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// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0 <0.9.0;

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


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/**
 * @title NFT Marketplace
 * @author VINCI
 * @notice This contract support multiple NFT contract addresses
 * Vinci ERC20 token.
 */
contract VinciNFTMarketplace is Ownable {
    /// The backing NFT contract

    /// Tokens withdrawable by address of the ERC20 token.
    mapping(address => mapping(address => uint256)) public withdrawable;

    /// Current sales (NFTcontract => (tokenId => Sale))
    mapping(IERC721 => mapping(uint256 => Sale)) public sales;

    /// Current english auctions (NFTcontract => (tokenId => EnglishAuction))
    mapping(IERC721 => mapping(uint256 => EnglishAuction)) public englishAuctions;

    /// Current dutch auctions (NFTcontract => (tokenId => DucthAuction))
    mapping(IERC721 => mapping(uint256 => DutchAuction)) public dutchAuctions;

    /// Reentrancy lock
    bool private _locked;

    /// Fee in basis points
    uint256 public fee;

    // Margin in seconds for Dutch auction
    uint8 public marginSecondsDutchAuction = 180;

    /**
     * @notice An object describing a price
     * @param erc20Contract The address of the erc20 contract
     * @param price         The amount specified in erc20
     */
    struct Price {
        address erc20Contract;
        uint256 price;
    }

    /**
     * @dev An object describing a sale.
     * @param owner The owner of the NFT
     * @param erc20Contracts ERC20 contracts
     * @param prices         The prices of the NFT (denoted in erc20Contracts)
     * @dev Note that storage[] struct is not supported in Solidity, so we have
     *      to work around this by storing the values separately.
     */
    struct Sale {
        address owner;
        address[] erc20Contracts;
        uint256[] prices;
    }

    /**
     * @dev An object describing an english auction. English auctions are
     *      restricted by time. Any bid extends by a given amount of seconds.
     *
     * @param owner        The owner of the NFT
     * @param minPrice     The minimum amount that needs to be bid
     * @param bidder       The currently highest bidder. If no bid has been
     *                     made so far, bidder is address(0)
     * @param amount       The amount of the highest bid. If no bid has
     *                     been made so far, amount is 0
     * @param erc20token   Token used for bidding. Use address(0) for native payments
     * @param closeTime    The time when the auction closes
     * @param timeIncrease Amount of time added to the close time on every
     *                     bid
     */
    struct EnglishAuction {
        address owner;
        uint256 minPrice;
        address bidder;
        uint256 amount;
        address erc20token;
        uint256 closeTime;
        uint256 timeIncrease;
    }

    /**
     * @dev An object describing a dutch auction.
     * @param owner         The owner of the NFT
     * @param startPrice    The starting price of the dutch auction
     * @param endPrice      The ending price of the dutch auction
     * @param start         Timestamp of the auction start. It establishes when the price starts decreasing,
     although it can be bought before the start date.
     * @param end           Timestamp of the auction end. It establishes when the price stops decreasing,
     although it can be bought after this date.
     * @param erc20token    token used for the auction. Address(0) if native payment
     */
    struct DutchAuction {
        address owner;
        uint256 startPrice;
        uint256 endPrice;
        uint256 start;
        uint256 end;
        address erc20token;
    }

    modifier reentrancyLock() {
        require(!_locked, "locked");
        _locked = true;
        _;
        _locked = false;
    }

    modifier notSoldOrInAuction(IERC721 _nftContract, uint256 _tokenId) {
        require(
            sales[_nftContract][_tokenId].owner == address(0),
            "Token is already being sold"
        );
        require(
            englishAuctions[_nftContract][_tokenId].owner == address(0),
            "Token is already in english auction"
        );
        require(
            dutchAuctions[_nftContract][_tokenId].owner == address(0),
            "Token is already in dutch auction"
        );
        _;
    }

    modifier beingSold(IERC721 _nftContract, uint256 _tokenId) {
        require(sales[_nftContract][_tokenId].owner != address(0), "Token is not being sold");
        _;
    }

    modifier beingEnglishAuctioned(IERC721 _nftContract, uint256 _tokenId) {
        require(
            englishAuctions[_nftContract][_tokenId].owner != address(0),
            "Token is not being auctioned"
        );
        require(
            englishAuctions[_nftContract][_tokenId].closeTime > block.timestamp,
            "Auction is closed"
        );
        _;
    }

