creation_sourcecode: {{
    "language": "Solidity",
    "sources": {
      "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/Initializable.sol)\n\npragma solidity ^0.8.2;\n\nimport \"../../utils/AddressUpgradeable.sol\";\n\n/**\n * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed\n * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an\n * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer\n * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.\n *\n * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be\n * reused. This mechanism prevents re-execution of each \"step\" but allows the creation of new initialization steps in\n * case an upgrade adds a module that needs to be initialized.\n *\n * For example:\n *\n * [.hljs-theme-light.nopadding]\n * ```solidity\n * contract MyToken is ERC20Upgradeable {\n *     function initialize() initializer public {\n *         __ERC20_init(\"MyToken\", \"MTK\");\n *     }\n * }\n *\n * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {\n *     function initializeV2() reinitializer(2) public {\n *         __ERC20Permit_init(\"MyToken\");\n *     }\n * }\n * ```\n *\n * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as\n * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.\n *\n * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure\n * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.\n *\n * [CAUTION]\n * ====\n * Avoid leaving a contract uninitialized.\n *\n * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation\n * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke\n * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:\n *\n * [.hljs-theme-light.nopadding]\n * ```\n * /// @custom:oz-upgrades-unsafe-allow constructor\n * constructor() {\n *     _disableInitializers();\n * }\n * ```\n * ====\n */\nabstract contract Initializable {\n    /**\n     * @dev Indicates that the contract has been initialized.\n     * @custom:oz-retyped-from bool\n     */\n    uint8 private _initialized;\n\n    /**\n     * @dev Indicates that the contract is in the process of being initialized.\n     */\n    bool private _initializing;\n\n    /**\n     * @dev Triggered when the contract has been initialized or reinitialized.\n     */\n    event Initialized(uint8 version);\n\n    /**\n     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,\n     * `onlyInitializing` functions can be used to initialize parent contracts.\n     *\n     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a\n     * constructor.\n     *\n     * Emits an {Initialized} event.\n     */\n    modifier initializer() {\n        bool isTopLevelCall = !_initializing;\n        require(\n            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),\n            \"Initializable: contract is already initialized\"\n        );\n        _initialized = 1;\n        if (isTopLevelCall) {\n            _initializing = true;\n        }\n        _;\n        if (isTopLevelCall) {\n            _initializing = false;\n            emit Initialized(1);\n        }\n    }\n\n    /**\n     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the\n     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be\n     * used to initialize parent contracts.\n     *\n     * A reinitializer may be used after the original initialization step. This is essential to configure modules that\n     * are added through upgrades and that require initialization.\n     *\n     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`\n     * cannot be nested. If one is invoked in the context of another, execution will revert.\n     *\n     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in\n     * a contract, executing them in the right order is up to the developer or operator.\n     *\n     * WARNING: setting the version to 255 will prevent any future reinitialization.\n     *\n     * Emits an {Initialized} event.\n     */\n    modifier reinitializer(uint8 version) {\n        require(!_initializing && _initialized < version, \"Initializable: contract is already initialized\");\n        _initialized = version;\n        _initializing = true;\n        _;\n        _initializing = false;\n        emit Initialized(version);\n    }\n\n    /**\n     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the\n     * {initializer} and {reinitializer} modifiers, directly or indirectly.\n     */\n    modifier onlyInitializing() {\n        require(_initializing, \"Initializable: contract is not initializing\");\n        _;\n    }\n\n    /**\n     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.\n     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized\n     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called\n     * through proxies.\n     *\n     * Emits an {Initialized} event the first time it is successfully executed.\n     */\n    function _disableInitializers() internal virtual {\n        require(!_initializing, \"Initializable: contract is initializing\");\n        if (_initialized != type(uint8).max) {\n            _initialized = type(uint8).max;\n            emit Initialized(type(uint8).max);\n        }\n    }\n\n    /**\n     * @dev Returns the highest version that has been initialized. See {reinitializer}.\n     */\n    function _getInitializedVersion() internal view returns (uint8) {\n        return _initialized;\n    }\n\n    /**\n     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.\n     */\n    function _isInitializing() internal view returns (bool) {\n        return _initializing;\n    }\n}\n"
