// SPDX-License-Identifier: LGPL-3.0-only
// Created By: Art Blocks Inc.
import "../interfaces/0.8.x/IGenArt721CoreContractV1.sol";
import "../interfaces/0.8.x/IMinterFilterV0.sol";
import "../interfaces/0.8.x/IFilteredMinterV0.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
pragma solidity 0.8.9;
/**
 * @title Filtered Minter contract that allows tokens to be minted with ETH.
 * Pricing is achieved using an automated Dutch-auction mechanism.
 * @author Art Blocks Inc.
 */
contract MinterDAExpV1 is ReentrancyGuard, IFilteredMinterV0 {
    /// Auction details updated for project `projectId`.
    event SetAuctionDetails(
        uint256 indexed projectId,
        uint256 _auctionTimestampStart,
        uint256 _priceDecayHalfLifeSeconds,
        uint256 _startPrice,
        uint256 _basePrice
    );
    /// Auction details cleared for project `projectId`.
    event ResetAuctionDetails(uint256 indexed projectId);
    /// Maximum and minimum allowed price decay half lifes updated.
    event AuctionHalfLifeRangeSecondsUpdated(
        uint256 _minimumPriceDecayHalfLifeSeconds,
        uint256 _maximumPriceDecayHalfLifeSeconds
    );
    /// Core contract address this minter interacts with
    address public immutable genArt721CoreAddress;
    /// This contract handles cores with interface IV1
    IGenArt721CoreContractV1 private immutable genArtCoreContract;
    /// Minter filter address this minter interacts with
    address public immutable minterFilterAddress;
    /// Minter filter this minter may interact with.
    IMinterFilterV0 private immutable minterFilter;
    /// minterType for this minter
    string public constant minterType = "MinterDAExpV1";
    uint256 constant ONE_MILLION = 1_000_000;
    /// projectId => has project reached its maximum number of invocations?
    mapping(uint256 => bool) public projectMaxHasBeenInvoked;
    /// projectId => project's maximum number of invocations
    mapping(uint256 => uint256) public projectMaxInvocations;
    /// Minimum price decay half life: price must decay with a half life of at
    /// least this amount (must cut in half at least every N seconds).
    uint256 public minimumPriceDecayHalfLifeSeconds = 300; // 5 minutes
    /// Maximum price decay half life: price may decay with a half life of no
    /// more than this amount (may cut in half at no more than every N seconds).
    uint256 public maximumPriceDecayHalfLifeSeconds = 3600; // 60 minutes
    /// projectId => auction parameters
    mapping(uint256 => AuctionParameters) public projectAuctionParameters;
    struct AuctionParameters {
        uint256 timestampStart;
        uint256 priceDecayHalfLifeSeconds;
        uint256 startPrice;
        uint256 basePrice;
    }
    modifier onlyCoreWhitelisted() {
        require(
            genArtCoreContract.isWhitelisted(msg.sender),
            "Only Core whitelisted"
        );
        _;
    }
    modifier onlyArtist(uint256 _projectId) {
        require(
            (msg.sender ==
                genArtCoreContract.projectIdToArtistAddress(_projectId)),
            "Only Artist"
        );
        _;
    }
    /**
     * @notice Initializes contract to be a Filtered Minter for
     * `_minterFilter`, integrated with Art Blocks core contract
     * at address `_genArt721Address`.
     * @param _genArt721Address Art Blocks core contract address for
     * which this contract will be a minter.
     * @param _minterFilter Minter filter for which
     * this will a filtered minter.
     */
    constructor(address _genArt721Address, address _minterFilter)
        ReentrancyGuard()
    {
        genArt721CoreAddress = _genArt721Address;
        genArtCoreContract = IGenArt721CoreContractV1(_genArt721Address);
        minterFilterAddress = _minterFilter;
        minterFilter = IMinterFilterV0(_minterFilter);
        require(
            minterFilter.genArt721CoreAddress() == _genArt721Address,
            "Illegal contract pairing"
        );
    }
    /**
     * @notice Sets the maximum invocations of project `_projectId` based
     * on the value currently defined in the core contract.
     * @param _projectId Project ID to set the maximum invocations for.
     * @dev also checks and may refresh projectMaxHasBeenInvoked for project
     * @dev this enables gas reduction after maxInvocations have been reached -
     * core contracts shall still enforce a maxInvocation check during mint.
     */
    function setProjectMaxInvocations(uint256 _projectId)
        external
        onlyCoreWhitelisted
    {
        uint256 invocations;
        uint256 maxInvocations;
        (, , invocations, maxInvocations, , , , , ) = genArtCoreContract
            .projectTokenInfo(_projectId);
        // update storage with results
        projectMaxInvocations[_projectId] = maxInvocations;
        if (invocations < maxInvocations) {
            projectMaxHasBeenInvoked[_projectId] = false;
        }
    }
    /**
     * @notice Warning: Disabling purchaseTo is not supported on this minter.
     * This method exists purely for interface-conformance purposes.
     */
    function togglePurchaseToDisabled(uint256 _projectId)
        external
        view
        onlyArtist(_projectId)
    {
        revert("Action not supported");
    }
    /**
     * @notice Sets the minimum and maximum values that are settable for
     * `_priceDecayHalfLifeSeconds` across all projects.
     * @param _minimumPriceDecayHalfLifeSeconds Minimum price decay half life
     * (in seconds).
     * @param _maximumPriceDecayHalfLifeSeconds Maximum price decay half life
     * (in seconds).
     */
    function setAllowablePriceDecayHalfLifeRangeSeconds(
        uint256 _minimumPriceDecayHalfLifeSeconds,
        uint256 _maximumPriceDecayHalfLifeSeconds
    ) external onlyCoreWhitelisted {
        require(
            _maximumPriceDecayHalfLifeSeconds >
                _minimumPriceDecayHalfLifeSeconds,
            "Maximum half life must be greater than minimum"
        );
        require(
            _minimumPriceDecayHalfLifeSeconds > 0,
            "Half life of zero not allowed"
        );
        minimumPriceDecayHalfLifeSeconds = _minimumPriceDecayHalfLifeSeconds;
        maximumPriceDecayHalfLifeSeconds = _maximumPriceDecayHalfLifeSeconds;
        emit AuctionHalfLifeRangeSecondsUpdated(
            _minimumPriceDecayHalfLifeSeconds,
            _maximumPriceDecayHalfLifeSeconds
        );
    }
    ////// Auction Functions
    /**
     * @notice Sets auction details for project `_projectId`.
     * @param _projectId Project ID to set auction details for.
     * @param _auctionTimestampStart Timestamp at which to start the auction.
     * @param _priceDecayHalfLifeSeconds The half life with which to decay the
     *  price (in seconds).
     * @param _startPrice Price at which to start the auction, in Wei.
     * @param _basePrice Resting price of the auction, in Wei.
     */
    function setAuctionDetails(
        uint256 _projectId,
        uint256 _auctionTimestampStart,
        uint256 _priceDecayHalfLifeSeconds,
        uint256 _startPrice,
        uint256 _basePrice
    ) external onlyArtist(_projectId) {
        AuctionParameters memory auctionParams = projectAuctionParameters[
            _projectId
        ];
        require(
            auctionParams.timestampStart == 0 ||
                block.timestamp < auctionParams.timestampStart,
            "No modifications mid-auction"
        );
        require(
            block.timestamp < _auctionTimestampStart,
            "Only future auctions"
        );
        require(
            _startPrice > _basePrice,
            "Auction start price must be greater than auction end price"
        );
        require(
            (_priceDecayHalfLifeSeconds >= minimumPriceDecayHalfLifeSeconds) &&
                (_priceDecayHalfLifeSeconds <=
                    maximumPriceDecayHalfLifeSeconds),
            "Price decay half life must fall between min and max allowable values"
        );
        projectAuctionParameters[_projectId] = AuctionParameters(
            _auctionTimestampStart,
            _priceDecayHalfLifeSeconds,
            _startPrice,
            _basePrice
        );
        emit SetAuctionDetails(
            _projectId,
            _auctionTimestampStart,
            _priceDecayHalfLifeSeconds,
            _startPrice,
            _basePrice
        );
    }
    /**
     * @notice Resets auction details for project `_projectId`, zero-ing out all
     * relevant auction fields. Not intended to be used in normal auction
     * operation, but rather only in case of the need to halt an auction.
     * @param _projectId Project ID to set auction details for.
     */
    function resetAuctionDetails(uint256 _projectId)
        external
        onlyCoreWhitelisted
    {
        delete projectAuctionParameters[_projectId];
        emit ResetAuctionDetails(_projectId);
    }
    /**
     * @notice Purchases a token from project `_projectId`.
     * @param _projectId Project ID to mint a token on.
     * @return tokenId Token ID of minted token
     */
    function purchase(uint256 _projectId)
        external
        payable
        returns (uint256 tokenId)
    {
        tokenId = purchaseTo(msg.sender, _projectId);
        return tokenId;
    }
    /**
     * @notice Purchases a token from project `_projectId` and sets
     * the token's owner to `_to`.
     * @param _to Address to be the new token's owner.
     * @param _projectId Project ID to mint a token on.
