Contract Source Code (Solidity Standard Json-Input format)

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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "../../blitmaps/contracts/Blitmap.sol";

contract Flipmap is ERC721, ReentrancyGuard {

    uint256 public _tokenId = 1700;

    struct SVGCursor {
        uint8 x;
        uint8 y;
        string color1;
        string color2;
        string color3;
        string color4;
    }

    struct Colors {
        uint[4] r;
        uint[4] g;
        uint[4] b;
    }

    struct VariantParents {
        uint256 tokenIdA;
        uint256 tokenIdB;
    }

    mapping(uint256 => VariantParents) private _tokenParentIndex;
    mapping(bytes32 => bool) private _tokenPairs;
    mapping(address => uint256) private _creators;

    address sara    = 0x00796e910Bd0228ddF4cd79e3f353871a61C351C;
    address lambo   = 0xafBDEc0ba91FDFf03A91CbdF07392e6D72d43712;
    address dev     = 0xE424E566BFc3f7aDDFfb17862637DD61e2da3bE2;

    Blitmap blitmap;

    address private _owner;
    modifier onlyOwner() {
        require(msg.sender == _owner);
        _;
    }

    constructor(address _blitAddress) ERC721("Flipmap", "FLIP") {
        _owner = msg.sender;
        blitmap = Blitmap(_blitAddress);
    }

    function transferOwner(address _newOwner) public onlyOwner {
        _owner = _newOwner;
    }

    function totalSupply() public view returns (uint256) {
        return _tokenId - 1700;
    }

    function savePairs(uint256[][] memory pairHashes) public onlyOwner {
        for(uint256 i=0; i<pairHashes.length; i++) {
            bytes32 pairHash = keccak256(abi.encodePacked(pairHashes[i][0], '-', pairHashes[i][1]));
            _tokenPairs[pairHash] = true;
        }
    }

    function mintVariant(uint256 tokenIdA, uint256 tokenIdB) public nonReentrant payable {
        require(msg.value == 0.03 ether);
        require(tokenIdA != tokenIdB, "b:08");
        require(blitmap.tokenIsOriginal(tokenIdA) && blitmap.tokenIsOriginal(tokenIdB), "b:10");

        // a given pair can only be minted once
        bytes32 pairHash = keccak256(abi.encodePacked(tokenIdA, '-', tokenIdB));
        require(_tokenPairs[pairHash] == false, "b:11");

        uint256 variantTokenId = _tokenId;
        _tokenId++;

        VariantParents memory parents;
        parents.tokenIdA = tokenIdA;
        parents.tokenIdB = tokenIdB;

        address creatorA = blitmap.tokenCreatorOf(tokenIdA);
        address creatorB = blitmap.tokenCreatorOf(tokenIdB);

        _tokenParentIndex[variantTokenId] = parents;
        _tokenPairs[pairHash] = true;
        _safeMint(msg.sender, variantTokenId);

        _creators[creatorA]     += .0065625 ether;
        _creators[creatorB]     += .0009375 ether;
        _creators[sara]         += .0075 ether;
        _creators[lambo]        += .0075 ether;
        _creators[dev]          += .0075 ether;
    }

    function availableBalanceForCreator(address creatorAddress) public view returns (uint256) {
        return _creators[creatorAddress];
    }

    function withdrawAvailableBalance() public nonReentrant {
        uint256 withdrawAmount = _creators[msg.sender];
        _creators[msg.sender] = 0;
        payable(msg.sender).transfer(withdrawAmount);
    }

    function getByOwner(address owner) view public returns(uint256[] memory result) {
        result = new uint256[](balanceOf(owner));
        uint256 resultIndex = 0;
        for (uint256 t = 0; t < _tokenId; t++) {
            if (_exists(t) && ownerOf(t) == owner) {
                result[resultIndex] = t;
                resultIndex++;
            }
        }
    }

    function pairIsTaken(uint256 tokenIdA, uint256 tokenIdB) public view returns (bool) {
        bytes32 pairHash = keccak256(abi.encodePacked(tokenIdA, '-', tokenIdB));
        return _tokenPairs[pairHash];
    }

    function currentTokenId() public view returns (uint256) {
        return _tokenId;
    }

    function tokenIsOriginal(uint256 tokenId) public view returns (bool) {
        if(tokenId < 1700) {
            return blitmap.tokenIsOriginal(tokenId);
        }
        return false;
    }

    function tokenDataOf(uint256 tokenId) public view returns (bytes memory) {
        if (tokenId < 1700) {
            return blitmap.tokenDataOf(tokenId);
        }

        bytes memory tokenParentData;
        if(_exists(tokenId)) {
            tokenParentData = blitmap.tokenDataOf(_tokenParentIndex[tokenId].tokenIdA);
            bytes memory tokenPaletteData = blitmap.tokenDataOf(_tokenParentIndex[tokenId].tokenIdB);
            for (uint8 i = 0; i < 12; ++i) {
                // overwrite palette data with parent B's palette data
                tokenParentData[i] = tokenPaletteData[i];
            }
        }

        return tokenParentData;
    }

    function tokenParentsOf(uint256 tokenId) public view returns (uint256, uint256) {
        require(!tokenIsOriginal(tokenId));
        return (_tokenParentIndex[tokenId].tokenIdA, _tokenParentIndex[tokenId].tokenIdB);
    }

    function uintToHexDigit(uint8 d) internal pure returns (bytes1) {
        if (0 <= d && d <= 9) {
            return bytes1(uint8(bytes1('0')) + d);
        } else if (10 <= uint8(d) && uint8(d) <= 15) {
            return bytes1(uint8(bytes1('a')) + d - 10);
        }
        revert();
    }

    function uintToHexString(uint a) internal pure returns (string memory) {
        uint count = 0;
        uint b = a;
        while (b != 0) {
            count++;
            b /= 16;
        }
        bytes memory res = new bytes(count);
        for (uint i=0; i<count; ++i) {
            b = a % 16;
            res[count - i - 1] = uintToHexDigit(uint8(b));
            a /= 16;
        }

        string memory str = string(res);
        if (bytes(str).length == 0) {
            return "00";
        } else if (bytes(str).length == 1) {
            return string(abi.encodePacked("0", str));
        }
        return str;
    }

    function byteToUint(bytes1 b) internal pure returns (uint) {
        return uint(uint8(b));
    }

    function byteToHexString(bytes1 b) internal pure returns (string memory) {
        return uintToHexString(byteToUint(b));
    }

    function bitTest(bytes1 aByte, uint8 index) internal pure returns (bool) {
        return uint8(aByte) >> index & 1 == 1;
    }