      },
      "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)\n\npragma solidity ^0.8.1;\n\n/**\n * @dev Collection of functions related to the address type\n */\nlibrary AddressUpgradeable {\n    /**\n     * @dev Returns true if `account` is a contract.\n     *\n     * [IMPORTANT]\n     * ====\n     * It is unsafe to assume that an address for which this function returns\n     * false is an externally-owned account (EOA) and not a contract.\n     *\n     * Among others, `isContract` will return false for the following\n     * types of addresses:\n     *\n     *  - an externally-owned account\n     *  - a contract in construction\n     *  - an address where a contract will be created\n     *  - an address where a contract lived, but was destroyed\n     *\n     * Furthermore, `isContract` will also return true if the target contract within\n     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,\n     * which only has an effect at the end of a transaction.\n     * ====\n     *\n     * [IMPORTANT]\n     * ====\n     * You shouldn't rely on `isContract` to protect against flash loan attacks!\n     *\n     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets\n     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract\n     * constructor.\n     * ====\n     */\n    function isContract(address account) internal view returns (bool) {\n        // This method relies on extcodesize/address.code.length, which returns 0\n        // for contracts in construction, since the code is only stored at the end\n        // of the constructor execution.\n\n        return account.code.length > 0;\n    }\n\n    /**\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\n     * `recipient`, forwarding all available gas and reverting on errors.\n     *\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\n     * imposed by `transfer`, making them unable to receive funds via\n     * `transfer`. {sendValue} removes this limitation.\n     *\n     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].\n     *\n     * IMPORTANT: because control is transferred to `recipient`, care must be\n     * taken to not create reentrancy vulnerabilities. Consider using\n     * {ReentrancyGuard} or the\n     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\n     */\n    function sendValue(address payable recipient, uint256 amount) internal {\n        require(address(this).balance >= amount, \"Address: insufficient balance\");\n\n        (bool success, ) = recipient.call{value: amount}(\"\");\n        require(success, \"Address: unable to send value, recipient may have reverted\");\n    }\n\n    /**\n     * @dev Performs a Solidity function call using a low level `call`. A\n     * plain `call` is an unsafe replacement for a function call: use this\n     * function instead.\n     *\n     * If `target` reverts with a revert reason, it is bubbled up by this\n     * function (like regular Solidity function calls).\n     *\n     * Returns the raw returned data. To convert to the expected return value,\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\n     *\n     * Requirements:\n     *\n     * - `target` must be a contract.\n     * - calling `target` with `data` must not revert.\n     *\n     * _Available since v3.1._\n     */\n    function functionCall(address target, bytes memory data) internal returns (bytes memory) {\n        return functionCallWithValue(target, data, 0, \"Address: low-level call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\n     * `errorMessage` as a fallback revert reason when `target` reverts.\n     *\n     * _Available since v3.1._\n     */\n    function functionCall(\n        address target,\n        bytes memory data,\n        string memory errorMessage\n    ) internal returns (bytes memory) {\n        return functionCallWithValue(target, data, 0, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but also transferring `value` wei to `target`.\n     *\n     * Requirements:\n     *\n     * - the calling contract must have an ETH balance of at least `value`.\n     * - the called Solidity function must be `payable`.