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// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

/// @title Connectors
/// @author swa.eth

/*********************************
 *           0       0           *
 * |░░░|░░░|░░░|░░░|░░░|░░░|░░░| *
 * |░░░|░░░|░░░|░░░|░░░|░░░|░░░| *
 * |░░░|░░░|░░░|░░░|░░░|░░░|░░░| *
 * |░░░|░░░|░░░|░░░|░░░|░░░|░░░| *
 * |░░░|░░░|░░░|░░░|░░░|░░░|░░░| *
 * |░░░|░░░|░░░|░░░|░░░|░░░|░░░| *
 * |                           | *
 *********************************/

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/utils/ERC721Holder.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "src/Generator.sol";
import "src/interfaces/IConnectors.sol";
import "src/lib/Base64.sol";

/// @notice Just a friendly on-chain game of Connect Four
contract Connectors is IConnectors, ERC721, ERC721Holder, Ownable {
    using Strings for uint8;
    using Strings for uint160;
    using Strings for uint256;
    /// @dev Interface identifier for royalty standard
    bytes4 constant _INTERFACE_ID_ERC2981 = 0x2a55205a;
    /// @notice Maximum supply of NFTs
    uint16 public constant MAX_SUPPLY = 420;
    /// @notice Address of Generator contract
    address public immutable generator;
    /// @notice Current supply of NFTs
    uint16 public totalSupply;
    /// @notice Ether amount required to play (per player)
    uint64 public fee = 0.0420 ether;
    /// @notice Mapping of game ID to game info
    mapping(uint256 => Game) public games;

    /// @dev Deploys Generator contract
    constructor() payable ERC721("Connectors", "C4") {
        generator = address(new Generator());
    }

    /// @notice Creates new game and mints empty game board
    /// @dev Game can only become active once opponent calls begin
    /// @param _opponent Address of opponent
    function challenge(address _opponent) external payable {
        // Reverts if caller is also the opponent
        if (msg.sender == _opponent) revert InvalidMatchup();
        // Reverts if max supply has been minted
        if (totalSupply == MAX_SUPPLY) revert InsufficientSupply();
        // Reverts if payment amount is incorrect
        if (msg.value != fee) revert InvalidPayment();

        // Initializes game info
        Game storage game = games[++totalSupply];
        game.player1 = msg.sender;
        game.player2 = _opponent;
        game.turn = PLAYER_2;

        // Mints new board to this contract
        _safeMint(address(this), totalSupply);

        // Emits event for challenging opponent
        emit Challenge(totalSupply, msg.sender, _opponent);
    }

    /// @notice Activates new game and executes first move on board
    /// @dev Column numbers are zero-indexed
    /// @param _gameId ID of the game
    /// @param _col Value of column placement on board (0-6)
    function begin(uint256 _gameId, uint8 _col) external payable {
        // Reverts if game does not exist
        if (_gameId == 0 || _gameId > totalSupply) revert InvalidGame();
        Game storage game = games[_gameId];
        uint8 playerId = _getPlayerId(game, msg.sender);
        // Reverts if game state is not Inactive
        if (game.state != State.INACTIVE) revert InvalidState();
        // Reverts if caller is not authorized to execute move
        if (game.turn != playerId) revert NotAuthorized();
        // Reverts if payment amount is incorrect
        if (msg.value != fee) revert InvalidPayment();

        // Sets game state to Active
        game.state = State.ACTIVE;

        // Emits event for beginning a new game
        emit Begin(_gameId, msg.sender, game.state);