    function colorIndex(bytes1 aByte, uint8 index1, uint8 index2) internal pure returns (uint) {
        if (bitTest(aByte, index2) && bitTest(aByte, index1)) {
            return 3;
        } else if (bitTest(aByte, index2) && !bitTest(aByte, index1)) {
            return 2;
        } else if (!bitTest(aByte, index2) && bitTest(aByte, index1)) {
            return 1;
        }
        return 0;
    }

    function pixel4(string[32] memory lookup, SVGCursor memory pos) internal pure returns (string memory) {
        return string(abi.encodePacked(
            '<rect fill="', pos.color1, '" x="', lookup[pos.x], '" y="', lookup[pos.y], '" width="1.5" height="1.5" />',
            '<rect fill="', pos.color2, '" x="', lookup[pos.x + 1], '" y="', lookup[pos.y], '" width="1.5" height="1.5" />',

            string(abi.encodePacked(
                '<rect fill="', pos.color3, '" x="', lookup[pos.x + 2], '" y="', lookup[pos.y], '" width="1.5" height="1.5" />',
                '<rect fill="', pos.color4, '" x="', lookup[pos.x + 3], '" y="', lookup[pos.y], '" width="1.5" height="1.5" />'
            ))
        ));
    }

    function parentSvgDataOf(uint256 tokenIdA, uint256 tokenIdB) public view returns (string memory) {
        bytes memory tokenParentData = blitmap.tokenDataOf(tokenIdA);
        bytes memory tokenPaletteData = blitmap.tokenDataOf(tokenIdB);
        for (uint8 i = 0; i < 12; ++i) {
            // overwrite palette data with parent B's palette data
            tokenParentData[i] = tokenPaletteData[i];
        }
        return tokenSvgData(tokenParentData);
    }

    function tokenSvgDataOf(uint256 tokenId) public view returns (string memory) {
        bytes memory data = tokenDataOf(tokenId);
        return tokenSvgData(data);
    }

    function tokenSvgData(bytes memory data) public pure returns (string memory) {
        string memory svgString = '<?xml version="1.0" encoding="UTF-8" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" version="1.1" viewBox="0 0 1000 1000"><svg xmlns="http://www.w3.org/2000/svg" version="1.1" viewBox="0 0 32 32" shape-rendering="crispEdges"><g transform="translate(32, 0) scale(-1,1)">';

        string[32] memory lookup = [
        "0", "1", "2", "3", "4", "5", "6", "7",
        "8", "9", "10", "11", "12", "13", "14", "15",
        "16", "17", "18", "19", "20", "21", "22", "23",
        "24", "25", "26", "27", "28", "29", "30", "31"
        ];

        SVGCursor memory pos;

        string[4] memory colors = [
        string(abi.encodePacked("#", byteToHexString(data[0]), byteToHexString(data[1]), byteToHexString(data[2]))),
        string(abi.encodePacked("#", byteToHexString(data[3]), byteToHexString(data[4]), byteToHexString(data[5]))),
        string(abi.encodePacked("#", byteToHexString(data[6]), byteToHexString(data[7]), byteToHexString(data[8]))),
        string(abi.encodePacked("#", byteToHexString(data[9]), byteToHexString(data[10]), byteToHexString(data[11])))
        ];

        string[8] memory p;

        for (uint i = 12; i < 268; i += 8) {
            pos.color1 =  colors[colorIndex(data[i], 6, 7)];
            pos.color2 =  colors[colorIndex(data[i], 4, 5)];
            pos.color3 =  colors[colorIndex(data[i], 2, 3)];
            pos.color4 =  colors[colorIndex(data[i], 0, 1)];
            p[0] = pixel4(lookup, pos);
            pos.x += 4;

            pos.color1 =  colors[colorIndex(data[i + 1], 6, 7)];
            pos.color2 =  colors[colorIndex(data[i + 1], 4, 5)];
            pos.color3 =  colors[colorIndex(data[i + 1], 2, 3)];
            pos.color4 =  colors[colorIndex(data[i + 1], 0, 1)];
            p[1] = pixel4(lookup, pos);
            pos.x += 4;

            pos.color1 =  colors[colorIndex(data[i + 2], 6, 7)];
            pos.color2 =  colors[colorIndex(data[i + 2], 4, 5)];
            pos.color3 =  colors[colorIndex(data[i + 2], 2, 3)];
            pos.color4 =  colors[colorIndex(data[i + 2], 0, 1)];
            p[2] = pixel4(lookup, pos);
            pos.x += 4;

            pos.color1 =  colors[colorIndex(data[i + 3], 6, 7)];
            pos.color2 =  colors[colorIndex(data[i + 3], 4, 5)];
            pos.color3 =  colors[colorIndex(data[i + 3], 2, 3)];
            pos.color4 =  colors[colorIndex(data[i + 3], 0, 1)];
            p[3] = pixel4(lookup, pos);
            pos.x += 4;

            pos.color1 =  colors[colorIndex(data[i + 4], 6, 7)];
            pos.color2 =  colors[colorIndex(data[i + 4], 4, 5)];
            pos.color3 =  colors[colorIndex(data[i + 4], 2, 3)];
            pos.color4 =  colors[colorIndex(data[i + 4], 0, 1)];
            p[4] = pixel4(lookup, pos);
            pos.x += 4;

            pos.color1 =  colors[colorIndex(data[i + 5], 6, 7)];
            pos.color2 =  colors[colorIndex(data[i + 5], 4, 5)];
            pos.color3 =  colors[colorIndex(data[i + 5], 2, 3)];
            pos.color4 =  colors[colorIndex(data[i + 5], 0, 1)];
            p[5] = pixel4(lookup, pos);
            pos.x += 4;

            pos.color1 =  colors[colorIndex(data[i + 6], 6, 7)];
            pos.color2 =  colors[colorIndex(data[i + 6], 4, 5)];
            pos.color3 =  colors[colorIndex(data[i + 6], 2, 3)];
            pos.color4 =  colors[colorIndex(data[i + 6], 0, 1)];
            p[6] = pixel4(lookup, pos);
            pos.x += 4;

            pos.color1 =  colors[colorIndex(data[i + 7], 6, 7)];
            pos.color2 =  colors[colorIndex(data[i + 7], 4, 5)];
            pos.color3 =  colors[colorIndex(data[i + 7], 2, 3)];
            pos.color4 =  colors[colorIndex(data[i + 7], 0, 1)];
            p[7] = pixel4(lookup, pos);
            pos.x += 4;

            svgString = string(abi.encodePacked(svgString, p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]));

