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// 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 {
    // 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;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 100
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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,"name":"_projectId","type":"uint256"},{"internalType":"uint256","name":"_auctionTimestampStart","type":"uint256"},{"internalType":"uint256","name":"_priceDecayHalfLifeSeconds","type":"uint256"},{"internalType":"uint256","name":"_startPrice","type":"uint256"},{"internalType":"uint256","name":"_basePrice","type":"uint256"}],"name":"setAuctionDetails","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_projectId","type":"uint256"}],"name":"setProjectMaxInvocations","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_projectId","type":"uint256"}],"name":"togglePurchaseToDisabled","outputs":[],"stateMutability":"view","type":"function"}]

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00000000000000000000000064780ce53f6e966e18a22af13a2f97369580ec11000000000000000000000000267313e435863f15285cf0f8572068aaa62fc40d

-----Decoded View---------------
Arg [0] : _genArt721Address (address): 0x64780CE53f6e966E18a22Af13a2F97369580Ec11
Arg [1] : _minterFilter (address): 0x267313E435863f15285CF0f8572068aAA62fC40d

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 00000000000000000000000064780ce53f6e966e18a22af13a2f97369580ec11
Arg [1] : 000000000000000000000000267313e435863f15285cf0f8572068aaa62fc40d