        // Executes first move on board
        move(_gameId, _col);
    }

    /// @notice Executes next placement on active board
    /// @dev Column numbers are zero-indexed
    /// @param _gameId ID of the game
    /// @param _col Value of column placement on board (0-6)
    function move(uint256 _gameId, uint8 _col) public returns (bool result) {
        // Reverts if game does not exist
        if (_gameId == 0 || _gameId > totalSupply) revert InvalidGame();
        Game storage game = games[_gameId];
        uint8[COL][ROW] storage board = game.board;
        uint8 playerId = _getPlayerId(game, msg.sender);
        uint8 row = getNextRow(board, _col);
        // Reverts if game state is not Active
        if (game.state != State.ACTIVE) revert InvalidState();
        // Reverts if caller is not authorized to execute move
        if (game.turn != playerId) revert NotAuthorized();
        // Reverts if column is fully occupied
        if (board[row][_col] != 0) revert InvalidMove();

        // Increments total number of moves made
        ++game.moves;
        uint8 moves = game.moves;

        // Records player move
        game.row = row;
        game.col = _col;
        board[row][_col] = playerId;

        // Emits event for creating new move on board
        emit Move(_gameId, msg.sender, moves, row, _col);

        // Only checks board for win if minimum number of moves have been made
        if (moves > 6) result = _checkBoard(playerId, row, _col, board);

        // Checks if game has been won
        if (result) {
            _success(_gameId, game);
        } else {
            // Updates player turn based on caller
            game.turn = (msg.sender == game.player1) ? PLAYER_2 : PLAYER_1;

            // Checks if number of moves has reached maximum moves
            if (moves == ROW * COL) _draw(_gameId, game);
        }
    }

    /// @notice Sets fee amount required to play game
    /// @param _fee Amount in ether
    function setFee(uint64 _fee) external payable onlyOwner {
        fee = _fee;
    }

    /// @notice Withdraws balance from this contract
    /// @param _to Target address for transferring balance to
    function withdraw(address payable _to) external payable onlyOwner {
        (bool success, ) = _to.call{value: address(this).balance}("");
        if (!success) revert TransferFailed();
    }

    /// @notice Gets the entire column for a given row
    /// @param _gameId ID of the game
    /// @param _row Value of row number on board
    function getColumn(uint256 _gameId, uint8 _row) external view returns (uint8[COL] memory) {
        Game memory game = games[_gameId];
        return game.board[_row];
    }

    /// @notice Returns royalty information for secondary sales
    function royaltyInfo(
        uint256 /* _tokenId */,
        uint256 _salePrice
    ) external view returns (address receiver, uint256 royalty) {
        receiver = owner();
        royalty = (_salePrice * 1000) / 10000;
    }

    /// @notice Supports interface for ERC-165 implementation
    function supportsInterface(bytes4 interfaceId) public view override returns (bool) {
        return interfaceId == _INTERFACE_ID_ERC2981 || super.supportsInterface(interfaceId); // ERC165 Interface ID for ERC2981
    }

    /// @notice Gets metadata of token in JSON format
    function tokenURI(uint256 _tokenId) public view virtual override returns (string memory) {
        _requireMinted(_tokenId);

        Game memory game = games[_tokenId];
        uint8[COL][ROW] memory board = game.board;
        address player1 = game.player1;
        address player2 = game.player2;
        string memory name = (game.state == State.SUCCESS)
            ? string.concat("Connector #", _tokenId.toString())
            : string.concat("Game #", _tokenId.toString());
        string memory description = "Just a friendly on-chain game of Connect Four. Your move anon.";
        string memory gameTraits = _generateGameTraits(game);
        string memory playerTraits = _generatePlayerTraits(_tokenId, player1, player2);
        string memory image = Base64.encode(
            abi.encodePacked(IGenerator(generator).generateSVG(_tokenId, game.row, game.col, board))
        );

        return
            string.concat(
                "data:application/json;base64,",
                Base64.encode(
                    abi.encodePacked(
                        string.concat(
                            '{"name":"',
                                name,
                            '",',
                            '"description":"',
                                description,
                            '",',
                            '"image": "data:image/svg+xml;base64,',
                                image,
                            '",',
                            '"attributes": [',
                                playerTraits,
                                gameTraits,
                            "]}"
                        )
                    )
                )
            );
    }