            if (pos.x >= 32) {
                pos.x = 0;
                pos.y += 1;
            }
        }

        svgString = string(abi.encodePacked(svgString, "</g></svg></svg>"));
        return svgString;
    }

    function tokenRGBColorsOf(uint256 tokenId) public view returns (BlitmapAnalysis.Colors memory) {
        return BlitmapAnalysis.tokenRGBColorsOf(tokenDataOf(tokenId));
    }

    function tokenSlabsOf(uint256 tokenId) public view returns (string[4] memory) {
        bytes memory data = tokenDataOf(tokenId);
        BlitmapAnalysis.Colors memory rgb = BlitmapAnalysis.tokenRGBColorsOf(data);

        string[4] memory chars = [unicode"◢", unicode"◣", unicode"◤", unicode"◥"];
        string[4] memory slabs;

        slabs[0] = chars[(rgb.r[0] + rgb.g[0] + rgb.b[0]) % 4];
        slabs[1] = chars[(rgb.r[1] + rgb.g[1] + rgb.b[1]) % 4];
        slabs[2] = chars[(rgb.r[2] + rgb.g[2] + rgb.b[2]) % 4];
        slabs[3] = chars[(rgb.r[3] + rgb.g[3] + rgb.b[3]) % 4];

        return slabs;
    }

    function tokenAffinityOf(uint256 tokenId) public view returns (string[3] memory) {
        return BlitmapAnalysis.tokenAffinityOf(tokenDataOf(tokenId));
    }

    function makeAttributes(uint256 tokenId) public view returns (string memory attributes) {
        string[5] memory traits;

        uint256 parentA = _tokenParentIndex[tokenId].tokenIdA;
        uint256 parentB = _tokenParentIndex[tokenId].tokenIdB;

        traits[0] = '{"trait_type":"Type","value":"Flipling"}';
        traits[1] = string(abi.encodePacked('{"trait_type":"Composition","value":"', blitmap.tokenNameOf(parentA), ' (#', toString(parentA), ')"}'));
        traits[2] = string(abi.encodePacked('{"trait_type":"Palette","value":"', blitmap.tokenNameOf(parentB), ' (#', toString(parentB), ')"}'));

        string[3] memory affinity = tokenAffinityOf(tokenId);
        traits[3] = string(abi.encodePacked('{"trait_type":"Affinity","value":"', affinity[0]));
        if(bytes(affinity[1]).length > 0) {
            traits[3] = string(abi.encodePacked(traits[3], ', ', affinity[1]));
        }
        if(bytes(affinity[2]).length > 0) {
            traits[3] = string(abi.encodePacked(traits[3], ', ', affinity[2]));
        }
        traits[3] = string(abi.encodePacked(traits[3], '"}'));

        string[4] memory slabs = tokenSlabsOf(tokenId);
        traits[4] = string(abi.encodePacked('{"trait_type":"Slabs","value":"', slabs[0], ' ', slabs[1], ' ', slabs[2], ' ', slabs[3], '"}'));

        attributes = string(abi.encodePacked(traits[0], ',', traits[1], ',', traits[2], ',', traits[3], ',', traits[4]));
    }

    function tokenURI(uint256 tokenId) override public view returns (string memory) {
        uint256 parentA = _tokenParentIndex[tokenId].tokenIdA;
        uint256 parentB = _tokenParentIndex[tokenId].tokenIdB;

        string memory name = string(abi.encodePacked('#', toString(tokenId), ' - ', blitmap.tokenNameOf(parentA), ' ', blitmap.tokenNameOf(parentB)));
        string memory description = 'Flipmaps are the lost 8,300 Blitmaps, only flipped.';
        string memory image = string(abi.encodePacked('data:image/svg+xml;base64,', Base64.encode(bytes(tokenSvgDataOf(tokenId)))));
        string memory json = string(abi.encodePacked('{"name": "', name, '", "description": "', description, '", "image": "', image, '", "attributes": [', makeAttributes(tokenId), ']}'));
        return string(abi.encodePacked('data:application/json;base64,', Base64.encode(bytes(json))));
    }

    function toString(uint256 value) public pure returns (string memory) {
        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }
}


library Base64 {
    bytes internal constant TABLE = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

    /// @notice Encodes some bytes to the base64 representation
    function encode(bytes memory data) internal pure returns (string memory) {
        uint256 len = data.length;
        if (len == 0) return "";

        // multiply by 4/3 rounded up
        uint256 encodedLen = 4 * ((len + 2) / 3);

        // Add some extra buffer at the end
        bytes memory result = new bytes(encodedLen + 32);

        bytes memory table = TABLE;

        assembly {
            let tablePtr := add(table, 1)
            let resultPtr := add(result, 32)

            for {
                let i := 0
            } lt(i, len) {

            } {
                i := add(i, 3)
                let input := and(mload(add(data, i)), 0xffffff)

                let out := mload(add(tablePtr, and(shr(18, input), 0x3F)))
                out := shl(8, out)
                out := add(out, and(mload(add(tablePtr, and(shr(12, input), 0x3F))), 0xFF))
                out := shl(8, out)
                out := add(out, and(mload(add(tablePtr, and(shr(6, input), 0x3F))), 0xFF))
                out := shl(8, out)
                out := add(out, and(mload(add(tablePtr, and(input, 0x3F))), 0xFF))
                out := shl(224, out)

                mstore(resultPtr, out)

                resultPtr := add(resultPtr, 4)
            }

            switch mod(len, 3)
            case 1 {
                mstore(sub(resultPtr, 2), shl(240, 0x3d3d))
            }
            case 2 {
                mstore(sub(resultPtr, 1), shl(248, 0x3d))
            }

            mstore(result, encodedLen)
        }

        return string(result);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

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

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

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

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

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

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "./IERC721Enumerable.sol";

/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => 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;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _allTokens.length;
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);

        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }

    /**
     * @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 {
        uint256 length = ERC721.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }

    /**
     * @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 = ERC721.balanceOf(from) - 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
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }

    /**
     * @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 - 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
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

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

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overriden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

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

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _balances[to] += 1;
        _owners[tokenId] = to;

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

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        _balances[owner] -= 1;
        delete _owners[tokenId];

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

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}

// SPDX-License-Identifier: MIT

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 make 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: Apache-2.0

/*
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   APPENDIX: How to apply the Apache License to your work.

