soulBoundMedal.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;


// _
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
/**
 * @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);
}

// _
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721.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 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 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);
}

// _
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)
/**
 * @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);
}

// _
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.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);
}

// _
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)
/**
 * @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 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);
            }
        }
    }
}

// _
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
/**
 * @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;
    }
}

// _
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)
/**
 * @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);
    }
}

// _
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.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;
    }
}

// _
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/ERC721.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 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 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 {
        _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: 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 || 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);

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

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

        _afterTokenTransfer(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);

        _afterTokenTransfer(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 from incorrect owner");
        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);

        _afterTokenTransfer(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 Approve `operator` to operate on all of `owner` tokens
     *
     * Emits a {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 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 {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}

// _
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

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

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

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

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

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

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

// _
// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)
/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

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

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

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
    function set(Counter storage counter, uint256 value) internal {
        counter._value = value;
    }
}

// _
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Base64.sol)
/**
 * @dev Provides a set of functions to operate with Base64 strings.
 *
 * _Available since v4.5._
 */
library Base64 {
    /**
     * @dev Base64 Encoding/Decoding Table
     */
    string internal constant _TABLE = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

    /**
     * @dev Converts a `bytes` to its Bytes64 `string` representation.
     */
    function encode(bytes memory data) internal pure returns (string memory) {
        /**
         * Inspired by Brecht Devos (Brechtpd) implementation - MIT licence
         * https://github.com/Brechtpd/base64/blob/e78d9fd951e7b0977ddca77d92dc85183770daf4/base64.sol
         */
        if (data.length == 0) return "";

        // Loads the table into memory
        string memory table = _TABLE;

        // Encoding takes 3 bytes chunks of binary data from `bytes` data parameter
        // and split into 4 numbers of 6 bits.
        // The final Base64 length should be `bytes` data length multiplied by 4/3 rounded up
        // - `data.length + 2`  -> Round up
        // - `/ 3`              -> Number of 3-bytes chunks
        // - `4 *`              -> 4 characters for each chunk
        string memory result = new string(4 * ((data.length + 2) / 3));

        assembly {
            // Prepare the lookup table (skip the first "length" byte)
            let tablePtr := add(table, 1)

            // Prepare result pointer, jump over length
            let resultPtr := add(result, 32)

            // Run over the input, 3 bytes at a time
            for {
                let dataPtr := data
                let endPtr := add(data, mload(data))
            } lt(dataPtr, endPtr) {

            } {
                // Advance 3 bytes
                dataPtr := add(dataPtr, 3)
                let input := mload(dataPtr)

                // To write each character, shift the 3 bytes (18 bits) chunk
                // 4 times in blocks of 6 bits for each character (18, 12, 6, 0)
                // and apply logical AND with 0x3F which is the number of
                // the previous character in the ASCII table prior to the Base64 Table
                // The result is then added to the table to get the character to write,
                // and finally write it in the result pointer but with a left shift
                // of 256 (1 byte) - 8 (1 ASCII char) = 248 bits

                mstore8(resultPtr, mload(add(tablePtr, and(shr(18, input), 0x3F))))
                resultPtr := add(resultPtr, 1) // Advance

                mstore8(resultPtr, mload(add(tablePtr, and(shr(12, input), 0x3F))))
                resultPtr := add(resultPtr, 1) // Advance

                mstore8(resultPtr, mload(add(tablePtr, and(shr(6, input), 0x3F))))
                resultPtr := add(resultPtr, 1) // Advance

                mstore8(resultPtr, mload(add(tablePtr, and(input, 0x3F))))
                resultPtr := add(resultPtr, 1) // Advance
            }

            // When data `bytes` is not exactly 3 bytes long
            // it is padded with `=` characters at the end
            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;
    }
}

// _
interface ISoulBound is IERC721 {
    /**
     * @dev if the token is soulbound
     * @return true if the token is soulbound
     */
    function soulbound() external view returns (bool);
}