\n     *\n     * _Available since v3.1._\n     */\n    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {\n        return functionCallWithValue(target, data, value, \"Address: low-level call with value failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\n     *\n     * _Available since v3.1._\n     */\n    function functionCallWithValue(\n        address target,\n        bytes memory data,\n        uint256 value,\n        string memory errorMessage\n    ) internal returns (bytes memory) {\n        require(address(this).balance >= value, \"Address: insufficient balance for call\");\n        (bool success, bytes memory returndata) = target.call{value: value}(data);\n        return verifyCallResultFromTarget(target, success, returndata, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but performing a static call.\n     *\n     * _Available since v3.3._\n     */\n    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {\n        return functionStaticCall(target, data, \"Address: low-level static call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n     * but performing a static call.\n     *\n     * _Available since v3.3._\n     */\n    function functionStaticCall(\n        address target,\n        bytes memory data,\n        string memory errorMessage\n    ) internal view returns (bytes memory) {\n        (bool success, bytes memory returndata) = target.staticcall(data);\n        return verifyCallResultFromTarget(target, success, returndata, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but performing a delegate call.\n     *\n     * _Available since v3.4._\n     */\n    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {\n        return functionDelegateCall(target, data, \"Address: low-level delegate call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n     * but performing a delegate call.\n     *\n     * _Available since v3.4._\n     */\n    function functionDelegateCall(\n        address target,\n        bytes memory data,\n        string memory errorMessage\n    ) internal returns (bytes memory) {\n        (bool success, bytes memory returndata) = target.delegatecall(data);\n        return verifyCallResultFromTarget(target, success, returndata, errorMessage);\n    }\n\n    /**\n     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling\n     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.\n     *\n     * _Available since v4.8._\n     */\n    function verifyCallResultFromTarget(\n        address target,\n        bool success,\n        bytes memory returndata,\n        string memory errorMessage\n    ) internal view returns (bytes memory) {\n        if (success) {\n            if (returndata.length == 0) {\n                // only check isContract if the call was successful and the return data is empty\n                // otherwise we already know that it was a contract\n                require(isContract(target), \"Address: call to non-contract\");\n            }\n            return returndata;\n        } else {\n            _revert(returndata, errorMessage);\n        }\n    }\n\n    /**\n     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the\n     * revert reason or using the provided one.\n     *\n     * _Available since v4.3._\n     */\n    function verifyCallResult(\n        bool success,\n        bytes memory returndata,\n        string memory errorMessage\n    ) internal pure returns (bytes memory) {\n        if (success) {\n            return returndata;\n        } else {\n            _revert(returndata, errorMessage);\n        }\n    }\n\n    function _revert(bytes memory returndata, string memory errorMessage) private pure {\n        // Look for revert reason and bubble it up if present\n        if (returndata.length > 0) {\n            // The easiest way to bubble the revert reason is using memory via assembly\n            /// @solidity memory-safe-assembly\n            assembly {\n                let returndata_size := mload(returndata)\n                revert(add(32, returndata), returndata_size)\n            }\n        } else {\n            revert(errorMessage);\n        }\n    }\n}\n"
      },
