// File: contracts/OpenSkyOToken.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.10;

import '@openzeppelin/contracts/token/ERC20/ERC20.sol';
import '@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol';
import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
import '@openzeppelin/contracts/token/ERC721/utils/ERC721Holder.sol';
import '@openzeppelin/contracts/token/ERC20/extensions/draft-ERC20Permit.sol';
import '@openzeppelin/contracts/utils/Context.sol';

import './libraries/math/WadRayMath.sol';

import './interfaces/IOpenSkySettings.sol';
import './interfaces/IOpenSkyOToken.sol';
import './interfaces/IOpenSkyPool.sol';
import './interfaces/IOpenSkyIncentivesController.sol';
import './interfaces/IOpenSkyMoneyMarket.sol';

contract OpenSkyOToken is Context, ERC20Permit, ERC20Burnable, ERC721Holder, IOpenSkyOToken {
    using WadRayMath for uint256;
    using SafeERC20 for IERC20;

    IOpenSkySettings public immutable SETTINGS;

    address internal immutable _pool;
    uint256 internal immutable _reserveId;
    address internal immutable _underlyingAsset;

    uint8 private _decimals;

    modifier onlyPool() {
        require(_msgSender() == address(_pool), Errors.ACL_ONLY_POOL_CAN_CALL);
        _;
    }

    constructor(
        address pool,
        uint256 reserveId,
        string memory name,
        string memory symbol,
        uint8 decimals,
        address underlyingAsset,
        address settings
    ) ERC20(name, symbol) ERC20Permit(symbol) {
        _decimals = decimals;
        _pool = pool;
        _reserveId = reserveId;
        _underlyingAsset = underlyingAsset;
        SETTINGS = IOpenSkySettings(settings);
    }

    // The decimals of the token. Override ERC20
    function decimals() public view virtual override returns (uint8) {
        return _decimals;
    }

    function _treasury() internal view returns (address) {
        return SETTINGS.daoVaultAddress();
    }

    function mint(
        address account,
        uint256 amount,
        uint256 index
    ) external virtual override onlyPool {
        uint256 amountScaled = amount.rayDiv(index);
        require(amountScaled != 0, Errors.AMOUNT_SCALED_IS_ZERO);

        _mint(account, amountScaled);
        emit Mint(account, amount, index);
    }

    function _mint(address account, uint256 amount) internal virtual override {
        uint256 previousBalance = super.balanceOf(account);
        uint256 previousTotalSupply = super.totalSupply();

        super._mint(account, amount);

        address incentiveControllerAddress = SETTINGS.incentiveControllerAddress();
        if (incentiveControllerAddress != address(0)) {
            IOpenSkyIncentivesController(incentiveControllerAddress).handleAction(
                account,
                previousBalance,
                previousTotalSupply
            );
        }
    }

    function burn(
        address account,
        uint256 amount,
        uint256 index
    ) external virtual override onlyPool {
        uint256 amountScaled = amount.rayDiv(index);
        require(amountScaled != 0, Errors.AMOUNT_SCALED_IS_ZERO);

        _burn(account, amountScaled);
        emit Burn(account, amount, index);
    }

    function _burn(address account, uint256 amount) internal virtual override {
        uint256 previousBalance = super.balanceOf(account);
        uint256 previousTotalSupply = super.totalSupply();

        super._burn(account, amount);

        address incentiveControllerAddress = SETTINGS.incentiveControllerAddress();
        if (incentiveControllerAddress != address(0)) {
            IOpenSkyIncentivesController(incentiveControllerAddress).handleAction(
                account,
                previousBalance,
                previousTotalSupply
            );
        }
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal override {
        uint256 index = IOpenSkyPool(_pool).getReserveNormalizedIncome(_reserveId);

        uint256 amountScaled = amount.rayDiv(index);
        require(amountScaled != 0, Errors.AMOUNT_SCALED_IS_ZERO);
        require(amountScaled <= type(uint128).max, Errors.AMOUNT_TRANSFER_OVERFLOW);

        uint256 previousSenderBalance = super.balanceOf(sender);
        uint256 previousRecipientBalance = super.balanceOf(recipient);

        super._transfer(sender, recipient, amountScaled);

        address incentiveControllerAddress = SETTINGS.incentiveControllerAddress();
        if (incentiveControllerAddress != address(0)) {
            uint256 currentTotalSupply = super.totalSupply();
            IOpenSkyIncentivesController(incentiveControllerAddress).handleAction(
                sender,
                previousSenderBalance,
                currentTotalSupply
            );
            if (sender != recipient) {
                IOpenSkyIncentivesController(incentiveControllerAddress).handleAction(
                    recipient,
                    previousRecipientBalance,
                    currentTotalSupply
                );
            }
        }
    }

    function mintToTreasury(uint256 amount, uint256 index) external override onlyPool {
        if (amount == 0) {
            return;
        }
        _mint(_treasury(), amount.rayDiv(index));
        emit MintToTreasury(_treasury(), amount, index);
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual override(ERC20) {
        super._beforeTokenTransfer(from, to, amount);
    }

