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/*
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                    .--::.            .+ossso+/////++/:://-`   .////+shhhhhhhhhhhhhhhhhhhhhy
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                .--------:::-`     :+:.`  .-/osyyyyyyso++syhyo.-////+shhhhhhhhhhhhhhhhhhhhhy
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       `.-------------------::/:::::..+o+////+oosssyyyyyyys+`  .////+shhhhhhhhhhhhhhhhhhhhhy
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     .-------   ``````.......--`        `-/+ooooosso+/-`          `./++++///:::--...``hhhhyo
                                              `````
   *　
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*/

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

import "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";

import "./mixins/shared/Constants.sol";
import "./mixins/shared/FETHNode.sol";
import "./mixins/shared/FoundationTreasuryNode.sol";
import "./mixins/shared/MarketFees.sol";
import "./mixins/shared/MarketSharedCore.sol";
import "./mixins/shared/RouterContext.sol";
import "./mixins/shared/SendValueWithFallbackWithdraw.sol";

import "./mixins/nftMarket/NFTMarketAuction.sol";
import "./mixins/nftMarket/NFTMarketBuyPrice.sol";
import "./mixins/nftMarket/NFTMarketCore.sol";
import "./mixins/nftMarket/NFTMarketOffer.sol";
import "./mixins/nftMarket/NFTMarketPrivateSaleGap.sol";
import "./mixins/nftMarket/NFTMarketReserveAuction.sol";
import "./mixins/nftMarket/NFTMarketExhibition.sol";

/**
 * @title A market for NFTs on Foundation.
 * @notice The Foundation marketplace is a contract which allows traders to buy and sell NFTs.
 * It supports buying and selling via auctions, private sales, buy price, and offers.
 * @dev All sales in the Foundation market will pay the creator 10% royalties on secondary sales. This is not specific
 * to NFTs minted on Foundation, it should work for any NFT. If royalty information was not defined when the NFT was
 * originally deployed, it may be added using the [Royalty Registry](https://royaltyregistry.xyz/) which will be
 * respected by our market contract.
 * @author batu-inal & HardlyDifficult
 */
contract NFTMarket is
  Initializable,
  FoundationTreasuryNode,
  ContextUpgradeable,
  RouterContext,
  FETHNode,
  MarketSharedCore,
  NFTMarketCore,
  ReentrancyGuardUpgradeable,
  SendValueWithFallbackWithdraw,
  MarketFees,
  NFTMarketExhibition,
  NFTMarketAuction,
  NFTMarketReserveAuction,
  NFTMarketPrivateSaleGap,
  NFTMarketBuyPrice,
  NFTMarketOffer
{
  /**
   * @notice Set immutable variables for the implementation contract.
   * @dev Using immutable instead of constants allows us to use different values on testnet.
   * @param treasury The Foundation Treasury contract address.
   * @param feth The FETH ERC-20 token contract address.
   * @param royaltyRegistry The Royalty Registry contract address.
   * @param duration The duration of the auction in seconds.
   */
  constructor(
    address payable treasury,
    address feth,
    address royaltyRegistry,
    uint256 duration,
    address router
  )
    FoundationTreasuryNode(treasury)
    FETHNode(feth)
    MarketFees(
      /* protocolFeeInBasisPoints: */
      500,
      royaltyRegistry,
      /* assumePrimarySale: */
      false
    )
    NFTMarketReserveAuction(duration)
    RouterContext(router)
  {
    _disableInitializers();
  }

  /**
   * @notice Called once to configure the contract after the initial proxy deployment.
   * @dev This farms the initialize call out to inherited contracts as needed to initialize mutable variables.
   */
  function initialize() external initializer {
    NFTMarketAuction._initializeNFTMarketAuction();
  }

  /**
   * @inheritdoc NFTMarketCore
   */
  function _beforeAuctionStarted(
    address nftContract,
    uint256 tokenId
  ) internal override(NFTMarketCore, NFTMarketBuyPrice, NFTMarketOffer) {
    // This is a no-op function required to avoid compile errors.
    super._beforeAuctionStarted(nftContract, tokenId);
  }

  /**
   * @inheritdoc NFTMarketCore
   */
  function _transferFromEscrow(
    address nftContract,
    uint256 tokenId,
    address recipient,
    address authorizeSeller
  ) internal override(NFTMarketCore, NFTMarketReserveAuction, NFTMarketBuyPrice) {
    // This is a no-op function required to avoid compile errors.
    super._transferFromEscrow(nftContract, tokenId, recipient, authorizeSeller);
  }

  /**
   * @inheritdoc NFTMarketCore
   */
  function _transferFromEscrowIfAvailable(
    address nftContract,
    uint256 tokenId,
    address recipient
  ) internal override(NFTMarketCore, NFTMarketReserveAuction, NFTMarketBuyPrice) {
    // This is a no-op function required to avoid compile errors.
    super._transferFromEscrowIfAvailable(nftContract, tokenId, recipient);
  }

  /**
   * @inheritdoc NFTMarketCore
   */
  function _transferToEscrow(
    address nftContract,
    uint256 tokenId
  ) internal override(NFTMarketCore, NFTMarketReserveAuction, NFTMarketBuyPrice) {
    // This is a no-op function required to avoid compile errors.
    super._transferToEscrow(nftContract, tokenId);
  }

  /**
   * @inheritdoc MarketSharedCore
   */
  function _getSellerOf(
    address nftContract,
    uint256 tokenId
  )
    internal
    view
    override(MarketSharedCore, NFTMarketReserveAuction, NFTMarketBuyPrice)
    returns (address payable seller)
  {
    // This is a no-op function required to avoid compile errors.
    seller = super._getSellerOf(nftContract, tokenId);
  }

  /**
   * @inheritdoc RouterContext
   */
  function _msgSender() internal view override(ContextUpgradeable, RouterContext) returns (address sender) {
    sender = super._msgSender();
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/// @author: manifold.xyz

import "@openzeppelin/contracts/utils/introspection/IERC165.sol";

/**
 * @dev Royalty registry interface
 */
interface IRoyaltyRegistry is IERC165 {
    event RoyaltyOverride(address owner, address tokenAddress, address royaltyAddress);

    /**
     * Override the location of where to look up royalty information for a given token contract.
     * Allows for backwards compatibility and implementation of royalty logic for contracts that did not previously support them.
     *
     * @param tokenAddress    - The token address you wish to override
     * @param royaltyAddress  - The royalty override address
     */
    function setRoyaltyLookupAddress(address tokenAddress, address royaltyAddress) external returns (bool);

    /**
     * Returns royalty address location.  Returns the tokenAddress by default, or the override if it exists
     *
     * @param tokenAddress    - The token address you are looking up the royalty for
     */
    function getRoyaltyLookupAddress(address tokenAddress) external view returns (address);

    /**
     * Returns the token address that an overrideAddress is set for.
     * Note: will not be accurate if the override was created before this function was added.
     *
     * @param overrideAddress - The override address you are looking up the token for
     */
    function getOverrideLookupTokenAddress(address overrideAddress) external view returns (address);

    /**
     * Whether or not the message sender can override the royalty address for the given token address
     *
     * @param tokenAddress    - The token address you are looking up the royalty for
     */
    function overrideAllowed(address tokenAddress) external view returns (bool);
}

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

pragma solidity ^0.8.2;

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

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

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

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

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

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

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

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

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

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

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

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

/**
 * @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 ReentrancyGuardUpgradeable is Initializable {
    // 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;

    function __ReentrancyGuard_init() internal onlyInitializing {
        __ReentrancyGuard_init_unchained();
    }

    function __ReentrancyGuard_init_unchained() internal onlyInitializing {
        _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() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

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

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }

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

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

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/introspection/ERC165Checker.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Library used to query support of an interface declared via {IERC165}.
 *
 * Note that these functions return the actual result of the query: they do not
 * `revert` if an interface is not supported. It is up to the caller to decide
 * what to do in these cases.
 */
library ERC165Checker {
    // As per the EIP-165 spec, no interface should ever match 0xffffffff
    bytes4 private constant _INTERFACE_ID_INVALID = 0xffffffff;

    /**
     * @dev Returns true if `account` supports the {IERC165} interface.
     */
    function supportsERC165(address account) internal view returns (bool) {
        // Any contract that implements ERC165 must explicitly indicate support of
        // InterfaceId_ERC165 and explicitly indicate non-support of InterfaceId_Invalid
        return
            supportsERC165InterfaceUnchecked(account, type(IERC165).interfaceId) &&
            !supportsERC165InterfaceUnchecked(account, _INTERFACE_ID_INVALID);
    }

    /**
     * @dev Returns true if `account` supports the interface defined by
     * `interfaceId`. Support for {IERC165} itself is queried automatically.
     *
     * See {IERC165-supportsInterface}.
     */
    function supportsInterface(address account, bytes4 interfaceId) internal view returns (bool) {
        // query support of both ERC165 as per the spec and support of _interfaceId
        return supportsERC165(account) && supportsERC165InterfaceUnchecked(account, interfaceId);
    }

    /**
     * @dev Returns a boolean array where each value corresponds to the
     * interfaces passed in and whether they're supported or not. This allows
     * you to batch check interfaces for a contract where your expectation
     * is that some interfaces may not be supported.
     *
     * See {IERC165-supportsInterface}.
     *
     * _Available since v3.4._
     */
    function getSupportedInterfaces(
        address account,
        bytes4[] memory interfaceIds
    ) internal view returns (bool[] memory) {
        // an array of booleans corresponding to interfaceIds and whether they're supported or not
        bool[] memory interfaceIdsSupported = new bool[](interfaceIds.length);

        // query support of ERC165 itself
        if (supportsERC165(account)) {
            // query support of each interface in interfaceIds
            for (uint256 i = 0; i < interfaceIds.length; i++) {
                interfaceIdsSupported[i] = supportsERC165InterfaceUnchecked(account, interfaceIds[i]);
            }
        }

        return interfaceIdsSupported;
    }

    /**
     * @dev Returns true if `account` supports all the interfaces defined in
     * `interfaceIds`. Support for {IERC165} itself is queried automatically.
     *
     * Batch-querying can lead to gas savings by skipping repeated checks for
     * {IERC165} support.
     *
     * See {IERC165-supportsInterface}.
     */
    function supportsAllInterfaces(address account, bytes4[] memory interfaceIds) internal view returns (bool) {
        // query support of ERC165 itself
        if (!supportsERC165(account)) {
            return false;
        }

        // query support of each interface in interfaceIds
        for (uint256 i = 0; i < interfaceIds.length; i++) {
            if (!supportsERC165InterfaceUnchecked(account, interfaceIds[i])) {
                return false;
            }
        }

        // all interfaces supported
        return true;
    }

    /**
     * @notice Query if a contract implements an interface, does not check ERC165 support
     * @param account The address of the contract to query for support of an interface
     * @param interfaceId The interface identifier, as specified in ERC-165
     * @return true if the contract at account indicates support of the interface with
     * identifier interfaceId, false otherwise
     * @dev Assumes that account contains a contract that supports ERC165, otherwise
     * the behavior of this method is undefined. This precondition can be checked
     * with {supportsERC165}.
     *
     * Some precompiled contracts will falsely indicate support for a given interface, so caution
     * should be exercised when using this function.
     *
     * Interface identification is specified in ERC-165.
     */
    function supportsERC165InterfaceUnchecked(address account, bytes4 interfaceId) internal view returns (bool) {
        // prepare call
        bytes memory encodedParams = abi.encodeWithSelector(IERC165.supportsInterface.selector, interfaceId);

        // perform static call
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly {
            success := staticcall(30000, account, add(encodedParams, 0x20), mload(encodedParams), 0x00, 0x20)
            returnSize := returndatasize()
            returnValue := mload(0x00)
        }

        return success && returnSize >= 0x20 && returnValue > 0;
    }
}

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

pragma solidity ^0.8.0;

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

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

/**
 * @notice Interface for functions the market uses in FETH.
 * @author batu-inal & HardlyDifficult
 */
interface IFethMarket {
  function depositFor(address account) external payable;

  function marketLockupFor(address account, uint256 amount) external payable returns (uint256 expiration);

  function marketWithdrawFrom(address from, uint256 amount) external;

  function marketWithdrawLocked(address account, uint256 expiration, uint256 amount) external;

  function marketUnlockFor(address account, uint256 expiration, uint256 amount) external;

  function marketChangeLockup(
    address unlockFrom,
    uint256 unlockExpiration,
    uint256 unlockAmount,
    address lockupFor,
    uint256 lockupAmount
  ) external payable returns (uint256 expiration);
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

/**
 * @title Declares the type of the collection contract.
 * @dev This interface is declared as an ERC-165 interface.
 * @author reggieag
 */
interface INFTCollectionType {
  function getNFTCollectionType() external view returns (string memory collectionType);
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

/**
 * @notice The required interface for collections in the NFTDropMarket to support exhibitions.
 * @author philbirt
 */
interface INFTMarketExhibition {
  function isAllowedSellerForExhibition(
    uint256 exhibitionId,
    address seller
  ) external view returns (bool allowedSeller);

  function getExhibitionPaymentDetails(
    uint256 exhibitionId
  ) external view returns (address payable curator, uint16 takeRateInBasisPoints);
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

/**
 * @notice Interface for AdminRole which wraps the default admin role from
 * OpenZeppelin's AccessControl for easy integration.
 * @author batu-inal & HardlyDifficult
 */
interface IAdminRole {
  function isAdmin(address account) external view returns (bool);
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

/**
 * @notice Interface for OperatorRole which wraps a role from
 * OpenZeppelin's AccessControl for easy integration.
 * @author batu-inal & HardlyDifficult
 */
interface IOperatorRole {
  function isOperator(address account) external view returns (bool);
}

// SPDX-License-Identifier: MIT OR Apache-2.0
pragma solidity ^0.8.18;

/**
 * @title Interface for routing calls to the NFT Market to set buy now prices.
 * @author HardlyDifficult
 */
interface INFTMarketBuyNow {
  function setBuyPrice(address nftContract, uint256 tokenId, uint256 price) external;
}

// SPDX-License-Identifier: MIT OR Apache-2.0
pragma solidity ^0.8.18;

/**
 * @title Interface for routing calls to the NFT Market to create reserve auctions.
 * @author HardlyDifficult & reggieag
 */
interface INFTMarketReserveAuction {
  function createReserveAuctionV3(
    address nftContract,
    uint256 tokenId,
    uint256 exhibitionId,
    uint256 reservePrice,
    uint256 duration
  ) external returns (uint256 auctionId);
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

/**
 * @notice An interface for communicating fees to 3rd party marketplaces.
 * @dev Originally implemented in mainnet contract 0x44d6e8933f8271abcf253c72f9ed7e0e4c0323b3
 */
interface IGetFees {
  /**
   * @notice Get the recipient addresses to which creator royalties should be sent.
   * @dev The expected royalty amounts are communicated with `getFeeBps`.
   * @param tokenId The ID of the NFT to get royalties for.
   * @return recipients An array of addresses to which royalties should be sent.
   */
  function getFeeRecipients(uint256 tokenId) external view returns (address payable[] memory recipients);

  /**
   * @notice Get the creator royalty amounts to be sent to each recipient, in basis points.
   * @dev The expected recipients are communicated with `getFeeRecipients`.
   * @param tokenId The ID of the NFT to get royalties for.
   * @return royaltiesInBasisPoints The array of fees to be sent to each recipient, in basis points.
   */
  function getFeeBps(uint256 tokenId) external view returns (uint256[] memory royaltiesInBasisPoints);
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

interface IGetRoyalties {
  /**
   * @notice Get the creator royalties to be sent.
   * @dev The data is the same as when calling `getFeeRecipients` and `getFeeBps` separately.
   * @param tokenId The ID of the NFT to get royalties for.
   * @return recipients An array of addresses to which royalties should be sent.
   * @return royaltiesInBasisPoints The array of fees to be sent to each recipient, in basis points.
   */
  function getRoyalties(
    uint256 tokenId
  ) external view returns (address payable[] memory recipients, uint256[] memory royaltiesInBasisPoints);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.18;

interface IOwnable {
  /**
   * @dev Returns the address of the current owner.
   */
  function owner() external view returns (address);
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

/**
 * @notice Interface for EIP-2981: NFT Royalty Standard.
 * For more see: https://eips.ethereum.org/EIPS/eip-2981.
 */
interface IRoyaltyInfo {
  /**
   * @notice Get the creator royalties to be sent.
   * @param tokenId The ID of the NFT to get royalties for.
   * @param salePrice The total price of the sale.
   * @return receiver The address to which royalties should be sent.
   * @return royaltyAmount The total amount that should be sent to the `receiver`.
   */
  function royaltyInfo(
    uint256 tokenId,
    uint256 salePrice
  ) external view returns (address receiver, uint256 royaltyAmount);
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

interface ITokenCreator {
  /**
   * @notice Returns the creator of this NFT collection.
   * @param tokenId The ID of the NFT to get the creator payment address for.
   * @return creator The creator of this collection.
   */
  function tokenCreator(uint256 tokenId) external view returns (address payable creator);
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