     * @return tokenId Token ID of minted token
     */
    function purchaseTo(address _to, uint256 _projectId)
        public
        payable
        nonReentrant
        returns (uint256 tokenId)
    {
        // CHECKS
        require(
            !projectMaxHasBeenInvoked[_projectId],
            "Maximum number of invocations reached"
        );
        // _getPrice reverts if auction is unconfigured or has not started
        uint256 currentPriceInWei = _getPrice(_projectId);
        require(
            msg.value >= currentPriceInWei,
            "Must send minimum value to mint!"
        );
        // EFFECTS
        tokenId = minterFilter.mint(_to, _projectId, msg.sender);
        // what if projectMaxInvocations[_projectId] is 0 (default value)?
        // that is intended, so that by default the minter allows infinite transactions,
        // allowing the artblocks contract to stop minting
        // uint256 tokenInvocation = tokenId % ONE_MILLION;
        if (
            projectMaxInvocations[_projectId] > 0 &&
            tokenId % ONE_MILLION == projectMaxInvocations[_projectId] - 1
        ) {
            projectMaxHasBeenInvoked[_projectId] = true;
        }
        // INTERACTIONS
        _splitFundsETHAuction(_projectId, currentPriceInWei);
        return tokenId;
    }
    /**
     * @dev splits ETH funds between sender (if refund), foundation,
     * artist, and artist's additional payee for a token purchased on
     * project `_projectId`.
     * @dev utilizes transfer() to send ETH, which may fail if access
     * lists are not properly populated when purchasing tokens.
     * @param _projectId Project ID for which funds shall be split.
     * @param _currentPriceInWei Current price of token, in Wei.
     */
    function _splitFundsETHAuction(
        uint256 _projectId,
        uint256 _currentPriceInWei
    ) internal {
        if (msg.value > 0) {
            uint256 refund = msg.value - _currentPriceInWei;
            if (refund > 0) {
                (bool success_, ) = msg.sender.call{value: refund}("");
                require(success_, "Refund failed");
            }
            uint256 foundationAmount = (_currentPriceInWei *
                genArtCoreContract.artblocksPercentage()) / 100;
            if (foundationAmount > 0) {
                (bool success_, ) = genArtCoreContract.artblocksAddress().call{
                    value: foundationAmount
                }("");
                require(success_, "Foundation payment failed");
            }
            uint256 projectFunds = _currentPriceInWei - foundationAmount;
            uint256 additionalPayeeAmount;
            if (
                genArtCoreContract.projectIdToAdditionalPayeePercentage(
                    _projectId
                ) > 0
            ) {
                additionalPayeeAmount =
                    (projectFunds *
                        genArtCoreContract.projectIdToAdditionalPayeePercentage(
                            _projectId
                        )) /
                    100;
                if (additionalPayeeAmount > 0) {
                    (bool success_, ) = genArtCoreContract
                        .projectIdToAdditionalPayee(_projectId)
                        .call{value: additionalPayeeAmount}("");
                    require(success_, "Additional payment failed");
                }
            }
            uint256 creatorFunds = projectFunds - additionalPayeeAmount;
            if (creatorFunds > 0) {
                (bool success_, ) = genArtCoreContract
                    .projectIdToArtistAddress(_projectId)
                    .call{value: creatorFunds}("");
                require(success_, "Artist payment failed");
            }
        }
    }
    /**
     * @notice Gets price of minting a token on project `_projectId` given
     * the project's AuctionParameters and current block timestamp.
     * Reverts if auction has not yet started or auction is unconfigured.
     * @param _projectId Project ID to get price of token for.
     * @return current price of token in Wei
     * @dev This method calculates price decay using a linear interpolation
     * of exponential decay based on the artist-provided half-life for price
     * decay, `_priceDecayHalfLifeSeconds`.
     */
    function _getPrice(uint256 _projectId) private view returns (uint256) {
        AuctionParameters memory auctionParams = projectAuctionParameters[
            _projectId
        ];
        require(
            block.timestamp > auctionParams.timestampStart,
            "Auction not yet started"
        );
        require(
            auctionParams.priceDecayHalfLifeSeconds > 0,
            "Only configured auctions"
        );
        uint256 decayedPrice = auctionParams.startPrice;
        uint256 elapsedTimeSeconds = block.timestamp -
            auctionParams.timestampStart;
        // Divide by two (via bit-shifting) for the number of entirely completed
        // half-lives that have elapsed since auction start time.
        decayedPrice >>=
            elapsedTimeSeconds /
            auctionParams.priceDecayHalfLifeSeconds;
        // Perform a linear interpolation between partial half-life points, to
        // approximate the current place on a perfect exponential decay curve.
        decayedPrice -=
            (decayedPrice *
                (elapsedTimeSeconds %
                    auctionParams.priceDecayHalfLifeSeconds)) /
            auctionParams.priceDecayHalfLifeSeconds /
            2;
        if (decayedPrice < auctionParams.basePrice) {
            // Price may not decay below stay `basePrice`.
            return auctionParams.basePrice;
        }
        return decayedPrice;
    }
    /**
     * @notice Gets if price of token is configured, price of minting a
     * token on project `_projectId`, and currency symbol and address to be
     * used as payment. Supersedes any core contract price information.
     * @param _projectId Project ID to get price information for.
     * @return isConfigured true only if project's auction parameters have been
     * configured on this minter
     * @return tokenPriceInWei current price of token on this minter - invalid
     * if auction has not yet been configured
     * @return currencySymbol currency symbol for purchases of project on this
     * minter. This minter always returns "ETH"
     * @return currencyAddress currency address for purchases of project on
     * this minter. This minter always returns null address, reserved for ether
     */
    function getPriceInfo(uint256 _projectId)
        external
        view
        returns (
            bool isConfigured,
            uint256 tokenPriceInWei,
            string memory currencySymbol,
            address currencyAddress
        )
    {
        AuctionParameters memory auctionParams = projectAuctionParameters[
            _projectId
        ];
        isConfigured = (auctionParams.startPrice > 0);
        if (block.timestamp <= auctionParams.timestampStart) {
            // Provide a reasonable value for `tokenPriceInWei` when it would
            // otherwise revert, using the starting price before auction starts.
            tokenPriceInWei = auctionParams.startPrice;
        } else if (auctionParams.startPrice == 0) {
            // In the case of unconfigured auction, return price of zero when
            // it would otherwise revert
            tokenPriceInWei = 0;
        } else {
            tokenPriceInWei = _getPrice(_projectId);
        }
        currencySymbol = "ETH";
        currencyAddress = address(0);
    }
}
// SPDX-License-Identifier: LGPL-3.0-only
// Created By: Art Blocks Inc.
pragma solidity ^0.8.0;
interface IGenArt721CoreContractV1 {
    event Mint(
        address indexed _to,
        uint256 indexed _tokenId,
        uint256 indexed _projectId
    );
    // getter function of public variable
    function admin() external view returns (address);
    // getter function of public variable
    function nextProjectId() external view returns (uint256);
    // getter function of public mapping
    function tokenIdToProjectId(uint256 tokenId)
        external
        view
        returns (uint256 projectId);
    function isWhitelisted(address sender) external view returns (bool);
    // @dev this is not available in V0
    function isMintWhitelisted(address minter) external view returns (bool);
    function projectIdToArtistAddress(uint256 _projectId)
        external
        view
        returns (address payable);
    function projectIdToAdditionalPayee(uint256 _projectId)
        external
        view
        returns (address payable);
    function projectIdToAdditionalPayeePercentage(uint256 _projectId)
        external
        view
        returns (uint256);
    function projectTokenInfo(uint256 _projectId)
        external
        view
        returns (
            address,
            uint256,
            uint256,
            uint256,
            bool,
            address,
            uint256,
            string memory,
            address
        );
    function artblocksAddress() external view returns (address payable);
    function artblocksPercentage() external view returns (uint256);
    function mint(
        address _to,
        uint256 _projectId,
        address _by
    ) external returns (uint256 tokenId);
    function getRoyaltyData(uint256 _tokenId)
        external
        view
        returns (
            address artistAddress,
            address additionalPayee,
            uint256 additionalPayeePercentage,
            uint256 royaltyFeeByID
        );
}
// SPDX-License-Identifier: LGPL-3.0-only
// Created By: Art Blocks Inc.
pragma solidity ^0.8.0;
interface IMinterFilterV0 {
    /**
     * @notice Approved minter `_minterAddress`.
     */
    event MinterApproved(address indexed _minterAddress, string _minterType);
    /**
     * @notice Revoked approval for minter `_minterAddress`
     */
    event MinterRevoked(address indexed _minterAddress);
    /**
     * @notice Minter `_minterAddress` of type `_minterType`
     * registered for project `_projectId`.
     */
    event ProjectMinterRegistered(
        uint256 indexed _projectId,
        address indexed _minterAddress,
        string _minterType
    );
    /**
     * @notice Any active minter removed for project `_projectId`.
     */
    event ProjectMinterRemoved(uint256 indexed _projectId);
    function genArt721CoreAddress() external returns (address);
    function setMinterForProject(uint256, address) external;
    function removeMinterForProject(uint256) external;
    function mint(
        address _to,
        uint256 _projectId,
        address sender
    ) external returns (uint256);
    function getMinterForProject(uint256) external view returns (address);
    function projectHasMinter(uint256) external view returns (bool);
}
// SPDX-License-Identifier: LGPL-3.0-only
// Created By: Art Blocks Inc.
pragma solidity ^0.8.0;
interface IFilteredMinterV0 {
    /**
     * @notice Price per token in wei updated for project `_projectId` to
     * `_pricePerTokenInWei`.