      To apply the Apache License to your work, attach the following
      boilerplate notice, with the fields enclosed by brackets "[]"
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   Copyright 2018 James Lockhart <[email protected]>

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

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   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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*/

pragma solidity ^0.8.0;

/**
 * Strings Library
 *
 * In summary this is a simple library of string functions which make simple
 * string operations less tedious in solidity.
 *
 * Please be aware these functions can be quite gas heavy so use them only when
 * necessary not to clog the blockchain with expensive transactions.
 *
 * @author James Lockhart <[email protected]>
 */
library StringUtil {

    function titleCase(string memory _base)
    internal
    pure
    returns (string[] memory) {
        string[] memory components = split(_base, " ");
        for (uint8 i = 0; i < components.length; ++i) {
            if (length(components[i]) == 0) {
                continue;
            }
            string memory firstChar = substring(components[i], 1);
            string memory remainingChars = _substring(components[i], int(StringUtil.length(components[i]) - 1), 1);
            components[i] = string(abi.encodePacked(upper(firstChar), remainingChars));
        }

        return components;
    }

    /**
     * Concat (High gas cost)
     *
     * Appends two strings together and returns a new value
     *
     * @param _base When being used for a data type this is the extended object
     *              otherwise this is the string which will be the concatenated
     *              prefix
     * @param _value The value to be the concatenated suffix
     * @return string The resulting string from combinging the base and value
     */
    function concat(string memory _base, string memory _value)
    internal
    pure
    returns (string memory) {
        bytes memory _baseBytes = bytes(_base);
        bytes memory _valueBytes = bytes(_value);

        assert(_valueBytes.length > 0);

        string memory _tmpValue = new string(_baseBytes.length +
            _valueBytes.length);
        bytes memory _newValue = bytes(_tmpValue);

        uint i;
        uint j;

        for (i = 0; i < _baseBytes.length; i++) {
            _newValue[j++] = _baseBytes[i];
        }

        for (i = 0; i < _valueBytes.length; i++) {
            _newValue[j++] = _valueBytes[i];
        }

        return string(_newValue);
    }

    /**
     * Index Of
     *
     * Locates and returns the position of a character within a string
     *
     * @param _base When being used for a data type this is the extended object
     *              otherwise this is the string acting as the haystack to be
     *              searched
     * @param _value The needle to search for, at present this is currently
     *               limited to one character
     * @return int The position of the needle starting from 0 and returning -1
     *             in the case of no matches found
     */
    function indexOf(string memory _base, string memory _value)
    internal
    pure
    returns (int) {
        return _indexOf(_base, _value, 0);
    }

    /**
     * Index Of
     *
     * Locates and returns the position of a character within a string starting
     * from a defined offset
     *
     * @param _base When being used for a data type this is the extended object
     *              otherwise this is the string acting as the haystack to be
     *              searched
     * @param _value The needle to search for, at present this is currently
     *               limited to one character
     * @param _offset The starting point to start searching from which can start
     *                from 0, but must not exceed the length of the string
     * @return int The position of the needle starting from 0 and returning -1
     *             in the case of no matches found
     */
    function _indexOf(string memory _base, string memory _value, uint _offset)
    internal
    pure
    returns (int) {
        bytes memory _baseBytes = bytes(_base);
        bytes memory _valueBytes = bytes(_value);

        assert(_valueBytes.length == 1);

        for (uint i = _offset; i < _baseBytes.length; i++) {
            if (_baseBytes[i] == _valueBytes[0]) {
                return int(i);
            }
        }

        return -1;
    }

    /**
     * Length
     *
     * Returns the length of the specified string
     *
     * @param _base When being used for a data type this is the extended object
     *              otherwise this is the string to be measured
     * @return uint The length of the passed string
     */
    function length(string memory _base)
    internal
    pure
    returns (uint) {
        bytes memory _baseBytes = bytes(_base);
        return _baseBytes.length;
    }

    /**
     * Sub String
     *
     * Extracts the beginning part of a string based on the desired length
     *
     * @param _base When being used for a data type this is the extended object
     *              otherwise this is the string that will be used for
     *              extracting the sub string from
     * @param _length The length of the sub string to be extracted from the base
     * @return string The extracted sub string
     */
    function substring(string memory _base, int _length)
    internal
    pure
    returns (string memory) {
        return _substring(_base, _length, 0);
    }

    /**
     * Sub String
     *
     * Extracts the part of a string based on the desired length and offset. The
     * offset and length must not exceed the lenth of the base string.
     *
     * @param _base When being used for a data type this is the extended object
     *              otherwise this is the string that will be used for
     *              extracting the sub string from
     * @param _length The length of the sub string to be extracted from the base
     * @param _offset The starting point to extract the sub string from
     * @return string The extracted sub string
     */
    function _substring(string memory _base, int _length, int _offset)
    internal
    pure
    returns (string memory) {
        bytes memory _baseBytes = bytes(_base);

        assert(uint(_offset + _length) <= _baseBytes.length);

        string memory _tmp = new string(uint(_length));
        bytes memory _tmpBytes = bytes(_tmp);

        uint j = 0;
        for (uint i = uint(_offset); i < uint(_offset + _length); i++) {
            _tmpBytes[j++] = _baseBytes[i];
        }

        return string(_tmpBytes);
    }

    /**
     * String Split (Very high gas cost)
     *
     * Splits a string into an array of strings based off the delimiter value.
     * Please note this can be quite a gas expensive function due to the use of
     * storage so only use if really required.
     *
     * @param _base When being used for a data type this is the extended object
     *               otherwise this is the string value to be split.
     * @param _value The delimiter to split the string on which must be a single
     *               character
     * @return splitArr An array of values split based off the delimiter, but
     *                  do not container the delimiter.
     */
    function split(string memory _base, string memory _value)
    internal
    pure
    returns (string[] memory splitArr) {
        bytes memory _baseBytes = bytes(_base);

        uint _offset = 0;
        uint _splitsCount = 1;
        while (_offset < _baseBytes.length - 1) {
            int _limit = _indexOf(_base, _value, _offset);
            if (_limit == -1)
                break;
            else {
                _splitsCount++;
                _offset = uint(_limit) + 1;
            }
        }

        splitArr = new string[](_splitsCount);

        _offset = 0;
        _splitsCount = 0;
        while (_offset < _baseBytes.length - 1) {

            int _limit = _indexOf(_base, _value, _offset);
            if (_limit == - 1) {
                _limit = int(_baseBytes.length);
            }

            string memory _tmp = new string(uint(_limit) - _offset);
            bytes memory _tmpBytes = bytes(_tmp);

            uint j = 0;
            for (uint i = _offset; i < uint(_limit); i++) {
                _tmpBytes[j++] = _baseBytes[i];
            }
            _offset = uint(_limit) + 1;
            splitArr[_splitsCount++] = string(_tmpBytes);
        }
        return splitArr;
    }

