block.
     * Per EIP4626, should round DOWN.
     */
    function previewRedeem(uint256 shares) external view returns (uint256);

    /**
     * @dev Redeems a specific number of shares from owner and send assets of underlying token from the vault to receiver.
     * Emits a {Withdraw} event.
     * Per EIP4626, should round DOWN.
     */
    function redeem(
        uint256 shares,
        address receiver,
        address owner
    ) external returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import "./IServiceConfigurationV3.sol";
import "../interfaces/IVault.sol";

/**
 * @title An enum capturing the various states a Loan may be in.
 */
enum ILoanLifeCycleState {
    Requested,
    Canceled,
    Funded,
    Matured,
    Active,
    Settled
}

enum ILoanTransitionState {
    Created /* RequestedLoan */,
    ApprovedForDeposits /* RequestedLoan */,
    TransitioningFundsIn /* RequestedLoan */,
    AccruingInterest /* ActiveLoan */,
    RedemptionsClosed /* ActiveLoan */,
    TransitioningFundsOut /* MaturedLoan */,
    RedemptionsReleased /* Settled loan */
}

struct ILoanCompleteState {
    address loanAddr;
    address borrowerAddr;
    address fundingVaultAddr;
    address poolAddr;
    uint256 state;
    uint256 transitionState;
    uint256 durationDays;
    uint256 principal;
    uint256 startingPrincipal;
    uint256 interest;
    uint256 indicativeInterest;
    uint256 originationFee;
    uint256 indicativeApr;
    uint256 finalizedApr;
    uint256 exchangeRateAtDeposit;
    uint256 exchangeRateAtMaturity;
    uint256 fundingVaultBalance;
    uint256 assetsRolloverToNextLoan;
    uint256 assetsToReturnToPool;
    uint256 assetsFromPool;
    uint256 accrualStartDayTimestamp;
    uint256 accrualStartTimestamp;
    uint256 transferInWindowDurationDays;
    uint256 transferOutWindowDurationDays;
    uint256 depositClosingTimestamp;
    uint256 redemptionRequestClosingTimestamp;
    uint256 maturingTimestamp;
    uint256 redemptionAvailableTimestamp;
    ILoanRolloverAccounting rolloverAccounting;
    bool canRequestRedemption;
}

/**
 * @title The various Loan terms.
 */
struct ILoanSettings {
    uint256 principal;
    uint256 indicativeApr;
    uint256 finalizedApr;
    uint256 durationDays;
    uint256 dropDeadTimestamp;
    uint256 originationBps;
    uint256 accrualStartDayTimestamp;
    uint256 transferInWindowDurationDays;
    uint256 transferOutWindowDurationDays;
    address priorLoan;
    uint256 startingPrincipal;
}

struct ILoanRolloverAccounting {
    uint256 totalSupply;
    uint256 assetsFromPool;
    uint256 assetsFromPriorLoan;
    uint256 assetToReturnToPool;
    uint256 exchangeRateAtDeposit;
    uint256 exchangeRateAtMaturity;
}

/**
 * @title The primary interface for Perimeter loans.
 */
interface ILoan {
    /**
     * @dev Emitted when loan is funded.
     */
    event LoanFunded(address asset, uint256 amount);

    /**
     * @dev Emitted when a Loan's lifecycle state transitions
     */
    event LifeCycleStateTransition(ILoanLifeCycleState state);

    function getRolloverAccounting()
        external
        view
        returns (ILoanRolloverAccounting memory);

    function approve() external;

    function canRequestRedemption() external view returns (bool);

    function inDepositWindow() external view returns (bool);

    function inInitiateRolloverWindow() external view returns (bool);

    function exchangeRateAtDeposit() external view returns (uint256);

    function exchangeRateAtMaturity() external view returns (uint256);

    function assetsRolloverToNextLoan() external view returns (uint256);

    function assetsFromPool() external view returns (uint256);

    function assetsToReturnToPool() external view returns (uint256);

    function accrualStartTimestamp() external view returns (uint256);

    function accrualStartDayTimestamp() external view returns (uint256);

    function transferInWindowDurationDays() external view returns (uint256);

    function transferOutWindowDurationDays() external view returns (uint256);

    function depositClosingTimestamp() external view returns (uint256);

    function earlyRedeemRequestClosingTimestamp()
        external
        view
        returns (uint256);

    function redemptionRequestClosingTimestamp()
        external
        view
        returns (uint256);

    function maturingTimestamp() external view returns (uint256);

    function redemptionAvailableTimestamp() external view returns (uint256);

    /**
     * @dev Current Loan lifecycle state.
     */
    function state() external view returns (ILoanLifeCycleState);

    function transitionState() external view returns (ILoanTransitionState);

    /**
     * @dev The loan's borrower.
     */
    function borrower() external view returns (address);

    /**
     * @dev The pool associated with a loan.
     */
    function pool() external view returns (address);

    /**
     * @dev The factory that created the loan.
     */
    function factory() external view returns (address);

    /**
     * @dev A timestamp that controls when the loan can be dissolved
     */
    function dropDeadTimestamp() external view returns (uint256);

    /**
     * @dev Amount expected in each payment
     */
    function interest() external view returns (uint256);

    function indicativeInterest() external view returns (uint256);

    function rolloverMaturedLoan() external;

    function rolloverAndFinalizeApr(uint256 apr) external;

    function rolloverAllocation(
        uint256 assetsRolloverToNextLoan_,
        uint256 assetToReturnToPool_
    ) external;

    function completeRolloverNetPayment()
        external
        returns (
            uint256 feeVaultAmount,
            uint256 assetsReturnedToPool,
            uint256 interestAccrued
        );

    function fundRollover(
        uint256 assetsFromPool,
        uint256 assetsFromPriorLoan,
        uint256 totalSupply,
        address priorLoan
    ) external returns (ILoanLifeCycleState);

    function reschedule(
        uint256 accrualStartDayTimestamp_,
        uint256 transferInWindowDurationDays_,
        uint256 transferOutWindowDurationDays_,
        uint256 durationDays_
    ) external;

    /**
     * @dev When the loan was created.
     */
    function createdAt() external returns (uint256);

    /**
     * @dev Duration of the loan, after which the principal must be returned.
     */
    function durationDays() external view returns (uint256);

    /**
     * @dev Interest rate for the loan.
     */
    function finalizedApr() external view returns (uint256);

    function indicativeApr() external view returns (uint256);

    function originationFee() external view returns (uint256);

    /**
     * @dev Amount of loan principal.
     */
    function principal() external view returns (uint256);

    function startingPrincipal() external view returns (uint256);

    /**
     * @dev Address of the loan's funding vault, which holds liquidity transferred from the pool.
     */
    function fundingVault() external view returns (IVault);

    /**
     * @dev Liquidity asset of the loan or pool.
     */
    function liquidityAsset() external view returns (address);

    /**
     * @dev Address of the global service configuration.
     */
    function serviceConfiguration()
        external
        view
        returns (IServiceConfigurationV3);

    function repayEarlyWithdraw(
        uint256 principal,
        uint256 assetReduction
    ) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import "./IERC4626.sol";
import "./IServiceConfiguration.sol";
import "../controllers/interfaces/IPoolController.sol";

import "./IPoolBase.sol";
import "../controllers/interfaces/IWithdrawController.sol";

import "./ILoan.sol";
import "../interfaces/IPoolAccessControl.sol";

/* Paired with rolloverTiming field */
enum IPoolRolloverState {
    EarlyRolloverInitiate, // 0 accept Deposits and WithdrawRequests, no early withdraws) transitionTiming = time to expected rollover */
    RolloverInitiate, // 1 no deposits or withdrawRequests)  transitionTiming = time left of  expected rollover */
    LateRolloverInitiate, // 2  transitionTiming = time expected rollover pastDue */
    EarlyRolloverFinalize, // 3 Requested
    RolloverFinalize, // 4 Requested
    LateRolloverFinalize, // 5 Requested
    EarlyRepayWithdrawsAndFees, // 6 Matured loan
    RepayWithdrawsAndFees, // 7 Matured loan
    LateRepayWithdrawsAndFees, // 8 Matured loan
    EarlyReleaseRedemptions, // 9 Matured loan
    ReleaseRedemptions, // 10 Matured loan
    LateReleaseRedemptions, // 11 Matured loan
    CreateNextLoan, // 12
    ApproveNextLoan, //13
    LateApproveNextLoan, //14
    LoanNeedsRescheduling, //15
    NotRollingOver, //16
    InvalidState // 17
}

enum IPoolRolloverActor {
    PoolAdmin, // 0
    BorrowerManager, //1
    BorrowerWallet, //2
    Investor // 3
}

struct IPoolAccountings {
    uint256 totalAvailableAssets;
    uint256 outstandingLoanPrincipals;
    uint256 totalAssetsDeposited;
    uint256 totalAssetsWithdrawn;
}

struct IPoolRolloverStateStruct {
    IPoolRolloverState rolloverState;
    IPoolRolloverActor rolloverActor;
    uint256 rolloverTimeToActionWindow;
    uint256 rolloverTimeLeftInActionWindow;
    uint256 rolloverTimePastActionWindow;
}

struct IPoolConfigurationState {
    address poolAddr;
    address admin;
    address poolController;
    address feeVault;
    address withdrawController;
    string name;
    string symbol;
    address borrowerManager;
    address borrowerWallet;
    address borrowerVault;
    uint256 maxCapacity;
    uint256 closeOfBusinessTime;
    uint256 poolEndDate;
    address liquidityPoolAssetAddr;
}
struct IRedemptionState {
    address[] redemptionLenders;
    uint256[] requestedShares;
    uint256[] redeemableShares;
}
struct IPoolOverviewState {
    address poolAddr;
    address[] settledLoans;
    uint8 state;
    uint8 rolloverState;
    uint8 rolloverActor;
    uint256 rolloverTimeToActionWindow;
    uint256 rolloverTimeLeftInActionWindow;
    uint256 rolloverTimePastActionWindow;
    uint256 totalAvailableAssets;
    uint256 totalAvailableSupply;
    uint256 currentExpectedInterest;
    uint256 liquidityPoolAssets;
    uint256 totalAssets;
    uint256 totalOutstandingLoanPrincipal;
    uint256 totalAssetsDeposited;
    uint256 totalAssetsWithdrawn;
    uint256 totalRequestedShares;
    uint256 totalRedeemableShares;
    uint256 totalWithdrawableAssets;
    uint256 totalRequestedAssets;
    uint256 feeVaultBalance;
    uint256 borrowerVaultBalance;
    uint256 borrowerWalletBalance;
    uint256 poolBalance;
    uint256 exchangeRateAtMaturity;
    ILoanCompleteState requestedLoanState;
    ILoanCompleteState activeLoanState;
    ILoanCompleteState maturedLoanState;
    ILoanCompleteState createdLoanState;
    IRedemptionState redemptionState;
    uint256 totalEarlyRequestedShares;
    uint256 totalEarlyRequestedAssets;
    uint256 totalEarlyAcceptedShares;
    uint256 totalEarlyAcceptedAssets;
}

struct IPoolAccountState {
    address poolAddr;
    address accountAddr;
    uint256 balance;
    uint256 maxWithdrawRequest;
    uint256 maxRedeemRequest;
    uint256 maxWithdraw;
    uint256 maxRedeem;
    uint256 requestedSharesOf;
    uint256 redeemableSharesOf;
    uint256 requestedAssetsOf;
    uint256 withdrawableAssetsOf;
    uint256 earlyRequestedSharesOf;
    uint256 earlyRequestedAssetsOf;
    uint256 earlyAcceptedSharesOf;
    uint256 earlyAcceptedAssetsOf;
}

struct PoolAddressList {
    address liquidityAsset;
    address poolAdmin;
    address serviceConfiguration;
    address withdrawControllerFactory;
    address poolControllerFactory;
    address vaultFactory;
    address poolAccessControlFactory;
}