     */
    event PricePerTokenInWeiUpdated(
        uint256 indexed _projectId,
        uint256 indexed _pricePerTokenInWei
    );
    /**
     * @notice Currency updated for project `_projectId` to symbol
     * `_currencySymbol` and address `_currencyAddress`.
     */
    event ProjectCurrencyInfoUpdated(
        uint256 indexed _projectId,
        address indexed _currencyAddress,
        string _currencySymbol
    );
    /// togglePurchaseToDisabled updated
    event PurchaseToDisabledUpdated(
        uint256 indexed _projectId,
        bool _purchaseToDisabled
    );
    // getter function of public variable
    function minterType() external view returns (string memory);
    function genArt721CoreAddress() external returns (address);
    function minterFilterAddress() external returns (address);
    // Triggers a purchase of a token from the desired project, to the
    // TX-sending address.
    function purchase(uint256 _projectId)
        external
        payable
        returns (uint256 tokenId);
    // Triggers a purchase of a token from the desired project, to the specified
    // receiving address.
    function purchaseTo(address _to, uint256 _projectId)
        external
        payable
        returns (uint256 tokenId);
    // Toggles the ability for `purchaseTo` to be called directly with a
    // specified receiving address that differs from the TX-sending address.
    function togglePurchaseToDisabled(uint256 _projectId) external;
    // Called to make the minter contract aware of the max invocations for a
    // given project.
    function setProjectMaxInvocations(uint256 _projectId) external;
    // Gets if token price is configured, token price in wei, currency symbol,
    // and currency address, assuming this is project's minter.
    // Supersedes any defined core price.
    function getPriceInfo(uint256 _projectId)
        external
        view
        returns (
            bool isConfigured,
            uint256 tokenPriceInWei,
            string memory currencySymbol,
            address currencyAddress
        );
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)
pragma solidity ^0.8.0;
/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.
    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;
    uint256 private _status;
    constructor() {
        _status = _NOT_ENTERED;
    }
    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
        _;
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
// Created By: Art Blocks Inc.
import "../interfaces/0.8.x/IMinterFilterV0.sol";
import "../interfaces/0.8.x/IFilteredMinterV0.sol";
import "../interfaces/0.8.x/IGenArt721CoreContractV1.sol";
import "@openzeppelin/contracts/utils/structs/EnumerableMap.sol";
pragma solidity 0.8.9;
/**
 * @title Minter filter contract that allows filtered minters to be set
 * on a per-project basis.
 * @author Art Blocks Inc.
 */
contract MinterFilterV0 is IMinterFilterV0 {
    /**
     * @notice This minter is to be considered `_coreContractAddress`'s
     * canonical minter.
     * @dev may be vestigial after migrating to V3 core contracts
     */
    event IsCanonicalMinterFilter(address indexed _coreContractAddress);
    // add Enumerable Map methods
    using EnumerableMap for EnumerableMap.UintToAddressMap;
    /// Core contract address this minter interacts with
    address public immutable genArt721CoreAddress;
    /// This contract only uses the portion of V3 interface also on V1 core
    IGenArt721CoreContractV1 private immutable genArtCoreContract;
    /// projectId => minter address
    EnumerableMap.UintToAddressMap private minterForProject;
    /// minter address => qty projects currently using minter
    mapping(address => uint256) public numProjectsUsingMinter;
    /// minter address => is an approved minter?
    mapping(address => bool) public isApprovedMinter;
    modifier onlyCoreWhitelisted() {
        require(
            genArtCoreContract.isWhitelisted(msg.sender),
            "Only Core whitelisted"
        );
        _;
    }
    modifier onlyCoreWhitelistedOrArtist(uint256 _projectId) {
        require(
            (genArtCoreContract.isWhitelisted(msg.sender) ||
                msg.sender ==
                genArtCoreContract.projectIdToArtistAddress(_projectId)),
            "Only Core whitelisted or Artist"
        );
        _;
    }
    modifier projectExists(uint256 _projectId) {
        require(
            _projectId < genArtCoreContract.nextProjectId(),
            "Only existing projects"
        );
        _;
    }
    modifier usingApprovedMinter(address _minterAddress) {
        require(
            isApprovedMinter[_minterAddress],
            "Only approved minters are allowed"
        );
        _;
    }
    modifier onlyMintWhitelisted() {
        require(
            genArtCoreContract.isMintWhitelisted(address(this)),
            "Only mint allowlisted"
        );
        _;
    }
    /**
     * @notice Initializes contract to be a Minter for `_genArt721Address`.
     * @param _genArt721Address Art Blocks core contract address
     * this contract will be a minter for. Can never be updated.
     */
    constructor(address _genArt721Address) {
        genArt721CoreAddress = _genArt721Address;
        genArtCoreContract = IGenArt721CoreContractV1(_genArt721Address);
    }
    /**
     * @notice Emits event notifying indexers that this is core contract's
     * canonical minter filter.
     * @dev may be vestigial after migrating to V3 core contracts
     */
    function alertAsCanonicalMinterFilter()
        external
        onlyCoreWhitelisted
        onlyMintWhitelisted
    {
        emit IsCanonicalMinterFilter(genArt721CoreAddress);
    }
    /**
     * @notice Approves minter `_minterAddress`.
     * @param _minterAddress Minter to be added as an approved minter.
     */
    function addApprovedMinter(address _minterAddress)
        external
        onlyCoreWhitelisted
    {
        isApprovedMinter[_minterAddress] = true;
        emit MinterApproved(
            _minterAddress,
            IFilteredMinterV0(_minterAddress).minterType()
        );
    }
    /**
     * @notice Removes previously approved minter `_minterAddress`.
     * @param _minterAddress Minter to remove.
     */
    function removeApprovedMinter(address _minterAddress)
        external
        onlyCoreWhitelisted
    {
        require(
            numProjectsUsingMinter[_minterAddress] == 0,
            "Only unused minters"
        );
        isApprovedMinter[_minterAddress] = false;
        emit MinterRevoked(_minterAddress);
    }
    /**
     * @notice Sets minter for project `_projectId` to minter
     * `_minterAddress`.
     * @param _projectId Project ID to set minter for.
     * @param _minterAddress Minter to be the project's minter.
     */
    function setMinterForProject(uint256 _projectId, address _minterAddress)
        external
        onlyCoreWhitelistedOrArtist(_projectId)
        usingApprovedMinter(_minterAddress)
        projectExists(_projectId)
    {
        // decrement number of projects using a previous minter
        (bool hasPreviousMinter, address previousMinter) = minterForProject
            .tryGet(_projectId);
        if (hasPreviousMinter) {
            numProjectsUsingMinter[previousMinter]--;
        }
        // add new minter
        numProjectsUsingMinter[_minterAddress]++;
        minterForProject.set(_projectId, _minterAddress);
        emit ProjectMinterRegistered(
            _projectId,
            _minterAddress,
            IFilteredMinterV0(_minterAddress).minterType()
        );
    }
    /**
     * @notice Updates project `_projectId` to have no configured minter.
     * @param _projectId Project ID to remove minter.
     * @dev requires project to have an assigned minter
     */
    function removeMinterForProject(uint256 _projectId)
        external
        onlyCoreWhitelistedOrArtist(_projectId)
    {
        _removeMinterForProject(_projectId);
    }
    /**
     * @notice Updates an array of project IDs to have no configured minter.
     * @param _projectIds Array of project IDs to remove minters for.
     * @dev requires all project IDs to have an assigned minter
     * @dev caution with respect to single tx gas limits
     */
    function removeMintersForProjects(uint256[] calldata _projectIds)
        external
        onlyCoreWhitelisted
    {
        uint256 numProjects = _projectIds.length;
        for (uint256 i; i < numProjects; i++) {
            _removeMinterForProject(_projectIds[i]);
        }
    }
    /**
     * @notice Updates project `_projectId` to have no configured minter
     * (reverts tx if project does not have an assigned minter).
     * @param _projectId Project ID to remove minter.
     */
    function _removeMinterForProject(uint256 _projectId) private {
        // remove minter for project and emit
        // `minterForProject.get()` reverts tx if no minter set for project
        numProjectsUsingMinter[minterForProject.get(_projectId)]--;
        minterForProject.remove(_projectId);
        emit ProjectMinterRemoved(_projectId);
    }
    /**
     * @notice Mint a token from project `_projectId` to `_to`, originally
     * purchased by `sender`.
     * @param _to The new token's owner.
     * @param _projectId Project ID to mint a new token on.
     * @param sender Address purchasing a new token.
     * @return _tokenId Token ID of minted token
     * @dev reverts w/nonexistent key error when project has no assigned minter
     */
    function mint(
        address _to,
        uint256 _projectId,
        address sender
    ) external returns (uint256 _tokenId) {
        // CHECKS
        // minter is the project's minter
        require(
            msg.sender == minterForProject.get(_projectId),
            "Only assigned minter"
        );
        // EFFECTS
        uint256 tokenId = genArtCoreContract.mint(_to, _projectId, sender);
        return tokenId;
    }
    /**
     * @notice Gets the assigned minter for project `_projectId`.
     * @param _projectId Project ID to query.
