// File: @openzeppelin/contracts/interfaces/IERC2981.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (interfaces/IERC2981.sol)

pragma solidity ^0.8.0;

import "../utils/introspection/IERC165.sol";

/**
 * @dev Interface for the NFT Royalty Standard.
 *
 * A standardized way to retrieve royalty payment information for non-fungible tokens (NFTs) to enable universal
 * support for royalty payments across all NFT marketplaces and ecosystem participants.
 *
 * _Available since v4.5._
 */
interface IERC2981 is IERC165 {
    /**
     * @dev Returns how much royalty is owed and to whom, based on a sale price that may be denominated in any unit of
     * exchange. The royalty amount is denominated and should be paid in that same unit of exchange.
     */
    function royaltyInfo(uint256 tokenId, uint256 salePrice)
        external
        view
        returns (address receiver, uint256 royaltyAmount);
}

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



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

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

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

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

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

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

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

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

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must 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/token/ERC721/IERC721Receiver.sol



// SPDX-License-Identifier: MIT
// 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



// 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 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 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 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) {
        (bool success, bytes memory returndata) = target.delegatecall(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/utils/Context.sol



// SPDX-License-Identifier: MIT
// 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/utils/introspection/ERC165.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

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



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

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1);

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator,
        Rounding rounding
    ) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10**64) {
                value /= 10**64;
                result += 64;
            }
            if (value >= 10**32) {
                value /= 10**32;
                result += 32;
            }
            if (value >= 10**16) {
                value /= 10**16;
                result += 16;
            }
            if (value >= 10**8) {
                value /= 10**8;
                result += 8;
            }
            if (value >= 10**4) {
                value /= 10**4;
                result += 4;
            }
            if (value >= 10**2) {
                value /= 10**2;
                result += 2;
            }
            if (value >= 10**1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0);
        }
    }
}

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



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

pragma solidity ^0.8.0;

import "./math/Math.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

// File: contracts/access/IAccessControlVF.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

interface IAccessControlVF {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(
        bytes32 indexed role,
        bytes32 indexed previousAdminRole,
        bytes32 indexed newAdminRole
    );

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(
        bytes32 indexed role,
        address indexed account,
        address indexed sender
    );

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(
        bytes32 indexed role,
        address indexed account,
        address indexed sender
    );

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account)
        external
        view
        returns (bool);

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function checkRole(bytes32 role, address account) external view;

    /**
     * @dev Returns bytes of default admin role
     */
    function getAdminRole() external view returns (bytes32);

    /**
     * @dev Returns bytes of token contract role
     */
    function getTokenContractRole() external view returns (bytes32);

    /**
     * @dev Returns bytes of sales contract role
     */
    function getSalesContractRole() external view returns (bytes32);

    /**
     * @dev Returns bytes of burner role
     */
    function getBurnerRole() external view returns (bytes32);

    /**
     * @dev Returns bytes of minter role
     */
    function getMinterRole() external view returns (bytes32);

    /**
     * @dev Returns a bytes array of roles that can be minters
     */
    function getMinterRoles() external view returns (bytes32[] memory);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;

    /**
     * @dev Selects the next minter from the minters array using the current minter index.
     * The current minter index should be incremented after each selection.  If the
     * current minter index + 1 is equal to the minters array length then the current
     * minter index should be set back to 0
     *
     * Requirements:
     *
     * - the caller must be an admin role
     */
    function selectNextMinter() external returns (address payable);

    /**
     * @dev Grants `minter` minter role and adds `minter` to minters array
     *
     * Requirements:
     *
     * - the caller must be an admin role
     */
    function grantMinterRole(address minter) external;

    /**
     * @dev Revokes minter role from `minter` and removes `minter` from minters array
     *
     * Requirements:
     *
     * - the caller must be an admin role
     */
    function revokeMinterRole(address minter) external;

    /**
     * @dev Distributes ETH evenly to all addresses in minters array
     */
    function fundMinters() external payable;
}

// File: contracts/examples/VFToken.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.4;

import "../token/ERC721VF.sol";
import "./VFTokenAllExtensions.sol";

contract VFToken is ERC721VF, VFTokenAllExtensions {
    //Token base URI
    string private _baseUri;

    /**
     * @dev Initializes the contract by setting a `initialBaseUri`, `name`, `symbol`,
     * and a `controlContractAddress` to the token collection.
     */
    constructor(
        string memory initialBaseUri,
        string memory name,
        string memory symbol,
        address controlContractAddress,
        address royaltiesContractAddress,
        address renderingContractAddress
    )
        ERC721VF(name, symbol)
        VFTokenAllExtensions(
            controlContractAddress,
            royaltiesContractAddress,
            renderingContractAddress
        )
    {
        string memory contractAddress = Strings.toHexString(
            uint160(address(this)),
            20
        );
        setBaseURI(
            string(
                abi.encodePacked(initialBaseUri, contractAddress, "/tokens/")
            )
        );
    }

