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



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

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";

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

    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }

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

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

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

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

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

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

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// File: @openzeppelin/contracts-upgradeable/interfaces/IERC20Upgradeable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC20.sol)

pragma solidity ^0.8.0;

import "../token/ERC20/IERC20Upgradeable.sol";

// File: @openzeppelin/contracts-upgradeable/interfaces/IERC721EnumerableUpgradeable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../token/ERC721/extensions/IERC721EnumerableUpgradeable.sol";

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.1) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.sol";

/**
 * @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 proxied contracts do not make use of 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.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * 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 prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

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

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized < type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}

// File: @openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../IERC721Upgradeable.sol";

/**
 * @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);

    /**
     * @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/IERC721Upgradeable.sol



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

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165Upgradeable.sol";

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

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

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

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

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

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

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

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



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

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

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

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

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

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

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

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

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



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

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

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

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

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

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface 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: @uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router01.sol



pragma solidity >=0.6.2;

interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

// File: @uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol



pragma solidity >=0.6.2;

import './IUniswapV2Router01.sol';

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

// File: contracts/ManageableUpgradeable.sol



/* SPDX-License-Identifier: UNLICENSED */

pragma solidity ^0.8.17;

import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";

abstract contract ManageableUpgradeable is OwnableUpgradeable {
    mapping(address => bool) private _managers;
    event ManagerAdded(address indexed manager_);
    event ManagerRemoved(address indexed manager_);

    function managers(address manager_) public view virtual returns (bool) {
        return _managers[manager_];
    }

    modifier onlyManager() {
        require(_managers[_msgSender()], "Manageable: caller is not the owner");
        _;
    }

    function removeManager(address manager_) public virtual onlyOwner {
        _managers[manager_] = false;
        emit ManagerRemoved(manager_);
    }

    function addManager(address manager_) public virtual onlyOwner {
        require(
            manager_ != address(0),
            "Manageable: new owner is the zero address"
        );
        _managers[manager_] = true;
        emit ManagerAdded(manager_);
    }
}

// File: contracts/Staking.sol



/* SPDX-License-Identifier: UNLICENSED */

pragma solidity ^0.8.17;

import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/interfaces/IERC20Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/interfaces/IERC721EnumerableUpgradeable.sol";
import "@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol";
import "./ManageableUpgradeable.sol";

interface IERC20Mintable is IERC20Upgradeable {
    function circulatingSupply() external view returns (uint256);

    function mint(address to, uint256 amount) external;

    function burnFrom(address to, uint256 amount) external;
}

contract Staking is Initializable, OwnableUpgradeable, ManageableUpgradeable {
    struct Init {
        uint256 precision;
        address payable growth;
        address token;
        address xburns;
        address nft;
        address router;
        uint256[] circSupThreshold_;
        uint256[] fixedAPYs_;
        uint256 minDuration_;
        uint256 maxDuration_;
        uint256 stakeFees_;
        uint256 refShare_;
        uint256 unstakeFees_;
        uint256 claimFeeThreshold_;
        uint256 nftBonus;
    }

    struct Stake {
        uint256 id;
        uint256 amount;
        uint256 apy;
        uint256 duration;
        uint256 startTimestamp;
    }
    uint256 public PRECISION;

    address payable public GROWTH;
    IERC20Mintable public TOKEN;
    IERC20Mintable public XBURNS;
    IERC721EnumerableUpgradeable public NFT;
    IUniswapV2Router02 public ROUTER;

    uint256[] public circSupThreshold;
    uint256[] public fixedAPYs;

    uint256 public minDuration;
    uint256 public maxDuration;

    uint256 public stakeFees;
    uint256 public refShare;
    uint256 public unstakeFees;

    uint256 public claimFeeThreshold;
    uint256 public claimFeeCounter;

    uint256 public nftBonus;

    uint256 public nStakes;

    uint256 public totalStaked;

    mapping(address => Stake[]) public stakes;
    mapping(address => bool) public isBlacklisted;
    mapping(address => uint256) public nReferred;
    mapping(address => uint256) public amountFromRef;
    mapping(uint256 => bool) public isXBurnsStake;

    function initialize(Init memory init) public initializer {
        __Ownable_init();
        PRECISION = init.precision;

        GROWTH = init.growth;
        TOKEN = IERC20Mintable(init.token);
        XBURNS = IERC20Mintable(init.xburns);
        NFT = IERC721EnumerableUpgradeable(init.nft);
        ROUTER = IUniswapV2Router02(init.router);

        circSupThreshold = init.circSupThreshold_;
        fixedAPYs = init.fixedAPYs_;

        minDuration = init.minDuration_;
        maxDuration = init.maxDuration_;

        stakeFees = init.stakeFees_;
        refShare = init.refShare_;
        unstakeFees = init.unstakeFees_;

        claimFeeThreshold = init.claimFeeThreshold_;
        claimFeeCounter = 0;

        nftBonus = init.nftBonus;

        nStakes = 0;
        totalStaked = 0;