    /**
     * Compare To
     *
     * Compares the characters of two strings, to ensure that they have an
     * identical footprint
     *
     * @param _base When being used for a data type this is the extended object
     *               otherwise this is the string base to compare against
     * @param _value The string the base is being compared to
     * @return bool Simply notates if the two string have an equivalent
     */
    function compareTo(string memory _base, string memory _value)
    internal
    pure
    returns (bool) {
        bytes memory _baseBytes = bytes(_base);
        bytes memory _valueBytes = bytes(_value);

        if (_baseBytes.length != _valueBytes.length) {
            return false;
        }

        for (uint i = 0; i < _baseBytes.length; i++) {
            if (_baseBytes[i] != _valueBytes[i]) {
                return false;
            }
        }

        return true;
    }

    /**
     * Compare To Ignore Case (High gas cost)
     *
     * Compares the characters of two strings, converting them to the same case
     * where applicable to alphabetic characters to distinguish if the values
     * match.
     *
     * @param _base When being used for a data type this is the extended object
     *               otherwise this is the string base to compare against
     * @param _value The string the base is being compared to
     * @return bool Simply notates if the two string have an equivalent value
     *              discarding case
     */
    function compareToIgnoreCase(string memory _base, string memory _value)
    internal
    pure
    returns (bool) {
        bytes memory _baseBytes = bytes(_base);
        bytes memory _valueBytes = bytes(_value);

        if (_baseBytes.length != _valueBytes.length) {
            return false;
        }

        for (uint i = 0; i < _baseBytes.length; i++) {
            if (_baseBytes[i] != _valueBytes[i] &&
            _upper(_baseBytes[i]) != _upper(_valueBytes[i])) {
                return false;
            }
        }

        return true;
    }

    /**
     * Upper
     *
     * Converts all the values of a string to their corresponding upper case
     * value.
     *
     * @param _base When being used for a data type this is the extended object
     *              otherwise this is the string base to convert to upper case
     * @return string
     */
    function upper(string memory _base)
    internal
    pure
    returns (string memory) {
        bytes memory _baseBytes = bytes(_base);
        for (uint i = 0; i < _baseBytes.length; i++) {
            _baseBytes[i] = _upper(_baseBytes[i]);
        }
        return string(_baseBytes);
    }

    /**
     * Lower
     *
     * Converts all the values of a string to their corresponding lower case
     * value.
     *
     * @param _base When being used for a data type this is the extended object
     *              otherwise this is the string base to convert to lower case
     * @return string
     */
    function lower(string memory _base)
    internal
    pure
    returns (string memory) {
        bytes memory _baseBytes = bytes(_base);
        for (uint i = 0; i < _baseBytes.length; i++) {
            _baseBytes[i] = _lower(_baseBytes[i]);
        }
        return string(_baseBytes);
    }

    /**
     * Upper
     *
     * Convert an alphabetic character to upper case and return the original
     * value when not alphabetic
     *
     * @param _b1 The byte to be converted to upper case
     * @return bytes1 The converted value if the passed value was alphabetic
     *                and in a lower case otherwise returns the original value
     */
    function _upper(bytes1 _b1)
    private
    pure
    returns (bytes1) {

        if (_b1 >= 0x61 && _b1 <= 0x7A) {
            return bytes1(uint8(_b1) - 32);
        }

        return _b1;
    }

    /**
     * Lower
     *
     * Convert an alphabetic character to lower case and return the original
     * value when not alphabetic
     *
     * @param _b1 The byte to be converted to lower case
     * @return bytes1 The converted value if the passed value was alphabetic
     *                and in a upper case otherwise returns the original value
     */
    function _lower(bytes1 _b1)
    private
    pure
    returns (bytes1) {

        if (_b1 >= 0x41 && _b1 <= 0x5A) {
            return bytes1(uint8(_b1) + 32);
        }

        return _b1;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

library BlitmapAnalysis {
    struct Colors {
        uint[4] r;
        uint[4] g;
        uint[4] b;
    }

    function byteToUint(bytes1 b) internal pure returns (uint) {
        return uint(uint8(b));
    }

    function tokenRGBColorsOf(bytes memory data) public pure returns (Colors memory) {
        Colors memory rgb;

        rgb.r[0] = byteToUint(data[0]);
        rgb.g[0] = byteToUint(data[1]);
        rgb.b[0] = byteToUint(data[2]);

        rgb.r[1] = byteToUint(data[3]);
        rgb.g[1] = byteToUint(data[4]);
        rgb.b[1] = byteToUint(data[5]);

        rgb.r[2] = byteToUint(data[6]);
        rgb.g[2] = byteToUint(data[7]);
        rgb.b[2] = byteToUint(data[8]);

        rgb.r[3] = byteToUint(data[9]);
        rgb.g[3] = byteToUint(data[10]);
        rgb.b[3] = byteToUint(data[11]);

        return rgb;
    }

    function tokenSlabsOf(bytes memory data) public pure returns (string[4] memory) {
        Colors memory rgb = tokenRGBColorsOf(data);

        string[4] memory chars = ["◢", "◣", "◤", "◥"];
        string[4] memory slabs;

        slabs[0] = chars[(rgb.r[0] + rgb.g[0] + rgb.b[0]) % 4];
        slabs[1] = chars[(rgb.r[1] + rgb.g[1] + rgb.b[1]) % 4];
        slabs[2] = chars[(rgb.r[2] + rgb.g[2] + rgb.b[2]) % 4];
        slabs[3] = chars[(rgb.r[3] + rgb.g[3] + rgb.b[3]) % 4];

        return slabs;
    }

    function tokenAffinityOf(bytes memory data) public pure returns (string[3] memory) {
        Colors memory rgb = tokenRGBColorsOf(data);

        uint r = rgb.r[0] + rgb.r[1] + rgb.r[2];
        uint g = rgb.g[0] + rgb.g[1] + rgb.g[2];
        uint b = rgb.b[0] + rgb.b[1] + rgb.b[2];

        string[3] memory essences;
        uint8 offset;

        if (r >= g && r >= b) {
            essences[offset] = "Fire";
            ++offset;

            if (g > 256) {
                essences[offset] = "Earth";
                ++offset;
            }

            if (b > 256) {
                essences[offset] = "Water";
                ++offset;
            }
        } else if (g >= r && g >= b) {
            essences[offset] = "Earth";
            ++offset;

            if (r > 256) {
                essences[offset] = "Fire";
                ++offset;
            }

