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// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol


// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// File: @openzeppelin/contracts/utils/Address.sol


// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

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

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol


// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// File: @openzeppelin/contracts/utils/introspection/IERC165.sol


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

pragma solidity ^0.8.0;

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

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol


// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;


/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

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

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

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

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol


// 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 IERC20 {
    /**
     * @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/token/ERC20/utils/SafeERC20.sol


// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;




/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: @openzeppelin/contracts/utils/Context.sol


// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

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

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

// File: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts (last updated v4.7.0) (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 Ownable is Context {
    address private _owner;

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

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

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

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

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

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

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

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

// File: contracts/main.sol

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.16;

//import "hardhat/console.sol";






contract Main is Ownable, IERC721Receiver {
    using SafeERC20 for IERC20;
    using SafeERC20 for IERC721;
    uint rnd_index;
    enum STATUS {ACTIVE, FINISHED, CANCELLED, EXPIRED}
    struct Raffle {
        uint id;
        STATUS status;
        uint max_per_user; // max raffle by user
        uint total; // raffle size
        address nft;
        uint nft_id;
        address winner;
        address[] users;
        uint users_length;
        address seller;
        uint price;
        uint amount;
        uint endtime;

    }

    address FEE_RECIPIENT1;
    constructor() {
        FEE_RECIPIENT1 = msg.sender;
    }
    struct NFT {
        STATUS status;
        uint fee;
        uint royalties;
        address royalties_recipient;
        uint listing_fee;
        address listing_fee_recipient;
        string name;
        string twitter;
        string tg;
        uint category;
    }

    mapping(address => NFT) public properties;
    address[] public all_contracts;

    function add_nft(address nft, uint fee, address royalties_recipient, uint royalties,
        uint listing_fee, address listing_fee_recipient, STATUS status,
        string memory name, string memory twitter, string memory tg, uint category) external onlyOwner {
        require(properties[nft].fee == 0, "already exists");
        all_contracts.push(nft);
        _nft(nft, fee, royalties_recipient, royalties,
            listing_fee, listing_fee_recipient, status,
            name, twitter, tg, category);
    }

    function edit_nft(address nft, uint fee, address royalties_recipient, uint royalties,
        uint listing_fee, address listing_fee_recipient, STATUS status,
        string memory name, string memory twitter, string memory tg, uint category) external onlyOwner {
        _nft(nft, fee, royalties_recipient, royalties,
            listing_fee, listing_fee_recipient, status,
            name, twitter, tg, category);
    }

    function _nft(address nft, uint fee, address royalties_recipient, uint royalties,
        uint listing_fee, address listing_fee_recipient, STATUS status,
        string memory name, string memory twitter, string memory tg, uint category) internal {
        properties[nft].fee = fee;
        properties[nft].status = status;
        properties[nft].royalties_recipient = royalties_recipient;
        properties[nft].royalties = royalties;
        properties[nft].listing_fee = listing_fee;
        properties[nft].listing_fee_recipient = listing_fee_recipient;
        properties[nft].name = name;
        properties[nft].twitter = twitter;
        properties[nft].tg = tg;
        properties[nft].category = category;

        collect_fee_from_expired();
        // process expired
    }

    function setFeeRecipient(address treasure) public onlyOwner {
        FEE_RECIPIENT1 = treasure;
    }

    function moreRand() public view returns (uint, bytes32) {
        uint _previousBlockNumber;
        bytes32 _previousBlockHash;
        _previousBlockNumber = uint(block.number - 1);
        _previousBlockHash = bytes32(blockhash(_previousBlockNumber));
        return (_previousBlockNumber, _previousBlockHash);
    }


    Raffle[] public raffles;

    function getAllNnft() public view returns (address[] memory){
        return all_contracts;
    }

    function getUsersByRaffleId(uint id) public view returns (address[] memory){
        return raffles[id].users;
    }

    function getActiveRaffles() public view returns (Raffle[] memory){
        return getRafflesByStatus(STATUS.ACTIVE);
    }

    function getFinishedRaffles() public view returns (Raffle[] memory){
        return getRafflesByStatus(STATUS.FINISHED);
    }

    function getCancelledRaffles() public view returns (Raffle[] memory){
        return getRafflesByStatus(STATUS.CANCELLED);
    }

    function getRafflesByStatus(STATUS s) public view returns (Raffle[] memory){
        uint total;
        for (uint i = 0; i < raffles.length; i++) {
            if (raffles[i].status != s)
                continue;
            total++;
        }
        Raffle[] memory r = new Raffle[](total);
        uint j;
        for (uint i = 0; i < raffles.length; i++) {
            if (raffles[i].status != s)
                continue;
            r[j++] = raffles[i];
        }
        return r;
    }

