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

pragma solidity ^0.8.0;

import "../utils/Context.sol";

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

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

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

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

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

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

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

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

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

// 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;
    }
}

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

pragma solidity ^0.8.0;

import "../Strings.sol";

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV // Deprecated in v4.8
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            /// @solidity memory-safe-assembly
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        uint8 v = uint8((uint256(vs) >> 255) + 27);
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

// 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);
        }
    }
}

// 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);
    }
}

// SPDX-License-Identifier: MIT
// ERC721A Contracts v4.2.0
// Creator: Chiru Labs

pragma solidity ^0.8.4;

import "./IERC721A.sol";

/**
 * @dev Interface of ERC721 token receiver.
 */
interface ERC721A__IERC721Receiver {
	function onERC721Received(
		address operator,
		address from,
		uint256 tokenId,
		bytes calldata data
	) external returns (bytes4);
}

/**
 * @title ERC721A
 *
 * @dev Implementation of the [ERC721](https://eips.ethereum.org/EIPS/eip-721)
 * Non-Fungible Token Standard, including the Metadata extension.
 * Optimized for lower gas during batch mints.
 *
 * Token IDs are minted in sequential order (e.g. 0, 1, 2, 3, ...)
 * starting from `_startTokenId()`.
 *
 * Assumptions:
 *
 * - An owner cannot have more than 2**64 - 1 (max value of uint64) of supply.
 * - The maximum token ID cannot exceed 2**256 - 1 (max value of uint256).
 */
contract ERC721A is IERC721A {
	// Reference type for token approval.
	struct TokenApprovalRef {
		address value;
	}

	// =============================================================
	//                           CONSTANTS
	// =============================================================

	// 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 bit position of `extraData` in packed ownership.
	uint256 private constant _BITPOS_EXTRA_DATA = 232;

	// Mask of all 256 bits in a packed ownership except the 24 bits for `extraData`.
	uint256 private constant _BITMASK_EXTRA_DATA_COMPLEMENT = (1 << 232) - 1;

	// The mask of the lower 160 bits for addresses.
	uint256 private constant _BITMASK_ADDRESS = (1 << 160) - 1;

	// The maximum `quantity` that can be minted with {_mintERC2309}.
	// This limit is to prevent overflows on the address data entries.
	// For a limit of 5000, a total of 3.689e15 calls to {_mintERC2309}
	// is required to cause an overflow, which is unrealistic.
	uint256 private constant _MAX_MINT_ERC2309_QUANTITY_LIMIT = 5000;

	// The `Transfer` event signature is given by:
	// `keccak256(bytes("Transfer(address,address,uint256)"))`.
	bytes32 private constant _TRANSFER_EVENT_SIGNATURE =
		0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef;

	// =============================================================
	//                            STORAGE
	// =============================================================

	// The next token ID 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`
	// - [232..255] `extraData`
	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 => TokenApprovalRef) private _tokenApprovals;

	// Mapping from owner to operator approvals
	mapping(address => mapping(address => bool)) private _operatorApprovals;

	// =============================================================
	//                          CONSTRUCTOR
	// =============================================================

	constructor(string memory name_, string memory symbol_) {
		_name = name_;
		_symbol = symbol_;
		_currentIndex = _startTokenId();
	}

	// =============================================================
	//                   TOKEN COUNTING OPERATIONS
	// =============================================================

	/**
	 * @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 virtual 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 virtual 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 virtual 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 virtual returns (uint256) {
		return _burnCounter;
	}

	// =============================================================
	//                    ADDRESS DATA OPERATIONS
	// =============================================================

	/**
	 * @dev Returns the number of tokens in `owner`'s account.
	 */
	function balanceOf(address owner) public view virtual override returns (uint256) {
		if (owner == address(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 auxiliary 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 auxiliary 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 virtual {
		uint256 packed = _packedAddressData[owner];
		uint256 auxCasted;
		// Cast `aux` with assembly to avoid redundant masking.
		assembly {
			auxCasted := aux
		}
		packed = (packed & _BITMASK_AUX_COMPLEMENT) | (auxCasted << _BITPOS_AUX);
		_packedAddressData[owner] = packed;
	}