      "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)\n\npragma solidity ^0.8.20;\n\n/**\n * @dev Interface of the ERC20 standard as defined in the EIP.\n */\ninterface IERC20 {\n    /**\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\n     * another (`to`).\n     *\n     * Note that `value` may be zero.\n     */\n    event Transfer(address indexed from, address indexed to, uint256 value);\n\n    /**\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\n     * a call to {approve}. `value` is the new allowance.\n     */\n    event Approval(address indexed owner, address indexed spender, uint256 value);\n\n    /**\n     * @dev Returns the value of tokens in existence.\n     */\n    function totalSupply() external view returns (uint256);\n\n    /**\n     * @dev Returns the value of tokens owned by `account`.\n     */\n    function balanceOf(address account) external view returns (uint256);\n\n    /**\n     * @dev Moves a `value` amount of tokens from the caller's account to `to`.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transfer(address to, uint256 value) external returns (bool);\n\n    /**\n     * @dev Returns the remaining number of tokens that `spender` will be\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\n     * zero by default.\n     *\n     * This value changes when {approve} or {transferFrom} are called.\n     */\n    function allowance(address owner, address spender) external view returns (uint256);\n\n    /**\n     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the\n     * caller's tokens.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\n     * that someone may use both the old and the new allowance by unfortunate\n     * transaction ordering. One possible solution to mitigate this race\n     * condition is to first reduce the spender's allowance to 0 and set the\n     * desired value afterwards:\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n     *\n     * Emits an {Approval} event.\n     */\n    function approve(address spender, uint256 value) external returns (bool);\n\n    /**\n     * @dev Moves a `value` amount of tokens from `from` to `to` using the\n     * allowance mechanism. `value` is then deducted from the caller's\n     * allowance.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transferFrom(address from, address to, uint256 value) external returns (bool);\n}\n"
      },
      "@openzeppelin/contracts/token/ERC721/IERC721.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/IERC721.sol)\n\npragma solidity ^0.8.20;\n\nimport {IERC165} from \"../../utils/introspection/IERC165.sol\";\n\n/**\n * @dev Required interface of an ERC721 compliant contract.\n */\ninterface IERC721 is IERC165 {\n    /**\n     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.\n     */\n    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);\n\n    /**\n     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.\n     */\n    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);\n\n    /**\n     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.\n     */\n    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);\n\n    /**\n     * @dev Returns the number of tokens in ``owner``'s account.\n     */\n    function balanceOf(address owner) external view returns (uint256 balance);\n\n    /**\n     * @dev Returns the owner of the `tokenId` token.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must exist.\n     */\n    function ownerOf(uint256 tokenId) external view returns (address owner);\n\n    /**\n     * @dev Safely transfers `tokenId` token from `from` to `to`.\n     *\n     * Requirements:\n     *\n     * - `from` cannot be the zero address.\n     * - `to` cannot be the zero address.\n     * - `tokenId` token must exist and be owned by `from`.\n     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.\n     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon\n     *   a safe transfer.\n     *\n     * Emits a {Transfer} event.\n     */\n    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;\n\n    /**\n     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients\n     * are aware of the ERC721 protocol to prevent tokens from being forever locked.\n     *\n     * Requirements:\n     *\n     * - `from` cannot be the zero address.\n     * - `to` cannot be the zero address.\n     * - `tokenId` token must exist and be owned by `from`.\n     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or\n     *   {setApprovalForAll}.\n     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon\n     *   a safe transfer.\n     *\n     * Emits a {Transfer} event.\n     */\n    function safeTransferFrom(address from, address to, uint256 tokenId) external;\n\n    /**\n     * @dev Transfers `tokenId` token from `from` to `to`.\n     *\n     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721\n     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must\n     * understand this adds an external call which potentially creates a reentrancy vulnerability.\n     *\n     * Requirements:\n     *\n     * - `from` cannot be the zero address.\n     * - `to` cannot be the zero address.\n     * - `tokenId` token must be owned by `from`.\n     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transferFrom(address from, address to, uint256 tokenId) external;\n\n    /**\n     * @dev Gives permission to `to` to transfer `tokenId` token to another account.\n     * The approval is cleared when the token is transferred.\n     *\n     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.