/**
 * @title Helper functions for arrays.
 * @author batu-inal & HardlyDifficult
 */
library ArrayLibrary {
  /**
   * @notice Reduces the size of an array if it's greater than the specified max size,
   * using the first maxSize elements.
   */
  function capLength(address payable[] memory data, uint256 maxLength) internal pure {
    if (data.length > maxLength) {
      assembly {
        mstore(data, maxLength)
      }
    }
  }

  /**
   * @notice Reduces the size of an array if it's greater than the specified max size,
   * using the first maxSize elements.
   */
  function capLength(uint256[] memory data, uint256 maxLength) internal pure {
    if (data.length > maxLength) {
      assembly {
        mstore(data, maxLength)
      }
    }
  }
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

/**
 * @title Helpers for working with time.
 * @author batu-inal & HardlyDifficult
 */
library TimeLibrary {
  /**
   * @notice Checks if the given timestamp is in the past.
   * @dev This helper ensures a consistent interpretation of expiry across the codebase.
   * This is different than `hasBeenReached` in that it will return false if the expiry is now.
   */
  function hasExpired(uint256 expiry) internal view returns (bool) {
    return expiry < block.timestamp;
  }

  /**
   * @notice Checks if the given timestamp is now or in the past.
   * @dev This helper ensures a consistent interpretation of expiry across the codebase.
   * This is different from `hasExpired` in that it will return true if the timestamp is now.
   */
  function hasBeenReached(uint256 timestamp) internal view returns (bool) {
    return timestamp <= block.timestamp;
  }
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

/**
 * @title An abstraction layer for auctions.
 * @dev This contract can be expanded with reusable calls and data as more auction types are added.
 * @author batu-inal & HardlyDifficult
 */
abstract contract NFTMarketAuction {
  /**
   * @notice A global id for auctions of any type.
   */
  uint256 private nextAuctionId;

  /**
   * @notice Called once to configure the contract after the initial proxy deployment.
   * @dev This sets the initial auction id to 1, making the first auction cheaper
   * and id 0 represents no auction found.
   */
  function _initializeNFTMarketAuction() internal {
    nextAuctionId = 1;
  }

  /**
   * @notice Returns id to assign to the next auction.
   */
  function _getNextAndIncrementAuctionId() internal returns (uint256) {
    // AuctionId cannot overflow 256 bits.
    unchecked {
      return nextAuctionId++;
    }
  }

  /**
   * @notice This empty reserved space is put in place to allow future versions to add new
   * variables without shifting down storage in the inheritance chain.
   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
   */
  uint256[1_000] private __gap;
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

import "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";

import "../../interfaces/internal/routes/INFTMarketBuyNow.sol";

import "../shared/MarketFees.sol";
import "../shared/FoundationTreasuryNode.sol";
import "../shared/FETHNode.sol";
import "../shared/MarketSharedCore.sol";
import "../shared/SendValueWithFallbackWithdraw.sol";

import "./NFTMarketCore.sol";
import "./NFTMarketExhibition.sol";

/// @param buyPrice The current buy price set for this NFT.
error NFTMarketBuyPrice_Cannot_Buy_At_Lower_Price(uint256 buyPrice);
error NFTMarketBuyPrice_Cannot_Buy_Unset_Price();
error NFTMarketBuyPrice_Cannot_Cancel_Unset_Price();
/// @param owner The current owner of this NFT.
error NFTMarketBuyPrice_Only_Owner_Can_Cancel_Price(address owner);
/// @param owner The current owner of this NFT.
error NFTMarketBuyPrice_Only_Owner_Can_Set_Price(address owner);
error NFTMarketBuyPrice_Price_Already_Set();
error NFTMarketBuyPrice_Price_Too_High();
/// @param seller The current owner of this NFT.
error NFTMarketBuyPrice_Seller_Mismatch(address seller);

/**
 * @title Allows sellers to set a buy price of their NFTs that may be accepted and instantly transferred to the buyer.
 * @notice NFTs with a buy price set are escrowed in the market contract.
 * @author batu-inal & HardlyDifficult
 */
abstract contract NFTMarketBuyPrice is
  INFTMarketBuyNow,
  FoundationTreasuryNode,
  ContextUpgradeable,
  FETHNode,
  MarketSharedCore,
  NFTMarketCore,
  ReentrancyGuardUpgradeable,
  SendValueWithFallbackWithdraw,
  MarketFees,
  NFTMarketExhibition
{
  using AddressUpgradeable for address payable;

  /// @notice Stores the buy price details for a specific NFT.
  /// @dev The struct is packed into a single slot to optimize gas.
  struct BuyPrice {
    /// @notice The current owner of this NFT which set a buy price.
    /// @dev A zero price is acceptable so a non-zero address determines whether a price has been set.
    address payable seller;
    /// @notice The current buy price set for this NFT.
    uint96 price;
  }

  /// @notice Stores the current buy price for each NFT.
  mapping(address => mapping(uint256 => BuyPrice)) private nftContractToTokenIdToBuyPrice;

  /**
   * @notice Emitted when an NFT is bought by accepting the buy price,
   * indicating that the NFT has been transferred and revenue from the sale distributed.
   * @dev The total buy price that was accepted is `totalFees` + `creatorRev` + `sellerRev`.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @param buyer The address of the collector that purchased the NFT using `buy`.
   * @param seller The address of the seller which originally set the buy price.
   * @param totalFees The amount of ETH that was sent to Foundation & referrals for this sale.
   * @param creatorRev The amount of ETH that was sent to the creator for this sale.
   * @param sellerRev The amount of ETH that was sent to the owner for this sale.
   */
  event BuyPriceAccepted(
    address indexed nftContract,
    uint256 indexed tokenId,
    address indexed seller,
    address buyer,
    uint256 totalFees,
    uint256 creatorRev,
    uint256 sellerRev
  );
  /**
   * @notice Emitted when the buy price is removed by the owner of an NFT.
   * @dev The NFT is transferred back to the owner unless it's still escrowed for another market tool,
   * e.g. listed for sale in an auction.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   */
  event BuyPriceCanceled(address indexed nftContract, uint256 indexed tokenId);
  /**
   * @notice Emitted when a buy price is invalidated due to other market activity.
   * @dev This occurs when the buy price is no longer eligible to be accepted,
   * e.g. when a bid is placed in an auction for this NFT.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   */
  event BuyPriceInvalidated(address indexed nftContract, uint256 indexed tokenId);
  /**
   * @notice Emitted when a buy price is set by the owner of an NFT.
   * @dev The NFT is transferred into the market contract for escrow unless it was already escrowed,
   * e.g. for auction listing.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @param seller The address of the NFT owner which set the buy price.
   * @param price The price of the NFT.
   */
  event BuyPriceSet(address indexed nftContract, uint256 indexed tokenId, address indexed seller, uint256 price);

  /**
   * @notice [DEPRECATED] use `buyV2` instead.
   * Buy the NFT at the set buy price.
   * `msg.value` must be <= `maxPrice` and any delta will be taken from the account's available FETH balance.
   * @dev `maxPrice` protects the buyer in case a the price is increased but allows the transaction to continue
   * when the price is reduced (and any surplus funds provided are refunded).
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @param maxPrice The maximum price to pay for the NFT.
   */
  function buy(address nftContract, uint256 tokenId, uint256 maxPrice) external payable {
    buyV2(nftContract, tokenId, maxPrice, payable(0));
  }

  /**
   * @notice Buy the NFT at the set buy price.
   * `msg.value` must be <= `maxPrice` and any delta will be taken from the account's available FETH balance.
   * @dev `maxPrice` protects the buyer in case a the price is increased but allows the transaction to continue
   * when the price is reduced (and any surplus funds provided are refunded).
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @param maxPrice The maximum price to pay for the NFT.
   * @param referrer The address of the referrer.
   */
  function buyV2(address nftContract, uint256 tokenId, uint256 maxPrice, address payable referrer) public payable {
    BuyPrice storage buyPrice = nftContractToTokenIdToBuyPrice[nftContract][tokenId];
    if (buyPrice.price > maxPrice) {
      revert NFTMarketBuyPrice_Cannot_Buy_At_Lower_Price(buyPrice.price);
    } else if (buyPrice.seller == address(0)) {
      revert NFTMarketBuyPrice_Cannot_Buy_Unset_Price();
    }

    _buy(nftContract, tokenId, referrer);
  }

  /**
   * @notice Removes the buy price set for an NFT.
   * @dev The NFT is transferred back to the owner unless it's still escrowed for another market tool,
   * e.g. listed for sale in an auction.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   */
  function cancelBuyPrice(address nftContract, uint256 tokenId) external nonReentrant {
    address seller = nftContractToTokenIdToBuyPrice[nftContract][tokenId].seller;
    address sender = _msgSender();
    if (seller == address(0)) {
      // This check is redundant with the next one, but done in order to provide a more clear error message.
      revert NFTMarketBuyPrice_Cannot_Cancel_Unset_Price();
    } else if (seller != sender) {
      revert NFTMarketBuyPrice_Only_Owner_Can_Cancel_Price(seller);
    }

    // Remove the buy price
    delete nftContractToTokenIdToBuyPrice[nftContract][tokenId];

    // Transfer the NFT back to the owner if it is not listed in auction.
    _transferFromEscrowIfAvailable(nftContract, tokenId, sender);

    emit BuyPriceCanceled(nftContract, tokenId);
  }

  /**
   * @notice Sets the buy price for an NFT and escrows it in the market contract.
   * A 0 price is acceptable and valid price you can set, enabling a giveaway to the first collector that calls `buy`.
   * @dev If there is an offer for this amount or higher, that will be accepted instead of setting a buy price.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @param price The price at which someone could buy this NFT.
   */
  function setBuyPrice(address nftContract, uint256 tokenId, uint256 price) external nonReentrant {
    // If there is a valid offer at this price or higher, accept that instead.
    if (_autoAcceptOffer(nftContract, tokenId, price)) {
      return;
    }

    if (price > type(uint96).max) {
      // This ensures that no data is lost when storing the price as `uint96`.
      revert NFTMarketBuyPrice_Price_Too_High();
    }

    BuyPrice storage buyPrice = nftContractToTokenIdToBuyPrice[nftContract][tokenId];
    address seller = buyPrice.seller;

    if (buyPrice.price == price && seller != address(0)) {
      revert NFTMarketBuyPrice_Price_Already_Set();
    }

    // Store the new price for this NFT.
    buyPrice.price = uint96(price);

    address payable sender = payable(_msgSender());

    if (seller == address(0)) {
      // Transfer the NFT into escrow, if it's already in escrow confirm the `msg.sender` is the owner.
      _transferToEscrow(nftContract, tokenId);

      // The price was not previously set for this NFT, store the seller.
      buyPrice.seller = sender;
    } else if (seller != sender) {
      // Buy price was previously set by a different user
      revert NFTMarketBuyPrice_Only_Owner_Can_Set_Price(seller);
    }

    emit BuyPriceSet(nftContract, tokenId, sender, price);
  }

  /**
   * @notice If there is a buy price at this price or lower, accept that and return true.
   */
  function _autoAcceptBuyPrice(
    address nftContract,
    uint256 tokenId,
    uint256 maxPrice
  ) internal override returns (bool) {
    BuyPrice storage buyPrice = nftContractToTokenIdToBuyPrice[nftContract][tokenId];
    if (buyPrice.seller == address(0) || buyPrice.price > maxPrice) {
      // No buy price was found, or the price is too high.
      return false;
    }

    _buy(nftContract, tokenId, payable(0));
    return true;
  }

  /**
   * @inheritdoc NFTMarketCore
   * @dev Invalidates the buy price on a auction start, if one is found.
   */
  function _beforeAuctionStarted(address nftContract, uint256 tokenId) internal virtual override {
    BuyPrice storage buyPrice = nftContractToTokenIdToBuyPrice[nftContract][tokenId];
    if (buyPrice.seller != address(0)) {
      // A buy price was set for this NFT, invalidate it.
      _invalidateBuyPrice(nftContract, tokenId);
    }
    super._beforeAuctionStarted(nftContract, tokenId);
  }

  /**
   * @notice Process the purchase of an NFT at the current buy price.
   * @dev The caller must confirm that the seller != address(0) before calling this function.
   */
  function _buy(address nftContract, uint256 tokenId, address payable referrer) private nonReentrant {
    BuyPrice memory buyPrice = nftContractToTokenIdToBuyPrice[nftContract][tokenId];

    // Remove the buy now price
    delete nftContractToTokenIdToBuyPrice[nftContract][tokenId];

    // Cancel the buyer's offer if there is one in order to free up their FETH balance
    // even if they don't need the FETH for this specific purchase.
    _cancelSendersOffer(nftContract, tokenId);

    _tryUseFETHBalance(buyPrice.price, true);

    address sender = _msgSender();

    (
      address payable sellerReferrerPaymentAddress,
      uint16 sellerReferrerTakeRateInBasisPoints
    ) = _getExhibitionForPayment(nftContract, tokenId);

    // Transfer the NFT to the buyer.
    // The seller was already authorized when the buyPrice was set originally set.
    _transferFromEscrow(nftContract, tokenId, sender, address(0));

    // Distribute revenue for this sale.
    (uint256 totalFees, uint256 creatorRev, uint256 sellerRev) = _distributeFunds(
      nftContract,
      tokenId,
      buyPrice.seller,
      buyPrice.price,
      referrer,
      sellerReferrerPaymentAddress,
      sellerReferrerTakeRateInBasisPoints
    );

    emit BuyPriceAccepted(nftContract, tokenId, buyPrice.seller, sender, totalFees, creatorRev, sellerRev);
  }

  /**
   * @notice Clear a buy price and emit BuyPriceInvalidated.
   * @dev The caller must confirm the buy price is set before calling this function.
   */
  function _invalidateBuyPrice(address nftContract, uint256 tokenId) private {
    delete nftContractToTokenIdToBuyPrice[nftContract][tokenId];
    emit BuyPriceInvalidated(nftContract, tokenId);
  }

  /**
   * @inheritdoc NFTMarketCore
   * @dev Invalidates the buy price if one is found before transferring the NFT.
   * This will revert if there is a buy price set but the `authorizeSeller` is not the owner.
   */
  function _transferFromEscrow(
    address nftContract,
    uint256 tokenId,
    address recipient,
    address authorizeSeller
  ) internal virtual override {
    address seller = nftContractToTokenIdToBuyPrice[nftContract][tokenId].seller;
    if (seller != address(0)) {
      // A buy price was set for this NFT.
      // `authorizeSeller != address(0) &&` could be added when other mixins use this flow.
      // ATM that additional check would never return false.
      if (seller != authorizeSeller) {
        // When there is a buy price set, the `buyPrice.seller` is the owner of the NFT.
        revert NFTMarketBuyPrice_Seller_Mismatch(seller);
      }
      // The seller authorization has been confirmed.
      authorizeSeller = address(0);

      // Invalidate the buy price as the NFT will no longer be in escrow.
      _invalidateBuyPrice(nftContract, tokenId);
    }

    super._transferFromEscrow(nftContract, tokenId, recipient, authorizeSeller);
  }

  /**
   * @inheritdoc NFTMarketCore
   * @dev Checks if there is a buy price set, if not then allow the transfer to proceed.
   */
  function _transferFromEscrowIfAvailable(
    address nftContract,
    uint256 tokenId,
    address recipient
  ) internal virtual override {
    address seller = nftContractToTokenIdToBuyPrice[nftContract][tokenId].seller;
    if (seller == address(0)) {
      // A buy price has been set for this NFT so it should remain in escrow.
      super._transferFromEscrowIfAvailable(nftContract, tokenId, recipient);
    }
  }

  /**
   * @inheritdoc NFTMarketCore
   * @dev Checks if the NFT is already in escrow for buy now.
   */
  function _transferToEscrow(address nftContract, uint256 tokenId) internal virtual override {
    address seller = nftContractToTokenIdToBuyPrice[nftContract][tokenId].seller;
    if (seller == address(0)) {
      // The NFT is not in escrow for buy now.
      super._transferToEscrow(nftContract, tokenId);
    } else if (seller != _msgSender()) {
      // When there is a buy price set, the `seller` is the owner of the NFT.
      revert NFTMarketBuyPrice_Seller_Mismatch(seller);
    }
  }

  /**
   * @notice Returns the buy price details for an NFT if one is available.
   * @dev If no price is found, seller will be address(0) and price will be max uint256.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @return seller The address of the owner that listed a buy price for this NFT.
   * Returns `address(0)` if there is no buy price set for this NFT.
   * @return price The price of the NFT.
   * Returns max uint256 if there is no buy price set for this NFT (since a price of 0 is supported).
   */
  function getBuyPrice(address nftContract, uint256 tokenId) external view returns (address seller, uint256 price) {
    seller = nftContractToTokenIdToBuyPrice[nftContract][tokenId].seller;
    if (seller == address(0)) {
      return (seller, type(uint256).max);
    }
    price = nftContractToTokenIdToBuyPrice[nftContract][tokenId].price;
  }

