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// SPDX-License-Identifier: MIT
// moved from https://github.com/museum-of-war/auction
pragma solidity 0.8.13;

import "IERC721.sol";
import "IERC721Receiver.sol";
import "IERC20.sol";
import "Ownable.sol";
import "IWithBalance.sol";

/// @title An Auction Contract for bidding and selling single and batched NFTs
/// @author Avo Labs GmbH
/// @notice This contract can be used for auctioning any NFTs, and accepts any ERC20 token as payment
contract NFTAuction is Ownable {
    address[] public whitelistedPassCollections; //Only owners of tokens from any of these collections can make bids
    mapping(address => mapping(uint256 => Auction)) public nftContractAuctions;
    mapping(address => uint256) failedTransferCredits;
    //Each Auction is unique to each NFT (contract + id pairing).
    struct Auction {
        //map token ID to
        uint32 bidIncreasePercentage;
        uint32 auctionBidPeriod; //Increments the length of time the auction is open in which a new bid can be made after each bid.
        uint64 auctionEnd;
        uint128 minPrice;
        uint128 buyNowPrice;
        uint128 nftHighestBid;
        address nftHighestBidder;
        address nftSeller;
        address whitelistedBuyer; //The seller can specify a whitelisted address for a sale (this is effectively a direct sale).
        address nftRecipient; //The bidder can specify a recipient for the NFT if their bid is successful.
        address ERC20Token; // The seller can specify an ERC20 token that can be used to bid or purchase the NFT.
        address[] feeRecipients;
        uint32[] feePercentages;
    }
    /*
     * Default values that are used if not specified by the NFT seller.
     */
    uint32 public defaultBidIncreasePercentage;
    uint32 public minimumSettableIncreasePercentage;
    uint32 public maximumMinPricePercentage;
    uint32 public defaultAuctionBidPeriod;

    /*╔═════════════════════════════╗
      ║           EVENTS            ║
      ╚═════════════════════════════╝*/

    event NftAuctionCreated(
        address nftContractAddress,
        uint256 tokenId,
        address nftSeller,
        address erc20Token,
        uint128 minPrice,
        uint128 buyNowPrice,
        uint32 auctionBidPeriod,
        uint32 bidIncreasePercentage,
        address[] feeRecipients,
        uint32[] feePercentages
    );

    event SaleCreated(
        address nftContractAddress,
        uint256 tokenId,
        address nftSeller,
        address erc20Token,
        uint128 buyNowPrice,
        address whitelistedBuyer,
        address[] feeRecipients,
        uint32[] feePercentages
    );

    event BidMade(
        address nftContractAddress,
        uint256 tokenId,
        address bidder,
        uint256 ethAmount,
        address erc20Token,
        uint256 tokenAmount
    );

    event AuctionPeriodUpdated(
        address nftContractAddress,
        uint256 tokenId,
        uint64 auctionEndPeriod
    );

    event NFTTransferredAndSellerPaid(
        address nftContractAddress,
        uint256 tokenId,
        address nftSeller,
        uint128 nftHighestBid,
        address nftHighestBidder,
        address nftRecipient
    );

    event AuctionSettled(
        address nftContractAddress,
        uint256 tokenId,
        address auctionSettler
    );

    event AuctionWithdrawn(
        address nftContractAddress,
        uint256 tokenId,
        address nftOwner
    );

    event BidWithdrawn(
        address nftContractAddress,
        uint256 tokenId,
        address highestBidder
    );

    event WhitelistedBuyerUpdated(
        address nftContractAddress,
        uint256 tokenId,
        address newWhitelistedBuyer
    );

    event MinimumPriceUpdated(
        address nftContractAddress,
        uint256 tokenId,
        uint256 newMinPrice
    );

    event BuyNowPriceUpdated(
        address nftContractAddress,
        uint256 tokenId,
        uint128 newBuyNowPrice
    );
    event HighestBidTaken(address nftContractAddress, uint256 tokenId);
    /**********************************/
    /*╔═════════════════════════════╗
      ║             END             ║
      ║            EVENTS           ║
      ╚═════════════════════════════╝*/
    /**********************************/
    /*╔═════════════════════════════╗
      ║          MODIFIERS          ║
      ╚═════════════════════════════╝*/

    modifier hasWhitelistedToken() {
        { //Block scoping to prevent "Stack too deep"
            bool isWhitelisted;
            for (uint256 i = 0; i < whitelistedPassCollections.length; i++) {
                if(IWithBalance(whitelistedPassCollections[i]).balanceOf(msg.sender) > 0) {
                    isWhitelisted = true;
                    break;
                }
            }
            require(isWhitelisted, "Sender has no whitelisted NFTs");
        }
        _;
    }

    modifier isAuctionNotStartedByOwner(
        address _nftContractAddress,
        uint256 _tokenId
    ) {
        require(
            nftContractAuctions[_nftContractAddress][_tokenId].nftSeller !=
                msg.sender,
            "Auction already started by owner"
        );

        if (
            nftContractAuctions[_nftContractAddress][_tokenId].nftSeller !=
            address(0)
        ) {
            require(
                msg.sender == IERC721(_nftContractAddress).ownerOf(_tokenId),
                "Sender doesn't own NFT"
            );

            _resetAuction(_nftContractAddress, _tokenId);
        }
        _;
    }

    modifier auctionOngoing(address _nftContractAddress, uint256 _tokenId) {
        require(
            _isAuctionOngoing(_nftContractAddress, _tokenId),
            "Auction has ended"
        );
        _;
    }

    modifier priceGreaterThanZero(uint256 _price) {
        require(_price > 0, "Price cannot be 0");
        _;
    }
    /*
     * The minimum price must be 80% of the buyNowPrice(if set).
     */
    modifier minPriceDoesNotExceedLimit(
        uint128 _buyNowPrice,
        uint128 _minPrice
    ) {
        require(
            _buyNowPrice == 0 ||
                _getPortionOfBid(_buyNowPrice, maximumMinPricePercentage) >=
                _minPrice,
            "MinPrice > 80% of buyNowPrice"
        );
        _;
    }