    event Received(address, uint256);

    receive() external payable {
        emit Received(msg.sender, msg.value);
    }

    // called only by pool
    function deposit(uint256 amount) external override onlyPool {
        DataTypes.ReserveData memory reserve = IOpenSkyPool(_pool).getReserveData(_reserveId);

        if (reserve.isMoneyMarketOn) {
            (bool success, ) = address(reserve.moneyMarketAddress).delegatecall(
                abi.encodeWithSignature('depositCall(address,uint256)', _underlyingAsset, amount)
            );
            require(success, Errors.MONEY_MARKET_DELEGATE_CALL_ERROR);
        }
        emit Deposit(amount);
    }

    function withdraw(uint256 amount, address to) external override onlyPool {
        DataTypes.ReserveData memory reserve = IOpenSkyPool(_pool).getReserveData(_reserveId);

        if (reserve.isMoneyMarketOn) {
            (bool success, ) = address(reserve.moneyMarketAddress).delegatecall(
                abi.encodeWithSignature('withdrawCall(address,uint256,address)', _underlyingAsset, amount, to)
            );
            require(success, Errors.MONEY_MARKET_DELEGATE_CALL_ERROR);
        } else {
            IERC20(_underlyingAsset).safeTransfer(to, amount);
        }
        emit Withdraw(amount);
    }

    function balanceOf(address account) public view override(ERC20, IERC20) returns (uint256) {
        uint256 index = IOpenSkyPool(_pool).getReserveNormalizedIncome(_reserveId);
        return super.balanceOf(account).rayMul(index);
    }

    function scaledBalanceOf(address account) external view override returns (uint256) {
        return super.balanceOf(account);
    }

    function principleBalanceOf(address account) external view override returns (uint256) {
        uint256 currentBalanceScaled = super.balanceOf(account);
        uint256 lastSupplyIndex = IOpenSkyPool(_pool).getReserveData(_reserveId).lastSupplyIndex;
        return currentBalanceScaled.rayMul(lastSupplyIndex);
    }

    function totalSupply() public view override(ERC20, IERC20) returns (uint256) {
        uint256 currentSupplyScaled = super.totalSupply();

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

        return currentSupplyScaled.rayMul(IOpenSkyPool(_pool).getReserveNormalizedIncome(_reserveId));
    }

    function scaledTotalSupply() external view virtual override returns (uint256) {
        return super.totalSupply();
    }

    function principleTotalSupply() external view virtual override returns (uint256) {
        uint256 currentSupplyScaled = super.totalSupply();
        uint256 lastSupplyIndex = IOpenSkyPool(_pool).getReserveData(_reserveId).lastSupplyIndex;
        return currentSupplyScaled.rayMul(lastSupplyIndex);
    }

    /**
     * @dev Returns the scaled balance of the user and the scaled total supply.
     * @param user The address of the user
     * @return The scaled balance of the user
     * @return The scaled balance and the scaled total supply
     **/
    function getScaledUserBalanceAndSupply(address user) external view override returns (uint256, uint256) {
        return (super.balanceOf(user), super.totalSupply());
    }

    function claimERC20Rewards(address token) external override onlyPool {
        DataTypes.ReserveData memory reserve = IOpenSkyPool(_pool).getReserveData(_reserveId);
        require(
            token != IOpenSkyMoneyMarket(reserve.moneyMarketAddress).getMoneyMarketToken(_underlyingAsset) &&
                token != _underlyingAsset,
            Errors.RESERVE_TOKEN_CAN_NOT_BE_CLAIMED
        );
        IERC20(token).safeTransfer(_treasury(), IERC20(token).balanceOf(address(this)));
    }
}

// File: @openzeppelin/contracts/token/ERC20/ERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

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

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

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

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

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

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

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

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

        return true;
    }

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

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

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

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

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

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

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

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

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

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

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

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

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

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

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

// File: @openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../ERC20.sol";
import "../../../utils/Context.sol";

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        uint256 currentAllowance = allowance(account, _msgSender());
        require(currentAllowance >= amount, "ERC20: burn amount exceeds allowance");
        unchecked {
            _approve(account, _msgSender(), currentAllowance - amount);
        }
        _burn(account, amount);
    }
}

// File: @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

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

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

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

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

// File: @openzeppelin/contracts/token/ERC721/utils/ERC721Holder.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721Receiver.sol";

/**
 * @dev Implementation of the {IERC721Receiver} interface.
 *
 * Accepts all token transfers.
 * Make sure the contract is able to use its token with {IERC721-safeTransferFrom}, {IERC721-approve} or {IERC721-setApprovalForAll}.
 */
contract ERC721Holder is IERC721Receiver {
    /**
     * @dev See {IERC721Receiver-onERC721Received}.
     *
     * Always returns `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address,
        address,
        uint256,
        bytes memory
    ) public virtual override returns (bytes4) {
        return this.onERC721Received.selector;
    }
}