    /// @notice Gets the next row value for the given column
    /// @param _board Current state of the game board
    /// @param _col Value of the column placement
    function getNextRow(uint8[COL][ROW] memory _board, uint8 _col) public pure returns (uint8) {
        unchecked {
            for (uint8 row; row < ROW; ++row) {
                if (_board[row][_col] == 0)  {
                    return row;
                }
            }
        }

        return 0;
    }

    /// @dev Sets game as success and transfers connector to winner
    function _success(uint256 _gameId, Game storage _game) internal {
        _game.state = State.SUCCESS;
        emit Result(_gameId, msg.sender, _game.state, _game.board);

        _burn(_gameId);
        _safeMint(msg.sender, _gameId);
    }

    /// @dev Sets game as draw
    function _draw(uint256 _gameId, Game storage _game) internal {
        _game.turn = 0;
        _game.state = State.DRAW;

        emit Result(_gameId, address(0), _game.state, _game.board);
    }

    /// @dev Checks if move wins game in any of the four directions
    function _checkBoard(
        uint8 _playerId,
        uint8 _row,
        uint8 _col,
        uint8[COL][ROW] storage _board
    ) internal view returns (bool result) {
        result = _checkHorizontal(_playerId, _row, _col, _board);
        if (!result) result = _checkVertical(_playerId, _row, _col, _board);
        if (!result) result = _checkAscending(_playerId, _row, _col, _board);
        if (!result) result = _checkDescending(_playerId, _row, _col, _board);
    }

    /// @dev Checks horizontal placement of move on board
    function _checkHorizontal(
        uint8 _playerId,
        uint8 _row,
        uint8 _col,
        uint8[COL][ROW] storage _board
    ) internal view returns (bool result) {
        uint8 i;
        uint8 counter;
        unchecked {
            for (i = 1; i < 4; ++i) {
                if (_col == 0) break;
                if (_board[_row][_col - i] == _playerId) {
                    ++counter;
                } else {
                    break;
                }
                if (_col - i == 0) break;
            }

            for (i = 1; i < 4; ++i) {
                if (_col + i == COL) break;
                if (_board[_row][_col + i] == _playerId) {
                    ++counter;
                } else {
                    break;
                }
            }
        }

        if (counter > 2) result = true;
    }

    /// @dev Checks vertical placement of move on board
    function _checkVertical(
        uint8 _playerId,
        uint8 _row,
        uint8 _col,
        uint8[COL][ROW] storage _board
    ) internal view returns (bool result) {
        uint8 i;
        uint8 counter;
        unchecked {
            for (i = 1; i < 4; ++i) {
                if (_row == 0) break;
                if (_board[_row - i][_col] == _playerId) {
                    ++counter;
                } else {
                    break;
                }
                if (_row - i == 0) break;
            }

            for (i = 1; i < 4; ++i) {
                if (_row + i == ROW) break;
                if (_board[_row + i][_col] == _playerId) {
                    ++counter;
                } else {
                    break;
                }
            }
        }

        if (counter > 2) result = true;
    }

    /// @dev Checks diagonal placement of move ascending from left to right
    function _checkAscending(
        uint8 _playerId,
        uint8 _row,
        uint8 _col,
        uint8[COL][ROW] storage _board
    ) internal view returns (bool result) {
        uint8 i;
        uint8 counter;
        unchecked {
            for (i = 1; i < 4; ++i) {
                if (_row == 0 || _col == 0) break;
                if (_board[_row - i][_col - i] == _playerId) {
                    ++counter;
                } else {
                    break;
                }
                if (_row - i == 0 || _col - i == 0) break;
            }

            for (i = 1; i < 4; ++i) {
                if (_row + i == ROW || _col + i == COL) break;
                if (_board[_row + i][_col + i] == _playerId) {
                    ++counter;
                } else {
                    break;
                }
            }
        }