    /**
     * @dev Get the base token URI
     */
    function _baseURI() internal view virtual override returns (string memory) {
        return _baseUri;
    }

    /**
     * @dev Update the base token URI
     *
     * Requirements:
     *
     * - the caller must be an admin role
     */
    function setBaseURI(string memory baseUri) public onlyRole(getAdminRole()) {
        _baseUri = baseUri;
    }

    /**
     * @dev Permanently lock minting
     *
     * Requirements:
     *
     * - the caller must be an admin role
     */
    function lockMintingPermanently() external onlyRole(getAdminRole()) {
        _lockMintingPermanently();
    }

    /**
     * @dev Set the active/inactive state of minting
     *
     * Requirements:
     *
     * - the caller must be an admin role
     */
    function toggleMintActive() external onlyRole(getAdminRole()) {
        _toggleMintActive();
    }

    /**
     * @dev Set the active/inactive state of burning
     *
     * Requirements:
     *
     * - the caller must be an admin role
     */
    function toggleBurnActive() external onlyRole(getAdminRole()) {
        _toggleBurnActive();
    }

    /**
     * @dev Airdrop `addresses` for `quantity` starting at `startTokenId`
     *
     * Requirements:
     *
     * - the caller must be a minter role
     * - minting must not be locked and must be active
     * - `addresses` and `quantities` must have the same length
     */
    function airdrop(
        address[] calldata addresses,
        uint256[] calldata quantities,
        uint256 startTokenId
    ) external onlyRoles(getMinterRoles()) notLocked mintActive {
        _airdrop(addresses, quantities, startTokenId);
    }

    /**
     * @dev mint batch `to` for `quantity` starting at `startTokenId`
     *
     * Requirements:
     *
     * - the caller must be a minter role
     * - minting must not be locked and must be active
     */
    function mintBatch(
        address to,
        uint8 quantity,
        uint256 startTokenId
    ) external onlyRoles(getMinterRoles()) notLocked mintActive {
        _mintBatch(to, quantity, startTokenId);
    }

    /**
     * @dev mint `to` token `tokenId`
     *
     * Requirements:
     *
     * - the caller must be a minter role
     * - minting must not be locked and must be active
     */
    function mint(
        address to,
        uint256 tokenId
    ) external onlyRoles(getMinterRoles()) notLocked mintActive {
        _mint(to, tokenId);
    }

    /**
     * @dev burn `from` token `tokenId`
     *
     * Requirements:
     *
     * - the caller must be a burner role
     * - burning must be active
     */
    function burn(
        address from,
        uint256 tokenId
    ) external onlyRole(getBurnerRole()) burnActive {
        _burn(from, tokenId, false);
    }

    /**
     * @dev If renderingContract is set then returns its tokenURI(tokenId)
     * return value, otherwise returns the standard baseTokenURI + tokenId.
     */
    function tokenURI(
        uint256 tokenId
    ) public view override returns (string memory) {
        if (getRenderingContract() != address(0)) {
            return renderingContractTokenURI(tokenId);
        }
        return super.tokenURI(tokenId);
    }
}

// File: contracts/examples/VFTokenAllExtensions.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import {AccessControlVFExtension} from "../extensions/accesscontrol/AccessControlVFExtension.sol";
import {RoyaltiesVFExtension} from "../extensions/royalties/RoyaltiesVFExtension.sol";
import {TokenURIGeneratorVFExtension} from "../extensions/tokenurigenerator/TokenURIGeneratorVFExtension.sol";
import {WithdrawVFExtension} from "../extensions/withdraw/WithdrawVFExtension.sol";

abstract contract VFTokenAllExtensions is
    AccessControlVFExtension,
    RoyaltiesVFExtension,
    TokenURIGeneratorVFExtension,
    WithdrawVFExtension
{
    constructor(
        address controlContractAddress,
        address royaltiesContractAddress,
        address renderingContractAddress
    )
        AccessControlVFExtension(controlContractAddress)
        RoyaltiesVFExtension(royaltiesContractAddress)
        TokenURIGeneratorVFExtension(renderingContractAddress)
    {}

    function setRoyaltiesContract(address royaltiesContractAddress)
        external
        onlyRole(getAdminRole())
    {
        super._setRoyaltiesContract(royaltiesContractAddress);
    }

    function setRenderingContract(address renderContractAddress)
        external
        onlyRole(getAdminRole())
    {
        super._setRenderingContract(renderContractAddress);
    }

    function withdrawMoney() external onlyRole(getAdminRole()) {
        super._withdrawMoney();
    }

    function withdrawToken(
        address contractAddress,
        address to,
        uint256 tokenId
    ) external onlyRole(getAdminRole()) {
        super._withdrawToken(contractAddress, to, tokenId);
    }
}