// File: @openzeppelin/contracts/token/ERC20/extensions/draft-ERC20Permit.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./draft-IERC20Permit.sol";
import "../ERC20.sol";
import "../../../utils/cryptography/draft-EIP712.sol";
import "../../../utils/cryptography/ECDSA.sol";
import "../../../utils/Counters.sol";

/**
 * @dev Implementation 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.
 *
 * _Available since v3.4._
 */
abstract contract ERC20Permit is ERC20, IERC20Permit, EIP712 {
    using Counters for Counters.Counter;

    mapping(address => Counters.Counter) private _nonces;

    // solhint-disable-next-line var-name-mixedcase
    bytes32 private immutable _PERMIT_TYPEHASH =
        keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");

    /**
     * @dev Initializes the {EIP712} domain separator using the `name` parameter, and setting `version` to `"1"`.
     *
     * It's a good idea to use the same `name` that is defined as the ERC20 token name.
     */
    constructor(string memory name) EIP712(name, "1") {}

    /**
     * @dev See {IERC20Permit-permit}.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual override {
        require(block.timestamp <= deadline, "ERC20Permit: expired deadline");

        bytes32 structHash = keccak256(abi.encode(_PERMIT_TYPEHASH, owner, spender, value, _useNonce(owner), deadline));

        bytes32 hash = _hashTypedDataV4(structHash);

        address signer = ECDSA.recover(hash, v, r, s);
        require(signer == owner, "ERC20Permit: invalid signature");

        _approve(owner, spender, value);
    }

    /**
     * @dev See {IERC20Permit-nonces}.
     */
    function nonces(address owner) public view virtual override returns (uint256) {
        return _nonces[owner].current();
    }

    /**
     * @dev See {IERC20Permit-DOMAIN_SEPARATOR}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view override returns (bytes32) {
        return _domainSeparatorV4();
    }

    /**
     * @dev "Consume a nonce": return the current value and increment.
     *
     * _Available since v4.1._
     */
    function _useNonce(address owner) internal virtual returns (uint256 current) {
        Counters.Counter storage nonce = _nonces[owner];
        current = nonce.current();
        nonce.increment();
    }
}

// File: @openzeppelin/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT

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;
    }
}

// File: contracts/libraries/math/WadRayMath.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

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

/**
 * @title WadRayMath library
 * @author Aave
 * @dev Provides mul and div function for wads (decimal numbers with 18 digits precision) and rays (decimals with 27 digits)
 **/

library WadRayMath {
    uint256 internal constant WAD = 1e18;
    uint256 internal constant halfWAD = WAD / 2;

    uint256 internal constant RAY = 1e27;
    uint256 internal constant halfRAY = RAY / 2;

    uint256 internal constant WAD_RAY_RATIO = 1e9;

    /**
     * @return One ray, 1e27
     **/
    function ray() internal pure returns (uint256) {
        return RAY;
    }

    /**
     * @return One wad, 1e18
     **/

    function wad() internal pure returns (uint256) {
        return WAD;
    }

    /**
     * @return Half ray, 1e27/2
     **/
    function halfRay() internal pure returns (uint256) {
        return halfRAY;
    }

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

    /**
     * @dev Multiplies two wad, rounding half up to the nearest wad
     * @param a Wad
     * @param b Wad
     * @return The result of a*b, in wad
     **/
    function wadMul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0 || b == 0) {
            return 0;
        }

        require(a <= (type(uint256).max - halfWAD) / b, Errors.MATH_MULTIPLICATION_OVERFLOW);

        return (a * b + halfWAD) / WAD;
    }

    /**
     * @dev Divides two wad, rounding half up to the nearest wad
     * @param a Wad
     * @param b Wad
     * @return The result of a/b, in wad
     **/
    function wadDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, Errors.MATH_DIVISION_BY_ZERO);
        uint256 halfB = b / 2;

        require(a <= (type(uint256).max - halfB) / WAD, Errors.MATH_MULTIPLICATION_OVERFLOW);

        return (a * WAD + halfB) / b;
    }

    /**
     * @dev Multiplies two ray, rounding half up to the nearest ray
     * @param a Ray
     * @param b Ray
     * @return The result of a*b, in ray
     **/
    function rayMul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0 || b == 0) {
            return 0;
        }

        require(a <= (type(uint256).max - halfRAY) / b, Errors.MATH_MULTIPLICATION_OVERFLOW);

        return (a * b + halfRAY) / RAY;
    }

    /**
     * @dev Multiplies two ray, truncating the mantissa
     * @param a Ray
     * @param b Ray
     * @return The result of a*b, in ray
     **/
    function rayMulTruncate(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0 || b == 0) {
            return 0;
        }
        return (a * b) / RAY;
    }

