// File: contracts/libs/@openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

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

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

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev 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 anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

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

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

// File: contracts/libs/@openzeppelin/contracts/interfaces/IERC1363Receiver.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC1363Receiver.sol)

pragma solidity ^0.8.0;

interface IERC1363Receiver {
    /*
     * Note: the ERC-165 identifier for this interface is 0x88a7ca5c.
     * 0x88a7ca5c === bytes4(keccak256("onTransferReceived(address,address,uint256,bytes)"))
     */

    /**
     * @notice Handle the receipt of ERC1363 tokens
     * @dev Any ERC1363 smart contract calls this function on the recipient
     * after a `transfer` or a `transferFrom`. This function MAY throw to revert and reject the
     * transfer. Return of other than the magic value MUST result in the
     * transaction being reverted.
     * Note: the token contract address is always the message sender.
     * @param operator address The address which called `transferAndCall` or `transferFromAndCall` function
     * @param from address The address which are token transferred from
     * @param value uint256 The amount of tokens transferred
     * @param data bytes Additional data with no specified format
     * @return `bytes4(keccak256("onTransferReceived(address,address,uint256,bytes)"))`
     *  unless throwing
     */
    function onTransferReceived(
        address operator,
        address from,
        uint256 value,
        bytes memory data
    ) external returns (bytes4);
}

// File: contracts/libs/@openzeppelin/contracts/interfaces/IERC1363Spender.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC1363Spender.sol)

pragma solidity ^0.8.0;

interface IERC1363Spender {
    /*
     * Note: the ERC-165 identifier for this interface is 0x7b04a2d0.
     * 0x7b04a2d0 === bytes4(keccak256("onApprovalReceived(address,uint256,bytes)"))
     */

    /**
     * @notice Handle the approval of ERC1363 tokens
     * @dev Any ERC1363 smart contract calls this function on the recipient
     * after an `approve`. This function MAY throw to revert and reject the
     * approval. Return of other than the magic value MUST result in the
     * transaction being reverted.
     * Note: the token contract address is always the message sender.
     * @param owner address The address which called `approveAndCall` function
     * @param value uint256 The amount of tokens to be spent
     * @param data bytes Additional data with no specified format
     * @return `bytes4(keccak256("onApprovalReceived(address,uint256,bytes)"))`
     *  unless throwing
     */
    function onApprovalReceived(
        address owner,
        uint256 value,
        bytes memory data
    ) external returns (bytes4);
}

// File: contracts/libs/@openzeppelin/contracts/security/ReentrancyGuard.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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.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:
     *
     * - `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;
        }
        _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;
        _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 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 {}
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/extensions/draft-ERC20Permit.sol)

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 constant _PERMIT_TYPEHASH =
        keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    /**
     * @dev In previous versions `_PERMIT_TYPEHASH` was declared as `immutable`.
     * However, to ensure consistency with the upgradeable transpiler, we will continue
     * to reserve a slot.
     * @custom:oz-renamed-from _PERMIT_TYPEHASH
     */
    // solhint-disable-next-line var-name-mixedcase
    bytes32 private _PERMIT_TYPEHASH_DEPRECATED_SLOT;

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-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.
 */
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: contracts/libs/@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol



// 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);
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (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);
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-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;

    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));
        }
    }

    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");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: contracts/libs/@openzeppelin/contracts/token/ERC721/IERC721.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

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

    /**
     * @dev 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);
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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
     * ====
     *
     * [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://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
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

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



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

pragma solidity ^0.8.0;

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

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

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



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

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library 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/libs/@openzeppelin/contracts/utils/cryptography/draft-EIP712.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/draft-EIP712.sol)

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;
    address private immutable _CACHED_THIS;

    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);
        _CACHED_THIS = address(this);
        _TYPE_HASH = typeHash;
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        if (address(this) == _CACHED_THIS && 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: contracts/libs/@openzeppelin/contracts/utils/cryptography/ECDSA.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.3) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

/**
 * @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) {
        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.
            /// @solidity memory-safe-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 {
            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 = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        uint8 v = uint8((uint256(vs) >> 255) + 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 Message, created from `s`. 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(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @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: contracts/libs/@openzeppelin/contracts/utils/introspection/IERC165.sol



// 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);
}

// File: contracts/libs/@openzeppelin/contracts/utils/Strings.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_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) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

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

    /**
     * @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);
    }
}

// File: contracts/libs/metatx/ERC2771ContextFromStorage.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

/// @notice OpenZeppelin Contracts (last updated v4.7.0) (metatx/ERC2771Context.sol)
import "../../libs/@openzeppelin/contracts/utils/Context.sol";