    modifier notNftSeller(address _nftContractAddress, uint256 _tokenId) {
        require(
            msg.sender !=
                nftContractAuctions[_nftContractAddress][_tokenId].nftSeller,
            "Owner cannot bid on own NFT"
        );
        _;
    }
    modifier onlyNftSeller(address _nftContractAddress, uint256 _tokenId) {
        require(
            msg.sender ==
                nftContractAuctions[_nftContractAddress][_tokenId].nftSeller,
            "Only nft seller"
        );
        _;
    }
    /*
     * The bid amount was either equal the buyNowPrice or it must be higher than the previous
     * bid by the specified bid increase percentage.
     */
    modifier bidAmountMeetsBidRequirements(
        address _nftContractAddress,
        uint256 _tokenId,
        uint128 _tokenAmount
    ) {
        require(
            _doesBidMeetBidRequirements(
                _nftContractAddress,
                _tokenId,
                _tokenAmount
            ),
            "Not enough funds to bid on NFT"
        );
        _;
    }
    // check if the highest bidder can purchase this NFT.
    modifier onlyApplicableBuyer(
        address _nftContractAddress,
        uint256 _tokenId
    ) {
        require(
            !_isWhitelistedSale(_nftContractAddress, _tokenId) ||
                nftContractAuctions[_nftContractAddress][_tokenId]
                    .whitelistedBuyer ==
                msg.sender,
            "Only the whitelisted buyer"
        );
        _;
    }

    modifier minimumBidNotMade(address _nftContractAddress, uint256 _tokenId) {
        require(
            !_isMinimumBidMade(_nftContractAddress, _tokenId),
            "The auction has a valid bid made"
        );
        _;
    }

    /*
     * Payment is accepted if the payment is made in the ERC20 token or ETH specified by the seller.
     * Early bids on NFTs not yet up for auction must be made in ETH.
     */
    modifier paymentAccepted(
        address _nftContractAddress,
        uint256 _tokenId,
        address _erc20Token,
        uint128 _tokenAmount
    ) {
        require(
            _isPaymentAccepted(
                _nftContractAddress,
                _tokenId,
                _erc20Token,
                _tokenAmount
            ),
            "Bid to be in specified ERC20/Eth"
        );
        _;
    }

    modifier isAuctionOver(address _nftContractAddress, uint256 _tokenId) {
        require(
            !_isAuctionOngoing(_nftContractAddress, _tokenId),
            "Auction is not yet over"
        );
        _;
    }

    modifier notZeroAddress(address _address) {
        require(_address != address(0), "Cannot specify 0 address");
        _;
    }

    modifier increasePercentageAboveMinimum(uint32 _bidIncreasePercentage) {
        require(
            _bidIncreasePercentage >= minimumSettableIncreasePercentage,
            "Bid increase percentage too low"
        );
        _;
    }

    modifier isFeePercentagesLessThanMaximum(uint32[] memory _feePercentages) {
        uint32 totalPercent;
        for (uint256 i = 0; i < _feePercentages.length; i++) {
            totalPercent = totalPercent + _feePercentages[i];
        }
        require(totalPercent <= 10000, "Fee percentages exceed maximum");
        _;
    }

    modifier correctFeeRecipientsAndPercentages(
        uint256 _recipientsLength,
        uint256 _percentagesLength
    ) {
        require(
            _recipientsLength == _percentagesLength,
            "Recipients != percentages"
        );
        _;
    }

    modifier isNotASale(address _nftContractAddress, uint256 _tokenId) {
        require(
            !_isASale(_nftContractAddress, _tokenId),
            "Not applicable for a sale"
        );
        _;
    }

    /**********************************/
    /*╔═════════════════════════════╗
      ║             END             ║
      ║          MODIFIERS          ║
      ╚═════════════════════════════╝*/
    /**********************************/
    // constructor
    constructor(address[] memory _whitelistedPassCollectionsAddresses) {
        defaultBidIncreasePercentage = 100;
        defaultAuctionBidPeriod = 86400; //1 day
        minimumSettableIncreasePercentage = 100;
        maximumMinPricePercentage = 8000;

        uint256 collectionsCount = _whitelistedPassCollectionsAddresses.length;
        for (uint256 i = 0; i < collectionsCount; i++) {
            whitelistedPassCollections.push(_whitelistedPassCollectionsAddresses[i]);
        }
    }
    /**********************************/
    /*╔══════════════════════════════╗
      ║     WHITELIST FUNCTIONS      ║
      ╚══════════════════════════════╝*/
    /*
     * Add whitelisted pass collection.
     */
    function addWhitelistedCollection(address _collectionContractAddress)
    external
    onlyOwner
    {
        whitelistedPassCollections.push(_collectionContractAddress);
    }
    /*
     * Remove whitelisted pass collection by index.
     */
    function removeWhitelistedCollection(uint256 index)
    external
    onlyOwner
    {
        whitelistedPassCollections[index] = whitelistedPassCollections[whitelistedPassCollections.length - 1];
        whitelistedPassCollections.pop();
    }
    /**********************************/
    /*╔══════════════════════════════╗
      ║             END              ║
      ║     WHITELIST FUNCTIONS      ║
      ╚══════════════════════════════╝*/
    /**********************************/
    /*╔══════════════════════════════╗
      ║    AUCTION CHECK FUNCTIONS   ║
      ╚══════════════════════════════╝*/
    function _isAuctionOngoing(address _nftContractAddress, uint256 _tokenId)
        internal
        view
        returns (bool)
    {
        uint64 auctionEndTimestamp = nftContractAuctions[_nftContractAddress][
            _tokenId
        ].auctionEnd;
        //if the auctionEnd is set to 0, the auction is technically on-going, however
        //the minimum bid price (minPrice) has not yet been met.
        return (auctionEndTimestamp == 0 ||
            block.timestamp < auctionEndTimestamp);
    }

    /*
     * Check if a bid has been made. This is applicable in the early bid scenario
     * to ensure that if an auction is created after an early bid, the auction
     * begins appropriately or is settled if the buy now price is met.
     */
    function _isABidMade(address _nftContractAddress, uint256 _tokenId)
        internal
        view
        returns (bool)
    {
        return (nftContractAuctions[_nftContractAddress][_tokenId]
            .nftHighestBid > 0);
    }

