Contract Address Details

// Sources flattened with hardhat v2.10.1 https://hardhat.org

// File openzeppelin-contracts-upgradeable/utils/introspection/IERC165Upgradeable.sol

// OpenZeppelin Contracts v4.4.0 (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 IERC165Upgradeable {
    /**
     * @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);
}


// File openzeppelin-contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol

// OpenZeppelin Contracts v4.4.0 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721Upgradeable is IERC165Upgradeable {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

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

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

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

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

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

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

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

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

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

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

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


// File openzeppelin-contracts-upgradeable/token/ERC721/IERC721ReceiverUpgradeable.sol

// OpenZeppelin Contracts v4.4.0 (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 IERC721ReceiverUpgradeable {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}


// File openzeppelin-contracts-upgradeable/token/ERC721/extensions/IERC721MetadataUpgradeable.sol

// OpenZeppelin Contracts v4.4.0 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721MetadataUpgradeable is IERC721Upgradeable {
    /**
     * @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);
}


// File openzeppelin-contracts-upgradeable/utils/AddressUpgradeable.sol

// OpenZeppelin Contracts v4.4.0 (utils/Address.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

    /**
     * @dev 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);
            }
        }
    }
}


// File openzeppelin-contracts-upgradeable/proxy/utils/Initializable.sol

// OpenZeppelin Contracts v4.4.0 (proxy/utils/Initializable.sol)

pragma solidity ^0.8.0;

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To initialize the implementation contract, you can either invoke the
 * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() initializer {}
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        require(_initializing || !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }
}


// File openzeppelin-contracts-upgradeable/utils/ContextUpgradeable.sol

// OpenZeppelin Contracts v4.4.0 (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 ContextUpgradeable is Initializable {
    function __Context_init() internal initializer {
        __Context_init_unchained();
    }

    function __Context_init_unchained() internal initializer {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
    uint256[50] private __gap;
}


// File openzeppelin-contracts-upgradeable/utils/StringsUpgradeable.sol

// OpenZeppelin Contracts v4.4.0 (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library StringsUpgradeable {
    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);
    }
}


// File openzeppelin-contracts-upgradeable/utils/introspection/ERC165Upgradeable.sol

// OpenZeppelin Contracts v4.4.0 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;


/**
 * @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 ERC165Upgradeable is Initializable, IERC165Upgradeable {
    function __ERC165_init() internal initializer {
        __ERC165_init_unchained();
    }

    function __ERC165_init_unchained() internal initializer {
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165Upgradeable).interfaceId;
    }
    uint256[50] private __gap;
}


// File openzeppelin-contracts-upgradeable/token/ERC721/ERC721Upgradeable.sol

// OpenZeppelin Contracts v4.4.0 (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;








/**
 * @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 ERC721Upgradeable is Initializable, ContextUpgradeable, ERC165Upgradeable, IERC721Upgradeable, IERC721MetadataUpgradeable {
    using AddressUpgradeable for address;
    using StringsUpgradeable 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.
     */
    function __ERC721_init(string memory name_, string memory symbol_) internal initializer {
        __Context_init_unchained();
        __ERC165_init_unchained();
        __ERC721_init_unchained(name_, symbol_);
    }

    function __ERC721_init_unchained(string memory name_, string memory symbol_) internal initializer {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165Upgradeable, IERC165Upgradeable) returns (bool) {
        return
            interfaceId == type(IERC721Upgradeable).interfaceId ||
            interfaceId == type(IERC721MetadataUpgradeable).interfaceId ||
            super.supportsInterface(interfaceId);
    }

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

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

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

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

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

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

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

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721Upgradeable.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 = ERC721Upgradeable.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

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

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

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

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

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

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

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721Upgradeable.ownerOf(tokenId);

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

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

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

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

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721Upgradeable.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

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

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

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721Upgradeable.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 IERC721ReceiverUpgradeable(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721ReceiverUpgradeable.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 {}
    uint256[44] private __gap;
}


// File openzeppelin-contracts-upgradeable/access/OwnableUpgradeable.sol

// OpenZeppelin Contracts v4.4.0 (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @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 OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal initializer {
        __Context_init_unchained();
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal initializer {
        _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);
    }
    uint256[49] private __gap;
}


// File openzeppelin-contracts-upgradeable/token/ERC721/extensions/IERC721EnumerableUpgradeable.sol

// OpenZeppelin Contracts v4.4.0 (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721EnumerableUpgradeable is IERC721Upgradeable {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