     * @return address Minter address assigned to project `_projectId`
     * @dev requires project to have an assigned minter
     */
    function getMinterForProject(uint256 _projectId)
        external
        view
        returns (address)
    {
        (bool _hasMinter, address _currentMinter) = minterForProject.tryGet(
            _projectId
        );
        require(_hasMinter, "No minter assigned");
        return _currentMinter;
    }
    /**
     * @notice Queries if project `_projectId` has an assigned minter.
     * @param _projectId Project ID to query.
     * @return bool true if project has an assigned minter, else false
     * @dev requires project to have an assigned minter
     */
    function projectHasMinter(uint256 _projectId) external view returns (bool) {
        (bool _hasMinter, ) = minterForProject.tryGet(_projectId);
        return _hasMinter;
    }
    /**
     * @notice Gets quantity of projects that have assigned minters.
     * @return uint256 quantity of projects that have assigned minters
     */
    function getNumProjectsWithMinters() external view returns (uint256) {
        return minterForProject.length();
    }
    /**
     * @notice Get project ID and minter address at index `_index` of
     * enumerable map.
     * @param _index enumerable map index to query.
     * @return projectId project ID at index `_index`
     * @return minterAddress minter address for project at index `_index`
     * @return minterType minter type of minter at minterAddress
     * @dev index must be < quantity of projects that have assigned minters
     */
    function getProjectAndMinterInfoAt(uint256 _index)
        external
        view
        returns (
            uint256 projectId,
            address minterAddress,
            string memory minterType
        )
    {
        (projectId, minterAddress) = minterForProject.at(_index);
        minterType = IFilteredMinterV0(minterAddress).minterType();
        return (projectId, minterAddress, minterType);
    }
}
// SPDX-License-Identifier: LGPL-3.0-only
// Created By: Art Blocks Inc.
pragma solidity ^0.8.0;
interface IMinterFilterV0 {
    /**
     * @notice Approved minter `_minterAddress`.
     */
    event MinterApproved(address indexed _minterAddress, string _minterType);
    /**
     * @notice Revoked approval for minter `_minterAddress`
     */
    event MinterRevoked(address indexed _minterAddress);
    /**
     * @notice Minter `_minterAddress` of type `_minterType`
     * registered for project `_projectId`.
     */
    event ProjectMinterRegistered(
        uint256 indexed _projectId,
        address indexed _minterAddress,
        string _minterType
    );
    /**
     * @notice Any active minter removed for project `_projectId`.
     */
    event ProjectMinterRemoved(uint256 indexed _projectId);
    function genArt721CoreAddress() external returns (address);
    function setMinterForProject(uint256, address) external;
    function removeMinterForProject(uint256) external;
    function mint(
        address _to,
        uint256 _projectId,
        address sender
    ) external returns (uint256);
    function getMinterForProject(uint256) external view returns (address);
    function projectHasMinter(uint256) external view returns (bool);
}
// SPDX-License-Identifier: LGPL-3.0-only
// Created By: Art Blocks Inc.
pragma solidity ^0.8.0;
interface IFilteredMinterV0 {
    /**
     * @notice Price per token in wei updated for project `_projectId` to
     * `_pricePerTokenInWei`.
     */
    event PricePerTokenInWeiUpdated(
        uint256 indexed _projectId,
        uint256 indexed _pricePerTokenInWei
    );
    /**
     * @notice Currency updated for project `_projectId` to symbol
     * `_currencySymbol` and address `_currencyAddress`.
     */
    event ProjectCurrencyInfoUpdated(
        uint256 indexed _projectId,
        address indexed _currencyAddress,
        string _currencySymbol
    );
    /// togglePurchaseToDisabled updated
    event PurchaseToDisabledUpdated(
        uint256 indexed _projectId,
        bool _purchaseToDisabled
    );
    // getter function of public variable
    function minterType() external view returns (string memory);
    function genArt721CoreAddress() external returns (address);
    function minterFilterAddress() external returns (address);
    // Triggers a purchase of a token from the desired project, to the
    // TX-sending address.
    function purchase(uint256 _projectId)
        external
        payable
        returns (uint256 tokenId);
    // Triggers a purchase of a token from the desired project, to the specified
    // receiving address.
    function purchaseTo(address _to, uint256 _projectId)
        external
        payable
        returns (uint256 tokenId);
    // Toggles the ability for `purchaseTo` to be called directly with a
    // specified receiving address that differs from the TX-sending address.
    function togglePurchaseToDisabled(uint256 _projectId) external;
    // Called to make the minter contract aware of the max invocations for a
    // given project.
    function setProjectMaxInvocations(uint256 _projectId) external;
    // Gets if token price is configured, token price in wei, currency symbol,
    // and currency address, assuming this is project's minter.
    // Supersedes any defined core price.
    function getPriceInfo(uint256 _projectId)
        external
        view
        returns (
            bool isConfigured,
            uint256 tokenPriceInWei,
            string memory currencySymbol,
            address currencyAddress
        );
}
// SPDX-License-Identifier: LGPL-3.0-only
// Created By: Art Blocks Inc.
pragma solidity ^0.8.0;
interface IGenArt721CoreContractV1 {
    event Mint(
        address indexed _to,
        uint256 indexed _tokenId,
        uint256 indexed _projectId
    );
    // getter function of public variable
    function admin() external view returns (address);
    // getter function of public variable
    function nextProjectId() external view returns (uint256);
    // getter function of public mapping
    function tokenIdToProjectId(uint256 tokenId)
        external
        view
        returns (uint256 projectId);
    function isWhitelisted(address sender) external view returns (bool);
    // @dev this is not available in V0
    function isMintWhitelisted(address minter) external view returns (bool);
    function projectIdToArtistAddress(uint256 _projectId)
        external
        view
        returns (address payable);
    function projectIdToAdditionalPayee(uint256 _projectId)
        external
        view
        returns (address payable);
    function projectIdToAdditionalPayeePercentage(uint256 _projectId)
        external
        view
        returns (uint256);
    function projectTokenInfo(uint256 _projectId)
        external
        view
        returns (
            address,
            uint256,
            uint256,
            uint256,
            bool,
            address,
            uint256,
            string memory,
            address
        );
    function artblocksAddress() external view returns (address payable);
    function artblocksPercentage() external view returns (uint256);
    function mint(
        address _to,
        uint256 _projectId,
        address _by
    ) external returns (uint256 tokenId);
    function getRoyaltyData(uint256 _tokenId)
        external
        view
        returns (
            address artistAddress,
            address additionalPayee,
            uint256 additionalPayeePercentage,
            uint256 royaltyFeeByID
        );
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/structs/EnumerableMap.sol)
pragma solidity ^0.8.0;
import "./EnumerableSet.sol";
/**
 * @dev Library for managing an enumerable variant of Solidity's
 * https://solidity.readthedocs.io/en/latest/types.html#mapping-types[`mapping`]
 * type.
 *
 * Maps have the following properties:
 *
 * - Entries are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Entries are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableMap for EnumerableMap.UintToAddressMap;
 *
 *     // Declare a set state variable
 *     EnumerableMap.UintToAddressMap private myMap;
 * }
 * ```
 *
 * As of v3.0.0, only maps of type `uint256 -> address` (`UintToAddressMap`) are
 * supported.
 */
library EnumerableMap {
    using EnumerableSet for EnumerableSet.Bytes32Set;
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Map type with
    // bytes32 keys and values.
    // The Map implementation uses private functions, and user-facing
    // implementations (such as Uint256ToAddressMap) are just wrappers around
    // the underlying Map.
    // This means that we can only create new EnumerableMaps for types that fit
    // in bytes32.
    struct Map {
        // Storage of keys
        EnumerableSet.Bytes32Set _keys;
        mapping(bytes32 => bytes32) _values;
    }
    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function _set(
        Map storage map,
        bytes32 key,
        bytes32 value
    ) private returns (bool) {
        map._values[key] = value;
        return map._keys.add(key);
    }
    /**
     * @dev Removes a key-value pair from a map. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function _remove(Map storage map, bytes32 key) private returns (bool) {
        delete map._values[key];
        return map._keys.remove(key);
    }
    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function _contains(Map storage map, bytes32 key) private view returns (bool) {
        return map._keys.contains(key);
    }
    /**
     * @dev Returns the number of key-value pairs in the map. O(1).
     */
    function _length(Map storage map) private view returns (uint256) {
        return map._keys.length();
    }
    /**
     * @dev Returns the key-value pair stored at position `index` in the map. O(1).
     *
     * Note that there are no guarantees on the ordering of entries inside the
     * array, and it may change when more entries are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Map storage map, uint256 index) private view returns (bytes32, bytes32) {
        bytes32 key = map._keys.at(index);
        return (key, map._values[key]);
    }
    /**
     * @dev Tries to returns the value associated with `key`.  O(1).
     * Does not revert if `key` is not in the map.
     */
    function _tryGet(Map storage map, bytes32 key) private view returns (bool, bytes32) {
        bytes32 value = map._values[key];
        if (value == bytes32(0)) {
            return (_contains(map, key), bytes32(0));
        } else {
            return (true, value);
        }
    }
    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function _get(Map storage map, bytes32 key) private view returns (bytes32) {
        bytes32 value = map._values[key];
        require(value != 0 || _contains(map, key), "EnumerableMap: nonexistent key");
        return value;
    }
    /**
     * @dev Same as {_get}, with a custom error message when `key` is not in the map.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {_tryGet}.
