// File: IOperatorFilterRegistry.sol



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: OperatorFilterer.sol



pragma solidity ^0.8.13;




/**

 * @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);

            }

        }

    }

}


// File: DefaultOperatorFilterer.sol



pragma solidity ^0.8.13;




/**

 * @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: Math.sol



// 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, "Math: mulDiv overflow");



            ///////////////////////////////////////////////

            // 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 << 3) < value ? 1 : 0);

        }

    }

}
// File: Strings.sol



// OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol)



pragma solidity ^0.8.0;




/**

 * @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: IERC721A.sol



// ERC721A Contracts v4.0.0

// Creator: Chiru Labs



pragma solidity ^0.8.4;



/**

 * @dev Interface of an ERC721A compliant contract.

 */

interface IERC721A {

    /**

     * The caller must own the token or be an approved operator.

     */

    error ApprovalCallerNotOwnerNorApproved();



    /**

     * The token does not exist.

     */

    error ApprovalQueryForNonexistentToken();



    /**

     * The caller cannot approve to their own address.

     */

    error ApproveToCaller();



    /**

     * The caller cannot approve to the current owner.

     */

    error ApprovalToCurrentOwner();



    /**

     * Cannot query the balance for the zero address.

     */

    error BalanceQueryForZeroAddress();



    /**

     * Cannot mint to the zero address.

     */

    error MintToZeroAddress();



    /**

     * The quantity of tokens minted must be more than zero.

     */

    error MintZeroQuantity();



    /**

     * The token does not exist.

     */

    error OwnerQueryForNonexistentToken();



    /**

     * The caller must own the token or be an approved operator.

     */

    error TransferCallerNotOwnerNorApproved();



    /**

     * The token must be owned by `from`.

     */

    error TransferFromIncorrectOwner();



    /**

     * Cannot safely transfer to a contract that does not implement the ERC721Receiver interface.

     */

    error TransferToNonERC721ReceiverImplementer();



    /**

     * Cannot transfer to the zero address.

     */

    error TransferToZeroAddress();



    /**

     * The token does not exist.

     */

    error URIQueryForNonexistentToken();



    struct TokenOwnership {

        // The address of the owner.

        address addr;

        // Keeps track of the start time of ownership with minimal overhead for tokenomics.

        uint64 startTimestamp;

        // Whether the token has been burned.

        bool burned;

    }



    /**

     * @dev Returns the total amount of tokens stored by the contract.

     *

     * Burned tokens are calculated here, use `_totalMinted()` if you want to count just minted tokens.

     */

    function totalSupply() external view returns (uint256);



    // ==============================

    //            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);



    // ==============================

    //            IERC721

    // ==============================



    /**

     * @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 be have been allowed to move this token by either {approve} or {setApprovalForAll}.

     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.

     *

     * Emits a {Transfer} event.

     */

    function safeTransferFrom(

        address from,

        address to,

        uint256 tokenId

    ) external;



    /**

     * @dev Transfers `tokenId` token from `from` to `to`.

     *

     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.

     *

     * Requirements:

     *

     * - `from` cannot be the zero address.

     * - `to` cannot be the zero address.

     * - `tokenId` token must be owned by `from`.

     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.

     *

     * Emits a {Transfer} event.

     */

    function transferFrom(

        address from,

        address to,

        uint256 tokenId

    ) external;



    /**

     * @dev Gives permission to `to` to transfer `tokenId` token to another account.

     * The approval is cleared when the token is transferred.

     *

     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.

     *

     * Requirements:

     *

     * - The caller must own the token or be an approved operator.

     * - `tokenId` must exist.

     *

     * Emits an {Approval} event.

     */

    function approve(address to, uint256 tokenId) external;



    /**

     * @dev 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);



    // ==============================

    //        IERC721Metadata

    // ==============================



    /**

     * @dev Returns the token collection name.

     */

    function name() external view returns (string memory);



    /**

     * @dev Returns the token collection symbol.

     */

    function symbol() external view returns (string memory);



    /**

     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.

     */

    function tokenURI(uint256 tokenId) external view returns (string memory);

}
// File: ERC721A.sol



// ERC721A Contracts v4.0.0

// Creator: Chiru Labs



pragma solidity ^0.8.4;




/**

 * @dev ERC721 token receiver interface.

 */

interface ERC721A__IERC721Receiver {

    function onERC721Received(

        address operator,

        address from,

        uint256 tokenId,

        bytes calldata data

    ) external returns (bytes4);

}



/**

 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including

 * the Metadata extension. Built to optimize for lower gas during batch mints.

 *

 * Assumes serials are sequentially minted starting at _startTokenId() (defaults to 0, e.g. 0, 1, 2, 3..).

 *

 * Assumes that an owner cannot have more than 2**64 - 1 (max value of uint64) of supply.

 *

 * Assumes that the maximum token id cannot exceed 2**256 - 1 (max value of uint256).