  /**
   * @inheritdoc MarketSharedCore
   * @dev Returns the seller if there is a buy price set for this NFT, otherwise
   * bubbles the call up for other considerations.
   */
  function _getSellerOf(
    address nftContract,
    uint256 tokenId
  ) internal view virtual override returns (address payable seller) {
    seller = nftContractToTokenIdToBuyPrice[nftContract][tokenId].seller;
    if (seller == address(0)) {
      seller = super._getSellerOf(nftContract, tokenId);
    }
  }

  /**
   * @notice This empty reserved space is put in place to allow future versions to add new
   * variables without shifting down storage in the inheritance chain.
   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
   */
  uint256[1_000] private __gap;
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol";

import "../../interfaces/internal/IFethMarket.sol";

import "../shared/Constants.sol";
import "../shared/MarketSharedCore.sol";

error NFTMarketCore_Seller_Not_Found();

/**
 * @title A place for common modifiers and functions used by various NFTMarket mixins, if any.
 * @dev This also leaves a gap which can be used to add a new mixin to the top of the inheritance tree.
 * @author batu-inal & HardlyDifficult
 */
abstract contract NFTMarketCore is ContextUpgradeable, MarketSharedCore {
  using AddressUpgradeable for address;
  using AddressUpgradeable for address payable;

  /**
   * @notice If there is a buy price at this amount or lower, accept that and return true.
   */
  function _autoAcceptBuyPrice(address nftContract, uint256 tokenId, uint256 amount) internal virtual returns (bool);

  /**
   * @notice If there is a valid offer at the given price or higher, accept that and return true.
   */
  function _autoAcceptOffer(address nftContract, uint256 tokenId, uint256 minAmount) internal virtual returns (bool);

  /**
   * @notice Notify implementors when an auction has received its first bid.
   * Once a bid is received the sale is guaranteed to the auction winner
   * and other sale mechanisms become unavailable.
   * @dev Implementors of this interface should update internal state to reflect an auction has been kicked off.
   */
  function _beforeAuctionStarted(address /*nftContract*/, uint256 /*tokenId*/) internal virtual {
    // No-op
  }

  /**
   * @notice Cancel the `msg.sender`'s offer if there is one, freeing up their FETH balance.
   * @dev This should be used when it does not make sense to keep the original offer around,
   * e.g. if a collector accepts a Buy Price then keeping the offer around is not necessary.
   */
  function _cancelSendersOffer(address nftContract, uint256 tokenId) internal virtual;

  /**
   * @notice Transfers the NFT from escrow and clears any state tracking this escrowed NFT.
   * @param authorizeSeller The address of the seller pending authorization.
   * Once it's been authorized by one of the escrow managers, it should be set to address(0)
   * indicated that it's no longer pending authorization.
   */
  function _transferFromEscrow(
    address nftContract,
    uint256 tokenId,
    address recipient,
    address authorizeSeller
  ) internal virtual {
    if (authorizeSeller != address(0)) {
      revert NFTMarketCore_Seller_Not_Found();
    }
    IERC721(nftContract).transferFrom(address(this), recipient, tokenId);
  }

  /**
   * @notice Transfers the NFT from escrow unless there is another reason for it to remain in escrow.
   */
  function _transferFromEscrowIfAvailable(address nftContract, uint256 tokenId, address recipient) internal virtual {
    _transferFromEscrow(nftContract, tokenId, recipient, address(0));
  }

  /**
   * @notice Transfers an NFT into escrow,
   * if already there this requires the msg.sender is authorized to manage the sale of this NFT.
   */
  function _transferToEscrow(address nftContract, uint256 tokenId) internal virtual {
    IERC721(nftContract).transferFrom(_msgSender(), address(this), tokenId);
  }

  /**
   * @dev Determines the minimum amount when increasing an existing offer or bid.
   */
  function _getMinIncrement(uint256 currentAmount) internal pure returns (uint256) {
    uint256 minIncrement = currentAmount;
    unchecked {
      minIncrement /= MIN_PERCENT_INCREMENT_DENOMINATOR;
    }
    if (minIncrement == 0) {
      // Since minIncrement reduces from the currentAmount, this cannot overflow.
      // The next amount must be at least 1 wei greater than the current.
      return currentAmount + 1;
    }

    return minIncrement + currentAmount;
  }

  /**
   * @inheritdoc MarketSharedCore
   */
  function _getSellerOrOwnerOf(
    address nftContract,
    uint256 tokenId
  ) internal view override returns (address payable sellerOrOwner) {
    sellerOrOwner = _getSellerOf(nftContract, tokenId);
    if (sellerOrOwner == address(0)) {
      sellerOrOwner = payable(IERC721(nftContract).ownerOf(tokenId));
    }
  }

  /**
   * @notice Checks if an escrowed NFT is currently in active auction.
   * @return Returns false if the auction has ended, even if it has not yet been settled.
   */
  function _isInActiveAuction(address nftContract, uint256 tokenId) internal view virtual returns (bool);

  /**
   * @notice This empty reserved space is put in place to allow future versions to add new
   * variables without shifting down storage in the inheritance chain.
   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
   * @dev 50 slots were consumed by adding `ReentrancyGuard`.
   */
  uint256[450] private __gap;
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

import "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";

import "../../interfaces/internal/INFTMarketExhibition.sol";
import "../shared/Constants.sol";

/// @param curator The curator for this exhibition.
error NFTMarketExhibition_Caller_Is_Not_Curator(address curator);
error NFTMarketExhibition_Can_Not_Add_Dupe_Seller();
error NFTMarketExhibition_Curator_Automatically_Allowed();
error NFTMarketExhibition_Exhibition_Does_Not_Exist();
error NFTMarketExhibition_Seller_Not_Allowed_In_Exhibition();
error NFTMarketExhibition_Sellers_Required();
error NFTMarketExhibition_Take_Rate_Too_High();

/**
 * @title Enables a curation surface for sellers to exhibit their NFTs.
 * @author HardlyDifficult
 */
abstract contract NFTMarketExhibition is INFTMarketExhibition, ContextUpgradeable {
  /**
   * @notice Stores details about an exhibition.
   */
  struct Exhibition {
    /// @notice The curator which created this exhibition.
    address payable curator;
    /// @notice The rate of the sale which goes to the curator.
    uint16 takeRateInBasisPoints;
    // 80-bits available in the first slot

    /// @notice A name for the exhibition.
    string name;
  }

  /// @notice Tracks the next sequence ID to be assigned to an exhibition.
  uint256 private $latestExhibitionId;

  /// @notice Maps the exhibition ID to their details.
  mapping(uint256 => Exhibition) private $idToExhibition;

  /// @notice Maps an exhibition to the list of sellers allowed to list with it.
  mapping(uint256 => mapping(address => bool)) private $exhibitionIdToSellerToIsAllowed;

  /// @notice Maps an NFT to the exhibition it was listed with.
  mapping(address => mapping(uint256 => uint256)) private $nftContractToTokenIdToExhibitionId;

  /**
   * @notice Emitted when an exhibition is created.
   * @param exhibitionId The ID for this exhibition.
   * @param curator The curator which created this exhibition.
   * @param name The name for this exhibition.
   * @param takeRateInBasisPoints The rate of the sale which goes to the curator.
   */
  event ExhibitionCreated(
    uint256 indexed exhibitionId,
    address indexed curator,
    string name,
    uint16 takeRateInBasisPoints
  );

  /**
   * @notice Emitted when an exhibition is deleted.
   * @param exhibitionId The ID for the exhibition.
   */
  event ExhibitionDeleted(uint256 indexed exhibitionId);

  /**
   * @notice Emitted when an NFT is listed in an exhibition.
   * @param nftContract The contract address of the NFT.
   * @param tokenId The ID of the NFT.
   * @param exhibitionId The ID of the exhibition it was listed with.
   */
  event NftAddedToExhibition(address indexed nftContract, uint256 indexed tokenId, uint256 indexed exhibitionId);

  /**
   * @notice Emitted when an NFT is no longer associated with an exhibition for reasons other than a sale.
   * @param nftContract The contract address of the NFT.
   * @param tokenId The ID of the NFT.
   * @param exhibitionId The ID of the exhibition it was originally listed with.
   */
  event NftRemovedFromExhibition(address indexed nftContract, uint256 indexed tokenId, uint256 indexed exhibitionId);

  /**
   * @notice Emitted when sellers are granted access to list with an exhibition.
   * @param exhibitionId The ID of the exhibition.
   * @param sellers The list of sellers granted access.
   */
  event SellersAddedToExhibition(uint256 indexed exhibitionId, address[] sellers);

  /// @notice Requires the caller to be the curator of the exhibition.
  modifier onlyExhibitionCurator(uint256 exhibitionId) {
    address curator = $idToExhibition[exhibitionId].curator;
    if (curator != _msgSender()) {
      if (curator == address(0)) {
        // If the curator is not a match, check if the exhibition exists in order to provide a better error message.
        revert NFTMarketExhibition_Exhibition_Does_Not_Exist();
      }
      revert NFTMarketExhibition_Caller_Is_Not_Curator(curator);
    }
    _;
  }

  /// @notice Requires the caller pass in some number of sellers
  modifier sellersRequired(address[] calldata sellers) {
    if (sellers.length == 0) {
      revert NFTMarketExhibition_Sellers_Required();
    }
    _;
  }

  ////////////////////////////////////////////////////////////////
  // Exhibition Management
  ////////////////////////////////////////////////////////////////

  /**
   * @notice Creates an exhibition.
   * @param name The name for this exhibition.
   * @param takeRateInBasisPoints The rate of the sale which goes to the msg.sender as the curator of this exhibition.
   * @param sellers The list of sellers allowed to list with this exhibition.
   * @dev The list of sellers may be modified after the exhibition is created via addSellersToExhibition,
   *      which only allows for adding (not removing) new sellers.
   */
  function createExhibition(
    string calldata name,
    uint16 takeRateInBasisPoints,
    address[] calldata sellers
  ) external sellersRequired(sellers) returns (uint256 exhibitionId) {
    if (takeRateInBasisPoints > MAX_EXHIBITION_TAKE_RATE) {
      revert NFTMarketExhibition_Take_Rate_Too_High();
    }

    // Create exhibition
    unchecked {
      exhibitionId = ++$latestExhibitionId;
    }
    address payable sender = payable(_msgSender());
    $idToExhibition[exhibitionId] = Exhibition({
      curator: sender,
      takeRateInBasisPoints: takeRateInBasisPoints,
      name: name
    });
    emit ExhibitionCreated({
      exhibitionId: exhibitionId,
      curator: sender,
      name: name,
      takeRateInBasisPoints: takeRateInBasisPoints
    });

    _addSellersToExhibition(exhibitionId, sellers);
  }

  /**
   * @notice Deletes an exhibition created by the msg.sender.
   * @param exhibitionId The ID of the exhibition to delete.
   * @dev Once deleted, any NFTs listed with this exhibition will still be listed but will no longer be associated with
   * or share revenue with the exhibition.
   */
  function deleteExhibition(uint256 exhibitionId) external onlyExhibitionCurator(exhibitionId) {
    delete $idToExhibition[exhibitionId];
    emit ExhibitionDeleted(exhibitionId);
  }

  /**
   * @notice Returns exhibition details for a given ID.
   * @param exhibitionId The ID of the exhibition to look up.
   * @return name The name of the exhibition.
   * @return curator The curator of the exhibition.
   * @return takeRateInBasisPoints The rate of the sale which goes to the curator.
   * @dev If the exhibition does not exist or has since been deleted, the curator will be address(0).
   */
  function getExhibition(
    uint256 exhibitionId
  ) external view returns (string memory name, address payable curator, uint16 takeRateInBasisPoints) {
    Exhibition memory exhibition = $idToExhibition[exhibitionId];
    name = exhibition.name;
    curator = exhibition.curator;
    takeRateInBasisPoints = exhibition.takeRateInBasisPoints;
  }

  ////////////////////////////////////////////////////////////////
  // Allowlist
  ////////////////////////////////////////////////////////////////

  /**
   * @notice Adds sellers to exhibition.
   * @param exhibitionId The exhibition ID.
   * @param sellers The new list of sellers to be allowed to list with this exhibition.
   */
  function addSellersToExhibition(
    uint256 exhibitionId,
    address[] calldata sellers
  ) external onlyExhibitionCurator(exhibitionId) sellersRequired(sellers) {
    _addSellersToExhibition(exhibitionId, sellers);
  }

  function _addSellersToExhibition(uint256 exhibitionId, address[] calldata sellers) private {
    // Populate allow list
    for (uint256 i = 0; i < sellers.length; ) {
      address seller = sellers[i];
      if ($exhibitionIdToSellerToIsAllowed[exhibitionId][seller]) {
        revert NFTMarketExhibition_Can_Not_Add_Dupe_Seller();
      }
      if (seller == _msgSender()) {
        revert NFTMarketExhibition_Curator_Automatically_Allowed();
      }
      $exhibitionIdToSellerToIsAllowed[exhibitionId][seller] = true;
      unchecked {
        ++i;
      }
    }
    emit SellersAddedToExhibition(exhibitionId, sellers);
  }

  /**
   * @notice Checks if a given seller is approved to list with a given exhibition.
   * @param exhibitionId The ID of the exhibition to check.
   * @param seller The address of the seller to check.
   * @return allowedSeller True if the seller is approved to list with the exhibition.
   */
  function isAllowedSellerForExhibition(
    uint256 exhibitionId,
    address seller
  ) external view returns (bool allowedSeller) {
    address curator = $idToExhibition[exhibitionId].curator;
    if (curator != address(0)) {
      allowedSeller = $exhibitionIdToSellerToIsAllowed[exhibitionId][seller] || seller == curator;
    }
  }

  ////////////////////////////////////////////////////////////////
  // Inventory
  ////////////////////////////////////////////////////////////////

  /**
   * @notice Assigns an NFT to an exhibition.
   * @param nftContract The contract address of the NFT.
   * @param tokenId The ID of the NFT.
   * @param exhibitionId The ID of the exhibition to list the NFT with.
   * @dev This call is a no-op if the `exhibitionId` is 0.
   */
  function _addNftToExhibition(address nftContract, uint256 tokenId, uint256 exhibitionId) internal {
    if (exhibitionId != 0) {
      Exhibition storage exhibition = $idToExhibition[exhibitionId];
      if (exhibition.curator == address(0)) {
        revert NFTMarketExhibition_Exhibition_Does_Not_Exist();
      }
      address sender = _msgSender();
      if (!$exhibitionIdToSellerToIsAllowed[exhibitionId][sender] && exhibition.curator != sender) {
        revert NFTMarketExhibition_Seller_Not_Allowed_In_Exhibition();
      }
      $nftContractToTokenIdToExhibitionId[nftContract][tokenId] = exhibitionId;
      emit NftAddedToExhibition(nftContract, tokenId, exhibitionId);
    }
  }

  /**
   * @notice Clears an NFT's association with an exhibition.
   */
  function _removeNftFromExhibition(address nftContract, uint256 tokenId) internal {
    uint256 exhibitionId = $nftContractToTokenIdToExhibitionId[nftContract][tokenId];
    if (exhibitionId != 0) {
      delete $nftContractToTokenIdToExhibitionId[nftContract][tokenId];
      emit NftRemovedFromExhibition(nftContract, tokenId, exhibitionId);
    }
  }

  /**
   * @notice Returns the exhibition ID for a given NFT.
   * @param nftContract The contract address of the NFT.
   * @param tokenId The ID of the NFT.
   * @return exhibitionId The ID of the exhibition this NFT is assigned to, or 0 if it's not assigned to an exhibition.
   */
  function getExhibitionIdForNft(address nftContract, uint256 tokenId) external view returns (uint256 exhibitionId) {
    exhibitionId = $nftContractToTokenIdToExhibitionId[nftContract][tokenId];
  }

  ////////////////////////////////////////////////////////////////
  // Payments
  ////////////////////////////////////////////////////////////////

  /**
   * @notice Returns exhibition details if this NFT was assigned to one, and clears the assignment.
   * @return paymentAddress The address to send the payment to, or address(0) if n/a.
   * @return takeRateInBasisPoints The rate of the sale which goes to the curator, or 0 if n/a.
   * @dev This does not emit NftRemovedFromExhibition, instead it's expected that SellerReferralPaid will be emitted.
   */
  function _getExhibitionForPayment(
    address nftContract,
    uint256 tokenId
  ) internal returns (address payable paymentAddress, uint16 takeRateInBasisPoints) {
    uint256 exhibitionId = $nftContractToTokenIdToExhibitionId[nftContract][tokenId];
    if (exhibitionId != 0) {
      paymentAddress = $idToExhibition[exhibitionId].curator;
      takeRateInBasisPoints = $idToExhibition[exhibitionId].takeRateInBasisPoints;
      delete $nftContractToTokenIdToExhibitionId[nftContract][tokenId];
    }
  }

  /**
   * @notice Returns exhibition payment details for a given ID.
   * @param exhibitionId The ID of the exhibition to look up.
   * @return curator The curator of the exhibition.
   * @return takeRateInBasisPoints The rate of the sale which goes to the curator.
   * @dev If the exhibition does not exist or has since been deleted, the curator will be address(0).
   */
  function getExhibitionPaymentDetails(
    uint256 exhibitionId
  ) external view returns (address payable curator, uint16 takeRateInBasisPoints) {
    Exhibition storage exhibition = $idToExhibition[exhibitionId];
    curator = exhibition.curator;
    takeRateInBasisPoints = exhibition.takeRateInBasisPoints;
  }