        if (counter > 2) result = true;
    }

    /// @dev Checks diagonal placement of move descending from left to right
    function _checkDescending(
        uint8 _playerId,
        uint8 _row,
        uint8 _col,
        uint8[COL][ROW] storage _board
    ) internal view returns (bool result) {
        uint8 i;
        uint8 counter;
        unchecked {
            for (i = 1; i < 4; ++i) {
                if (_row + i == ROW || _col == 0) break;
                if (_board[_row + i][_col - i] == _playerId) {
                    ++counter;
                } else {
                    break;
                }
                if (_col - i == 0) break;
            }

            for (i = 1; i < 4; ++i) {
                if (_row == 0 || _col + i == COL) break;
                if (_board[_row - i][_col + i] == _playerId) {
                    ++counter;
                } else {
                    break;
                }
                if (_row - i == 0) break;
            }
        }

        if (counter > 2) result = true;
    }

    /// @dev Generates JSON formatted data of game traits
    function _generateGameTraits(Game memory _game) internal view returns (string memory) {
        string memory moves = _game.moves.toString();
        string memory status = IGenerator(generator).getStatus(_game.state);
        string memory label = (_game.state == State.SUCCESS) ? "Winner" : "Turn";
        string memory turn = uint160(address(0)).toHexString(20);
        if (_game.turn == PLAYER_1) {
            turn = uint160(_game.player1).toHexString(20);
        } else if (_game.turn == PLAYER_2) {
            turn = uint160(_game.player2).toHexString(20);
        }
        string memory latest = string.concat(
            "(",
            _game.row.toString(),
            ", ",
            _game.col.toString(),
            ")"
        );

        return
            string(
                abi.encodePacked(
                    '{"trait_type":"Latest", "value":"',
                        latest,
                    '"},',
                    '{"trait_type":"Moves", "value":"',
                        moves,
                    '"},',
                    '{"trait_type":"Status", "value":"',
                        status,
                    '"},',
                    '{"trait_type":"',
                        label,
                    '", "value":"',
                        turn,
                    '"}'
                )
            );
    }

    /// @dev Generates JSON formatted data of player traits
    function _generatePlayerTraits(
        uint256 _gameId,
        address _player1,
        address _player2
    ) internal view returns (string memory) {
        string memory player1 = uint160(_player1).toHexString(20);
        string memory player2 = uint160(_player2).toHexString(20);
        (string memory checker1, string memory checker2) = IGenerator(generator).getCheckers(_gameId);

        return
            string(
                abi.encodePacked(
                    '{"trait_type":"',
                        checker1,
                    '", "value":"',
                        player1,
                    '"},',
                    '{"trait_type":"',
                        checker2,
                    '", "value":"',
                        player2,
                    '"},'
                )
            );
    }

    /// @dev Gets player ID of caller
    function _getPlayerId(
        Game storage _game,
        address _player
    ) internal view returns (uint8 playerId) {
        if (_player == _game.player1) {
            playerId = PLAYER_1;
        } else if (_player == _game.player2) {
            playerId = PLAYER_2;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

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

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/ERC721.sol)

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: address zero is not a valid owner");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _ownerOf(tokenId);
        require(owner != address(0), "ERC721: invalid token ID");
        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) {
        _requireMinted(tokenId);

        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 overridden 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 token owner or approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        _requireMinted(tokenId);

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_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: caller is not token owner or 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: caller is not token owner or 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 the owner of the `tokenId`. Does NOT revert if token doesn't exist
     */
    function _ownerOf(uint256 tokenId) internal view virtual returns (address) {
        return _owners[tokenId];
    }

    /**
     * @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 _ownerOf(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) {
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == 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, 1);

        // Check that tokenId was not minted by `_beforeTokenTransfer` hook
        require(!_exists(tokenId), "ERC721: token already minted");

        unchecked {
            // Will not overflow unless all 2**256 token ids are minted to the same owner.
            // Given that tokens are minted one by one, it is impossible in practice that
            // this ever happens. Might change if we allow batch minting.
            // The ERC fails to describe this case.
            _balances[to] += 1;
        }

        _owners[tokenId] = to;

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

        _afterTokenTransfer(address(0), to, tokenId, 1);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     * This is an internal function that does not check if the sender is authorized to operate on the token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId, 1);