/**
 * @title The interface for liquidity pools.
 */
interface IPool is IPoolBase {
    event Deposit(
        address indexed sender,
        address indexed owner,
        uint256 assets,
        uint256 shares
    );

    event Withdraw(
        address indexed sender,
        address indexed receiver,
        address indexed owner,
        uint256 assets,
        uint256 shares
    );

    /**
     * @dev The PoolController contract
     */
    function poolController() external view returns (IPoolController);

    /**
     * @dev The WithdrawController contract
     */
    function withdrawController() external view returns (IWithdrawController);

    /**
     * @dev The current configurable pool settings.
     */
    function settings()
        external
        view
        returns (IPoolConfigurableSettings calldata settings);

    /**
     * @dev The current pool state.
     */
    function state() external view returns (IPoolLifeCycleState);

    /**
     * @dev The pool accounting variables;
     */
    function accountings() external view returns (IPoolAccountings memory);

    function closeOfBusinessTime() external view returns (uint256);

    /**
     * @dev Callback from the pool controller when the pool is activated
     */
    function onActivated() external;

    function initiateRollover(address loan, address priorLoan) external;

    function completeRolloverNetPayment(address) external;

    function withdrawFeeVault(uint256 amount, address receiver) external;

    function loanCreated(address loan) external;

    function reschedule(
        address loan,
        uint256 accrualStartDayTimestamp,
        uint256 transferInWindowDurationDays,
        uint256 transferOutWindowDurationDays,
        uint256 durationDays
    ) external;

    function redemptionState()
        external
        view
        returns (IRedemptionState memory _redemptionState);

    function releaseRolloverRedemption(address owner) external;

    function exchangeRateAtMaturity()
        external
        view
        returns (uint256 _exchangeRateAtMaturity);

    function exchangeRateAtDeposit() external view returns (uint256);

    /**
     * @dev Calculate the total amount of underlying assets held by the vault,
     * excluding any assets due for withdrawal.
     */
    function totalAvailableAssets() external view returns (uint256);

    /**
     * @dev The total available supply that is not marked for withdrawal
     */
    function totalAvailableSupply() external view returns (uint256);

    /**
     * @dev The accrued interest at the current block.
     */
    function currentExpectedInterest() external view returns (uint256 interest);

    function rolloverAndFinalizeApr(uint256 _apr) external;

    /*//////////////////////////////////////////////////////////////
                       LOAN SET OPERATIONS
//////////////////////////////////////////////////////////////*/

    function approveLoanForPool(address loan) external;

    function createdLoan() external view returns (address);

    function activeLoan() external view returns (address);

    function requestedLoan() external view returns (address);

    function maturedLoan() external view returns (address);

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

    /*//////////////////////////////////////////////////////////////
                         Early Withdraw
   //////////////////////////////////////////////////////////////*/

    function requestEarlyRedeem(uint256 shares) external;

    function acceptEarlyRedeemRequest(
        address investorAddr
    ) external returns (uint256 principal);

    function repayEarlyWithdraw(
        address investorAddr,
        uint256 amount
    )
        external
        returns (
            uint256 principal,
            uint256 repayment,
            uint256 redeemedShares,
            uint256 fees
        );

    function deposit(
        uint256 assets,
        address lender
    ) external returns (uint256 shares);

    function convertToAssets(
        uint256 shares
    ) external view returns (uint256 assets);

    function convertToShares(
        uint256 assets
    ) external view returns (uint256 shares);

    function maxWithdraw(address owner) external view returns (uint256 assets);

    function maxRedeem(address owner) external view returns (uint256 maxShares);

    function totalAssets() external view returns (uint256);

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

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

/**
 * @title The interface for controlling access to Pools
 */
interface IPoolAccessControl {
    /**
     * @dev Check if an address is allowed as a participant in the pool
     * @param addr The address to verify
     * @return whether the address is allowed as a participant
     */
    function isAllowed(address addr) external view returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import "./IRequestWithdrawable.sol";

import "./IServiceConfigurationV3.sol";
import "./IPoolAccessControl.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
enum IPoolType {
    TermPool,
    FlexRatePool
}

interface IPoolBase is IERC20Upgradeable, IRequestWithdrawable {
    function poolType() external view returns (IPoolType);

    function liquidityAssetAddr() external view returns (address);

    function version() external view returns (uint16);

    /**
     * @dev The ServiceConfiguration.
     */
    function serviceConfiguration()
        external
        view
        returns (IServiceConfigurationV3);

    /**
     * @dev The admin for the pool.
     */
    function admin() external view returns (address);

    function borrowerManagerAddr() external view returns (address);

    function borrowerWalletAddr() external view returns (address);

    /**
     * @dev The activation timestamp of the pool.
     */
    function activatedAt() external view returns (uint256);

    function poolAccessControl() external view returns (IPoolAccessControl);

    /**
     * @dev The sum of all assets available in the liquidity pool, excluding
     * any assets that are marked for withdrawal.
     */
    function liquidityPoolAssets() external view returns (uint256);

    function isPermittedLender(address) external view returns (bool);

    function maxDeposit(address owner) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

/**
 * @title The interface for interacting with Terms of Service Acceptance Registry.
 */
interface IPoolRegistry {
    function version() external pure returns (uint16);

    function addPool(address pool) external;

    function pools() external returns (address[] memory);

    function updatePoolData(address poolAddr) external;

    function isPoolRegistered(address poolAddr) external view returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

/**
 * @title Interface that exposes methods to request withdraws / redeems.
 * @dev Terminology and design informed to complement ERC4626.
 */
interface IRequestWithdrawable {
    /**
     * @dev Returns the maximum number of `shares` that can be
     * requested to be redeemed from the owner balance with a single
     * `requestRedeem` call in the current block.
     *
     * Note: This is equivalent of EIP-4626 `maxRedeem`
     */
    function maxRedeemRequest(
        address owner
    ) external view returns (uint256 maxShares);

    /**
     * @dev Returns the maximum amount of underlying `assets` that can be
     * requested to be withdrawn from the owner balance with a single
     * `requestWithdraw` call in the current block.
     *
     * Note: This is equivalent of EIP-4626 `maxWithdraw`
     */
    function maxWithdrawRequest(
        address owner
    ) external view returns (uint256 maxAssets);

    /**
     * @dev Simulate the effects of a redeem request at the current block.
     * Returns the amount of underlying assets that would be requested if this
     * entire redeem request were to be processed at the current block.
     *
     * Note: This is equivalent of EIP-4626 `previewRedeem`
     */
    function previewRedeemRequest(
        uint256 shares
    ) external view returns (uint256 assets);

    /**
     * @dev Simulate the effects of a withdrawal request at the current block.
     * Returns the amount of `shares` that would be burned if this entire
     * withdrawal request were to be processed at the current block.
     *
     * Note: This is equivalent of EIP-4626 `previewWithdraw`
     */
    function previewWithdrawRequest(
        uint256 assets
    ) external view returns (uint256 shares);

    /**
     * @dev Submits a withdrawal request, incurring a fee.
     */
    function requestRedeem(uint256 shares) external returns (uint256 assets);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

struct SerivceAddressList {
    address[] liquidityAssets;
    address tosAcceptanceRegistry;
    address loanFactory;
    address poolFactoryAddress;
    address queryLibAddress;
    address poolLibAddress;
    address loanLibAddress;
    address poolControllerFactoryAddress;
    address withdrawControllerFactoryAddress;
    address vaultFactoryAddress;
    address poolAccessControlFactoryAddress;
}

/**
 * @title The protocol global Service Configuration
 */
interface IServiceConfiguration {
    /**
     * @dev Emitted when an address is changed.
     */
    event AddressSet(bytes32 which, address addr);

    /**
     * @dev Emitted when a liquidity asset is set.
     */
    event LiquidityAssetSet(address addr, bool value);

    /**
     * @dev Emitted when a parameter is set.
     */
    event ParameterSet(bytes32, uint256 value);

    /**
     * @dev Emitted when the protocol is paused.
     */
    event ProtocolPaused(bool paused);

    /**
     * @dev Emitted when a loan factory is set
     */
    event LoanFactorySet(address indexed factory);
    event PoolFactorySet(address indexed factory);
    event QueryLibSet(address indexed factory);
    event LoanLibSet(address indexed factory);
    event PoolLibSet(address indexed factory);
    event PoolAdminWalletSet(address indexed factory);

    /**
     * @dev Emitted when the TermsOfServiceRegistry is set
     */
    event TermsOfServiceRegistrySet(address indexed registry);

    /**
     * @dev checks if a given address has the Operator role
     */
    function isOperator(address addr) external view returns (bool);

    /**
     * @dev checks if a given address has the Deployer role
     */
    function isDeployer(address addr) external view returns (bool);

    /**
     * @dev checks if a given address has the Deployer role
     */
    function isPoolAdmin(address addr) external view returns (bool);

    /**
     * @dev checks if a given address has the Deployer role
     */
    function isBorrower(address addr) external view returns (bool);

    /**
     * @dev Whether the protocol is paused.
     */
    function paused() external view returns (bool);

    /**
     * @dev Whether an address is supported as a liquidity asset.
     */
    function isLiquidityAsset(address addr) external view returns (bool);

    /**
     * @dev Address of the Terms of Service acceptance registry.
     */
    function tosAcceptanceRegistry() external view returns (address);