 */

contract ERC721A is IERC721A {

    // Mask of an entry in packed address data.

    uint256 private constant BITMASK_ADDRESS_DATA_ENTRY = (1 << 64) - 1;



    // The bit position of `numberMinted` in packed address data.

    uint256 private constant BITPOS_NUMBER_MINTED = 64;



    // The bit position of `numberBurned` in packed address data.

    uint256 private constant BITPOS_NUMBER_BURNED = 128;



    // The bit position of `aux` in packed address data.

    uint256 private constant BITPOS_AUX = 192;



    // Mask of all 256 bits in packed address data except the 64 bits for `aux`.

    uint256 private constant BITMASK_AUX_COMPLEMENT = (1 << 192) - 1;



    // The bit position of `startTimestamp` in packed ownership.

    uint256 private constant BITPOS_START_TIMESTAMP = 160;



    // The bit mask of the `burned` bit in packed ownership.

    uint256 private constant BITMASK_BURNED = 1 << 224;



    // The bit position of the `nextInitialized` bit in packed ownership.

    uint256 private constant BITPOS_NEXT_INITIALIZED = 225;



    // The bit mask of the `nextInitialized` bit in packed ownership.

    uint256 private constant BITMASK_NEXT_INITIALIZED = 1 << 225;



    // The tokenId of the next token to be minted.

    uint256 private _currentIndex;



    // The number of tokens burned.

    uint256 private _burnCounter;



    // Token name

    string private _name;



    // Token symbol

    string private _symbol;



    // Mapping from token ID to ownership details

    // An empty struct value does not necessarily mean the token is unowned.

    // See `_packedOwnershipOf` implementation for details.

    //

    // Bits Layout:

    // - [0..159]   `addr`

    // - [160..223] `startTimestamp`

    // - [224]      `burned`

    // - [225]      `nextInitialized`

    mapping(uint256 => uint256) private _packedOwnerships;



    // Mapping owner address to address data.

    //

    // Bits Layout:

    // - [0..63]    `balance`

    // - [64..127]  `numberMinted`

    // - [128..191] `numberBurned`

    // - [192..255] `aux`

    mapping(address => uint256) private _packedAddressData;



    // 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;



    constructor(string memory name_, string memory symbol_) {

        _name = name_;

        _symbol = symbol_;

        _currentIndex = _startTokenId();

    }



    /**

     * @dev Returns the starting token ID.

     * To change the starting token ID, please override this function.

     */

    function _startTokenId() internal view virtual returns (uint256) {

        return 0;

    }



    /**

     * @dev Returns the next token ID to be minted.

     */

    function _nextTokenId() internal view returns (uint256) {

        return _currentIndex;

    }



    /**

     * @dev Returns the total number of tokens in existence.

     * Burned tokens will reduce the count.

     * To get the total number of tokens minted, please see `_totalMinted`.

     */

    function totalSupply() public view override returns (uint256) {

        // Counter underflow is impossible as _burnCounter cannot be incremented

        // more than `_currentIndex - _startTokenId()` times.

        unchecked {

            return _currentIndex - _burnCounter - _startTokenId();

        }

    }



    /**

     * @dev Returns the total amount of tokens minted in the contract.

     */

    function _totalMinted() internal view returns (uint256) {

        // Counter underflow is impossible as _currentIndex does not decrement,

        // and it is initialized to `_startTokenId()`

        unchecked {

            return _currentIndex - _startTokenId();

        }

    }



    /**

     * @dev Returns the total number of tokens burned.

     */

    function _totalBurned() internal view returns (uint256) {

        return _burnCounter;

    }



    /**

     * @dev See {IERC165-supportsInterface}.

     */

    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {

        // The interface IDs are constants representing the first 4 bytes of the XOR of

        // all function selectors in the interface. See: https://eips.ethereum.org/EIPS/eip-165

        // e.g. `bytes4(i.functionA.selector ^ i.functionB.selector ^ ...)`

        return

            interfaceId == 0x01ffc9a7 || // ERC165 interface ID for ERC165.

            interfaceId == 0x80ac58cd || // ERC165 interface ID for ERC721.

            interfaceId == 0x5b5e139f; // ERC165 interface ID for ERC721Metadata.

    }



    /**

     * @dev See {IERC721-balanceOf}.

     */

    function balanceOf(address owner) public view override returns (uint256) {

        if (_addressToUint256(owner) == 0) revert BalanceQueryForZeroAddress();

        return _packedAddressData[owner] & BITMASK_ADDRESS_DATA_ENTRY;

    }



    /**

     * Returns the number of tokens minted by `owner`.

     */

    function _numberMinted(address owner) internal view returns (uint256) {

        return (_packedAddressData[owner] >> BITPOS_NUMBER_MINTED) & BITMASK_ADDRESS_DATA_ENTRY;

    }



    /**

     * Returns the number of tokens burned by or on behalf of `owner`.

     */

    function _numberBurned(address owner) internal view returns (uint256) {

        return (_packedAddressData[owner] >> BITPOS_NUMBER_BURNED) & BITMASK_ADDRESS_DATA_ENTRY;

    }



    /**

     * Returns the auxillary data for `owner`. (e.g. number of whitelist mint slots used).

     */

    function _getAux(address owner) internal view returns (uint64) {

        return uint64(_packedAddressData[owner] >> BITPOS_AUX);

    }



    /**

     * Sets the auxillary data for `owner`. (e.g. number of whitelist mint slots used).

     * If there are multiple variables, please pack them into a uint64.

     */

    function _setAux(address owner, uint64 aux) internal {

        uint256 packed = _packedAddressData[owner];

        uint256 auxCasted;

        assembly { // Cast aux without masking.

            auxCasted := aux

        }

        packed = (packed & BITMASK_AUX_COMPLEMENT) | (auxCasted << BITPOS_AUX);

        _packedAddressData[owner] = packed;

    }



    /**

     * Returns the packed ownership data of `tokenId`.