  /**
   * @notice This empty reserved space is put in place to allow future versions to add new
   * variables without shifting down storage in the inheritance chain.
   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
   * @dev This file uses a total of 500 slots.
   */
  uint256[496] private __gap;
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

import "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";

import "../../libraries/TimeLibrary.sol";

import "../shared/MarketFees.sol";
import "../shared/FoundationTreasuryNode.sol";
import "../shared/FETHNode.sol";
import "../shared/SendValueWithFallbackWithdraw.sol";

import "./NFTMarketCore.sol";
import "./NFTMarketExhibition.sol";

error NFTMarketOffer_Cannot_Be_Made_While_In_Auction();
/// @param currentOfferAmount The current highest offer available for this NFT.
error NFTMarketOffer_Offer_Below_Min_Amount(uint256 currentOfferAmount);
/// @param expiry The time at which the offer had expired.
error NFTMarketOffer_Offer_Expired(uint256 expiry);
/// @param currentOfferFrom The address of the collector which has made the current highest offer.
error NFTMarketOffer_Offer_From_Does_Not_Match(address currentOfferFrom);
/// @param minOfferAmount The minimum amount that must be offered in order for it to be accepted.
error NFTMarketOffer_Offer_Must_Be_At_Least_Min_Amount(uint256 minOfferAmount);

/**
 * @title Allows collectors to make an offer for an NFT, valid for 24-25 hours.
 * @notice Funds are escrowed in the FETH ERC-20 token contract.
 * @author batu-inal & HardlyDifficult
 */
abstract contract NFTMarketOffer is
  FoundationTreasuryNode,
  ContextUpgradeable,
  FETHNode,
  NFTMarketCore,
  ReentrancyGuardUpgradeable,
  SendValueWithFallbackWithdraw,
  MarketFees,
  NFTMarketExhibition
{
  using AddressUpgradeable for address;
  using TimeLibrary for uint32;

  /// @notice Stores offer details for a specific NFT.
  struct Offer {
    // Slot 1: When increasing an offer, only this slot is updated.
    /// @notice The expiration timestamp of when this offer expires.
    uint32 expiration;
    /// @notice The amount, in wei, of the highest offer.
    uint96 amount;
    /// @notice First slot (of 16B) used for the offerReferrerAddress.
    // The offerReferrerAddress is the address used to pay the
    // referrer on an accepted offer.
    uint128 offerReferrerAddressSlot0;
    // Slot 2: When the buyer changes, both slots need updating
    /// @notice The address of the collector who made this offer.
    address buyer;
    /// @notice Second slot (of 4B) used for the offerReferrerAddress.
    uint32 offerReferrerAddressSlot1;
    // 96 bits (12B) are available in slot 1.
  }

  /// @notice Stores the highest offer for each NFT.
  mapping(address => mapping(uint256 => Offer)) private nftContractToIdToOffer;

  /**
   * @notice Emitted when an offer is accepted,
   * indicating that the NFT has been transferred and revenue from the sale distributed.
   * @dev The accepted total offer amount is `totalFees` + `creatorRev` + `sellerRev`.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @param buyer The address of the collector that made the offer which was accepted.
   * @param seller The address of the seller which accepted the offer.
   * @param totalFees The amount of ETH that was sent to Foundation & referrals for this sale.
   * @param creatorRev The amount of ETH that was sent to the creator for this sale.
   * @param sellerRev The amount of ETH that was sent to the owner for this sale.
   */
  event OfferAccepted(
    address indexed nftContract,
    uint256 indexed tokenId,
    address indexed buyer,
    address seller,
    uint256 totalFees,
    uint256 creatorRev,
    uint256 sellerRev
  );
  /**
   * @notice Emitted when an offer is invalidated due to other market activity.
   * When this occurs, the collector which made the offer has their FETH balance unlocked
   * and the funds are available to place other offers or to be withdrawn.
   * @dev This occurs when the offer is no longer eligible to be accepted,
   * e.g. when a bid is placed in an auction for this NFT.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   */
  event OfferInvalidated(address indexed nftContract, uint256 indexed tokenId);
  /**
   * @notice Emitted when an offer is made.
   * @dev The `amount` of the offer is locked in the FETH ERC-20 contract, guaranteeing that the funds
   * remain available until the `expiration` date.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @param buyer The address of the collector that made the offer to buy this NFT.
   * @param amount The amount, in wei, of the offer.
   * @param expiration The expiration timestamp for the offer.
   */
  event OfferMade(
    address indexed nftContract,
    uint256 indexed tokenId,
    address indexed buyer,
    uint256 amount,
    uint256 expiration
  );

  /**
   * @notice Accept the highest offer for an NFT.
   * @dev The offer must not be expired and the NFT owned + approved by the seller or
   * available in the market contract's escrow.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @param offerFrom The address of the collector that you wish to sell to.
   * If the current highest offer is not from this user, the transaction will revert.
   * This could happen if a last minute offer was made by another collector,
   * and would require the seller to try accepting again.
   * @param minAmount The minimum value of the highest offer for it to be accepted.
   * If the value is less than this amount, the transaction will revert.
   * This could happen if the original offer expires and is replaced with a smaller offer.
   */
  function acceptOffer(
    address nftContract,
    uint256 tokenId,
    address offerFrom,
    uint256 minAmount
  ) external nonReentrant {
    Offer storage offer = nftContractToIdToOffer[nftContract][tokenId];
    // Validate offer expiry and amount
    if (offer.expiration.hasExpired()) {
      revert NFTMarketOffer_Offer_Expired(offer.expiration);
    } else if (offer.amount < minAmount) {
      revert NFTMarketOffer_Offer_Below_Min_Amount(offer.amount);
    }
    // Validate the buyer
    if (offer.buyer != offerFrom) {
      revert NFTMarketOffer_Offer_From_Does_Not_Match(offer.buyer);
    }

    _acceptOffer(nftContract, tokenId);
  }

  /**
   * @notice Make an offer for any NFT which is valid for 24-25 hours.
   * The funds will be locked in the FETH token contract and become available once the offer is outbid or has expired.
   * @dev An offer may be made for an NFT before it is minted, although we generally not recommend you do that.
   * If there is a buy price set at this price or lower, that will be accepted instead of making an offer.
   * `msg.value` must be <= `amount` and any delta will be taken from the account's available FETH balance.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @param amount The amount to offer for this NFT.
   * @param referrer The referrer address for the offer.
   * @return expiration The timestamp for when this offer will expire.
   * This is provided as a return value in case another contract would like to leverage this information,
   * user's should refer to the expiration in the `OfferMade` event log.
   * If the buy price is accepted instead, `0` is returned as the expiration since that's n/a.
   */
  function makeOfferV2(
    address nftContract,
    uint256 tokenId,
    uint256 amount,
    address payable referrer
  ) external payable returns (uint256 expiration) {
    // If there is a buy price set at this price or lower, accept that instead.
    if (_autoAcceptBuyPrice(nftContract, tokenId, amount)) {
      // If the buy price is accepted, `0` is returned as the expiration since that's n/a.
      return 0;
    }

    if (_isInActiveAuction(nftContract, tokenId)) {
      revert NFTMarketOffer_Cannot_Be_Made_While_In_Auction();
    }

    Offer storage offer = nftContractToIdToOffer[nftContract][tokenId];
    address sender = _msgSender();

    if (offer.expiration.hasExpired()) {
      // This is a new offer for the NFT (no other offer found or the previous offer expired)

      // Lock the offer amount in FETH until the offer expires in 24-25 hours.
      expiration = feth.marketLockupFor{ value: msg.value }(sender, amount);
    } else {
      // A previous offer exists and has not expired

      uint256 minIncrement = _getMinIncrement(offer.amount);
      if (amount < minIncrement) {
        // A non-trivial increase in price is required to avoid sniping
        revert NFTMarketOffer_Offer_Must_Be_At_Least_Min_Amount(minIncrement);
      }

      // Unlock the previous offer so that the FETH tokens are available for other offers or to transfer / withdraw
      // and lock the new offer amount in FETH until the offer expires in 24-25 hours.
      expiration = feth.marketChangeLockup{ value: msg.value }(
        offer.buyer,
        offer.expiration,
        offer.amount,
        sender,
        amount
      );
    }

    // Record offer details
    offer.buyer = sender;
    // The FETH contract guarantees that the expiration fits into 32 bits.
    offer.expiration = uint32(expiration);
    // `amount` is capped by the ETH provided, which cannot realistically overflow 96 bits.
    offer.amount = uint96(amount);

    if (referrer == address(feth)) {
      // FETH cannot be paid as a referrer, clear the value instead.
      referrer = payable(0);
    }

    // Set offerReferrerAddressSlot0 to the first 16B of the referrer address.
    // By shifting the referrer 32 bits to the right we obtain the first 16B.
    offer.offerReferrerAddressSlot0 = uint128(uint160(address(referrer)) >> 32);
    // Set offerReferrerAddressSlot1 to the last 4B of the referrer address.
    // By casting the referrer address to 32bits we discard the first 16B.
    offer.offerReferrerAddressSlot1 = uint32(uint160(address(referrer)));

    emit OfferMade(nftContract, tokenId, sender, amount, expiration);
  }

  /**
   * @notice Accept the highest offer for an NFT from the `msg.sender` account.
   * The NFT will be transferred to the buyer and revenue from the sale will be distributed.
   * @dev The caller must validate the expiry and amount before calling this helper.
   * This may invalidate other market tools, such as clearing the buy price if set.
   */
  function _acceptOffer(address nftContract, uint256 tokenId) private {
    Offer memory offer = nftContractToIdToOffer[nftContract][tokenId];

    // Remove offer
    delete nftContractToIdToOffer[nftContract][tokenId];
    // Withdraw ETH from the buyer's account in the FETH token contract.
    feth.marketWithdrawLocked(offer.buyer, offer.expiration, offer.amount);

    address payable sender = payable(_msgSender());

    (
      address payable sellerReferrerPaymentAddress,
      uint16 sellerReferrerTakeRateInBasisPoints
    ) = _getExhibitionForPayment(nftContract, tokenId);

    // Transfer the NFT to the buyer.
    address owner = IERC721(nftContract).ownerOf(tokenId);
    if (owner == address(this)) {
      // The NFT is currently in escrow (e.g. it has a buy price set)
      // This should revert if `msg.sender` is not the owner of this NFT or if the NFT is in active auction.
      _transferFromEscrow(nftContract, tokenId, offer.buyer, sender);
    } else {
      // NFT should be in the seller's wallet. If attempted by the wrong sender or if the market is not approved this
      // will revert.
      IERC721(nftContract).transferFrom(sender, offer.buyer, tokenId);
    }

    // Distribute revenue for this sale leveraging the ETH received from the FETH contract in the line above.
    (uint256 totalFees, uint256 creatorRev, uint256 sellerRev) = _distributeFunds(
      nftContract,
      tokenId,
      sender,
      offer.amount,
      _getOfferReferrerFromSlots(offer.offerReferrerAddressSlot0, offer.offerReferrerAddressSlot1),
      sellerReferrerPaymentAddress,
      sellerReferrerTakeRateInBasisPoints
    );

    emit OfferAccepted(nftContract, tokenId, offer.buyer, sender, totalFees, creatorRev, sellerRev);
  }

  /**
   * @inheritdoc NFTMarketCore
   * @dev Invalidates the highest offer when an auction is kicked off, if one is found.
   */
  function _beforeAuctionStarted(address nftContract, uint256 tokenId) internal virtual override {
    _invalidateOffer(nftContract, tokenId);
    super._beforeAuctionStarted(nftContract, tokenId);
  }

  /**
   * @inheritdoc NFTMarketCore
   */
  function _autoAcceptOffer(address nftContract, uint256 tokenId, uint256 minAmount) internal override returns (bool) {
    Offer storage offer = nftContractToIdToOffer[nftContract][tokenId];
    if (offer.expiration.hasExpired() || offer.amount < minAmount) {
      // No offer found, the most recent offer is now expired, or the highest offer is below the minimum amount.
      return false;
    }

    _acceptOffer(nftContract, tokenId);
    return true;
  }

  /**
   * @inheritdoc NFTMarketCore
   */
  function _cancelSendersOffer(address nftContract, uint256 tokenId) internal override {
    Offer storage offer = nftContractToIdToOffer[nftContract][tokenId];
    if (offer.buyer == _msgSender()) {
      _invalidateOffer(nftContract, tokenId);
    }
  }

  /**
   * @notice Invalidates the offer and frees ETH from escrow, if the offer has not already expired.
   * @dev Offers are not invalidated when the NFT is purchased by accepting the buy price unless it
   * was purchased by the same user.
   * The user which just purchased the NFT may have buyer's remorse and promptly decide they want a fast exit,
   * accepting a small loss to limit their exposure.
   */
  function _invalidateOffer(address nftContract, uint256 tokenId) private {
    if (!nftContractToIdToOffer[nftContract][tokenId].expiration.hasExpired()) {
      // An offer was found and it has not already expired
      Offer memory offer = nftContractToIdToOffer[nftContract][tokenId];

      // Remove offer
      delete nftContractToIdToOffer[nftContract][tokenId];

      // Unlock the offer so that the FETH tokens are available for other offers or to transfer / withdraw
      feth.marketUnlockFor(offer.buyer, offer.expiration, offer.amount);

      emit OfferInvalidated(nftContract, tokenId);
    }
  }

  /**
   * @notice Returns the minimum amount a collector must offer for this NFT in order for the offer to be valid.
   * @dev Offers for this NFT which are less than this value will revert.
   * Once the previous offer has expired smaller offers can be made.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @return minimum The minimum amount that must be offered for this NFT.
   */
  function getMinOfferAmount(address nftContract, uint256 tokenId) external view returns (uint256 minimum) {
    Offer storage offer = nftContractToIdToOffer[nftContract][tokenId];
    if (!offer.expiration.hasExpired()) {
      return _getMinIncrement(offer.amount);
    }
    // Absolute min is anything > 0
    return 1;
  }

  /**
   * @notice Returns details about the current highest offer for an NFT.
   * @dev Default values are returned if there is no offer or the offer has expired.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @return buyer The address of the buyer that made the current highest offer.
   * Returns `address(0)` if there is no offer or the most recent offer has expired.
   * @return expiration The timestamp that the current highest offer expires.
   * Returns `0` if there is no offer or the most recent offer has expired.
   * @return amount The amount being offered for this NFT.
   * Returns `0` if there is no offer or the most recent offer has expired.
   */
  function getOffer(
    address nftContract,
    uint256 tokenId
  ) external view returns (address buyer, uint256 expiration, uint256 amount) {
    Offer storage offer = nftContractToIdToOffer[nftContract][tokenId];
    if (offer.expiration.hasExpired()) {
      // Offer not found or has expired
      return (address(0), 0, 0);
    }

    // An offer was found and it has not yet expired.
    return (offer.buyer, offer.expiration, offer.amount);
  }

  /**
   * @notice Returns the current highest offer's referral for an NFT.
   * @dev Default value of `payable(0)` is returned if
   * there is no offer, the offer has expired or does not have a referral.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @return referrer The payable address of the referrer for the offer.
   */
  function getOfferReferrer(address nftContract, uint256 tokenId) external view returns (address payable referrer) {
    Offer storage offer = nftContractToIdToOffer[nftContract][tokenId];
    if (offer.expiration.hasExpired()) {
      // Offer not found or has expired
      return payable(0);
    }
    return _getOfferReferrerFromSlots(offer.offerReferrerAddressSlot0, offer.offerReferrerAddressSlot1);
  }

  function _getOfferReferrerFromSlots(
    uint128 offerReferrerAddressSlot0,
    uint32 offerReferrerAddressSlot1
  ) private pure returns (address payable referrer) {
    // Stitch offerReferrerAddressSlot0 and offerReferrerAddressSlot1 to obtain the payable offerReferrerAddress.
    // Left shift offerReferrerAddressSlot0 by 32 bits OR it with offerReferrerAddressSlot1.
    referrer = payable(address((uint160(offerReferrerAddressSlot0) << 32) | uint160(offerReferrerAddressSlot1)));
  }

  /**
   * @notice This empty reserved space is put in place to allow future versions to add new
   * variables without shifting down storage in the inheritance chain.
   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
   */
  uint256[1_000] private __gap;
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

/**
 * @title Reserves space previously occupied by private sales.
 * @author batu-inal & HardlyDifficult
 */
abstract contract NFTMarketPrivateSaleGap {
  // Original data:
  // bytes32 private __gap_was_DOMAIN_SEPARATOR;
  // mapping(address => mapping(uint256 => mapping(address => mapping(address => mapping(uint256 =>
  //   mapping(uint256 => bool)))))) private privateSaleInvalidated;
  // uint256[999] private __gap;