    /**
     * @dev Sets whether a loan factory is valid
     * @param addr Address of loan factory
     */
    function setLoanFactory(address addr) external;

    function setPoolFactory(address addr) external;

    function setQueryLib(address addr) external;

    function setPoolLib(address addr) external;

    function setLoanLib(address addr) external;

    function getLoanFactory() external view returns (address);

    function getPoolFactory() external view returns (address);

    function getQueryLib() external view returns (address);

    function getLoanLib() external view returns (address);

    function getPoolLib() external view returns (address);

    function setPoolAdminWallet(address addr) external;

    function getPoolAdminWallet() external view returns (address);

    /**
     * @dev Sets the ToSAcceptanceRegistry for the protocol
     * @param addr Address of registry
     */
    function setToSAcceptanceRegistry(address addr) external;

    /**
     * @dev Sets supported liquidity assets for the protocol. Callable by the operator.
     * @param addr Address of liquidity asset
     * @param value Whether supported or not
     */
    function setLiquidityAsset(address addr, bool value) external;

    function getServiceAddressList()
        external
        view
        returns (SerivceAddressList memory setLoanFactoryerivceAddressList);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import "./IServiceConfiguration.sol";

struct SerivceAddressListV3 {
    address[] liquidityAssets;
    address tosAcceptanceRegistry;
    address loanFactory;
    address poolFactoryAddress;
    address poolFactoryFlexAddress;
    address queryLibAddress;
    address poolLibAddress;
    address poolLibFlexAddress;
    address loanLibAddress;
    address poolControllerFactoryAddress;
    address withdrawControllerFactoryAddress;
    address vaultFactoryAddress;
    address poolAccessControlFactoryAddress;
    address poolControllerFactoryFlexAddress;
    address withdrawDepositControllerFactoryFlexAddress;
    address poolRegistryAddress;
}

enum IFactoryType {
    PoolFactory,
    LoanFactory,
    VaultFactory,
    PoolFactoryFlex,
    PoolControllerFactory,
    PoolLibFlex,
    PoolControllerFactoryFlex,
    WithdrawDepositControllerFactoryFlex,
    WithdrawControllerFactory,
    PoolAccessControlFactory
}
struct LegacyFactoryStruct {
    IFactoryType factoryType;
    address factoryAddress;
}

/**
 * @title The protocol global Service Configuration
 */
interface IServiceConfigurationV3 is IServiceConfiguration {
    event PoolFactoryFlexSet(address indexed factory);

    event PoolLibFlexSet(address indexed factory);

    event PoolRegistrySet(address indexed factory);

    function version() external pure returns (uint16);

    function isAutomation(address addr) external view returns (bool);

    function setPoolFactoryFlex(address addr) external;

    function setPoolLibFlex(address addr) external;

    function setPoolRegistry(address addr) external;

    function getPoolRegistry() external view returns (address);

    function getPoolFactoryFlex() external view returns (address);

    function getPoolLibFlex() external view returns (address);

    function getLegacyFactories()
        external
        view
        returns (LegacyFactoryStruct[] memory legacyFactories);

    function getServiceAddressListV3()
        external
        view
        returns (SerivceAddressListV3 memory addressList);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";

/**
 * @title Interface for the Vault.
 * @dev Vaults simply hold a balance, and allow withdrawals by the Vault's owner.
 */
interface IVault {
    /**
     * @dev Emitted on ERC20 withdrawals
     */
    event WithdrewERC20(
        address indexed asset,
        uint256 amount,
        address indexed receiver
    );

    /**
     * @dev Emitted on ERC721 withdrawals
     */
    event WithdrewERC721(
        address indexed asset,
        uint256 tokenId,
        address receiver
    );

    /**
     * @dev Withdraws ERC20 of a given asset
     */
    function withdrawERC20(
        address asset,
        uint256 amount,
        address receiver
    ) external;

    /**
     * @dev Withdraws ERC20 of a given asset
     */
    function withdrawERC20ToBorrowerWallet(
        address asset,
        uint256 amount
    ) external;

    function payFees(address asset, uint256 amount) external;

    function repayLoan(address asset, uint256 amount) external;

    /**
     * @dev Withdraws ERC721 with specified tokenId
     */
    function withdrawERC721(
        address asset,
        uint256 tokenId,
        address receiver
    ) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import {IERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import {IERC721} from "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {SafeMath} from "@openzeppelin/contracts/utils/math/SafeMath.sol";

import "../interfaces/ILoan.sol";
import "../interfaces/IPool.sol";
import "../interfaces/IServiceConfigurationV3.sol";
import "../interfaces/IVault.sol";

library LoanLib {
    using SafeERC20 for IERC20;
    using SafeMath for uint256;

    uint256 public constant RAY = 10 ** 27;

    function version() public pure returns (uint16) {
        return 256 * 1 + 0;
    }

    /**
     * @dev Emitted when loan is funded.
     */
    event LoanFunded(address asset, uint256 amount);

    /**
     * @dev Emitted when loan principal is repaid ahead of schedule.
     */
    event LoanPrincipalPaid(
        address asset,
        uint256 amount,
        address fundingVault
    );

    /**
     * @dev Emitted when a loan payment is made.
     */
    event LoanPaymentMade(address pool, address liquidityAsset, uint256 amount);

    /**
     * @dev See ILoan
     */

    /**
     * @dev Validate Loan constructor arguments
     */
    function validateLoan(
        IServiceConfigurationV3 config,
        IPool pool,
        ILoanSettings memory loanSettings,
        address liquidityAsset
    ) external view {
        require(
            loanSettings.durationDays > 0,
            "LoanLib: Duration cannot be zero"
        );

        require(
            config.isLiquidityAsset(liquidityAsset),
            "LoanLib: Liquidity asset not allowed"
        );
        require(
            pool.asset() == liquidityAsset,
            "LoanLib: Not allowed asset for pool"
        );
    }

    /**
     * @dev Called on loan fundings, pulls funds from the pool into the
     * loan's funding vault.
     */
    function fundRolloverLoan(
        address liquidityAsset,
        IVault borrowerVault,
        uint256 amount
    ) public returns (ILoanLifeCycleState) {
        if (amount > 0) {
            IERC20(liquidityAsset).safeTransferFrom(
                msg.sender,
                address(borrowerVault),
                amount
            );
        }

        emit LoanFunded(liquidityAsset, amount);
        return ILoanLifeCycleState.Funded;
    }

    function previewOriginationFee(
        ILoanSettings calldata settings,
        uint256 scalingValue
    ) public pure returns (uint256) {
        return
            settings
                .startingPrincipal
                .mul(settings.originationBps)
                .mul(settings.durationDays.mul(scalingValue).div(360))
                .div(RAY)
                .div(10000);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {EnumerableSet} from "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {SafeMath} from "@openzeppelin/contracts/utils/math/SafeMath.sol";

import "../interfaces/ILoan.sol";
import "../interfaces/IPool.sol";
import "../interfaces/IPoolRegistry.sol";
import "../interfaces/ILoan.sol";
import "../interfaces/IServiceConfigurationV3.sol";
import "../interfaces/IVault.sol";
import "../factories/LoanFactory.sol";

/**
 * @title Collection of functions used by the Pool and PoolController.
 */
library PoolLib {
    using SafeERC20 for IERC20;
    using SafeMath for uint256;
    using EnumerableSet for EnumerableSet.AddressSet;

    uint256 public constant RAY = 10 ** 27;

    /**
     * @dev See IERC4626
     */
    event Deposit(
        address indexed sender,
        address indexed owner,
        uint256 assets,
        uint256 shares
    );

    /**
     * @dev See IPoolController
     */
    event PoolSettingsUpdated();

    function version() public pure returns (uint16) {
        return 256 * 1 + 0;
    }

    /**
     * @dev Divide two numbers and round the result up
     */
    function divideCeil(
        uint256 lhs,
        uint256 rhs
    ) internal pure returns (uint256) {
        return (lhs + rhs - 1) / rhs;
    }

    /**
     * @dev Computes the exchange rate for converting assets to shares
     * @param input The input to the conversion
     * @param numerator Numerator of the conversion rate
     * @param denominator Denominator of the conversion rate
     * @param roundUp Whether it should be rounded up or down.
     * @return output The converted amount
     */
    function calculateConversion(
        uint256 input,
        uint256 numerator,
        uint256 denominator,
        bool roundUp
    ) public pure returns (uint256 output) {
        if (numerator == 0 || denominator == 0) {
            return input;
        }

        uint256 rate = numerator.mul(RAY).div(denominator);
        if (roundUp) {
            return divideCeil(rate.mul(input), RAY);
        } else {
            return rate.mul(input).div(RAY);
        }
    }

    /**
     * @dev Private method to determine if a pool is solvent given
     * the parameters.
     *
     * If the pool has assets, it is solvent. If no assets are available,
     * but no shares have been issued, it is solvent. Otherwise, it is insolvent.
     */
    function isSolvent(
        uint256 totalAssets,
        uint256 totalShares
    ) private pure returns (bool) {
        return totalAssets > 0 || totalShares == 0;
    }

    /**
     * @dev Calculates total assets held by Vault (including those marked for withdrawal)
     * @param asset Amount of total assets held by the Vault
     * @param vault Address of the ERC4626 vault
     * @param outstandingLoanPrincipals Sum of all outstanding loan principals
     * @return totalAssets Total assets
     */
    function calculateTotalAssets(
        address asset,
        address vault,
        uint256 outstandingLoanPrincipals,
        uint256 currentExpectedInterest
    ) public view returns (uint256 totalAssets) {
        totalAssets =
            IERC20(asset).balanceOf(vault) +
            outstandingLoanPrincipals +
            currentExpectedInterest;
    }

    /**
     * @dev Calculates total assets held by Vault (excluding marked for withdrawal)
     * @param asset Amount of total assets held by the Vault
     * @param vault Address of the ERC4626 vault
     * @param outstandingLoanPrincipals Sum of all outstanding loan principals
     * @param withdrawableAssets Sum of all withdrawable assets
     * @return totalAvailableAssets Total available assets (excluding marked for withdrawal)
     */
    function calculateTotalAvailableAssets(
        address asset,
        address vault,
        uint256 outstandingLoanPrincipals,
        uint256 withdrawableAssets,
        address loanAddr
    ) external view returns (uint256 totalAvailableAssets) {
        if (loanAddr != address(0)) {
            ILoan loan = ILoan(loanAddr);

            totalAvailableAssets =
                IERC20(asset).balanceOf(vault) +
                //loan.outstandingPrincipal() +
                outstandingLoanPrincipals +
                loan.interest() -
                withdrawableAssets;
        } else {
            totalAvailableAssets =
                calculateTotalAssets(
                    asset,
                    vault,
                    outstandingLoanPrincipals,
                    0
                ) -
                withdrawableAssets;
        }
    }