     */

    function _packedOwnershipOf(uint256 tokenId) private view returns (uint256) {

        uint256 curr = tokenId;



        unchecked {

            if (_startTokenId() <= curr)

                if (curr < _currentIndex) {

                    uint256 packed = _packedOwnerships[curr];

                    // If not burned.

                    if (packed & BITMASK_BURNED == 0) {

                        // Invariant:

                        // There will always be an ownership that has an address and is not burned

                        // before an ownership that does not have an address and is not burned.

                        // Hence, curr will not underflow.

                        //

                        // We can directly compare the packed value.

                        // If the address is zero, packed is zero.

                        while (packed == 0) {

                            packed = _packedOwnerships[--curr];

                        }

                        return packed;

                    }

                }

        }

        revert OwnerQueryForNonexistentToken();

    }



    /**

     * Returns the unpacked `TokenOwnership` struct from `packed`.

     */

    function _unpackedOwnership(uint256 packed) private pure returns (TokenOwnership memory ownership) {

        ownership.addr = address(uint160(packed));

        ownership.startTimestamp = uint64(packed >> BITPOS_START_TIMESTAMP);

        ownership.burned = packed & BITMASK_BURNED != 0;

    }



    /**

     * Returns the unpacked `TokenOwnership` struct at `index`.

     */

    function _ownershipAt(uint256 index) internal view returns (TokenOwnership memory) {

        return _unpackedOwnership(_packedOwnerships[index]);

    }



    /**

     * @dev Initializes the ownership slot minted at `index` for efficiency purposes.

     */

    function _initializeOwnershipAt(uint256 index) internal {

        if (_packedOwnerships[index] == 0) {

            _packedOwnerships[index] = _packedOwnershipOf(index);

        }

    }



    /**

     * Gas spent here starts off proportional to the maximum mint batch size.

     * It gradually moves to O(1) as tokens get transferred around in the collection over time.

     */

    function _ownershipOf(uint256 tokenId) internal view returns (TokenOwnership memory) {

        return _unpackedOwnership(_packedOwnershipOf(tokenId));

    }



    /**

     * @dev See {IERC721-ownerOf}.

     */

    function ownerOf(uint256 tokenId) public view override returns (address) {

        return address(uint160(_packedOwnershipOf(tokenId)));

    }



    /**

     * @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) {

        if (!_exists(tokenId)) revert URIQueryForNonexistentToken();



        string memory baseURI = _baseURI();

        return bytes(baseURI).length != 0 ? string(abi.encodePacked(baseURI, _toString(tokenId))) : '';

    }



    /**

     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each

     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty

     * by default, can be overriden in child contracts.

     */

    function _baseURI() internal view virtual returns (string memory) {

        return '';

    }



    /**

     * @dev Casts the address to uint256 without masking.

     */

    function _addressToUint256(address value) private pure returns (uint256 result) {

        assembly {

            result := value

        }

    }



    /**

     * @dev Casts the boolean to uint256 without branching.

     */

    function _boolToUint256(bool value) private pure returns (uint256 result) {

        assembly {

            result := value

        }

    }



    /**

     * @dev See {IERC721-approve}.

     */

    function approve(address to, uint256 tokenId) public virtual override {

        address owner = address(uint160(_packedOwnershipOf(tokenId)));

        if (to == owner) revert ApprovalToCurrentOwner();



        if (_msgSenderERC721A() != owner)

            if (!isApprovedForAll(owner, _msgSenderERC721A())) {

                revert ApprovalCallerNotOwnerNorApproved();

            }



        _tokenApprovals[tokenId] = to;

        emit Approval(owner, to, tokenId);

    }



    /**

     * @dev See {IERC721-getApproved}.

     */

    function getApproved(uint256 tokenId) public view override returns (address) {

        if (!_exists(tokenId)) revert ApprovalQueryForNonexistentToken();



        return _tokenApprovals[tokenId];

    }



    /**

     * @dev See {IERC721-setApprovalForAll}.

     */

    function setApprovalForAll(address operator, bool approved) public virtual override {

        if (operator == _msgSenderERC721A()) revert ApproveToCaller();



        _operatorApprovals[_msgSenderERC721A()][operator] = approved;

        emit ApprovalForAll(_msgSenderERC721A(), 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 {

        _transfer(from, to, tokenId);

    }



    /**

     * @dev See {IERC721-safeTransferFrom}.

     */

    function safeTransferFrom(

        address from,

        address to,

        uint256 tokenId

    ) public virtual override {

        safeTransferFrom(from, to, tokenId, '');

    }



    /**

     * @dev See {IERC721-safeTransferFrom}.

     */

    function safeTransferFrom(

        address from,

        address to,

        uint256 tokenId,

        bytes memory _data

    ) public virtual override {

        _transfer(from, to, tokenId);

        if (to.code.length != 0)

            if (!_checkContractOnERC721Received(from, to, tokenId, _data)) {

                revert TransferToNonERC721ReceiverImplementer();

            }

    }



    /**

     * @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`),

     */

    function _exists(uint256 tokenId) internal view returns (bool) {

        return

            _startTokenId() <= tokenId &&

            tokenId < _currentIndex && // If within bounds,

            _packedOwnerships[tokenId] & BITMASK_BURNED == 0; // and not burned.