     */
    function _get(
        Map storage map,
        bytes32 key,
        string memory errorMessage
    ) private view returns (bytes32) {
        bytes32 value = map._values[key];
        require(value != 0 || _contains(map, key), errorMessage);
        return value;
    }
    // UintToAddressMap
    struct UintToAddressMap {
        Map _inner;
    }
    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function set(
        UintToAddressMap storage map,
        uint256 key,
        address value
    ) internal returns (bool) {
        return _set(map._inner, bytes32(key), bytes32(uint256(uint160(value))));
    }
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function remove(UintToAddressMap storage map, uint256 key) internal returns (bool) {
        return _remove(map._inner, bytes32(key));
    }
    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function contains(UintToAddressMap storage map, uint256 key) internal view returns (bool) {
        return _contains(map._inner, bytes32(key));
    }
    /**
     * @dev Returns the number of elements in the map. O(1).
     */
    function length(UintToAddressMap storage map) internal view returns (uint256) {
        return _length(map._inner);
    }
    /**
     * @dev Returns the element stored at position `index` in the set. O(1).
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintToAddressMap storage map, uint256 index) internal view returns (uint256, address) {
        (bytes32 key, bytes32 value) = _at(map._inner, index);
        return (uint256(key), address(uint160(uint256(value))));
    }
    /**
     * @dev Tries to returns the value associated with `key`.  O(1).
     * Does not revert if `key` is not in the map.
     *
     * _Available since v3.4._
     */
    function tryGet(UintToAddressMap storage map, uint256 key) internal view returns (bool, address) {
        (bool success, bytes32 value) = _tryGet(map._inner, bytes32(key));
        return (success, address(uint160(uint256(value))));
    }
    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function get(UintToAddressMap storage map, uint256 key) internal view returns (address) {
        return address(uint160(uint256(_get(map._inner, bytes32(key)))));
    }
    /**
     * @dev Same as {get}, with a custom error message when `key` is not in the map.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryGet}.
     */
    function get(
        UintToAddressMap storage map,
        uint256 key,
        string memory errorMessage
    ) internal view returns (address) {
        return address(uint160(uint256(_get(map._inner, bytes32(key), errorMessage))));
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/structs/EnumerableSet.sol)
pragma solidity ^0.8.0;
/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.
    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];
        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.
            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;
            if (lastIndex != toDeleteIndex) {
                bytes32 lastvalue = set._values[lastIndex];
                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastvalue;
                // Update the index for the moved value
                set._indexes[lastvalue] = valueIndex; // Replace lastvalue's index to valueIndex
            }
            // Delete the slot where the moved value was stored
            set._values.pop();
            // Delete the index for the deleted slot
            delete set._indexes[value];
            return true;
        } else {
            return false;
        }
    }
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }
    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }
    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }
    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }
    // Bytes32Set
    struct Bytes32Set {
        Set _inner;
    }
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }
    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }
    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }
    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        return _values(set._inner);
    }
    // AddressSet
    struct AddressSet {
        Set _inner;
    }
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }
    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }
    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }
    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;
        assembly {
            result := store
        }
        return result;
    }
    // UintSet
    struct UintSet {
        Set _inner;
    }
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }
    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }
    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;
        assembly {
            result := store
        }
        return result;
    }
}

// File contracts/libs/IERC165.sol

// File: openzeppelin-solidity/contracts/introspection/IERC165.sol
pragma solidity ^0.5.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * [EIP](https://eips.ethereum.org/EIPS/eip-165).
 *
 * 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
     * [EIP section](https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified)
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}


// File contracts/libs/ERC165.sol

// File: openzeppelin-solidity/contracts/introspection/ERC165.sol

pragma solidity ^0.5.0;



/**
 * @dev Implementation of the `IERC165` interface.
 *
 * Contracts may inherit from this and call `_registerInterface` to declare
 * their support of an interface.
 */
contract ERC165 is IERC165 {
    /*
     * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
     */
    bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;

    /**
     * @dev Mapping of interface ids to whether or not it's supported.
     */
    mapping(bytes4 => bool) private _supportedInterfaces;

    constructor () internal {
        // Derived contracts need only register support for their own interfaces,
        // we register support for ERC165 itself here
        _registerInterface(_INTERFACE_ID_ERC165);
    }

    /**
     * @dev See `IERC165.supportsInterface`.
     *
     * Time complexity O(1), guaranteed to always use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool) {
        return _supportedInterfaces[interfaceId];
    }

    /**
     * @dev Registers the contract as an implementer of the interface defined by
     * `interfaceId`. Support of the actual ERC165 interface is automatic and
     * registering its interface id is not required.
     *
     * See `IERC165.supportsInterface`.
     *
     * Requirements:
     *
     * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
     */
    function _registerInterface(bytes4 interfaceId) internal {
        require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
        _supportedInterfaces[interfaceId] = true;
    }
}


// File contracts/libs/IERC721.sol

// File: openzeppelin-solidity/contracts/token/ERC721/IERC721.sol

pragma solidity ^0.5.0;



/**
 * @dev Required interface of an ERC721 compliant contract.
 */
contract IERC721 is IERC165 {
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

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

    /**
     * @dev Returns the owner of the NFT specified by `tokenId`.
     */
    function ownerOf(uint256 tokenId) public view returns (address owner);

    /**
     * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
     * another (`to`).
     *
     *
     *
     * Requirements:
     * - `from`, `to` cannot be zero.
     * - `tokenId` must be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this
     * NFT by either `approve` or `setApproveForAll`.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) public;
    /**
     * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
     * another (`to`).
     *
     * Requirements:
     * - If the caller is not `from`, it must be approved to move this NFT by
     * either `approve` or `setApproveForAll`.
     */
    function transferFrom(address from, address to, uint256 tokenId) public;
    function approve(address to, uint256 tokenId) public;
    function getApproved(uint256 tokenId) public view returns (address operator);

    function setApprovalForAll(address operator, bool _approved) public;
    function isApprovedForAll(address owner, address operator) public view returns (bool);


    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public;
}


// File contracts/libs/SafeMath.sol

// File: openzeppelin-solidity/contracts/math/SafeMath.sol

pragma solidity ^0.5.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, "SafeMath: division by zero");
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }
}


// File contracts/libs/Address.sol

// File: openzeppelin-solidity/contracts/utils/Address.sol

pragma solidity ^0.5.0;

/**
 * @dev Collection of functions related to the address type,
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * This test is non-exhaustive, and there may be false-negatives: during the
     * execution of a contract's constructor, its address will be reported as
     * not containing a contract.
     *
     * > It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }
}


// File contracts/libs/Counters.sol

// File: openzeppelin-solidity/contracts/drafts/Counters.sol

pragma solidity ^0.5.0;



/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented or decremented by one. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 * Since it is not possible to overflow a 256 bit integer with increments of one, `increment` can skip the SafeMath
 * overflow check, thereby saving gas. This does assume however correct usage, in that the underlying `_value` is never
 * directly accessed.