/**
 * @dev Context variant with ERC2771 support using a non-immutable storage variable.
 */
abstract contract ERC2771ContextFromStorage is Context {
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
    address internal _trustedForwarder;

    event NewTrustedForwarder(address indexed trustedForwarder);

    /// @custom:oz-upgrades-unsafe-allow constructor
    constructor(address trustedForwarder) {
        _trustedForwarder = trustedForwarder;
    }

    function isTrustedForwarder(address forwarder) public view virtual returns (bool) {
        return forwarder == _trustedForwarder;
    }

    function _msgSender() internal view virtual override returns (address sender) {
        if (isTrustedForwarder(msg.sender)) {
            // The assembly code is more direct than the Solidity version using `abi.decode`.
            /// @solidity memory-safe-assembly
            assembly {
                sender := shr(96, calldataload(sub(calldatasize(), 20)))
            }
        } else {
            return super._msgSender();
        }
    }

    function _msgData() internal view virtual override returns (bytes calldata) {
        if (isTrustedForwarder(msg.sender)) {
            return msg.data[:msg.data.length - 20];
        } else {
            return super._msgData();
        }
    }
}

// File: contracts/market/AsksV1.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

import "../libs/@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "../libs/@openzeppelin/contracts/access/Ownable.sol";
import "../libs/@openzeppelin/contracts/token/ERC20/extensions/draft-ERC20Permit.sol";
import "../libs/@openzeppelin/contracts/interfaces/IERC1363Receiver.sol";
import "../libs/@openzeppelin/contracts/interfaces/IERC1363Spender.sol";
import {IERC721} from "../libs/@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "./interfaces/IAsks.sol";
import "./interfaces/IRoyaltyFeeManager.sol";
import "./interfaces/ICurrencyManager.sol";
import "./interfaces/ICollectionManager.sol";
import "../libs/metatx/ERC2771ContextFromStorage.sol";
import "./lib/IncomingTransferSupportV1.sol";
import "./lib/OutgoingTransferSupportV1.sol";
import "./lib/transferHelpers/ERC721TransferHelper.sol";
import "./lib/UniversalExchangeEventV1.sol";

// import '../../lib/forge-std/src/console.sol';

/**
 * @title AsksV1
 * @notice It allows sellers to list an owned ERC-721 token for sale for a given price in a given currency, and allows buyers to purchase from those asks
 */
contract AsksV1 is
    IAsks,
    IERC1363Receiver,
    IERC1363Spender,
    Ownable,
    ReentrancyGuard,
    ERC2771ContextFromStorage,
    UniversalExchangeEventV1,
    IncomingTransferSupportV1,
    OutgoingTransferSupportV1
{
    using SafeERC20 for IERC20;
    using SafeERC20 for IERC20Permit;

    /// @dev The indicator to pass all remaining gas when paying out royalties
    uint256 private constant USE_ALL_GAS_FLAG = 0;

    /// @notice The ask for a given NFT, if one exists
    /// @dev ERC-721 token contract => ERC-721 token ID => Ask
    mapping(address => mapping(uint256 => Ask)) public askForNFT;

    uint256 public fee;

    address public protocolFeeRecipient;

    IRoyaltyFeeManager public royaltyFeeManager;

    ICurrencyManager public currencyManager;

    ICollectionManager public collectionManager;

    ERC721TransferHelper public erc721TransferHelper;

    /**
     * @param _fee decimal 4. Override _feeDenominator() to change.
     * @param _protocolFeeRecipient address to get protocol fee
     * @param _erc20TransferHelper address of ERC20TransferHelper
     * @param _erc721TransferHelper address of ERC721TransferHelper
     * @param _royaltyFeeManager address of RoyaltyFeeManager
     * @param _currencyManager address of CurrencyManager
     * @param _trustedForwarder an argument for ERC2771Context
     * @param _wethAddress address of WETH
     */
    constructor(
        uint256 _fee,
        address _protocolFeeRecipient,
        address _erc20TransferHelper,
        address _erc721TransferHelper,
        address _royaltyFeeManager,
        address _currencyManager,
        address _collectionManager,
        address _trustedForwarder,
        address _wethAddress
    )
        ERC2771ContextFromStorage(_trustedForwarder)
        IncomingTransferSupportV1(_erc20TransferHelper)
        OutgoingTransferSupportV1(_wethAddress)
    {
        fee = _fee;
        protocolFeeRecipient = _protocolFeeRecipient;
        royaltyFeeManager = IRoyaltyFeeManager(_royaltyFeeManager);
        currencyManager = ICurrencyManager(_currencyManager);
        collectionManager = ICollectionManager(_collectionManager);
        erc721TransferHelper = ERC721TransferHelper(_erc721TransferHelper);
    }