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

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


// File openzeppelin-contracts-upgradeable/token/ERC721/extensions/ERC721EnumerableUpgradeable.sol

// OpenZeppelin Contracts v4.4.0 (token/ERC721/extensions/ERC721Enumerable.sol)

pragma solidity ^0.8.0;



/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721EnumerableUpgradeable is Initializable, ERC721Upgradeable, IERC721EnumerableUpgradeable {
    function __ERC721Enumerable_init() internal initializer {
        __Context_init_unchained();
        __ERC165_init_unchained();
        __ERC721Enumerable_init_unchained();
    }

    function __ERC721Enumerable_init_unchained() internal initializer {
    }
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

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

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

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

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165Upgradeable, ERC721Upgradeable) returns (bool) {
        return interfaceId == type(IERC721EnumerableUpgradeable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Upgradeable.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

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

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721EnumerableUpgradeable.totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }

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

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

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721Upgradeable.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }

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

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

        uint256 lastTokenIndex = ERC721Upgradeable.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

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

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

        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }

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

        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];

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

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

        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
    uint256[46] private __gap;
}


// File openzeppelin-contracts-upgradeable/access/IAccessControlUpgradeable.sol

// OpenZeppelin Contracts v4.4.0 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControlUpgradeable {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}


// File openzeppelin-contracts-upgradeable/access/AccessControlUpgradeable.sol

// OpenZeppelin Contracts v4.4.0 (access/AccessControl.sol)

pragma solidity ^0.8.0;





/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControlUpgradeable is Initializable, ContextUpgradeable, IAccessControlUpgradeable, ERC165Upgradeable {
    function __AccessControl_init() internal initializer {
        __Context_init_unchained();
        __ERC165_init_unchained();
        __AccessControl_init_unchained();
    }

    function __AccessControl_init_unchained() internal initializer {
    }
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role, _msgSender());
        _;
    }

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

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        StringsUpgradeable.toHexString(uint160(account), 20),
                        " is missing role ",
                        StringsUpgradeable.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
    uint256[49] private __gap;
}


// File openzeppelin-contracts-upgradeable/security/PausableUpgradeable.sol

// OpenZeppelin Contracts v4.4.0 (security/Pausable.sol)

pragma solidity ^0.8.0;


/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract PausableUpgradeable is Initializable, ContextUpgradeable {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    function __Pausable_init() internal initializer {
        __Context_init_unchained();
        __Pausable_init_unchained();
    }

    function __Pausable_init_unchained() internal initializer {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
    uint256[49] private __gap;
}


// File contracts/PlatformSettings.sol

pragma solidity ^0.8.0;



/// @title A platform settings for OTG contracts
/// @notice Admin can use this contract for granting and revoking roles, pause and unpause platform, set new wallets for fee receiving
/// @dev This contract inherits 'Initializable', 'AccessControlUpgradeable', 'PausableUpgradeable' contracts form openzeppelin library
contract PlatformSettings is Initializable, AccessControlUpgradeable, PausableUpgradeable{
    bytes32 public constant SECONDARY_ADMIN_ROLE = keccak256("SECONDARY_ADMIN_ROLE");
    bytes32 public constant BACKEND_ROLE = keccak256("BACKEND_ROLE");
    uint256 public constant gunDecimals = 10**18;
    uint256 public constant PERCENT_DENOMINATOR = 100;

    // address of main admin
    address public initialAdmin;
    // address of financial wallet (withdraws GUNs from contract)
    address payable public financialWallet;

    // percentage that represents validator fee during decoding process
    uint256 public validatorFeePercentageForDecoding;
    // percentage that represents platform fee during decoding process
    uint256 public platformFeePercentageForDecoding;


    bytes32 public constant BRIDGE_ROLE = keccak256("BRIDGE_ROLE");

    /// @notice this event is emitted when new financial wallet is set
    /// @param newWallet address of new financial wallet
    event newFinancialWallet(
        address indexed newWallet
    );


    error InvalidRole(address caller, bytes32 role);

    error IncorrectFeeDistribution();


    error AlreadyHasRole(address account, bytes32 role);


    error AlreadyHasNotRole(address account, bytes32 role);