    /*
     *if the minPrice is set by the seller, check that the highest bid meets or exceeds that price.
     */
    function _isMinimumBidMade(address _nftContractAddress, uint256 _tokenId)
        internal
        view
        returns (bool)
    {
        uint128 minPrice = nftContractAuctions[_nftContractAddress][_tokenId]
            .minPrice;
        return
            minPrice > 0 &&
            (nftContractAuctions[_nftContractAddress][_tokenId].nftHighestBid >=
                minPrice);
    }

    /*
     * If the buy now price is set by the seller, check that the highest bid meets that price.
     */
    function _isBuyNowPriceMet(address _nftContractAddress, uint256 _tokenId)
        internal
        view
        returns (bool)
    {
        uint128 buyNowPrice = nftContractAuctions[_nftContractAddress][_tokenId]
            .buyNowPrice;
        return
            buyNowPrice > 0 &&
            nftContractAuctions[_nftContractAddress][_tokenId].nftHighestBid >=
            buyNowPrice;
    }

    /*
     * Check that a bid is applicable for the purchase of the NFT.
     * In the case of a sale: the bid needs to meet the buyNowPrice.
     * In the case of an auction: the bid needs to be a % higher than the previous bid.
     */
    function _doesBidMeetBidRequirements(
        address _nftContractAddress,
        uint256 _tokenId,
        uint128 _tokenAmount
    ) internal view returns (bool) {
        uint128 buyNowPrice = nftContractAuctions[_nftContractAddress][_tokenId]
            .buyNowPrice;
        //if buyNowPrice is met, ignore increase percentage
        if (
            buyNowPrice > 0 &&
            (msg.value >= buyNowPrice || _tokenAmount >= buyNowPrice)
        ) {
            return true;
        }
        //if the NFT is up for auction, the bid needs to be a % higher than the previous bid
        uint256 bidIncreaseAmount = (nftContractAuctions[_nftContractAddress][
            _tokenId
        ].nftHighestBid *
            (10000 +
                _getBidIncreasePercentage(_nftContractAddress, _tokenId))) /
            10000;
        return (msg.value >= bidIncreaseAmount ||
            _tokenAmount >= bidIncreaseAmount);
    }

    /*
     * An NFT is up for sale if the buyNowPrice is set, but the minPrice is not set.
     * Therefore the only way to conclude the NFT sale is to meet the buyNowPrice.
     */
    function _isASale(address _nftContractAddress, uint256 _tokenId)
        internal
        view
        returns (bool)
    {
        return (nftContractAuctions[_nftContractAddress][_tokenId].buyNowPrice >
            0 &&
            nftContractAuctions[_nftContractAddress][_tokenId].minPrice == 0);
    }

    function _isWhitelistedSale(address _nftContractAddress, uint256 _tokenId)
        internal
        view
        returns (bool)
    {
        return (nftContractAuctions[_nftContractAddress][_tokenId]
            .whitelistedBuyer != address(0));
    }

    /*
     * The highest bidder is allowed to purchase the NFT if
     * no whitelisted buyer is set by the NFT seller.
     * Otherwise, the highest bidder must equal the whitelisted buyer.
     */
    function _isHighestBidderAllowedToPurchaseNFT(
        address _nftContractAddress,
        uint256 _tokenId
    ) internal view returns (bool) {
        return
            (!_isWhitelistedSale(_nftContractAddress, _tokenId)) ||
            _isHighestBidderWhitelisted(_nftContractAddress, _tokenId);
    }

    function _isHighestBidderWhitelisted(
        address _nftContractAddress,
        uint256 _tokenId
    ) internal view returns (bool) {
        return (nftContractAuctions[_nftContractAddress][_tokenId]
            .nftHighestBidder ==
            nftContractAuctions[_nftContractAddress][_tokenId]
                .whitelistedBuyer);
    }

    /**
     * Payment is accepted in the following scenarios:
     * (1) Auction already created - can accept ETH or Specified Token
     *  --------> Cannot bid with ETH & an ERC20 Token together in any circumstance<------
     * (2) Auction not created - only ETH accepted (cannot early bid with an ERC20 Token
     * (3) Cannot make a zero bid (no ETH or Token amount)
     */
    function _isPaymentAccepted(
        address _nftContractAddress,
        uint256 _tokenId,
        address _bidERC20Token,
        uint128 _tokenAmount
    ) internal view returns (bool) {
        address auctionERC20Token = nftContractAuctions[_nftContractAddress][
            _tokenId
        ].ERC20Token;
        if (_isERC20Auction(auctionERC20Token)) {
            return
                msg.value == 0 &&
                auctionERC20Token == _bidERC20Token &&
                _tokenAmount > 0;
        } else {
            return
                msg.value != 0 &&
                _bidERC20Token == address(0) &&
                _tokenAmount == 0;
        }
    }

    function _isERC20Auction(address _auctionERC20Token)
        internal
        pure
        returns (bool)
    {
        return _auctionERC20Token != address(0);
    }

    /*
     * Returns the percentage of the total bid (used to calculate fee payments)
     */
    function _getPortionOfBid(uint256 _totalBid, uint256 _percentage)
        internal
        pure
        returns (uint256)
    {
        return (_totalBid * (_percentage)) / 10000;
    }

    /**********************************/
    /*╔══════════════════════════════╗
      ║             END              ║
      ║    AUCTION CHECK FUNCTIONS   ║
      ╚══════════════════════════════╝*/
    /**********************************/
    /*╔══════════════════════════════╗
      ║    DEFAULT GETTER FUNCTIONS  ║
      ╚══════════════════════════════╝*/
    /*****************************************************************
     * These functions check if the applicable auction parameter has *
     * been set by the NFT seller. If not, return the default value. *
     *****************************************************************/

    function _getBidIncreasePercentage(
        address _nftContractAddress,
        uint256 _tokenId
    ) internal view returns (uint32) {
        uint32 bidIncreasePercentage = nftContractAuctions[_nftContractAddress][
            _tokenId
        ].bidIncreasePercentage;

        if (bidIncreasePercentage == 0) {
            return defaultBidIncreasePercentage;
        } else {
            return bidIncreasePercentage;
        }
    }

    function _getAuctionBidPeriod(address _nftContractAddress, uint256 _tokenId)
        internal
        view
        returns (uint32)
    {
        uint32 auctionBidPeriod = nftContractAuctions[_nftContractAddress][
            _tokenId
        ].auctionBidPeriod;

        if (auctionBidPeriod == 0) {
            return defaultAuctionBidPeriod;
        } else {
            return auctionBidPeriod;
        }
    }