    /**
     * @dev Calculates total shares held by Vault (excluding marked for redemption)
     * @param vault Address of the ERC4626 vault
     * @param redeemableShares Sum of all withdrawable assets
     * @return totalAvailableShares Total redeemable shares (excluding marked for redemption)
     */
    function calculateTotalAvailableShares(
        address vault,
        uint256 redeemableShares
    ) external view returns (uint256 totalAvailableShares) {
        totalAvailableShares = IERC20(vault).totalSupply() - redeemableShares;
    }

    /**
     * @dev Calculates the max deposit allowed in the pool
     * @param poolLifeCycleState The current pool lifecycle state
     * @param poolMaxCapacity Max pool capacity allowed per the pool settings
     * @param totalAvailableAssets Sum of all pool assets (excluding marked for withdrawal)
     * @return Max deposit allowed
     */
    function calculateMaxDeposit(
        IPoolLifeCycleState poolLifeCycleState,
        uint256 poolMaxCapacity,
        uint256 totalAvailableAssets
    ) external pure returns (uint256) {
        uint256 remainingCapacity = poolMaxCapacity > totalAvailableAssets
            ? poolMaxCapacity - totalAvailableAssets
            : 0;
        return
            poolLifeCycleState == IPoolLifeCycleState.Active
                ? remainingCapacity
                : 0;
    }

    /**
     * @dev Executes a deposit into the pool
     * @param asset Pool liquidity asset
     * @param vault Address of ERC4626 vault
     * @param lender Address of receiver of shares
     * @param assets Amount of assets being deposited
     * @param shares Amount of shares being minted
     * @param maxDeposit Max allowed deposit into the pool
     * @param mint A pointer to the mint function
     * @return The amount of shares being minted
     */
    function executeDeposit(
        address asset,
        address vault,
        address lender,
        uint256 assets,
        uint256 shares,
        uint256 maxDeposit,
        function(address, uint256) mint,
        IPoolAccountings storage accountings
    ) internal returns (uint256) {
        require(shares > 0, "Pool: 0 deposit not allowed");
        require(assets <= maxDeposit, "Pool: Exceeds max deposit");

        IERC20(asset).safeTransferFrom(msg.sender, vault, assets);
        mint(lender, shares);

        emit Deposit(msg.sender, lender, assets, shares);
        accountings.totalAvailableAssets += assets;
        accountings.totalAssetsDeposited += assets;
        return shares;
    }

    /*//////////////////////////////////////////////////////////////
                    Withdrawal Request Methods
    //////////////////////////////////////////////////////////////*/

    function calculateRollover(
        address priorLoan,
        address _liquidityAsset,
        address pool,
        uint256 outstandingLoanPrincipals_
    )
        external
        view
        returns (
            uint256 outstandingLoanPrincipals,
            uint256 assetsFromPool,
            uint256 assetsFromPriorToNextLoan,
            uint256 totalSupply,
            uint256 assetToAReturnToPool
        )
    {
        require(
            address(IPool(pool).poolController()) != address(0) &&
                msg.sender == address(IPool(pool).poolController()),
            "PoolLib: caller is not pool controller"
        );
        if (priorLoan == address(0)) {
            outstandingLoanPrincipals = IERC20(_liquidityAsset).balanceOf(pool);
            require(
                IPool(pool).totalAvailableSupply() > 0,
                "No Funds to start loan"
            );

            assetsFromPool = outstandingLoanPrincipals;
            assetsFromPriorToNextLoan = 0;
            totalSupply = IPool(pool).totalAvailableSupply();
            assetToAReturnToPool = 0;
        } else {
            uint256 requestedAssets = (
                IPool(pool).withdrawController().totalRequestedShares().mul(
                    IPool(pool).exchangeRateAtMaturity()
                )
            ).div(1e18);
            uint256 poolBalance = IERC20(_liquidityAsset).balanceOf(pool);
            totalSupply =
                IPool(pool).totalAvailableSupply() -
                IPool(pool).withdrawController().totalRequestedShares();

            if (requestedAssets < poolBalance) {
                assetsFromPool = poolBalance - requestedAssets;
                assetsFromPriorToNextLoan =
                    ILoan(priorLoan).principal() +
                    ILoan(priorLoan).interest();

                assetToAReturnToPool = 0;
                outstandingLoanPrincipals =
                    outstandingLoanPrincipals_ +
                    assetsFromPool;
            } else {
                assetsFromPool = 0;
                assetsFromPriorToNextLoan =
                    poolBalance +
                    ILoan(priorLoan).principal() +
                    ILoan(priorLoan).interest() -
                    requestedAssets;

                assetToAReturnToPool =
                    requestedAssets -
                    IERC20(_liquidityAsset).balanceOf(pool);

                outstandingLoanPrincipals =
                    outstandingLoanPrincipals_ +
                    IERC20(_liquidityAsset).balanceOf(pool);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import {SafeMath} from "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "./interfaces/ILoan.sol";
import "./interfaces/IPool.sol";
import "./interfaces/IServiceConfigurationV3.sol";
import "./interfaces/IVault.sol";
import "./factories/interfaces/IVaultFactory.sol";
import "./libraries/LoanLib.sol";
import "./upgrades/BeaconImplementation.sol";
import "./Pool.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

import "./interfaces/IPoolAccessControl.sol";

/**
 * @title Perimeter Loan contract.
 */
contract Loan is ILoan, BeaconImplementation {
    using SafeMath for uint256;

    using SafeERC20 for IERC20;

    IServiceConfigurationV3 private _serviceConfiguration;
    /**
     * @dev The reference to the access control contract
     */
    IPoolAccessControl public poolAccessControl;

    address private _factory;
    ILoanLifeCycleState private _state = ILoanLifeCycleState.Requested;
    ILoanTransitionState private _transitionState =
        ILoanTransitionState.Created;
    address private _borrower;
    address private _pool;
    IVault public fundingVault;
    uint256 public createdAt;
    address public liquidityAsset;
    uint256 public interest;
    uint256 public indicativeInterest;
    uint256 public originationFee;

    ILoanRolloverAccounting public rolloverAccounting;

    uint256 public accrualStartTimestamp;
    uint256 public depositClosingTimestamp;
    uint256 public redemptionRequestClosingTimestamp;
    uint256 public earlyRedeemRequestClosingTimestamp;
    uint256 public maturingTimestamp;
    uint256 public redemptionAvailableTimestamp;

    uint256 public _assetsRolloverToNextLoan;
    uint256 public _assetsToReturnToPool;

    ILoanSettings public settings;

    event FundsReclaimed(uint256 amount, address pool);

    event LoanScheduleViolation(
        ILoanTransitionState transitionState,
        uint256 timestamp,
        uint256 windowStart,
        uint256 windowEnd
    );

    /**
     * @dev Modifier that requires the protocol not be paused.
     */
    modifier onlyNotPaused() {
        require(
            IServiceConfigurationV3(_serviceConfiguration).paused() == false,
            "Loan: Protocol paused"
        );
        _;
    }

    /**
     * @dev Modifier that requires the Loan be in the given `state_`
     */
    modifier onlyLifeCycleState(ILoanLifeCycleState state_) {
        require(
            _state == state_,
            "Loan: FunctionInvalidAtThisILoanLifeCycleState"
        );
        _;
    }
    modifier onlyTransitionState(ILoanTransitionState transitionState_) {
        require(
            _transitionState == transitionState_,
            "Loan: FunctionInvalidAtThisILoanLifeCycleState"
        );
        _;
    }

    /**
     * @dev Modifier that requires `msg.sender` to be the pool. Loan assumes the pool has performed access checks
     */
    modifier onlyPool() {
        require(msg.sender == _pool, "Loan: caller is not pool");
        _;
    }

    /**
     * @dev Modifier that can be overriden by derived classes to enforce
     * access control.
     */
    modifier onlyPermittedBorrower() {
        require(
            poolAccessControl.isAllowed(msg.sender),
            "Loan: Only Permitted Borrower allowed"
        );
        _;
    }

    function version() public pure returns (uint16) {
        return 256 * 1 + 0;
    }

    function roundToDays(uint256 timestamp) public pure returns (uint256) {
        return timestamp.div(1 days).mul(1 days);
    }

    function inDepositWindow() external view override returns (bool) {
        return block.timestamp < depositClosingTimestamp;
    }

    function canRequestRedemption() external view override returns (bool) {
        return
            _transitionState == ILoanTransitionState.Created ||
            _transitionState == ILoanTransitionState.ApprovedForDeposits ||
            _transitionState == ILoanTransitionState.AccruingInterest;
    }

    function inInitiateRolloverWindow() external view override returns (bool) {
        return
            block.timestamp > depositClosingTimestamp &&
            block.timestamp < accrualStartTimestamp;
    }

    function initialize(
        address serviceConfiguration_,
        address factory_,
        address borrower_,
        address pool_,
        address liquidityAsset_,
        address vaultFactory,
        ILoanSettings memory settings_
    ) public virtual initializer {
        require(settings_.indicativeApr > 0, "Loan:  APR cannot be zero");
        require(settings_.durationDays > 0, "Loan:  Duration cannot be zero");
        require(
            settings_.transferInWindowDurationDays > 0,
            "Loan:  transferInWindowDurationDays cannot be zero"
        );
        require(
            settings_.transferOutWindowDurationDays > 0,
            "Loan:  transition cannot be zero"
        );
        require(
            settings_.accrualStartDayTimestamp >
                block.timestamp +
                    settings_.transferInWindowDurationDays *
                    (1 days),
            "Loan: accrualStartDayTimestamp must be greater than now plus transferInWindowDurationDays"
        );
        require(factory_ != address(0), "Loan:  Factory cannot be zero");
        require(pool_ != address(0), "Loan:  Factory cannot be zero");
        require(
            vaultFactory != address(0),
            "Loan:  VaultFactory cannot be zero"
        );
        require(
            borrower_ == IPool(pool_).borrowerManagerAddr(),
            "Loan:  Borrower must be pool borrower manager"
        );
        _serviceConfiguration = IServiceConfigurationV3(serviceConfiguration_);
        poolAccessControl = IPool(pool_).poolAccessControl();

        _factory = factory_;
        _borrower = borrower_;
        _pool = pool_;

        fundingVault = IVault(
            IVaultFactory(vaultFactory).createVault(
                address(this),
                IVaultType.FundingVault
            )
        );
        createdAt = block.timestamp;
        liquidityAsset = liquidityAsset_;
        settings = settings_;
        calculateSchedule();