    }



    /**

     * @dev Equivalent to `_safeMint(to, quantity, '')`.

     */

    function _safeMint(address to, uint256 quantity) internal {

        _safeMint(to, quantity, '');

    }



    /**

     * @dev Safely mints `quantity` tokens and transfers them to `to`.

     *

     * Requirements:

     *

     * - If `to` refers to a smart contract, it must implement

     *   {IERC721Receiver-onERC721Received}, which is called for each safe transfer.

     * - `quantity` must be greater than 0.

     *

     * Emits a {Transfer} event.

     */

    function _safeMint(

        address to,

        uint256 quantity,

        bytes memory _data

    ) internal {

        uint256 startTokenId = _currentIndex;

        if (_addressToUint256(to) == 0) revert MintToZeroAddress();

        if (quantity == 0) revert MintZeroQuantity();



        _beforeTokenTransfers(address(0), to, startTokenId, quantity);



        // Overflows are incredibly unrealistic.

        // balance or numberMinted overflow if current value of either + quantity > 1.8e19 (2**64) - 1

        // updatedIndex overflows if _currentIndex + quantity > 1.2e77 (2**256) - 1

        unchecked {

            // Updates:

            // - `balance += quantity`.

            // - `numberMinted += quantity`.

            //

            // We can directly add to the balance and number minted.

            _packedAddressData[to] += quantity * ((1 << BITPOS_NUMBER_MINTED) | 1);



            // Updates:

            // - `address` to the owner.

            // - `startTimestamp` to the timestamp of minting.

            // - `burned` to `false`.

            // - `nextInitialized` to `quantity == 1`.

            _packedOwnerships[startTokenId] =

                _addressToUint256(to) |

                (block.timestamp << BITPOS_START_TIMESTAMP) |

                (_boolToUint256(quantity == 1) << BITPOS_NEXT_INITIALIZED);



            uint256 updatedIndex = startTokenId;

            uint256 end = updatedIndex + quantity;



            if (to.code.length != 0) {

                do {

                    emit Transfer(address(0), to, updatedIndex);

                    if (!_checkContractOnERC721Received(address(0), to, updatedIndex++, _data)) {

                        revert TransferToNonERC721ReceiverImplementer();

                    }

                } while (updatedIndex < end);

                // Reentrancy protection

                if (_currentIndex != startTokenId) revert();

            } else {

                do {

                    emit Transfer(address(0), to, updatedIndex++);

                } while (updatedIndex < end);

            }

            _currentIndex = updatedIndex;

        }

        _afterTokenTransfers(address(0), to, startTokenId, quantity);

    }



    /**

     * @dev Mints `quantity` tokens and transfers them to `to`.

     *

     * Requirements:

     *

     * - `to` cannot be the zero address.

     * - `quantity` must be greater than 0.

     *

     * Emits a {Transfer} event.

     */

    function _mint(address to, uint256 quantity) internal {

        uint256 startTokenId = _currentIndex;

        if (_addressToUint256(to) == 0) revert MintToZeroAddress();

        if (quantity == 0) revert MintZeroQuantity();



        _beforeTokenTransfers(address(0), to, startTokenId, quantity);



        // Overflows are incredibly unrealistic.

        // balance or numberMinted overflow if current value of either + quantity > 1.8e19 (2**64) - 1

        // updatedIndex overflows if _currentIndex + quantity > 1.2e77 (2**256) - 1

        unchecked {

            // Updates:

            // - `balance += quantity`.

            // - `numberMinted += quantity`.

            //

            // We can directly add to the balance and number minted.

            _packedAddressData[to] += quantity * ((1 << BITPOS_NUMBER_MINTED) | 1);



            // Updates:

            // - `address` to the owner.

            // - `startTimestamp` to the timestamp of minting.

            // - `burned` to `false`.

            // - `nextInitialized` to `quantity == 1`.

            _packedOwnerships[startTokenId] =

                _addressToUint256(to) |

                (block.timestamp << BITPOS_START_TIMESTAMP) |

                (_boolToUint256(quantity == 1) << BITPOS_NEXT_INITIALIZED);



            uint256 updatedIndex = startTokenId;

            uint256 end = updatedIndex + quantity;



            do {

                emit Transfer(address(0), to, updatedIndex++);

            } while (updatedIndex < end);



            _currentIndex = updatedIndex;

        }

        _afterTokenTransfers(address(0), to, startTokenId, quantity);

    }



    /**

     * @dev Transfers `tokenId` from `from` to `to`.

     *

     * 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

    ) private {

        uint256 prevOwnershipPacked = _packedOwnershipOf(tokenId);



        if (address(uint160(prevOwnershipPacked)) != from) revert TransferFromIncorrectOwner();



        address approvedAddress = _tokenApprovals[tokenId];



        bool isApprovedOrOwner = (_msgSenderERC721A() == from ||

            isApprovedForAll(from, _msgSenderERC721A()) ||

            approvedAddress == _msgSenderERC721A());



        if (!isApprovedOrOwner) revert TransferCallerNotOwnerNorApproved();

        if (_addressToUint256(to) == 0) revert TransferToZeroAddress();



        _beforeTokenTransfers(from, to, tokenId, 1);



        // Clear approvals from the previous owner.

        if (_addressToUint256(approvedAddress) != 0) {

            delete _tokenApprovals[tokenId];

        }



        // Underflow of the sender's balance is impossible because we check for

        // ownership above and the recipient's balance can't realistically overflow.