    /// @notice Create the ask for a given NFT
    /// @param _tokenContract the address of the NFT contract.
    /// @param _askCurrency the address of the payment currency contract. address(0) means ETH.
    /// @dev
    /// - The owner or operator of a NFT can create an ask for it.
    /// - _tokenContract should be whitelisted in `CollectionManager`.
    /// - _askCurrency should be whitelisted in `CurrencyManager`.
    /// - No implementation of `createAskWithPermit` because the address saved in `_tokenContract.getApproved(_tokenId)` might change when the ask is filled.
    function createAsk(
        address _tokenContract,
        uint256 _tokenId,
        uint256 _askPrice,
        address _askCurrency,
        uint96 _expiry
    ) external override nonReentrant {
        require(_askPrice > 0, "ask.askPrice should be bigger than 0");
        require(_expiry > block.timestamp, "ask.expiry must be bigger than block.timestamp");

        address tokenOwner = IERC721(_tokenContract).ownerOf(_tokenId);
        require(
            _msgSender() == tokenOwner || IERC721(_tokenContract).isApprovedForAll(tokenOwner, _msgSender()),
            "createAsk must be token owner or operator"
        );
        require(erc721TransferHelper.isModuleRegistered(), "createAsk must approve AsksV1 module");
        require(
            IERC721(_tokenContract).isApprovedForAll(tokenOwner, address(erc721TransferHelper)),
            "createAsk must approve ERC721TransferHelper as operator"
        );
        // Verify whether the currency is whitelisted
        require(currencyManager.isCurrencyWhitelisted(_askCurrency), "ask.currency must be whitelisted");
        require(collectionManager.isTokenWhitelisted(_tokenContract), "ask.tokenContract must be whitelisted");

        if (askForNFT[_tokenContract][_tokenId].seller != address(0)) {
            _cancelAsk(_tokenContract, _tokenId);
        }

        askForNFT[_tokenContract][_tokenId] = Ask({
            seller: tokenOwner,
            askCurrency: _askCurrency,
            askPrice: _askPrice,
            expiry: _expiry
        });

        emit AskCreated(_tokenContract, _tokenId, askForNFT[_tokenContract][_tokenId]);
    }

    /// @notice Update the ask price for a given NFT
    /// @param _askCurrency address(0x0) means ETH.
    function updateAsk(
        address _tokenContract,
        uint256 _tokenId,
        uint256 _askPrice,
        address _askCurrency,
        uint96 _expiry
    ) external override nonReentrant {
        Ask storage ask = askForNFT[_tokenContract][_tokenId];

        require(ask.seller == _msgSender(), "updateAsk must be seller");
        require(_askPrice > 0, "ask.askPrice should be bigger than 0");
        require(currencyManager.isCurrencyWhitelisted(_askCurrency), "ask.askCurrency must be whitelisted");
        require(_expiry > block.timestamp, "ask.expiry must be bigger than block.timestamp");

        ask.askPrice = _askPrice;
        ask.askCurrency = _askCurrency;
        ask.expiry = _expiry;

        emit AskUpdated(_tokenContract, _tokenId, ask);
    }

    /// @notice Cancel the ask for a given NFT
    function cancelAsk(address _tokenContract, uint256 _tokenId) external nonReentrant {
        require(askForNFT[_tokenContract][_tokenId].seller != address(0), "cancelAsk ask doesn't exist");

        address tokenOwner = IERC721(_tokenContract).ownerOf(_tokenId);
        require(
            _msgSender() == tokenOwner || IERC721(_tokenContract).isApprovedForAll(tokenOwner, _msgSender()),
            "cancelAsk must be token owner or operator"
        );

        _cancelAsk(_tokenContract, _tokenId);
    }

    /// @notice Fill the ask for a given NFT
    /// @dev
    /// 1. Handle incoming payment (eth or erc20)
    /// 2. Transfer royalty
    /// 3. Transfer protocol fee
    /// 4. Transfer the rest to the seller
    /// 5. ERC721 transfer to the buyer
    /// 6. Delete the ask from the storage
    function fillAsk(
        address _tokenContract,
        uint256 _tokenId,
        address _fillCurrency,
        uint256 _fillAmount
    ) external payable override nonReentrant {
        _validateAsk(_tokenContract, _tokenId, _fillCurrency, _fillAmount);
        _fillAsk(_msgSender(), false, _tokenContract, _tokenId);
    }