 */
library Counters {
    using SafeMath for uint256;

    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

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

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

    function decrement(Counter storage counter) internal {
        counter._value = counter._value.sub(1);
    }
}


// File contracts/libs/IERC721Receiver.sol

// File: openzeppelin-solidity/contracts/token/ERC721/IERC721Receiver.sol

pragma solidity ^0.5.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
contract IERC721Receiver {
    function onERC721Received(address operator, address from, uint256 tokenId, bytes memory data)
    public returns (bytes4);
}


// File contracts/libs/ERC721.sol

// File: openzeppelin-solidity/contracts/token/ERC721/ERC721.sol

pragma solidity ^0.5.0;







/**
 * @title ERC721 Non-Fungible Token Standard basic implementation
 * @dev see https://eips.ethereum.org/EIPS/eip-721
 */
contract ERC721 is ERC165, IERC721 {
    using SafeMath for uint256;
    using Address for address;
    using Counters for Counters.Counter;

    // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
    // which can be also obtained as `IERC721Receiver(0).onERC721Received.selector`
    bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;

    // Mapping from token ID to owner
    mapping (uint256 => address) private _tokenOwner;

    // Mapping from token ID to approved address
    mapping (uint256 => address) private _tokenApprovals;

    // Mapping from owner to number of owned token
    mapping (address => Counters.Counter) private _ownedTokensCount;

    // Mapping from owner to operator approvals
    mapping (address => mapping (address => bool)) private _operatorApprovals;
    
    bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;

    constructor () public {
        // register the supported interfaces to conform to ERC721 via ERC165
        _registerInterface(_INTERFACE_ID_ERC721);
    }


    function balanceOf(address owner) public view returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");

        return _ownedTokensCount[owner].current();
    }

    function ownerOf(uint256 tokenId) public view returns (address) {
        address owner = _tokenOwner[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");

        return owner;
    }

    function approve(address to, uint256 tokenId) public {
        address owner = ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(msg.sender == owner || isApprovedForAll(owner, msg.sender),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _tokenApprovals[tokenId] = to;
        emit Approval(owner, to, tokenId);
    }

    function getApproved(uint256 tokenId) public view returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    function setApprovalForAll(address to, bool approved) public {
        require(to != msg.sender, "ERC721: approve to caller");

        _operatorApprovals[msg.sender][to] = approved;
        emit ApprovalForAll(msg.sender, to, approved);
    }

    function isApprovedForAll(address owner, address operator) public view returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    function transferFrom(address from, address to, uint256 tokenId) public {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(msg.sender, tokenId), "ERC721: transfer caller is not owner nor approved");

        _transferFrom(from, to, tokenId);
    }

    function safeTransferFrom(address from, address to, uint256 tokenId) public {
        safeTransferFrom(from, to, tokenId, "");
    }

    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public {
        transferFrom(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    function _exists(uint256 tokenId) internal view returns (bool) {
        address owner = _tokenOwner[tokenId];
        return owner != address(0);
    }

    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    function _mint(address to, uint256 tokenId) internal {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _tokenOwner[tokenId] = to;
        _ownedTokensCount[to].increment();

        emit Transfer(address(0), to, tokenId);
    }

    function _burn(address owner, uint256 tokenId) internal {
        require(ownerOf(tokenId) == owner, "ERC721: burn of token that is not own");

        _clearApproval(tokenId);

        _ownedTokensCount[owner].decrement();
        _tokenOwner[tokenId] = address(0);

        emit Transfer(owner, address(0), tokenId);
    }

    function _burn(uint256 tokenId) internal {
        _burn(ownerOf(tokenId), tokenId);
    }

    function _transferFrom(address from, address to, uint256 tokenId) internal {
        require(ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _clearApproval(tokenId);

        _ownedTokensCount[from].decrement();
        _ownedTokensCount[to].increment();

        _tokenOwner[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

    function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data)
    internal returns (bool)
    {
        if (!to.isContract()) {
            return true;
        }

        bytes4 retval = IERC721Receiver(to).onERC721Received(msg.sender, from, tokenId, _data);
        return (retval == _ERC721_RECEIVED);
    }

    function _clearApproval(uint256 tokenId) private {
        if (_tokenApprovals[tokenId] != address(0)) {
            _tokenApprovals[tokenId] = address(0);
        }
    }
}


// File contracts/libs/IERC721Enumerable.sol

// File: openzeppelin-solidity/contracts/token/ERC721/IERC721Enumerable.sol

pragma solidity ^0.5.0;



/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
contract IERC721Enumerable is IERC721 {
    function totalSupply() public view returns (uint256);
    function tokenOfOwnerByIndex(address owner, uint256 index) public view returns (uint256 tokenId);

    function tokenByIndex(uint256 index) public view returns (uint256);
}


// File contracts/libs/ERC721Enumerable.sol

// File: openzeppelin-solidity/contracts/token/ERC721/ERC721Enumerable.sol

pragma solidity ^0.5.0;







/**
 * @title ERC-721 Non-Fungible Token with optional enumeration extension logic
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
contract ERC721Enumerable is ERC165, ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => uint256[]) private _ownedTokens;

    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;

    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;

    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;

    /*
     *     bytes4(keccak256('totalSupply()')) == 0x18160ddd
     *     bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) == 0x2f745c59
     *     bytes4(keccak256('tokenByIndex(uint256)')) == 0x4f6ccce7
     *
     *     => 0x18160ddd ^ 0x2f745c59 ^ 0x4f6ccce7 == 0x780e9d63
     */
    bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63;

    /**
     * @dev Constructor function.
     */
    constructor () public {
        // register the supported interface to conform to ERC721Enumerable via ERC165
        _registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE);
    }

    /**
     * @dev Gets the token ID at a given index of the tokens list of the requested owner.
     * @param owner address owning the tokens list to be accessed
     * @param index uint256 representing the index to be accessed of the requested tokens list
     * @return uint256 token ID at the given index of the tokens list owned by the requested address
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view returns (uint256) {
        require(index < balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

    /**
     * @dev Gets the total amount of tokens stored by the contract.
     * @return uint256 representing the total amount of tokens
     */
    function totalSupply() public view returns (uint256) {
        return _allTokens.length;
    }

    /**
     * @dev Gets the token ID at a given index of all the tokens in this contract
     * Reverts if the index is greater or equal to the total number of tokens.
     * @param index uint256 representing the index to be accessed of the tokens list
     * @return uint256 token ID at the given index of the tokens list
     */
    function tokenByIndex(uint256 index) public view returns (uint256) {
        require(index < totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }

    /**
     * @dev Internal function to transfer ownership of a given token ID to another address.
     * As opposed to transferFrom, this imposes no restrictions on msg.sender.
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
     */
    function _transferFrom(address from, address to, uint256 tokenId) internal {
        super._transferFrom(from, to, tokenId);

        _removeTokenFromOwnerEnumeration(from, tokenId);

        _addTokenToOwnerEnumeration(to, tokenId);
    }

    /**
     * @dev Internal function to mint a new token.
     * Reverts if the given token ID already exists.
     * @param to address the beneficiary that will own the minted token
     * @param tokenId uint256 ID of the token to be minted
     */
    function _mint(address to, uint256 tokenId) internal {
        super._mint(to, tokenId);

        _addTokenToOwnerEnumeration(to, tokenId);

        _addTokenToAllTokensEnumeration(tokenId);
    }

    /**
     * @dev Internal function to burn a specific token.
     * Reverts if the token does not exist.
     * Deprecated, use _burn(uint256) instead.
     * @param owner owner of the token to burn
     * @param tokenId uint256 ID of the token being burned
     */
    function _burn(address owner, uint256 tokenId) internal {
        super._burn(owner, tokenId);

        _removeTokenFromOwnerEnumeration(owner, tokenId);
        // Since tokenId will be deleted, we can clear its slot in _ownedTokensIndex to trigger a gas refund
        _ownedTokensIndex[tokenId] = 0;

        _removeTokenFromAllTokensEnumeration(tokenId);
    }

    /**
     * @dev Gets the list of token IDs of the requested owner.
     * @param owner address owning the tokens
     * @return uint256[] List of token IDs owned by the requested address
     */
    function _tokensOfOwner(address owner) internal view returns (uint256[] storage) {
        return _ownedTokens[owner];
    }

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        _ownedTokensIndex[tokenId] = _ownedTokens[to].length;
        _ownedTokens[to].push(tokenId);
    }

    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the _ownedTokensIndex mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _ownedTokens[from].length.sub(1);
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }

        // This also deletes the contents at the last position of the array
        _ownedTokens[from].length--;

        // Note that _ownedTokensIndex[tokenId] hasn't been cleared: it still points to the old slot (now occupied by
        // lastTokenId, or just over the end of the array if the token was the last one).