    function getRafflesByNftAndStatus(address nft, STATUS s) public view returns (Raffle[] memory){
        uint total;
        for (uint i = 0; i < raffles.length; i++) {
            if( raffles[i].nft != nft )
                continue;
            if (raffles[i].status != s)
                continue;
            total++;
        }
        Raffle[] memory r = new Raffle[](total);
        uint j;
        for (uint i = 0; i < raffles.length; i++) {
            if( raffles[i].nft != nft )
                continue;
            if (raffles[i].status != s)
                continue;
            r[j++] = raffles[i];
        }
        return r;
    }

    function getRafflesByCategory(uint category, STATUS s) public view returns (Raffle[] memory){
        uint total;
        for (uint i = 0; i < raffles.length; i++) {
            address nft = raffles[i].nft;
            if( properties[nft].category != category )
                continue;
            if (raffles[i].status != s)
                continue;
            total++;
        }
        Raffle[] memory r = new Raffle[](total);
        uint j;
        for (uint i = 0; i < raffles.length; i++) {
            address nft = raffles[i].nft;
            if( properties[nft].category != category )
                continue;
            if (raffles[i].status != s)
                continue;
            r[j++] = raffles[i];
        }
        return r;
    }

    event Create_Raffle(uint _max_per_user, address _nft, uint _nft_id, uint _price, uint _total, uint index, uint endtime);

    function create_raffle(uint _max_per_user, address _nft, uint _nft_id, uint _price, uint _total, uint _endtime) public payable {
        require(_max_per_user > 0, "E1");
        require(_price > 10000, "E2");
        require(_total > 2, "E3");
        require(_nft != address(0), "E4");
        require(properties[_nft].status != STATUS.ACTIVE, "E5");
        require(properties[_nft].listing_fee == 0 || properties[_nft].listing_fee == msg.value, "E6");
        require(_endtime >= 1 hours && _endtime <= 90 days, "E7");

        address[] memory _users = new address[](0);
        Raffle memory raffle = Raffle({
        id : raffles.length,
        status : STATUS.ACTIVE,
        max_per_user : _max_per_user,
        total : _total,
        nft : _nft,
        nft_id : _nft_id,
        winner : address(0),
        users : _users,
        users_length : 0,
        seller : msg.sender,
        price : _price,
        amount : 0,
        endtime : block.timestamp + _endtime});

        raffles.push(raffle);

        IERC721 token = IERC721(raffle.nft);

        require(
            token.ownerOf(raffle.nft_id) == msg.sender,
            "NFT is not owned by caller"
        );
        token.safeTransferFrom(msg.sender, address(this), raffle.nft_id);
        emit Create_Raffle(_max_per_user, _nft, _nft_id, _price, _total, raffles.length - 1, _endtime);

        collect_fee_from_expired();
        // process expired

    }

    event Buy(uint amount, uint raffle_id, uint value, uint users, uint total, uint ticket);
    event Refund(address user, uint value, uint paid, uint total);

    function buy(uint amount, uint raffle_id) payable public {
        Raffle storage raffle = raffles[raffle_id];
        require(raffle.status == STATUS.ACTIVE, "!ACTIVE");
        require(msg.value >= raffle.price * amount, "Price incorrect");

        uint paid = 0;
        for (uint i = 0; i < amount; i ++) {
            raffle.users.push(msg.sender);
            raffle.users_length ++;
            paid += raffle.price;
            emit Buy(amount, raffle_id, msg.value, raffle.users.length, raffle.total, i);
            //console.log('users=%s total=%s', raffle.users.length, raffle.total);
            if (raffle.users.length >= raffle.total) {
                _trigger(raffle_id);
                break;
            }
        }

        raffle.amount += paid;

        if (msg.value - paid > 0) {
            // refund user
            (bool success, bytes memory data) = msg.sender.call{value : msg.value - paid}("");
            require(success, "error refunding user.");
            emit Refund(msg.sender, msg.value, paid, msg.value - paid);
        }

        collect_fee_from_expired();
        // process expired

    }

    function onERC721Received(address, address, uint256, bytes memory) public virtual override returns (bytes4) {
        return this.onERC721Received.selector;
    }