    /// @notice Fill the ask for a given NFT using ERC20 permit signature
    function fillAskWithPermit(
        address _tokenContract,
        uint256 _tokenId,
        address _fillCurrency,
        uint256 _fillAmount,
        uint256 _deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external override nonReentrant {
        _validateAsk(_tokenContract, _tokenId, _fillCurrency, _fillAmount);
        IERC20Permit(_fillCurrency).safePermit(
            _msgSender(),
            address(erc20TransferHelper),
            _fillAmount,
            _deadline,
            v,
            r,
            s
        );
        _fillAsk(_msgSender(), false, _tokenContract, _tokenId);
    }

    /// @notice Set the trusted forwarder to use in ERC2771ContextFromStorage
    /// @param _forwarder new forwarder address
    function setTrustedForwarder(address _forwarder) external onlyOwner {
        if (_forwarder == address(0)) revert AddressZero();
        _trustedForwarder = _forwarder;
        emit NewTrustedForwarder(_forwarder);
    }

    /**
     * @notice Update erc721 transfer helper
     * @param _erc721TransferHelper new erc721 transfer helper address
     */
    function updateERC721TransferHelper(address _erc721TransferHelper) external onlyOwner {
        if (_erc721TransferHelper == address(0)) revert AddressZero();
        erc721TransferHelper = ERC721TransferHelper(_erc721TransferHelper);
        emit NewERC721TransferHelper(_erc721TransferHelper);
    }

    /**
     * @notice Update currency manager
     * @param _currencyManager new currency manager
     */
    function updateCurrencyManager(address _currencyManager) external onlyOwner {
        if (_currencyManager == address(0)) revert AddressZero();
        currencyManager = ICurrencyManager(_currencyManager);
        emit NewCurrencyManager(_currencyManager);
    }

    /**
     * @notice Update collection manager
     * @param _collectionManager new collection manager
     */
    function updateCollectionManager(address _collectionManager) external onlyOwner {
        if (_collectionManager == address(0)) revert AddressZero();
        collectionManager = ICollectionManager(_collectionManager);
        emit NewCollectionManager(_collectionManager);
    }

    /**
     * @notice Update protocol fee recipient
     * @param _protocolFeeRecipient new recipient for protocol fees
     * @param _fee new protocol fee. decimal is determined by  `_feeDenominator()`
     * @dev   To eliminate protocol fee, set _fee as zero.
     */
    function updateProtocolFee(address _protocolFeeRecipient, uint256 _fee) external onlyOwner {
        if (_protocolFeeRecipient == address(0)) revert AddressZero();
        protocolFeeRecipient = _protocolFeeRecipient;
        fee = _fee;
        emit NewProtocolFee(_protocolFeeRecipient, _fee);
    }

    /**
     * @notice Update royalty fee manager
     * @param _royaltyFeeManager new fee manager address
     */
    function updateRoyaltyFeeManager(address _royaltyFeeManager) external onlyOwner {
        if (_royaltyFeeManager == address(0)) revert AddressZero();
        royaltyFeeManager = IRoyaltyFeeManager(_royaltyFeeManager);
        emit NewRoyaltyFeeManager(_royaltyFeeManager);
    }

    event TransferReceived(address token, address operator, address from, uint256 amount, bytes data);
    event ApprovalReceived(address token, address owner, uint256 amount, bytes data);

    modifier onlyPayment() {
        require(currencyManager.isCurrencyWhitelisted(_msgSender()), "Asks: only whitelisted payment");
        _;
    }

    function onTransferReceived(
        address _sender,
        address _from,
        uint256 _amount,
        bytes calldata _data
    ) external override nonReentrant returns (bytes4) {
        emit TransferReceived(msg.sender, _sender, _from, _amount, _data);

        bytes4 selector = bytes4(_data[:4]);
        bytes calldata data = _data[4:];
        if (selector == this.fillAsk.selector) {
            (address _tokenContract, uint256 _tokenId, address _fillCurrency, uint256 _fillAmount) = abi.decode(
                data,
                (address, uint256, address, uint256)
            );
            require(_fillCurrency == msg.sender, "onTransferReceived: invalid fillCurrency");
            require(_fillAmount == _amount, "onTransferReceived: invalid fillAmount");