    // Start and end dates of Dutch auction do not modify the beingDutchAuctioned status.
    // It can be sold at any time regardless of start and end date.
    modifier beingDutchAuctioned(IERC721 _nftContract, uint256 _tokenId) {
        require(
            dutchAuctions[_nftContract][_tokenId].owner != address(0),
            "Token is not being auctioned"
        );
        _;
    }

    /**
     * @dev Event for the start of a sale
     * @param _nftContract Contract address of the NFT
     * @param tokenId The id of the NFT
     * @param owner   The owner of the NFT
     * @param prices  List of prices of the sale (list of Price struct)
     */
    event SaleStarted(
        IERC721 _nftContract,
        uint256 tokenId,
        address owner,
        Price[] prices
    );

    /**
     * @dev Event for the start of a sale
     * @param _nftContract Contract address of the NFT
     * @param tokenId The id of the NFT
     * @param owner   The owner of the NFT
     * @param prices   List of prices of the sale (list of Price struct)
     */
    event SaleStartedInBatch(
        IERC721 _nftContract,
        uint256 tokenId,
        address owner,
        Price[] prices
    );

    /**
     * @dev Event for the cancel of a sale
     * @param _nftContract Contract address of the NFT
     * @param tokenId The id of the NFT
     * @param owner   The owner of the NFT
     */
    event SaleCanceled(
        IERC721 _nftContract,
        uint256 tokenId,
        address owner
    );

    /**
     * @dev Event for a successful sale
     * @param _nftContract Contract address of the NFTf
     * @param tokenId       The id of the NFT
     * @param price         The price of the NFT (denoted in erc20contract)
     * @param buyer         The buyer of the NFT
     * @param erc20contract The buyer of the NFT
     */
    event NFTSold(
        IERC721 _nftContract,
        uint256 tokenId,
        uint256 price,
        address buyer,
        address erc20contract
    );

    /**
     * @dev Event for the start of an english auction
     * @param _nftContract Contract address of the NFT
     * @param tokenId      The id of the NFT
     * @param minPrice     The minimum bid
     * @param owner        The owner of the NFT
     * @param erc20token   Token address in which NFT is being auctioned
     * @param closeTime    Timestamp when this auction closes
     * @param timeIncrease Amount of seconds added to close time on every bid
     */
    event EnglishAuctionStarted(
        IERC721 _nftContract,
        uint256 tokenId,
        uint256 minPrice,
        address owner,
        address erc20token,
        uint256 closeTime,
        uint256 timeIncrease
    );

    /**
     * @dev Event for a new bid on an english auction
     * @param _nftContract Contract address of the NFT
     * @param tokenId The id of the NFT
     * @param amount  The bid
     * @param bidder  The bidder
     */
    event EnglishNewBid(
        IERC721 _nftContract,
        uint256 tokenId,
        uint256 amount,
        address bidder
    );

    /**
     * @dev Event for a successful auction
     * @param _nftContract Contract address of the NFT
     * @param tokenId The id of the NFT
     * @param amount  The price of the NFT (denoted in erc20contract of the auction)
     * @param buyer   The buyer of the NFT
     */
    event EnglishAuctionFinalized(
        IERC721 _nftContract,
        uint256 tokenId,
        uint256 amount,
        address buyer
    );

    /**
     * @dev Event for a canceled english auction
     * @param _nftContract Contract address of the NFT
     * @param tokenId The id of the NFT
     * @param owner   The owner of the NFT
     */
    event EnglishAuctionCanceled(
        IERC721 _nftContract,
        uint256 tokenId,
        address owner
    );

    /**
     * @dev Event for the start of a dutch auction
     * @param _nftContract Contract address of the NFT
     * @param tokenId    The id of the NFT
     * @param startPrice Starting price
     * @param endPrice   Ending price
     * @param start      Starting timestamp
     * @param end        Ending timestamp
     * @param erc20token    token used for the auction. Address(0) if native payment
     */
    event DutchAuctionStarted(
        IERC721 _nftContract,
        uint256 tokenId,
        uint256 startPrice,
        uint256 endPrice,
        uint256 start,
        uint256 end,
        address erc20token
    );