            if (b > 256) {
                essences[offset] = "Water";
                ++offset;
            }
        } else if (b >= r && b >= g) {
            essences[offset] = "Water";
            ++offset;

            if (r > 256) {
                essences[offset] = "Fire";
                ++offset;
            }

            if (g > 256) {
                essences[offset] = "Earth";
                ++offset;
            }
        }

        if (offset == 1) {
            essences[0] = string(abi.encodePacked(essences[0], " III"));
        } else if (offset == 2) {
            essences[0] = string(abi.encodePacked(essences[0], " II"));
            essences[1] = string(abi.encodePacked(essences[1], " I"));
        } else if (offset == 3) {
            essences[0] = string(abi.encodePacked(essences[0], " I"));
            essences[1] = string(abi.encodePacked(essences[1], " I"));
            essences[2] = string(abi.encodePacked(essences[2], " I"));
        }

        return essences;
    }
}

/*
______ _     _____ _____
| ___ \ |   |_   _|_   _|
| |_/ / |     | |   | |
| ___ \ |     | |   | |
| |_/ / |_____| |_  | |
\____/\_____/\___/  \_/
___  ___  ___  ______
|  \/  | / _ \ | ___ \
| .  . |/ /_\ \| |_/ /
| |\/| ||  _  ||  __/
| |  | || | | || |
\_|  |_/\_| |_/\_|

by dom hofmann and friends
*/

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./blitmap-analysis.sol";
import "./string-util.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";

contract Blitmap is ERC721Enumerable {
    struct SVGCursor {
        uint8 x;
        uint8 y;
        string color1;
        string color2;
        string color3;
        string color4;
    }

    struct VariantParents {
        uint256 tokenIdA;
        uint256 tokenIdB;
    }

    struct Creator {
        string name;
        bool isAllowed;
        uint256 availableBalance;
        uint8 remainingMints;
    }

    struct TokenMetadata {
        string name;
        address creator;
        uint8 remainingVariants;
    }

    struct Colors {
        uint[4] r;
        uint[4] g;
        uint[4] b;
    }

    address private _owner;
    mapping (address => Creator) private _allowedList;
    event AddedToAllowedList(address indexed account);
    event RemovedFromAllowedList(address indexed account);
    event Published();
    event MetadataChanged(uint256 indexed tokenId, TokenMetadata indexed newMetadata);

    mapping(uint256 => VariantParents) private _tokenParentIndex;
    mapping(bytes32 => bool) private _tokenPairs;

    bytes[] private _tokenDataIndex;
    TokenMetadata[] private _tokenMetadataIndex;

    string private _uriPrefix;

    uint8 private _numOriginals;
    uint8 private constant _maxNumOriginals = 128;
    uint8 private constant _maxNumVariants = 16;

    bool public published;

    modifier onlyOwner() {
        require(msg.sender == _owner);
        _;
    }

    modifier onlyAllowed() {
        require(isAllowed(msg.sender));
        _;
    }

    constructor() ERC721("Blitmap", "BLIT") {
        _owner = msg.sender;

        published = false;

        setBaseURI("https://api.blitmap.com/v1/metadata/");

        addAllowed(msg.sender, "sara", 128);
    }

    function _baseURI() override internal view virtual returns (string memory) {
        return _uriPrefix;
    }

    function setBaseURI(string memory prefix) public onlyOwner {
        _uriPrefix = prefix;
    }

    function addAllowed(address _address, string memory name, uint8 allowedMints) public onlyOwner {
        Creator memory creator;
        creator.name = name;
        creator.isAllowed = true;
        creator.remainingMints = allowedMints;
        _allowedList[_address] = creator;
        emit AddedToAllowedList(_address);
    }

    function changeMetadataOf(uint256 tokenId, TokenMetadata memory newMetadata) public onlyOwner {
        require(published == false, "b:01"); // only allow changes prior to publishing
        _tokenMetadataIndex[tokenId] = newMetadata;
        emit MetadataChanged(tokenId, newMetadata);
    }

    function publish() public onlyOwner {
        published = true;
        emit Published();
    }

    /*
    function removeAllowed(address _address) public onlyOwner {
        _allowedList[_address].isAllowed = false;
        emit RemovedFromAllowedList(_address);
    }
    */

    function isAllowed(address _address) public view returns (bool) {
        return _allowedList[_address].isAllowed == true;
    }

    function creatorNameOf(address _address) public view returns (string memory) {
        return _allowedList[_address].name;
    }

    function mintOriginal(bytes memory tokenData, string memory name) public onlyAllowed {
        require(published == false, "b:01");
        require(_numOriginals < _maxNumOriginals, "b:03");
        require(tokenData.length == 268, "b:04"); // any combination of 268 bytes is technically a valid blit
        require(bytes(name).length > 0 && bytes(name).length < 11, "b:05");
        require(_allowedList[msg.sender].remainingMints > 0, "b:06");

        uint256 tokenId = totalSupply();

        _tokenDataIndex.push(tokenData);

        TokenMetadata memory metadata;
        metadata.name = name;
        metadata.remainingVariants = _maxNumVariants;
        metadata.creator = msg.sender;
        _allowedList[msg.sender].remainingMints--;
        _tokenMetadataIndex.push(metadata);

        _numOriginals++;

        _safeMint(msg.sender, tokenId);
    }

    /*
    function remainingNumOriginals() public view returns (uint8) {
        return _maxNumOriginals - _numOriginals;
    }

    function remainingNumMints(address _address) public view returns (uint8) {
        return _allowedList[_address].remainingMints;
    }

    function allowedNumOriginals() public pure returns (uint8) {
        return _maxNumOriginals;
    }

    function allowedNumVariants() public pure returns (uint8) {
        return _maxNumVariants;
    }

    function availableBalanceForCreator(address creatorAddress) public view returns (uint256) {
        return _allowedList[creatorAddress].availableBalance;
    }

    function withdrawAvailableBalance() public onlyAllowed {
        uint256 withdrawAmount = _allowedList[msg.sender].availableBalance;
        _allowedList[msg.sender].availableBalance = 0;
        payable(msg.sender).transfer(withdrawAmount);
    }
    */

    function mintVariant(uint256 tokenIdA, uint256 tokenIdB) public payable {
        require(msg.value == 0.1 ether);
        require(published == true, "b:02");
        require(_exists(tokenIdA) && _exists(tokenIdB), "b:07");
        require(tokenIdA != tokenIdB, "b:08");
        require(tokenRemainingVariantsOf(tokenIdA) > 0, "b:09");
        require(tokenIsOriginal(tokenIdA) && tokenIsOriginal(tokenIdB), "b:10");