\n     *\n     * Requirements:\n     *\n     * - The caller must own the token or be an approved operator.\n     * - `tokenId` must exist.\n     *\n     * Emits an {Approval} event.\n     */\n    function approve(address to, uint256 tokenId) external;\n\n    /**\n     * @dev Approve or remove `operator` as an operator for the caller.\n     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.\n     *\n     * Requirements:\n     *\n     * - The `operator` cannot be the address zero.\n     *\n     * Emits an {ApprovalForAll} event.\n     */\n    function setApprovalForAll(address operator, bool approved) external;\n\n    /**\n     * @dev Returns the account approved for `tokenId` token.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must exist.\n     */\n    function getApproved(uint256 tokenId) external view returns (address operator);\n\n    /**\n     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.\n     *\n     * See {setApprovalForAll}\n     */\n    function isApprovedForAll(address owner, address operator) external view returns (bool);\n}\n"
      },
      "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/IERC721Receiver.sol)\n\npragma solidity ^0.8.20;\n\n/**\n * @title ERC721 token receiver interface\n * @dev Interface for any contract that wants to support safeTransfers\n * from ERC721 asset contracts.\n */\ninterface IERC721Receiver {\n    /**\n     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}\n     * by `operator` from `from`, this function is called.\n     *\n     * It must return its Solidity selector to confirm the token transfer.\n     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be\n     * reverted.\n     *\n     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.\n     */\n    function onERC721Received(\n        address operator,\n        address from,\n        uint256 tokenId,\n        bytes calldata data\n    ) external returns (bytes4);\n}\n"
      },
      "@openzeppelin/contracts/utils/introspection/IERC165.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (utils/introspection/IERC165.sol)\n\npragma solidity ^0.8.20;\n\n/**\n * @dev Interface of the ERC165 standard, as defined in the\n * https://eips.ethereum.org/EIPS/eip-165[EIP].\n *\n * Implementers can declare support of contract interfaces, which can then be\n * queried by others ({ERC165Checker}).\n *\n * For an implementation, see {ERC165}.\n */\ninterface IERC165 {\n    /**\n     * @dev Returns true if this contract implements the interface defined by\n     * `interfaceId`. See the corresponding\n     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]\n     * to learn more about how these ids are created.\n     *\n     * This function call must use less than 30 000 gas.\n     */\n    function supportsInterface(bytes4 interfaceId) external view returns (bool);\n}\n"
      },
      "contracts/HashNFTStakingContract.sol": {
        "content": "// SPDX-License-Identifier: MIT\r\npragma solidity >=0.8.4;\r\n\r\nimport \"@openzeppelin/contracts/token/ERC721/IERC721.sol\";\r\nimport \"@openzeppelin/contracts/token/ERC20/IERC20.sol\";\r\nimport \"@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol\";\r\nimport \"@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol\";\r\n\r\ncontract HashNFTStakingContract is IERC721Receiver, Initializable {\r\n\r\n    address public daoAdmin;\r\n    bool public canClaim;\r\n\r\n    IERC721 public nftToken;\r\n    IERC20 public erc20Token;\r\n\r\n    address public constant collectionAddress =\r\n        0xD07e72b00431af84AD438CA995Fd9a7F0207542d;\r\n    \r\n    uint256 public tokensPerBlock;\r\n    \r\n\r\n    struct stake {\r\n        uint256 tokenId;\r\n        uint256 stakedFromBlock;\r\n        address owner;\r\n    }\r\n\r\n    // TokenID => Stake\r\n    mapping(uint256 => stake) public receipt;\r\n\r\n    uint256 public numberOfStaked;\r\n\r\n    uint256[] public _allTokens;\r\n    mapping(uint256 => uint256) public _allTokensIndex;\r\n\r\n    mapping(address => mapping(uint256 => uint256)) public _ownedTokens;\r\n    mapping(uint256 => uint256) public _ownedTokensIndex;\r\n    mapping(address => uint256) public _balances;\r\n\r\n    event NftStaked(\r\n        address indexed staker,\r\n        uint256 tokenId,\r\n        uint256 blockNumber\r\n    );\r\n    event NftUnStaked(\r\n        address indexed staker,\r\n        uint256 tokenId,\r\n        uint256 blockNumber\r\n    );\r\n    event StakePayout(\r\n        address indexed staker,\r\n        uint256 tokenId,\r\n        uint256 stakeAmount,\r\n        uint256 fromBlock,\r\n        uint256 toBlock\r\n    );\r\n    event StakeRewardUpdated(uint256 rewardPerBlock);\r\n\r\n    // // modifier onlyStaker(uint256 tokenId) {\r\n    // //     // require that this contract has the NFT\r\n    // //     