    /**
     * @dev Event for a successful dutch auction
     * @param _nftContract Contract address of the NFT
     * @param tokenId       The id of the NFT
     * @param amount        The price of the NFT (denoted in erc20contract of the auction)
     * @param buyer         The buyer of the NFT
     * @param erc20token    token used for the auction. Address(0) if native payment
     */
    event DutchAuctionFinalized(
        IERC721 _nftContract,
        uint256 tokenId,
        uint256 amount,
        address buyer,
        address erc20token
    );

    /**
     * @dev Event for a canceled dutch auction
     * @param _nftContract Contract address of the NFT
     * @param tokenId The id of the NFT
     * @param owner   The owner of the NFT
     */
    event DutchAuctionCanceled(
        IERC721 _nftContract,
        uint256 tokenId,
        address owner
    );

    /**
     * @dev Event for a withdrawal action
     * @param erc20token   address of the token withdrawn (address(0) for native token)
     * @param amount        amount withdrawn
     * @param sender        caller
     */
    event Withdrawal(
        address erc20token,
        uint amount,
        address sender
    );

    /**
     * @dev Create a new NFT auction contract
     */
    constructor() {
        _locked = false;
        fee = 1500;
        // 15% fees kept by VINCI to give to the artists on the first sale
    }

    /**
     * @notice Witdraw ERC20 token that belong to me. Use this function to
     *         withdraw after a successful auction or sale, or when a bid was
     *         outbid.
     * @param _erc20token The address of the erc20 token
     */
    function withdraw(address _erc20token) public reentrancyLock {
        address sender = _msgSender();
        uint256 amount = withdrawable[sender][_erc20token];
        require(amount > 0, "Nothing to withdraw");

        withdrawable[sender][_erc20token] = 0;

        // address(0) is used as a proxy for native currency payments
        if (_erc20token == address(0)) {
            (bool success,) = sender.call{value : amount}("");
            require(success, "Native payment to address failed");
        } else {
            IERC20 _erc20contract = IERC20(_erc20token);
            require(_erc20contract.balanceOf(address(this)) >= amount, "Not enough funds in contract");
            _erc20contract.transfer(sender, amount);
        }
        emit Withdrawal(_erc20token, amount, sender);
    }

    /**
     * @notice Set the fee. Only owner.
     * @param _fee The fee specified in BPS
     */
    function setFee(uint256 _fee) public onlyOwner {
        require(_fee <= 10000, "Can't set a fee larger than 100%");
        fee = _fee;
    }

    /**
     * @notice Sets the margin in seconds for which not to take into account the price
     variations in a dutch bid
     * @param _marginSecondsDutchAuction margin in seconds
     */
    function setMarginSecondsForDutchAuction(uint8 _marginSecondsDutchAuction) public onlyOwner {
        require(_marginSecondsDutchAuction > 0, "Can't set a negative number");
        marginSecondsDutchAuction = _marginSecondsDutchAuction;
    }


    /**
     * @notice Start a new sale
     * @dev Emits a `SaleStarted` event
     * @dev While the sale proceeds, the NFT is stored inside of the sales
     *      contract.
     * @param _nftContract Contract address of the NFT
     * @param _tokenId        The id of the NFT
     * @param prices         Prices of the sale
     */
    function startSale(IERC721 _nftContract, uint256 _tokenId, Price[] calldata prices)
    public
    reentrancyLock
    notSoldOrInAuction(_nftContract, _tokenId)
    {
        require(prices.length <= 10, "Only up to 10 prices are supported");
        require(prices.length > 0, "At least one price needs to be specified");

        uint256[] memory _prices = new uint256[](prices.length);
        address[] memory _addresses = new address[](prices.length);

        for (uint256 i = 0; i < prices.length; i++) {
            _prices[i] = prices[i].price;
            _addresses[i] = prices[i].erc20Contract;
        }

        sales[_nftContract][_tokenId] = Sale(_msgSender(), _addresses, _prices);

        _nftContract.transferFrom(_msgSender(), address(this), _tokenId);
        emit SaleStarted(_nftContract, _tokenId, _msgSender(), prices);
    }

    /**
     * @notice Start a new sale for multiple _tokenIds in the same transaction (to save gas)
               All tokens are put for sale for the same price (and the same erc20 token)
               Accepts the zero address for native payments