	// =============================================================
	//                            IERC165
	// =============================================================

	/**
	 * @dev Returns true if this contract implements the interface defined by
	 * `interfaceId`. See the corresponding
	 * [EIP section](https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified)
	 * to learn more about how these ids are created.
	 *
	 * This function call must use less than 30000 gas.
	 */
	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: [ERC165](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.
	}

	// =============================================================
	//                        IERC721Metadata
	// =============================================================

	/**
	 * @dev Returns the token collection name.
	 */
	function name() public view virtual override returns (string memory) {
		return _name;
	}

	/**
	 * @dev Returns the token collection symbol.
	 */
	function symbol() public view virtual override returns (string memory) {
		return _symbol;
	}

	/**
	 * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
	 */
	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, it can be overridden in child contracts.
	 */
	function _baseURI() internal view virtual returns (string memory) {
		return "";
	}

	// =============================================================
	//                     OWNERSHIPS OPERATIONS
	// =============================================================

	/**
	 * @dev Returns the owner of the `tokenId` token.
	 *
	 * Requirements:
	 *
	 * - `tokenId` must exist.
	 */
	function ownerOf(uint256 tokenId) public view virtual override returns (address) {
		return address(uint160(_packedOwnershipOf(tokenId)));
	}

	/**
	 * @dev Gas spent here starts off proportional to the maximum mint batch size.
	 * It gradually moves to O(1) as tokens get transferred around over time.
	 */
	function _ownershipOf(uint256 tokenId) internal view virtual returns (TokenOwnership memory) {
		return _unpackedOwnership(_packedOwnershipOf(tokenId));
	}

	/**
	 * @dev Returns the unpacked `TokenOwnership` struct at `index`.
	 */
	function _ownershipAt(uint256 index) internal view virtual returns (TokenOwnership memory) {
		return _unpackedOwnership(_packedOwnerships[index]);
	}

	/**
	 * @dev Initializes the ownership slot minted at `index` for efficiency purposes.
	 */
	function _initializeOwnershipAt(uint256 index) internal virtual {
		if (_packedOwnerships[index] == 0) {
			_packedOwnerships[index] = _packedOwnershipOf(index);
		}
	}

	/**
	 * 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 initialized ownership slot
						// (i.e. `ownership.addr != address(0) && ownership.burned == false`)
						// before an unintialized ownership slot
						// (i.e. `ownership.addr == address(0) && ownership.burned == false`)
						// Hence, `curr` will not underflow.
						//
						// We can directly compare the packed value.
						// If the address is zero, packed will be zero.
						while (packed == 0) {
							packed = _packedOwnerships[--curr];
						}
						return packed;
					}
				}
		}
		revert OwnerQueryForNonexistentToken();
	}

	/**
	 * @dev 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;
		ownership.extraData = uint24(packed >> _BITPOS_EXTRA_DATA);
	}

	/**
	 * @dev Packs ownership data into a single uint256.
	 */
	function _packOwnershipData(
		address owner,
		uint256 flags
	) private view returns (uint256 result) {
		assembly {
			// Mask `owner` to the lower 160 bits, in case the upper bits somehow aren't clean.
			owner := and(owner, _BITMASK_ADDRESS)
			// `owner | (block.timestamp << _BITPOS_START_TIMESTAMP) | flags`.
			result := or(owner, or(shl(_BITPOS_START_TIMESTAMP, timestamp()), flags))
		}
	}

	/**
	 * @dev Returns the `nextInitialized` flag set if `quantity` equals 1.
	 */
	function _nextInitializedFlag(uint256 quantity) private pure returns (uint256 result) {
		// For branchless setting of the `nextInitialized` flag.
		assembly {
			// `(quantity == 1) << _BITPOS_NEXT_INITIALIZED`.
			result := shl(_BITPOS_NEXT_INITIALIZED, eq(quantity, 1))
		}
	}

	// =============================================================
	//                      APPROVAL OPERATIONS
	// =============================================================

	/**
	 * @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) public virtual override {
		address owner = ownerOf(tokenId);

		if (_msgSenderERC721A() != owner)
			if (!isApprovedForAll(owner, _msgSenderERC721A())) {
				revert ApprovalCallerNotOwnerNorApproved();
			}