  /**
   * @notice This empty reserved space is put in place to allow future versions to add new
   * variables without shifting down storage in the inheritance chain.
   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
   * @dev 1 slot was consumed by privateSaleInvalidated.
   */
  uint256[1001] private __gap;
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

import "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";

import "../../interfaces/internal/routes/INFTMarketReserveAuction.sol";

import "../../libraries/TimeLibrary.sol";

import "../shared/FoundationTreasuryNode.sol";
import "../shared/FETHNode.sol";
import "../shared/MarketFees.sol";
import "../shared/MarketSharedCore.sol";
import "../shared/SendValueWithFallbackWithdraw.sol";

import "./NFTMarketAuction.sol";
import "./NFTMarketCore.sol";
import "./NFTMarketExhibition.sol";

/// @param auctionId The already listed auctionId for this NFT.
error NFTMarketReserveAuction_Already_Listed(uint256 auctionId);
/// @param minAmount The minimum amount that must be bid in order for it to be accepted.
error NFTMarketReserveAuction_Bid_Must_Be_At_Least_Min_Amount(uint256 minAmount);
/// @param reservePrice The current reserve price.
error NFTMarketReserveAuction_Cannot_Bid_Lower_Than_Reserve_Price(uint256 reservePrice);
/// @param endTime The timestamp at which the auction had ended.
error NFTMarketReserveAuction_Cannot_Bid_On_Ended_Auction(uint256 endTime);
error NFTMarketReserveAuction_Cannot_Bid_On_Nonexistent_Auction();
error NFTMarketReserveAuction_Cannot_Finalize_Already_Settled_Auction();
/// @param endTime The timestamp at which the auction will end.
error NFTMarketReserveAuction_Cannot_Finalize_Auction_In_Progress(uint256 endTime);
error NFTMarketReserveAuction_Cannot_Rebid_Over_Outstanding_Bid();
error NFTMarketReserveAuction_Cannot_Update_Auction_In_Progress();
/// @param maxDuration The maximum configuration for a duration of the auction, in seconds.
error NFTMarketReserveAuction_Exceeds_Max_Duration(uint256 maxDuration);
/// @param extensionDuration The extension duration, in seconds.
error NFTMarketReserveAuction_Less_Than_Extension_Duration(uint256 extensionDuration);
error NFTMarketReserveAuction_Must_Set_Non_Zero_Reserve_Price();
/// @param seller The current owner of the NFT.
error NFTMarketReserveAuction_Not_Matching_Seller(address seller);
/// @param owner The current owner of the NFT.
error NFTMarketReserveAuction_Only_Owner_Can_Update_Auction(address owner);
error NFTMarketReserveAuction_Price_Already_Set();
error NFTMarketReserveAuction_Too_Much_Value_Provided();

/**
 * @title Allows the owner of an NFT to list it in auction.
 * @notice NFTs in auction are escrowed in the market contract.
 * @dev There is room to optimize the storage for auctions, significantly reducing gas costs.
 * This may be done in the future, but for now it will remain as is in order to ease upgrade compatibility.
 * @author batu-inal & HardlyDifficult & reggieag
 */
abstract contract NFTMarketReserveAuction is
  INFTMarketReserveAuction,
  FoundationTreasuryNode,
  ContextUpgradeable,
  FETHNode,
  MarketSharedCore,
  NFTMarketCore,
  ReentrancyGuardUpgradeable,
  SendValueWithFallbackWithdraw,
  MarketFees,
  NFTMarketExhibition,
  NFTMarketAuction
{
  using TimeLibrary for uint256;

  /// @notice The auction configuration for a specific NFT.
  struct ReserveAuction {
    /// @notice The address of the NFT contract.
    address nftContract;
    /// @notice The id of the NFT.
    uint256 tokenId;
    /// @notice The owner of the NFT which listed it in auction.
    address payable seller;
    /// @notice The duration for this auction.
    uint256 duration;
    /// @notice The extension window for this auction.
    uint256 extensionDuration;
    /// @notice The time at which this auction will not accept any new bids.
    /// @dev This is `0` until the first bid is placed.
    uint256 endTime;
    /// @notice The current highest bidder in this auction.
    /// @dev This is `address(0)` until the first bid is placed.
    address payable bidder;
    /// @notice The latest price of the NFT in this auction.
    /// @dev This is set to the reserve price, and then to the highest bid once the auction has started.
    uint256 amount;
  }

  /// @notice Stores the auction configuration for a specific NFT.
  /// @dev This allows us to modify the storage struct without changing external APIs.
  struct ReserveAuctionStorage {
    // Slot 0
    /// @notice The address of the NFT contract.
    address nftContract;
    // (96-bits free space)

    // Slot 1
    /// @notice The id of the NFT.
    uint256 tokenId;
    // (slot full)

    // Slot 2
    /// @notice The owner of the NFT which listed it in auction.
    address payable seller;
    /// @notice First slot (12 bytes) used for the bidReferrerAddress.
    /// The bidReferrerAddress is the address used to pay the referrer on finalize.
    /// @dev This approach is used in order to pack storage, saving gas.
    uint96 bidReferrerAddressSlot0;
    // (slot full)

    // Slot 3
    /// @dev This field is no longer used but was previously assigned to.
    uint256 __gap_was_duration;
    // (slot full)

    // Slot 4
    /// @dev This field is no longer used but was previous assigned to.
    uint256 __gap_was_extensionDuration;
    // (slot full)

    // Slot 5
    /// @notice The time at which this auction will not accept any new bids.
    /// @dev This is `0` until the first bid is placed.
    uint256 endTime;
    // (slot full)

    // Slot 6
    /// @notice The current highest bidder in this auction.
    /// @dev This is `address(0)` until the first bid is placed.
    address payable bidder;
    /// @notice Second slot (8 bytes) used for the bidReferrerAddress.
    uint64 bidReferrerAddressSlot1;
    /// @dev Auction duration length in seconds.
    uint32 duration;
    // (slot full)

    // Slot 7
    /// @notice The latest price of the NFT in this auction.
    /// @dev This is set to the reserve price, and then to the highest bid once the auction has started.
    uint256 amount;
    // (slot full)
  }

  /// @notice The auction configuration for a specific auction id.
  mapping(address => mapping(uint256 => uint256)) private nftContractToTokenIdToAuctionId;
  /// @notice The auction id for a specific NFT.
  /// @dev This is deleted when an auction is finalized or canceled.
  mapping(uint256 => ReserveAuctionStorage) private auctionIdToAuction;

  /**
   * @dev Removing old unused variables in an upgrade safe way. Was:
   * uint256 private __gap_was_minPercentIncrementInBasisPoints;
   * uint256 private __gap_was_maxBidIncrementRequirement;
   * uint256 private __gap_was_duration;
   * uint256 private __gap_was_extensionDuration;
   * uint256 private __gap_was_goLiveDate;
   */
  uint256[5] private __gap_was_config;

  /// @notice Default for how long an auction lasts for once the first bid has been received.
  uint256 private immutable DEFAULT_DURATION;

  /// @notice The window for auction extensions, any bid placed in the final 15 minutes
  /// of an auction will reset the time remaining to 15 minutes.
  uint256 private constant EXTENSION_DURATION = 15 minutes;

  /// @notice Caps the max duration that may be configured for an auction.
  uint256 private constant MAX_DURATION = 7 days;

  /**
   * @notice Emitted when a bid is placed.
   * @param auctionId The id of the auction this bid was for.
   * @param bidder The address of the bidder.
   * @param amount The amount of the bid.
   * @param endTime The new end time of the auction (which may have been set or extended by this bid).
   */
  event ReserveAuctionBidPlaced(uint256 indexed auctionId, address indexed bidder, uint256 amount, uint256 endTime);
  /**
   * @notice Emitted when an auction is canceled.
   * @dev This is only possible if the auction has not received any bids.
   * @param auctionId The id of the auction that was canceled.
   */
  event ReserveAuctionCanceled(uint256 indexed auctionId);
  /**
   * @notice Emitted when an NFT is listed for auction.
   * @param seller The address of the seller.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @param duration The duration of the auction (always 24-hours).
   * @param extensionDuration The duration of the auction extension window (always 15-minutes).
   * @param reservePrice The reserve price to kick off the auction.
   * @param auctionId The id of the auction that was created.
   */
  event ReserveAuctionCreated(
    address indexed seller,
    address indexed nftContract,
    uint256 indexed tokenId,
    uint256 duration,
    uint256 extensionDuration,
    uint256 reservePrice,
    uint256 auctionId
  );
  /**
   * @notice Emitted when an auction that has already ended is finalized,
   * indicating that the NFT has been transferred and revenue from the sale distributed.
   * @dev The amount of the highest bid / final sale price for this auction
   * is `totalFees` + `creatorRev` + `sellerRev`.
   * @param auctionId The id of the auction that was finalized.
   * @param seller The address of the seller.
   * @param bidder The address of the highest bidder that won the NFT.
   * @param totalFees The amount of ETH that was sent to Foundation & referrals for this sale.
   * @param creatorRev The amount of ETH that was sent to the creator for this sale.
   * @param sellerRev The amount of ETH that was sent to the owner for this sale.
   */
  event ReserveAuctionFinalized(
    uint256 indexed auctionId,
    address indexed seller,
    address indexed bidder,
    uint256 totalFees,
    uint256 creatorRev,
    uint256 sellerRev
  );
  /**
   * @notice Emitted when an auction is invalidated due to other market activity.
   * @dev This occurs when the NFT is sold another way, such as with `buy` or `acceptOffer`.
   * @param auctionId The id of the auction that was invalidated.
   */
  event ReserveAuctionInvalidated(uint256 indexed auctionId);
  /**
   * @notice Emitted when the auction's reserve price is changed.
   * @dev This is only possible if the auction has not received any bids.
   * @param auctionId The id of the auction that was updated.
   * @param reservePrice The new reserve price for the auction.
   */
  event ReserveAuctionUpdated(uint256 indexed auctionId, uint256 reservePrice);

  /// @notice Confirms that the reserve price is not zero.
  modifier onlyValidAuctionConfig(uint256 reservePrice) {
    if (reservePrice == 0) {
      revert NFTMarketReserveAuction_Must_Set_Non_Zero_Reserve_Price();
    }
    _;
  }

  /**
   * @notice Configures the duration for auctions.
   * @param duration The duration for auctions, in seconds.
   */
  constructor(uint256 duration) {
    if (duration > MAX_DURATION) {
      // This ensures that math in this file will not overflow due to a huge duration.
      revert NFTMarketReserveAuction_Exceeds_Max_Duration(MAX_DURATION);
    }
    if (duration < EXTENSION_DURATION) {
      // The auction duration configuration must be greater than the extension window of 15 minutes
      revert NFTMarketReserveAuction_Less_Than_Extension_Duration(EXTENSION_DURATION);
    }

    DEFAULT_DURATION = duration;
  }

  /**
   * @notice If an auction has been created but has not yet received bids, it may be canceled by the seller.
   * @dev The NFT is transferred back to the owner unless there is still a buy price set.
   * @param auctionId The id of the auction to cancel.
   */
  function cancelReserveAuction(uint256 auctionId) external nonReentrant {
    ReserveAuctionStorage memory auction = auctionIdToAuction[auctionId];
    if (auction.seller != _msgSender()) {
      revert NFTMarketReserveAuction_Only_Owner_Can_Update_Auction(auction.seller);
    }
    if (auction.endTime != 0) {
      revert NFTMarketReserveAuction_Cannot_Update_Auction_In_Progress();
    }

    // Remove the auction.
    delete nftContractToTokenIdToAuctionId[auction.nftContract][auction.tokenId];
    delete auctionIdToAuction[auctionId];
    _removeNftFromExhibition(auction.nftContract, auction.tokenId);

    // Transfer the NFT unless it still has a buy price set.
    _transferFromEscrowIfAvailable(auction.nftContract, auction.tokenId, auction.seller);

    emit ReserveAuctionCanceled(auctionId);
  }

  /**
   * @notice [DEPRECATED] use `createReserveAuctionV3` instead.
   * Creates an auction for the given NFT.
   * The NFT is held in escrow until the auction is finalized or canceled.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @param reservePrice The initial reserve price for the auction.
   */
  function createReserveAuction(address nftContract, uint256 tokenId, uint256 reservePrice) external {
    createReserveAuctionV3({
      nftContract: nftContract,
      tokenId: tokenId,
      exhibitionId: 0, // no exhibition
      reservePrice: reservePrice,
      duration: 0 // use default duration
    });
  }

  /**
   * @notice [DEPRECATED] use `createReserveAuctionV3` instead.
   * Creates an auction for the given NFT.
   * The NFT is held in escrow until the auction is finalized or canceled.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @param reservePrice The initial reserve price for the auction.
   * @param exhibitionId The exhibition to list with, or 0 if n/a.
   * @return auctionId The id of the auction that was created.
   */
  function createReserveAuctionV2(
    address nftContract,
    uint256 tokenId,
    uint256 reservePrice,
    uint256 exhibitionId
  ) external returns (uint256 auctionId) {
    auctionId = createReserveAuctionV3({
      nftContract: nftContract,
      tokenId: tokenId,
      exhibitionId: exhibitionId,
      reservePrice: reservePrice,
      duration: 0 // use default duration
    });
  }

  /**
   * @notice Creates an auction for the given NFT.
   * The NFT is held in escrow until the auction is finalized or canceled.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @param exhibitionId The exhibition to list with, or 0 if n/a.
   * @param reservePrice The initial reserve price for the auction.
   * @param duration The length of the auction, in seconds.
   * @return auctionId The id of the auction that was created.
   */
  function createReserveAuctionV3(
    address nftContract,
    uint256 tokenId,
    uint256 exhibitionId,
    uint256 reservePrice,
    uint256 duration
  ) public nonReentrant onlyValidAuctionConfig(reservePrice) returns (uint256 auctionId) {
    if (duration == 0) {
      duration = DEFAULT_DURATION;
    } else {
      if (duration > MAX_DURATION) {
        // This ensures that math in this file will not overflow due to a huge duration.
        revert NFTMarketReserveAuction_Exceeds_Max_Duration(MAX_DURATION);
      }
      if (duration < EXTENSION_DURATION) {
        // The auction duration configuration must be greater than the extension window of 15 minutes
        revert NFTMarketReserveAuction_Less_Than_Extension_Duration(EXTENSION_DURATION);
      }
    }

    auctionId = _getNextAndIncrementAuctionId();

    // If the `msg.sender` is not the owner of the NFT, transferring into escrow should fail.
    _transferToEscrow(nftContract, tokenId);

    // This check must be after _transferToEscrow in case auto-settle was required
    if (nftContractToTokenIdToAuctionId[nftContract][tokenId] != 0) {
      revert NFTMarketReserveAuction_Already_Listed(nftContractToTokenIdToAuctionId[nftContract][tokenId]);
    }

    // Store the auction details
    address payable sender = payable(_msgSender());
    nftContractToTokenIdToAuctionId[nftContract][tokenId] = auctionId;
    ReserveAuctionStorage storage auction = auctionIdToAuction[auctionId];
    auction.nftContract = nftContract;
    auction.tokenId = tokenId;
    auction.seller = sender;
    auction.amount = reservePrice;
    if (duration != DEFAULT_DURATION) {
      // If duration is DEFAULT_DURATION, we don't need to write to storage.
      // Safe cast is not required since duration is capped by MAX_DURATION.
      auction.duration = uint32(duration);
    }

    _addNftToExhibition(nftContract, tokenId, exhibitionId);

    emit ReserveAuctionCreated({
      seller: sender,
      nftContract: nftContract,
      tokenId: tokenId,
      duration: duration,
      extensionDuration: EXTENSION_DURATION,
      reservePrice: reservePrice,
      auctionId: auctionId
    });
  }

  /**
   * @notice Once the countdown has expired for an auction, anyone can settle the auction.
   * This will send the NFT to the highest bidder and distribute revenue for this sale.
   * @param auctionId The id of the auction to settle.
   */
  function finalizeReserveAuction(uint256 auctionId) external nonReentrant {
    if (auctionIdToAuction[auctionId].endTime == 0) {
      revert NFTMarketReserveAuction_Cannot_Finalize_Already_Settled_Auction();
    }
    _finalizeReserveAuction({ auctionId: auctionId, keepInEscrow: false });
  }

  /**
   * @notice [DEPRECATED] use `placeBidV2` instead.
   * Place a bid in an auction.
   * A bidder may place a bid which is at least the value defined by `getMinBidAmount`.
   * If this is the first bid on the auction, the countdown will begin.
   * If there is already an outstanding bid, the previous bidder will be refunded at this time
   * and if the bid is placed in the final moments of the auction, the countdown may be extended.
   * @param auctionId The id of the auction to bid on.
   */
  function placeBid(uint256 auctionId) external payable {
    placeBidV2({ auctionId: auctionId, amount: msg.value, referrer: payable(0) });
  }