    /// @notice A disposable function for initializing contract
    /// @param _admin address of initial admin of contract
    /// @dev Grants caller with admin role
    /// @dev Also calls initializers of AccessControl and Pausable contracts.
    /// @dev Sets caller as an initialAdmin and financeWallet(wallet for receiving fees and royalties)
    /// @dev Sets initial fee percentage for decoding process
    function initialize(
        address _admin
    )public initializer{
        __AccessControl_init();
        __Pausable_init_unchained();
        _setupRole(DEFAULT_ADMIN_ROLE, _admin);
        initialAdmin = _admin;
        financialWallet = payable(msg.sender);
        validatorFeePercentageForDecoding = 50;
        platformFeePercentageForDecoding = 50;
    }
// *********************** MODIFIERS *********************************************
    /// @notice verifies if message sender is an admin or secondary admin
    modifier onlyAdmin{
        if(!(hasRole(DEFAULT_ADMIN_ROLE, msg.sender) || hasRole(SECONDARY_ADMIN_ROLE,msg.sender))){
            revert InvalidRole(msg.sender, SECONDARY_ADMIN_ROLE);
        }
        _;
    }

    // *********************** VIEW FUNCTIONS *********************************************
    /// TODO restrict function visibility from view to pure
    function version() public pure returns (uint32){
        //version in format aaa.bbb.ccc => aaa*1E6+bbb*1E3+ccc;
        return uint32(1000001);
    }

// *********************** FUNCTIONS *********************************************
    /// @notice checks account for admin roles
    function isAdmin(address account) public view returns(bool){
        return (hasRole(DEFAULT_ADMIN_ROLE, account)||hasRole(SECONDARY_ADMIN_ROLE, account));
    }

    /// @notice checks account for backend role
    function isBackendRole(address account) public view returns(bool){
        return hasRole(BACKEND_ROLE, account);
    }

    function isBridgeRole(address account) public view returns(bool){
        return hasRole(BRIDGE_ROLE, account);
    }

    /// @notice checks account for admin roles or if platform is not paused
    function isAdminOrNotPaused(address caller) public view returns(bool){
        return(!paused()||hasRole(DEFAULT_ADMIN_ROLE,caller)||hasRole(SECONDARY_ADMIN_ROLE,caller));
    }

    /// TODO check if this function must exist
    /// @notice returns a number, that represents amount of fee, which validator will receive after decoding process
    function getValidatorFeeForDecoding(uint256 _price)public view returns(uint256){
        if((platformFeePercentageForDecoding + validatorFeePercentageForDecoding)!=100){
            revert IncorrectFeeDistribution();
        }
        return (_price* gunDecimals * validatorFeePercentageForDecoding)/PERCENT_DENOMINATOR;
    }

    /// TODO check if this function must exist
    /// @notice returns a number, that represents amount of fee, which financialWallet will receive after decoding process
    function getPlatformFeeForDecoding(uint256 _price)public view returns(uint256){
        if((platformFeePercentageForDecoding + validatorFeePercentageForDecoding)!=100){
            revert IncorrectFeeDistribution();
        }
        return (_price* gunDecimals * platformFeePercentageForDecoding)/PERCENT_DENOMINATOR;
    }
    /// @notice suspends most functions in contracts
    /// @dev Caller must be admin
    function pause() public onlyAdmin{
        _pause();
    }

    /// @notice restores most functions in contracts
    /// @dev Caller must be admin
    function unpause() public onlyAdmin{
        _unpause();
    }

    /// @notice sets new address as a payable financialWallet
    /// @dev caller must be admin, emits 'newFinancialWallet' 
    function setNewFinancialWallet(address _newWalletAddress) public onlyAdmin{
        financialWallet = payable(_newWalletAddress);
        emit newFinancialWallet(_newWalletAddress);
    }

    /// @notice granting secondary admin role to a specific address
    /// @param account address of a specific account 
    function grantSecondaryAdminRole(address account) public onlyRole(DEFAULT_ADMIN_ROLE){
        if(hasRole(SECONDARY_ADMIN_ROLE, account)){
            revert AlreadyHasRole(account, SECONDARY_ADMIN_ROLE); 
        }
        grantRole(SECONDARY_ADMIN_ROLE, account);
    }

    /// @notice revoking secondary admin role from a specific address
    /// @param account address of a specific account
    function revokeSecondaryAdminRole(address account) public onlyRole(DEFAULT_ADMIN_ROLE){
        if(!hasRole(SECONDARY_ADMIN_ROLE, account)){
            revert AlreadyHasNotRole(account, SECONDARY_ADMIN_ROLE); 
        }
        revokeRole(SECONDARY_ADMIN_ROLE, account);
    }