		_tokenApprovals[tokenId].value = to;
		emit Approval(owner, to, tokenId);
	}

	/**
	 * @dev Returns the account approved for `tokenId` token.
	 *
	 * Requirements:
	 *
	 * - `tokenId` must exist.
	 */
	function getApproved(uint256 tokenId) public view virtual override returns (address) {
		if (!_exists(tokenId)) revert ApprovalQueryForNonexistentToken();

		return _tokenApprovals[tokenId].value;
	}

	/**
	 * @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) public virtual override {
		if (operator == _msgSenderERC721A()) revert ApproveToCaller();

		_operatorApprovals[_msgSenderERC721A()][operator] = approved;
		emit ApprovalForAll(_msgSenderERC721A(), operator, approved);
	}

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

	/**
	 * @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. See {_mint}.
	 */
	function _exists(uint256 tokenId) internal view virtual returns (bool) {
		return
			_startTokenId() <= tokenId &&
			tokenId < _currentIndex && // If within bounds,
			_packedOwnerships[tokenId] & _BITMASK_BURNED == 0; // and not burned.
	}

	/**
	 * @dev Returns whether `msgSender` is equal to `approvedAddress` or `owner`.
	 */
	function _isSenderApprovedOrOwner(
		address approvedAddress,
		address owner,
		address msgSender
	) private pure returns (bool result) {
		assembly {
			// Mask `owner` to the lower 160 bits, in case the upper bits somehow aren't clean.
			owner := and(owner, _BITMASK_ADDRESS)
			// Mask `msgSender` to the lower 160 bits, in case the upper bits somehow aren't clean.
			msgSender := and(msgSender, _BITMASK_ADDRESS)
			// `msgSender == owner || msgSender == approvedAddress`.
			result := or(eq(msgSender, owner), eq(msgSender, approvedAddress))
		}
	}

	/**
	 * @dev Returns the storage slot and value for the approved address of `tokenId`.
	 */
	function _getApprovedSlotAndAddress(
		uint256 tokenId
	) private view returns (uint256 approvedAddressSlot, address approvedAddress) {
		TokenApprovalRef storage tokenApproval = _tokenApprovals[tokenId];
		// The following is equivalent to `approvedAddress = _tokenApprovals[tokenId]`.
		assembly {
			approvedAddressSlot := tokenApproval.slot
			approvedAddress := sload(approvedAddressSlot)
		}
	}

	// =============================================================
	//                      TRANSFER OPERATIONS
	// =============================================================

	/**
	 * @dev Transfers `tokenId` from `from` to `to`.
	 *
	 * 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) public virtual override {
		uint256 prevOwnershipPacked = _packedOwnershipOf(tokenId);

		if (address(uint160(prevOwnershipPacked)) != from) revert TransferFromIncorrectOwner();

		(uint256 approvedAddressSlot, address approvedAddress) = _getApprovedSlotAndAddress(
			tokenId
		);

		// The nested ifs save around 20+ gas over a compound boolean condition.
		if (!_isSenderApprovedOrOwner(approvedAddress, from, _msgSenderERC721A()))
			if (!isApprovedForAll(from, _msgSenderERC721A()))
				revert TransferCallerNotOwnerNorApproved();

		if (to == address(0)) revert TransferToZeroAddress();

		_beforeTokenTransfers(from, to, tokenId, 1);

		// Clear approvals from the previous owner.
		assembly {
			if approvedAddress {
				// This is equivalent to `delete _tokenApprovals[tokenId]`.
				sstore(approvedAddressSlot, 0)
			}
		}

		// 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] = _packOwnershipData(
				to,
				_BITMASK_NEXT_INITIALIZED | _nextExtraData(from, to, prevOwnershipPacked)
			);

			// 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 `safeTransferFrom(from, to, tokenId, '')`.
	 */
	function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override {
		safeTransferFrom(from, to, tokenId, "");
	}

	/**
	 * @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 memory _data
	) public virtual override {
		transferFrom(from, to, tokenId);
		if (to.code.length != 0)
			if (!_checkContractOnERC721Received(from, to, tokenId, _data)) {
				revert TransferToNonERC721ReceiverImplementer();
			}
	}