        LoanLib.validateLoan(
            _serviceConfiguration,
            IPool(_pool),
            settings,
            liquidityAsset
        );
    }

    function calculateSchedule() internal {
        accrualStartTimestamp =
            roundToDays(settings.accrualStartDayTimestamp) +
            IPool(_pool).closeOfBusinessTime();
        depositClosingTimestamp =
            accrualStartTimestamp -
            settings.transferInWindowDurationDays *
            (1 days);

        redemptionRequestClosingTimestamp =
            accrualStartTimestamp +
            (settings.durationDays - settings.transferInWindowDurationDays) *
            (1 days);
        maturingTimestamp =
            accrualStartTimestamp +
            settings.durationDays *
            (1 days);
        redemptionAvailableTimestamp =
            accrualStartTimestamp +
            (settings.durationDays + settings.transferOutWindowDurationDays) *
            (1 days);
        earlyRedeemRequestClosingTimestamp =
            accrualStartTimestamp +
            (settings.durationDays -
                settings.transferInWindowDurationDays -
                settings.transferOutWindowDurationDays) *
            (1 days);
    }

    function reschedule(
        uint256 accrualStartDayTimestamp_,
        uint256 transferInWindowDurationDays_,
        uint256 transferOutWindowDurationDays_,
        uint256 durationDays_
    ) external override onlyPool onlyNotPaused {
        require(
            _state != ILoanLifeCycleState.Settled &&
                _state != ILoanLifeCycleState.Canceled,
            "Loan: can not be settled or canceled"
        );
        require(
            transferInWindowDurationDays_ > 0,
            "Loan:  transferInWindowDurationDays cannot be zero"
        );
        require(
            transferOutWindowDurationDays_ > 0,
            "Loan:  transferOutWindowDurationDays cannot be zero"
        );
        require(
            durationDays_ > 0,
            "Loan:  transferOutWindowDurationDays cannot be zero"
        );
        settings.accrualStartDayTimestamp = accrualStartDayTimestamp_;
        settings.transferInWindowDurationDays = transferInWindowDurationDays_;
        settings.transferOutWindowDurationDays = transferOutWindowDurationDays_;
        settings.durationDays = durationDays_;
        calculateSchedule();
    }

    function getRolloverAccounting()
        external
        view
        returns (ILoanRolloverAccounting memory)
    {
        return rolloverAccounting;
    }

    function approve()
        external
        override
        onlyPool
        onlyNotPaused
        onlyTransitionState(ILoanTransitionState.Created)
    {
        _transitionState = ILoanTransitionState.ApprovedForDeposits;
    }

    /**
     * @inheritdoc ILoan
     */
    function rolloverAllocation(
        uint256 assetsRolloverToNextLoan_,
        uint256 assetToReturnToPool_
    )
        external
        onlyPool
        onlyNotPaused
        onlyTransitionState(ILoanTransitionState.AccruingInterest)
        onlyLifeCycleState(ILoanLifeCycleState.Active)
    {
        _transitionState = ILoanTransitionState.RedemptionsClosed;
        _assetsRolloverToNextLoan = assetsRolloverToNextLoan_;
        _assetsToReturnToPool = assetToReturnToPool_;
    }

    //    function checkExchangeRate(uint256 _apr) internal view {
    //        uint256 exchangeRate = rolloverAccounting.exchangeRateAtDeposit.add(
    //            rolloverAccounting
    //                .exchangeRateAtDeposit
    //                .mul(_apr)
    //                .mul(settings.durationDays)
    //                .div(3600000)
    //        );
    //
    //        //    require(exchangeRate == rolloverAccounting.exchangeRateAtMaturity,
    //        //            "Loan:  Exchange rate is not equal to the exchange rate at maturity");
    //    }

    /**
     * @inheritdoc ILoan
     */

    function fundRollover(
        uint256 assetsFromPool_,
        uint256 assetsFromPriorLoan,
        uint256 totalSupply,
        address priorLoan
    )
        external
        onlyPool
        onlyNotPaused
        onlyLifeCycleState(ILoanLifeCycleState.Requested)
        onlyTransitionState(ILoanTransitionState.ApprovedForDeposits)
        returns (ILoanLifeCycleState)
    {
        _transitionState = ILoanTransitionState.TransitioningFundsIn;

        rolloverAccounting.totalSupply = totalSupply;
        rolloverAccounting.assetsFromPool = assetsFromPool_;
        rolloverAccounting.assetsFromPriorLoan = assetsFromPriorLoan;
        // rolloverAccounting.assetToReturnToPool = assetToReturnToPool_;
        uint256 totalAsset = assetsFromPool_ + assetsFromPriorLoan;
        settings.principal = totalAsset;
        settings.startingPrincipal = totalAsset;
        IVault borrowerVault = IVault(
            IPool(_pool).withdrawController().borrowerVault()
        );
        _state = LoanLib.fundRolloverLoan(
            liquidityAsset,
            borrowerVault,
            assetsFromPool_
        );

        //        if (priorLoan != address(0)) {
        //            ILoan(priorLoan).rolloverAllocation(
        //                assetsFromPriorLoan,
        //                assetToReturnToPool_
        //            );
        //        }

        indicativeInterest = settings
            .principal
            .mul(settings.indicativeApr)
            .mul(settings.durationDays.mul(LoanLib.RAY).div(360))
            .div(LoanLib.RAY)
            .div(10000);

        originationFee = totalAsset
            .mul(settings.originationBps)
            .mul(settings.durationDays.mul(LoanLib.RAY).div(360))
            .div(LoanLib.RAY)
            .div(10000);

        if (priorLoan == address(0)) {
            rolloverAccounting.exchangeRateAtDeposit = 1e18;
        } else {
            rolloverAccounting.exchangeRateAtDeposit = ILoan(priorLoan)
                .exchangeRateAtMaturity();
        }
        rolloverAccounting.exchangeRateAtMaturity = rolloverAccounting
            .exchangeRateAtDeposit
            .add(
                rolloverAccounting
                    .exchangeRateAtDeposit
                    .mul(settings.indicativeApr)
                    .mul(settings.durationDays)
                    .div(3600000)
            );

        //  checkExchangeRate(settings.indicativeApr);
        IPool(_pool).withdrawController().drawDownToBorrowerWallet(
            assetsFromPool_
        );

        _state = ILoanLifeCycleState.Funded;
        return _state;
    }

    function changeIndicativeApr(uint256 _apr) internal {
        require(
            _transitionState == ILoanTransitionState.ApprovedForDeposits ||
                _transitionState == ILoanTransitionState.Created,
            "Loan:  RollOver already started"
        );
        require(_apr > 0, "Loan:  APR cannot be zero");

        settings.indicativeApr = _apr;
    }

    function finalizeApr(uint256 _apr) internal {
        require(_apr > 0, "Loan:  APR cannot be zero");

        settings.finalizedApr = _apr;
        interest = settings
            .principal
            .mul(settings.finalizedApr)
            .mul(settings.durationDays.mul(LoanLib.RAY).div(360))
            .div(LoanLib.RAY)
            .div(10000);

        uint256 totalAsset = rolloverAccounting.assetsFromPool +
            rolloverAccounting.assetsFromPriorLoan;

        originationFee = totalAsset
            .mul(settings.originationBps)
            .mul(settings.durationDays.mul(LoanLib.RAY).div(360))
            .div(LoanLib.RAY)
            .div(10000);

        // if (rolloverAccounting.totalSupply == 0) {
        //     rolloverAccounting.exchangeRateAtMaturity = 1e18;
        // } else {
        rolloverAccounting.exchangeRateAtMaturity =
            rolloverAccounting.exchangeRateAtDeposit +
            rolloverAccounting
                .exchangeRateAtDeposit
                .mul(_apr)
                .mul(settings.durationDays)
                .div(3600000);

        //     rolloverAccounting.exchangeRateAtMaturity = (rolloverAccounting
        //         .assetsFromPool +
        //         interest +
        //         rolloverAccounting.assetsFromPriorLoan).mul(1e18).div(
        //             rolloverAccounting.totalSupply
        //         );
        // }
        //checkExchangeRate(_apr);
    }

    function rolloverMaturedLoan()
        external
        onlyNotPaused
        onlyPool
        onlyTransitionState(ILoanTransitionState.RedemptionsClosed)
    {
        if (
            !(maturingTimestamp < block.timestamp &&
                block.timestamp < maturingTimestamp + (1 days))
        ) {
            emit LoanScheduleViolation(
                _transitionState,
                block.timestamp,
                maturingTimestamp,
                maturingTimestamp + (1 days)
            );
        }
        _transitionState = ILoanTransitionState.TransitioningFundsOut;
        _state = ILoanLifeCycleState.Matured;
    }

    /**
     * @inheritdoc ILoan
     */
    function rolloverAndFinalizeApr(
        uint256 _apr
    )
        external
        onlyNotPaused
        onlyPool
        onlyTransitionState(ILoanTransitionState.TransitioningFundsIn)
    {
        _transitionState = ILoanTransitionState.AccruingInterest;

        finalizeApr(_apr);
        _state = ILoanLifeCycleState.Active;
    }

    function accrualStartDayTimestamp() external view returns (uint256) {
        return settings.accrualStartDayTimestamp;
    }

    function transferInWindowDurationDays() external view returns (uint256) {
        return settings.transferInWindowDurationDays;
    }

    function transferOutWindowDurationDays() external view returns (uint256) {
        return settings.transferOutWindowDurationDays;
    }

    function assetsRolloverToNextLoan() external view returns (uint256) {
        return _assetsRolloverToNextLoan;
    }

    function assetsToReturnToPool() public view returns (uint256) {
        return _assetsToReturnToPool;
    }

    function assetsFromPool() external view returns (uint256) {
        return rolloverAccounting.assetsFromPool;
    }

    function completeRolloverNetPayment()
        external
        override
        onlyNotPaused
        onlyPool
        onlyTransitionState(ILoanTransitionState.TransitioningFundsOut)
        onlyLifeCycleState(ILoanLifeCycleState.Matured)
        returns (
            uint256 feeVaultAmount,
            uint256 assetsReturnedToPool,
            uint256 interestAccrued
        )
    {
        if (
            !(maturingTimestamp < block.timestamp &&
                block.timestamp < redemptionAvailableTimestamp)
        ) {
            emit LoanScheduleViolation(
                _transitionState,
                block.timestamp,
                maturingTimestamp,
                redemptionAvailableTimestamp
            );
        }

        uint256 scalingValue = LoanLib.RAY;

        feeVaultAmount = LoanLib.previewOriginationFee(settings, scalingValue);