        emit OwnershipTransferred(address(0), _msgSender());
    }

    function getCurrentAPY() public view returns (uint256 currAPY) {
        uint256 circSupply = TOKEN.totalSupply() -
            TOKEN.balanceOf(address(this));
        for (uint8 i = 0; i < fixedAPYs.length; i++) {
            if (totalStaked <= (circSupply * circSupThreshold[i]) / PRECISION)
                return fixedAPYs[i];
        }
        return 0;
    }

    function stake(
        uint256 amount,
        uint256 duration,
        address ref,
        bool boost
    ) public {
        require(ref != _msgSender(), "STAKE: Can't referrer yourself.");
        require(
            TOKEN.balanceOf(_msgSender()) >= amount,
            "STAKE: Unsufficient balance"
        );
        require(
            TOKEN.allowance(_msgSender(), address(this)) >= amount,
            "STAKE: Unsufficient allowance"
        );
        require(duration <= maxDuration, "STAKE: Invalid duration");
        require(duration >= minDuration, "STAKE: Invalid duration");

        uint256 apy = getCurrentAPY();

        if (boost) {
            NFT.transferFrom(
                _msgSender(),
                address(0x000000000000000000000000000000000000dEaD),
                NFT.tokenOfOwnerByIndex(_msgSender(), 0)
            );
            apy += nftBonus;
        }

        TOKEN.burnFrom(_msgSender(), amount);

        uint256 fees = (amount * stakeFees) / PRECISION;
        amount -= fees;
        uint256 toRef = (amount * refShare) / PRECISION;

        if (toRef > 0) {
            mintOrSend(ref, toRef);
            amountFromRef[ref] += toRef;
            nReferred[ref]++;
        }

        totalStaked += amount;
        nStakes++;
        stakes[_msgSender()].push(
            Stake(nStakes, amount, apy, duration, block.timestamp)
        );
    }

    function stakeXburns(uint256 amount, uint256 duration, bool boost) public {
        require(
            XBURNS.balanceOf(_msgSender()) >= amount,
            "STAKE: Unsufficient balance"
        );
        require(
            XBURNS.allowance(_msgSender(), address(this)) >= amount,
            "STAKE: Unsufficient allowance"
        );
        require(duration <= maxDuration, "STAKE: Invalid duration");
        require(duration >= minDuration, "STAKE: Invalid duration");

        uint256 apy = getCurrentAPY();

        if (boost) {
            NFT.transferFrom(
                _msgSender(),
                address(0x000000000000000000000000000000000000dEaD),
                NFT.tokenOfOwnerByIndex(_msgSender(), 0)
            );
            apy += nftBonus;
        }

        XBURNS.burnFrom(_msgSender(), amount);

        uint256 fees = (amount * stakeFees) / PRECISION;
        amount -= fees;

        nStakes++;
        isXBurnsStake[nStakes] = true;
        stakes[_msgSender()].push(
            Stake(nStakes, amount, apy, duration, block.timestamp)
        );
    }

    function stakeEth(
        uint256 duration,
        address ref,
        bool boost
    ) public payable {
        require(ref != _msgSender(), "STAKE: Can't referrer yourself.");
        require(duration <= maxDuration, "STAKE: Invalid duration");
        require(duration >= minDuration, "STAKE: Invalid duration");

        address[] memory path = new address[](2);
        path[0] = ROUTER.WETH();
        path[1] = address(TOKEN);

        uint256 amountOut = ROUTER.getAmountsOut(msg.value, path)[0];

        ROUTER.swapExactETHForTokensSupportingFeeOnTransferTokens{
            value: msg.value
        }(0, path, GROWTH, block.timestamp);

        TOKEN.burnFrom(address(this), amountOut);

        uint256 fees = (amountOut * stakeFees) / PRECISION;
        amountOut -= fees;
        uint256 toRef = (amountOut * refShare) / PRECISION;

        mintOrSend(ref, toRef);

        uint256 apy = getCurrentAPY();

        if (boost) {
            NFT.transferFrom(
                _msgSender(),
                address(0x000000000000000000000000000000000000dEaD),
                NFT.tokenOfOwnerByIndex(_msgSender(), 0)
            );
            apy += nftBonus;
        }

        nStakes++;
        totalStaked += amountOut;

        stakes[_msgSender()].push(
            Stake(nStakes, amountOut, apy, duration, block.timestamp)
        );
    }

    function unstake(uint256 index) public {
        require(index < stakes[_msgSender()].length, "UNSTAKE: Invalid index");
        Stake memory stake_ = stakes[_msgSender()][index];
        require(
            block.timestamp >= stake_.startTimestamp + stake_.duration,
            "UNSTAKE: You must wait the whole duration"
        );

        uint256 timeSinceFinished = block.timestamp -
            (stake_.startTimestamp + stake_.duration);

        uint256 fractionOfYear = (stake_.duration * PRECISION) / 365 / 86400;
        uint256 apyForDuration = stake_.apy * fractionOfYear;

        uint256 amount = stake_.amount +
            (stake_.amount * apyForDuration) /
            PRECISION /
            1000;

        if (stakes[_msgSender()].length > 1) {
            stakes[_msgSender()][index] = stakes[_msgSender()][
                stakes[_msgSender()].length - 1
            ];
        }
        stakes[_msgSender()].pop();