    /**
     * @dev Divides two ray, rounding half up to the nearest ray
     * @param a Ray
     * @param b Ray
     * @return The result of a/b, in ray
     **/
    function rayDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, Errors.MATH_DIVISION_BY_ZERO);
        uint256 halfB = b / 2;

        require(a <= (type(uint256).max - halfB) / RAY, Errors.MATH_MULTIPLICATION_OVERFLOW);

        return (a * RAY + halfB) / b;
    }

    /**
     * @dev Divides two ray, truncating the mantissa
     * @param a Ray
     * @param b Ray
     * @return The result of a/b, in ray
     **/
    function rayDivTruncate(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, Errors.MATH_DIVISION_BY_ZERO);
        return (a * RAY) / b;
    }

    /**
     * @dev Casts ray down to wad
     * @param a Ray
     * @return a casted to wad, rounded half up to the nearest wad
     **/
    function rayToWad(uint256 a) internal pure returns (uint256) {
        uint256 halfRatio = WAD_RAY_RATIO / 2;
        uint256 result = halfRatio + a;
        require(result >= halfRatio, Errors.MATH_ADDITION_OVERFLOW);

        return result / WAD_RAY_RATIO;
    }

    /**
     * @dev Converts wad up to ray
     * @param a Wad
     * @return a converted in ray
     **/
    function wadToRay(uint256 a) internal pure returns (uint256) {
        uint256 result = a * WAD_RAY_RATIO;
        require(result / WAD_RAY_RATIO == a, Errors.MATH_MULTIPLICATION_OVERFLOW);
        return result;
    }
}

// File: contracts/interfaces/IOpenSkySettings.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;
import '../libraries/types/DataTypes.sol';

interface IOpenSkySettings {
    event InitPoolAddress(address operator, address address_);
    event InitLoanAddress(address operator, address address_);
    event InitVaultFactoryAddress(address operator, address address_);
    event InitIncentiveControllerAddress(address operator, address address_);
    event InitWETHGatewayAddress(address operator, address address_);
    event InitPunkGatewayAddress(address operator, address address_);
    event InitDaoVaultAddress(address operator, address address_);

    event AddToWhitelist(address operator, uint256 reserveId, address nft);
    event RemoveFromWhitelist(address operator, uint256 reserveId, address nft);
    event SetReserveFactor(address operator, uint256 factor);
    event SetPrepaymentFeeFactor(address operator, uint256 factor);
    event SetOverdueLoanFeeFactor(address operator, uint256 factor);
    event SetMoneyMarketAddress(address operator, address address_);
    event SetTreasuryAddress(address operator, address address_);
    event SetACLManagerAddress(address operator, address address_);
    event SetLoanDescriptorAddress(address operator, address address_);
    event SetNftPriceOracleAddress(address operator, address address_);
    event SetInterestRateStrategyAddress(address operator, address address_);
    event AddLiquidator(address operator, address address_);
    event RemoveLiquidator(address operator, address address_);

    function poolAddress() external view returns (address);

    function loanAddress() external view returns (address);

    function vaultFactoryAddress() external view returns (address);

    function incentiveControllerAddress() external view returns (address);

    function wethGatewayAddress() external view returns (address);

    function punkGatewayAddress() external view returns (address);

    function inWhitelist(uint256 reserveId, address nft) external view returns (bool);

    function getWhitelistDetail(uint256 reserveId, address nft) external view returns (DataTypes.WhitelistInfo memory);

    function reserveFactor() external view returns (uint256); // treasury ratio

    function MAX_RESERVE_FACTOR() external view returns (uint256);

    function prepaymentFeeFactor() external view returns (uint256);

    function overdueLoanFeeFactor() external view returns (uint256);

    function moneyMarketAddress() external view returns (address);

    function treasuryAddress() external view returns (address);

    function daoVaultAddress() external view returns (address);

    function ACLManagerAddress() external view returns (address);

    function loanDescriptorAddress() external view returns (address);

    function nftPriceOracleAddress() external view returns (address);

    function interestRateStrategyAddress() external view returns (address);
    
    function isLiquidator(address liquidator) external view returns (bool);
}

// File: contracts/interfaces/IOpenSkyOToken.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

interface IOpenSkyOToken is IERC20 {
    event Mint(address indexed account, uint256 amount, uint256 index);
    event Burn(address indexed account, uint256 amount, uint256 index);
    event MintToTreasury(address treasury, uint256 amount, uint256 index);
    event Deposit(uint256 amount);
    event Withdraw(uint256 amount);

    function mint(
        address account,
        uint256 amount,
        uint256 index
    ) external;

    function burn(
        address account,
        uint256 amount,
        uint256 index
    ) external;

    function mintToTreasury(uint256 amount, uint256 index) external;

    function deposit(uint256 amount) external;

    function withdraw(uint256 amount, address to) external;

    function scaledBalanceOf(address account) external view returns (uint256);

    function principleBalanceOf(address account) external view returns (uint256);

    function scaledTotalSupply() external view returns (uint256);

    function principleTotalSupply() external view returns (uint256);

    function getScaledUserBalanceAndSupply(address user) external view returns (uint256, uint256);

    function claimERC20Rewards(address token) external;
}

// File: contracts/interfaces/IOpenSkyPool.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

import '../libraries/types/DataTypes.sol';