// File: contracts/extensions/accesscontrol/AccessControlVFExtension.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import {IAccessControlVF} from "../../access/IAccessControlVF.sol";
import {Context} from "@openzeppelin/contracts/utils/Context.sol";
import {IERC165} from "@openzeppelin/contracts/utils/introspection/IERC165.sol";

abstract contract AccessControlVFExtension is Context, IERC165 {
    //Contract for function access control
    IAccessControlVF private _controlContract;

    constructor(address controlContractAddress) {
        _controlContract = IAccessControlVF(controlContractAddress);
    }

    modifier onlyRole(bytes32 role) virtual {
        _controlContract.checkRole(role, _msgSender());
        _;
    }

    modifier onlyRoles(bytes32[] memory roles) virtual {
        bool hasRequiredRole = false;
        for (uint256 i; i < roles.length; i++) {
            bytes32 role = roles[i];
            if (_controlContract.hasRole(role, _msgSender())) {
                hasRequiredRole = true;
                break;
            }
        }
        require(hasRequiredRole, "Missing required role");
        _;
    }

    function getAdminRole() public view returns (bytes32) {
        return _controlContract.getAdminRole();
    }

    function getMinterRoles() public view returns (bytes32[] memory) {
        return _controlContract.getMinterRoles();
    }

    function getBurnerRole() public view returns (bytes32) {
        return _controlContract.getBurnerRole();
    }

    /**
     * @dev Update the access control contract
     *
     * Requirements:
     *
     * - the caller must be an admin role
     * - `controlContractAddress` must support the IVFAccesControl interface
     */
    function setControlContract(address controlContractAddress)
        external
        onlyRole(_controlContract.getAdminRole())
    {
        require(
            IERC165(controlContractAddress).supportsInterface(
                type(IAccessControlVF).interfaceId
            ),
            "Contract does not support required interface"
        );
        _controlContract = IAccessControlVF(controlContractAddress);
    }
}

// File: contracts/extensions/royalties/RoyaltiesVFExtension.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import {IRoyaltiesVF} from "../../royalties/IRoyaltiesVF.sol";
import {Context} from "@openzeppelin/contracts/utils/Context.sol";
import {IERC165} from "@openzeppelin/contracts/utils/introspection/IERC165.sol";
import {IERC2981} from "@openzeppelin/contracts/interfaces/IERC2981.sol";

abstract contract RoyaltiesVFExtension is Context, IERC165, IERC2981 {
    //Contract for function access control
    IRoyaltiesVF private _royaltiesContract;

    constructor(address royaltiesContractAddress) {
        _royaltiesContract = IRoyaltiesVF(royaltiesContractAddress);
    }

    /**
     * @dev Get royalty information for a token based on the `salePrice`
     */
    function royaltyInfo(uint256 tokenId, uint256 salePrice)
        external
        view
        returns (address receiver, uint256 royaltyAmount)
    {
        return
            _royaltiesContract.royaltyInfo(tokenId, address(this), salePrice);
    }

    /**
     * @dev Update the royalties contract
     *
     * Requirements:
     *
     * - the caller must be an admin role
     * - `royaltiesContractAddress` must support the IRoyaltiesVF interface
     */
    function _setRoyaltiesContract(address royaltiesContractAddress) internal {
        require(
            IERC165(royaltiesContractAddress).supportsInterface(
                type(IRoyaltiesVF).interfaceId
            ),
            "Contract does not support required interface"
        );
        _royaltiesContract = IRoyaltiesVF(royaltiesContractAddress);
    }
}

// File: contracts/extensions/tokenurigenerator/TokenURIGeneratorVFExtension.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import {ITokenURIGeneratorVF} from "../../urigenerator/ITokenURIGeneratorVF.sol";
import {Context} from "@openzeppelin/contracts/utils/Context.sol";
import {IERC165} from "@openzeppelin/contracts/utils/introspection/IERC165.sol";

abstract contract TokenURIGeneratorVFExtension is Context, IERC165 {
    //Contract for function access control
    ITokenURIGeneratorVF private _tokenURIGeneratorContract;

    constructor(address tokenURIGeneratorContractAddress) {
        if (tokenURIGeneratorContractAddress != address(0)) {
            _tokenURIGeneratorContract = ITokenURIGeneratorVF(
                tokenURIGeneratorContractAddress
            );
        }
    }

    function renderingContractTokenURI(uint256 tokenId)
        public
        view
        returns (string memory)
    {
        return _tokenURIGeneratorContract.tokenURI(tokenId);
    }

    function getRenderingContract() public view returns (address) {
        return address(_tokenURIGeneratorContract);
    }