    /// @notice granting backend admin role from a specific address
    /// @param account address of a specific account 
    function grantBackendRole(address account) public onlyRole(DEFAULT_ADMIN_ROLE){
        if(hasRole(BACKEND_ROLE, account)){
            revert AlreadyHasRole(account, BACKEND_ROLE); 
        }
        grantRole(BACKEND_ROLE, account);
    }

    /// @notice revoking backend admin role from a specific address
    /// @param account address of a specific account 
    function revokeBackendRole(address account) public onlyRole(DEFAULT_ADMIN_ROLE){
        if(!hasRole(BACKEND_ROLE, account)){
            revert AlreadyHasNotRole(account, BACKEND_ROLE); 
        }
        revokeRole(BACKEND_ROLE, account);
    }

    function grantBridgeRole(address account) public onlyRole(DEFAULT_ADMIN_ROLE){
        if(hasRole(BRIDGE_ROLE, account)){
            revert AlreadyHasRole(account, BRIDGE_ROLE); 
        }
        grantRole(BRIDGE_ROLE, account);
    }

    function revokeBridgeRole(address account) public onlyRole(DEFAULT_ADMIN_ROLE){
        if(!hasRole(BRIDGE_ROLE, account)){
            revert AlreadyHasNotRole(account, BRIDGE_ROLE); 
        }
        revokeRole(BRIDGE_ROLE, account);
    }

    /// TODO maybe it will be better, to set validatorFeePercentageForDecoding and platformFeePercentageForDecoding with one function
    /// @notice Sets a number, that represents amount of fee, which validator will receive after 
    /// @dev caller must be admin
    function setValidatorFeePercentageForDecoding(uint256 _percentage) public onlyAdmin{
        validatorFeePercentageForDecoding = _percentage;
    }
    
    /// @notice Sets a number, that represents amount of fee, which financialWallet will receive after 
    /// @dev caller must be admin
    function setPlatformFeePercentageForDecoding(uint256 _percentage) public onlyAdmin{
        platformFeePercentageForDecoding = _percentage;
    }

    // TODO DEPRECATED, will be deleted sooner
    function getValidatorFeePercentageForDecoding() external view returns(uint256){
        return(validatorFeePercentageForDecoding);
    }

    // TODO DEPRECATED, will be deleted sooner
    function getPlatformFeePercentageForDecoding() external view returns(uint256){
        return(platformFeePercentageForDecoding);
    }
}


// File contracts/utils/ERC721BatchUpgradeable.sol

pragma solidity ^0.8.0;

contract ERC721BatchUpgradeable is ERC721EnumerableUpgradeable {
  
   
   function batchApprove(address to, uint256[] memory tokenIDs) public {
        for (uint256 i = 0; i < tokenIDs.length; ++i) {
            approve(to, tokenIDs[i]);
        }
    }
}


// File contracts/interfaces/IBattlePass.sol

pragma solidity ^0.8.0;

/// @notice Interface for BattlePassContract
interface IBattlePass{
    /// @notice this event is emitted when user activates BattlePass
    /// @param account owner of BatlePass
    /// @param tokenID token id of specific BattlePass
    event BattlePassActivated(address indexed account, uint256 indexed tokenID);
    /// @notice this event is emitted when user deactivates BattlePass
    /// @param account owner of BatlePass
    /// @param tokenID token id of specific BattlePass
    event BattlePassDeactivated(address indexed account, uint256 indexed tokenID);
    /// @notice this event is emitted when admin mints BattlePass
    /// @param to receiver of new BatlePass
    /// @param tokenID token id of BattlePass
    /// @param rarity rarity(0-4) of BattlePass
    event BattlePassMinted(address indexed to, uint256 indexed tokenID, uint8 rarity);
    /// @notice this event is emitted when admin creates season
    /// @param seasonID id of created season
    /// @param startDate unix time of season beginning
    /// @param duration duration of season in seconds
    event SeasonCreated(uint256 indexed seasonID, uint256 startDate, uint256 duration);
    /// @notice this event is emitted when admin starts current season
    /// @param seasonID id of current season
    event SeasonStarted(uint256 indexed seasonID);


    function version() external view returns (uint32);
    