/**
 * @title IOpenSkyPool
 * @author OpenSky Labs
 * @notice Defines the basic interface for an OpenSky Pool.
 **/

interface IOpenSkyPool {
    /*
     * @dev Emitted on create()
     * @param reserveId The ID of the reserve
     * @param underlyingAsset The address of the underlying asset
     * @param oTokenAddress The address of the oToken
     * @param name The name to use for oToken
     * @param symbol The symbol to use for oToken
     * @param decimals The decimals of the oToken
     */
    event Create(
        uint256 indexed reserveId,
        address indexed underlyingAsset,
        address indexed oTokenAddress,
        string name,
        string symbol,
        uint8 decimals
    );

    /*
     * @dev Emitted on setTreasuryFactor()
     * @param reserveId The ID of the reserve
     * @param factor The new treasury factor of the reserve
     */
    event SetTreasuryFactor(uint256 indexed reserveId, uint256 factor);

    /*
     * @dev Emitted on setInterestModelAddress()
     * @param reserveId The ID of the reserve
     * @param interestModelAddress The address of the interest model contract
     */
    event SetInterestModelAddress(uint256 indexed reserveId, address interestModelAddress);

    /*
     * @dev Emitted on openMoneyMarket()
     * @param reserveId The ID of the reserve
     */
    event OpenMoneyMarket(uint256 reserveId);

    /*
     * @dev Emitted on closeMoneyMarket()
     * @param reserveId The ID of the reserve
     */
    event CloseMoneyMarket(uint256 reserveId);

    /*
     * @dev Emitted on deposit()
     * @param reserveId The ID of the reserve
     * @param onBehalfOf The address that will receive the oTokens
     * @param amount The amount of ETH to be deposited
     * @param referralCode integrators are assigned a referral code and can potentially receive rewards
     * 0 if the action is executed directly by the user, without any intermediaries
     */
    event Deposit(uint256 indexed reserveId, address indexed onBehalfOf, uint256 amount, uint256 referralCode);

    /*
     * @dev Emitted on withdraw()
     * @param reserveId The ID of the reserve
     * @param onBehalfOf The address that will receive assets withdrawed
     * @param amount The amount to be withdrawn
     */
    event Withdraw(uint256 indexed reserveId, address indexed onBehalfOf, uint256 amount);

    /*
     * @dev Emitted on borrow()
     * @param reserveId The ID of the reserve
     * @param user The address initiating the withdrawal(), owner of oTokens
     * @param onBehalfOf The address that will receive the ETH and the loan NFT
     * @param loanId The loan ID
     */
    event Borrow(
        uint256 indexed reserveId,
        address user,
        address indexed onBehalfOf,
        uint256 indexed loanId
    );

    /*
     * @dev Emitted on repay()
     * @param reserveId The ID of the reserve
     * @param repayer The address initiating the repayment()
     * @param onBehalfOf The address that will receive the pledged NFT
     * @param loanId The ID of the loan
     * @param repayAmount The borrow balance of the loan when it was repaid
     * @param penalty The penalty of the loan for either early or overdue repayment
     */
    event Repay(
        uint256 indexed reserveId,
        address repayer,
        address indexed onBehalfOf,
        uint256 indexed loanId,
        uint256 repayAmount,
        uint256 penalty
    );

    /*
     * @dev Emitted on extend()
     * @param reserveId The ID of the reserve
     * @param onBehalfOf The owner address of loan NFT
     * @param oldLoanId The ID of the old loan
     * @param newLoanId The ID of the new loan
     */
    event Extend(uint256 indexed reserveId, address indexed onBehalfOf, uint256 oldLoanId, uint256 newLoanId);

    /*
     * @dev Emitted on startLiquidation()
     * @param reserveId The ID of the reserve
     * @param loanId The ID of the loan
     * @param nftAddress The address of the NFT used as collateral
     * @param tokenId The ID of the NFT used as collateral
     * @param operator The address initiating startLiquidation()
     */
    event StartLiquidation(
        uint256 indexed reserveId,
        uint256 indexed loanId,
        address indexed nftAddress,
        uint256 tokenId,
        address operator
    );

    /*
     * @dev Emitted on endLiquidation()
     * @param reserveId The ID of the reserve
     * @param loanId The ID of the loan
     * @param nftAddress The address of the NFT used as collateral
     * @param tokenId The ID of the NFT used as collateral
     * @param operator
     * @param repayAmount The amount used to repay, must be equal to or greater than the borrowBalance, excess part will be shared by all the lenders
     * @param borrowBalance The borrow balance of the loan
     */
    event EndLiquidation(
        uint256 indexed reserveId,
        uint256 indexed loanId,
        address indexed nftAddress,
        uint256 tokenId,
        address operator,
        uint256 repayAmount,
        uint256 borrowBalance
    );

    /**
     * @notice Creates a reserve
     * @dev Only callable by the pool admin role
     * @param underlyingAsset The address of the underlying asset
     * @param name The name of the oToken
     * @param symbol The symbol for the oToken
     * @param decimals The decimals of the oToken
     **/
    function create(
        address underlyingAsset,
        string memory name,
        string memory symbol,
        uint8 decimals
    ) external;