    /*
     * The default value for the NFT recipient is the highest bidder
     */
    function _getNftRecipient(address _nftContractAddress, uint256 _tokenId)
        internal
        view
        returns (address)
    {
        address nftRecipient = nftContractAuctions[_nftContractAddress][
            _tokenId
        ].nftRecipient;

        if (nftRecipient == address(0)) {
            return
                nftContractAuctions[_nftContractAddress][_tokenId]
                    .nftHighestBidder;
        } else {
            return nftRecipient;
        }
    }

    /**********************************/
    /*╔══════════════════════════════╗
      ║             END              ║
      ║    DEFAULT GETTER FUNCTIONS  ║
      ╚══════════════════════════════╝*/
    /**********************************/

    /*╔══════════════════════════════╗
      ║  TRANSFER NFTS TO CONTRACT   ║
      ╚══════════════════════════════╝*/
    function _transferNftToAuctionContract(
        address _nftContractAddress,
        uint256 _tokenId
    ) internal {
        address _nftSeller = nftContractAuctions[_nftContractAddress][_tokenId]
            .nftSeller;
        if (IERC721(_nftContractAddress).ownerOf(_tokenId) == _nftSeller) {
            IERC721(_nftContractAddress).transferFrom(
                _nftSeller,
                address(this),
                _tokenId
            );
            require(
                IERC721(_nftContractAddress).ownerOf(_tokenId) == address(this),
                "nft transfer failed"
            );
        } else {
            require(
                IERC721(_nftContractAddress).ownerOf(_tokenId) == address(this),
                "Seller doesn't own NFT"
            );
        }
    }

    /**********************************/
    /*╔══════════════════════════════╗
      ║             END              ║
      ║  TRANSFER NFTS TO CONTRACT   ║
      ╚══════════════════════════════╝*/
    /**********************************/

    /*╔══════════════════════════════╗
      ║       AUCTION CREATION       ║
      ╚══════════════════════════════╝*/

    /**
     * Setup parameters applicable to all auctions and whitelised sales:
     * -> ERC20 Token for payment (if specified by the seller) : _erc20Token
     * -> minimum price : _minPrice
     * -> buy now price : _buyNowPrice
     * -> the nft seller: msg.sender
     * -> The fee recipients & their respective percentages for a sucessful auction/sale
     */
    function _setupAuction(
        address _nftContractAddress,
        uint256 _tokenId,
        address _erc20Token,
        uint128 _minPrice,
        uint128 _buyNowPrice,
        address[] memory _feeRecipients,
        uint32[] memory _feePercentages
    )
        internal
        minPriceDoesNotExceedLimit(_buyNowPrice, _minPrice)
        correctFeeRecipientsAndPercentages(
            _feeRecipients.length,
            _feePercentages.length
        )
        isFeePercentagesLessThanMaximum(_feePercentages)
    {
        if (_erc20Token != address(0)) {
            nftContractAuctions[_nftContractAddress][_tokenId]
                .ERC20Token = _erc20Token;
        }
        nftContractAuctions[_nftContractAddress][_tokenId]
            .feeRecipients = _feeRecipients;
        nftContractAuctions[_nftContractAddress][_tokenId]
            .feePercentages = _feePercentages;
        nftContractAuctions[_nftContractAddress][_tokenId]
            .buyNowPrice = _buyNowPrice;
        nftContractAuctions[_nftContractAddress][_tokenId].minPrice = _minPrice;
        nftContractAuctions[_nftContractAddress][_tokenId].nftSeller = msg
            .sender;
    }

    function _createNewNftAuction(
        address _nftContractAddress,
        uint256 _tokenId,
        address _erc20Token,
        uint128 _minPrice,
        uint128 _buyNowPrice,
        address[] memory _feeRecipients,
        uint32[] memory _feePercentages
    ) internal {
        // Sending the NFT to this contract
        _setupAuction(
            _nftContractAddress,
            _tokenId,
            _erc20Token,
            _minPrice,
            _buyNowPrice,
            _feeRecipients,
            _feePercentages
        );
        emit NftAuctionCreated(
            _nftContractAddress,
            _tokenId,
            msg.sender,
            _erc20Token,
            _minPrice,
            _buyNowPrice,
            _getAuctionBidPeriod(_nftContractAddress, _tokenId),
            _getBidIncreasePercentage(_nftContractAddress, _tokenId),
            _feeRecipients,
            _feePercentages
        );
        _updateOngoingAuction(_nftContractAddress, _tokenId);
    }

    /**
     * Create an auction that uses the default bid increase percentage
     * & the default auction bid period.
     */
    function createDefaultNftAuction(
        address _nftContractAddress,
        uint256 _tokenId,
        address _erc20Token,
        uint128 _minPrice,
        uint128 _buyNowPrice,
        address[] memory _feeRecipients,
        uint32[] memory _feePercentages
    )
        external
        isAuctionNotStartedByOwner(_nftContractAddress, _tokenId)
        priceGreaterThanZero(_minPrice)
    {
        _createNewNftAuction(
            _nftContractAddress,
            _tokenId,
            _erc20Token,
            _minPrice,
            _buyNowPrice,
            _feeRecipients,
            _feePercentages
        );
    }

    function createNewNftAuction(
        address _nftContractAddress,
        uint256 _tokenId,
        address _erc20Token,
        uint128 _minPrice,
        uint128 _buyNowPrice,
        uint32 _auctionBidPeriod, //this is the time that the auction lasts until another bid occurs
        uint32 _bidIncreasePercentage,
        address[] memory _feeRecipients,
        uint32[] memory _feePercentages
    )
        external
        isAuctionNotStartedByOwner(_nftContractAddress, _tokenId)
        priceGreaterThanZero(_minPrice)
        increasePercentageAboveMinimum(_bidIncreasePercentage)
    {
        nftContractAuctions[_nftContractAddress][_tokenId]
            .auctionBidPeriod = _auctionBidPeriod;
        nftContractAuctions[_nftContractAddress][_tokenId]
            .bidIncreasePercentage = _bidIncreasePercentage;
        _createNewNftAuction(
            _nftContractAddress,
            _tokenId,
            _erc20Token,
            _minPrice,
            _buyNowPrice,
            _feeRecipients,
            _feePercentages
        );
    }