        // Counter overflow is incredibly unrealistic as tokenId would have to be 2**256.

        unchecked {

            // We can directly increment and decrement the balances.

            --_packedAddressData[from]; // Updates: `balance -= 1`.

            ++_packedAddressData[to]; // Updates: `balance += 1`.



            // Updates:

            // - `address` to the next owner.

            // - `startTimestamp` to the timestamp of transfering.

            // - `burned` to `false`.

            // - `nextInitialized` to `true`.

            _packedOwnerships[tokenId] =

                _addressToUint256(to) |

                (block.timestamp << BITPOS_START_TIMESTAMP) |

                BITMASK_NEXT_INITIALIZED;



            // If the next slot may not have been initialized (i.e. `nextInitialized == false`) .

            if (prevOwnershipPacked & BITMASK_NEXT_INITIALIZED == 0) {

                uint256 nextTokenId = tokenId + 1;

                // If the next slot's address is zero and not burned (i.e. packed value is zero).

                if (_packedOwnerships[nextTokenId] == 0) {

                    // If the next slot is within bounds.

                    if (nextTokenId != _currentIndex) {

                        // Initialize the next slot to maintain correctness for `ownerOf(tokenId + 1)`.

                        _packedOwnerships[nextTokenId] = prevOwnershipPacked;

                    }

                }

            }

        }



        emit Transfer(from, to, tokenId);

        _afterTokenTransfers(from, to, tokenId, 1);

    }



    /**

     * @dev Equivalent to `_burn(tokenId, false)`.

     */

    function _burn(uint256 tokenId) internal virtual {

        _burn(tokenId, false);

    }



    /**

     * @dev Destroys `tokenId`.

     * The approval is cleared when the token is burned.

     *

     * Requirements:

     *

     * - `tokenId` must exist.

     *

     * Emits a {Transfer} event.

     */

    function _burn(uint256 tokenId, bool approvalCheck) internal virtual {

        uint256 prevOwnershipPacked = _packedOwnershipOf(tokenId);



        address from = address(uint160(prevOwnershipPacked));

        address approvedAddress = _tokenApprovals[tokenId];



        if (approvalCheck) {

            bool isApprovedOrOwner = (_msgSenderERC721A() == from ||

                isApprovedForAll(from, _msgSenderERC721A()) ||

                approvedAddress == _msgSenderERC721A());



            if (!isApprovedOrOwner) revert TransferCallerNotOwnerNorApproved();

        }



        _beforeTokenTransfers(from, address(0), tokenId, 1);



        // Clear approvals from the previous owner.

        if (_addressToUint256(approvedAddress) != 0) {

            delete _tokenApprovals[tokenId];

        }



        // Underflow of the sender's balance is impossible because we check for

        // ownership above and the recipient's balance can't realistically overflow.

        // Counter overflow is incredibly unrealistic as tokenId would have to be 2**256.

        unchecked {

            // Updates:

            // - `balance -= 1`.

            // - `numberBurned += 1`.

            //

            // We can directly decrement the balance, and increment the number burned.

            // This is equivalent to `packed -= 1; packed += 1 << BITPOS_NUMBER_BURNED;`.

            _packedAddressData[from] += (1 << BITPOS_NUMBER_BURNED) - 1;



            // Updates:

            // - `address` to the last owner.

            // - `startTimestamp` to the timestamp of burning.

            // - `burned` to `true`.

            // - `nextInitialized` to `true`.

            _packedOwnerships[tokenId] =

                _addressToUint256(from) |

                (block.timestamp << BITPOS_START_TIMESTAMP) |

                BITMASK_BURNED |

                BITMASK_NEXT_INITIALIZED;



            // If the next slot may not have been initialized (i.e. `nextInitialized == false`) .

            if (prevOwnershipPacked & BITMASK_NEXT_INITIALIZED == 0) {

                uint256 nextTokenId = tokenId + 1;

                // If the next slot's address is zero and not burned (i.e. packed value is zero).

                if (_packedOwnerships[nextTokenId] == 0) {

                    // If the next slot is within bounds.

                    if (nextTokenId != _currentIndex) {

                        // Initialize the next slot to maintain correctness for `ownerOf(tokenId + 1)`.

                        _packedOwnerships[nextTokenId] = prevOwnershipPacked;

                    }

                }

            }

        }



        emit Transfer(from, address(0), tokenId);

        _afterTokenTransfers(from, address(0), tokenId, 1);



        // Overflow not possible, as _burnCounter cannot be exceed _currentIndex times.

        unchecked {

            _burnCounter++;

        }

    }



    /**

     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target 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 _checkContractOnERC721Received(

        address from,

        address to,

        uint256 tokenId,

        bytes memory _data

    ) private returns (bool) {

        try ERC721A__IERC721Receiver(to).onERC721Received(_msgSenderERC721A(), from, tokenId, _data) returns (

            bytes4 retval

        ) {

            return retval == ERC721A__IERC721Receiver(to).onERC721Received.selector;

        } catch (bytes memory reason) {

            if (reason.length == 0) {

                revert TransferToNonERC721ReceiverImplementer();

            } else {

                assembly {

                    revert(add(32, reason), mload(reason))

                }

            }

        }

    }



    /**

     * @dev Hook that is called before a set of serially-ordered token ids are about to be transferred. This includes minting.