     * @dev Emits a `SaleStartedInBatch` event
     * @dev While the sale proceeds, the NFT is stored inside of the sales
     *      contract.
     * @param _nftContract Contract address of the NFT
     * @param _tokenIds       The id of the NFT
     * @param prices         Array of Prices for the sale. Price is [address erc20contract, uint256 price]
     */
    function startBatchSale(
        IERC721 _nftContract,
        uint256[] calldata _tokenIds,
        Price[] calldata prices
    ) public {
        require(_tokenIds.length < 301, "Only up to 300 tokenIds at once");
        require(prices.length <= 10, "Only up to 10 prices are supported");
        require(prices.length > 0, "At least one price needs to be specified");

        uint256[] memory _prices = new uint256[](prices.length);
        address[] memory _addresses = new address[](prices.length);

        for (uint256 i = 0; i < prices.length; i++) {
            _prices[i] = prices[i].price;
            _addresses[i] = prices[i].erc20Contract;
        }

        for (uint i = 0; i < _tokenIds.length; i++) {
            sales[_nftContract][_tokenIds[i]] = Sale(_msgSender(), _addresses, _prices);
            _nftContract.transferFrom(_msgSender(), address(this), _tokenIds[i]);
            emit SaleStartedInBatch(_nftContract, _tokenIds[i], _msgSender(), prices);
        }
    }

    /**
     * @notice Cancel of an ongoing sale
     * @dev Emits a `SaleCanceled` event
     * @notice Returns the NFT to its owner
     * @param _nftContract Contract address of the NFT
     * @param _tokenId The id of the token
     * @dev Requires to be executed as the same account that initially crated
     *      the sale.
     */
    function cancelSale(IERC721 _nftContract, uint256 _tokenId)
    public
    reentrancyLock
    beingSold(_nftContract, _tokenId)
    {
        require(_msgSender() == sales[_nftContract][_tokenId].owner, "Must be token owner");
        delete sales[_nftContract][_tokenId].owner;
        delete sales[_nftContract][_tokenId].prices;
        delete sales[_nftContract][_tokenId].erc20Contracts;
        _nftContract.transferFrom(address(this), _msgSender(), _tokenId);
        emit SaleCanceled(_nftContract, _tokenId, _msgSender());
    }

    /**
     * @notice Buy an NFT for sale. Requires ERC20 to be approved. Use address(0) to buy with native token
     * @dev Transfers NFT, makes ERC20 claimable
     * @param _nftContract Contract address of the NFT
     * @param _tokenId       The id of the token to buy
     * @param _erc20Contract The address of the ERC20 the buyer wants to use. Use address(0) to buy
     with native token
     */
    function buy(IERC721 _nftContract, uint256 _tokenId, address _erc20Contract)
    public
    payable
    reentrancyLock
    beingSold(_nftContract, _tokenId)
    {
        uint256 price = 0;
        bool found = false;
        for (uint256 i = 0; i < sales[_nftContract][_tokenId].erc20Contracts.length; i++) {
            if (sales[_nftContract][_tokenId].erc20Contracts[i] == _erc20Contract) {
                found = true;
                price = sales[_nftContract][_tokenId].prices[i];
            }
        }
        require(
            found,
            "The token is not being sold in exchange for the given erc20 address"
        );

        _addWithdrawable(sales[_nftContract][_tokenId].owner, _erc20Contract, price);
        delete sales[_nftContract][_tokenId].owner;
        delete sales[_nftContract][_tokenId].prices;
        delete sales[_nftContract][_tokenId].erc20Contracts;

        // Execute payments
        if (_erc20Contract == address(0)) {
            // for native payments, the payment needs to come in the msg.value
            require(msg.value == price, "Not enough value to purchase");
        } else {
            IERC20 erc20 = IERC20(_erc20Contract);
            require(msg.value == 0, "Payment cannot be in ERC20 and native currency simultaneously");
            require(erc20.balanceOf(_msgSender()) >= price, "Not enough token balance");
            erc20.transferFrom(_msgSender(), address(this), price);
        }
        _nftContract.transferFrom(address(this), _msgSender(), _tokenId);