        // a given pair can only be minted once
        bytes32 pairHash = keccak256(abi.encodePacked(tokenIdA, tokenIdB));
        require(_tokenPairs[pairHash] == false, "b:11");

        uint256 variantTokenId = totalSupply();

        VariantParents memory parents;
        parents.tokenIdA = tokenIdA;
        parents.tokenIdB = tokenIdB;

        _tokenMetadataIndex[tokenIdA].remainingVariants--;

        // don't need to write real data here since we can assemble sibling data from parent data
        _tokenDataIndex.push(hex"00");

        TokenMetadata memory metadata;
        metadata.name = "";
        metadata.remainingVariants = 0;
        metadata.creator = msg.sender;
        _tokenMetadataIndex.push(metadata);

        _tokenParentIndex[variantTokenId] = parents;
        _tokenPairs[pairHash] = true;
        _safeMint(msg.sender, variantTokenId);

        _allowedList[_tokenMetadataIndex[tokenIdA].creator].availableBalance += 0.0875 ether;
        _allowedList[_tokenMetadataIndex[tokenIdB].creator].availableBalance += 0.0125 ether;
    }

    function tokenNameOf(uint256 tokenId) public view returns (string memory) {
        string memory name;
        if (tokenIsOriginal(tokenId)) {
            name = _tokenMetadataIndex[tokenId].name;
        } else {
            VariantParents memory parents = _tokenParentIndex[tokenId];
            name = string(abi.encodePacked(tokenNameOf(parents.tokenIdA), " ", tokenNameOf(parents.tokenIdB)));
        }

        string[] memory components = StringUtil.titleCase(name);
        string memory titleCaseName;
        for (uint8 i = 0; i < components.length; ++i) {
            if (i == 0) {
                titleCaseName = components[i];
            } else {
                titleCaseName = string(abi.encodePacked(titleCaseName, " ", components[i]));
            }
        }

        return titleCaseName;
    }

    function tokenIsOriginal(uint256 tokenId) public view returns (bool) {
        return (_tokenDataIndex[tokenId].length == 268);
    }

    function tokenParentsOf(uint256 tokenId) public view returns (uint256, uint256) {
        require(!tokenIsOriginal(tokenId));
        return (_tokenParentIndex[tokenId].tokenIdA, _tokenParentIndex[tokenId].tokenIdB);
    }

    function tokenCreatorOf(uint256 tokenId) public view returns (address) {
        return _tokenMetadataIndex[tokenId].creator;
    }

    /*
    function tokenCreatorNameOf(uint256 tokenId) public view returns (string memory) {
        return _allowedList[tokenCreatorOf(tokenId)].name;
    }
    */

    function tokenDataOf(uint256 tokenId) public view returns (bytes memory) {
        bytes memory data = _tokenDataIndex[tokenId];
        if (tokenIsOriginal(tokenId)) {
            return data;
        }

        bytes memory tokenParentData = _tokenDataIndex[_tokenParentIndex[tokenId].tokenIdA];
        bytes memory tokenPaletteData = _tokenDataIndex[_tokenParentIndex[tokenId].tokenIdB];
        for (uint8 i = 0; i < 12; ++i) {
            // overwrite palette data with parent B's palette data
            tokenParentData[i] = tokenPaletteData[i];
        }

        return tokenParentData;
    }

    function tokenRemainingVariantsOf(uint256 tokenId) public view returns (uint256) {
        if (!tokenIsOriginal(tokenId)) {
            return 0;
        }
        return _tokenMetadataIndex[tokenId].remainingVariants;
    }

    function uintToHexDigit(uint8 d) internal pure returns (bytes1) {
        if (0 <= d && d <= 9) {
            return bytes1(uint8(bytes1('0')) + d);
        } else if (10 <= uint8(d) && uint8(d) <= 15) {
            return bytes1(uint8(bytes1('a')) + d - 10);
        }
        revert();
    }

    function uintToHexString(uint a) internal pure returns (string memory) {
        uint count = 0;
        uint b = a;
        while (b != 0) {
            count++;
            b /= 16;
        }
        bytes memory res = new bytes(count);
        for (uint i=0; i<count; ++i) {
            b = a % 16;
            res[count - i - 1] = uintToHexDigit(uint8(b));
            a /= 16;
        }

        string memory str = string(res);
        if (bytes(str).length == 0) {
            return "00";
        } else if (bytes(str).length == 1) {
            return string(abi.encodePacked("0", str));
        }
        return str;
    }

    function byteToUint(bytes1 b) internal pure returns (uint) {
        return uint(uint8(b));
    }

    function byteToHexString(bytes1 b) internal pure returns (string memory) {
        return uintToHexString(byteToUint(b));
    }

    function bitTest(bytes1 aByte, uint8 index) internal pure returns (bool) {
        return uint8(aByte) >> index & 1 == 1;
    }

    function colorIndex(bytes1 aByte, uint8 index1, uint8 index2) internal pure returns (uint) {
        if (bitTest(aByte, index2) && bitTest(aByte, index1)) {
            return 3;
        } else if (bitTest(aByte, index2) && !bitTest(aByte, index1)) {
            return 2;
        } else if (!bitTest(aByte, index2) && bitTest(aByte, index1)) {
            return 1;
        }
        return 0;
    }

    function pixel4(string[32] memory lookup, SVGCursor memory pos) internal pure returns (string memory) {
        return string(abi.encodePacked(
                '<rect fill="', pos.color1, '" x="', lookup[pos.x], '" y="', lookup[pos.y], '" width="1.5" height="1.5" />',
                '<rect fill="', pos.color2, '" x="', lookup[pos.x + 1], '" y="', lookup[pos.y], '" width="1.5" height="1.5" />',

                string(abi.encodePacked(
                    '<rect fill="', pos.color3, '" x="', lookup[pos.x + 2], '" y="', lookup[pos.y], '" width="1.5" height="1.5" />',
                    '<rect fill="', pos.color4, '" x="', lookup[pos.x + 3], '" y="', lookup[pos.y], '" width="1.5" height="1.5" />'
                ))
            ));
    }

    function tokenSvgDataOf(uint256 tokenId) public view returns (string memory) {
        string memory svgString = '<?xml version="1.0" encoding="UTF-8" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" version="1.1" viewBox="0 0 32 32">';

        string[32] memory lookup = [
        "0", "1", "2", "3", "4", "5", "6", "7",
        "8", "9", "10", "11", "12", "13", "14", "15",
        "16", "17", "18", "19", "20", "21", "22", "23",
        "24", "25", "26", "27", "28", "29", "30", "31"
        ];