require(\r\n    // //         nftToken.ownerOf(tokenId) == address(this),\r\n    // //         \"onlyStaker: Contract is not owner of this NFT\"\r\n    // //     );\r\n\r\n    // //     // require that this token is staked\r\n    // //     require(\r\n    // //         receipt[tokenId].stakedFromBlock != 0,\r\n    // //         \"onlyStaker: Token is not staked\"\r\n    // //     );\r\n\r\n    // //     // require that msg.sender is the owner of this nft\r\n    // //     require(\r\n    // //         receipt[tokenId].owner == msg.sender,\r\n    // //         \"onlyStaker: Caller is not NFT stake owner\"\r\n    // //     );\r\n\r\n    // //     _;\r\n    // // }\r\n\r\n    modifier requireTimeElapsed(uint256 tokenId) {\r\n        // require that some time has elapsed (IE you can not stake and unstake in the same block)\r\n        require(\r\n            receipt[tokenId].stakedFromBlock < block.number,\r\n            \"requireTimeElapsed: Can not stake/unStake/claim in same block\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    modifier onlyDao() {\r\n        require(msg.sender == daoAdmin, \"reclaimTokens: Caller is not the DAO\");\r\n        _;\r\n    }\r\n\r\n    function initialize() initializer public {\r\n        canClaim = false;\r\n        daoAdmin = msg.sender;\r\n    }\r\n\r\n    function onERC721Received(\r\n        address,\r\n        address,\r\n        uint256,\r\n        bytes memory\r\n    ) public virtual override returns (bytes4) {\r\n        return this.onERC721Received.selector;\r\n    }\r\n\r\n    //User must give this contract permission to take ownership of it.\r\n    function stakeNFT(uint256[] calldata tokenId)\r\n        public\r\n        returns (bool)\r\n    {\r\n        // allow for staking multiple NFTS at one time.\r\n        for (uint256 i = 0; i < tokenId.length; i++) {\r\n            _stakeNFT(tokenId[i]);\r\n            _addTokenToOwnerEnumeration(msg.sender, tokenId[i]);\r\n        }\r\n\r\n        return true;\r\n    }\r\n\r\n    function getStakeContractBalance() public view returns (uint256) {\r\n        return erc20Token.balanceOf(address(this));\r\n    }\r\n\r\n    //Call Total Stake earn for TargetAddress\r\n    function getCurrentTotalStakeEarned(address targetAddress)\r\n        external\r\n        view\r\n        returns (uint256)\r\n    {\r\n        uint256[] memory tokenIds = new uint256[](_balances[targetAddress]);\r\n        uint256[] memory tokenRewards = new uint256[](_balances[targetAddress]);\r\n        uint256 result;\r\n        for (uint256 i = 0; i < _balances[targetAddress]; i++) {\r\n            tokenIds[i] = _ownedTokens[targetAddress][i];\r\n            result += tokenRewards[i];\r\n        }\r\n        return (result);\r\n    }\r\n\r\n    //Call Stake earn of every token owned for TargetAddress\r\n    function getCurrentStakeEarned(uint256 tokenId)\r\n        public\r\n        view\r\n        returns (uint256)\r\n    {\r\n        return _getTimeStaked(tokenId) * (tokensPerBlock);\r\n    }\r\n\r\n    function unStakeNFT(uint256[] calldata tokenId)\r\n        public\r\n        returns (bool)\r\n    {\r\n        for (uint256 i = 0; i < tokenId.length; i++) {\r\n            _unStakeNFT(tokenId[i]);\r\n            // _removeTokenFromOwnerEnumeration(msg.sender, tokenId[i]);\r\n        }\r\n        return true;\r\n    }\r\n\r\n    function _unStakeNFT(uint256 tokenId)\r\n        internal\r\n        // onlyStaker(tokenId)\r\n        requireTimeElapsed(tokenId)\r\n        returns (bool)\r\n    {\r\n        // delete stake record, effectively unstaking it\r\n        delete receipt[tokenId];\r\n\r\n        // return token\r\n        nftToken.safeTransferFrom(address(this), msg.sender, tokenId);\r\n\r\n        emit NftUnStaked(msg.sender, tokenId, block.number);\r\n\r\n        return true;\r\n    }\r\n\r\n\r\n    function getStaked(address targetAddress)\r\n        external\r\n        view\r\n        returns (string[] memory, uint256[] memory)\r\n    {\r\n        string[] memory uris = new string[](_balances[targetAddress]);\r\n        uint256[] memory tokenIds = new uint256[](_balances[targetAddress]);\r\n        for (uint256 i = 0; i < _balances[targetAddress]; i++) {\r\n            tokenIds[i] = _ownedTokens[targetAddress][i];\r\n        }\r\n        return (uris, tokenIds);\r\n    }\r\n\r\n    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {\r\n        _allTokensIndex[tokenId] = _allTokens.length;\r\n        _allTokens.push(tokenId);\r\n    }\r\n\r\n    // function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {\r\n    //     // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and\r\n    //     // then delete the last slot (swap and pop).