  /**
   * @notice Place a bid in an auction.
   * A bidder may place a bid which is at least the amount defined by `getMinBidAmount`.
   * If this is the first bid on the auction, the countdown will begin.
   * If there is already an outstanding bid, the previous bidder will be refunded at this time
   * and if the bid is placed in the final moments of the auction, the countdown may be extended.
   * @dev `amount` - `msg.value` is withdrawn from the bidder's FETH balance.
   * @param auctionId The id of the auction to bid on.
   * @param amount The amount to bid, if this is more than `msg.value` funds will be withdrawn from your FETH balance.
   * @param referrer The address of the referrer of this bid, or 0 if n/a.
   */
  function placeBidV2(uint256 auctionId, uint256 amount, address payable referrer) public payable nonReentrant {
    ReserveAuctionStorage storage auction = auctionIdToAuction[auctionId];

    if (auction.amount == 0) {
      // No auction found
      revert NFTMarketReserveAuction_Cannot_Bid_On_Nonexistent_Auction();
    } else if (amount < msg.value) {
      // The amount is specified by the bidder, so if too much ETH is sent then something went wrong.
      revert NFTMarketReserveAuction_Too_Much_Value_Provided();
    }

    uint256 endTime = auction.endTime;
    address payable sender = payable(_msgSender());

    // Store the bid referral
    if (referrer == address(feth)) {
      // FETH cannot be paid as a referrer, clear the value instead.
      referrer = payable(0);
    }
    if (referrer != address(0) || endTime != 0) {
      auction.bidReferrerAddressSlot0 = uint96(uint160(address(referrer)) >> 64);
      auction.bidReferrerAddressSlot1 = uint64(uint160(address(referrer)));
    }

    if (endTime == 0) {
      // This is the first bid, kicking off the auction.

      if (amount < auction.amount) {
        // The bid must be >= the reserve price.
        revert NFTMarketReserveAuction_Cannot_Bid_Lower_Than_Reserve_Price(auction.amount);
      }

      // Notify other market tools that an auction for this NFT has been kicked off.
      // The only state change before this call is potentially withdrawing funds from FETH.
      _beforeAuctionStarted(auction.nftContract, auction.tokenId);

      // Store the bid details.
      auction.amount = amount;
      auction.bidder = sender;

      // On the first bid, set the endTime to now + duration.
      uint256 duration = auction.duration;
      if (duration == 0) {
        duration = DEFAULT_DURATION;
      }
      unchecked {
        // Duration can't be more than MAX_DURATION (7 days), so the below can't overflow.
        endTime = block.timestamp + duration;
      }
      auction.endTime = endTime;
    } else {
      if (endTime.hasExpired()) {
        // The auction has already ended.
        revert NFTMarketReserveAuction_Cannot_Bid_On_Ended_Auction(endTime);
      } else if (auction.bidder == sender) {
        // We currently do not allow a bidder to increase their bid unless another user has outbid them first.
        revert NFTMarketReserveAuction_Cannot_Rebid_Over_Outstanding_Bid();
      } else {
        uint256 minIncrement = _getMinIncrement(auction.amount);
        if (amount < minIncrement) {
          // If this bid outbids another, it must be at least 10% greater than the last bid.
          revert NFTMarketReserveAuction_Bid_Must_Be_At_Least_Min_Amount(minIncrement);
        }
      }

      // Cache and update bidder state
      uint256 originalAmount = auction.amount;
      address payable originalBidder = auction.bidder;
      auction.amount = amount;
      auction.bidder = sender;

      unchecked {
        // When a bid outbids another, check to see if a time extension should apply.
        // We confirmed that the auction has not ended, so endTime is always >= the current timestamp.
        // Current time plus extension duration (always 15 mins) cannot overflow.
        uint256 endTimeWithExtension = block.timestamp + EXTENSION_DURATION;
        if (endTime < endTimeWithExtension) {
          endTime = endTimeWithExtension;
          auction.endTime = endTime;
        }
      }

      // Refund the previous bidder
      _sendValueWithFallbackWithdraw({
        user: originalBidder,
        amount: originalAmount,
        gasLimit: SEND_VALUE_GAS_LIMIT_SINGLE_RECIPIENT
      });
    }

    _tryUseFETHBalance({ totalAmount: amount, shouldRefundSurplus: false });

    emit ReserveAuctionBidPlaced({ auctionId: auctionId, bidder: sender, amount: amount, endTime: endTime });
  }

  /**
   * @notice If an auction has been created but has not yet received bids, the reservePrice may be
   * changed by the seller.
   * @param auctionId The id of the auction to change.
   * @param reservePrice The new reserve price for this auction.
   */
  function updateReserveAuction(uint256 auctionId, uint256 reservePrice) external onlyValidAuctionConfig(reservePrice) {
    ReserveAuctionStorage storage auction = auctionIdToAuction[auctionId];
    if (auction.seller != _msgSender()) {
      revert NFTMarketReserveAuction_Only_Owner_Can_Update_Auction(auction.seller);
    } else if (auction.endTime != 0) {
      revert NFTMarketReserveAuction_Cannot_Update_Auction_In_Progress();
    } else if (auction.amount == reservePrice) {
      revert NFTMarketReserveAuction_Price_Already_Set();
    }

    // Update the current reserve price.
    auction.amount = reservePrice;

    emit ReserveAuctionUpdated(auctionId, reservePrice);
  }

  /**
   * @notice Settle an auction that has already ended.
   * This will send the NFT to the highest bidder and distribute revenue for this sale.
   * @param keepInEscrow If true, the NFT will be kept in escrow to save gas by avoiding
   * redundant transfers if the NFT should remain in escrow, such as when the new owner
   * sets a buy price or lists it in a new auction.
   */
  function _finalizeReserveAuction(uint256 auctionId, bool keepInEscrow) private {
    ReserveAuctionStorage memory auction = auctionIdToAuction[auctionId];

    if (!auction.endTime.hasExpired()) {
      revert NFTMarketReserveAuction_Cannot_Finalize_Auction_In_Progress(auction.endTime);
    }
    (
      address payable sellerReferrerPaymentAddress,
      uint16 sellerReferrerTakeRateInBasisPoints
    ) = _getExhibitionForPayment(auction.nftContract, auction.tokenId);

    // Remove the auction.
    delete nftContractToTokenIdToAuctionId[auction.nftContract][auction.tokenId];
    delete auctionIdToAuction[auctionId];

    if (!keepInEscrow) {
      // The seller was authorized when the auction was originally created
      super._transferFromEscrow({
        nftContract: auction.nftContract,
        tokenId: auction.tokenId,
        recipient: auction.bidder,
        authorizeSeller: address(0)
      });
    }

    // Distribute revenue for this sale.
    (uint256 totalFees, uint256 creatorRev, uint256 sellerRev) = _distributeFunds(
      auction.nftContract,
      auction.tokenId,
      auction.seller,
      auction.amount,
      payable(address((uint160(auction.bidReferrerAddressSlot0) << 64) | uint160(auction.bidReferrerAddressSlot1))),
      sellerReferrerPaymentAddress,
      sellerReferrerTakeRateInBasisPoints
    );

    emit ReserveAuctionFinalized(auctionId, auction.seller, auction.bidder, totalFees, creatorRev, sellerRev);
  }

  /**
   * @inheritdoc NFTMarketCore
   * @dev If an auction is found:
   *  - If the auction is over, it will settle the auction and confirm the new seller won the auction.
   *  - If the auction has not received a bid, it will invalidate the auction.
   *  - If the auction is in progress, this will revert.
   */
  function _transferFromEscrow(
    address nftContract,
    uint256 tokenId,
    address recipient,
    address authorizeSeller
  ) internal virtual override {
    uint256 auctionId = nftContractToTokenIdToAuctionId[nftContract][tokenId];
    if (auctionId != 0) {
      ReserveAuctionStorage storage auction = auctionIdToAuction[auctionId];
      if (auction.endTime == 0) {
        // The auction has not received any bids yet so it may be invalided.

        if (authorizeSeller != address(0) && auction.seller != authorizeSeller) {
          // The account trying to transfer the NFT is not the current owner.
          revert NFTMarketReserveAuction_Not_Matching_Seller(auction.seller);
        }

        // Remove the auction.
        delete nftContractToTokenIdToAuctionId[nftContract][tokenId];
        delete auctionIdToAuction[auctionId];
        _removeNftFromExhibition(nftContract, tokenId);

        emit ReserveAuctionInvalidated(auctionId);
      } else {
        // If the auction has ended, the highest bidder will be the new owner
        // and if the auction is in progress, this will revert.

        // `authorizeSeller != address(0)` does not apply here since an unsettled auction must go
        // through this path to know who the authorized seller should be.
        if (auction.bidder != authorizeSeller) {
          revert NFTMarketReserveAuction_Not_Matching_Seller(auction.bidder);
        }

        // Finalization will revert if the auction has not yet ended.
        _finalizeReserveAuction({ auctionId: auctionId, keepInEscrow: true });
      }
      // The seller authorization has been confirmed.
      authorizeSeller = address(0);
    }

    super._transferFromEscrow(nftContract, tokenId, recipient, authorizeSeller);
  }

  /**
   * @inheritdoc NFTMarketCore
   * @dev Checks if there is an auction for this NFT before allowing the transfer to continue.
   */
  function _transferFromEscrowIfAvailable(
    address nftContract,
    uint256 tokenId,
    address recipient
  ) internal virtual override {
    if (nftContractToTokenIdToAuctionId[nftContract][tokenId] == 0) {
      // No auction was found

      super._transferFromEscrowIfAvailable(nftContract, tokenId, recipient);
    }
  }

  /**
   * @inheritdoc NFTMarketCore
   */
  function _transferToEscrow(address nftContract, uint256 tokenId) internal virtual override {
    uint256 auctionId = nftContractToTokenIdToAuctionId[nftContract][tokenId];
    if (auctionId == 0) {
      // NFT is not in auction
      super._transferToEscrow(nftContract, tokenId);
      return;
    }
    // Using storage saves gas since most of the data is not needed
    ReserveAuctionStorage storage auction = auctionIdToAuction[auctionId];
    address sender = _msgSender();
    if (auction.endTime == 0) {
      // Reserve price set, confirm the seller is a match
      if (auction.seller != sender) {
        revert NFTMarketReserveAuction_Not_Matching_Seller(auction.seller);
      }
    } else {
      // Auction in progress, confirm the highest bidder is a match
      if (auction.bidder != sender) {
        revert NFTMarketReserveAuction_Not_Matching_Seller(auction.bidder);
      }

      // Finalize auction but leave NFT in escrow, reverts if the auction has not ended
      _finalizeReserveAuction({ auctionId: auctionId, keepInEscrow: true });
    }
  }

  /**
   * @notice Returns the minimum amount a bidder must spend to participate in an auction.
   * Bids must be greater than or equal to this value or they will revert.
   * @param auctionId The id of the auction to check.
   * @return minimum The minimum amount for a bid to be accepted.
   */
  function getMinBidAmount(uint256 auctionId) external view returns (uint256 minimum) {
    ReserveAuctionStorage storage auction = auctionIdToAuction[auctionId];
    if (auction.endTime == 0) {
      return auction.amount;
    }
    return _getMinIncrement(auction.amount);
  }

  /**
   * @notice Returns auction details for a given auctionId.
   * @param auctionId The id of the auction to lookup.
   */
  function getReserveAuction(uint256 auctionId) external view returns (ReserveAuction memory auction) {
    ReserveAuctionStorage storage auctionStorage = auctionIdToAuction[auctionId];
    uint256 duration = auctionStorage.duration;
    if (duration == 0) {
      duration = DEFAULT_DURATION;
    }
    auction = ReserveAuction(
      auctionStorage.nftContract,
      auctionStorage.tokenId,
      auctionStorage.seller,
      duration,
      EXTENSION_DURATION,
      auctionStorage.endTime,
      auctionStorage.bidder,
      auctionStorage.amount
    );
  }

  /**
   * @notice Returns the auctionId for a given NFT, or 0 if no auction is found.
   * @dev If an auction is canceled, it will not be returned. However the auction may be over and pending finalization.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @return auctionId The id of the auction, or 0 if no auction is found.
   */
  function getReserveAuctionIdFor(address nftContract, uint256 tokenId) external view returns (uint256 auctionId) {
    auctionId = nftContractToTokenIdToAuctionId[nftContract][tokenId];
  }

  /**
   * @notice Returns the referrer for the current highest bid in the auction, or address(0).
   */
  function getReserveAuctionBidReferrer(uint256 auctionId) external view returns (address payable referrer) {
    ReserveAuctionStorage storage auction = auctionIdToAuction[auctionId];
    referrer = payable(
      address((uint160(auction.bidReferrerAddressSlot0) << 64) | uint160(auction.bidReferrerAddressSlot1))
    );
  }

  /**
   * @inheritdoc MarketSharedCore
   * @dev Returns the seller that has the given NFT in escrow for an auction,
   * or bubbles the call up for other considerations.
   */
  function _getSellerOf(
    address nftContract,
    uint256 tokenId
  ) internal view virtual override returns (address payable seller) {
    seller = auctionIdToAuction[nftContractToTokenIdToAuctionId[nftContract][tokenId]].seller;
    if (seller == address(0)) {
      seller = super._getSellerOf(nftContract, tokenId);
    }
  }

  /**
   * @inheritdoc NFTMarketCore
   */
  function _isInActiveAuction(address nftContract, uint256 tokenId) internal view override returns (bool) {
    uint256 auctionId = nftContractToTokenIdToAuctionId[nftContract][tokenId];
    return auctionId != 0 && !auctionIdToAuction[auctionId].endTime.hasExpired();
  }

  /**
   * @notice This empty reserved space is put in place to allow future versions to add new
   * variables without shifting down storage in the inheritance chain.
   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
   */
  uint256[1_000] private __gap;
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

/// Constant values shared across mixins.

/**
 * @dev 100% in basis points.
 */
uint256 constant BASIS_POINTS = 10_000;

/**
 * @dev The default admin role defined by OZ ACL modules.
 */
bytes32 constant DEFAULT_ADMIN_ROLE = 0x00;

////////////////////////////////////////////////////////////////
// Royalties & Take Rates
////////////////////////////////////////////////////////////////

/**
 * @dev The max take rate an exhibition can have.
 */
uint256 constant MAX_EXHIBITION_TAKE_RATE = 5_000;

/**
 * @dev Cap the number of royalty recipients.
 * A cap is required to ensure gas costs are not too high when a sale is settled.
 */
uint256 constant MAX_ROYALTY_RECIPIENTS = 5;

/**
 * @dev Default royalty cut paid out on secondary sales.
 * Set to 10% of the secondary sale.
 */
uint96 constant ROYALTY_IN_BASIS_POINTS = 1_000;

/**
 * @dev Reward paid to referrers when a sale is made.
 * Set to 1% of the sale amount. This 1% is deducted from the protocol fee.
 */
uint96 constant BUY_REFERRER_IN_BASIS_POINTS = 100;

/**
 * @dev 10%, expressed as a denominator for more efficient calculations.
 */
uint256 constant ROYALTY_RATIO = BASIS_POINTS / ROYALTY_IN_BASIS_POINTS;

/**
 * @dev 1%, expressed as a denominator for more efficient calculations.
 */
uint256 constant BUY_REFERRER_RATIO = BASIS_POINTS / BUY_REFERRER_IN_BASIS_POINTS;

////////////////////////////////////////////////////////////////
// Gas Limits
////////////////////////////////////////////////////////////////

/**
 * @dev The gas limit used when making external read-only calls.
 * This helps to ensure that external calls does not prevent the market from executing.
 */
uint256 constant READ_ONLY_GAS_LIMIT = 40_000;

/**
 * @dev The gas limit to send ETH to multiple recipients, enough for a 5-way split.
 */
uint256 constant SEND_VALUE_GAS_LIMIT_MULTIPLE_RECIPIENTS = 210_000;

/**
 * @dev The gas limit to send ETH to a single recipient, enough for a contract with a simple receiver.
 */
uint256 constant SEND_VALUE_GAS_LIMIT_SINGLE_RECIPIENT = 20_000;

////////////////////////////////////////////////////////////////
// Collection Type Names
////////////////////////////////////////////////////////////////

/**
 * @dev The NFT collection type.
 */
string constant NFT_COLLECTION_TYPE = "NFT Collection";

/**
 * @dev The NFT drop collection type.
 */
string constant NFT_DROP_COLLECTION_TYPE = "NFT Drop Collection";

/**
 * @dev The NFT edition collection type.
 */
string constant NFT_TIMED_EDITION_COLLECTION_TYPE = "NFT Timed Edition Collection";

////////////////////////////////////////////////////////////////
// Business Logic
////////////////////////////////////////////////////////////////

/**
 * @dev Limits scheduled start/end times to be less than 2 years in the future.
 */
uint256 constant MAX_SCHEDULED_TIME_IN_THE_FUTURE = 365 days * 2;

/**
 * @dev The minimum increase of 10% required when making an offer or placing a bid.
 */
uint256 constant MIN_PERCENT_INCREMENT_DENOMINATOR = BASIS_POINTS / 1_000;

/**
 * @dev Protocol fee for edition mints in basis points.
 */
uint256 constant EDITION_PROTOCOL_FEE_IN_BASIS_POINTS = 500;

/**
 * @dev Hash of the edition type name.
 * This is precalculated in order to save gas on use.
 * `keccak256(abi.encodePacked(NFT_TIMED_EDITION_COLLECTION_TYPE))`
 */
bytes32 constant editionTypeHash = 0xee2afa3f960e108aca17013728aafa363a0f4485661d9b6f41c6b4ddb55008ee;