            _validateAsk(_tokenContract, _tokenId, _fillCurrency, _fillAmount);
            // nft will be transferred to actual token payer in case of transferFromAndCall
            _fillAsk(_from, true, _tokenContract, _tokenId);
        } else {
            revert("onTransferReceived: function selector not supported");
        }
        return this.onTransferReceived.selector;
    }

    function onApprovalReceived(
        address _owner,
        uint256 _amount,
        bytes calldata _data
    ) external override nonReentrant returns (bytes4) {
        emit ApprovalReceived(msg.sender, _owner, _amount, _data);

        bytes4 selector = bytes4(_data[:4]);
        bytes memory data = _data[4:];
        if (selector == this.fillAsk.selector) {
            (address _tokenContract, uint256 _tokenId, address _fillCurrency, uint256 _fillAmount) = abi.decode(
                data,
                (address, uint256, address, uint256)
            );
            require(_fillCurrency == msg.sender, "onApprovalReceived: invalid fillCurrency");
            require(_fillAmount == _amount, "onApprovalReceived: invalid fillAmount");

            IERC20 token = IERC20(_fillCurrency);
            uint256 beforeBalance = token.balanceOf(address(this));
            // can't use incomingTransferSupportV1 because the spender address of approveAndCall must be this contract
            token.safeTransferFrom(_owner, address(this), _fillAmount);
            uint256 afterBalance = token.balanceOf(address(this));
            require(beforeBalance + _fillAmount == afterBalance, "onApprovalReceived: invalid token transfer amount");

            _validateAsk(_tokenContract, _tokenId, _fillCurrency, _fillAmount);
            _fillAsk(_owner, true, _tokenContract, _tokenId);
        } else {
            revert("onApprovalReceived: function selector not supported");
        }
        return this.onApprovalReceived.selector;
    }

    // ************* internal functions *************
    function _validateAsk(
        address _tokenContract,
        uint256 _tokenId,
        address _fillCurrency,
        uint256 _fillAmount
    ) private {
        Ask storage ask = askForNFT[_tokenContract][_tokenId];

        require(ask.seller != address(0), "fillAsk must be active ask");
        require(ask.askCurrency == _fillCurrency, "fillAsk _fillCurrency must match ask currency");
        require(ask.askPrice == _fillAmount, "fillAsk _fillAmount must match ask amount");
        require(block.timestamp <= ask.expiry, "fillAsk ask has expired");
        require(ask.askCurrency == address(0) || msg.value == 0, "fillAsk askCurrency is not ETH");
    }

    function _fillAsk(address _from, bool _isPaid, address _tokenContract, uint256 _tokenId) private {
        Ask storage ask = askForNFT[_tokenContract][_tokenId];

        // Ensure ETH/ERC-20 payment from buyer is valid and take custody
        if (!_isPaid) {
            _handleIncomingTransfer(_from, ask.askPrice, ask.askCurrency);
        }

        uint256 royaltyPaid = _handleRoyaltyPayout(
            _tokenContract,
            _tokenId,
            ask.askPrice,
            ask.askCurrency,
            USE_ALL_GAS_FLAG
        );

        uint256 protocolFeePaid = (ask.askPrice * fee) / _feeDenominator();

        require(ask.askPrice >= royaltyPaid + protocolFeePaid, "fillAsk askPrice must be bigger than royalty + fee");

        _handleOutgoingTransfer(protocolFeeRecipient, protocolFeePaid, ask.askCurrency, USE_ALL_GAS_FLAG);

        // Transfer remaining ETH/ERC-20 to seller
        _handleOutgoingTransfer(
            ask.seller,
            ask.askPrice - royaltyPaid - protocolFeePaid,
            ask.askCurrency,
            USE_ALL_GAS_FLAG
        );

        // Transfer NFT to buyer
        erc721TransferHelper.transferFrom(_tokenContract, ask.seller, _from, _tokenId);

        ExchangeDetails memory userAExchangeDetails = ExchangeDetails({
            tokenContract: _tokenContract,
            tokenId: _tokenId,
            amount: 1
        });
        ExchangeDetails memory userBExchangeDetails = ExchangeDetails({
            tokenContract: ask.askCurrency,
            tokenId: 0,
            amount: ask.askPrice
        });

        emit ExchangeExecuted(ask.seller, _from, userAExchangeDetails, userBExchangeDetails);
        emit AskFilled(_tokenContract, _tokenId, _from, ask, royaltyPaid, protocolFeePaid);

        delete askForNFT[_tokenContract][_tokenId];
    }

    function _cancelAsk(address _tokenContract, uint256 _tokenId) private {
        emit AskCancelled(_tokenContract, _tokenId, askForNFT[_tokenContract][_tokenId]);
        delete askForNFT[_tokenContract][_tokenId];
    }

    function _handleRoyaltyPayout(
        address _tokenContract,
        uint256 _tokenId,
        uint256 _amount,
        address _payoutCurrency,
        uint256 _gasLimit
    ) internal returns (uint256) {
        (address royaltyFeeRecipient, uint256 royaltyFeeAmount) = royaltyFeeManager.calculateRoyaltyFeeAndGetRecipient(
            _tokenContract,
            _tokenId,
            _amount
        );