        emit NFTSold(_nftContract, _tokenId, price, _msgSender(), _erc20Contract);
    }


    /**
     * @notice Start a new english auction. The NFT is kept in this contract
     *         during the auction
     * @param _nftContract Contract address of the NFT
     * @param _tokenId      The id of the token to start auctioning
     * @param minPrice     The minimum amount a bid should be
     * @param erc20token   Token address in which the item is being auctioned
     * @param closeTime    Timestamp when the auction should close
     * @param timeIncrease How many seconds are added for every bid?
     */
    function englishStartAuction(
        IERC721 _nftContract,
        uint256 _tokenId,
        uint256 minPrice,
        uint256 closeTime,
        uint256 timeIncrease,
        address erc20token
    ) public reentrancyLock notSoldOrInAuction(_nftContract, _tokenId) {
        // It must be -1, because bids can only enter if greater than current amount
        uint amount = minPrice == 0 ? 0 : minPrice - 1;

        englishAuctions[_nftContract][_tokenId] = EnglishAuction(
            _msgSender(),
            minPrice,
            address(0),
            amount,
            erc20token,
            closeTime,
            timeIncrease
        );
        _nftContract.transferFrom(_msgSender(), address(this), _tokenId);
        emit EnglishAuctionStarted(
            _nftContract,
            _tokenId,
            minPrice,
            _msgSender(),
            erc20token,
            closeTime,
            timeIncrease
        );
    }

    /**
     * @notice Bid on an english auction
     * @param _tokenId Id of token
     * @param amount  Amount being bid
     */
    function englishBid(IERC721 _nftContract, uint256 _tokenId, uint256 amount)
    public
    payable
    reentrancyLock
    beingEnglishAuctioned(_nftContract, _tokenId) {

        address sender = _msgSender();
        address erc20BidToken = englishAuctions[_nftContract][_tokenId].erc20token;

        require(amount >= englishAuctions[_nftContract][_tokenId].amount, "Bid is not high enough");

        // store tokens from the previous bidder in a withdrawable
        if (englishAuctions[_nftContract][_tokenId].bidder != address(0)) {
            withdrawable[englishAuctions[_nftContract][_tokenId].bidder][
            address(englishAuctions[_nftContract][_tokenId].erc20token)
            ] += englishAuctions[_nftContract][_tokenId].amount;
        }

        englishAuctions[_nftContract][_tokenId].bidder = sender;
        englishAuctions[_nftContract][_tokenId].amount = amount;
        englishAuctions[_nftContract][_tokenId].closeTime += englishAuctions[_nftContract][_tokenId].timeIncrease;

        if (erc20BidToken == address(0)) {
            // for native payments, the payment needs to come in the msg.value
            require(msg.value == amount, "Value not matching amount");
        } else {
            require(msg.value == 0, "No need to add value if paid with ERC20");
            IERC20 erc20BidContract = IERC20(erc20BidToken);
            // if sender does not have enough tokens, the transaction will simply revert
            erc20BidContract.transferFrom(sender, address(this), amount);
        }

        emit EnglishNewBid(_nftContract, _tokenId, amount, _msgSender());
    }

    /**
     * @notice Cancel English auction. This is only possible as long as there
     *         has not been any bids so far.
     * @param _nftContract Contract address of the NFT
     * @param _tokenId The token to cancel the auction for
     */
    function englishCancelAuction(IERC721 _nftContract, uint256 _tokenId) public reentrancyLock {
        require(
            englishAuctions[_nftContract][_tokenId].owner == _msgSender(),
            "Must be token owner"
        );
        require(
            englishAuctions[_nftContract][_tokenId].bidder == address(0),
            "There is already a bid, can't cancel anymore"
        );

        _deleteEnglishAuction(_nftContract, _tokenId);

        _nftContract.transferFrom(address(this), _msgSender(), _tokenId);
        emit EnglishAuctionCanceled(_nftContract, _tokenId, _msgSender());
    }

    /**
     * @notice Finalize an english auction. Call this once the auction is over
     *         to accept the final bid.
     * @param _nftContract Contract address of the NFT
     * @param _tokenId The token id
     */
    function englishFinalizeAuction(IERC721 _nftContract, uint256 _tokenId) public reentrancyLock {
        require(
            englishAuctions[_nftContract][_tokenId].owner != address(0),
            "Token is not being auctioned"
        );
        require(
            englishAuctions[_nftContract][_tokenId].closeTime <= block.timestamp ||
            _msgSender() == englishAuctions[_nftContract][_tokenId].owner,
            "Only the owner can finalize the auction before its end"
        );
        require(
            englishAuctions[_nftContract][_tokenId].bidder != address(0),
            "No bid has been made"
        );

        uint256 amount = englishAuctions[_nftContract][_tokenId].amount;
        _addWithdrawable(
            englishAuctions[_nftContract][_tokenId].owner,
            englishAuctions[_nftContract][_tokenId].erc20token,
            amount
        );