        // Update ownership in case tokenId was transferred by `_beforeTokenTransfer` hook
        owner = ERC721.ownerOf(tokenId);

        // Clear approvals
        delete _tokenApprovals[tokenId];

        unchecked {
            // Cannot overflow, as that would require more tokens to be burned/transferred
            // out than the owner initially received through minting and transferring in.
            _balances[owner] -= 1;
        }
        delete _owners[tokenId];

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

        _afterTokenTransfer(owner, address(0), tokenId, 1);
    }

    /**
     * @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 from incorrect owner");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId, 1);

        // Check that tokenId was not transferred by `_beforeTokenTransfer` hook
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");

        // Clear approvals from the previous owner
        delete _tokenApprovals[tokenId];

        unchecked {
            // `_balances[from]` cannot overflow for the same reason as described in `_burn`:
            // `from`'s balance is the number of token held, which is at least one before the current
            // transfer.
            // `_balances[to]` could overflow in the conditions described in `_mint`. That would require
            // all 2**256 token ids to be minted, which in practice is impossible.
            _balances[from] -= 1;
            _balances[to] += 1;
        }
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId, 1);
    }

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

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits an {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Reverts if the `tokenId` has not been minted yet.
     */
    function _requireMinted(uint256 tokenId) internal view virtual {
        require(_exists(tokenId), "ERC721: invalid token ID");
    }

    /**
     * @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 {
                    /// @solidity memory-safe-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens will be transferred to `to`.
     * - When `from` is zero, the tokens will be minted for `to`.
     * - When `to` is zero, ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256, /* firstTokenId */
        uint256 batchSize
    ) internal virtual {
        if (batchSize > 1) {
            if (from != address(0)) {
                _balances[from] -= batchSize;
            }
            if (to != address(0)) {
                _balances[to] += batchSize;
            }
        }
    }

    /**
     * @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`.
     * - When `from` is zero, the tokens were minted for `to`.
     * - When `to` is zero, ``from``'s tokens were burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 firstTokenId,
        uint256 batchSize
    ) internal virtual {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/IERC721.sol)

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`.
     *
     * 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;

    /**
     * @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 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: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * 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 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 the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

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 `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

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
// OpenZeppelin Contracts v4.4.1 (token/ERC721/utils/ERC721Holder.sol)

pragma solidity ^0.8.0;

import "../IERC721Receiver.sol";

/**
 * @dev Implementation of the {IERC721Receiver} interface.
 *
 * Accepts all token transfers.
 * Make sure the contract is able to use its token with {IERC721-safeTransferFrom}, {IERC721-approve} or {IERC721-setApprovalForAll}.
 */
contract ERC721Holder is IERC721Receiver {
    /**
     * @dev See {IERC721Receiver-onERC721Received}.
     *
     * Always returns `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address,
        address,
        uint256,
        bytes memory
    ) public virtual override returns (bytes4) {
        return this.onERC721Received.selector;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or 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 {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

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

pragma solidity ^0.8.0;

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @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] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

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

pragma solidity ^0.8.0;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1);

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator,
        Rounding rounding
    ) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10**64) {
                value /= 10**64;
                result += 64;
            }
            if (value >= 10**32) {
                value /= 10**32;
                result += 32;
            }
            if (value >= 10**16) {
                value /= 10**16;
                result += 16;
            }
            if (value >= 10**8) {
                value /= 10**8;
                result += 8;
            }
            if (value >= 10**4) {
                value /= 10**4;
                result += 4;
            }
            if (value >= 10**2) {
                value /= 10**2;
                result += 2;
            }
            if (value >= 10**1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

import "@openzeppelin/contracts/utils/Strings.sol";
import "src/interfaces/IGenerator.sol";

contract Generator is IGenerator {
    using Strings for uint256;
    string public constant BLUE = "#29335c";
    string public constant RED = "#DB2B39";
    string public constant YELLOW = "#F3A712";