    /**
     * @dev Update the royalties contract
     *
     * Requirements:
     *
     * - the caller must be an admin role
     * - `tokenURIGeneratorContractAddress` must support the IRoyaltiesVF interface
     */
    function _setRenderingContract(address tokenURIGeneratorContractAddress)
        internal
    {
        require(
            IERC165(tokenURIGeneratorContractAddress).supportsInterface(
                type(ITokenURIGeneratorVF).interfaceId
            ),
            "Contract does not support required interface"
        );
        _tokenURIGeneratorContract = ITokenURIGeneratorVF(
            tokenURIGeneratorContractAddress
        );
    }
}

// File: contracts/extensions/withdraw/WithdrawVFExtension.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import {Context} from "@openzeppelin/contracts/utils/Context.sol";

abstract contract WithdrawVFExtension is Context {
    constructor() {}

    /**
     * @dev Withdraw balance on contact to msg sender
     *
     * Requirements:
     *
     * - the caller must be an admin role
     */
    function _withdrawMoney() internal {
        address payable to = payable(_msgSender());
        to.transfer(address(this).balance);
    }

    /**
     * @dev Withdraw token if we need to refund
     *
     * Requirements:
     *
     * - `contractAddress` must support the IVFToken interface
     * - the caller must be an admin role
     */
    function _withdrawToken(
        address contractAddress,
        address to,
        uint256 tokenId
    ) internal {
        IERC721(contractAddress).transferFrom(address(this), to, tokenId);
    }
}

// File: contracts/royalties/IRoyaltiesVF.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

interface IRoyaltiesVF {
    /**
     * @dev Update the access control contract
     *
     * Requirements:
     *
     * - the caller must be an admin role
     * - `controlContractAddress` must support the IVFAccesControl interface
     */
    function setControlContract(address controlContractAddress) external;

    /**
     * @dev Get royalty information for a contract based on the `salePrice` of a token
     */
    function royaltyInfo(
        uint256,
        address contractAddress,
        uint256 salePrice
    ) external view returns (address receiver, uint256 royaltyAmount);

    /**
     * @dev Sets the royalty information that all ids in this contract will default to.
     *
     * Requirements:
     *
     * - `receiver` cannot be the zero address.
     * - `feeNumerator` cannot be greater than the fee denominator.
     */
    function setDefaultRoyalty(address receiver, uint96 feeNumerator) external;

    /**
     * @dev Removes default royalty information.
     */
    function deleteDefaultRoyalty() external;

    /**
     * @dev Sets the royalty information for `contractAddress`.
     *
     * Requirements:
     *
     * - `receiver` cannot be the zero address.
     * - `feeNumerator` cannot be greater than the fee denominator.
     */
    function setContractRoyalties(
        address contractAddress,
        address receiver,
        uint96 feeNumerator
    ) external;

    /**
     * @dev Removes royalty information for `contractAddress`.
     */
    function resetContractRoyalty(address contractAddress) external;
}

// File: contracts/token/ERC721VF.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC721VF.sol";
import "operator-filter-registry/src/DefaultOperatorFilterer.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts/utils/introspection/ERC165.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension.
 */
contract ERC721VF is Context, ERC165, IERC721VF, DefaultOperatorFilterer {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    // The number of tokens minted
    uint256 private _mintCounter;

    // The number of tokens burned
    uint256 private _burnCounter;

    //Flag to permanently lock minting
    bool public mintingPermanentlyLocked = false;
    //Flag to activate or disable minting
    bool public isMintActive = false;
    //Flag to activate or disable burning
    bool public isBurnActive = false;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    modifier notLocked() virtual {
        if (mintingPermanentlyLocked) {
            revert ERC721VFMintingPermanentlyLocked();
        }
        _;
    }

    modifier mintActive() virtual {
        if (!isMintActive) {
            revert ERC721VFMintIsNotActive();
        }
        _;
    }

    modifier burnActive() virtual {
        if (!isBurnActive) {
            revert ERC721VFBurnIsNotActive();
        }
        _;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId)
        public
        view
        virtual
        override(ERC165, IERC165)
        returns (bool)
    {
        return
            interfaceId == 0x80ac58cd || // ERC165 interface ID for ERC721
            interfaceId == 0x5b5e139f || // ERC165 interface ID for ERC721Metadata
            interfaceId == type(IERC721VF).interfaceId || // ERC165 interface ID for ERC721VF.
            super.supportsInterface(interfaceId); // ERC165 interface ID for ERC165
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner)
        public
        view
        virtual
        override
        returns (uint256)
    {
        if (owner == address(0)) {
            revert ERC721VFAddressZeroIsNotAValidOwner();
        }