        _nftContract.transferFrom(
            address(this),
            englishAuctions[_nftContract][_tokenId].bidder,
            _tokenId
        );

        emit EnglishAuctionFinalized(
            _nftContract,
            _tokenId,
            amount,
            englishAuctions[_nftContract][_tokenId].bidder
        );

        _deleteEnglishAuction(_nftContract, _tokenId);
    }

    /**
     * @notice Starts a new dutch auction. The NFT is kept in this contract
     *         during the auction
     * @param _nftContract Contract address of the NFT
     * @param _tokenId       The id of the token
     * @param startPrice    Starting price
     * @param endPrice      Ending price
     * @param start         Starting timestamp
     * @param end           Ending timestamp
     * @param erc20token    token used for the auction. Address(0) if native payment
     */
    function dutchStartAuction(
        IERC721 _nftContract,
        uint256 _tokenId,
        uint256 startPrice,
        uint256 endPrice,
        uint256 start,
        uint256 end,
        address erc20token
    ) public reentrancyLock notSoldOrInAuction(_nftContract, _tokenId) {
        require(startPrice > endPrice, "Price has to be decreasing with time");
        require(start < end, "End has to be after start");

        dutchAuctions[_nftContract][_tokenId] = DutchAuction(
            _msgSender(),
            startPrice,
            endPrice,
            start,
            end,
            erc20token
        );
        _nftContract.transferFrom(_msgSender(), address(this), _tokenId);
        emit DutchAuctionStarted(_nftContract, _tokenId, startPrice, endPrice, start, end, erc20token);
    }

    /**
     * @notice Function to determine price of dutch auction at given timestamp
     * @param _nftContract Contract address of the NFT
     * @param _tokenId   The token id
     * @param timestamp The timestamp.
     * @return The price of the token
     */
    function dutchAuctionPriceAtTimestamp(IERC721 _nftContract, uint256 _tokenId, uint256 timestamp)
    public
    view
    beingDutchAuctioned(_nftContract, _tokenId)
    returns (uint256)
    {
        if (timestamp <= dutchAuctions[_nftContract][_tokenId].start) {
            return dutchAuctions[_nftContract][_tokenId].startPrice;
        }
        if (dutchAuctions[_nftContract][_tokenId].end <= timestamp) {
            return dutchAuctions[_nftContract][_tokenId].endPrice;
        }
        return
        dutchAuctions[_nftContract][_tokenId].startPrice -
        ((timestamp - dutchAuctions[_nftContract][_tokenId].start) *
        (dutchAuctions[_nftContract][_tokenId].startPrice -
        dutchAuctions[_nftContract][_tokenId].endPrice)) /
        (dutchAuctions[_nftContract][_tokenId].end - dutchAuctions[_nftContract][_tokenId].start);
    }

    /**
     * @notice Function to determine current price of dutch auction
     * @param _nftContract Contract address of the NFT
     * @param _tokenId   The token id
     * @return The price of the token
     */
    function dutchAuctionCurrentPrice(IERC721 _nftContract, uint256 _tokenId)
    public
    view
    returns (uint256)
    {
        return dutchAuctionPriceAtTimestamp(_nftContract, _tokenId, block.timestamp);
    }

    /**
     * @notice Buy a token from a dutch auction
     * @param _nftContract Contract address of the NFT
     * @param _tokenId The id of the token
     */
    function dutchBuyToken(IERC721 _nftContract, uint256 _tokenId)
    public
    payable
    reentrancyLock
    beingDutchAuctioned(_nftContract, _tokenId)
    {
        uint256 price = dutchAuctionCurrentPrice(_nftContract, _tokenId);
        address erc20BidToken = dutchAuctions[_nftContract][_tokenId].erc20token;