        IPool(_pool).withdrawController().payFees(feeVaultAmount);
        assetsReturnedToPool = assetsToReturnToPool();

        if (assetsReturnedToPool > 0) {
            IPool(_pool).withdrawController().repayLoan(assetsReturnedToPool);
        }

        interestAccrued = interest;
        _transitionState = ILoanTransitionState.RedemptionsReleased;
        _state = ILoanLifeCycleState.Settled;
    }

    function exchangeRateAtDeposit() external view returns (uint256) {
        return rolloverAccounting.exchangeRateAtDeposit;
    }

    function exchangeRateAtMaturity() external view returns (uint256) {
        if (
            _transitionState == ILoanTransitionState.Created ||
            _transitionState == ILoanTransitionState.ApprovedForDeposits
        ) {
            return 1e18;
        }

        return rolloverAccounting.exchangeRateAtMaturity;
    }

    /**
     * @inheritdoc ILoan
     */
    function state() external view returns (ILoanLifeCycleState) {
        return _state;
    }

    function transitionState() external view returns (ILoanTransitionState) {
        return _transitionState;
    }

    /**
     * @inheritdoc ILoan
     */
    function borrower() external view returns (address) {
        return _borrower;
    }

    /**
     * @inheritdoc ILoan
     */
    function pool() external view returns (address) {
        return _pool;
    }

    /**
     * @inheritdoc ILoan
     */
    function factory() external view returns (address) {
        return _factory;
    }

    /**
     * @inheritdoc ILoan
     */
    function dropDeadTimestamp() external view returns (uint256) {
        return settings.dropDeadTimestamp;
    }

    /**
     * @inheritdoc ILoan
     */
    function durationDays() external view returns (uint256) {
        return settings.durationDays;
    }

    /**
     * @inheritdoc ILoan
     */
    function finalizedApr() external view returns (uint256) {
        return settings.finalizedApr;
    }

    function indicativeApr() external view returns (uint256) {
        return settings.indicativeApr;
    }

    /**
     * @inheritdoc ILoan
     */
    function principal() external view returns (uint256) {
        return settings.principal;
    }

    function startingPrincipal() external view returns (uint256) {
        return settings.startingPrincipal;
    }

    /**
     * @inheritdoc ILoan
     */
    function serviceConfiguration()
        external
        view
        returns (IServiceConfigurationV3)
    {
        return _serviceConfiguration;
    }

    function repayEarlyWithdraw(
        uint256 principal_,
        uint256 assetReduction
    ) external onlyPool {
        settings.principal -= principal_;
        interest -= assetReduction - principal_;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import "./interfaces/ILoan.sol";
import "./interfaces/IPool.sol";
import "./interfaces/IVault.sol";
import "./interfaces/IServiceConfiguration.sol";

import "./interfaces/IPoolRegistry.sol";
import "./interfaces/IPoolAccessControl.sol";
import "./factories/interfaces/IPoolAccessControlFactory.sol";
import "./controllers/interfaces/IWithdrawController.sol";
import "./controllers/interfaces/IPoolController.sol";
import "./factories/interfaces/IWithdrawControllerFactory.sol";
import "./factories/interfaces/IPoolControllerFactory.sol";
import "./factories/interfaces/IVaultFactory.sol";
import {ERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {EnumerableSet} from "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";
import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
import {SafeMath} from "@openzeppelin/contracts/utils/math/SafeMath.sol";
import {Math} from "@openzeppelin/contracts/utils/math/Math.sol";
import "./libraries/PoolLib.sol";
import "./upgrades/BeaconImplementation.sol";

/**
 * @title Liquidity pool for Perimeter.
 * @dev Used through a beacon proxy.
 */

contract Pool is IPool, ERC20Upgradeable, BeaconImplementation {
    using SafeERC20Upgradeable for IERC20Upgradeable;
    using SafeMath for uint256;
    using EnumerableSet for EnumerableSet.AddressSet;
    /**
     * @dev The reference to the access control contract
     */
    IPoolAccessControl public poolAccessControl;

    event PoolCreated();
    event LoanCreated(address indexed loan);

    event PoolDeposit(
        address indexed lender,
        address indexed loan,
        uint256 assets,
        uint256 shares
    );
    event LoanApproved(address indexed loan);
    event LoanRolloverInitiated(
        address indexed loan,
        address indexed priorLoan,
        uint256 assetsFromPriorToNextLoan,
        uint256 assetsFromPool,
        uint256 assetToAReturnToPool
    );

    event LoanRolloverFinalized(
        address indexed loan,
        address indexed priorLoan
    );

    event LoanMatured(address indexed loan);

    event LoanRepayment(
        address indexed loan,
        uint256 feeAmount,
        uint256 assetsReturnedToPool
    );

    event RedeemRequested(
        address indexed lender,
        address indexed loan,
        uint256 assets,
        uint256 shares
    );
    event RedeemReleased(
        address indexed lender,
        address indexed loan,
        uint256 shares,
        uint256 assets
    );
    event Redeem(
        address indexed lender,
        address indexed loan,
        uint256 shares,
        uint256 assets
    );
    event WithdrawEarlyRequested(
        address indexed lender,
        address indexed loan,
        uint256 shares,
        uint256 principal
    );
    event WithdrawEarlyAccepted(
        address indexed lender,
        address indexed loan,
        uint256 shares,
        uint256 principal
    );
    event WithdrawEarlyRepay(
        address indexed lender,
        address indexed loan,
        uint256 shares,
        uint256 principal,
        uint256 repayment,
        uint256 fees
    );
    event RequestFeePaid(address indexed lender, uint256 feeShares);
    event WithdrawFeeVault(address indexed receiver, uint256 amount);

    /**
     * @dev Reference to the global service configuration.
     */
    IServiceConfigurationV3 private _serviceConfiguration;

    /**
     * @dev Reference to the underlying liquidity asset for the pool.
     */
    IERC20Upgradeable private _liquidityAsset;

    /**
     * @dev Various accounting statistics updated throughout the pool lifetime.
     */
    IPoolAccountings private _accountings;

    /**
     * @dev Reference to the withdraw controller for the pool.
     */
    IWithdrawController public withdrawController;

    /**
     * @dev Reference to the admin's controller for the pool.
     */
    IPoolController public poolController;
    address public createdLoan;
    address public activeLoan;
    address public requestedLoan;
    address public maturedLoan;
    EnumerableSet.AddressSet private _settledLoans;

    uint256 public activatedAt;

    error NotPoolController();
    error NotLender();
    error NotBorrowerManager();
    error PoolNotActive();
    error InvalidAccess();
    error InvalidLoan();
    error PoolInvalidState();
    error PoolPaused();
    error TransferDisabled();
    /**
     * @dev Modifier to ensure only the PoolController calls a method.
     */
    modifier onlyPoolController() {
        if (msg.sender != address(poolController)) revert NotPoolController();
        _;
    }

    /**
     * @dev Modifier that checks that the caller is a pool lender
     */
    modifier onlyLenderWithPPT() {
        if (balanceOf(msg.sender) <= 0) revert NotLender();

        _;
    }

    /**
     * @dev Modifier to check that the pool has ever been activated
     */
    modifier onlyActivatedPool() {
        if (activatedAt == 0) revert PoolNotActive();
        _;
    }

    /**
     * @dev Modifier to check that the protocol is not paused
     */
    modifier onlyNotPaused() {
        if (_serviceConfiguration.paused() == true) revert PoolPaused();
        _;
    }

    /**
     * @dev Modifier that checks that the pool is Initialized or Active
     */
    modifier atState(IPoolLifeCycleState state_) {
        if (poolController.state() != state_) revert PoolInvalidState();
        _;
    }

    function version() public pure returns (uint16) {
        return 256 * 1 + 0;
    }

    function decimals() public pure override returns (uint8) {
        return 6;
    }

    /*//////////////////////////////////////////////////////////////
                       LOAN SET OPERATIONS
//////////////////////////////////////////////////////////////*/

    function rolloverAndFinalizeApr(
        uint256 _apr
    ) external onlyNotPaused onlyBorrowerManger {
        if (activeLoan != address(0)) {
            ILoan(activeLoan).rolloverMaturedLoan();
            emit LoanMatured(msg.sender);
            maturedLoan = activeLoan;
        }

        ILoan(requestedLoan).rolloverAndFinalizeApr(_apr);
        activeLoan = requestedLoan;
        _accountings.totalAvailableAssets += ILoan(activeLoan).interest();
        requestedLoan = address(0);
        emit LoanRolloverFinalized(activeLoan, maturedLoan);
        updatePoolData();
    }

    function settledLoans() external view returns (address[] memory) {
        return _settledLoans.values();
    }

    function loanCreated(address loan) external {
        if (msg.sender != serviceConfiguration().getLoanFactory())
            revert InvalidAccess();

        emit LoanCreated(loan);
        createdLoan = loan;
        updatePoolData();
    }

    function approveLoanForPool(
        address loan
    ) external onlyNotPaused onlyPoolController {
        if (requestedLoan != address(0) || ILoan(loan).pool() != address(this))
            revert InvalidLoan();

        ILoan(loan).approve();
        emit LoanApproved(loan);
        requestedLoan = loan;
        createdLoan = address(0);
        updatePoolData();
    }

    function currentExpectedInterest()
        external
        view
        override
        returns (uint256)
    {
        if (activeLoan != address(0)) {
            return ILoan(activeLoan).interest();
        }
        return 0;
    }

    modifier onlyDepositWindow() {
        if (
            requestedLoan == address(0) ||
            !ILoan(requestedLoan).inDepositWindow()
        ) revert InvalidLoan();

        _;
    }
    modifier onlyPermittedLender() {
        if (!poolAccessControl.isAllowed(msg.sender)) revert NotLender();

        if (IPoolController(poolController).borrowerManager() == msg.sender)
            revert NotLender();

        _;
    }
    modifier onlyBorrowerManger() {
        if (
            IPoolController(poolController).borrowerManager() != msg.sender ||
            !poolAccessControl.isAllowed(msg.sender)
        ) revert NotBorrowerManager();

        _;
    }

    function isPermittedLender(address receiver) public view returns (bool) {
        return poolAccessControl.isAllowed(receiver);
    }

    /**
     * @dev Initializer for Pool

     * @param poolSettings configurable settings for the pool
     * @param tokenName Name used for issued pool tokens
     * @param tokenSymbol Symbol used for issued pool tokens
     */
    function initialize(
        PoolAddressList memory poolAddressList,
        IPoolConfigurableSettings memory poolSettings,
        string memory tokenName,
        string memory tokenSymbol
    ) public initializer {
        __ERC20_init(tokenName, tokenSymbol);
        _serviceConfiguration = IServiceConfigurationV3(
            poolAddressList.serviceConfiguration
        );

        _liquidityAsset = IERC20Upgradeable(poolAddressList.liquidityAsset);