    /**********************************/
    /*╔══════════════════════════════╗
      ║             END              ║
      ║       AUCTION CREATION       ║
      ╚══════════════════════════════╝*/
    /**********************************/

    /*╔══════════════════════════════╗
      ║            SALES             ║
      ╚══════════════════════════════╝*/

    /********************************************************************
     * Allows for a standard sale mechanism where the NFT seller can    *
     * can select an address to be whitelisted. This address is then    *
     * allowed to make a bid on the NFT. No other address can bid on    *
     * the NFT.                                                         *
     ********************************************************************/
    function _setupSale(
        address _nftContractAddress,
        uint256 _tokenId,
        address _erc20Token,
        uint128 _buyNowPrice,
        address _whitelistedBuyer,
        address[] memory _feeRecipients,
        uint32[] memory _feePercentages
    )
        internal
        correctFeeRecipientsAndPercentages(
            _feeRecipients.length,
            _feePercentages.length
        )
        isFeePercentagesLessThanMaximum(_feePercentages)
    {
        if (_erc20Token != address(0)) {
            nftContractAuctions[_nftContractAddress][_tokenId]
                .ERC20Token = _erc20Token;
        }
        nftContractAuctions[_nftContractAddress][_tokenId]
            .feeRecipients = _feeRecipients;
        nftContractAuctions[_nftContractAddress][_tokenId]
            .feePercentages = _feePercentages;
        nftContractAuctions[_nftContractAddress][_tokenId]
            .buyNowPrice = _buyNowPrice;
        nftContractAuctions[_nftContractAddress][_tokenId]
            .whitelistedBuyer = _whitelistedBuyer;
        nftContractAuctions[_nftContractAddress][_tokenId].nftSeller = msg
            .sender;
    }

    function createSale(
        address _nftContractAddress,
        uint256 _tokenId,
        address _erc20Token,
        uint128 _buyNowPrice,
        address _whitelistedBuyer,
        address[] memory _feeRecipients,
        uint32[] memory _feePercentages
    )
        external
        isAuctionNotStartedByOwner(_nftContractAddress, _tokenId)
        priceGreaterThanZero(_buyNowPrice)
    {
        //min price = 0
        _setupSale(
            _nftContractAddress,
            _tokenId,
            _erc20Token,
            _buyNowPrice,
            _whitelistedBuyer,
            _feeRecipients,
            _feePercentages
        );

        emit SaleCreated(
            _nftContractAddress,
            _tokenId,
            msg.sender,
            _erc20Token,
            _buyNowPrice,
            _whitelistedBuyer,
            _feeRecipients,
            _feePercentages
        );
        //check if buyNowPrice is meet and conclude sale, otherwise reverse the early bid
        if (_isABidMade(_nftContractAddress, _tokenId)) {
            if (
                //we only revert the underbid if the seller specifies a different
                //whitelisted buyer to the highest bidder
                _isHighestBidderAllowedToPurchaseNFT(
                    _nftContractAddress,
                    _tokenId
                )
            ) {
                if (_isBuyNowPriceMet(_nftContractAddress, _tokenId)) {
                    _transferNftToAuctionContract(
                        _nftContractAddress,
                        _tokenId
                    );
                    _transferNftAndPaySeller(_nftContractAddress, _tokenId);
                }
            } else {
                _reverseAndResetPreviousBid(_nftContractAddress, _tokenId);
            }
        }
    }

    /**********************************/
    /*╔══════════════════════════════╗
      ║             END              ║
      ║            SALES             ║
      ╚══════════════════════════════╝*/
    /**********************************/

    /*╔═════════════════════════════╗
      ║        BID FUNCTIONS        ║
      ╚═════════════════════════════╝*/

    /********************************************************************
     * Make bids with ETH or an ERC20 Token specified by the NFT seller.*
     * Additionally, a buyer can pay the asking price to conclude a sale*
     * of an NFT.                                                      *
     ********************************************************************/

    function _makeBid(
        address _nftContractAddress,
        uint256 _tokenId,
        address _erc20Token,
        uint128 _tokenAmount
    )
        internal
        hasWhitelistedToken
        notNftSeller(_nftContractAddress, _tokenId)
        paymentAccepted(
            _nftContractAddress,
            _tokenId,
            _erc20Token,
            _tokenAmount
        )
        bidAmountMeetsBidRequirements(
            _nftContractAddress,
            _tokenId,
            _tokenAmount
        )
    {
        _reversePreviousBidAndUpdateHighestBid(
            _nftContractAddress,
            _tokenId,
            _tokenAmount
        );
        emit BidMade(
            _nftContractAddress,
            _tokenId,
            msg.sender,
            msg.value,
            _erc20Token,
            _tokenAmount
        );
        _updateOngoingAuction(_nftContractAddress, _tokenId);
    }

    function makeBid(
        address _nftContractAddress,
        uint256 _tokenId,
        address _erc20Token,
        uint128 _tokenAmount
    )
        external
        payable
        auctionOngoing(_nftContractAddress, _tokenId)
        onlyApplicableBuyer(_nftContractAddress, _tokenId)
    {
        _makeBid(_nftContractAddress, _tokenId, _erc20Token, _tokenAmount);
    }

    function makeCustomBid(
        address _nftContractAddress,
        uint256 _tokenId,
        address _erc20Token,
        uint128 _tokenAmount,
        address _nftRecipient
    )
        external
        payable
        auctionOngoing(_nftContractAddress, _tokenId)
        notZeroAddress(_nftRecipient)
        onlyApplicableBuyer(_nftContractAddress, _tokenId)
    {
        nftContractAuctions[_nftContractAddress][_tokenId]
            .nftRecipient = _nftRecipient;
        _makeBid(_nftContractAddress, _tokenId, _erc20Token, _tokenAmount);
    }