        // Check if there is a royalty fee and that it is different to 0
        if ((royaltyFeeRecipient != address(0)) && (royaltyFeeAmount != 0)) {
            _handleOutgoingTransfer(royaltyFeeRecipient, royaltyFeeAmount, _payoutCurrency, _gasLimit);

            emit RoyaltyPayout(_tokenContract, _tokenId, royaltyFeeRecipient, _payoutCurrency, royaltyFeeAmount);

            return royaltyFeeAmount;
        } else {
            return 0;
        }
    }

    function _feeDenominator() internal pure virtual returns (uint96) {
        return 10000;
    }

    function _msgSender() internal view virtual override(Context, ERC2771ContextFromStorage) returns (address sender) {
        return super._msgSender();
    }

    function _msgData() internal view virtual override(Context, ERC2771ContextFromStorage) returns (bytes calldata) {
        return super._msgData();
    }
}

// File: contracts/market/interfaces/IAsks.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

interface IAsks {
    function createAsk(
        address _tokenContract,
        uint256 _tokenId,
        uint256 _askPrice,
        address _askCurrency,
        uint96 _expiry
    ) external;

    function updateAsk(
        address _tokenContract,
        uint256 _tokenId,
        uint256 _askPrice,
        address _askCurrency,
        uint96 _expiry
    ) external;

    function cancelAsk(address _tokenContract, uint256 _tokenId) external;

    function fillAsk(
        address _tokenContract,
        uint256 _tokenId,
        address _fillCurrency,
        uint256 _fillAmount
    ) external payable;

    function fillAskWithPermit(
        address _tokenContract,
        uint256 _tokenId,
        address _fillCurrency,
        uint256 _fillAmount,
        uint256 _deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /// @notice The metadata for an ask
    /// @param seller The address of the seller placing the ask
    /// @param askCurrency The address of the ERC-20, or address(0) for ETH, required to fill the ask
    /// @param askPrice The price to fill the ask
    struct Ask {
        address seller;
        address askCurrency;
        uint96 expiry;
        uint256 askPrice;
    }

    /// @notice Emitted when an ask is created
    /// @param tokenContract The ERC-721 token address of the created ask
    /// @param tokenId The ERC-721 token ID of the created ask
    /// @param ask The metadata of the created ask
    event AskCreated(address indexed tokenContract, uint256 indexed tokenId, Ask ask);

    /// @notice Emitted when an ask price is updated
    /// @param tokenContract The ERC-721 token address of the updated ask
    /// @param tokenId The ERC-721 token ID of the updated ask
    /// @param ask The metadata of the updated ask
    event AskUpdated(address indexed tokenContract, uint256 indexed tokenId, Ask ask);

    /// @notice Emitted when an ask is canceled
    /// @param tokenContract The ERC-721 token address of the canceled ask
    /// @param tokenId The ERC-721 token ID of the canceled ask
    /// @param ask The metadata of the canceled ask
    event AskCancelled(address indexed tokenContract, uint256 indexed tokenId, Ask ask);

    /// @notice Emitted when an ask is filled
    /// @param tokenContract The ERC-721 token address of the filled ask
    /// @param tokenId The ERC-721 token ID of the filled ask
    /// @param buyer The buyer address of the filled ask
    /// @param ask The metadata of the filled ask
    event AskFilled(
        address indexed tokenContract,
        uint256 indexed tokenId,
        address indexed buyer,
        Ask ask,
        uint256 royaltyPayout,
        uint256 feePayout
    );

    /// @notice Emitted when currencyManager is changed
    event NewCurrencyManager(address currencyManager);

    /// @notice Emitted when collectionManager is changed
    event NewCollectionManager(address collectionManager);

    /// @notice Emitted when protocolFeeRecipient is changed
    event NewProtocolFee(address protocolFeeRecipient, uint256 fee);

    /// @notice Emitted when royaltyFeeManager is changed
    event NewRoyaltyFeeManager(address royaltyFeeManager);

    /// @notice Emitted when erc721TransferHelper is changed
    event NewERC721TransferHelper(address erc721TransferHelper);