        // Build the withdraw controller
        // Build the admin controller
        poolController = IPoolController(
            IPoolControllerFactory(poolAddressList.poolControllerFactory)
                .createController(
                    address(this),
                    poolAddressList.serviceConfiguration,
                    poolAddressList.poolAdmin,
                    poolAddressList.liquidityAsset,
                    poolSettings
                )
        );
        poolAccessControl = IPoolAccessControl(
            IPoolAccessControlFactory(poolAddressList.poolAccessControlFactory)
                .create(address(this))
        );

        withdrawController = IWithdrawController(
            IWithdrawControllerFactory(
                poolAddressList.withdrawControllerFactory
            ).createController(
                    address(this),
                    address(poolAddressList.vaultFactory),
                    address(poolSettings.borrowerWalletAddress)
                )
        );

        // Allow the contract to move infinite amount of vault liquidity assets
        _liquidityAsset.safeApprove(address(this), type(uint256).max);

        emit PoolCreated();
    }

    /**
     * @inheritdoc IPoolBase
     */
    function serviceConfiguration()
        public
        view
        returns (IServiceConfigurationV3)
    {
        return _serviceConfiguration;
    }

    /**
     * @inheritdoc IPool
     */
    function settings()
        public
        view
        returns (IPoolConfigurableSettings memory poolSettings)
    {
        return poolController.settings();
    }

    /**
     * @inheritdoc IPool
     */
    function state() public view returns (IPoolLifeCycleState) {
        return poolController.state();
    }

    /**
     * @inheritdoc IPoolBase
     */
    function admin() external view override returns (address) {
        return poolController.admin();
    }

    function borrowerManagerAddr() external view override returns (address) {
        return poolController.borrowerManager();
    }

    function borrowerWalletAddr() external view override returns (address) {
        return poolController.borrowerWalletAddress();
    }

    /**
     * @inheritdoc IPool
     */
    function accountings()
        external
        view
        override
        returns (IPoolAccountings memory)
    {
        return _accountings;
    }

    /**
     * @inheritdoc IPool
     */
    function onActivated() external onlyPoolController {
        activatedAt = block.timestamp;
    }

    function liquidityAssetAddr() public view returns (address) {
        return address(_liquidityAsset);
    }

    function asset() public view returns (address) {
        return address(_liquidityAsset);
    }

    function initiateRollover(
        address loan,
        address priorLoan
    ) external onlyNotPaused onlyPoolController {
        if (!(loan == requestedLoan && priorLoan == activeLoan))
            revert InvalidLoan();

        uint256 _outstandingLoanPrincipals;
        uint256 assetsFromPool;
        uint256 assetsFromPriorToNextLoan;
        uint256 totalSupply_;
        uint256 assetToAReturnToPool;
        (
            _outstandingLoanPrincipals,
            assetsFromPool,
            assetsFromPriorToNextLoan,
            totalSupply_,
            assetToAReturnToPool
        ) = PoolLib.calculateRollover(
            priorLoan,
            address(_liquidityAsset),
            address(this),
            _accountings.outstandingLoanPrincipals
        );

        _liquidityAsset.safeApprove(loan, assetsFromPool);

        ILoan(loan).fundRollover(
            assetsFromPool,
            assetsFromPriorToNextLoan,
            totalSupply_,
            priorLoan
        );
        if (priorLoan != address(0)) {
            ILoan(priorLoan).rolloverAllocation(
                assetsFromPriorToNextLoan,
                assetToAReturnToPool
            );
        }

        _accountings.outstandingLoanPrincipals = _outstandingLoanPrincipals;

        emit LoanRolloverInitiated(
            loan,
            priorLoan,
            assetsFromPriorToNextLoan,
            assetsFromPool,
            assetToAReturnToPool
        );
        updatePoolData();
    }

    function completeRolloverNetPayment(
        address settlingLoan
    ) external onlyNotPaused onlyPoolController {
        uint256 feeVaultAmount;
        uint256 assetsReturnedToPool;
        uint256 interestAccrued;
        (feeVaultAmount, assetsReturnedToPool, interestAccrued) = ILoan(
            settlingLoan
        ).completeRolloverNetPayment();

        if (maturedLoan != settlingLoan) revert InvalidLoan();

        maturedLoan = address(0);
        _settledLoans.add(settlingLoan);
        _accountings.outstandingLoanPrincipals += interestAccrued;
        _accountings.outstandingLoanPrincipals -= assetsReturnedToPool;
        emit LoanRepayment(settlingLoan, feeVaultAmount, assetsReturnedToPool);

        address receiver = serviceConfiguration().getPoolAdminWallet();
        uint256 amount = _liquidityAsset.balanceOf(
            withdrawController.feeVault()
        );
        withdrawController.withdrawFeeVault(amount, receiver);
        emit WithdrawFeeVault(receiver, amount);
        updatePoolData();
    }

    function redemptionState()
        public
        view
        returns (IRedemptionState memory _redemptionState)
    {
        return withdrawController.redemptionState();
    }

    function releaseRolloverRedemption(
        address owner
    ) external onlyPoolController {
        uint256 shares;
        uint256 assets;
        (shares, assets) = withdrawController.releaseRolloverRedemption(owner);
        emit RedeemReleased(owner, maturedLoan, shares, assets);
        updatePoolData();
    }

    /**
     * @inheritdoc IPool
     */
    function totalAvailableAssets() public view returns (uint256 assets) {
        return _accountings.totalAvailableAssets;
    }

    /**
     * @inheritdoc IPool
     */
    function totalAvailableSupply()
        public
        view
        override
        returns (uint256 shares)
    {
        shares = PoolLib.calculateTotalAvailableShares(
            address(this),
            withdrawController.totalRedeemableShares()
        );
    }

    /**
     * @inheritdoc IPoolBase
     */
    function liquidityPoolAssets() public view returns (uint256 assets) {
        uint256 interest = 0;
        if (activeLoan != address(0)) {
            interest = ILoan(activeLoan).interest();
        }

        return
            PoolLib.calculateTotalAssets(
                address(_liquidityAsset),
                address(this),
                0,
                interest
            );

        //        return
        //            _accountings.totalAvailableAssets -
        //            withdrawController.totalWithdrawableAssets();
    }

    function reschedule(
        address loan,
        uint256 accrualStartDayTimestamp,
        uint256 transferInWindowDurationDays,
        uint256 transferOutWindowDurationDays,
        uint256 durationDays
    ) external override onlyPoolController onlyNotPaused {
        if (!(activeLoan == loan || requestedLoan == loan))
            revert InvalidLoan();

        ILoan(loan).reschedule(
            accrualStartDayTimestamp,
            transferInWindowDurationDays,
            transferOutWindowDurationDays,
            durationDays
        );
        updatePoolData();
    }

    /**
     * @inheritdoc IRequestWithdrawable
     */
    function previewRedeemRequest(
        uint256 shares
    ) external view returns (uint256 assets) {
        assets = convertToAssets(shares);
    }

    /**
     * @inheritdoc IRequestWithdrawable
     */
    function previewWithdrawRequest(
        uint256 assets
    ) external view returns (uint256 shares) {
        shares = convertToShares(assets);
    }

    /**
     * @inheritdoc IRequestWithdrawable
     */
    function requestRedeem(
        uint256 shares
    )
        external
        onlyNotPaused
        onlyActivatedPool
        onlyPermittedLender
        onlyLenderWithPPT
        returns (uint256 assets)
    {
        assets = convertToAssets(shares);

        withdrawController.performRequest(msg.sender, shares, assets);

        emit RedeemRequested(msg.sender, activeLoan, assets, shares);
        updatePoolData();
    }

    /**
     * @inheritdoc IRequestWithdrawable
     */
    function maxRedeemRequest(
        address owner
    ) public view returns (uint256 maxShares) {
        maxShares = withdrawController.maxRedeemRequest(owner);
    }

    /**
     * @inheritdoc IRequestWithdrawable
     */
    function maxWithdrawRequest(
        address owner
    ) public view returns (uint256 maxAssets) {
        maxAssets = convertToAssets(maxRedeemRequest(owner));
    }

    /*//////////////////////////////////////////////////////////////
                        ERC-4626 Methods
    //////////////////////////////////////////////////////////////*/

    function totalAssets() public view returns (uint256) {
        uint256 interest = 0;
        if (activeLoan != address(0)) {
            interest = ILoan(activeLoan).interest();
        }

        return
            PoolLib.calculateTotalAssets(
                address(_liquidityAsset),
                address(this),
                _accountings.outstandingLoanPrincipals,
                interest
            );
    }

    function convertToShares(
        uint256 assets
    ) public view override returns (uint256 shares) {
        if (activeLoan == address(0)) {
            shares = assets;
        } else {
            shares = assets.mul(1e18).div(exchangeRateAtMaturity());
        }
    }

    function exchangeRateAtDeposit()
        public
        view
        override
        returns (uint256 _exchangeRateAtDeposit)
    {
        if (activeLoan != address(0)) {
            ILoan loan = ILoan(activeLoan);
            _exchangeRateAtDeposit = loan.exchangeRateAtDeposit();
        } else {
            _exchangeRateAtDeposit = 1e18;
        }
    }

    function exchangeRateAtMaturity()
        public
        view
        override
        returns (uint256 _exchangeRateAtMaturity)
    {
        if (activeLoan != address(0)) {
            ILoan loan = ILoan(activeLoan);
            _exchangeRateAtMaturity = loan.exchangeRateAtMaturity();
        } else {
            _exchangeRateAtMaturity = 1e18;
        }
    }

    function convertToAssets(
        uint256 shares
    ) public view override returns (uint256 assets) {
        if (activeLoan == address(0)) {
            assets = shares;
        } else {
            assets = exchangeRateAtMaturity().mul(shares).div(1e18);
        }
    }

    function closeOfBusinessTime() external view returns (uint256) {
        return poolController.closeOfBusinessTime();
    }

    function maxDeposit(address owner) public view override returns (uint256) {
        if (
            _serviceConfiguration.paused() == true ||
            !isPermittedLender(owner) ||
            poolController.state() != IPoolLifeCycleState.Active
        ) {
            return 0;
        }
        return
            PoolLib.calculateMaxDeposit(
                poolController.state(),
                settings().maxCapacity,
                totalAvailableAssets()
            );
    }

    function deposit(
        uint256 assets,
        address lender
    )
        public
        virtual
        override
        onlyNotPaused
        atState(IPoolLifeCycleState.Active)
        onlyPermittedLender
        onlyDepositWindow
        returns (uint256 shares)
    {
        if (
            poolController.state() == IPoolLifeCycleState.DisruptionOrDefault ||
            msg.sender != lender
        ) revert PoolInvalidState();

        shares = PoolLib.executeDeposit(
            liquidityAssetAddr(),
            address(this),
            lender,
            assets,
            convertToShares(assets),
            maxDeposit(lender),
            _mint,
            _accountings
        );

        emit PoolDeposit(lender, requestedLoan, assets, shares);
        updatePoolData();
    }

    function maxWithdraw(
        address owner
    ) public view override returns (uint256 assets) {
        if (
            _serviceConfiguration.paused() == true || !isPermittedLender(owner)
        ) {
            return 0;
        }
        assets = withdrawController.maxWithdraw(owner);
    }

    function withdraw(
        uint256 assets,
        address receiver,
        address owner
    )
        public
        virtual
        onlyNotPaused
        onlyPermittedLender
        returns (uint256 shares)
    {
        if (receiver != owner || receiver != msg.sender) revert InvalidAccess();