     * And also called before burning one token.

     *

     * startTokenId - the first token id to be transferred

     * quantity - the amount to be transferred

     *

     * 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, `tokenId` will be burned by `from`.

     * - `from` and `to` are never both zero.

     */

    function _beforeTokenTransfers(

        address from,

        address to,

        uint256 startTokenId,

        uint256 quantity

    ) internal virtual {}



    /**

     * @dev Hook that is called after a set of serially-ordered token ids have been transferred. This includes

     * minting.

     * And also called after one token has been burned.

     *

     * startTokenId - the first token id to be transferred

     * quantity - the amount to be transferred

     *

     * Calling conditions:

     *

     * - When `from` and `to` are both non-zero, `from`'s `tokenId` has been

     * transferred to `to`.

     * - When `from` is zero, `tokenId` has been minted for `to`.

     * - When `to` is zero, `tokenId` has been burned by `from`.

     * - `from` and `to` are never both zero.

     */

    function _afterTokenTransfers(

        address from,

        address to,

        uint256 startTokenId,

        uint256 quantity

    ) internal virtual {}



    /**

     * @dev Returns the message sender (defaults to `msg.sender`).

     *

     * If you are writing GSN compatible contracts, you need to override this function.

     */

    function _msgSenderERC721A() internal view virtual returns (address) {

        return msg.sender;

    }



    /**

     * @dev Converts a `uint256` to its ASCII `string` decimal representation.

     */

    function _toString(uint256 value) internal pure returns (string memory ptr) {

        assembly {

            // The maximum value of a uint256 contains 78 digits (1 byte per digit),

            // but we allocate 128 bytes to keep the free memory pointer 32-byte word aliged.

            // We will need 1 32-byte word to store the length,

            // and 3 32-byte words to store a maximum of 78 digits. Total: 32 + 3 * 32 = 128.

            ptr := add(mload(0x40), 128)

            // Update the free memory pointer to allocate.

            mstore(0x40, ptr)



            // Cache the end of the memory to calculate the length later.

            let end := ptr



            // We write the string from the rightmost digit to the leftmost digit.

            // The following is essentially a do-while loop that also handles the zero case.

            // Costs a bit more than early returning for the zero case,

            // but cheaper in terms of deployment and overall runtime costs.

            for {

                // Initialize and perform the first pass without check.

                let temp := value

                // Move the pointer 1 byte leftwards to point to an empty character slot.

                ptr := sub(ptr, 1)

                // Write the character to the pointer. 48 is the ASCII index of '0'.

                mstore8(ptr, add(48, mod(temp, 10)))

                temp := div(temp, 10)

            } temp {

                // Keep dividing `temp` until zero.

                temp := div(temp, 10)

            } { // Body of the for loop.

                ptr := sub(ptr, 1)

                mstore8(ptr, add(48, mod(temp, 10)))

            }



            let length := sub(end, ptr)

            // Move the pointer 32 bytes leftwards to make room for the length.

            ptr := sub(ptr, 32)

            // Store the length.

            mstore(ptr, length)

        }

    }

}
// File: ERC721AURIStorage.sol



// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/extensions/ERC721URIStorage.sol)



pragma solidity ^0.8.0;





/**

 * @dev ERC721 token with storage based token URI management.

 */

abstract contract ERC721AURIStorage is ERC721A {

    using Strings for uint256;



    // Optional mapping for token URIs

    mapping(uint256 => string) private _tokenURIs;



    /**

     * @dev See {IERC721Metadata-tokenURI}.

     */

    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {

        _exists(tokenId);



        string memory _tokenURI = _tokenURIs[tokenId];

        string memory base = _baseURI();



        // If there is no base URI, return the token URI.

        if (bytes(base).length == 0 || bytes(_tokenURI).length > 0) {

            return _tokenURI;

        }



        // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).

        /*

        if (bytes(_tokenURI).length > 0) {

            return string(abi.encodePacked(base, _tokenURI));

        }

        */



        return super.tokenURI(tokenId);

    }



    /**

     * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.

     *

     * Requirements:

     *

     * - `tokenId` must exist.

     */

    function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {

        require(_exists(tokenId), "ERC721AURIStorage: URI set of nonexistent token");



        if (bytes(_tokenURI).length > 0)

        {

            _tokenURIs[tokenId] = _tokenURI;

        }

        else

        {

            delete _tokenURIs[tokenId];

        }

    }



    /**

     * @dev See {ERC721-_burn}. This override additionally checks to see if a

     * token-specific URI was set for the token, and if so, it deletes the token URI from

     * the storage mapping.

     */

    function _burn(uint256 tokenId) internal virtual override {

        super._burn(tokenId);



        if (bytes(_tokenURIs[tokenId]).length != 0) {

            delete _tokenURIs[tokenId];

        }

    }

}
// File: ReentrancyGuard.sol



// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)



pragma solidity ^0.8.0;



/**

 * @dev Contract module that helps prevent reentrant calls to a function.

 *

 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier

 * available, which can be applied to functions to make sure there are no nested

 * (reentrant) calls to them.