        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId)
        public
        view
        virtual
        override
        returns (address)
    {
        address owner = _ownerOf(tokenId);
        if (owner == address(0)) {
            revert ERC721VFInvalidTokenID(tokenId);
        }
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId)
        public
        view
        virtual
        override
        returns (string memory)
    {
        _requireMinted(tokenId);

        string memory baseURI = _baseURI();
        return
            bytes(baseURI).length > 0
                ? string(abi.encodePacked(baseURI, tokenId.toString()))
                : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overridden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId)
        public
        virtual
        override
        onlyAllowedOperatorApproval(to)
    {
        address owner = ERC721VF.ownerOf(tokenId);
        if (to == owner) {
            revert ERC721VFApprovalToCurrentOwner(to, tokenId);
        }

        if (_msgSender() != owner && !isApprovedForAll(owner, _msgSender())) {
            revert ERC721VFApproveCallerIsNotTokenOwnerOrApprovedForAll(
                to,
                tokenId
            );
        }

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId)
        public
        view
        virtual
        override
        returns (address)
    {
        _requireMinted(tokenId);

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved)
        public
        virtual
        override
        onlyAllowedOperatorApproval(operator)
    {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator)
        public
        view
        virtual
        override
        returns (bool)
    {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override onlyAllowedOperator(from) {
        _transferFrom(from, to, tokenId, true);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override onlyAllowedOperator(from) {
        _safeTransferFrom(from, to, tokenId, true);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) public virtual override onlyAllowedOperator(from) {
        _safeTransferFrom(from, to, tokenId, true, data);
    }

    /**
     * @dev See {IERC721VF-totalSupply}.
     */
    function totalSupply() public view returns (uint256) {
        unchecked {
            return _mintCounter - _burnCounter;
        }
    }

    /**
     * @dev See {IERC721VF-totalMinted}.
     */
    function totalMinted() public view returns (uint256) {
        unchecked {
            return _mintCounter;
        }
    }

    /**
     * @dev See {IERC721VF-totalBurned}.
     */
    function totalBurned() public view returns (uint256) {
        unchecked {
            return _burnCounter;
        }
    }

    /**
     * @dev See {IERC721VF-tokensOfOwner}.
     */
    function tokensOfOwner(address owner)
        public
        view
        returns (uint256[] memory ownerTokens)
    {
        address currentOwnerAddress;
        uint256 tokenCount = balanceOf(owner);

        if (tokenCount == 0) {
            return new uint256[](0);
        } else {
            uint256[] memory result = new uint256[](tokenCount);
            uint256 resultIndex = 0;

            uint256 index;
            for (index = 0; resultIndex != tokenCount; index++) {
                currentOwnerAddress = _owners[index];
                if (currentOwnerAddress == owner) {
                    result[resultIndex++] = index;
                }
            }

            return result;
        }
    }

    /**
     * @dev See {IERC721VF-tokensOfOwnerIn}.
     */
    function tokensOfOwnerIn(
        address owner,
        uint256 startIndex,
        uint256 endIndex
    ) public view returns (uint256[] memory ownerTokens) {
        address currentOwnerAddress;
        uint256 tokenCount = balanceOf(owner);

        if (tokenCount == 0) {
            return new uint256[](0);
        } else {
            uint256[] memory result = new uint256[](tokenCount);
            uint256 resultIndex = 0;

            uint256 index = startIndex;
            for (index; index <= endIndex; index++) {
                currentOwnerAddress = _owners[index];
                if (currentOwnerAddress == owner) {
                    result[resultIndex++] = index;
                }
            }

            // Downsize the array to fit.
            assembly {
                mstore(result, resultIndex)
            }

            return result;
        }
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function _transferFrom(
        address from,
        address to,
        uint256 tokenId,
        bool approvalCheck
    ) internal virtual {
        //solhint-disable-next-line max-line-length

        if (approvalCheck) {
            if (!_isApprovedOrOwner(_msgSender(), tokenId)) {
                revert ERC721VFCallerIsNotTokenOwnerOrApproved(
                    from,
                    to,
                    tokenId
                );
            }
        }

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function _safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bool approvalCheck
    ) internal virtual {
        _safeTransferFrom(from, to, tokenId, approvalCheck, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function _safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bool approvalCheck,
        bytes memory data
    ) internal virtual {
        if (approvalCheck) {
            if (!_isApprovedOrOwner(_msgSender(), tokenId)) {
                revert ERC721VFCallerIsNotTokenOwnerOrApproved(
                    from,
                    to,
                    tokenId
                );
            }
        }
        _safeTransfer(from, to, tokenId, data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) internal virtual {
        _transfer(from, to, tokenId);
        if (!_checkOnERC721Received(from, to, tokenId, data)) {
            revert ERC721VFTransferToNonERC721VFReceiverImplementer(
                to,
                tokenId
            );
        }
    }