        _addWithdrawable(
            dutchAuctions[_nftContract][_tokenId].owner,
            address(erc20BidToken), // address(0) for native payment
            price
        );

        if (erc20BidToken == address(0)) {
            // for native payments, the payment needs to come in the msg.value

            require(msg.value >= price, "Not enough value to purchase");
            require(msg.value < price + marginSecondsDutchAuction * _priceDropPerSecondForDutchAuction(_nftContract, _tokenId), "Value too high");
        } else {
            IERC20 erc20BidContract = IERC20(erc20BidToken);
            erc20BidContract.transferFrom(_msgSender(), address(this), price);
        }
        _nftContract.transferFrom(address(this), _msgSender(), _tokenId);

        emit DutchAuctionFinalized(_nftContract, _tokenId, price, _msgSender(), erc20BidToken);
        _deleteDutchAuction(_nftContract, _tokenId);
    }

    /**
     * @notice Owner of NFT Cancels a dutch auction only when it has finished. Used to retrieve
     the NFT (by the owner) when nobody has set a bid on it before the end-time.
     * @param _nftContract Contract address of the NFT
     * @param _tokenId The id of the token
     */
    function dutchCancelAuction(IERC721 _nftContract, uint256 _tokenId)
    public
    reentrancyLock
    beingDutchAuctioned(_nftContract, _tokenId)
    {
        require(
            dutchAuctions[_nftContract][_tokenId].end <= block.timestamp,
            "Auction has not ended yet"
        );

        require(_msgSender() == dutchAuctions[_nftContract][_tokenId].owner, "Must be token owner");

        emit DutchAuctionCanceled(_nftContract, _tokenId, dutchAuctions[_nftContract][_tokenId].owner);

        _nftContract.transferFrom(
            address(this),
            dutchAuctions[_nftContract][_tokenId].owner,
            _tokenId
        );

        _deleteDutchAuction(_nftContract, _tokenId);
    }

    /**
     * @notice Get owner of sale
     * @param _nftContract Contract address of the NFT
     * @param _tokenId The id of the token
     */
    function getSaleOwner(IERC721 _nftContract, uint256 _tokenId) public view returns (address) {
        return sales[_nftContract][_tokenId].owner;
    }

    /**
     * @notice Get number of prices of a sale
     * @param _nftContract Contract address of the NFT
     * @param tokenId The id of the token
     */
    function getSalePricesLength(IERC721 _nftContract, uint256 tokenId)
    public
    view
    returns (uint256)
    {
        return sales[_nftContract][tokenId].prices.length;
    }

    /**
     * @notice Get a price of a sale
     * @param _nftContract Contract address of the NFT
     * @param tokenId The id of the token
     * @param index   The index into the sale array
     */
    function getSalePrice(IERC721 _nftContract, uint256 tokenId, uint256 index)
    public
    view
    returns (Price memory)
    {
        return
        Price(
            sales[_nftContract][tokenId].erc20Contracts[index],
            sales[_nftContract][tokenId].prices[index]
        );
    }

    /**
     * @notice Displays the last price bid on a tokenId that is being auctioned
     * @param _nftContract Contract address of the NFT
     * @param tokenId The id of the token
     */
    function readEnglishAuctionCurrentPrice(IERC721 _nftContract, uint256 tokenId) public view returns (uint){
        require(isInEnglishAuction(_nftContract, tokenId), "Not in English auction");
        return englishAuctions[_nftContract][tokenId].amount;
    }

    /**
     * @notice Reads the ERC20 in which the tokenId is being auctioned. Returns 0x address if auctioned with nativee
     * @param _nftContract Contract address of the NFT
     * @param tokenId The id of the token
     */
    function readEnglishAuctionERC20token(IERC721 _nftContract, uint256 tokenId) public view returns (address){
        require(isInEnglishAuction(_nftContract, tokenId), "Not in English auction");
        return englishAuctions[_nftContract][tokenId].erc20token;
    }

    /**
     * @notice Reads the ERC20 in which the tokenId is being auctioned. Returns 0x address if auctioned with nativee
     * @param _nftContract Contract address of the NFT
     * @param tokenId The id of the token
     */
    function readDucthAuctionERC20token(IERC721 _nftContract, uint256 tokenId) public view returns (address){
        require(isInDutchAuction(_nftContract, tokenId), "Not in Dutch auction");
        return dutchAuctions[_nftContract][tokenId].erc20token;
    }