// _
interface ISoulBoundMedal is ISoulBound {
    /**
     * @dev Add medals to current DAO
     * @param medalsname array of medal description
     * @param medalsuri array of medal uri
     */
    function addMedals(
        string[] calldata medalsname,
        string[] calldata medalsuri
    ) external;

    struct MedalPanel {
        uint256 _request;
        uint256 _approved;
        uint256 _rejected;
        uint256 _genesis;
    }

    /**
     * @dev get medals
     * @return array of medals
     */
    function getMedals()
        external
        view
        returns (
            string[] memory,
            string[] memory,
            MedalPanel[] memory
        );

    /**
     * @dev get medals count
     * @return uint256
     */
    function countMedals() external view returns (uint256);

    /**
     * @dev get medalIndex by tokenid
     */
    function getMedalIndexByTokenid(uint256 tokenid)
        external
        view
        returns (uint256);
 
    /**
     * @dev get cliam status by key
     * @param key key, bytes32 : request user address + medalIndex
     * @return uint256 the cliam status,  1:pending,2:rejected ,>2 tokenid
     */
    function getCliamStatusByBytes32Key(bytes32 key)
        external
        view
        returns (uint256);

    function getCliamRequestSize() external view returns (uint256);

    struct CliamRequest {
        address _address; // request address
        uint256 _medalIndex; // medal index
        uint256 _timestamp; // timestamp
        uint256 _status; // status of the cliam,  1:pending,2:rejected ,>2 tokenid
    }

    function getCliamRequest(uint256 _index)
        external
        view
        returns (CliamRequest memory);

    /**
     * @dev get Cliam Request Approved count
     * @param _medalIndex medal index
     * @return uint256
     */
    function countCliamRequestApproved(uint256 _medalIndex)
        external
        view
        returns (uint256);

    /**
     * @dev get Cliam Request Approved index by medal index
     * @param _medalIndex medal index
     * @return uint256[] CliamRequest index arrary of Cliam Request Approved
     */
    function listCliamRequestApproved(uint256 _medalIndex)
        external
        view
        returns (uint256[] memory);

    /**
     * @dev update medal by index
     * @param medalIndex index of medal
     * @param name new name of medal
     * @param uri new uri of medal
     */
    function updateMedal(
        uint256 medalIndex,
        string calldata name,
        string calldata uri
    ) external;

    /**
     * @dev  Approved cliam
     * @param cliamId the index of the cliam id
     * Emits a {Transfer} event.
     */
    function cliamApproved(uint256 cliamId) external;

    /**
     * @dev  Rejected cliam
     * @param cliamId the index of the cliam id
     */
    function cliamRejected(uint256 cliamId) external;

    /**
     * @dev Users apply for mint medal
     * @param medalIndex the index of the medal
     */
    function cliamRequest(uint256 medalIndex) external;
}

// _
interface IDataStorage {
    function saveString(bytes4 k, string calldata v) external;

    function getString(address a, bytes4 k)
        external
        view
        returns (string memory);

    function saveStrings(bytes4[] calldata k, string[] calldata v) external;

    function getStrings(address a, bytes4[] calldata k)
        external
        view
        returns (string[] memory);

    // function addToAddressArrary(bytes4 k, address v) external;

    // function removeFromAddressArrary(bytes4 k, address v) external;

    // function getAddressArrary(address a, bytes4 k)
    //     external
    //     view
    //     returns (address[] memory);

    // function getAddressArraryIndex(
    //     address a,
    //     bytes4 k,
    //     address addr
    // ) external view returns (uint256);
}

// _
interface ISoulBoundBridge {
    function onOwnerChage(address _dao) external;

    function register(address _dao) external;

    /**
    * @dev on user request a medal
    * @param _address address of user
    * @param _dao  address of dao
    * @param _medalIndex tokenid of medal
     */
    function onCliamRequest(
        address _address,
        address _dao,
        uint256 _medalIndex
    ) external;