    /**
     * @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist
     */
    function _ownerOf(uint256 tokenId) internal view virtual returns (address) {
        return _owners[tokenId];
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _ownerOf(tokenId) != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId)
        internal
        view
        virtual
        returns (bool)
    {
        address owner = ERC721VF.ownerOf(tokenId);
        return (spender == owner ||
            isApprovedForAll(owner, spender) ||
            getApproved(tokenId) == spender);
    }

    /**
     * @dev Permanently lock minting
     *
     * Requirements:
     *
     * - the caller must be an admin role
     */
    function _lockMintingPermanently() internal {
        mintingPermanentlyLocked = true;
    }

    /**
     * @dev Set the active/inactive state of minting
     *
     * Requirements:
     *
     * - the caller must be an admin role
     */
    function _toggleMintActive() internal {
        isMintActive = !isMintActive;
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory data
    ) internal virtual {
        _mint(to, tokenId);
        if (!_checkOnERC721Received(address(0), to, tokenId, data)) {
            revert ERC721VFTransferToNonERC721VFReceiverImplementer(
                to,
                tokenId
            );
        }
    }

    /**
     * @dev Safely batch mints tokens starting at `startTokenId` until `quantity` is met and transfers them to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     * - Transfer to only ERC721Reciever implementers
     *
     * Emits a {Transfer} event.
     */
    function _safeMintBatch(
        address to,
        uint256 quantity,
        uint256 startTokenId
    ) internal returns (uint256 endToken) {
        uint256 tokenId = startTokenId;
        for (uint256 i; i < quantity; i++) {
            if (to == address(0)) {
                revert ERC721VFMintToTheZeroAddress();
            }

            if (_exists(tokenId)) {
                revert ERC721VFTokenAlreadyMinted(tokenId);
            }

            _beforeTokenTransfer(address(0), to, tokenId, 1);

            _balances[to] += 1;
            _owners[tokenId] = to;

            emit Transfer(address(0), to, tokenId);

            _afterTokenTransfer(address(0), to, tokenId, 1);

            if (!_checkOnERC721Received(address(0), to, tokenId, "")) {
                revert ERC721VFTransferToNonERC721VFReceiverImplementer(
                    to,
                    tokenId
                );
            }

            tokenId++;
        }

        unchecked {
            _mintCounter += quantity;
        }

        return tokenId;
    }

    /**
     * @dev Airdrop `addresses` for `quantity` starting at `startTokenId`
     *
     * Requirements:
     *
     * - the caller must be a minter role
     * - minting must not be locked and must be active
     * - `addresses` and `quantities` must have the same length
     */
    function _airdrop(
        address[] calldata addresses,
        uint256[] calldata quantities,
        uint256 startTokenId
    ) internal virtual {
        if (addresses.length != quantities.length) {
            revert ERC721VFAddressAndQuantitiesNeedToBeEqualLength();
        }

        for (uint256 i; i < addresses.length; i++) {
            startTokenId = _mintBatch(
                addresses[i],
                quantities[i],
                startTokenId
            );
        }
    }

    /**
     * @dev Batch mints tokens starting at `startTokenId` until `quantity` is met and transfers them to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _mintBatch(
        address to,
        uint256 quantity,
        uint256 startTokenId
    ) internal virtual returns (uint256 endToken) {
        uint256 tokenId = startTokenId;
        for (uint256 i; i < quantity; i++) {
            if (to == address(0)) {
                revert ERC721VFMintToTheZeroAddress();
            }

            if (_exists(tokenId)) {
                revert ERC721VFTokenAlreadyMinted(tokenId);
            }

            _beforeTokenTransfer(address(0), to, tokenId, 1);

            _owners[tokenId] = to;

            emit Transfer(address(0), to, tokenId);

            _afterTokenTransfer(address(0), to, tokenId, 1);

            tokenId++;
        }

        unchecked {
            _balances[to] += quantity;
            _mintCounter += quantity;
        }

        return tokenId;
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        if (to == address(0)) {
            revert ERC721VFMintToTheZeroAddress();
        }

        if (_exists(tokenId)) {
            revert ERC721VFTokenAlreadyMinted(tokenId);
        }

        _beforeTokenTransfer(address(0), to, tokenId, 1);

        unchecked {
            // Will not overflow unless all 2**256 token ids are minted to the same owner.
            // Given that tokens are minted one by one, it is impossible in practice that
            // this ever happens. Might change if we allow batch minting.
            // The ERC fails to describe this case.
            _balances[to] += 1;
        }

        _owners[tokenId] = to;

        unchecked {
            _mintCounter++;
        }

        emit Transfer(address(0), to, tokenId);