    /// @notice gets current season id
    /// @return id of current season 
    function getCurrentSeason() external view returns(uint256);
    /// @notice gets mode(activated or deactivated) of specific BattlePass
    /// @param _tokenID token id of specific BattlePass
    /// @return bool mode of specific BattlePass
    function getMode(uint256 _tokenID) external view returns(bool);
    /// @notice gets rarity of specific BattlePass
    /// @param _tokenID token id of specific BattlePass
    /// @return uint8 rarity parameter of specific BattlePass
    function getRarity(uint256 _tokenID) external view returns(uint8);
    /// @notice gets start date(in seconds) of specific season
    /// @param _seasonID token id of specific season
    /// @return uint64 parameter, startDate of specific season
    function getSeasonStartDate(uint256 _seasonID) external view returns(uint64);
    /// @notice gets end date(in seconds) of specific season
    /// @param _seasonID token id of specific season
    /// @return uint64 parameter, endDate of specific season
    function getSeasonEndDate(uint256 _seasonID) external view returns(uint64);
    /// @notice gets duration(in seconds) of specific season
    /// @param _seasonID token id of specific season
    /// @return uint64 parameter, duration of specific season
    function getSeasonDuration(uint256 _seasonID) external view returns(uint64);
}


// File contracts/interfaces/IDataCube.sol

pragma solidity ^0.8.0;

/// @notice Interface for DataCubeContract
interface IDataCube {
    /// @notice this event is emitted when admin mints NFT DataCube
    /// @param to receiver of new DataCube
    /// @param tokenID id of new DataCube
    /// @param quality quality of new DataCube
    /// @param season BattlePass season of new DataCube
    event DataCubeMinted(
        address indexed to,
        uint256 indexed tokenID,
        uint8 quality,
        uint256 season);
    /// @notice this event is emitted when DataCube is burnt
    /// @param DCTokenID id of NFT DataCube
    /// @param DCBackendTokenID if of backend nonNFT DataCube
    event DataCubeBurnt(
        uint256 indexed DCTokenID,
        uint256 DCBackendTokenID);

    /// Deprecated, will be deleted sooner
    event DataCubeMintable(
        bool indexed
    );

    function version() external view returns (uint32);

    /// @notice during decoding, ValidatorLicenseContract calls this function to open DataCube and mint GameItem
    /// @dev data cube will be burned. Emits "Burnt" event. Calls "mintFromCube" function from GameItemContract via IGameItem interface
    /// @param _DCTokenID token id of specific DataCube
    /// @param _VLTokenID token id of specific Validator License
    /// @param _seasonID token id of season
    /// @param _DCQuality DataCube quality
    /// @param _receiver receiver's address of new item
    /// @param _DCBackendTokenID backend token id of specific DataCube
    /// @param _data metadata URL 
    function open(
        uint256 _DCTokenID,
        uint256 _VLTokenID,
        uint256 _seasonID,
        uint8 _DCQuality,
        address _receiver,
        uint256 _DCBackendTokenID,
        string memory _data) external;
    /// @notice gets season of specific DataCube
    /// @return uint256 id of specific DataCube 
    function getCubeSeason(uint256 _tokenID) external view returns(uint256);
    /// @notice gets lever of minting for DataCubes
    /// @return bool parameter, lever is on or not
    function getLeverMintable() external view returns(bool);
    /// @notice gets quality of specific DataCube
    /// @return uint8 quality parameter of specific DataCube 
    function getCubeQuality(uint256 _tokenID) external view  returns(uint8);
    /// @notice gets initial owner of specific DataCube
    /// @return address of initial owner of specific DataCube 
    function getCubeInitialOwner(uint256 _tokenID) external view  returns(address);

    function getFeeDepensOnQuality(uint8 _quality) external view  returns(uint256);
    /// @notice changes state of minting lever for dataCubes
    function changeLeverMintable() external;
    
    function burn(uint256 _tokenID) external;


}


// File contracts/interfaces/IGameItem.sol

pragma solidity ^0.8.0;

/// @notice Interface for GameItemContract
interface IGameItem {
    /// @notice this event is emitted when NFT GameItem is minted
    /// @param to new owner of GameItem
    /// @param tokenID id ow new GameItem
    /// @param quality quality(0-4) of new GameItem
    /// @param seasonID BattlePass season of new GameItem
    /// @param hacker the hacker who minted this item
    event Minted(
        address indexed to,
        uint256 indexed tokenID,
        uint8 quality,
        uint256 seasonID,
        address hacker);

    event MintedForUser(
        address indexed to,
        uint256 indexed tokenID,
        uint8 quality,
        uint256 financialWalletPayment,
        uint256 seasonID,
        address hacker);

    function version() external view returns (uint32);