}

// _
contract SoulBoundMedal is ERC721, Ownable, ISoulBoundMedal {
    using Counters for Counters.Counter;
    Counters.Counter private _tokenIdCounter;
    address public _daoBridge;
    string _baseUri = "";
    string[] private _medalnameArr;
    string[] private _medaluriArr;

    // Mapping from token ID to medal
    mapping(uint256 => uint256) private _medalMap;

    /**
     *  bytes32 :   address + medalIndex
     *  uint8 :   status of the cliam,  1:pending,2:rejected ,>2 tokenid
     */
    mapping(bytes32 => uint256) private _cliamStatus;

    ISoulBoundMedal.CliamRequest[] private _cliamRequestList;

    mapping(uint256 => uint256[]) private _cliamRequestListApprovedIndex; // key:medalIndex, value:index in _cliamRequestList

    ISoulBoundMedal.MedalPanel[] private _medalPanel;

    constructor(
        string memory _name, // NFT Collection Name
        string memory _symbol, // NFT Collection Symbol
        string[] memory _medalname, // Medal Name Arrary , length must be equal to _medaluri
        string[] memory _medaluri, // Medal Image Url Arrary , length must be equal to _medalname
        address _daoBridgeAddress // DAO Bridge Address, used to get cliam status
    ) ERC721(_name, _symbol) {
        _medalnameArr = _medalname;
        _medaluriArr = _medaluri;
        _daoBridge = _daoBridgeAddress;
        for (uint256 i = 0; i < _medalnameArr.length; i++) {
            _medalPanel.push(MedalPanel(0, 0, 0, block.timestamp));
        }
        _tokenIdCounter.set(9);
    }

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

    function setBaseURI(string memory baseUri) public onlyOwner {
        _baseUri = baseUri;
    }

    /**
     * @dev if the token is soulbound
     * @return true if the token is soulbound
     */
    function soulbound() public pure override returns (bool) {
        return true;
    }

    function setDAOBridge(address _daoBridgeAddress) public onlyOwner {
        _daoBridge = _daoBridgeAddress;
    }

    modifier DataStorageCheck() {
        require(_daoBridge != address(0), "dataStorage is not set");
        _;
    }

    function transferOwnership(address newOwner) public override onlyOwner {
        super.transferOwnership(newOwner);

        ISoulBoundBridge soulBoundBridge = ISoulBoundBridge(_daoBridge);
        try soulBoundBridge.onOwnerChage(address(this)) {} catch {}
    }

    /**
     * @dev save string to storage
     * @param k key
     * @param v value
     */
    function saveString(bytes4 k, string calldata v)
        public
        onlyOwner
        DataStorageCheck
    {
        IDataStorage dataStorageInstance = IDataStorage(_daoBridge);
        dataStorageInstance.saveString(k, v);
    }

    /**
     * @dev save multiple string to storage
     * @param k key arrary
     * @param v value arrary
     */
    function saveStrings(bytes4[] calldata k, string[] calldata v)
        public
        onlyOwner
        DataStorageCheck
    {
        IDataStorage dataStorageInstance = IDataStorage(_daoBridge);
        return dataStorageInstance.saveStrings(k, v);
    }

    /**
     * @dev Add medals to current DAO
     * @param medalsname array of medal name
     * @param medalsuri array of medal image url
     */
    function addMedals(
        string[] calldata medalsname,
        string[] calldata medalsuri
    ) public override onlyOwner {
        require(medalsname.length > 0 && medalsname.length == medalsuri.length);
        for (uint256 i = 0; i < medalsname.length; i++) {
            _medalnameArr.push(medalsname[i]);
            _medaluriArr.push(medalsuri[i]);
            _medalPanel.push(MedalPanel(0, 0, 0, block.timestamp));
        }
    }