        // Update the withdraw state
        shares = withdrawController.withdraw(owner, assets);

        // transfer assets, and burn the shares
        _performWithdrawTransfer(owner, shares, assets);
        updatePoolData();
    }

    function withdrawFeeVault(
        uint256 amount,
        address receiver
    ) external onlyNotPaused onlyPoolController {
        withdrawController.withdrawFeeVault(amount, receiver);
        emit WithdrawFeeVault(receiver, amount);
        updatePoolData();
    }

    function maxRedeem(
        address owner
    ) public view override returns (uint256 maxShares) {
        if (
            _serviceConfiguration.paused() == true || !isPermittedLender(owner)
        ) {
            return 0;
        }
        maxShares = withdrawController.maxRedeem(owner);
    }

    function redeem(
        uint256 shares,
        address receiver,
        address owner
    )
        public
        virtual
        onlyNotPaused
        onlyPermittedLender
        returns (uint256 assets)
    {
        if (receiver != owner || receiver != msg.sender) revert InvalidAccess();

        // Update the withdraw state
        assets = withdrawController.redeem(owner, shares);

        // transfer assets, and burn the shares

        _performWithdrawTransfer(owner, shares, assets);

        emit Redeem(owner, maturedLoan, shares, assets);
        updatePoolData();
    }

    /**
     * @dev Redeem a number of shares for a given number of assets. This method
     * will transfer `assets` from the vault to the `receiver`, and burn `shares`
     * from `owner`.
     */
    function _performWithdrawTransfer(
        address owner,
        uint256 shares,
        uint256 assets
    ) internal {
        // Transfer assets
        _liquidityAsset.safeTransferFrom(address(this), owner, assets);

        // Burn the shares
        _burn(owner, shares);
        _accountings.totalAvailableAssets -= assets;

        // Updating accountings
        _accountings.totalAssetsWithdrawn += assets;

        emit Withdraw(owner, owner, owner, assets, shares);
    }

    /*//////////////////////////////////////////////////////////////
                            ERC-20 Overrides
    //////////////////////////////////////////////////////////////*/

    /**
     * @dev Disables Perimeter Pool Token transfers.
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, amount);

        if (to != address(0) && from != address(0)) {
            if (
                !poolAccessControl.isAllowed(from) ||
                !poolAccessControl.isAllowed(to)
            ) {
                revert TransferDisabled();
            }
            if (maxRedeemRequest(from) < amount) {
                revert TransferDisabled();
            }
        }
    }

    /*//////////////////////////////////////////////////////////////
                           Early Withdraws
    //////////////////////////////////////////////////////////////*/

    function requestEarlyRedeem(
        uint256 shares
    )
        external
        onlyNotPaused
        onlyActivatedPool
        onlyPermittedLender
        onlyLenderWithPPT
    {
        uint256 principal = withdrawController.requestEarlyRedeem(
            msg.sender,
            shares
        );

        emit WithdrawEarlyRequested(msg.sender, activeLoan, shares, principal);
        updatePoolData();
    }

    function acceptEarlyRedeemRequest(
        address investorAddr
    )
        external
        override
        onlyNotPaused
        onlyBorrowerManger
        returns (uint256 principal)
    {
        uint256 shares;
        (shares, principal) = withdrawController.acceptEarlyRedeemRequest(
            investorAddr
        );

        emit WithdrawEarlyAccepted(investorAddr, activeLoan, shares, principal);
        updatePoolData();
    }

    function repayEarlyWithdraw(
        address investorAddr,
        uint256 amount
    )
        external
        override
        onlyNotPaused
        onlyBorrowerManger
        returns (
            uint256 principal,
            uint256 repayment,
            uint256 redeemedShares,
            uint256 fees
        )
    {
        uint256 assetReduction;
        (
            principal,
            repayment,
            redeemedShares,
            fees,
            assetReduction
        ) = withdrawController.repayEarlyWithdraw(investorAddr, amount);

        _burn(investorAddr, redeemedShares);

        _liquidityAsset.safeTransferFrom(
            address(this),
            investorAddr,
            repayment
        );

        ILoan(activeLoan).repayEarlyWithdraw(principal, assetReduction);

        _accountings.outstandingLoanPrincipals -= principal;
        _accountings.totalAvailableAssets -= assetReduction;

        // Updating accountings
        _accountings.totalAssetsWithdrawn += repayment;

        emit WithdrawEarlyRepay(
            investorAddr,
            activeLoan,
            redeemedShares,
            principal,
            repayment,
            fees
        );
        address receiver = serviceConfiguration().getPoolAdminWallet();

        withdrawController.withdrawFeeVault(fees, receiver);
        emit WithdrawFeeVault(receiver, fees);
        updatePoolData();
    }

    /*** 
    *
    V3
    
     */

    function poolType() external pure returns (IPoolType) {
        return IPoolType.TermPool;
    }

    function updatePoolData() internal {
        address poolRegistryAddr = _serviceConfiguration.getPoolRegistry();
        IPoolRegistry(poolRegistryAddr).updatePoolData(address(this));
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";

/**
 * @title BeaconImplementation base contract
 * @dev Base contract that overrides the constructor to disable initialization.
 */
abstract contract BeaconImplementation is Initializable {
    /// @custom:oz-upgrades-unsafe-allow constructor
    constructor() {
        _disableInitializers();
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

import "../interfaces/IServiceConfigurationV3.sol";
import "./interfaces/IBeacon.sol";

/**
 * @title Factory for emitting beacon proxies.
 * @dev Base contract for emitting new Beacon proxy contracts. Allows setting new
 * implementations by the global deployer.
 */
abstract contract BeaconProxyFactory is IBeacon {
    /**
     * @dev Address of the protocol service configuration
     */
    IServiceConfigurationV3 internal _serviceConfiguration;

    /**
     * @dev Modifier that requires that the sender is registered as a protocol deployer.
     */
    modifier onlyDeployer() {
        require(
            _serviceConfiguration.isDeployer(msg.sender),
            "Upgrade: unauthorized"
        );
        _;
    }

    /**
     * @inheritdoc IBeacon
     */
    address public implementation;

    /**
     * @inheritdoc IBeacon
     */
    function setImplementation(
        address newImplementation
    ) external onlyDeployer {
        implementation = newImplementation;
        emit ImplementationSet(newImplementation);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

/**
 * @title Interface for Beacon contracts.
 * @dev Holds a reference to the implementation, and allows setting new ones.
 */
interface IBeacon {
    /**
     * @dev Emitted when a new implementation is set.
     */
    event ImplementationSet(address indexed implementation);

    /**
     * @dev Returns an address used by BeaconProxy contracts for delegated calls.
     */
    function implementation() external view returns (address);

    /**
     * @dev Updates the implementation.
     */
    function setImplementation(address implementation) external;
}

{
  "optimizer": {
    "enabled": true,
    "runs": 10
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"serviceConfiguration","type":"address"},{"internalType":"address","name":"withdrawControllerFactory","type":"address"},{"internalType":"address","name":"poolControllerFactory","type":"address"},{"internalType":"address","name":"vaultFactory","type":"address"},{"internalType":"address","name":"poolAccessControlFactory","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"implementation","type":"address"}],"name":"ImplementationSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"addr","type":"address"}],"name":"PoolCreated","type":"event"},{"inputs":[{"internalType":"address","name":"liquidityAsset","type":"address"},{"components":[{"internalType":"uint256","name":"maxCapacity","type":"uint256"},{"internalType":"uint256","name":"endDate","type":"uint256"},{"internalType":"address","name":"borrowerManager","type":"address"},{"internalType":"address","name":"borrowerWalletAddress","type":"address"},{"internalType":"uint256","name":"closeOfBusinessTime","type":"uint256"},{"internalType":"uint256","name":"earlyWithdrawFeeBps","type":"uint256"}],"internalType":"struct IPoolConfigurableSettings","name":"settings","type":"tuple"},{"internalType":"string","name":"tokenName","type":"string"},{"internalType":"string","name":"tokenSymbol","type":"string"}],"name":"createPool","outputs":[{"internalType":"address","name":"poolAddress","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getPoolAccessControlFactory","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getPoolControllerFactory","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getVaultFactory","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getWithdrawControllerFactory","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"implementation","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newImplementation","type":"address"}],"name":"setImplementation","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"pure","type":"function"}]

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000000000000000000000000ec4f65e0a0268ff38ecec711ad5159b96dabab980000000000000000000000000eba83c7b2122e347eeafdc37edf9ed856f0ac4600000000000000000000000066be61e109ecff0e829313b605904cddeb88fff80000000000000000000000005dd6710fed29132325d3fe1aa138046dab641abc000000000000000000000000c641de59d9a55b6657e4bca9bb62822c8bb09ed3

-----Decoded View---------------
Arg [0] : serviceConfiguration (address): 0xec4F65e0A0268ff38ECEc711AD5159b96dAbaB98
Arg [1] : withdrawControllerFactory (address): 0x0eBa83c7b2122e347eEAfDc37Edf9Ed856F0AC46
Arg [2] : poolControllerFactory (address): 0x66be61E109ecff0E829313B605904CDDEb88ffF8
Arg [3] : vaultFactory (address): 0x5dD6710feD29132325d3Fe1aA138046DAB641AbC
Arg [4] : poolAccessControlFactory (address): 0xC641DE59d9A55B6657e4BCa9bB62822c8BB09ED3

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 000000000000000000000000ec4f65e0a0268ff38ecec711ad5159b96dabab98
Arg [1] : 0000000000000000000000000eba83c7b2122e347eeafdc37edf9ed856f0ac46
Arg [2] : 00000000000000000000000066be61e109ecff0e829313b605904cddeb88fff8
Arg [3] : 0000000000000000000000005dd6710fed29132325d3fe1aa138046dab641abc
Arg [4] : 000000000000000000000000c641de59d9a55b6657e4bca9bb62822c8bb09ed3