 *

 * Note that because there is a single `nonReentrant` guard, functions marked as

 * `nonReentrant` may not call one another. This can be worked around by making

 * those functions `private`, and then adding `external` `nonReentrant` entry

 * points to them.

 *

 * TIP: If you would like to learn more about reentrancy and alternative ways

 * to protect against it, check out our blog post

 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].

 */

abstract contract ReentrancyGuard {

    // Booleans are more expensive than uint256 or any type that takes up a full

    // word because each write operation emits an extra SLOAD to first read the

    // slot's contents, replace the bits taken up by the boolean, and then write

    // back. This is the compiler's defense against contract upgrades and

    // pointer aliasing, and it cannot be disabled.



    // The values being non-zero value makes deployment a bit more expensive,

    // but in exchange the refund on every call to nonReentrant will be lower in

    // amount. Since refunds are capped to a percentage of the total

    // transaction's gas, it is best to keep them low in cases like this one, to

    // increase the likelihood of the full refund coming into effect.

    uint256 private constant _NOT_ENTERED = 1;

    uint256 private constant _ENTERED = 2;



    uint256 private _status;



    constructor() {

        _status = _NOT_ENTERED;

    }



    /**

     * @dev Prevents a contract from calling itself, directly or indirectly.

     * Calling a `nonReentrant` function from another `nonReentrant`

     * function is not supported. It is possible to prevent this from happening

     * by making the `nonReentrant` function external, and making it call a

     * `private` function that does the actual work.

     */

    modifier nonReentrant() {

        // On the first call to nonReentrant, _notEntered will be true

        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");



        // Any calls to nonReentrant after this point will fail

        _status = _ENTERED;



        _;



        // By storing the original value once again, a refund is triggered (see

        // https://eips.ethereum.org/EIPS/eip-2200)

        _status = _NOT_ENTERED;

    }

}
// File: Context.sol



// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)



pragma solidity ^0.8.0;



/**

 * @dev Provides information about the current execution context, including the

 * sender of the transaction and its data. While these are generally available

 * via msg.sender and msg.data, they should not be accessed in such a direct

 * manner, since when dealing with meta-transactions the account sending and

 * paying for execution may not be the actual sender (as far as an application

 * is concerned).

 *

 * This contract is only required for intermediate, library-like contracts.

 */

abstract contract Context {

    function _msgSender() internal view virtual returns (address) {

        return msg.sender;

    }



    function _msgData() internal view virtual returns (bytes calldata) {

        return msg.data;

    }

}
// File: Ownable.sol



// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)



pragma solidity ^0.8.0;




/**

 * @dev Contract module which provides a basic access control mechanism, where

 * there is an account (an owner) that can be granted exclusive access to

 * specific functions.

 *

 * By default, the owner account will be the one that deploys the contract. This

 * can later be changed with {transferOwnership}.

 *

 * This module is used through inheritance. It will make available the modifier

 * `onlyOwner`, which can be applied to your functions to restrict their use to

 * the owner.

 */

abstract contract Ownable is Context {

    address private _owner;



    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);



    /**

     * @dev Initializes the contract setting the deployer as the initial owner.

     */

    constructor() {

        _transferOwnership(_msgSender());

    }



    /**

     * @dev Returns the address of the current owner.

     */

    function owner() public view virtual returns (address) {

        return _owner;

    }



    /**

     * @dev Throws if called by any account other than the owner.

     */

    modifier onlyOwner() {

        require(owner() == _msgSender(), "Ownable: caller is not the owner");

        _;

    }



    /**

     * @dev Leaves the contract without owner. It will not be possible to call

     * `onlyOwner` functions anymore. Can only be called by the current owner.

     *

     * NOTE: Renouncing ownership will leave the contract without an owner,

     * thereby removing any functionality that is only available to the owner.

     */

    function renounceOwnership() public virtual onlyOwner {

        _transferOwnership(address(0));

    }



    /**

     * @dev Transfers ownership of the contract to a new account (`newOwner`).

     * Can only be called by the current owner.

     */

    function transferOwnership(address newOwner) public virtual onlyOwner {

        require(newOwner != address(0), "Ownable: new owner is the zero address");

        _transferOwnership(newOwner);

    }



    /**

     * @dev Transfers ownership of the contract to a new account (`newOwner`).

     * Internal function without access restriction.

     */

    function _transferOwnership(address newOwner) internal virtual {

        address oldOwner = _owner;

        _owner = newOwner;

        emit OwnershipTransferred(oldOwner, newOwner);

    }

}
// File: contrato.sol



pragma solidity ^0.8.4;




//import "./ERC721AQueryable.sol";





contract EVENFT is ERC721AURIStorage, DefaultOperatorFilterer, Ownable, ReentrancyGuard {



    // This sets the name and symbol of our NFT contract when it is created.

    constructor() ERC721A("Project EVE NFT", "EVENFT") {}



    /**

    Este é o máximo de itens disponível na coleção como um todo.