    /**
     * @notice Updates the treasury factor of a reserve
     * @dev Only callable by the pool admin role
     * @param reserveId The ID of the reserve
     * @param factor The new treasury factor of the reserve
     **/
    function setTreasuryFactor(uint256 reserveId, uint256 factor) external;

    /**
     * @notice Updates the interest model address of a reserve
     * @dev Only callable by the pool admin role
     * @param reserveId The ID of the reserve
     * @param interestModelAddress The new address of the interest model contract
     **/
    function setInterestModelAddress(uint256 reserveId, address interestModelAddress) external;

    /**
     * @notice Open the money market
     * @dev Only callable by the emergency admin role
     * @param reserveId The ID of the reserve
     **/
    function openMoneyMarket(uint256 reserveId) external;

    /**
     * @notice Close the money market
     * @dev Only callable by the emergency admin role
     * @param reserveId The ID of the reserve
     **/
    function closeMoneyMarket(uint256 reserveId) external;

    /**
     * @dev Deposits ETH into the reserve.
     * @param reserveId The ID of the reserve
     * @param referralCode integrators are assigned a referral code and can potentially receive rewards
     **/
    function deposit(uint256 reserveId, uint256 amount, address onBehalfOf, uint256 referralCode) external;

    /**
     * @dev withdraws the ETH from reserve.
     * @param reserveId The ID of the reserve
     * @param amount amount of oETH to withdraw and receive native ETH
     **/
    function withdraw(uint256 reserveId, uint256 amount, address onBehalfOf) external;

    /**
     * @dev Borrows ETH from reserve using an NFT as collateral and will receive a loan NFT as receipt.
     * @param reserveId The ID of the reserve
     * @param amount amount of ETH user will borrow
     * @param duration The desired duration of the loan
     * @param nftAddress The collateral NFT address
     * @param tokenId The ID of the NFT
     * @param onBehalfOf address of the user who will receive ETH and loan NFT.
     **/
    function borrow(
        uint256 reserveId,
        uint256 amount,
        uint256 duration,
        address nftAddress,
        uint256 tokenId,
        address onBehalfOf
    ) external returns (uint256);

    /**
     * @dev Repays a loan, as a result the corresponding loan NFT owner will receive the collateralized NFT.
     * @param loanId The ID of the loan the user will repay
     */
    function repay(uint256 loanId) external returns (uint256);

    /**
     * @dev Extends creates a new loan and terminates the old loan.
     * @param loanId The loan ID to extend
     * @param amount The amount of ERC20 token the user will borrow in the new loan
     * @param duration The selected duration the user will borrow in the new loan
     * @param onBehalfOf The address will borrow in the new loan
     **/
    function extend(
        uint256 loanId,
        uint256 amount,
        uint256 duration,
        address onBehalfOf
    ) external returns (uint256, uint256);

    /**
     * @dev Starts liquidation for a loan when it's in LIQUIDATABLE status
     * @param loanId The ID of the loan which will be liquidated
     */
    function startLiquidation(uint256 loanId) external;

    /**
     * @dev Completes liquidation for a loan which will be repaid.
     * @param loanId The ID of the liquidated loan that will be repaid.
     * @param amount The amount of the token that will be repaid.
     */
    function endLiquidation(uint256 loanId, uint256 amount) external;

    /**
     * @dev Returns the state of the reserve
     * @param reserveId The ID of the reserve
     * @return The state of the reserve
     **/
    function getReserveData(uint256 reserveId) external view returns (DataTypes.ReserveData memory);

    /**
     * @dev Returns the normalized income of the reserve
     * @param reserveId The ID of the reserve
     * @return The reserve's normalized income
     */
    function getReserveNormalizedIncome(uint256 reserveId) external view returns (uint256);

    /**
     * @dev Returns the remaining liquidity of the reserve
     * @param reserveId The ID of the reserve
     * @return The reserve's withdrawable balance
     */
    function getAvailableLiquidity(uint256 reserveId) external view returns (uint256);

    /**
     * @dev Returns the instantaneous borrow limit value of a special NFT
     * @param nftAddress The address of the NFT
     * @param tokenId The ID of the NFT
     * @return The NFT's borrow limit
     */
    function getBorrowLimitByOracle(
        uint256 reserveId,
        address nftAddress,
        uint256 tokenId
    ) external view returns (uint256);

    /**
     * @dev Returns the sum of all users borrow balances include borrow interest accrued
     * @param reserveId The ID of the reserve
     * @return The total borrow balance of the reserve
     */
    function getTotalBorrowBalance(uint256 reserveId) external view returns (uint256);

    /**
     * @dev Returns TVL (total value locked) of the reserve.
     * @param reserveId The ID of the reserve
     * @return The reserve's TVL
     */
    function getTVL(uint256 reserveId) external view returns (uint256);
}