	/**
	 * @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 Private function to invoke {IERC721Receiver-onERC721Received} on a target contract.
	 *
	 * `from` - Previous owner of the given token ID.
	 * `to` - Target address that will receive the token.
	 * `tokenId` - Token ID to be transferred.
	 * `_data` - Optional data to send along with the call.
	 *
	 * Returns 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))
				}
			}
		}
	}

	// =============================================================
	//                        MINT OPERATIONS
	// =============================================================

	/**
	 * @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 for each mint.
	 */
	function _mint(address to, uint256 quantity) internal virtual {
		uint256 startTokenId = _currentIndex;
		if (quantity == 0) revert MintZeroQuantity();

		_beforeTokenTransfers(address(0), to, startTokenId, quantity);

		// Overflows are incredibly unrealistic.
		// `balance` and `numberMinted` have a maximum limit of 2**64.
		// `tokenId` has a maximum limit of 2**256.
		unchecked {
			// Updates:
			// - `balance += quantity`.
			// - `numberMinted += quantity`.
			//
			// We can directly add to the `balance` and `numberMinted`.
			_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] = _packOwnershipData(
				to,
				_nextInitializedFlag(quantity) | _nextExtraData(address(0), to, 0)
			);

			uint256 toMasked;
			uint256 end = startTokenId + quantity;

			// Use assembly to loop and emit the `Transfer` event for gas savings.
			assembly {
				// Mask `to` to the lower 160 bits, in case the upper bits somehow aren't clean.
				toMasked := and(to, _BITMASK_ADDRESS)
				// Emit the `Transfer` event.
				log4(
					0, // Start of data (0, since no data).
					0, // End of data (0, since no data).
					_TRANSFER_EVENT_SIGNATURE, // Signature.
					0, // `address(0)`.
					toMasked, // `to`.
					startTokenId // `tokenId`.
				)

				for {
					let tokenId := add(startTokenId, 1)
				} iszero(eq(tokenId, end)) {
					tokenId := add(tokenId, 1)
				} {
					// Emit the `Transfer` event. Similar to above.
					log4(0, 0, _TRANSFER_EVENT_SIGNATURE, 0, toMasked, tokenId)
				}
			}
			if (toMasked == 0) revert MintToZeroAddress();

			_currentIndex = end;
		}
		_afterTokenTransfers(address(0), to, startTokenId, quantity);
	}

	/**
	 * @dev Mints `quantity` tokens and transfers them to `to`.
	 *
	 * This function is intended for efficient minting only during contract creation.
	 *
	 * It emits only one {ConsecutiveTransfer} as defined in
	 * [ERC2309](https://eips.ethereum.org/EIPS/eip-2309),
	 * instead of a sequence of {Transfer} event(s).
	 *
	 * Calling this function outside of contract creation WILL make your contract
	 * non-compliant with the ERC721 standard.
	 * For full ERC721 compliance, substituting ERC721 {Transfer} event(s) with the ERC2309
	 * {ConsecutiveTransfer} event is only permissible during contract creation.
	 *
	 * Requirements:
	 *
	 * - `to` cannot be the zero address.
	 * - `quantity` must be greater than 0.
	 *
	 * Emits a {ConsecutiveTransfer} event.
	 */
	function _mintERC2309(address to, uint256 quantity) internal virtual {
		uint256 startTokenId = _currentIndex;
		if (to == address(0)) revert MintToZeroAddress();
		if (quantity == 0) revert MintZeroQuantity();
		if (quantity > _MAX_MINT_ERC2309_QUANTITY_LIMIT) revert MintERC2309QuantityExceedsLimit();

		_beforeTokenTransfers(address(0), to, startTokenId, quantity);

		// Overflows are unrealistic due to the above check for `quantity` to be below the limit.
		unchecked {
			// Updates:
			// - `balance += quantity`.
			// - `numberMinted += quantity`.
			//
			// We can directly add to the `balance` and `numberMinted`.
			_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] = _packOwnershipData(
				to,
				_nextInitializedFlag(quantity) | _nextExtraData(address(0), to, 0)
			);

			emit ConsecutiveTransfer(startTokenId, startTokenId + quantity - 1, address(0), to);