    /// @notice gets creator's address of specific GameItem
    /// @param _tokenID token id of specific GameItem
    /// @return minter's address 
    function getItemCreator(uint256 _tokenID) external view returns(address);
    /// @notice gets (hacker) address of specific GameItem
    /// @param _tokenID token id of specific GameItem
    /// @return hacker's address 
    function getItemHacker(uint256 _tokenID) external view returns(address);
    /// @notice gets validator's(hacker) address of specific GameItem
    /// @param _tokenID token id of specific GameItem
    /// @return validator's address 
    function getItemValidator(uint256 _tokenID) external view returns(uint256);
    /// @notice gets quality of specific GameItem
    /// @param _tokenID token id of specific GameItem
    /// @return uint8 parameter. quality of GameItem 
    function getItemQuality(uint256 _tokenID) external view returns(uint8);
    /// @notice gets season of specific GameItem
    /// @param _tokenID token id of specific GameItem
    /// @return uint256 parameter. season id
    function getItemSeason(uint256 _tokenID) external view returns(uint256);
    /// @notice gets market state of specific GameItem
    /// @param _tokenID token id of specific GameItem
    /// @return uint8 parameter. Market state of GameItem 
    function getItemState(uint256 _tokenID) external view returns(uint8);
    /// @notice changes market state of specific GameItem
    /// @param _tokenID token id of specific GameItem
    /// @param _state (0-2) new item state
    function changeItemState(uint256 _tokenID, uint8 _state) external;

    /// @notice mints new GameItem
    /// @dev can be called only via DataCubeContract or ValidatorLicenseContract
    /// @dev emits "Minted" event
    /// @param _receiver receiver's address of new GameItem
    /// @param _VLTokenID token id of specific ValidatorLicense
    /// @param _seasonID token id of season
    /// @param _DCQuality quality of new GameItem
    /// @param _metadataURL URL to metadata storage
    function mintFromCube(
        address _receiver, 
        uint256 _VLTokenID, 
        uint256 _seasonID, 
        uint8 _DCQuality, 
        string memory _metadataURL) external;

    /// @notice mints new GameItem
    /// @dev can be called by user, with signature
    /// @dev sends GUNs to this contract address
    /// @param _VLTokenID token id of specific ValidatorLicense
    /// @param _seasonID token id of season
    /// @param _quality quality of new GameItem
    /// @param _price price(in GUNs) od DataCube decoding
    /// @param _metadataURL URL to metadata storage
    /// @param _deadline date of expiring signature(in unix time)
    /// @param _signature signature of signed data by backender
    function mintForUser(
        uint256 _VLTokenID,
        uint256 _seasonID,
        uint8 _quality,
        uint256 _price,
        string memory _metadataURL,
        uint256 _deadline,
        bytes memory _signature) payable external;

    function burn(uint256 _tokenID) external;

    function bridgeBurn(uint256 _tokenID) external;
    
    function bridgeMint(address to, uint256 _tokenID) external;
}


// File contracts/DataCubeContract.sol

pragma solidity ^0.8.0;








/// @title Contract for data cube management
/// @notice User can use this contract for reading info about DataCube
/// @dev This contract inherits 'ERC721EnumerableUpgradeable', contracts form openzeppelin library and IDataCube interface
/// @notice Abbreviation: DC - DataCube
contract DataCubeContract is ERC721BatchUpgradeable, IDataCube{
    // last minted token id of DataCube
    uint256 public lastMintedTokenID;
    // address of decoder contract address
    address public decoderAddress;
    // address of BattlePassContract
    address public battlePassContractAddress;
    // address of GameItemContract
    address public gameItemContractAddress;
    // address of PlatformSettings contract
    address public platformSettingsContractAddress;
    // lever to Mint DataCube or not; deprecated, will be deleted sooner
    bool private dataCubeMintable; 
    // storage for DataCube tokens
    mapping(uint256 => DataCube) public dataCubes;

    // Fee for decoding hex from License Storage
    mapping(Quality => uint256) public feeForDecodingHex;


    /// enumeration for ValidatorLicense quality
    enum Quality{
        Standard,
        Professional,
        Elite,
        Overclocked,
        Hacked
    }

    /// structure of DataCube token
    /// quality - quality of cube(Hex), season - season of cube

    struct DataCube{
        Quality quality;
        uint256 season;
        address initialOwner;
    }

    error ContractsIsPaused();

    error ContractsIsNotPaused();

    error InvalidRole(address caller, bytes32 role);

    error CallerNotDecoder(address caller);

    error IncorrectQuality(uint8 quality);