    /**********************************/
    /*╔══════════════════════════════╗
      ║             END              ║
      ║        BID FUNCTIONS         ║
      ╚══════════════════════════════╝*/
    /**********************************/

    /*╔══════════════════════════════╗
      ║       UPDATE AUCTION         ║
      ╚══════════════════════════════╝*/

    /***************************************************************
     * Settle an auction or sale if the buyNowPrice is met or set  *
     *  auction period to begin if the minimum price has been met. *
     ***************************************************************/
    function _updateOngoingAuction(
        address _nftContractAddress,
        uint256 _tokenId
    ) internal {
        if (_isBuyNowPriceMet(_nftContractAddress, _tokenId)) {
            _transferNftToAuctionContract(_nftContractAddress, _tokenId);
            _transferNftAndPaySeller(_nftContractAddress, _tokenId);
            return;
        }
        //min price not set, nft not up for auction yet
        if (_isMinimumBidMade(_nftContractAddress, _tokenId)) {
            _transferNftToAuctionContract(_nftContractAddress, _tokenId);
            _updateAuctionEnd(_nftContractAddress, _tokenId);
        }
    }

    function _updateAuctionEnd(address _nftContractAddress, uint256 _tokenId)
        internal
    {
        //the auction end is always set to now + the bid period
        nftContractAuctions[_nftContractAddress][_tokenId].auctionEnd =
            _getAuctionBidPeriod(_nftContractAddress, _tokenId) +
            uint64(block.timestamp);
        emit AuctionPeriodUpdated(
            _nftContractAddress,
            _tokenId,
            nftContractAuctions[_nftContractAddress][_tokenId].auctionEnd
        );
    }

    /**********************************/
    /*╔══════════════════════════════╗
      ║             END              ║
      ║       UPDATE AUCTION         ║
      ╚══════════════════════════════╝*/
    /**********************************/

    /*╔══════════════════════════════╗
      ║       RESET FUNCTIONS        ║
      ╚══════════════════════════════╝*/

    /*
     * Reset all auction related parameters for an NFT.
     * This effectively removes an EFT as an item up for auction
     */
    function _resetAuction(address _nftContractAddress, uint256 _tokenId)
        internal
    {
        nftContractAuctions[_nftContractAddress][_tokenId].minPrice = 0;
        nftContractAuctions[_nftContractAddress][_tokenId].buyNowPrice = 0;
        nftContractAuctions[_nftContractAddress][_tokenId].auctionEnd = 0;
        nftContractAuctions[_nftContractAddress][_tokenId].auctionBidPeriod = 0;
        nftContractAuctions[_nftContractAddress][_tokenId]
            .bidIncreasePercentage = 0;
        nftContractAuctions[_nftContractAddress][_tokenId].nftSeller = address(
            0
        );
        nftContractAuctions[_nftContractAddress][_tokenId]
            .whitelistedBuyer = address(0);
        nftContractAuctions[_nftContractAddress][_tokenId].ERC20Token = address(
            0
        );
    }

    /*
     * Reset all bid related parameters for an NFT.
     * This effectively sets an NFT as having no active bids
     */
    function _resetBids(address _nftContractAddress, uint256 _tokenId)
        internal
    {
        nftContractAuctions[_nftContractAddress][_tokenId]
            .nftHighestBidder = address(0);
        nftContractAuctions[_nftContractAddress][_tokenId].nftHighestBid = 0;
        nftContractAuctions[_nftContractAddress][_tokenId]
            .nftRecipient = address(0);
    }

    /**********************************/
    /*╔══════════════════════════════╗
      ║             END              ║
      ║       RESET FUNCTIONS        ║
      ╚══════════════════════════════╝*/
    /**********************************/

    /*╔══════════════════════════════╗
      ║         UPDATE BIDS          ║
      ╚══════════════════════════════╝*/
    /******************************************************************
     * Internal functions that update bid parameters and reverse bids *
     * to ensure contract only holds the highest bid.                 *
     ******************************************************************/
    function _updateHighestBid(
        address _nftContractAddress,
        uint256 _tokenId,
        uint128 _tokenAmount
    ) internal {
        address auctionERC20Token = nftContractAuctions[_nftContractAddress][
            _tokenId
        ].ERC20Token;
        if (_isERC20Auction(auctionERC20Token)) {
            IERC20(auctionERC20Token).transferFrom(
                msg.sender,
                address(this),
                _tokenAmount
            );
            nftContractAuctions[_nftContractAddress][_tokenId]
                .nftHighestBid = _tokenAmount;
        } else {
            nftContractAuctions[_nftContractAddress][_tokenId]
                .nftHighestBid = uint128(msg.value);
        }
        nftContractAuctions[_nftContractAddress][_tokenId]
            .nftHighestBidder = msg.sender;
    }

    function _reverseAndResetPreviousBid(
        address _nftContractAddress,
        uint256 _tokenId
    ) internal {
        address nftHighestBidder = nftContractAuctions[_nftContractAddress][
            _tokenId
        ].nftHighestBidder;

        uint128 nftHighestBid = nftContractAuctions[_nftContractAddress][
            _tokenId
        ].nftHighestBid;
        _resetBids(_nftContractAddress, _tokenId);

        _payout(_nftContractAddress, _tokenId, nftHighestBidder, nftHighestBid);
    }

    function _reversePreviousBidAndUpdateHighestBid(
        address _nftContractAddress,
        uint256 _tokenId,
        uint128 _tokenAmount
    ) internal {
        address prevNftHighestBidder = nftContractAuctions[_nftContractAddress][
            _tokenId
        ].nftHighestBidder;

        uint256 prevNftHighestBid = nftContractAuctions[_nftContractAddress][
            _tokenId
        ].nftHighestBid;
        _updateHighestBid(_nftContractAddress, _tokenId, _tokenAmount);

        if (prevNftHighestBidder != address(0)) {
            _payout(
                _nftContractAddress,
                _tokenId,
                prevNftHighestBidder,
                prevNftHighestBid
            );
        }
    }

    /**********************************/
    /*╔══════════════════════════════╗
      ║             END              ║
      ║         UPDATE BIDS          ║
      ╚══════════════════════════════╝*/
    /**********************************/