    }

    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _allTokens.length.sub(1);
        uint256 tokenIndex = _allTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

        // This also deletes the contents at the last position of the array
        _allTokens.length--;
        _allTokensIndex[tokenId] = 0;
    }
}


// File contracts/libs/CustomERC721Metadata.sol

// File: contracts/CustomERC721Metadata.sol

pragma solidity ^0.5.0;






/**
 * ERC721 base contract without the concept of tokenUri as this is managed by the parent
 */
contract CustomERC721Metadata is ERC165, ERC721, ERC721Enumerable {

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;

    /**
     * @dev Constructor function
     */
    constructor (string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;

        // register the supported interfaces to conform to ERC721 via ERC165
        _registerInterface(_INTERFACE_ID_ERC721_METADATA);
    }

    /**
     * @dev Gets the token name
     * @return string representing the token name
     */
    function name() external view returns (string memory) {
        return _name;
    }

    /**
     * @dev Gets the token symbol
     * @return string representing the token symbol
     */
    function symbol() external view returns (string memory) {
        return _symbol;
    }

}


// File contracts/libs/Strings.sol

// File: contracts/Strings.sol

pragma solidity ^0.5.0;

//https://github.com/oraclize/ethereum-api/blob/master/oraclizeAPI_0.5.sol
library Strings {

    function strConcat(string memory _a, string memory _b) internal pure returns (string memory _concatenatedString) {
        return strConcat(_a, _b, "", "", "");
    }

    function strConcat(string memory _a, string memory _b, string memory _c) internal pure returns (string memory _concatenatedString) {
        return strConcat(_a, _b, _c, "", "");
    }

    function strConcat(string memory _a, string memory _b, string memory _c, string memory _d) internal pure returns (string memory _concatenatedString) {
        return strConcat(_a, _b, _c, _d, "");
    }

    function strConcat(string memory _a, string memory _b, string memory _c, string memory _d, string memory _e) internal pure returns (string memory _concatenatedString) {
        bytes memory _ba = bytes(_a);
        bytes memory _bb = bytes(_b);
        bytes memory _bc = bytes(_c);
        bytes memory _bd = bytes(_d);
        bytes memory _be = bytes(_e);
        string memory abcde = new string(_ba.length + _bb.length + _bc.length + _bd.length + _be.length);
        bytes memory babcde = bytes(abcde);
        uint k = 0;
        uint i = 0;
        for (i = 0; i < _ba.length; i++) {
            babcde[k++] = _ba[i];
        }
        for (i = 0; i < _bb.length; i++) {
            babcde[k++] = _bb[i];
        }
        for (i = 0; i < _bc.length; i++) {
            babcde[k++] = _bc[i];
        }
        for (i = 0; i < _bd.length; i++) {
            babcde[k++] = _bd[i];
        }
        for (i = 0; i < _be.length; i++) {
            babcde[k++] = _be[i];
        }
        return string(babcde);
    }

    function uint2str(uint _i) internal pure returns (string memory _uintAsString) {
        if (_i == 0) {
            return "0";
        }
        uint j = _i;
        uint len;
        while (j != 0) {
            len++;
            j /= 10;
        }
        bytes memory bstr = new bytes(len);
        uint k = len - 1;
        while (_i != 0) {
            bstr[k--] = byte(uint8(48 + _i % 10));
            _i /= 10;
        }
        return string(bstr);
    }
}


// File contracts/GenArt721Core.sol

// File: contracts/GenArt721Core.sol

//0x1454EFCa69FA654e5A7d83CB61c1aD81790c44B7

//https://oneclickdapp.com/radar-valery/

pragma solidity ^0.5.0;




interface Randomizer {
   function returnValue() external view returns(bytes32);
}

contract GenArt721Core is CustomERC721Metadata {
    using SafeMath for uint256;

    event Mint(
        address indexed _to,
        uint256 indexed _tokenId,
        uint256 indexed _projectId

    );

    Randomizer public randomizerContract;

    struct Project {
        string name;
        string artist;
        string description;
        string website;
        string license;
        bool dynamic;
        string projectBaseURI;
        string projectBaseIpfsURI;
        uint256 invocations;
        uint256 maxInvocations;
        string scriptJSON;
        mapping(uint256 => string) scripts;
        uint scriptCount;
        string ipfsHash;
        bool useHashString;
        bool useIpfs;
        bool active;
        bool locked;
        bool paused;

    }

    uint256 constant ONE_MILLION = 1_000_000;
    mapping(uint256 => Project) projects;

    //All financial functions are stripped from struct for visibility
    mapping(uint256 => address) public projectIdToArtistAddress;
    mapping(uint256 => string) public projectIdToCurrencySymbol;
    mapping(uint256 => address) public projectIdToCurrencyAddress;
    mapping(uint256 => uint256) public projectIdToPricePerTokenInWei;
    mapping(uint256 => address) public projectIdToAdditionalPayee;
    mapping(uint256 => uint256) public projectIdToAdditionalPayeePercentage;
    mapping(uint256 => uint256) public projectIdToSecondaryMarketRoyaltyPercentage;

    address public artblocksAddress;
    uint256 public artblocksPercentage = 10;

    mapping(uint256 => string) public staticIpfsImageLink;
    mapping(uint256 => uint256) public tokenIdToProjectId;
    mapping(uint256 => uint256[]) internal projectIdToTokenIds;
    mapping(uint256 => bytes32) public tokenIdToHash;
    mapping(bytes32 => uint256) public hashToTokenId;

    address public admin;
    mapping(address => bool) public isWhitelisted;
    mapping(address => bool) public isMintWhitelisted;

    uint256 public nextProjectId = 3;

    modifier onlyValidTokenId(uint256 _tokenId) {
        require(_exists(_tokenId), "Token ID does not exist");
        _;
    }

    modifier onlyUnlocked(uint256 _projectId) {
        require(!projects[_projectId].locked, "Only if unlocked");
        _;
    }

    modifier onlyArtist(uint256 _projectId) {
        require(msg.sender == projectIdToArtistAddress[_projectId], "Only artist");
        _;
    }

    modifier onlyAdmin() {
        require(msg.sender == admin, "Only admin");
        _;
    }

    modifier onlyWhitelisted() {
        require(isWhitelisted[msg.sender], "Only whitelisted");
        _;
    }

    modifier onlyArtistOrWhitelisted(uint256 _projectId) {
        require(isWhitelisted[msg.sender] || msg.sender == projectIdToArtistAddress[_projectId], "Only artist or whitelisted");
        _;
    }

    constructor(string memory _tokenName, string memory _tokenSymbol, address _randomizerContract) CustomERC721Metadata(_tokenName, _tokenSymbol) public {
        admin = msg.sender;
        isWhitelisted[msg.sender] = true;
        artblocksAddress = msg.sender;
        randomizerContract = Randomizer(_randomizerContract);

    }

    function mint(address _to, uint256 _projectId, address _by) external returns (uint256 _tokenId) {
        require(isMintWhitelisted[msg.sender], "Must mint from whitelisted minter contract.");
        require(projects[_projectId].invocations.add(1) <= projects[_projectId].maxInvocations, "Must not exceed max invocations");
        require(projects[_projectId].active || _by == projectIdToArtistAddress[_projectId], "Project must exist and be active");
        require(!projects[_projectId].paused || _by == projectIdToArtistAddress[_projectId], "Purchases are paused.");


        uint256 tokenId = _mintToken(_to, _projectId);

        return tokenId;
    }

    function _mintToken(address _to, uint256 _projectId) internal returns (uint256 _tokenId) {

        uint256 tokenIdToBe = (_projectId * ONE_MILLION) + projects[_projectId].invocations;

        projects[_projectId].invocations = projects[_projectId].invocations.add(1);


            bytes32 hash = keccak256(abi.encodePacked(projects[_projectId].invocations, block.number, blockhash(block.number - 1), msg.sender, randomizerContract.returnValue()));
            tokenIdToHash[tokenIdToBe]=hash;
            hashToTokenId[hash] = tokenIdToBe;


        _mint(_to, tokenIdToBe);

        tokenIdToProjectId[tokenIdToBe] = _projectId;
        projectIdToTokenIds[_projectId].push(tokenIdToBe);

        emit Mint(_to, tokenIdToBe, _projectId);

        return tokenIdToBe;
    }
    function updateArtblocksAddress(address _artblocksAddress) public onlyAdmin {
        artblocksAddress = _artblocksAddress;
    }

    function updateArtblocksPercentage(uint256 _artblocksPercentage) public onlyAdmin {
        require(_artblocksPercentage <= 25, "Max of 25%");
        artblocksPercentage = _artblocksPercentage;
    }

    function addWhitelisted(address _address) public onlyAdmin {
        isWhitelisted[_address] = true;
    }

    function removeWhitelisted(address _address) public onlyAdmin {
        isWhitelisted[_address] = false;
    }

    function addMintWhitelisted(address _address) public onlyAdmin {
        isMintWhitelisted[_address] = true;
    }

    function removeMintWhitelisted(address _address) public onlyAdmin {
        isMintWhitelisted[_address] = false;
    }

    function updateRandomizerAddress(address _randomizerAddress) public onlyWhitelisted {
      randomizerContract = Randomizer(_randomizerAddress);
    }
    function toggleProjectIsLocked(uint256 _projectId) public onlyWhitelisted onlyUnlocked(_projectId) {
        projects[_projectId].locked = true;
    }

    function toggleProjectIsActive(uint256 _projectId) public onlyWhitelisted {
        projects[_projectId].active = !projects[_projectId].active;
    }

    function updateProjectArtistAddress(uint256 _projectId, address _artistAddress) public onlyArtistOrWhitelisted(_projectId) {
        projectIdToArtistAddress[_projectId] = _artistAddress;
    }

    function toggleProjectIsPaused(uint256 _projectId) public onlyArtist(_projectId) {
        projects[_projectId].paused = !projects[_projectId].paused;
    }

    function addProject(string memory _projectName, address _artistAddress, uint256 _pricePerTokenInWei, bool _dynamic) public onlyWhitelisted {

        uint256 projectId = nextProjectId;
        projectIdToArtistAddress[projectId] = _artistAddress;
        projects[projectId].name = _projectName;