    /// @notice Emitted when royalties are paid
    /// @param tokenContract The ERC-721 token address of the royalty payout
    /// @param tokenId The ERC-721 token ID of the royalty payout
    /// @param recipient The recipient address of the royalty
    /// @param currency The currency address of the royalty
    /// @param amount The amount paid to the recipient
    event RoyaltyPayout(
        address indexed tokenContract,
        uint256 indexed tokenId,
        address recipient,
        address currency,
        uint256 amount
    );

    error AddressZero();
}

// File: contracts/market/interfaces/ICollectionManager.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

interface ICollectionManager {
    function addToken(address token) external;

    function removeToken(address token) external;

    function isTokenWhitelisted(address token) external view returns (bool);

    function viewWhitelistedTokens(uint256 cursor, uint256 size) external view returns (address[] memory, uint256);

    function viewCountWhitelistedTokens() external view returns (uint256);
}

// File: contracts/market/interfaces/ICurrencyManager.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

interface ICurrencyManager {
    function addCurrency(address currency) external;

    function removeCurrency(address currency) external;

    function isCurrencyWhitelisted(address currency) external view returns (bool);

    function viewWhitelistedCurrencies(uint256 cursor, uint256 size)
        external
        view
        returns (address[] memory, uint256);

    function viewCountWhitelistedCurrencies() external view returns (uint256);
}

// File: contracts/market/interfaces/IRoyaltyFeeManager.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

interface IRoyaltyFeeManager {
    function calculateRoyaltyFeeAndGetRecipient(address collection, uint256 tokenId, uint256 amount)
        external
        view
        returns (address, uint256);
}

// File: contracts/market/lib/IncomingTransferSupportV1.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

import {IERC20} from "../../libs/@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {SafeERC20} from "../../libs/@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {Context} from "../../libs/@openzeppelin/contracts/utils/Context.sol";
import {ERC20TransferHelper} from "./transferHelpers/ERC20TransferHelper.sol";

contract IncomingTransferSupportV1 is Context {
    using SafeERC20 for IERC20;

    ERC20TransferHelper public immutable erc20TransferHelper;

    constructor(address _erc20TransferHelper) {
        erc20TransferHelper = ERC20TransferHelper(_erc20TransferHelper);
    }

    /// @notice Handle an incoming funds transfer, ensuring the sent amount is valid and the sender is solvent
    /// @param _amount The amount to be received
    /// @param _currency The currency to receive funds in, or address(0) for ETH
    function _handleIncomingTransfer(address _from, uint256 _amount, address _currency) internal {
        if (_currency == address(0)) {
            require(msg.value >= _amount, "_handleIncomingTransfer msg value less than expected amount");
        } else {
            // We must check the balance that was actually transferred to this contract,
            // as some tokens impose a transfer fee and would not actually transfer the
            // full amount to the market, resulting in potentally locked funds
            IERC20 token = IERC20(_currency);
            uint256 beforeBalance = token.balanceOf(address(this));
            erc20TransferHelper.safeTransferFrom(_currency, _from, address(this), _amount);
            uint256 afterBalance = token.balanceOf(address(this));
            require(
                beforeBalance + _amount == afterBalance,
                "_handleIncomingTransfer token transfer call did not transfer expected amount"
            );
        }
    }
}

// File: contracts/market/lib/IWETH.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

import {IERC20} from "../../libs/@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IWETH is IERC20 {
    function deposit() external payable;

    function withdraw(uint256 wad) external;
}

// File: contracts/market/lib/OutgoingTransferSupportV1.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

import {IERC20} from "../../libs/@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {SafeERC20} from "../../libs/@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

import {IWETH} from "./IWETH.sol";

/// @title OutgoingTransferSupportV1
contract OutgoingTransferSupportV1 {
    using SafeERC20 for IERC20;

    IWETH immutable weth;

    constructor(address _wethAddress) {
        weth = IWETH(_wethAddress);
    }

    /// @notice Handle an outgoing funds transfer
    /// @dev Wraps ETH in WETH if the receiver cannot receive ETH, noop if the funds to be sent are 0 or recipient is invalid
    /// @param _dest The destination for the funds
    /// @param _amount The amount to be sent
    /// @param _currency The currency to send funds in, or address(0) for ETH
    /// @param _gasLimit The gas limit to use when attempting a payment (if 0, gasleft() is used)
    function _handleOutgoingTransfer(address _dest, uint256 _amount, address _currency, uint256 _gasLimit) internal {
        if (_amount == 0 || _dest == address(0)) {
            return;
        }

        // Handle ETH payment
        if (_currency == address(0)) {
            require(address(this).balance >= _amount, "_handleOutgoingTransfer insolvent");