// File: contracts/interfaces/IOpenSkyIncentivesController.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.10;

interface IOpenSkyIncentivesController {
    function handleAction(
        address account,
        uint256 userBalance,
        uint256 totalSupply
    ) external;

    function getRewardsBalance(address[] calldata assets, address user) external view returns (uint256);

    function claimRewards(
        address[] calldata assets,
        uint256 amount,
        address to,
        bool stake
    ) external returns (uint256);
}

// File: contracts/interfaces/IOpenSkyMoneyMarket.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

interface IOpenSkyMoneyMarket {

    function depositCall(address asset, uint256 amount) external;

    function withdrawCall(address asset, uint256 amount, address to) external;

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

    function getBalance(address asset, address account) external view returns (uint256);

    function getSupplyRate(address asset) external view returns (uint256);

}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

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

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol



// SPDX-License-Identifier: MIT

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);
}

// File: @openzeppelin/contracts/utils/Address.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

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

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

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

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

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

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

// File: @openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol



// SPDX-License-Identifier: MIT

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.
 */
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].
     */
    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);
}

// File: @openzeppelin/contracts/utils/cryptography/draft-EIP712.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./ECDSA.sol";

/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * _Available since v3.4._
 */
abstract contract EIP712 {
    /* solhint-disable var-name-mixedcase */
    // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
    // invalidate the cached domain separator if the chain id changes.
    bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;
    uint256 private immutable _CACHED_CHAIN_ID;

    bytes32 private immutable _HASHED_NAME;
    bytes32 private immutable _HASHED_VERSION;
    bytes32 private immutable _TYPE_HASH;

    /* solhint-enable var-name-mixedcase */

    /**
     * @dev Initializes the domain separator and parameter caches.
     *
     * The meaning of `name` and `version` is specified in
     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
     *
     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
     * - `version`: the current major version of the signing domain.
     *
     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
     * contract upgrade].
     */
    constructor(string memory name, string memory version) {
        bytes32 hashedName = keccak256(bytes(name));
        bytes32 hashedVersion = keccak256(bytes(version));
        bytes32 typeHash = keccak256(
            "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
        );
        _HASHED_NAME = hashedName;
        _HASHED_VERSION = hashedVersion;
        _CACHED_CHAIN_ID = block.chainid;
        _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion);
        _TYPE_HASH = typeHash;
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        if (block.chainid == _CACHED_CHAIN_ID) {
            return _CACHED_DOMAIN_SEPARATOR;
        } else {
            return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
        }
    }

    function _buildDomainSeparator(
        bytes32 typeHash,
        bytes32 nameHash,
        bytes32 versionHash
    ) private view returns (bytes32) {
        return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this)));
    }

    /**
     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
     * function returns the hash of the fully encoded EIP712 message for this domain.
     *
     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
     *
     * ```solidity
     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
     *     keccak256("Mail(address to,string contents)"),
     *     mailTo,
     *     keccak256(bytes(mailContents))
     * )));
     * address signer = ECDSA.recover(digest, signature);
     * ```
     */
    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
        return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash);
    }
}

// File: @openzeppelin/contracts/utils/cryptography/ECDSA.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s;
        uint8 v;
        assembly {
            s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
            v := add(shr(255, vs), 27)
        }
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

// File: @openzeppelin/contracts/utils/Counters.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

// File: contracts/libraries/helpers/Errors.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

library Errors {
    // common
    string public constant MATH_MULTIPLICATION_OVERFLOW = '100';
    string public constant MATH_ADDITION_OVERFLOW = '101';
    string public constant MATH_DIVISION_BY_ZERO = '102';

    string public constant ETH_TRANSFER_FAILED = '110';
    string public constant RECEIVE_NOT_ALLOWED = '111';
    string public constant FALLBACK_NOT_ALLOWED = '112';
    string public constant APPROVAL_FAILED = '113';

    // setting/factor
    string public constant SETTING_ZERO_ADDRESS_NOT_ALLOWED = '115';
    string public constant SETTING_RESERVE_FACTOR_NOT_ALLOWED = '116';
    string public constant SETTING_WHITELIST_INVALID_RESERVE_ID = '117';
    string public constant SETTING_WHITELIST_NFT_ADDRESS_IS_ZERO = '118';
    string public constant SETTING_WHITELIST_NFT_DURATION_OUT_OF_ORDER = '119';
    string public constant SETTING_WHITELIST_NFT_NAME_EMPTY = '120';
    string public constant SETTING_WHITELIST_NFT_SYMBOL_EMPTY = '121';
    string public constant SETTING_WHITELIST_NFT_LTV_NOT_ALLOWED = '122';

    // settings/acl
    string public constant ACL_ONLY_GOVERNANCE_CAN_CALL = '200';
    string public constant ACL_ONLY_EMERGENCY_ADMIN_CAN_CALL = '201';
    string public constant ACL_ONLY_POOL_ADMIN_CAN_CALL = '202';
    string public constant ACL_ONLY_LIQUIDATOR_CAN_CALL = '203';
    string public constant ACL_ONLY_AIRDROP_OPERATOR_CAN_CALL = '204';
    string public constant ACL_ONLY_POOL_CAN_CALL = '205';