    /**
     * @notice Displays the price of a token in a specific ERC20 token, if it is being sold on that token
     * @param _nftContract Contract address of the NFT
     * @param tokenId The id of the token
     */
    function readSalePrice(IERC721 _nftContract, uint256 tokenId, address _erc20token) public view returns (uint){
        require(isBeingSold(_nftContract, tokenId), "Not for sale");
        bool found;
        for (uint i = 0; i < getSalePricesLength(_nftContract, tokenId); i++) {
            Price memory price = getSalePrice(_nftContract, tokenId, i);
            if (_erc20token == price.erc20Contract) {
                return price.price;
            }
        }
        revert("Item is not for sale for this ERC20 token");
    }

    /**
     * @notice Checks if a specific tokenid is for sale at the moment
     * @param _nftContract Contract address of the NFT
     * @param _tokenId The id of the token
     */
    function isBeingSold(IERC721 _nftContract, uint _tokenId) public view returns (bool) {
        return sales[_nftContract][_tokenId].owner != address(0);
    }
    /**
     * @notice Checks if a specific _tokenId is being auctioned on an English auction at the moment
     * @param _nftContract Contract address of the NFT
     * @param _tokenId The id of the token
     */
    function isInEnglishAuction(IERC721 _nftContract, uint _tokenId) public view returns (bool) {
        return englishAuctions[_nftContract][_tokenId].owner != address(0);
    }
    /**
     * @notice Checks if a specific _tokenId is being auctioned on a Dutch auction at the moment
     Start and end dates do not interfere with the status.
     * @param _nftContract Contract address of the NFT
     * @param _tokenId The id of the token
     */
    function isInDutchAuction(IERC721 _nftContract, uint _tokenId) public view returns (bool) {
        return dutchAuctions[_nftContract][_tokenId].owner != address(0);
    }

    /**
     * @notice Checks if a specific _tokenId is being sold or actioned at the moment
     * @param _nftContract Contract address of the NFT
     * @param _tokenId The id of the token
     */
    function isBeingSoldOrAuctioned(IERC721 _nftContract, uint _tokenId) public view returns (bool) {
        return (
            isBeingSold(_nftContract, _tokenId) ||
            isInEnglishAuction(_nftContract, _tokenId) ||
            isInDutchAuction(_nftContract, _tokenId)
        );
    }

    function _addWithdrawable(
        address beneficiary,
        address _erc20Contract,
        uint256 amount
    ) private {
        uint256 feeAmount = (amount * fee) / 10000;
        uint256 newAmount = amount - feeAmount;
        withdrawable[beneficiary][_erc20Contract] += newAmount;
        withdrawable[owner()][_erc20Contract] += feeAmount;
    }

    function _deleteEnglishAuction(IERC721 _nftContract, uint256 _tokenId) private {
        delete englishAuctions[_nftContract][_tokenId].owner;
        delete englishAuctions[_nftContract][_tokenId].minPrice;
        delete englishAuctions[_nftContract][_tokenId].bidder;
        delete englishAuctions[_nftContract][_tokenId].amount;
        delete englishAuctions[_nftContract][_tokenId].closeTime;
        delete englishAuctions[_nftContract][_tokenId].timeIncrease;
    }

    function _deleteDutchAuction(IERC721 _nftContract, uint256 _tokenId) private {
        delete dutchAuctions[_nftContract][_tokenId].owner;
        delete dutchAuctions[_nftContract][_tokenId].startPrice;
        delete dutchAuctions[_nftContract][_tokenId].endPrice;
        delete dutchAuctions[_nftContract][_tokenId].start;
        delete dutchAuctions[_nftContract][_tokenId].end;
    }

    /**
     * @notice Calculates the drop in price per second of an NFT being dutch auctioned.
     * Important: returns a positive value
     * @param _nftContract Contract address of the NFT
     * @param _tokenId    TokenId that is in dutch auction for which to calculate the drop in price
     */
    function _priceDropPerSecondForDutchAuction(IERC721 _nftContract, uint256 _tokenId)
    internal
    returns (uint256){

        return (dutchAuctions[_nftContract][_tokenId].startPrice - dutchAuctions[_nftContract][_tokenId].endPrice) /
        (dutchAuctions[_nftContract][_tokenId].end - dutchAuctions[_nftContract][_tokenId].start);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)

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
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

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

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

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

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

    /**
     * @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
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

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() {
        _transferOwnership(_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 {
        _transferOwnership(address(0));
    }

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

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

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

pragma solidity ^0.8.0;

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

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

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

• No Contract Security Audit Submitted- Submit Audit Here

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