    Ele pode ser alterado através de "updateMaxMintsAvailable"

    Inclui todas as fases de mintagem (pré-venda e venda pública)

     */

    uint public MaxMintsAvailable = 400;



    function updateMaxMintsAvailable(uint64 _NewMaxMintsAvailable) external onlyOwner {

        require(_NewMaxMintsAvailable >= totalSupply(), "Must be greaters than current supply");

        MaxMintsAvailable = _NewMaxMintsAvailable;

    }



    uint public limitPerWallet = 999;



    function updateLimitPerWallet(uint128 _newLimit) external onlyOwner

    {

        limitPerWallet = _newLimit;

        return;

    }



    uint128 public mintPrice = 0.08 ether;



    function updateMintPrice (uint128 _newPrice) external onlyOwner {

        mintPrice = _newPrice;

    }

   

    /**

    Este é o flag indicativo de se o mint está publicamente disponível (true)

    Ele pode ser alterado em "setPublicMintStage"

    O drop não é afetado por esse flag.

     */



    bool public publicMintActive = false;



    function setPublicMintActive(bool newState) external onlyOwner returns (bool) {

        publicMintActive = newState;

        return publicMintActive;

    }



    /**

    Este é o endereço base do arquivo de metadados correspondente a cada um dos tokens

    Ele pode ser alterado em "setBaseURI"

     */



    string private _baseTokenURI;



    function _baseURI() internal view virtual override returns (string memory) {

        return _baseTokenURI;

    }



    function setBaseURI(string calldata baseURI) external onlyOwner {

        _baseTokenURI = baseURI;

    }



    function setTokenURI(uint256 tokenId, string memory _tokenURI) external onlyOwner

    {

        _setTokenURI(tokenId, _tokenURI);

        return;

    }



    /**

    Este é o tamanho máximo do lote por transação. O limite tem que ser necessáriamente menor que o limite por carteira.

    Ele pode ser alterado em setMaximumMintsPerTransaction

     */



    uint private maxMintsPerTransaction = 100;



    function maximumMintsPerTransaction() public view returns (uint)

    {

        return maxMintsPerTransaction;

    }

    

    function setMaximumMintsPerTransaction(uint _newMaximum) external onlyOwner {

        require(_newMaximum <= limitPerWallet, "Greater than address limit");

        require(_newMaximum > 0, "Must be larger than 0");



        maxMintsPerTransaction = _newMaximum;

    }



    /**

    Cunhagem em lote (implícita ao requisitante)

     */



    function batchMint(uint _batchSize) external payable {

        publicMintValidation(msg.sender, _batchSize);



        // Todos os requisitos satisfeitos, cunhar.

        _mint(msg.sender,_batchSize);

    }



    /**

    Cunhagem a terceiros.

     */

    function mintTo(address _mintToAddress, uint128 _batchSize) external payable

    {

        publicMintValidation(_mintToAddress, _batchSize);



        // Todos os requisitor satisfeitos, cunhar.

        _mint(_mintToAddress,_batchSize);

    }



    /**

    Validações comuns aos processos de cunhagem públicos

     */

    function publicMintValidation(address toAddress, uint _batchSize) internal {

        uint256 total_supply = totalSupply();



        // Suprimento está disponível?

        require((total_supply + _batchSize) <= MaxMintsAvailable, "Not enough Tokens left");



        // Menor lote possível é 1

        require(_batchSize > 0, "Must be at least One");



        // Maior lote possível é o da configuração

        require(_batchSize <= maxMintsPerTransaction, "Maximum per Transaction is exceeded.");



        // Mintagem deve estar aberta

        require(publicMintActive, "Public Mint not active");



        // Carteira não pode já conter mais tokens que o máximo permitido

        require(

            (balanceOf(toAddress) + _batchSize) <= limitPerWallet,

            "Address Limit Exceeded"

        );



        // Valor pago deve ser suficiente para todos os tokens!

        uint256 batchPrice = mintPrice * _batchSize;



        require(

            msg.value == batchPrice,

            "Wrong Batch Price"

        );



        return;

    }



    /**

    Cunhagem especial para o dono do contrato custa apenas a taxa de Gas

    Pode ser usada para fazer um drop "caro" de novos tokens

     */

    function batchOwnerMintTo(address toAddress, uint _batchSize) external onlyOwner {

        // A única validação que existe neste caso é se existem tokens disponíveis

        // Suprimento está disponível?

        require((totalSupply() + _batchSize) <= MaxMintsAvailable, "Not enough Tokens");



        _mint(toAddress, _batchSize);

    }



    /**

    Saque de fundos do contrato para uma carteira específica.

     */



    function withdrawContract(address payable _to, uint256 _amount) public nonReentrant onlyOwner

    {

        (bool sent, bytes memory data) = _to.call{value: _amount}("");

        require(sent, "Failed to send ETH");

    }



    function burn(uint256 tokenId) external {

        _burn(tokenId, true);

    }



    /*

    Overrides requeridos pelo filtro de operadores

    */



    function setApprovalForAll(address operator, bool approved) public override onlyAllowedOperatorApproval(operator) {

        super.setApprovalForAll(operator, approved);

    }



    function approve(address operator, uint256 tokenId) public override onlyAllowedOperatorApproval(operator) {

        super.approve(operator, tokenId);

    }



    function transferFrom(address from, address to, uint256 tokenId) public override onlyAllowedOperator(from) {

        super.transferFrom(from, to, tokenId);

    }



    function safeTransferFrom(address from, address to, uint256 tokenId) public override onlyAllowedOperator(from) {

        super.safeTransferFrom(from, to, tokenId);

    }



    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data)

        public

        override

        onlyAllowedOperator(from)

    {

        super.safeTransferFrom(from, to, tokenId, data);

    }

}