\r\n\r\n    //     uint256 lastTokenIndex = _allTokens.length - 1;\r\n    //     uint256 tokenIndex = _allTokensIndex[tokenId];\r\n\r\n    //     // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so\r\n    //     // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding\r\n    //     // an 'if' statement (like in _removeTokenFromOwnerEnumeration)\r\n    //     uint256 lastTokenId = _allTokens[lastTokenIndex];\r\n\r\n    //     _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token\r\n    //     _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index\r\n\r\n    //     // This also deletes the contents at the last position of the array\r\n    //     delete _allTokensIndex[tokenId];\r\n    //     _allTokens.pop();\r\n    // }\r\n\r\n    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {\r\n        uint256 length = _balances[to];\r\n        _ownedTokens[to][length] = tokenId;\r\n        _ownedTokensIndex[tokenId] = length;\r\n        _balances[to]++;\r\n        _addTokenToAllTokensEnumeration(tokenId);\r\n        numberOfStaked++;\r\n    }\r\n\r\n    // function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId)\r\n    //     private\r\n    // {\r\n    //     // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and\r\n    //     // then delete the last slot (swap and pop).\r\n\r\n    //     uint256 lastTokenIndex = _balances[from] - 1;\r\n    //     uint256 tokenIndex = _ownedTokensIndex[tokenId];\r\n\r\n    //     // When the token to delete is the last token, the swap operation is unnecessary\r\n    //     if (tokenIndex != lastTokenIndex) {\r\n    //         uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];\r\n\r\n    //         _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token\r\n    //         _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index\r\n    //     }\r\n\r\n    //     // This also deletes the contents at the last position of the array\r\n    //     delete _ownedTokensIndex[tokenId];\r\n    //     delete _ownedTokens[from][lastTokenIndex];\r\n    //     _balances[from]--;\r\n    //     // _removeTokenFromAllTokensEnumeration(tokenId);\r\n    //     numberOfStaked--;\r\n    // }\r\n\r\n    //Allows you to claim rewards, but canClaim must be true\r\n    function claimRewards(uint256 tokenId) external {\r\n        require(canClaim == true, \"You cannot claim yet!\");\r\n\r\n        // update receipt with a new block number\r\n        receipt[tokenId].stakedFromBlock = block.number;\r\n    }\r\n\r\n    function changeTokensPerblock(uint256 _tokensPerBlock) public onlyDao {\r\n        tokensPerBlock = _tokensPerBlock;\r\n\r\n        emit StakeRewardUpdated(tokensPerBlock);\r\n    }\r\n\r\n    function reclaimTokens() external onlyDao {\r\n        erc20Token.transfer(daoAdmin, erc20Token.balanceOf(address(this)));\r\n    }\r\n\r\n    function setCanClaim(bool _state) public onlyDao {\r\n        canClaim = _state;\r\n    }\r\n\r\n    function userCanClaim() public view returns (bool) {\r\n        return canClaim;\r\n    }\r\n\r\n    function _stakeNFT(uint256 tokenId) internal returns (bool) {\r\n        // require this token is not already staked\r\n        require(\r\n            receipt[tokenId].stakedFromBlock == 0,\r\n            \"Stake: Token is already staked\"\r\n        );\r\n\r\n        // require this token is not already owned by this contract\r\n        require(\r\n            nftToken.ownerOf(tokenId) != address(this),\r\n            \"Stake: Token is already staked in this contract\"\r\n        );\r\n\r\n        // take possession of the NFT\r\n        nftToken.safeTransferFrom(msg.sender, address(this), tokenId);\r\n\r\n        // check that this contract is the owner\r\n        require(\r\n            nftToken.ownerOf(tokenId) == address(this),\r\n            \"Stake: Failed to take possession of NFT\"\r\n        );\r\n\r\n        // start the staking from this block.\r\n        receipt[tokenId].tokenId = tokenId;\r\n        receipt[tokenId].stakedFromBlock = block.number;\r\n        receipt[tokenId].owner = msg.sender;\r\n\r\n        emit NftStaked(msg.sender, tokenId, block.number);\r\n\r\n        return true;\r\n    }\r\n\r\n    function _getTimeStaked(uint256 tokenId) internal view returns (uint256) {\r\n        if (receipt[tokenId].stakedFromBlock == 0) {\r\n            return 0;\r\n        }\r\n\r\n        return block.number - (receipt[tokenId].stakedFromBlock);\r\n    }\r\n\r\n    /** Add Function to allow the DAO to forcibly unstake an NFT and return it to the owner */\r\n}\r\n"
      }
    },
    "settings": {
      "optimizer": {
        "enabled": true,
        "runs": 200
      },
      "viaIR": true,
      "outputSelection": {
        "*": {
          "*": [
            "evm.bytecode",
            "evm.deployedBytecode",
            "devdoc",
            "userdoc",
            "metadata",
            "abi"
          ]
        }
      },
      "libraries": {}
    }
  }}