        projectIdToCurrencySymbol[projectId] = "ETH";
        projectIdToPricePerTokenInWei[projectId] = _pricePerTokenInWei;
        projects[projectId].paused=true;
        projects[projectId].dynamic=_dynamic;
        projects[projectId].maxInvocations = ONE_MILLION;
        if (!_dynamic) {
            projects[projectId].useHashString = false;
        } else {
            projects[projectId].useHashString = true;
        }
        nextProjectId = nextProjectId.add(1);
    }

    function updateProjectCurrencyInfo(uint256 _projectId, string memory _currencySymbol, address _currencyAddress) onlyArtist(_projectId) public {
        projectIdToCurrencySymbol[_projectId] = _currencySymbol;
        projectIdToCurrencyAddress[_projectId] = _currencyAddress;
    }

    function updateProjectPricePerTokenInWei(uint256 _projectId, uint256 _pricePerTokenInWei) onlyArtist(_projectId) public {
        projectIdToPricePerTokenInWei[_projectId] = _pricePerTokenInWei;
    }

    function updateProjectName(uint256 _projectId, string memory _projectName) onlyUnlocked(_projectId) onlyArtistOrWhitelisted(_projectId) public {
        projects[_projectId].name = _projectName;
    }

    function updateProjectArtistName(uint256 _projectId, string memory _projectArtistName) onlyUnlocked(_projectId) onlyArtistOrWhitelisted(_projectId) public {
        projects[_projectId].artist = _projectArtistName;
    }

    function updateProjectAdditionalPayeeInfo(uint256 _projectId, address _additionalPayee, uint256 _additionalPayeePercentage) onlyArtist(_projectId) public {
        require(_additionalPayeePercentage <= 100, "Max of 100%");
        projectIdToAdditionalPayee[_projectId] = _additionalPayee;
        projectIdToAdditionalPayeePercentage[_projectId] = _additionalPayeePercentage;
    }

    function updateProjectSecondaryMarketRoyaltyPercentage(uint256 _projectId, uint256 _secondMarketRoyalty) onlyArtist(_projectId) public {
        require(_secondMarketRoyalty <= 100, "Max of 100%");
        projectIdToSecondaryMarketRoyaltyPercentage[_projectId] = _secondMarketRoyalty;
    }

    function updateProjectDescription(uint256 _projectId, string memory _projectDescription) onlyArtist(_projectId) public {
        projects[_projectId].description = _projectDescription;
    }

    function updateProjectWebsite(uint256 _projectId, string memory _projectWebsite) onlyArtist(_projectId) public {
        projects[_projectId].website = _projectWebsite;
    }

    function updateProjectLicense(uint256 _projectId, string memory _projectLicense) onlyUnlocked(_projectId) onlyArtistOrWhitelisted(_projectId) public {
        projects[_projectId].license = _projectLicense;
    }

    function updateProjectMaxInvocations(uint256 _projectId, uint256 _maxInvocations) onlyArtist(_projectId) public {
        require((!projects[_projectId].locked || _maxInvocations<projects[_projectId].maxInvocations), "Only if unlocked");
        require(_maxInvocations > projects[_projectId].invocations, "You must set max invocations greater than current invocations");
        require(_maxInvocations <= ONE_MILLION, "Cannot exceed 1,000,000");
        projects[_projectId].maxInvocations = _maxInvocations;
    }

    function toggleProjectUseHashString(uint256 _projectId) onlyUnlocked(_projectId) onlyArtistOrWhitelisted(_projectId) public {
      require(projects[_projectId].invocations == 0, "Cannot modify after a token is minted.");
      projects[_projectId].useHashString = !projects[_projectId].useHashString;
    }

    function addProjectScript(uint256 _projectId, string memory _script) onlyUnlocked(_projectId) onlyArtistOrWhitelisted(_projectId) public {
        projects[_projectId].scripts[projects[_projectId].scriptCount] = _script;
        projects[_projectId].scriptCount = projects[_projectId].scriptCount.add(1);
    }

    function updateProjectScript(uint256 _projectId, uint256 _scriptId, string memory _script) onlyUnlocked(_projectId) onlyArtistOrWhitelisted(_projectId) public {
        require(_scriptId < projects[_projectId].scriptCount, "scriptId out of range");
        projects[_projectId].scripts[_scriptId] = _script;
    }

    function removeProjectLastScript(uint256 _projectId) onlyUnlocked(_projectId) onlyArtistOrWhitelisted(_projectId) public {
        require(projects[_projectId].scriptCount > 0, "there are no scripts to remove");
        delete projects[_projectId].scripts[projects[_projectId].scriptCount - 1];
        projects[_projectId].scriptCount = projects[_projectId].scriptCount.sub(1);
    }

    function updateProjectScriptJSON(uint256 _projectId, string memory _projectScriptJSON) onlyUnlocked(_projectId) onlyArtistOrWhitelisted(_projectId) public {
        projects[_projectId].scriptJSON = _projectScriptJSON;
    }

    function updateProjectIpfsHash(uint256 _projectId, string memory _ipfsHash) onlyUnlocked(_projectId) onlyArtistOrWhitelisted(_projectId) public {
        projects[_projectId].ipfsHash = _ipfsHash;
    }

    function updateProjectBaseURI(uint256 _projectId, string memory _newBaseURI) onlyArtist(_projectId) public {
        projects[_projectId].projectBaseURI = _newBaseURI;
    }

    function updateProjectBaseIpfsURI(uint256 _projectId, string memory _projectBaseIpfsURI) onlyArtist(_projectId) public {
        projects[_projectId].projectBaseIpfsURI = _projectBaseIpfsURI;
    }

    function toggleProjectUseIpfsForStatic(uint256 _projectId) onlyArtist(_projectId) public {
        require(!projects[_projectId].dynamic, "can only set static IPFS hash for static projects");
        projects[_projectId].useIpfs = !projects[_projectId].useIpfs;
    }

    function toggleProjectIsDynamic(uint256 _projectId) onlyUnlocked(_projectId) onlyArtistOrWhitelisted(_projectId) public {
      require(projects[_projectId].invocations == 0, "Can not switch after a token is minted.");
        if (projects[_projectId].dynamic) {
            projects[_projectId].useHashString = false;
        } else {
            projects[_projectId].useHashString = true;
        }
        projects[_projectId].dynamic = !projects[_projectId].dynamic;
    }

    function overrideTokenDynamicImageWithIpfsLink(uint256 _tokenId, string memory _ipfsHash) onlyArtist(tokenIdToProjectId[_tokenId]) public {
        staticIpfsImageLink[_tokenId] = _ipfsHash;
    }

    function clearTokenIpfsImageUri(uint256 _tokenId) onlyArtist(tokenIdToProjectId[_tokenId]) public {
        delete staticIpfsImageLink[tokenIdToProjectId[_tokenId]];
    }

    function projectDetails(uint256 _projectId) view public returns (string memory projectName, string memory artist, string memory description, string memory website, string memory license, bool dynamic) {
        projectName = projects[_projectId].name;
        artist = projects[_projectId].artist;
        description = projects[_projectId].description;
        website = projects[_projectId].website;
        license = projects[_projectId].license;
        dynamic = projects[_projectId].dynamic;
    }

    function projectTokenInfo(uint256 _projectId) view public returns (address artistAddress, uint256 pricePerTokenInWei, uint256 invocations, uint256 maxInvocations, bool active, address additionalPayee, uint256 additionalPayeePercentage ,string memory currency, address currencyAddress) {
        artistAddress = projectIdToArtistAddress[_projectId];
        pricePerTokenInWei = projectIdToPricePerTokenInWei[_projectId];
        invocations = projects[_projectId].invocations;
        maxInvocations = projects[_projectId].maxInvocations;
        active = projects[_projectId].active;
        additionalPayee = projectIdToAdditionalPayee[_projectId];
        additionalPayeePercentage = projectIdToAdditionalPayeePercentage[_projectId];
        currency = projectIdToCurrencySymbol[_projectId];
        currencyAddress = projectIdToCurrencyAddress[_projectId];
    }

    function projectScriptInfo(uint256 _projectId) view public returns (string memory scriptJSON, uint256 scriptCount, bool useHashString, string memory ipfsHash, bool locked, bool paused) {
        scriptJSON = projects[_projectId].scriptJSON;
        scriptCount = projects[_projectId].scriptCount;
        useHashString = projects[_projectId].useHashString;
        ipfsHash = projects[_projectId].ipfsHash;
        locked = projects[_projectId].locked;
        paused = projects[_projectId].paused;
    }

    function projectScriptByIndex(uint256 _projectId, uint256 _index) view public returns (string memory){
        return projects[_projectId].scripts[_index];
    }

    function projectURIInfo(uint256 _projectId) view public returns (string memory projectBaseURI, string memory projectBaseIpfsURI, bool useIpfs) {
        projectBaseURI = projects[_projectId].projectBaseURI;
        projectBaseIpfsURI = projects[_projectId].projectBaseIpfsURI;
        useIpfs = projects[_projectId].useIpfs;
    }

    function projectShowAllTokens(uint _projectId) public view returns (uint256[] memory){
        return projectIdToTokenIds[_projectId];
    }

    function tokensOfOwner(address owner) external view returns (uint256[] memory) {
        return _tokensOfOwner(owner);
    }

    function getRoyaltyData(uint256 _tokenId) public view returns (address artistAddress, address additionalPayee, uint256 additionalPayeePercentage, uint256 royaltyFeeByID) {
        artistAddress = projectIdToArtistAddress[tokenIdToProjectId[_tokenId]];
        additionalPayee = projectIdToAdditionalPayee[tokenIdToProjectId[_tokenId]];
        additionalPayeePercentage = projectIdToAdditionalPayeePercentage[tokenIdToProjectId[_tokenId]];
        royaltyFeeByID = projectIdToSecondaryMarketRoyaltyPercentage[tokenIdToProjectId[_tokenId]];
    }

    function tokenURI(uint256 _tokenId) external view onlyValidTokenId(_tokenId) returns (string memory) {
        if (bytes(staticIpfsImageLink[_tokenId]).length > 0) {
            return Strings.strConcat(projects[tokenIdToProjectId[_tokenId]].projectBaseIpfsURI, staticIpfsImageLink[_tokenId]);
        }

        if (!projects[tokenIdToProjectId[_tokenId]].dynamic && projects[tokenIdToProjectId[_tokenId]].useIpfs) {
            return Strings.strConcat(projects[tokenIdToProjectId[_tokenId]].projectBaseIpfsURI, projects[tokenIdToProjectId[_tokenId]].ipfsHash);
        }

        return Strings.strConcat(projects[tokenIdToProjectId[_tokenId]].projectBaseURI, Strings.uint2str(_tokenId));
    }
}