        _afterTokenTransfer(address(0), to, tokenId, 1);
    }

    /**
     * @dev Set the active/inactive state of burning
     *
     * Requirements:
     *
     * - the caller must be an admin role
     */
    function _toggleBurnActive() internal {
        isBurnActive = !isBurnActive;
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     * This is an internal function that does not check if the sender is authorized to operate on the token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(
        address from,
        uint256 tokenId,
        bool approvalCheck
    ) internal virtual {
        if (approvalCheck) {
            if (!_isApprovedOrOwner(from, tokenId)) {
                revert ERC721VFBurnCallerIsNotTokenOwnerOrApproved(
                    from,
                    tokenId
                );
            }
        }
        _burn(tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     * This is an internal function that does not check if the sender is authorized to operate on the token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721VF.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId, 1);

        // Clear approvals
        delete _tokenApprovals[tokenId];

        unchecked {
            // Cannot overflow, as that would require more tokens to be burned/transferred
            // out than the owner initially received through minting and transferring in.
            _balances[owner] -= 1;
        }
        delete _owners[tokenId];

        unchecked {
            _burnCounter++;
        }

        emit Transfer(owner, address(0), tokenId);

        _afterTokenTransfer(owner, address(0), tokenId, 1);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        if (to == address(0)) {
            revert ERC721VFTransferToTheZeroAddress();
        }

        if (ERC721VF.ownerOf(tokenId) != from) {
            revert ERC721VFTransferFromIncorrectOwner(from, tokenId);
        }

        _beforeTokenTransfer(from, to, tokenId, 1);

        // Clear approvals from the previous owner
        delete _tokenApprovals[tokenId];

        unchecked {
            // `_balances[from]` cannot overflow for the same reason as described in `_burn`:
            // `from`'s balance is the number of token held, which is at least one before the current
            // transfer.
            // `_balances[to]` could overflow in the conditions described in `_mint`. That would require
            // all 2**256 token ids to be minted, which in practice is impossible.
            _balances[from] -= 1;
            _balances[to] += 1;
        }
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId, 1);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits an {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721VF.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits an {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        if (owner == operator) {
            revert ERC721VFApproveToCaller();
        }
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Reverts if the `tokenId` has not been minted yet.
     */
    function _requireMinted(uint256 tokenId) internal view virtual {
        if (!_exists(tokenId)) {
            revert ERC721VFInvalidTokenID(tokenId);
        }
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) private returns (bool) {
        if (to.isContract()) {
            try
                IERC721Receiver(to).onERC721Received(
                    _msgSender(),
                    from,
                    tokenId,
                    data
                )
            returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert ERC721VFTransferToNonERC721VFReceiverImplementer(
                        to,
                        tokenId
                    );
                } else {
                    /// @solidity memory-safe-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId,
        uint256 batchSize
    ) internal virtual {}

    /**
     * @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`.
     * - When `from` is zero, the tokens were minted for `to`.
     * - When `to` is zero, ``from``'s tokens were burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 firstTokenId,
        uint256 batchSize
    ) internal virtual {}
}

// File: contracts/token/IERC721VF.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721VF compliant contract.
 */
interface IERC721VF is IERC165 {
    error ERC721VFAddressZeroIsNotAValidOwner();
    error ERC721VFInvalidTokenID(uint256 tokenId);
    error ERC721VFApprovalToCurrentOwner(address to, uint256 tokenId);
    error ERC721VFApproveCallerIsNotTokenOwnerOrApprovedForAll(
        address to,
        uint256 tokenId
    );
    error ERC721VFCallerIsNotTokenOwnerOrApproved(
        address from,
        address to,
        uint256 tokenId
    );
    error ERC721VFTransferToNonERC721VFReceiverImplementer(
        address to,
        uint256 tokenId
    );
    error ERC721VFAddressAndQuantitiesNeedToBeEqualLength();
    error ERC721VFMintToTheZeroAddress();
    error ERC721VFTokenAlreadyMinted(uint256 tokenId);
    error ERC721VFTransferToTheZeroAddress();
    error ERC721VFTransferFromIncorrectOwner(address from, uint256 tokenId);
    error ERC721VFApproveToCaller();
    error ERC721VFBurnCallerIsNotTokenOwnerOrApproved(
        address from,
        uint256 tokenId
    );
    error ERC721VFMintingPermanentlyLocked();
    error ERC721VFMintIsNotActive();
    error ERC721VFBurnIsNotActive();

    /**
     * @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 token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);

    /**
     * @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: contracts/urigenerator/ITokenURIGeneratorVF.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

interface ITokenURIGeneratorVF {
    /**
     * @dev Update the access control contract
     *
     * Requirements:
     *
     * - the caller must be an admin role
     * - `controlContractAddress` must support the IVFAccesControl interface
     */
    function setControlContract(address controlContractAddress) external;

    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// File: operator-filter-registry/src/DefaultOperatorFilterer.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import {OperatorFilterer} from "./OperatorFilterer.sol";