    /// @notice A disposable function for initializing contract
    /// @param _battlePassContractAddress address of BattlePassContract
    /// @param _platformSettingsContractAddress address of PlatformSettings contract
    /// @dev calls initializer from ERC721Upgradeable contract
    function initialize(
        address _battlePassContractAddress,
        address _platformSettingsContractAddress,
        uint256 _feeForStandartHex,
        uint256 _feeForProfessionalHex,
        uint256 _feeForEliteHex,
        uint256 _feeForOverclockedHex,
        uint256 _feeForHackedHex
    ) public initializer{
        __ERC721_init("DataCube", "DC");
        battlePassContractAddress = _battlePassContractAddress;
        platformSettingsContractAddress = _platformSettingsContractAddress;
        dataCubeMintable = true;
        feeForDecodingHex[Quality.Standard] = _feeForStandartHex;
        feeForDecodingHex[Quality.Professional] = _feeForProfessionalHex;
        feeForDecodingHex[Quality.Elite] = _feeForEliteHex;
        feeForDecodingHex[Quality.Overclocked] = _feeForOverclockedHex;
        feeForDecodingHex[Quality.Hacked] = _feeForHackedHex;
    }
// *********************** MODIFIERS *********************************************
    /// @notice verifies if switch "_paused" in PlatformSettings contract is on
    modifier whenPaused{
        if(!PlatformSettings(platformSettingsContractAddress).paused()){
            revert ContractsIsNotPaused();
        }
        _;
    }

    /// @notice verifies if switch "_paused" in PlatformSettings contract is off
    modifier whenNotPaused{
        if(PlatformSettings(platformSettingsContractAddress).paused()){
            revert ContractsIsPaused();
        }
        _;
    }

    /// @notice verifies if message sender is an admin or secondary admin
    modifier onlyAdmin{
        if(!(PlatformSettings(platformSettingsContractAddress).hasRole(PlatformSettings(platformSettingsContractAddress).DEFAULT_ADMIN_ROLE(),msg.sender)||PlatformSettings(platformSettingsContractAddress).hasRole(PlatformSettings(platformSettingsContractAddress).SECONDARY_ADMIN_ROLE(),msg.sender))){
            revert InvalidRole(msg.sender, PlatformSettings(platformSettingsContractAddress).SECONDARY_ADMIN_ROLE());
        }
        _;
    }

    modifier onlyDecoder{
        if(decoderAddress != msg.sender){
            revert CallerNotDecoder(msg.sender);
        }
        _;
    }

    modifier onlyAdminOrDecoder{
        if(decoderAddress != msg.sender && !(PlatformSettings(platformSettingsContractAddress).hasRole(PlatformSettings(platformSettingsContractAddress).DEFAULT_ADMIN_ROLE(),msg.sender)||PlatformSettings(platformSettingsContractAddress).hasRole(PlatformSettings(platformSettingsContractAddress).SECONDARY_ADMIN_ROLE(),msg.sender))){
            revert InvalidRole(msg.sender, PlatformSettings(platformSettingsContractAddress).SECONDARY_ADMIN_ROLE());
        }
        _;
    }
// *********************** VIEW FUNCTIONS *********************************************

    /// TODO restrict function visibility from view to pure
    function version() public override pure returns (uint32){
        //version in format aaa.bbb.ccc => aaa*1E6+bbb*1E3+ccc;
        return uint32(1000002);
    }
    
    /// @notice gets quality of specific DataCube
    /// @dev inherited from IDataCube interface
    /// @return uint8 quality parameter of specific DataCube 
    function getCubeQuality(uint256 _tokenID) public view override returns(uint8){
        return uint8(dataCubes[_tokenID].quality);
    }

    /// @notice gets season of specific DataCube
    /// @dev inherited from IDataCube interface
    /// @return uint256 id of specific season 
    function getCubeSeason(uint256 _tokenID) public view override returns(uint256){
        return dataCubes[_tokenID].season;
    }

    /// @notice gets season of specific DataCube
    /// @dev inherited from IDataCube interface
    /// @return address of DC's first owner  
    function getCubeInitialOwner(uint256 _tokenID) public view override returns(address){
        return dataCubes[_tokenID].initialOwner;
    }


    /// TODO Deprecated, will be deleted sooner. Or check docs
    /// @notice gets lever of minting for DataCubes
    /// @dev inherited from IDataCube interface
    /// @return bool parameter, lever is on or not
    function getLeverMintable() public view override returns(bool){
        return dataCubeMintable;
    }

    function getFeeDepensOnQuality(uint8 _quality) public view override returns(uint256){
        return feeForDecodingHex[Quality(_quality)];
    }