			_currentIndex = startTokenId + quantity;
		}
		_afterTokenTransfers(address(0), to, startTokenId, 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.
	 *
	 * See {_mint}.
	 *
	 * Emits a {Transfer} event for each mint.
	 */
	function _safeMint(address to, uint256 quantity, bytes memory _data) internal virtual {
		_mint(to, quantity);

		unchecked {
			if (to.code.length != 0) {
				uint256 end = _currentIndex;
				uint256 index = end - quantity;
				do {
					if (!_checkContractOnERC721Received(address(0), to, index++, _data)) {
						revert TransferToNonERC721ReceiverImplementer();
					}
				} while (index < end);
				// Reentrancy protection.
				if (_currentIndex != end) revert();
			}
		}
	}

	/**
	 * @dev Equivalent to `_safeMint(to, quantity, '')`.
	 */
	function _safeMint(address to, uint256 quantity) internal virtual {
		_safeMint(to, quantity, "");
	}

	// =============================================================
	//                        BURN OPERATIONS
	// =============================================================

	/**
	 * @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));

		(uint256 approvedAddressSlot, address approvedAddress) = _getApprovedSlotAndAddress(
			tokenId
		);

		if (approvalCheck) {
			// The nested ifs save around 20+ gas over a compound boolean condition.
			if (!_isSenderApprovedOrOwner(approvedAddress, from, _msgSenderERC721A()))
				if (!isApprovedForAll(from, _msgSenderERC721A()))
					revert TransferCallerNotOwnerNorApproved();
		}

		_beforeTokenTransfers(from, address(0), tokenId, 1);

		// Clear approvals from the previous owner.
		assembly {
			if approvedAddress {
				// This is equivalent to `delete _tokenApprovals[tokenId]`.
				sstore(approvedAddressSlot, 0)
			}
		}

		// 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] = _packOwnershipData(
				from,
				(_BITMASK_BURNED | _BITMASK_NEXT_INITIALIZED) |
					_nextExtraData(from, address(0), prevOwnershipPacked)
			);

			// 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++;
		}
	}

	// =============================================================
	//                     EXTRA DATA OPERATIONS
	// =============================================================

	/**
	 * @dev Directly sets the extra data for the ownership data `index`.
	 */
	function _setExtraDataAt(uint256 index, uint24 extraData) internal virtual {
		uint256 packed = _packedOwnerships[index];
		if (packed == 0) revert OwnershipNotInitializedForExtraData();
		uint256 extraDataCasted;
		// Cast `extraData` with assembly to avoid redundant masking.
		assembly {
			extraDataCasted := extraData
		}
		packed =
			(packed & _BITMASK_EXTRA_DATA_COMPLEMENT) |
			(extraDataCasted << _BITPOS_EXTRA_DATA);
		_packedOwnerships[index] = packed;
	}

	/**
	 * @dev Called during each token transfer to set the 24bit `extraData` field.
	 * Intended to be overridden by the cosumer contract.
	 *
	 * `previousExtraData` - the value of `extraData` before transfer.
	 *
	 * 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 _extraData(
		address from,
		address to,
		uint24 previousExtraData
	) internal view virtual returns (uint24) {}

	/**
	 * @dev Returns the next extra data for the packed ownership data.
	 * The returned result is shifted into position.
	 */
	function _nextExtraData(
		address from,
		address to,
		uint256 prevOwnershipPacked
	) private view returns (uint256) {
		uint24 extraData = uint24(prevOwnershipPacked >> _BITPOS_EXTRA_DATA);
		return uint256(_extraData(from, to, extraData)) << _BITPOS_EXTRA_DATA;
	}

	// =============================================================
	//                       OTHER OPERATIONS
	// =============================================================

	/**
	 * @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 virtual 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.
				// The ASCII index of the '0' character is 48.
				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)
		}
	}
}

// SPDX-License-Identifier: MIT
// ERC721A Contracts v4.2.0
// Creator: Chiru Labs

pragma solidity ^0.8.4;

/**
 * @dev Interface of ERC721A.
 */
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();