    constructor() payable {}

    function generateSVG(
        uint256 _gameId,
        uint8 _row,
        uint8 _col,
        uint8[COL][ROW] memory _board
    ) external pure returns (string memory svg) {
        string memory board = _generateBoard();
        (string memory base, string memory player1, string memory player2) = _getPalette(_gameId);
        for (uint8 y; y < COL; ++y) {
            board = string.concat(board, _generateGrid(y));
            for (uint8 x; x < ROW; ++x) {
                string memory cell;
                if (_board[x][y] == PLAYER_1) {
                    cell = _generateCell(x, y, _row, _col, player1);
                } else if (_board[x][y] == PLAYER_2) {
                    cell = _generateCell(x, y, _row, _col, player2);
                }
                board = string.concat(board, cell);
            }
            board = string.concat(board, _generateBase(base));
        }
        svg = string.concat(board, "</svg>");
    }

    function getCheckers(
        uint256 _gameId
    ) external pure returns (string memory checker1, string memory checker2) {
        (, string memory player1, string memory player2) = _getPalette(_gameId);
        checker1 = _getColor(player1);
        checker2 = _getColor(player2);
    }

    function getStatus(State _state) external pure returns (string memory status) {
        if (_state == State.INACTIVE) status = "Inactive";
        else if (_state == State.ACTIVE) status = "Active";
        else if (_state == State.SUCCESS) status = "Success";
        else status = "Draw";
    }

    function _generateBoard() internal pure returns (string memory) {
        return
            "<svg viewBox='0 0 700 600' xmlns='http://www.w3.org/2000/svg'><defs><pattern id='cell-pattern' patternUnits='userSpaceOnUse' width='100' height='100'><circle cx='50' cy='50' r='45' fill='black'></circle></pattern><mask id='cell-mask'><rect width='100' height='600' fill='white'></rect><rect width='100' height='600' fill='url(#cell-pattern)'></rect></mask></defs>";
    }

    function _generateGrid(uint256 _col) internal pure returns (string memory) {
        uint256 x = _col * 100;
        string[3] memory grid;
        grid[0] = "<svg x='";
        grid[1] = x.toString();
        grid[2] = "' y='0'>";

        return string(abi.encodePacked(grid[0], grid[1], grid[2]));
    }

    function _generateCell(
        uint256 _x,
        uint256 _y,
        uint8 _row,
        uint8 _col,
        string memory _checker
    ) internal pure returns (string memory cell) {
        uint256 cy = 550 - (_x * 100);
        if (_x == _row && _y == _col) {
            cell = _animateCell(cy, _checker);
        } else {
            cell = _staticCell(cy, _checker);
        }
    }

    function _animateCell(
        uint256 _cy,
        string memory _checker
    ) internal pure returns (string memory) {
        uint256 duration = (_cy / 100 == 0) ? 1 : _cy / 100;
        string memory secs = string.concat(duration.toString(), "s");
        string[7] memory cell;
        cell[0] = "<circle cx='50' r='45' fill='";
        cell[1] = _checker;
        cell[2] = "'><animate attributeName='cy' from='0' to='";
        cell[3] = _cy.toString();
        cell[4] = "' dur='";
        cell[5] = secs;
        cell[6] = "' begin='2s' fill='freeze'></animate></circle>";

        return string(abi.encodePacked(cell[0], cell[1], cell[2], cell[3], cell[4], cell[5], cell[6]));
    }

    function _staticCell(
        uint256 _cy,
        string memory _checker
    ) internal pure returns (string memory) {
        string[5] memory cell;
        cell[0] = "<circle cx='50' cy='";
        cell[1] = _cy.toString();
        cell[2] = "' r='45' fill='";
        cell[3] = _checker;
        cell[4] = "'></circle>";

        return string(abi.encodePacked(cell[0], cell[1], cell[2], cell[3], cell[4]));
    }