    /*╔══════════════════════════════╗
      ║  TRANSFER NFT & PAY SELLER   ║
      ╚══════════════════════════════╝*/
    function _transferNftAndPaySeller(
        address _nftContractAddress,
        uint256 _tokenId
    ) internal {
        address _nftSeller = nftContractAuctions[_nftContractAddress][_tokenId]
            .nftSeller;
        address _nftHighestBidder = nftContractAuctions[_nftContractAddress][
            _tokenId
        ].nftHighestBidder;
        address _nftRecipient = _getNftRecipient(_nftContractAddress, _tokenId);
        uint128 _nftHighestBid = nftContractAuctions[_nftContractAddress][
            _tokenId
        ].nftHighestBid;
        _resetBids(_nftContractAddress, _tokenId);

        _payFeesAndSeller(
            _nftContractAddress,
            _tokenId,
            _nftSeller,
            _nftHighestBid
        );
        IERC721(_nftContractAddress).transferFrom(
            address(this),
            _nftRecipient,
            _tokenId
        );

        _resetAuction(_nftContractAddress, _tokenId);
        emit NFTTransferredAndSellerPaid(
            _nftContractAddress,
            _tokenId,
            _nftSeller,
            _nftHighestBid,
            _nftHighestBidder,
            _nftRecipient
        );
    }

    function _payFeesAndSeller(
        address _nftContractAddress,
        uint256 _tokenId,
        address _nftSeller,
        uint256 _highestBid
    ) internal {
        uint256 feesPaid;
        for (
            uint256 i = 0;
            i <
            nftContractAuctions[_nftContractAddress][_tokenId]
                .feeRecipients
                .length;
            i++
        ) {
            uint256 fee = _getPortionOfBid(
                _highestBid,
                nftContractAuctions[_nftContractAddress][_tokenId]
                    .feePercentages[i]
            );
            feesPaid = feesPaid + fee;
            _payout(
                _nftContractAddress,
                _tokenId,
                nftContractAuctions[_nftContractAddress][_tokenId]
                    .feeRecipients[i],
                fee
            );
        }
        _payout(
            _nftContractAddress,
            _tokenId,
            _nftSeller,
            (_highestBid - feesPaid)
        );
    }

    function _payout(
        address _nftContractAddress,
        uint256 _tokenId,
        address _recipient,
        uint256 _amount
    ) internal {
        address auctionERC20Token = nftContractAuctions[_nftContractAddress][
            _tokenId
        ].ERC20Token;
        if (_isERC20Auction(auctionERC20Token)) {
            IERC20(auctionERC20Token).transfer(_recipient, _amount);
        } else {
            // attempt to send the funds to the recipient
            (bool success, ) = payable(_recipient).call{
                value: _amount,
                gas: 20000
            }("");
            // if it failed, update their credit balance so they can pull it later
            if (!success) {
                failedTransferCredits[_recipient] =
                    failedTransferCredits[_recipient] +
                    _amount;
            }
        }
    }

    /**********************************/
    /*╔══════════════════════════════╗
      ║             END              ║
      ║  TRANSFER NFT & PAY SELLER   ║
      ╚══════════════════════════════╝*/
    /**********************************/

    /*╔══════════════════════════════╗
      ║      SETTLE & WITHDRAW       ║
      ╚══════════════════════════════╝*/
    function settleAuction(address _nftContractAddress, uint256 _tokenId)
        external
        isAuctionOver(_nftContractAddress, _tokenId)
    {
        _transferNftAndPaySeller(_nftContractAddress, _tokenId);
        emit AuctionSettled(_nftContractAddress, _tokenId, msg.sender);
    }

    function withdrawAuction(address _nftContractAddress, uint256 _tokenId)
        external
    {
        //only the NFT owner can prematurely close and auction
        require(
            IERC721(_nftContractAddress).ownerOf(_tokenId) == msg.sender,
            "Not NFT owner"
        );
        _resetAuction(_nftContractAddress, _tokenId);
        emit AuctionWithdrawn(_nftContractAddress, _tokenId, msg.sender);
    }

    function withdrawBid(address _nftContractAddress, uint256 _tokenId)
        external
        minimumBidNotMade(_nftContractAddress, _tokenId)
    {
        address nftHighestBidder = nftContractAuctions[_nftContractAddress][
            _tokenId
        ].nftHighestBidder;
        require(msg.sender == nftHighestBidder, "Cannot withdraw funds");

        uint128 nftHighestBid = nftContractAuctions[_nftContractAddress][
            _tokenId
        ].nftHighestBid;
        _resetBids(_nftContractAddress, _tokenId);

        _payout(_nftContractAddress, _tokenId, nftHighestBidder, nftHighestBid);

        emit BidWithdrawn(_nftContractAddress, _tokenId, msg.sender);
    }

    /**********************************/
    /*╔══════════════════════════════╗
      ║             END              ║
      ║      SETTLE & WITHDRAW       ║
      ╚══════════════════════════════╝*/
    /**********************************/

    /*╔══════════════════════════════╗
      ║       UPDATE AUCTION         ║
      ╚══════════════════════════════╝*/
    function updateWhitelistedBuyer(
        address _nftContractAddress,
        uint256 _tokenId,
        address _newWhitelistedBuyer
    ) external onlyNftSeller(_nftContractAddress, _tokenId) {
        require(_isASale(_nftContractAddress, _tokenId), "Not a sale");
        nftContractAuctions[_nftContractAddress][_tokenId]
            .whitelistedBuyer = _newWhitelistedBuyer;
        //if an underbid is by a non whitelisted buyer,reverse that bid
        address nftHighestBidder = nftContractAuctions[_nftContractAddress][
            _tokenId
        ].nftHighestBidder;
        uint128 nftHighestBid = nftContractAuctions[_nftContractAddress][
            _tokenId
        ].nftHighestBid;
        if (nftHighestBid > 0 && !(nftHighestBidder == _newWhitelistedBuyer)) {
            //we only revert the underbid if the seller specifies a different
            //whitelisted buyer to the highest bider

            _resetBids(_nftContractAddress, _tokenId);