        totalStaked -= stake_.amount;

        uint256 fees = (amount * unstakeFees) / PRECISION;

        if (timeSinceFinished >= 14 * 86400) {
            fees +=
                (((amount * (timeSinceFinished - 14 * 86400) * PRECISION) / 7) *
                    86400) /
                PRECISION /
                100;
        }

        amount -= fees;

        if (amount > 0) mintOrSend(_msgSender(), amount);
        if (fees > 0) processClaimFee(fees);
    }

    function emergencyUnstake(uint256 index) public {
        require(
            index < stakes[_msgSender()].length,
            "EMERGENCY: Invalid index"
        );
        Stake memory stake_ = stakes[_msgSender()][index];
        require(!isXBurnsStake[stake_.id], "EMERGENCY: Can't unstake XBURNS");
        require(
            block.timestamp < stake_.duration + stake_.startTimestamp,
            "EMERGENCY: Can't emergency unstake a completed stake"
        );
        uint256 halfwayPoint = stake_.duration / 2;
        uint256 amount = 0;
        uint256 fees = 0;
        if (block.timestamp >= halfwayPoint + stake_.startTimestamp) {
            uint256 fractionOfYear = ((block.timestamp -
                stake_.startTimestamp *
                PRECISION) / 365) / 86400;
            uint256 apyForDuration = stake_.apy * fractionOfYear;

            amount =
                stake_.amount +
                (stake_.amount * apyForDuration) /
                PRECISION /
                1000;

            fees = (amount * unstakeFees) / PRECISION;
            amount -= fees;
        } else {
            uint256 timeSinceStart = block.timestamp - stake_.startTimestamp;
            uint256 fractionOfHalfway = (timeSinceStart * 100) / halfwayPoint;

            amount = (stake_.amount * fractionOfHalfway) / 100;
        }

        totalStaked -= stake_.amount;

        if (stakes[_msgSender()].length > 1) {
            stakes[_msgSender()][index] = stakes[_msgSender()][
                stakes[_msgSender()].length - 1
            ];
        }
        stakes[_msgSender()].pop();

        if (amount > 0) mintOrSend(_msgSender(), amount);
        if (fees > 0) processClaimFee(fees);
    }

    function processClaimFee(uint256 amount) internal {
        claimFeeCounter += amount;
        if (claimFeeCounter >= claimFeeThreshold) {
            if (TOKEN.balanceOf(address(this)) < claimFeeCounter)
                TOKEN.mint(address(this), claimFeeCounter);
            address[] memory path = new address[](2);
            path[0] = address(TOKEN);
            path[1] = ROUTER.WETH();

            ROUTER.swapExactTokensForETHSupportingFeeOnTransferTokens(
                claimFeeCounter,
                0,
                path,
                GROWTH,
                block.timestamp
            );

            claimFeeCounter = 0;
        }
    }

    function mintOrSend(address user, uint256 amount) internal {
        if (TOKEN.balanceOf(address(this)) > amount)
            TOKEN.transfer(user, amount);
        else TOKEN.mint(user, amount);
    }

    function getRefStats(address user) public view returns (uint256, uint256) {
        return (amountFromRef[user], nReferred[user]);
    }

    function getUserStakes(address user) public view returns (Stake[] memory) {
        return stakes[user];
    }

    function updatePrecision(uint256 value) public onlyOwner {
        PRECISION = value;
    }

    function updateGrowth(address payable value) public onlyOwner {
        GROWTH = value;
    }

    function updateToken(address value) public onlyOwner {
        TOKEN = IERC20Mintable(value);
    }

    function updateNft(address value) public onlyOwner {
        NFT = IERC721EnumerableUpgradeable(value);
    }

    function updateRouter(address value) public onlyOwner {
        ROUTER = IUniswapV2Router02(value);
    }

    function updateApys(
        uint256[] memory circSup,
        uint256[] memory apys
    ) public onlyOwner {
        require(circSup.length == apys.length, "Invalid arrays");
        circSupThreshold = circSup;
        fixedAPYs = apys;
    }

    function updateMinDuration(uint256 value) public onlyOwner {
        minDuration = value;
    }

    function updateMaxDuration(uint256 value) public onlyOwner {
        maxDuration = value;
    }

    function updateStakeFees(uint256 value) public onlyOwner {
        stakeFees = value;
    }

    function updateRefShare(uint256 value) public onlyOwner {
        refShare = value;
    }

    function updateUnstakeFees(uint256 value) public onlyOwner {
        unstakeFees = value;
    }

    function updateClaimFeeThreshold(uint256 value) public onlyOwner {
        claimFeeThreshold = value;
    }

    function updateNftBonus(uint256 value) public onlyOwner {
        nftBonus = value;
    }

    function setIsBlacklisted(address user, bool value) public onlyOwner {
        isBlacklisted[user] = value;
    }

    function updateXburns(address value) public onlyOwner {
        XBURNS = IERC20Mintable(value);
    }

    receive() external payable {}

    fallback() external payable {}
}