    function _generateBase(string memory _base) internal pure returns (string memory) {
        string[3] memory base;
        base[0] = "<rect width='100' height='600' fill='";
        base[1] = _base;
        base[2] = "' mask='url(#cell-mask)'></rect></svg>";

        return string(abi.encodePacked(base[0], base[1], base[2]));
    }

    function _getPalette(
        uint256 _gameId
    ) internal pure returns (string memory base, string memory player1, string memory player2) {
        if (_gameId % 3 == 0) {
            base = RED;
            if (_gameId % 2 == 0) {
                player1 = BLUE;
                player2 = YELLOW;
            } else {
                player1 = YELLOW;
                player2 = BLUE;
            }
        } else if (_gameId % 3 == 1) {
            base = YELLOW;
            if (_gameId % 2 == 0) {
                player1 = RED;
                player2 = BLUE;
            } else {
                player1 = BLUE;
                player2 = RED;
            }
        } else if (_gameId % 3 == 2) {
            base = BLUE;
            if (_gameId % 2 == 0) {
                player1 = RED;
                player2 = YELLOW;
            } else {
                player1 = YELLOW;
                player2 = RED;
            }
        }
    }

    function _getColor(string memory _player) internal pure returns (string memory checker) {
        if (_hashStr(_player) == _hashStr(BLUE)) checker = "Blue";
        else if (_hashStr(_player) == _hashStr(RED)) checker = "Red";
        else checker = "Yellow";
    }

    function _hashStr(string memory _value) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked(_value));
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

uint8 constant COL = 7;
uint8 constant ROW = 6;
uint8 constant PLAYER_1 = 1;
uint8 constant PLAYER_2 = 2;

enum State {
    INACTIVE,
    ACTIVE,
    SUCCESS,
    DRAW
}

struct Game {
    State state;
    uint8 row;
    uint8 col;
    uint8 moves;
    uint8 turn;
    address player1;
    address player2;
    uint8[COL][ROW] board;
}

interface IConnectors {
    error InsufficientSupply();
    error InvalidGame();
    error InvalidMatchup();
    error InvalidMove();
    error InvalidPayment();
    error InvalidState();
    error NotAuthorized();
    error TransferFailed();

    event Challenge(uint256 indexed _gameId, address indexed _player1, address indexed _player2);

    event Begin(uint256 indexed _gameId, address indexed _player2, State indexed _state);

    event Move(
        uint256 indexed _gameId,
        address indexed _player,
        uint8 _moves,
        uint8 _row,
        uint8 _col
    );

    event Result(
        uint256 indexed _gameId,
        address indexed _winner,
        State indexed _state,
        uint8[COL][ROW] _board
    );

    function MAX_SUPPLY() external view returns (uint16);

    function challenge(address _opponent) external payable;

    function begin(uint256 _gameId, uint8 _col) external payable;

    function fee() external view returns (uint64);

    function generator() external view returns (address);

    function getColumn(uint256 _gameId, uint8 _row) external view returns (uint8[COL] memory);

    function getNextRow(uint8[COL][ROW] memory _board, uint8 _col) external view returns (uint8);

    function move(uint256 _gameId, uint8 _col) external returns (bool);

    function setFee(uint64 _fee) external payable;

    function totalSupply() external view returns (uint16);

    function withdraw(address payable _to) external payable;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

import {COL, ROW, PLAYER_1, PLAYER_2, State} from "src/interfaces/IConnectors.sol";

interface IGenerator {
    function BLUE() external view returns (string memory);

    function RED() external view returns (string memory);

    function YELLOW() external view returns (string memory);

    function generateSVG(
        uint256 _gameId,
        uint8 _row,
        uint8 _col,
        uint8[COL][ROW] memory _board
    ) external pure returns (string memory);

    function getCheckers(uint256 _gameId) external pure returns (string memory, string memory);

    function getStatus(State _state) external view returns (string memory);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

library Base64 {
    string internal constant _TABLE =
        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

    function encode(bytes memory data) public pure returns (string memory) {
        if (data.length == 0) return "";

        string memory table = _TABLE;
        string memory result = new string(4 * ((data.length + 2) / 3));