	/**
	 * 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();

	/**
	 * The `quantity` minted with ERC2309 exceeds the safety limit.
	 */
	error MintERC2309QuantityExceedsLimit();

	/**
	 * The `extraData` cannot be set on an unintialized ownership slot.
	 */
	error OwnershipNotInitializedForExtraData();

	// =============================================================
	//                            STRUCTS
	// =============================================================

	struct TokenOwnership {
		// The address of the owner.
		address addr;
		// Stores the start time of ownership with minimal overhead for tokenomics.
		uint64 startTimestamp;
		// Whether the token has been burned.
		bool burned;
		// Arbitrary data similar to `startTimestamp` that can be set via {_extraData}.
		uint24 extraData;
	}

	// =============================================================
	//                         TOKEN COUNTERS
	// =============================================================

	/**
	 * @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() external view returns (uint256);

	// =============================================================
	//                            IERC165
	// =============================================================

	/**
	 * @dev Returns true if this contract implements the interface defined by
	 * `interfaceId`. See the corresponding
	 * [EIP section](https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified)
	 * to learn more about how these ids are created.
	 *
	 * This function call must use less than 30000 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`,
	 * 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,
		bytes calldata data
	) external;

	/**
	 * @dev Equivalent to `safeTransferFrom(from, to, tokenId, '')`.
	 */
	function safeTransferFrom(address from, address to, uint256 tokenId) external;

	/**
	 * @dev Transfers `tokenId` 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);

	// =============================================================
	//                           IERC2309
	// =============================================================

	/**
	 * @dev Emitted when tokens in `fromTokenId` to `toTokenId`
	 * (inclusive) is transferred from `from` to `to`, as defined in the
	 * [ERC2309](https://eips.ethereum.org/EIPS/eip-2309) standard.
	 *
	 * See {_mintERC2309} for more details.
	 */
	event ConsecutiveTransfer(
		uint256 indexed fromTokenId,
		uint256 toTokenId,
		address indexed from,
		address indexed to
	);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import "./erc721A/ERC721A.sol";
import "./operator_filterer/DefaultOperatorFilterer.sol";

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";

error Neutron__NoSaleStageActive();

error Neutron__ZeroAddressProhibited();
error Neutron__InvalidConfiguration();
error Neutron__InvalidSaleStageIndex();
error Neutron__InvalidInput();

error Neutron__WrongEtherAmmount();
error Neutron__ExceedingMaxSupply();
error Neutron__ExceedingTokensPerStageLimit();
error Neutron__ExceedingTokensPerTransactionLimit();

error Neutron__HashComparisonFailed();
error Neutron__UntrustedSigner();
error Neutron__SignatureAlreadyUsed();

error Neutron__NothingToWithdraw();
error Neutron__WithdrawFailed();

/**
 * @dev Configuration of a sale stage.
 *
 * @param startTime The start time of the sale stage.
 * @param endTime The end time of the sale stage.
 * @param supplyLimitByTheEndOfStage The maximum number of tokens that can be minted by the end of the sale stage.
 * @param maxTokensPerWallet The maximum number of tokens that can be minted by a single wallet during the sale stage.
 * @param maxTokensPerTransaction The maximum number of tokens that can be minted in a single transaction during the sale stage.
 * @param weiTokenPrice The price of a token in wei.
 */
struct SaleStageConfig {
	uint32 startTime;
	uint32 endTime;
	uint16 supplyLimitByTheEndOfStage;
	uint16 maxTokensPerWallet;
	uint16 maxTokensPerTransaction;
	uint256 weiTokenPrice;
}

/**
 * @dev A signature package, that secures the minting of tokens.
 *
 * @param messageHash The hash of the minting operation message.
 * @param signature The signature for the message hash.
 * @param nonce The nonce, that is used to prevent replay attacks.
 */
struct SaleSignaturePackage {
	bytes32 messageHash;
	bytes signature;
	uint64 nonce;
}