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

import "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol";

import "../../interfaces/internal/IFethMarket.sol";

error FETHNode_FETH_Address_Is_Not_A_Contract();
error FETHNode_Only_FETH_Can_Transfer_ETH();

/**
 * @title A mixin for interacting with the FETH contract.
 * @author batu-inal & HardlyDifficult
 */
abstract contract FETHNode is ContextUpgradeable {
  using AddressUpgradeable for address;
  using AddressUpgradeable for address payable;

  /// @notice The FETH ERC-20 token for managing escrow and lockup.
  IFethMarket internal immutable feth;

  constructor(address _feth) {
    if (!_feth.isContract()) {
      revert FETHNode_FETH_Address_Is_Not_A_Contract();
    }

    feth = IFethMarket(_feth);
  }

  /**
   * @notice Only used by FETH. Any direct transfer from users will revert.
   */
  receive() external payable {
    if (msg.sender != address(feth)) {
      revert FETHNode_Only_FETH_Can_Transfer_ETH();
    }
  }

  /**
   * @notice Withdraw the msg.sender's available FETH balance if they requested more than the msg.value provided.
   * @dev This may revert if the msg.sender is non-receivable.
   * This helper should not be used anywhere that may lead to locked assets.
   * @param totalAmount The total amount of ETH required (including the msg.value).
   * @param shouldRefundSurplus If true, refund msg.value - totalAmount to the msg.sender.
   */
  function _tryUseFETHBalance(uint256 totalAmount, bool shouldRefundSurplus) internal {
    if (totalAmount > msg.value) {
      // Withdraw additional ETH required from the user's available FETH balance.
      unchecked {
        // The if above ensures delta will not underflow.
        // Withdraw ETH from the user's account in the FETH token contract,
        // making the funds available in this contract as ETH.
        feth.marketWithdrawFrom(_msgSender(), totalAmount - msg.value);
      }
    } else if (shouldRefundSurplus && totalAmount < msg.value) {
      // Return any surplus ETH to the user.
      unchecked {
        // The if above ensures this will not underflow
        payable(_msgSender()).sendValue(msg.value - totalAmount);
      }
    }
  }

  /**
   * @notice Gets the FETH contract used to escrow offer funds.
   * @return fethAddress The FETH contract address.
   */
  function getFethAddress() external view returns (address fethAddress) {
    fethAddress = address(feth);
  }
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol";

import "../../interfaces/internal/roles/IAdminRole.sol";
import "../../interfaces/internal/roles/IOperatorRole.sol";

error FoundationTreasuryNode_Address_Is_Not_A_Contract();
error FoundationTreasuryNode_Caller_Not_Admin();
error FoundationTreasuryNode_Caller_Not_Operator();

/**
 * @title A mixin that stores a reference to the Foundation treasury contract.
 * @notice The treasury collects fees and defines admin/operator roles.
 * @author batu-inal & HardlyDifficult
 */
abstract contract FoundationTreasuryNode is Initializable {
  using AddressUpgradeable for address payable;

  /// @dev This value was replaced with an immutable version.
  address payable private __gap_was_treasury;

  /// @notice The address of the treasury contract.
  address payable private immutable treasury;

  /// @notice Requires the caller is a Foundation admin.
  modifier onlyFoundationAdmin() {
    if (!IAdminRole(treasury).isAdmin(msg.sender)) {
      revert FoundationTreasuryNode_Caller_Not_Admin();
    }
    _;
  }

  /// @notice Requires the caller is a Foundation operator.
  modifier onlyFoundationOperator() {
    if (!IOperatorRole(treasury).isOperator(msg.sender)) {
      revert FoundationTreasuryNode_Caller_Not_Operator();
    }
    _;
  }

  /**
   * @notice Set immutable variables for the implementation contract.
   * @dev Assigns the treasury contract address.
   */
  constructor(address payable _treasury) {
    if (!_treasury.isContract()) {
      revert FoundationTreasuryNode_Address_Is_Not_A_Contract();
    }
    treasury = _treasury;
  }

  /**
   * @notice Gets the Foundation treasury contract.
   * @dev This call is used in the royalty registry contract.
   * @return treasuryAddress The address of the Foundation treasury contract.
   */
  function getFoundationTreasury() public view returns (address payable treasuryAddress) {
    treasuryAddress = treasury;
  }

  /**
   * @notice This empty reserved space is put in place to allow future versions to add new
   * variables without shifting down storage in the inheritance chain.
   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
   */
  uint256[2_000] private __gap;
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

import "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol";
import "@openzeppelin/contracts/utils/introspection/ERC165Checker.sol";
import "@manifoldxyz/royalty-registry-solidity/contracts/IRoyaltyRegistry.sol";

import "../../interfaces/internal/INFTCollectionType.sol";
import "../../interfaces/standards/royalties/IGetFees.sol";
import "../../interfaces/standards/royalties/IGetRoyalties.sol";
import "../../interfaces/standards/royalties/IOwnable.sol";
import "../../interfaces/standards/royalties/IRoyaltyInfo.sol";
import "../../interfaces/standards/royalties/ITokenCreator.sol";

import "../../libraries/ArrayLibrary.sol";

import "./Constants.sol";
import "./FoundationTreasuryNode.sol";
import "./SendValueWithFallbackWithdraw.sol";
import "./MarketSharedCore.sol";

error NFTMarketFees_Royalty_Registry_Is_Not_A_Contract();
error NFTMarketFees_Invalid_Protocol_Fee();

/**
 * @title A mixin to distribute funds when an NFT is sold.
 * @author batu-inal & HardlyDifficult
 */
abstract contract MarketFees is
  FoundationTreasuryNode,
  ContextUpgradeable,
  MarketSharedCore,
  SendValueWithFallbackWithdraw
{
  using AddressUpgradeable for address;
  using ArrayLibrary for address payable[];
  using ArrayLibrary for uint256[];
  using ERC165Checker for address;

  /**
   * @dev Removing old unused variables in an upgrade safe way. Was:
   * uint256 private _primaryFoundationFeeBasisPoints;
   * uint256 private _secondaryFoundationFeeBasisPoints;
   * uint256 private _secondaryCreatorFeeBasisPoints;
   * mapping(address => mapping(uint256 => bool)) private _nftContractToTokenIdToFirstSaleCompleted;
   */
  uint256[4] private __gap_was_fees;

  /// @notice The fee collected by Foundation for sales facilitated by this market contract.
  uint256 private immutable DEFAULT_PROTOCOL_FEE_IN_BASIS_POINTS;

  /// @notice The address of the royalty registry which may be used to define royalty overrides for some collections.
  IRoyaltyRegistry private immutable royaltyRegistry;

  /// @notice The address of this contract's implementation.
  /// @dev This is used when making stateless external calls to this contract,
  /// saving gas over hopping through the proxy which is only necessary when accessing state.
  MarketFees private immutable implementationAddress;

  /// @notice True for the Drop market which only performs primary sales. False if primary & secondary are supported.
  bool private immutable assumePrimarySale;

  /**
   * @notice Emitted when an NFT sold with a referrer.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @param buyReferrer The account which received the buy referral incentive.
   * @param buyReferrerFee The portion of the protocol fee collected by the buy referrer.
   * @param buyReferrerSellerFee The portion of the owner revenue collected by the buy referrer (not implemented).
   */
  event BuyReferralPaid(
    address indexed nftContract,
    uint256 indexed tokenId,
    address buyReferrer,
    uint256 buyReferrerFee,
    uint256 buyReferrerSellerFee
  );

  /**
   * @notice Emitted when an NFT is sold when associated with a sell referrer.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @param sellerReferrer The account which received the sell referral incentive.
   * @param sellerReferrerFee The portion of the seller revenue collected by the sell referrer.
   */
  event SellerReferralPaid(
    address indexed nftContract,
    uint256 indexed tokenId,
    address sellerReferrer,
    uint256 sellerReferrerFee
  );

  /**
   * @notice Configures the registry allowing for royalty overrides to be defined.
   * @param _royaltyRegistry The registry to use for royalty overrides.
   * @param _assumePrimarySale True for the Drop market which only performs primary sales.
   * False if primary & secondary are supported.
   */
  constructor(uint16 protocolFeeInBasisPoints, address _royaltyRegistry, bool _assumePrimarySale) {
    if (
      protocolFeeInBasisPoints < BASIS_POINTS / BUY_REFERRER_RATIO ||
      protocolFeeInBasisPoints + BASIS_POINTS / ROYALTY_RATIO >= BASIS_POINTS - MAX_EXHIBITION_TAKE_RATE
    ) {
      /* If the protocol fee is invalid, revert:
       * Protocol fee must be greater than the buy referrer fee since referrer fees are deducted from the protocol fee.
       * The protocol fee must leave room for the creator royalties and the max exhibition take rate.
       */
      revert NFTMarketFees_Invalid_Protocol_Fee();
    }
    DEFAULT_PROTOCOL_FEE_IN_BASIS_POINTS = protocolFeeInBasisPoints;

    if (!_royaltyRegistry.isContract()) {
      // Not using a 165 check since mainnet and goerli are not using the same versions of the registry.
      revert NFTMarketFees_Royalty_Registry_Is_Not_A_Contract();
    }
    royaltyRegistry = IRoyaltyRegistry(_royaltyRegistry);

    assumePrimarySale = _assumePrimarySale;

    // In the constructor, `this` refers to the implementation address. Everywhere else it'll be the proxy.
    implementationAddress = this;
  }

  /**
   * @notice Distributes funds to foundation, creator recipients, and NFT owner after a sale.
   */
  function _distributeFunds(
    address nftContract,
    uint256 tokenId,
    address payable seller,
    uint256 price,
    address payable buyReferrer,
    address payable sellerReferrerPaymentAddress,
    uint16 sellerReferrerTakeRateInBasisPoints
  ) internal returns (uint256 totalFees, uint256 creatorRev, uint256 sellerRev) {
    if (price == 0) {
      // When the sale price is 0, there are no revenue to distribute.
      return (0, 0, 0);
    }

    address payable[] memory creatorRecipients;
    uint256[] memory creatorShares;

    uint256 buyReferrerFee;
    uint256 sellerReferrerFee;
    (totalFees, creatorRecipients, creatorShares, sellerRev, buyReferrerFee, sellerReferrerFee) = getFees(
      nftContract,
      tokenId,
      seller,
      price,
      buyReferrer,
      sellerReferrerTakeRateInBasisPoints
    );

    // Pay the creator(s)
    // If just a single recipient was defined, use a larger gas limit in order to support in-contract split logic.
    uint256 creatorGasLimit = creatorRecipients.length == 1
      ? SEND_VALUE_GAS_LIMIT_MULTIPLE_RECIPIENTS
      : SEND_VALUE_GAS_LIMIT_SINGLE_RECIPIENT;
    unchecked {
      for (uint256 i = 0; i < creatorRecipients.length; ++i) {
        _sendValueWithFallbackWithdraw(creatorRecipients[i], creatorShares[i], creatorGasLimit);
        // Sum the total creator rev from shares
        // creatorShares is in ETH so creatorRev will not overflow here.
        creatorRev += creatorShares[i];
      }
    }

    // Pay the seller
    _sendValueWithFallbackWithdraw(seller, sellerRev, SEND_VALUE_GAS_LIMIT_SINGLE_RECIPIENT);

    // Pay the protocol fee
    _sendValueWithFallbackWithdraw(getFoundationTreasury(), totalFees, SEND_VALUE_GAS_LIMIT_SINGLE_RECIPIENT);

    // Pay the buy referrer fee
    if (buyReferrerFee != 0) {
      _sendValueWithFallbackWithdraw(buyReferrer, buyReferrerFee, SEND_VALUE_GAS_LIMIT_SINGLE_RECIPIENT);
      emit BuyReferralPaid({
        nftContract: nftContract,
        tokenId: tokenId,
        buyReferrer: buyReferrer,
        buyReferrerFee: buyReferrerFee,
        buyReferrerSellerFee: 0
      });
      unchecked {
        // Add the referrer fee back into the total fees so that all 3 return fields sum to the total price for events
        totalFees += buyReferrerFee;
      }
    }

    if (sellerReferrerPaymentAddress != address(0)) {
      if (sellerReferrerFee != 0) {
        // Add the seller referrer fee back to revenue so that all 3 return fields sum to the total price for events.
        unchecked {
          if (sellerRev == 0) {
            // When sellerRev is 0, this is a primary sale and all revenue is attributed to the "creator".
            creatorRev += sellerReferrerFee;
          } else {
            sellerRev += sellerReferrerFee;
          }
        }

        _sendValueWithFallbackWithdraw(
          sellerReferrerPaymentAddress,
          sellerReferrerFee,
          SEND_VALUE_GAS_LIMIT_SINGLE_RECIPIENT
        );
      }

      emit SellerReferralPaid(nftContract, tokenId, sellerReferrerPaymentAddress, sellerReferrerFee);
    }
  }

  /**
   * @notice Returns how funds will be distributed for a sale at the given price point.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @param price The sale price to calculate the fees for.
   * @return totalFees How much will be sent to the Foundation treasury and/or referrals.
   * @return creatorRev How much will be sent across all the `creatorRecipients` defined.
   * @return creatorRecipients The addresses of the recipients to receive a portion of the creator fee.
   * @return creatorShares The percentage of the creator fee to be distributed to each `creatorRecipient`.
   * If there is only one `creatorRecipient`, this may be an empty array.
   * Otherwise `creatorShares.length` == `creatorRecipients.length`.
   * @return sellerRev How much will be sent to the owner/seller of the NFT.
   * If the NFT is being sold by the creator, this may be 0 and the full revenue will appear as `creatorRev`.
   * @return seller The address of the owner of the NFT.
   * If `sellerRev` is 0, this may be `address(0)`.
   * @dev Currently in use by the FNDMiddleware `getFees` call (now deprecated).
   */
  function getFeesAndRecipients(
    address nftContract,
    uint256 tokenId,
    uint256 price
  )
    external
    view
    returns (
      uint256 totalFees,
      uint256 creatorRev,
      address payable[] memory creatorRecipients,
      uint256[] memory creatorShares,
      uint256 sellerRev,
      address payable seller
    )
  {
    seller = _getSellerOrOwnerOf(nftContract, tokenId);
    (totalFees, creatorRecipients, creatorShares, sellerRev, , ) = getFees({
      nftContract: nftContract,
      tokenId: tokenId,
      seller: seller,
      price: price,
      // Notice: Setting this value is a breaking change for the FNDMiddleware contract.
      // Will be wired in an upcoming release to communicate the buy referral information.
      buyReferrer: payable(0),
      exhibitionTakeRateInBasisPoints: 0
    });

    // Sum the total creator rev from shares
    unchecked {
      for (uint256 i = 0; i < creatorShares.length; ++i) {
        creatorRev += creatorShares[i];
      }
    }
  }

  /**
   * @notice Returns the address of the registry allowing for royalty configuration overrides.
   * @dev See https://royaltyregistry.xyz/
   * @return registry The address of the royalty registry contract.
   */
  function getRoyaltyRegistry() external view returns (address registry) {
    registry = address(royaltyRegistry);
  }

  /**
   * @notice **For internal use only.**
   * @dev This function is external to allow using try/catch but is not intended for external use.
   * This checks the token creator.
   */
  function internalGetTokenCreator(
    address nftContract,
    uint256 tokenId
  ) external view returns (address payable creator) {
    creator = ITokenCreator(nftContract).tokenCreator{ gas: READ_ONLY_GAS_LIMIT }(tokenId);
  }

  /**
   * @notice **For internal use only.**
   * @dev This function is external to allow using try/catch but is not intended for external use.
   * If ERC2981 royalties (or getRoyalties) are defined by the NFT contract, allow this standard to define immutable
   * royalties that cannot be later changed via the royalty registry.
   */
  function internalGetImmutableRoyalties(
    address nftContract,
    uint256 tokenId
  ) external view returns (address payable[] memory recipients, uint256[] memory splitPerRecipientInBasisPoints) {
    // 1st priority: ERC-2981
    if (nftContract.supportsERC165InterfaceUnchecked(type(IRoyaltyInfo).interfaceId)) {
      try IRoyaltyInfo(nftContract).royaltyInfo{ gas: READ_ONLY_GAS_LIMIT }(tokenId, BASIS_POINTS) returns (
        address receiver,
        uint256 royaltyAmount
      ) {
        // Manifold contracts return (address(this), 0) when royalties are not defined
        // - so ignore results when the amount is 0
        if (royaltyAmount > 0) {
          recipients = new address payable[](1);
          recipients[0] = payable(receiver);
          splitPerRecipientInBasisPoints = new uint256[](1);
          // The split amount is assumed to be 100% when only 1 recipient is returned
          return (recipients, splitPerRecipientInBasisPoints);
        }
      } catch {
        // Fall through
      }
    }

    // 2nd priority: getRoyalties
    if (nftContract.supportsERC165InterfaceUnchecked(type(IGetRoyalties).interfaceId)) {
      try IGetRoyalties(nftContract).getRoyalties{ gas: READ_ONLY_GAS_LIMIT }(tokenId) returns (
        address payable[] memory _recipients,
        uint256[] memory recipientBasisPoints
      ) {
        if (_recipients.length != 0 && _recipients.length == recipientBasisPoints.length) {
          return (_recipients, recipientBasisPoints);
        }
      } catch {
        // Fall through
      }
    }
  }

  /**
   * @notice **For internal use only.**
   * @dev This function is external to allow using try/catch but is not intended for external use.
   * This checks for royalties defined in the royalty registry or via a non-standard royalty API.
   */
  function internalGetMutableRoyalties(
    address nftContract,
    uint256 tokenId,
    address payable creator
  ) external view returns (address payable[] memory recipients, uint256[] memory splitPerRecipientInBasisPoints) {
    /* Overrides must support ERC-165 when registered, except for overrides defined by the registry owner.
       If that results in an override w/o 165 we may need to upgrade the market to support or ignore that override. */
    // The registry requires overrides are not 0 and contracts when set.
    // If no override is set, the nftContract address is returned.

    try royaltyRegistry.getRoyaltyLookupAddress{ gas: READ_ONLY_GAS_LIMIT }(nftContract) returns (
      address overrideContract
    ) {
      if (overrideContract != nftContract) {
        nftContract = overrideContract;

        // The functions above are repeated here if an override is set.