// *********************** ADMIN FUNCTIONS *********************************************
    /// @notice Admin sets new address for GameItemContract
    function setGameItemContractAddress(address _contractAddress) public onlyAdmin{
        gameItemContractAddress = _contractAddress;
    }

    /// @notice Admin sets new address for Decoder contract
    function setDecoderAddress(address _contractAddress) public onlyAdmin{
        decoderAddress = _contractAddress;
    }

    /// TODO may be deprecated, read docs
    /// @notice changes state of minting lever for dataCubes
    function changeLeverMintable() public override onlyAdmin{
        dataCubeMintable = !dataCubeMintable;
        emit DataCubeMintable(dataCubeMintable);
    }

    /// @notice Admin sets initial owner to DataCube
    /// @dev Admin during bulk transfer sets initial owner to DataCube
    /// @param _tokenID token id of specific DataCube
    /// @param _initialOwner first user, who obtained DataCube
    function setCubeInitialOwner(uint256 _tokenID, address _initialOwner) public onlyAdmin{
        dataCubes[_tokenID].initialOwner = _initialOwner;
    }

    function setFeeForDecodingHex(uint8 _quality, uint256 amount) public onlyAdmin{
        feeForDecodingHex[Quality(_quality)] = amount;
    }


    /// @notice admin mints DataCube
    /// @dev Emits "DataCubeMinted" event. Requirements: the season must be going on at the moment; rarity of DC must be acceptable(0-4); caller must be admin
    /// @dev if receiver(_to) is an admin, DC's parameter initialOwner will be skipped
    /// @dev calls _safeMint function from ERC721Upgradeable contract
    /// @param _to receiver address of DataCube
    /// @param _quality quality of new DataCube
    function mint(address _to, uint8 _quality) public onlyAdmin{
        if(!(_quality>=0 && _quality<=4)){
            revert IncorrectQuality(_quality);
        }
        uint256 _tokenID = ++lastMintedTokenID;
        _safeMint(_to, _tokenID);
        dataCubes[_tokenID].quality = Quality(_quality);
        if ((!PlatformSettings(platformSettingsContractAddress).hasRole(PlatformSettings(platformSettingsContractAddress).DEFAULT_ADMIN_ROLE(),_to))||(!PlatformSettings(platformSettingsContractAddress).hasRole(PlatformSettings(platformSettingsContractAddress).SECONDARY_ADMIN_ROLE(),_to))){
            dataCubes[_tokenID].initialOwner = _to;}


        emit DataCubeMinted(_to, _tokenID, _quality, 0);
    }

// *********************** FUNCTIONS *********************************************
    /// @notice during decoding, Decoder calls this function to open DataCube and mint GameItem
    /// @dev data cube will be burned. Emits "DataCubeBurnt" event. Calls "mintFromCube" function from GameItemContract via IGameItem interface
    /// @dev modifier 'whenNotPaused' deprecated, will be deleted sooner
    /// @param _DCTokenID token id of specific DataCube
    /// @param _VLTokenID token id of specific ValidatorLicense
    /// @param _seasonID token id of season
    /// @param _DCQuality DataCube quality
    /// @param _receiver receiver's address of new item
    /// @param _DCBackendTokenID backend token id of specific DataCube
    /// @param _data metadata URL
    function open(
        uint256 _DCTokenID,
        uint256 _VLTokenID,
        uint256 _seasonID,
        uint8 _DCQuality,
        address _receiver,
        uint256 _DCBackendTokenID,
        string memory _data) public override whenNotPaused onlyDecoder {
        IGameItem(gameItemContractAddress).mintFromCube(
            _receiver,
            _VLTokenID,
            _seasonID,
            _DCQuality,
            _data);
        super._burn(_DCTokenID);
        emit DataCubeBurnt(_DCTokenID, _DCBackendTokenID);
    } 

    /// @dev inherits IDataCube interface
    /// TODO tech debt for current version - calls function from ERC721Upgradeable contract
    function burn(uint256 _tokenID) public override{
        super._burn(_tokenID);
    }

    /// @dev verifies if caller is an admin
    /// @dev inherited from contract ERC721Upgradeable
    /// TODO tech debt for current version - inherits same function from ERC721EnumerableUpgradeable contract
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal override virtual onlyAdminOrDecoder{
        super._beforeTokenTransfer(from,to,tokenId);
    }
}