/**
 * @title  DefaultOperatorFilterer
 * @notice Inherits from OperatorFilterer and automatically subscribes to the default OpenSea subscription.
 */
abstract contract DefaultOperatorFilterer is OperatorFilterer {
    address constant DEFAULT_SUBSCRIPTION = address(0x3cc6CddA760b79bAfa08dF41ECFA224f810dCeB6);

    constructor() OperatorFilterer(DEFAULT_SUBSCRIPTION, true) {}
}

// File: operator-filter-registry/src/IOperatorFilterRegistry.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

interface IOperatorFilterRegistry {
    function isOperatorAllowed(address registrant, address operator) external view returns (bool);
    function register(address registrant) external;
    function registerAndSubscribe(address registrant, address subscription) external;
    function registerAndCopyEntries(address registrant, address registrantToCopy) external;
    function unregister(address addr) external;
    function updateOperator(address registrant, address operator, bool filtered) external;
    function updateOperators(address registrant, address[] calldata operators, bool filtered) external;
    function updateCodeHash(address registrant, bytes32 codehash, bool filtered) external;
    function updateCodeHashes(address registrant, bytes32[] calldata codeHashes, bool filtered) external;
    function subscribe(address registrant, address registrantToSubscribe) external;
    function unsubscribe(address registrant, bool copyExistingEntries) external;
    function subscriptionOf(address addr) external returns (address registrant);
    function subscribers(address registrant) external returns (address[] memory);
    function subscriberAt(address registrant, uint256 index) external returns (address);
    function copyEntriesOf(address registrant, address registrantToCopy) external;
    function isOperatorFiltered(address registrant, address operator) external returns (bool);
    function isCodeHashOfFiltered(address registrant, address operatorWithCode) external returns (bool);
    function isCodeHashFiltered(address registrant, bytes32 codeHash) external returns (bool);
    function filteredOperators(address addr) external returns (address[] memory);
    function filteredCodeHashes(address addr) external returns (bytes32[] memory);
    function filteredOperatorAt(address registrant, uint256 index) external returns (address);
    function filteredCodeHashAt(address registrant, uint256 index) external returns (bytes32);
    function isRegistered(address addr) external returns (bool);
    function codeHashOf(address addr) external returns (bytes32);
}

// File: operator-filter-registry/src/OperatorFilterer.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import {IOperatorFilterRegistry} from "./IOperatorFilterRegistry.sol";

/**
 * @title  OperatorFilterer
 * @notice Abstract contract whose constructor automatically registers and optionally subscribes to or copies another
 *         registrant's entries in the OperatorFilterRegistry.
 * @dev    This smart contract is meant to be inherited by token contracts so they can use the following:
 *         - `onlyAllowedOperator` modifier for `transferFrom` and `safeTransferFrom` methods.
 *         - `onlyAllowedOperatorApproval` modifier for `approve` and `setApprovalForAll` methods.
 */
abstract contract OperatorFilterer {
    error OperatorNotAllowed(address operator);

    IOperatorFilterRegistry public constant OPERATOR_FILTER_REGISTRY =
        IOperatorFilterRegistry(0x000000000000AAeB6D7670E522A718067333cd4E);

    constructor(address subscriptionOrRegistrantToCopy, bool subscribe) {
        // If an inheriting token contract is deployed to a network without the registry deployed, the modifier
        // will not revert, but the contract will need to be registered with the registry once it is deployed in
        // order for the modifier to filter addresses.
        if (address(OPERATOR_FILTER_REGISTRY).code.length > 0) {
            if (subscribe) {
                OPERATOR_FILTER_REGISTRY.registerAndSubscribe(address(this), subscriptionOrRegistrantToCopy);
            } else {
                if (subscriptionOrRegistrantToCopy != address(0)) {
                    OPERATOR_FILTER_REGISTRY.registerAndCopyEntries(address(this), subscriptionOrRegistrantToCopy);
                } else {
                    OPERATOR_FILTER_REGISTRY.register(address(this));
                }
            }
        }
    }

    modifier onlyAllowedOperator(address from) virtual {
        // Allow spending tokens from addresses with balance
        // Note that this still allows listings and marketplaces with escrow to transfer tokens if transferred
        // from an EOA.
        if (from != msg.sender) {
            _checkFilterOperator(msg.sender);
        }
        _;
    }

    modifier onlyAllowedOperatorApproval(address operator) virtual {
        _checkFilterOperator(operator);
        _;
    }

    function _checkFilterOperator(address operator) internal view virtual {
        // Check registry code length to facilitate testing in environments without a deployed registry.
        if (address(OPERATOR_FILTER_REGISTRY).code.length > 0) {
            if (!OPERATOR_FILTER_REGISTRY.isOperatorAllowed(address(this), operator)) {
                revert OperatorNotAllowed(operator);
            }
        }
    }
}