            // If no gas limit was provided or provided gas limit greater than gas left, just use the remaining gas.
            uint256 gas = (_gasLimit == 0 || _gasLimit > gasleft()) ? gasleft() : _gasLimit;
            (bool success, ) = _dest.call{value: _amount, gas: gas}("");
            // If the ETH transfer fails (sigh), wrap the ETH and try send it as WETH.
            if (!success) {
                weth.deposit{value: _amount}();
                IERC20(address(weth)).safeTransfer(_dest, _amount);
            }
        } else {
            IERC20(_currency).safeTransfer(_dest, _amount);
        }
    }
}

// File: contracts/market/lib/transferHelpers/BaseTransferHelper.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

import {ModuleManager} from "../../ModuleManager.sol";
import "../../../libs/@openzeppelin/contracts/utils/Context.sol";

contract BaseTransferHelper is Context {
    /// @notice The Module Manager
    ModuleManager public immutable MM;

    /// @param _moduleManager The Module Manager to check permissions
    constructor(address _moduleManager) {
        require(_moduleManager != address(0), "must set module manager to non-zero address");

        MM = ModuleManager(_moduleManager);
    }

    /// @notice Ensures the module is regisered.
    modifier onlyRegisteredModule() {
        require(isModuleRegistered(), "module has not been registered");
        _;
    }

    /// @notice Return if the msgSender() module is registered in ModuleManager
    function isModuleRegistered() public view returns (bool) {
        return MM.isModuleRegistered(_msgSender());
    }
}

// File: contracts/market/lib/transferHelpers/ERC20TransferHelper.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

import {IERC20} from "../../../libs/@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {SafeERC20} from "../../../libs/@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {BaseTransferHelper} from "./BaseTransferHelper.sol";

contract ERC20TransferHelper is BaseTransferHelper {
    using SafeERC20 for IERC20;

    constructor(address _moduleManager) BaseTransferHelper(_moduleManager) {}

    function safeTransferFrom(address _token, address _from, address _to, uint256 _value) public onlyRegisteredModule {
        IERC20(_token).safeTransferFrom(_from, _to, _value);
    }
}

// File: contracts/market/lib/transferHelpers/ERC721TransferHelper.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

import {IERC721} from "../../../libs/@openzeppelin/contracts/token/ERC721/IERC721.sol";
import {BaseTransferHelper} from "./BaseTransferHelper.sol";

contract ERC721TransferHelper is BaseTransferHelper {
    constructor(address _moduleManager) BaseTransferHelper(_moduleManager) {}

    function safeTransferFrom(
        address _token,
        address _from,
        address _to,
        uint256 _tokenId
    ) public onlyRegisteredModule {
        IERC721(_token).safeTransferFrom(_from, _to, _tokenId);
    }

    function transferFrom(address _token, address _from, address _to, uint256 _tokenId) public onlyRegisteredModule {
        IERC721(_token).transferFrom(_from, _to, _tokenId);
    }
}

// File: contracts/market/lib/UniversalExchangeEventV1.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

contract UniversalExchangeEventV1 {
    /// @notice The metadata of a token exchange
    /// @param tokenContract The address of the token contract
    /// @param tokenId The id of the token
    /// @param amount The number of tokens sent
    struct ExchangeDetails {
        address tokenContract;
        uint256 tokenId;
        uint256 amount;
    }

    /// @notice Emitted when a token exchange is executed
    /// @param userA The address of user A
    /// @param userB The address of a user B
    /// @param a The metadata of user A's exchange
    /// @param b The metadata of user B's exchange
    event ExchangeExecuted(address indexed userA, address indexed userB, ExchangeDetails a, ExchangeDetails b);
}

// File: contracts/market/ModuleManager.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

import "../libs/@openzeppelin/contracts/access/Ownable.sol";

/// @title ModuleManager
/// @notice It manages the contracts which can call ERC721TransferHelper, ERC20TransferHelper.
///         For now, it only has AsksV1, but other contracts, e.g. Bids, Auctions, may be added later.
contract ModuleManager is Ownable {
    /// @notice Mapping of modules to registered status
    /// @dev Module address => Registered
    mapping(address => bool) public moduleRegistered;

    /// @notice Emitted when a module registration is changed
    /// @param module The address of the module
    /// @param registered The updated registration
    event ModuleRegistrationChanged(address indexed module, bool registered);

    /// @notice Registers a module
    /// @param _module The address of the module
    function setModuleRegistration(address _module, bool _registered) public onlyOwner {
        moduleRegistered[_module] = _registered;
        emit ModuleRegistrationChanged(_module, _registered);
    }

    /// @notice Return whether the contract is registered
    /// @param _module The address of the module
    function isModuleRegistered(address _module) external view returns (bool) {
        return moduleRegistered[_module];
    }
}