    /**
     * @dev get medals count
     * @return uint256 the count of medals
     */
    function countMedals() public view override returns (uint256) {
        return _medalnameArr.length;
    }

    /**
     * @dev get medals
     * @return array of medals
     */
    function getMedals()
        public
        view
        override
        returns (
            string[] memory,
            string[] memory,
            ISoulBoundMedal.MedalPanel[] memory
        )
    {
        return (_medalnameArr, _medaluriArr, _medalPanel);
    }

    /**
     * @dev get medalIndex by tokenid
     * @param tokenid token id
     * @return uint256 the medal index
     */
    function getMedalIndexByTokenid(uint256 tokenid)
        public
        view
        override
        returns (uint256)
    {
        return _medalMap[tokenid];
    }

    /**
     * @dev get cliam status by key
     * @param key key, bytes32 : request user address + medalIndex
     * @return uint256 the cliam status,  1:pending,2:rejected ,>2 tokenid
     */
    function getCliamStatusByBytes32Key(bytes32 key)
        public
        view
        override
        returns (uint256)
    {
        return _cliamStatus[key];
    }

    /**
     * @dev get size of cliam request list
     * @return uint256 the size of cliam request list
     */
    function getCliamRequestSize() public view override returns (uint256) {
        return _cliamRequestList.length;
    }

    /**
     * @dev get cliam request item by index
     * @return ISoulBoundMedal.CliamRequest
     */
    function getCliamRequest(uint256 _index)
        public
        view
        override
        returns (ISoulBoundMedal.CliamRequest memory)
    {
        require(_index < _cliamRequestList.length);
        return _cliamRequestList[_index];
    }

    /**
     * @dev get the size of cliam request approved list by medal index
     * @param _medalIndex medal index
     * @return uint256 the size of cliam request approved list
     */
    function countCliamRequestApproved(uint256 _medalIndex)
        public
        view
        override
        returns (uint256)
    {
        return _cliamRequestListApprovedIndex[_medalIndex].length;
    }

    /**
     * @dev get Approved CliamRequest list index arrary by medal index
     * @param _medalIndex medal index
     * @return uint256[] CliamRequest index arrary of Cliam Request Approved
     */
    function listCliamRequestApproved(uint256 _medalIndex)
        public
        view
        override
        returns (uint256[] memory)
    {
        return _cliamRequestListApprovedIndex[_medalIndex];
    }

    /**
     * @dev update medal by medal index
     * @param medalIndex index of medal
     * @param name new name of medal
     * @param uri new image url of medal
     */
    function updateMedal(
        uint256 medalIndex,
        string calldata name,
        string calldata uri
    ) public override onlyOwner {
        require(medalIndex < _medalnameArr.length);
        _medalnameArr[medalIndex] = name;
        _medaluriArr[medalIndex] = uri;
    }

    /**
     * @dev  Approved cliam
     * @param cliamId the index of the cliam request id
     * Emits a {Transfer} event.
     */
    function cliamApproved(uint256 cliamId) public override onlyOwner {
        require(cliamId < _cliamRequestList.length);
        ISoulBoundMedal.CliamRequest memory request = _cliamRequestList[
            cliamId
        ];
        require(request._status == 1, "cliam request is not pending");//1:pending,2:rejected ,>2 tokenid
        bytes32 k = keccak256(
            abi.encodePacked(request._address, request._medalIndex)
        );
        uint256 cliamStatus = _cliamStatus[k]; //1:pending,2:rejected ,>2 tokenid
        require(
            cliamStatus < 3,
            "cliam request of the medal index is already approved before"
        );
        _cliamRequestListApprovedIndex[request._medalIndex].push(cliamId);
        unchecked {
            _medalPanel[request._medalIndex]._approved++;
            _medalPanel[request._medalIndex]._request--;
        }
        _tokenIdCounter.increment();
        uint256 tokenId = _tokenIdCounter.current();
        _medalMap[tokenId] = request._medalIndex;