/**
 * @title Neutron
 * @author DeployLabs.io
 *
 * @dev Neutron is a contract for managing a token collection.
 * Version 1.2.0
 */
abstract contract Neutron is ERC721A, Ownable, DefaultOperatorFilterer {
	bytes8 private immutable i_hashSalt;
	address private immutable i_signerAddress;

	string private s_baseTokenUri;

	uint16[] internal s_saleStageIds;
	uint16 internal s_lastAssignedStageId = 0;

	mapping(uint16 => SaleStageConfig) internal s_saleStageConfigurations;
	mapping(uint16 => mapping(address => uint256)) internal s_numberMintedDuringStage;

	mapping(uint64 => bool) internal s_usedNonces;

	constructor(
		string memory name,
		string memory symbol,
		bytes8 hashSalt,
		address signerAddress
	) ERC721A(name, symbol) {
		i_hashSalt = hashSalt;
		i_signerAddress = signerAddress;
	}

	/**
	 * @dev Mint a token to the caller.
	 *
	 * @param signaturePackage The signature package for security.
	 * @param quantity The quantity of tokens to mint.
	 */
	function mint(
		SaleSignaturePackage calldata signaturePackage,
		uint256 quantity
	) external payable {
		uint16 currentStageIndex = getCurrentSaleStageIndex();
		uint16 currentStageId = s_saleStageIds[currentStageIndex];
		SaleStageConfig memory config = getSaleStageConfig(currentStageIndex);

		if (msg.value != config.weiTokenPrice * quantity) revert Neutron__WrongEtherAmmount();

		bool exceedingMaxSupply = totalSupply() + quantity > config.supplyLimitByTheEndOfStage;
		bool exceedingLimitPerTransaction = quantity > config.maxTokensPerTransaction;
		bool exceedingLimitPerStage = s_numberMintedDuringStage[currentStageId][msg.sender] +
			quantity >
			config.maxTokensPerWallet;

		if (exceedingMaxSupply) revert Neutron__ExceedingMaxSupply();
		if (exceedingLimitPerStage) revert Neutron__ExceedingTokensPerStageLimit();
		if (exceedingLimitPerTransaction) revert Neutron__ExceedingTokensPerTransactionLimit();

		if (!_isCorrectMintOperationHash(signaturePackage, msg.sender, quantity))
			revert Neutron__HashComparisonFailed();
		if (!_isTrustedSigner(signaturePackage.messageHash, signaturePackage.signature))
			revert Neutron__UntrustedSigner();
		if (s_usedNonces[signaturePackage.nonce]) revert Neutron__SignatureAlreadyUsed();

		s_numberMintedDuringStage[currentStageId][msg.sender] += quantity;
		s_usedNonces[signaturePackage.nonce] = true;

		_safeMint(msg.sender, quantity);
	}

	/**
	 * @dev Withdraw the balance of the contract.
	 *
	 * @param to The address to send the balance to.
	 */
	function withdraw(address payable to) external onlyOwner {
		uint256 balance = address(this).balance;
		if (balance == 0) revert Neutron__NothingToWithdraw();
		if (to == address(0)) revert Neutron__ZeroAddressProhibited();

		(bool success, ) = to.call{ value: address(this).balance }("");
		if (!success) revert Neutron__WithdrawFailed();
	}

	/**
	 * @dev Airdrop tokens to a list of recipients.
	 *
	 * @param airdropTo The list of recipients.
	 * @param quantity The list of quantities.
	 */
	function airdrop(address[] calldata airdropTo, uint256[] calldata quantity) external onlyOwner {
		if (airdropTo.length != quantity.length) revert Neutron__InvalidInput();

		for (uint256 i = 0; i < airdropTo.length; i++) {
			_safeMint(airdropTo[i], quantity[i]);
		}
	}

	/**
	 * @dev Add a new sale stage. The sale stage must be added in chronological order.
	 *
	 * @param config The configuration of the sale stage.
	 */
	function addSaleStage(SaleStageConfig calldata config) external onlyOwner {
		if (config.startTime >= config.endTime) revert Neutron__InvalidConfiguration();
		if (config.supplyLimitByTheEndOfStage == 0) revert Neutron__InvalidConfiguration();
		if (config.maxTokensPerWallet == 0) revert Neutron__InvalidConfiguration();
		if (config.maxTokensPerTransaction == 0) revert Neutron__InvalidConfiguration();

		s_lastAssignedStageId += 1;
		s_saleStageIds.push(s_lastAssignedStageId);
		s_saleStageConfigurations[s_lastAssignedStageId] = config;
	}