            _payout(
                _nftContractAddress,
                _tokenId,
                nftHighestBidder,
                nftHighestBid
            );
        }

        emit WhitelistedBuyerUpdated(
            _nftContractAddress,
            _tokenId,
            _newWhitelistedBuyer
        );
    }

    function updateMinimumPrice(
        address _nftContractAddress,
        uint256 _tokenId,
        uint128 _newMinPrice
    )
        external
        onlyNftSeller(_nftContractAddress, _tokenId)
        minimumBidNotMade(_nftContractAddress, _tokenId)
        isNotASale(_nftContractAddress, _tokenId)
        priceGreaterThanZero(_newMinPrice)
        minPriceDoesNotExceedLimit(
            nftContractAuctions[_nftContractAddress][_tokenId].buyNowPrice,
            _newMinPrice
        )
    {
        nftContractAuctions[_nftContractAddress][_tokenId]
            .minPrice = _newMinPrice;

        emit MinimumPriceUpdated(_nftContractAddress, _tokenId, _newMinPrice);

        if (_isMinimumBidMade(_nftContractAddress, _tokenId)) {
            _transferNftToAuctionContract(_nftContractAddress, _tokenId);
            _updateAuctionEnd(_nftContractAddress, _tokenId);
        }
    }

    function updateBuyNowPrice(
        address _nftContractAddress,
        uint256 _tokenId,
        uint128 _newBuyNowPrice
    )
        external
        onlyNftSeller(_nftContractAddress, _tokenId)
        priceGreaterThanZero(_newBuyNowPrice)
        minPriceDoesNotExceedLimit(
            _newBuyNowPrice,
            nftContractAuctions[_nftContractAddress][_tokenId].minPrice
        )
    {
        nftContractAuctions[_nftContractAddress][_tokenId]
            .buyNowPrice = _newBuyNowPrice;
        emit BuyNowPriceUpdated(_nftContractAddress, _tokenId, _newBuyNowPrice);
        if (_isBuyNowPriceMet(_nftContractAddress, _tokenId)) {
            _transferNftToAuctionContract(_nftContractAddress, _tokenId);
            _transferNftAndPaySeller(_nftContractAddress, _tokenId);
        }
    }

    /*
     * The NFT seller can opt to end an auction by taking the current highest bid.
     */
    function takeHighestBid(address _nftContractAddress, uint256 _tokenId)
        external
        onlyNftSeller(_nftContractAddress, _tokenId)
    {
        require(
            _isABidMade(_nftContractAddress, _tokenId),
            "cannot payout 0 bid"
        );
        _transferNftToAuctionContract(_nftContractAddress, _tokenId);
        _transferNftAndPaySeller(_nftContractAddress, _tokenId);
        emit HighestBidTaken(_nftContractAddress, _tokenId);
    }

    /*
     * Query the owner of an NFT deposited for auction
     */
    function ownerOfNFT(address _nftContractAddress, uint256 _tokenId)
        external
        view
        returns (address)
    {
        address nftSeller = nftContractAuctions[_nftContractAddress][_tokenId]
            .nftSeller;
        require(nftSeller != address(0), "NFT not deposited");

        return nftSeller;
    }

    /*
     * If the transfer of a bid has failed, allow the recipient to reclaim their amount later.
     */
    function withdrawAllFailedCredits() external {
        uint256 amount = failedTransferCredits[msg.sender];

        require(amount != 0, "no credits to withdraw");

        failedTransferCredits[msg.sender] = 0;

        (bool successfulWithdraw, ) = msg.sender.call{
            value: amount,
            gas: 20000
        }("");
        require(successfulWithdraw, "withdraw failed");
    }

    /**********************************/
    /*╔══════════════════════════════╗
      ║             END              ║
      ║       UPDATE AUCTION         ║
      ╚══════════════════════════════╝*/
    /**********************************/
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "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`, 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 be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

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

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

    /**
     * @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 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);

    /**
      * @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;
}

// SPDX-License-Identifier: MIT

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

pragma solidity ^0.8.0;

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IWithBalance {
    function balanceOf(address owner) external view returns (uint256);
}

{
  "evmVersion": "istanbul",
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "libraries": {
    "NFTAuction.sol": {}
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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ress"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_nftContractAddress","type":"address"},{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"ownerOfNFT","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"removeWhitelistedCollection","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_nftContractAddress","type":"address"},{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"settleAuction","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_nftContractAddress","type":"address"},{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"takeHighestBid","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_nftContractAddress","type":"address"},{"internalType":"uint256","name":"_tokenId","type":"uint256"},{"internalType":"uint128","name":"_newBuyNowPrice","type":"uint128"}],"name":"updateBuyNowPrice","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_nftContractAddress","type":"address"},{"internalType":"uint256","name":"_tokenId","type":"uint256"},{"internalType":"uint128","name":"_newMinPrice","type":"uint128"}],"name":"updateMinimumPrice","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_nftContractAddress","type":"address"},{"internalType":"uint256","name":"_tokenId","type":"uint256"},{"internalType":"address","name":"_newWhitelistedBuyer","type":"address"}],"name":"updateWhitelistedBuyer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"whitelistedPassCollections","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"withdrawAllFailedCredits","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_nftContractAddress","type":"address"},{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"withdrawAuction","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_nftContractAddress","type":"address"},{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"withdrawBid","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000003000000000000000000000000d3228e099e6596988ae0b73eaa62591c875e56930000000000000000000000005dc23613fd54a87c3b8a7134534110f5180433c8000000000000000000000000932aeac0eebaa1fe8fdb53c4f81312cba5f771a8

-----Decoded View---------------
Arg [0] : _whitelistedPassCollectionsAddresses (address[]): 0xD3228e099E6596988Ae0b73EAa62591c875e5693,0x5DC23613fD54A87C3b8A7134534110F5180433C8,0x932aEAc0eEBaA1fE8fdB53C4f81312cBA5F771A8

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000020
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [2] : 000000000000000000000000d3228e099e6596988ae0b73eaa62591c875e5693
Arg [3] : 0000000000000000000000005dc23613fd54a87c3b8a7134534110f5180433c8
Arg [4] : 000000000000000000000000932aeac0eebaa1fe8fdb53c4f81312cba5f771a8