        _cliamStatus[k] = tokenId;
        _cliamRequestList[cliamId]._status = tokenId; //1:pending,2:rejected ,>2 tokenid

        _mint(request._address, tokenId);
    }

    /**
     * @dev  Rejected cliam
     * @param cliamId the index of the cliam request id
     */
    function cliamRejected(uint256 cliamId) public override onlyOwner {
        require(cliamId < _cliamRequestList.length);
        ISoulBoundMedal.CliamRequest memory request = _cliamRequestList[
            cliamId
        ];
        require(request._status == 1, "cliam request is not pending"); //1:pending,2:rejected ,>2 tokenid
        bytes32 k = keccak256(
            abi.encodePacked(request._address, request._medalIndex)
        );
        uint256 cliamStatus = _cliamStatus[k]; //1:pending,2:rejected ,>2 tokenid
        _cliamRequestList[cliamId]._status = 2;
        if (cliamStatus < 3) {
            _cliamStatus[k] = 2;
        }
        unchecked {
            _medalPanel[request._medalIndex]._rejected++;
            _medalPanel[request._medalIndex]._request--;
        }
    }

    /**
     * @dev Users apply for mint medal
     * @param medalIndex the index of the medal
     */
    function cliamRequest(uint256 medalIndex) public override {
        require(medalIndex < _medalnameArr.length);
        require(msg.sender.code.length == 0, "contract address not supported");
        bytes32 k = keccak256(abi.encodePacked(msg.sender, medalIndex));

        require(_cliamStatus[k] < 3, "already approved");///1:pending,2:rejected ,>2 tokenid

        _cliamStatus[k] = 1;
        _cliamRequestList.push(
            ISoulBoundMedal.CliamRequest(
                msg.sender,
                medalIndex,
                block.timestamp,
                1
            )
        );

        unchecked {
            _medalPanel[medalIndex]._request++;
        }
        ISoulBoundBridge soulBoundBridge = ISoulBoundBridge(_daoBridge);
        soulBoundBridge.onCliamRequest(msg.sender, address(this), medalIndex);
    }

    /**
     * @dev  RFC 3986 compliant URL:base64://{json encoded with base64} ,json {"name":"base64(medal name)","image":"base64(medal uri)"}
     * @param tokenId  tokenid
     * @return string  the base64 uri of the Token
     */
    function tokenURI(uint256 tokenId)
        public
        view
        override(ERC721)
        returns (string memory)
    {
        require(
            _exists(tokenId),
            "ERC721Metadata: URI query for nonexistent token"
        );
        string memory baseURI = _baseURI();
        string memory medalName = _medalnameArr[_medalMap[tokenId]];
        string memory medalURI = string(
            abi.encodePacked(baseURI, _medaluriArr[_medalMap[tokenId]])
        );
        string memory json = string(
            abi.encodePacked(
                "base64://",
                Base64.encode(
                    abi.encodePacked(
                        '{"owner":"',
                        Strings.toHexString(uint256(uint160(ownerOf(tokenId)))),
                        '","name":"',
                        Base64.encode(bytes(medalName)),
                        '","image":"',
                        Base64.encode(bytes(medalURI)),
                        '"}'
                    )
                )
            )
        );
        return json;
    }

    function supportsInterface(bytes4 interfaceId)
        public
        view
        override(ERC721, IERC165)
        returns (bool)
    {
        return
            interfaceId == type(ISoulBound).interfaceId ||
            interfaceId == type(ISoulBoundMedal).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    modifier SoulBoundToken() {
        require(soulbound() == false, "SoulBound token cannot be transferred.");
        _;
    }

    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public override(IERC721, ERC721) SoulBoundToken {}

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public override(IERC721, ERC721) SoulBoundToken {}

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public override(IERC721, ERC721) SoulBoundToken {}
}