        // 3rd priority: ERC-2981 override
        if (nftContract.supportsERC165InterfaceUnchecked(type(IRoyaltyInfo).interfaceId)) {
          try IRoyaltyInfo(nftContract).royaltyInfo{ gas: READ_ONLY_GAS_LIMIT }(tokenId, BASIS_POINTS) returns (
            address receiver,
            uint256 royaltyAmount
          ) {
            // Manifold contracts return (address(this), 0) when royalties are not defined
            // - so ignore results when the amount is 0
            if (royaltyAmount != 0) {
              recipients = new address payable[](1);
              recipients[0] = payable(receiver);
              splitPerRecipientInBasisPoints = new uint256[](1);
              // The split amount is assumed to be 100% when only 1 recipient is returned
              return (recipients, splitPerRecipientInBasisPoints);
            }
          } catch {
            // Fall through
          }
        }

        // 4th priority: getRoyalties override
        if (recipients.length == 0 && nftContract.supportsERC165InterfaceUnchecked(type(IGetRoyalties).interfaceId)) {
          try IGetRoyalties(nftContract).getRoyalties{ gas: READ_ONLY_GAS_LIMIT }(tokenId) returns (
            address payable[] memory _recipients,
            uint256[] memory recipientBasisPoints
          ) {
            if (_recipients.length != 0 && _recipients.length == recipientBasisPoints.length) {
              return (_recipients, recipientBasisPoints);
            }
          } catch {
            // Fall through
          }
        }
      }
    } catch {
      // Ignore out of gas errors and continue using the nftContract address
    }

    // 5th priority: getFee* from contract or override
    if (nftContract.supportsERC165InterfaceUnchecked(type(IGetFees).interfaceId)) {
      try IGetFees(nftContract).getFeeRecipients{ gas: READ_ONLY_GAS_LIMIT }(tokenId) returns (
        address payable[] memory _recipients
      ) {
        if (_recipients.length != 0) {
          try IGetFees(nftContract).getFeeBps{ gas: READ_ONLY_GAS_LIMIT }(tokenId) returns (
            uint256[] memory recipientBasisPoints
          ) {
            if (_recipients.length == recipientBasisPoints.length) {
              return (_recipients, recipientBasisPoints);
            }
          } catch {
            // Fall through
          }
        }
      } catch {
        // Fall through
      }
    }

    // 6th priority: tokenCreator w/ or w/o requiring 165 from contract or override
    if (creator != address(0)) {
      // Only pay the tokenCreator if there wasn't another royalty defined
      recipients = new address payable[](1);
      recipients[0] = creator;
      splitPerRecipientInBasisPoints = new uint256[](1);
      // The split amount is assumed to be 100% when only 1 recipient is returned
      return (recipients, splitPerRecipientInBasisPoints);
    }

    // 7th priority: owner from contract or override
    try IOwnable(nftContract).owner{ gas: READ_ONLY_GAS_LIMIT }() returns (address owner) {
      if (owner != address(0)) {
        // Only pay the owner if there wasn't another royalty defined
        recipients = new address payable[](1);
        recipients[0] = payable(owner);
        splitPerRecipientInBasisPoints = new uint256[](1);
        // The split amount is assumed to be 100% when only 1 recipient is returned
        return (recipients, splitPerRecipientInBasisPoints);
      }
    } catch {
      // Fall through
    }

    // If no valid payment address or creator is found, return 0 recipients
  }

  /**
   * @notice Calculates how funds should be distributed for the given sale details.
   * @dev When the NFT is being sold by the `tokenCreator`, all the seller revenue will
   * be split with the royalty recipients defined for that NFT.
   */
  function getFees(
    address nftContract,
    uint256 tokenId,
    address payable seller,
    uint256 price,
    address payable buyReferrer,
    uint16 exhibitionTakeRateInBasisPoints
  )
    public
    view
    returns (
      uint256 totalFees,
      address payable[] memory creatorRecipients,
      uint256[] memory creatorShares,
      uint256 sellerRev,
      uint256 buyReferrerFee,
      uint256 sellerReferrerFee
    )
  {
    // Calculate the protocol fee
    totalFees = (price * _getProtocolFee(nftContract)) / BASIS_POINTS;

    address payable creator;
    try implementationAddress.internalGetTokenCreator(nftContract, tokenId) returns (address payable _creator) {
      creator = _creator;
    } catch {
      // Fall through
    }

    try implementationAddress.internalGetImmutableRoyalties(nftContract, tokenId) returns (
      address payable[] memory _recipients,
      uint256[] memory _splitPerRecipientInBasisPoints
    ) {
      (creatorRecipients, creatorShares) = (_recipients, _splitPerRecipientInBasisPoints);
    } catch {
      // Fall through
    }

    if (creatorRecipients.length == 0) {
      // Check mutable royalties only if we didn't find results from the immutable API
      try implementationAddress.internalGetMutableRoyalties(nftContract, tokenId, creator) returns (
        address payable[] memory _recipients,
        uint256[] memory _splitPerRecipientInBasisPoints
      ) {
        (creatorRecipients, creatorShares) = (_recipients, _splitPerRecipientInBasisPoints);
      } catch {
        // Fall through
      }
    }

    if (creatorRecipients.length != 0 || assumePrimarySale) {
      uint256 creatorRev;
      if (assumePrimarySale) {
        // All revenue should go to the creator recipients
        unchecked {
          // totalFees is always < price.
          creatorRev = price - totalFees;
        }
        if (creatorRecipients.length == 0) {
          // If no creators were found via the royalty APIs, then set that recipient to the seller's address
          creatorRecipients = new address payable[](1);
          creatorRecipients[0] = seller;
          creatorShares = new uint256[](1);
          // The split amount is assumed to be 100% when only 1 recipient is returned
        }
      } else if (seller == creator || (creatorRecipients.length != 0 && seller == creatorRecipients[0])) {
        // When sold by the creator, all revenue is split if applicable.
        unchecked {
          // totalFees is always < price.
          creatorRev = price - totalFees;
        }
      } else {
        // Rounding favors the owner first, then creator, and foundation last.
        unchecked {
          // Safe math is not required when dividing by a non-zero constant.
          creatorRev = price / ROYALTY_RATIO;
        }
        sellerRev = price - totalFees - creatorRev;
      }

      // Cap the max number of recipients supported
      creatorRecipients.capLength(MAX_ROYALTY_RECIPIENTS);
      creatorShares.capLength(MAX_ROYALTY_RECIPIENTS);

      // Calculate the seller referrer fee when some revenue is awarded to the creator
      if (exhibitionTakeRateInBasisPoints != 0) {
        sellerReferrerFee = (price * exhibitionTakeRateInBasisPoints) / BASIS_POINTS;

        // Subtract the seller referrer fee from the seller revenue so we do not double pay.
        if (sellerRev == 0) {
          // If the seller revenue is 0, this is a primary sale where all seller revenue is attributed to the "creator".
          creatorRev -= sellerReferrerFee;
        } else {
          sellerRev -= sellerReferrerFee;
        }
      }

      // Sum the total shares defined
      uint256 totalShares;
      if (creatorRecipients.length > 1) {
        unchecked {
          for (uint256 i = 0; i < creatorRecipients.length; ++i) {
            if (creatorRecipients[i] == seller) {
              // If the seller is any of the recipients defined, assume a primary sale
              creatorRev += sellerRev;
              sellerRev = 0;
            }
            if (totalShares != type(uint256).max) {
              if (creatorShares[i] > BASIS_POINTS) {
                // If the numbers are >100% we ignore the fee recipients and pay just the first instead
                totalShares = type(uint256).max;
                // Continue the loop in order to detect a potential primary sale condition
              } else {
                totalShares += creatorShares[i];
              }
            }
          }
        }

        if (totalShares == 0 || totalShares == type(uint256).max) {
          // If no shares were defined or shares were out of bounds, pay only the first recipient
          creatorRecipients.capLength(1);
          creatorShares.capLength(1);
        }
      }

      // Send payouts to each additional recipient if more than 1 was defined
      uint256 totalRoyaltiesDistributed;
      for (uint256 i = 1; i < creatorRecipients.length; ) {
        uint256 royalty = (creatorRev * creatorShares[i]) / totalShares;
        totalRoyaltiesDistributed += royalty;
        creatorShares[i] = royalty;
        unchecked {
          ++i;
        }
      }

      // Send the remainder to the 1st creator, rounding in their favor
      creatorShares[0] = creatorRev - totalRoyaltiesDistributed;
    } else {
      // No royalty recipients found.
      unchecked {
        // totalFees is always < price.
        sellerRev = price - totalFees;
      }

      // Calculate the seller referrer fee when there is no creator royalty
      if (exhibitionTakeRateInBasisPoints != 0) {
        sellerReferrerFee = (price * exhibitionTakeRateInBasisPoints) / BASIS_POINTS;

        sellerRev -= sellerReferrerFee;
      }
    }

    if (
      buyReferrer != address(0) &&
      buyReferrer != _msgSender() &&
      buyReferrer != seller &&
      buyReferrer != creator &&
      buyReferrer != address(feth)
    ) {
      unchecked {
        buyReferrerFee = price / BUY_REFERRER_RATIO;

        // buyReferrerFee is always <= totalFees
        totalFees -= buyReferrerFee;
      }
    }
  }

  /**
   * @notice Calculates the protocol fee for the given NFT contract.
   * @dev This returns the contract's default fee but may be overridden to change fees based on the collection type.
   */
  function _getProtocolFee(address /* nftContract */) internal view virtual returns (uint256 protocolFeeInBasisPoints) {
    protocolFeeInBasisPoints = DEFAULT_PROTOCOL_FEE_IN_BASIS_POINTS;
  }

  /**
   * @notice This empty reserved space is put in place to allow future versions to add new
   * variables without shifting down storage in the inheritance chain.
   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
   */
  uint256[500] private __gap;
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

import "./FETHNode.sol";

/**
 * @title A place for common modifiers and functions used by various market mixins, if any.
 * @dev This also leaves a gap which can be used to add a new mixin to the top of the inheritance tree.
 * @author batu-inal & HardlyDifficult
 */
abstract contract MarketSharedCore is FETHNode {
  /**
   * @notice Checks who the seller for an NFT is if listed in this market.
   * @param nftContract The address of the NFT contract.
   * @param tokenId The id of the NFT.
   * @return seller The seller which listed this NFT for sale, or address(0) if not listed.
   */
  function getSellerOf(address nftContract, uint256 tokenId) external view returns (address payable seller) {
    seller = _getSellerOf(nftContract, tokenId);
  }

  /**
   * @notice Checks who the seller for an NFT is if listed in this market.
   */
  function _getSellerOf(address nftContract, uint256 tokenId) internal view virtual returns (address payable seller) {
    // Returns address(0) by default.
  }

  /**
   * @notice Checks who the seller for an NFT is if listed in this market or returns the current owner.
   */
  function _getSellerOrOwnerOf(
    address nftContract,
    uint256 tokenId
  ) internal view virtual returns (address payable sellerOrOwner);

  /**
   * @notice This empty reserved space is put in place to allow future versions to add new
   * variables without shifting down storage in the inheritance chain.
   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
   */
  uint256[450] private __gap;
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

import "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol";

error RouterContext_Not_A_Contract();

/**
 * @title Enables a trusted router contract to override the usual msg.sender address.
 * @author HardlyDifficult
 */
abstract contract RouterContext is ContextUpgradeable {
  using AddressUpgradeable for address;

  address private immutable approvedRouter;

  constructor(address router) {
    if (!router.isContract()) {
      revert RouterContext_Not_A_Contract();
    }
    approvedRouter = router;
  }

  /**
   * @notice Returns the router contract which is able to override the msg.sender address.
   * @return router The address of the trusted router.
   */
  function getApprovedRouterAddress() external view returns (address router) {
    router = approvedRouter;
  }

  /**
   * @notice Returns the sender of the transaction.
   * @dev If the msg.sender is the trusted router contract, then the last 20 bytes of the calldata is the authorized
   * sender.
   */
  function _msgSender() internal view virtual override returns (address sender) {
    sender = super._msgSender();
    if (sender == approvedRouter) {
      assembly {
        // The router appends the msg.sender to the end of the calldata
        // source: https://github.com/opengsn/gsn/blob/v3.0.0-beta.3/packages/contracts/src/ERC2771Recipient.sol#L48
        sender := shr(96, calldataload(sub(calldatasize(), 20)))
      }
    }
  }
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.18;

import "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol";

import "./FETHNode.sol";
import "./FoundationTreasuryNode.sol";

/**
 * @title A mixin for sending ETH with a fallback withdraw mechanism.
 * @notice Attempt to send ETH and if the transfer fails or runs out of gas, store the balance
 * in the FETH token contract for future withdrawal instead.
 * @dev This mixin was recently switched to escrow funds in FETH.
 * Once we have confirmed all pending balances have been withdrawn, we can remove the escrow tracking here.
 * @author batu-inal & HardlyDifficult
 */
abstract contract SendValueWithFallbackWithdraw is FoundationTreasuryNode, FETHNode {
  using AddressUpgradeable for address payable;

  /// @dev Removing old unused variables in an upgrade safe way.
  uint256 private __gap_was_pendingWithdrawals;

  /**
   * @notice Emitted when escrowed funds are withdrawn to FETH.
   * @param user The account which has withdrawn ETH.
   * @param amount The amount of ETH which has been withdrawn.
   */
  event WithdrawalToFETH(address indexed user, uint256 amount);

  /**
   * @notice Attempt to send a user or contract ETH.
   * If it fails store the amount owned for later withdrawal in FETH.
   * @dev This may fail when sending ETH to a contract that is non-receivable or exceeds the gas limit specified.
   */
  function _sendValueWithFallbackWithdraw(address payable user, uint256 amount, uint256 gasLimit) internal {
    if (amount == 0) {
      return;
    }

    if (user == address(feth)) {
      // FETH may revert on ETH transfers and will reject `depositFor` calls to itself, so redirect funds to the
      // treasury contract instead.
      user = getFoundationTreasury();
    }

    // Cap the gas to prevent consuming all available gas to block a tx from completing successfully
    // solhint-disable-next-line avoid-low-level-calls
    (bool success, ) = user.call{ value: amount, gas: gasLimit }("");
    if (!success) {
      // Store the funds that failed to send for the user in the FETH token
      feth.depositFor{ value: amount }(user);
      emit WithdrawalToFETH(user, amount);
    }
  }

  /**
   * @notice This empty reserved space is put in place to allow future versions to add new
   * variables without shifting down storage in the inheritance chain.
   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
   */
  uint256[999] private __gap;
}

{
  "optimizer": {
    "enabled": true,
    "runs": 3500
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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00000000000000000000000067df244584b67e8c51b10ad610aaffa9a402fdb600000000000000000000000049128cf8abe9071ee24540a296b5ded3f9d50443000000000000000000000000ad2184fb5dbcfc05d8f056542fb25b04fa32a95d0000000000000000000000000000000000000000000000000000000000015180000000000000000000000000762340b8a40cdd5bfc3edd94265899fda345d0e3

-----Decoded View---------------
Arg [0] : treasury (address): 0x67Df244584b67E8C51B10aD610aAfFa9a402FdB6
Arg [1] : feth (address): 0x49128CF8ABE9071ee24540a296b5DED3F9D50443
Arg [2] : royaltyRegistry (address): 0xaD2184FB5DBcfC05d8f056542fB25b04fa32A95D
Arg [3] : duration (uint256): 86400
Arg [4] : router (address): 0x762340B8a40Cdd5BFC3eDD94265899FDa345D0E3

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 00000000000000000000000067df244584b67e8c51b10ad610aaffa9a402fdb6
Arg [1] : 00000000000000000000000049128cf8abe9071ee24540a296b5ded3f9d50443
Arg [2] : 000000000000000000000000ad2184fb5dbcfc05d8f056542fb25b04fa32a95d
Arg [3] : 0000000000000000000000000000000000000000000000000000000000015180
Arg [4] : 000000000000000000000000762340b8a40cdd5bfc3edd94265899fda345d0e3