    // lending & borrowing
    // reserve
    string public constant RESERVE_DOES_NOT_EXIST = '300';
    string public constant RESERVE_LIQUIDITY_INSUFFICIENT = '301';
    string public constant RESERVE_INDEX_OVERFLOW = '302';
    string public constant RESERVE_SWITCH_MONEY_MARKET_STATE_ERROR = '303';
    string public constant RESERVE_TREASURY_FACTOR_NOT_ALLOWED = '304';
    string public constant RESERVE_TOKEN_CAN_NOT_BE_CLAIMED = '305';

    // token
    string public constant AMOUNT_SCALED_IS_ZERO = '310';
    string public constant AMOUNT_TRANSFER_OVERFLOW = '311';

    //deposit
    string public constant DEPOSIT_AMOUNT_SHOULD_BE_BIGGER_THAN_ZERO = '320';

    // withdraw
    string public constant WITHDRAW_AMOUNT_NOT_ALLOWED = '321';
    string public constant WITHDRAW_LIQUIDITY_NOT_SUFFICIENT = '322';

    // borrow
    string public constant BORROW_DURATION_NOT_ALLOWED = '330';
    string public constant BORROW_AMOUNT_EXCEED_BORROW_LIMIT = '331';
    string public constant NFT_ADDRESS_IS_NOT_IN_WHITELIST = '332';

    // repay
    string public constant REPAY_STATUS_ERROR = '333';
    string public constant REPAY_MSG_VALUE_ERROR = '334';

    // extend
    string public constant EXTEND_STATUS_ERROR = '335';
    string public constant EXTEND_MSG_VALUE_ERROR = '336';

    // liquidate
    string public constant START_LIQUIDATION_STATUS_ERROR = '360';
    string public constant END_LIQUIDATION_STATUS_ERROR = '361';
    string public constant END_LIQUIDATION_AMOUNT_ERROR = '362';

    // loan
    string public constant LOAN_DOES_NOT_EXIST = '400';
    string public constant LOAN_SET_STATUS_ERROR = '401';
    string public constant LOAN_REPAYER_IS_NOT_OWNER = '402';
    string public constant LOAN_LIQUIDATING_STATUS_CAN_NOT_BE_UPDATED = '403';
    string public constant LOAN_CALLER_IS_NOT_OWNER = '404';
    string public constant LOAN_COLLATERAL_NFT_CAN_NOT_BE_CLAIMED = '405';

    string public constant FLASHCLAIM_EXECUTOR_ERROR = '410';
    string public constant FLASHCLAIM_STATUS_ERROR = '411';

    // money market
    string public constant MONEY_MARKET_DEPOSIT_AMOUNT_NOT_ALLOWED = '500';
    string public constant MONEY_MARKET_WITHDRAW_AMOUNT_NOT_ALLOWED = '501';
    string public constant MONEY_MARKET_APPROVAL_FAILED = '502';
    string public constant MONEY_MARKET_DELEGATE_CALL_ERROR = '503';
    string public constant MONEY_MARKET_REQUIRE_DELEGATE_CALL = '504';
    string public constant MONEY_MARKET_WITHDRAW_AMOUNT_NOT_MATCH = '505';

    // price oracle
    string public constant PRICE_ORACLE_HAS_NO_PRICE_FEED = '600';
    string public constant PRICE_ORACLE_INCORRECT_TIMESTAMP = '601';
    string public constant PRICE_ORACLE_PARAMS_ERROR = '602';
}

// File: contracts/libraries/types/DataTypes.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

library DataTypes {
    struct ReserveData {
        uint256 reserveId;
        address underlyingAsset;
        address oTokenAddress;
        address moneyMarketAddress;
        uint128 lastSupplyIndex;
        uint256 borrowingInterestPerSecond;
        uint256 lastMoneyMarketBalance;
        uint40 lastUpdateTimestamp;
        uint256 totalBorrows;
        address interestModelAddress;
        uint256 treasuryFactor;
        bool isMoneyMarketOn;
    }

    struct LoanData {
        uint256 reserveId;
        address nftAddress;
        uint256 tokenId;
        address borrower;
        uint256 amount;
        uint128 borrowRate;
        uint128 interestPerSecond;
        uint40 borrowBegin;
        uint40 borrowDuration;
        uint40 borrowOverdueTime;
        uint40 liquidatableTime;
        uint40 extendableTime;
        uint40 borrowEnd;
        LoanStatus status;
    }

    enum LoanStatus {
        NONE,
        BORROWING,
        EXTENDABLE,
        OVERDUE,
        LIQUIDATABLE,
        LIQUIDATING
    }

    struct WhitelistInfo {
        bool enabled;
        string name;
        string symbol;
        uint256 LTV;
        uint256 minBorrowDuration;
        uint256 maxBorrowDuration;
        uint256 extendableDuration;
        uint256 overdueDuration;
    }
}