    function _trigger(uint raffle_id) internal {
        //console.log('trigger!');
        Raffle storage raffle = raffles[raffle_id];
        (uint _previousBlockNumber, bytes32 _previousBlockHash) = moreRand();
        uint total = raffle.users.length;
        uint256 _mod = total - 1;
        uint256 _randomNumber;
        bytes32 _structHash = keccak256(abi.encode(msg.sender, block.difficulty, gasleft(),
            block.timestamp, _previousBlockNumber, _previousBlockHash, ++rnd_index));
        _randomNumber = uint256(_structHash);
        assembly {_randomNumber := mod(_randomNumber, _mod)}
        raffle.winner = raffle.users[_randomNumber];
        raffle.status = STATUS.FINISHED;
        //console.log('raffle.winner=%s _randomNumber=%s', raffle.winner, _randomNumber);
        IERC721(raffle.nft).safeTransferFrom(address(this), raffle.winner, raffle.nft_id);
        payments(raffle_id, _randomNumber);
        collect_fee(raffle_id);
    }

    event Trigger(uint raffle_id, uint amount, uint fee, uint royalties, address winner, uint number);

    function payments(uint raffle_id, uint _randomNumber) internal {
        Raffle storage raffle = raffles[raffle_id];
        uint total = raffle.amount;
        uint amount = 0;
        uint fee = 0;
        uint royalties = 0;
        if (properties[raffle.nft].fee > 0) {
            fee = (total * properties[raffle.nft].fee) / 100;
            amount = total - fee;
            if (properties[raffle.nft].royalties > 0) {
                royalties = (fee * properties[raffle.nft].royalties) / 100;
                fee -= royalties;
                (bool success, bytes memory data) = properties[raffle.nft].royalties_recipient.call{value : royalties}("");
                require(success, "error paying royalties");
            }

            (bool success, bytes memory data) = FEE_RECIPIENT1.call{value : fee}("");
            require(success, "error paying fee");
        }
        (bool success, bytes memory data) = raffle.seller.call{value : amount}("");
        require(success, "error paying seller");
        emit Trigger(raffle_id, amount, fee, royalties, raffle.winner, _randomNumber);
    }

    // owner can cancel the raffle any time and refund everyone
    function cancel(uint raffle_id) public {
        Raffle storage raffle = raffles[raffle_id];
        require(raffle.seller == msg.sender, "not owner");
        _revert(raffle_id);
    }


    event Revert(uint raffle_id);

    function _revert(uint raffle_id) internal {
        Raffle storage raffle = raffles[raffle_id];
        require(raffle.status == STATUS.ACTIVE, "!ACTIVE");
        for (uint i = 0; i < raffle.users.length; i ++) {
            //console.log('i=%s total=%s', i, raffle.total);
            (bool success, bytes memory data) = raffle.users[i].call{value : raffle.price}("");
            require(success, "error refunding user");
        }
        //
        IERC721(raffle.nft).safeTransferFrom(address(this), msg.sender, raffle.nft_id);
        raffle.status = STATUS.EXPIRED;
        collect_fee(raffle_id);
        emit Revert(raffle_id);
    }

    uint public _collectFee = 10;

    function setCallerFee(uint _fee) public onlyOwner {
        _collectFee = _fee;
    }

    event collectFee(address user, uint listing_fee, uint fee, uint caller_fee, uint collectFee);

    function collect_fee(uint raffle_id) internal {
        Raffle storage raffle = raffles[raffle_id];
        NFT storage nft = properties[raffle.nft];
        uint fee = nft.listing_fee;
        if (fee > 0) {
            uint caller_fee = (fee * _collectFee) / 100;
            fee -= caller_fee;
            (bool success1, bytes memory data1) = nft.listing_fee_recipient.call{value : fee}("");
            require(success1, "error paying listing fee");
            (bool success2, bytes memory data2) = msg.sender.call{value : caller_fee}("");
            require(success2, "error paying sender");
            emit collectFee(msg.sender, nft.listing_fee, fee, caller_fee, _collectFee);
        }
    }

    function collect_fee_from_expired() public {
        for (uint raffle_id = 0; raffle_id < raffles.length; raffle_id++) {
            Raffle storage raffle = raffles[raffle_id];
            if (raffle.status != STATUS.ACTIVE)
                continue;
            if (block.timestamp < raffle.endtime)
                continue;
            _revert(raffle_id);
        }
    }

    // how much is fee available to collect?
    function amount_fee_from_expired() public view returns (uint) {
        uint total;
        for (uint raffle_id = 0; raffle_id < raffles.length; raffle_id++) {
            Raffle storage raffle = raffles[raffle_id];
            if (raffle.status != STATUS.ACTIVE)
                continue;
            if (block.timestamp < raffle.endtime)
                continue;
            NFT storage nft = properties[raffle.nft];
            total += (nft.listing_fee * _collectFee) / 100;
        }
        return total;
    }
}

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