        SVGCursor memory pos;

        bytes memory data = tokenDataOf(tokenId);

        string[4] memory colors = [
        string(abi.encodePacked("#", byteToHexString(data[0]), byteToHexString(data[1]), byteToHexString(data[2]))),
        string(abi.encodePacked("#", byteToHexString(data[3]), byteToHexString(data[4]), byteToHexString(data[5]))),
        string(abi.encodePacked("#", byteToHexString(data[6]), byteToHexString(data[7]), byteToHexString(data[8]))),
        string(abi.encodePacked("#", byteToHexString(data[9]), byteToHexString(data[10]), byteToHexString(data[11])))
        ];

        string[8] memory p;

        for (uint i = 12; i < 268; i += 8) {
            pos.color1 =  colors[colorIndex(data[i], 6, 7)];
            pos.color2 =  colors[colorIndex(data[i], 4, 5)];
            pos.color3 =  colors[colorIndex(data[i], 2, 3)];
            pos.color4 =  colors[colorIndex(data[i], 0, 1)];
            p[0] = pixel4(lookup, pos);
            pos.x += 4;

            pos.color1 =  colors[colorIndex(data[i + 1], 6, 7)];
            pos.color2 =  colors[colorIndex(data[i + 1], 4, 5)];
            pos.color3 =  colors[colorIndex(data[i + 1], 2, 3)];
            pos.color4 =  colors[colorIndex(data[i + 1], 0, 1)];
            p[1] = pixel4(lookup, pos);
            pos.x += 4;

            pos.color1 =  colors[colorIndex(data[i + 2], 6, 7)];
            pos.color2 =  colors[colorIndex(data[i + 2], 4, 5)];
            pos.color3 =  colors[colorIndex(data[i + 2], 2, 3)];
            pos.color4 =  colors[colorIndex(data[i + 2], 0, 1)];
            p[2] = pixel4(lookup, pos);
            pos.x += 4;

            pos.color1 =  colors[colorIndex(data[i + 3], 6, 7)];
            pos.color2 =  colors[colorIndex(data[i + 3], 4, 5)];
            pos.color3 =  colors[colorIndex(data[i + 3], 2, 3)];
            pos.color4 =  colors[colorIndex(data[i + 3], 0, 1)];
            p[3] = pixel4(lookup, pos);
            pos.x += 4;

            pos.color1 =  colors[colorIndex(data[i + 4], 6, 7)];
            pos.color2 =  colors[colorIndex(data[i + 4], 4, 5)];
            pos.color3 =  colors[colorIndex(data[i + 4], 2, 3)];
            pos.color4 =  colors[colorIndex(data[i + 4], 0, 1)];
            p[4] = pixel4(lookup, pos);
            pos.x += 4;

            pos.color1 =  colors[colorIndex(data[i + 5], 6, 7)];
            pos.color2 =  colors[colorIndex(data[i + 5], 4, 5)];
            pos.color3 =  colors[colorIndex(data[i + 5], 2, 3)];
            pos.color4 =  colors[colorIndex(data[i + 5], 0, 1)];
            p[5] = pixel4(lookup, pos);
            pos.x += 4;

            pos.color1 =  colors[colorIndex(data[i + 6], 6, 7)];
            pos.color2 =  colors[colorIndex(data[i + 6], 4, 5)];
            pos.color3 =  colors[colorIndex(data[i + 6], 2, 3)];
            pos.color4 =  colors[colorIndex(data[i + 6], 0, 1)];
            p[6] = pixel4(lookup, pos);
            pos.x += 4;

            pos.color1 =  colors[colorIndex(data[i + 7], 6, 7)];
            pos.color2 =  colors[colorIndex(data[i + 7], 4, 5)];
            pos.color3 =  colors[colorIndex(data[i + 7], 2, 3)];
            pos.color4 =  colors[colorIndex(data[i + 7], 0, 1)];
            p[7] = pixel4(lookup, pos);
            pos.x += 4;

            svgString = string(abi.encodePacked(svgString, p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]));

            if (pos.x >= 32) {
                pos.x = 0;
                pos.y += 1;
            }
        }

        svgString = string(abi.encodePacked(svgString, "</svg>"));
        return svgString;
    }

    function tokenRGBColorsOf(uint256 tokenId) public view returns (BlitmapAnalysis.Colors memory) {
        return BlitmapAnalysis.tokenRGBColorsOf(tokenDataOf(tokenId));
    }

    function tokenSlabsOf(uint256 tokenId) public view returns (string[4] memory) {
        return BlitmapAnalysis.tokenSlabsOf(tokenDataOf(tokenId));
    }

    function tokenAffinityOf(uint256 tokenId) public view returns (string[3] memory) {
        return BlitmapAnalysis.tokenAffinityOf(tokenDataOf(tokenId));
    }
}

/*
errors:
01: This can only be done before the project has been published.
02: This can only be done after the project has been published.
03: The maximum number of originals has been minted.
04: Blitmaps must be exactly 268 bytes.
05: Blitmaps must have a title must be between 1 and 10 characters.
06: You have reached your quota for minted originals.
07: One of the originals in this combination doesn't exist.
08: An original cannot be combined with itself.
09: This original has sold out all of its siblings.
10: Both blitmaps in this combination must be originals.
11: A sibling with this combination already exists.
*/

{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "istanbul",
  "libraries": {
    "/Users/Shared/Code/experimental/flipmaps/blitmaps/contracts/blitmap-analysis.sol": {
      "BlitmapAnalysis": "0x7d2e3eba0119f38cca36a1cf4aeb9ffd38bf9210"
    }
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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s":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"value","type":"uint256"}],"name":"toString","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenAffinityOf","outputs":[{"internalType":"string[3]","name":"","type":"string[3]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenDataOf","outputs":[{"internalType":"bytes","name":"","type":"bytes"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenIsOriginal","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenParentsOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenRGBColorsOf","outputs":[{"components":[{"internalType":"uint256[4]","name":"r","type":"uint256[4]"},{"internalType":"uint256[4]","name":"g","type":"uint256[4]"},{"internalType":"uint256[4]","name":"b","type":"uint256[4]"}],"internalType":"struct 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0000000000000000000000008d04a8c79ceb0889bdd12acdf3fa9d207ed3ff63

-----Decoded View---------------
Arg [0] : _blitAddress (address): 0x8d04a8c79cEB0889Bdd12acdF3Fa9D207eD3Ff63

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000008d04a8c79ceb0889bdd12acdf3fa9d207ed3ff63