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

            for {
                let dataPtr := data
                let endPtr := add(data, mload(data))
            } lt(dataPtr, endPtr) {

            } {
                dataPtr := add(dataPtr, 3)
                let input := mload(dataPtr)
                mstore8(resultPtr, mload(add(tablePtr, and(shr(18, input), 0x3F))))
                resultPtr := add(resultPtr, 1)
                mstore8(resultPtr, mload(add(tablePtr, and(shr(12, input), 0x3F))))
                resultPtr := add(resultPtr, 1)
                mstore8(resultPtr, mload(add(tablePtr, and(shr(6, input), 0x3F))))
                resultPtr := add(resultPtr, 1)
                mstore8(resultPtr, mload(add(tablePtr, and(input, 0x3F))))
                resultPtr := add(resultPtr, 1)
            }
            switch mod(mload(data), 3)
            case 1 {
                mstore8(sub(resultPtr, 1), 0x3d)
                mstore8(sub(resultPtr, 2), 0x3d)
            }
            case 2 {
                mstore8(sub(resultPtr, 1), 0x3d)
            }
        }
        return result;
    }
}

{
  "remappings": [
    "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "libraries": {
    "src/lib/Base64.sol": {
      "Base64": "0x9186675ed37c80b565414b970d226d8dbe1094da"
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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State","name":"_state","type":"uint8"}],"name":"Begin","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"_gameId","type":"uint256"},{"indexed":true,"internalType":"address","name":"_player1","type":"address"},{"indexed":true,"internalType":"address","name":"_player2","type":"address"}],"name":"Challenge","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"_gameId","type":"uint256"},{"indexed":true,"internalType":"address","name":"_player","type":"address"},{"indexed":false,"internalType":"uint8","name":"_moves","type":"uint8"},{"indexed":false,"internalType":"uint8","name":"_row","type":"uint8"},{"indexed":false,"internalType":"uint8","name":"_col","type":"uint8"}],"name":"Move","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"_gameId","type":"uint256"},{"indexed":true,"internalType":"address","name":"_winner","type":"address"},{"indexed":true,"internalType":"enum State","name":"_state","type":"uint8"},{"indexed":false,"internalType":"uint8[7][6]","name":"_board","type":"uint8[7][6]"}],"name":"Result","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"MAX_SUPPLY","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_gameId","type":"uint256"},{"internalType":"uint8","name":"_col","type":"uint8"}],"name":"begin","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"_opponent","type":"address"}],"name":"challenge","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"fee","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"games","outputs":[{"internalType":"enum State","name":"state","type":"uint8"},{"internalType":"uint8","name":"row","type":"uint8"},{"internalType":"uint8","name":"col","type":"uint8"},{"internalType":"uint8","name":"moves","type":"uint8"},{"internalType":"uint8","name":"turn","type":"uint8"},{"internalType":"address","name":"player1","type":"address"},{"internalType":"address","name":"player2","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"generator","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_gameId","type":"uint256"},{"internalType":"uint8","name":"_row","type":"uint8"}],"name":"getColumn","outputs":[{"internalType":"uint8[7]","name":"","type":"uint8[7]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint8[7][6]","name":"_board","type":"uint8[7][6]"},{"internalType":"uint8","name":"_col","type":"uint8"}],"name":"getNextRow","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_gameId","type":"uint256"},{"internalType":"uint8","name":"_col","type":"uint8"}],"name":"move","outputs":[{"internalType":"bool","name":"result","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"onERC721Received","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"_salePrice","type":"uint256"}],"name":"royaltyInfo","outputs":[{"internalType":"address","name":"receiver","type":"address"},{"internalType":"uint256","name":"royalty","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint64","name":"_fee","type":"uint64"}],"name":"setFee","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"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":"_tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"}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payable","name":"_to","type":"address"}],"name":"withdraw","outputs":[],"stateMutability":"payable","type":"function"}]

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