	/**
	 * @dev Remove a sale stage.
	 *
	 * @param stageIndex The index of the sale stage to remove.
	 */
	function removeSaleStage(uint16 stageIndex) external onlyOwner {
		if (stageIndex >= s_saleStageIds.length) revert Neutron__InvalidSaleStageIndex();

		for (uint256 i = stageIndex; i < s_saleStageIds.length - 1; i++) {
			s_saleStageIds[i] = s_saleStageIds[i + 1];
		}

		s_saleStageIds.pop();
	}

	/**
	 * @dev Edit an existing sale stage.
	 *
	 * @param stageIndex The index of the sale stage to edit.
	 * @param config The new configuration of the sale stage.
	 */
	function editSaleStage(uint16 stageIndex, SaleStageConfig calldata config) external onlyOwner {
		if (stageIndex >= s_saleStageIds.length) revert Neutron__InvalidSaleStageIndex();
		if (config.startTime >= config.endTime) revert Neutron__InvalidConfiguration();
		if (config.supplyLimitByTheEndOfStage == 0) revert Neutron__InvalidConfiguration();
		if (config.maxTokensPerWallet == 0) revert Neutron__InvalidConfiguration();
		if (config.maxTokensPerTransaction == 0) revert Neutron__InvalidConfiguration();

		s_saleStageConfigurations[s_saleStageIds[stageIndex]] = config;
	}

	/**
	 * @dev Reset a sale stage. This will increment the stage ID, which will invalidate all previous linked operations.
	 *
	 * @param stageIndex The index of the sale stage to reset.
	 */
	function resetSaleStage(uint16 stageIndex) external onlyOwner {
		if (stageIndex >= s_saleStageIds.length) revert Neutron__InvalidSaleStageIndex();

		s_lastAssignedStageId += 1;
		s_saleStageIds[stageIndex] = s_lastAssignedStageId;
	}

	/**
	 * @dev Set base URI for token metadata.
	 *
	 * @param baseUri The base URI for token metadata.
	 */
	function setBaseUri(string calldata baseUri) external onlyOwner {
		s_baseTokenUri = baseUri;
	}

	/**
	 * @dev Get the number of sale stages.
	 *
	 * @return saleStagesCount The number of sale stages in the contract.
	 */
	function getSaleStagesCount() external view returns (uint256 saleStagesCount) {
		saleStagesCount = s_saleStageIds.length;
	}

	/**
	 * @dev Get the number of tokens minted during a sale stage.
	 *
	 * @param stageIndex The index of the sale stage.
	 * @param wallet The wallet to get the count for.
	 *
	 * @return countMintedDuringStage The number of tokens minted during the sale stage.
	 */
	function getMintedCountDuringSaleStage(
		uint16 stageIndex,
		address wallet
	) external view returns (uint256 countMintedDuringStage) {
		if (stageIndex >= s_saleStageIds.length) revert Neutron__InvalidSaleStageIndex();

		countMintedDuringStage = s_numberMintedDuringStage[s_saleStageIds[stageIndex]][wallet];
	}

	// Overrides for marketplace restrictions.
	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);
	}

	/**
	 * @dev Get the sale stage configuration.
	 *
	 * @param stageIndex The index of the sale stage.
	 *
	 * @return config The sale stage configuration.
	 */
	function getSaleStageConfig(
		uint16 stageIndex
	) public view returns (SaleStageConfig memory config) {
		if (stageIndex >= s_saleStageIds.length) revert Neutron__InvalidSaleStageIndex();

		config = s_saleStageConfigurations[s_saleStageIds[stageIndex]];
	}

	/**
	 * @dev Get the current sale stage index.
	 *
	 * @return currentStageIndex The current sale stage index.
	 */
	function getCurrentSaleStageIndex() public view returns (uint16 currentStageIndex) {
		uint256 currentTimestamp = block.timestamp;
		uint16[] memory saleStageIds = s_saleStageIds;

		for (; currentStageIndex < saleStageIds.length; currentStageIndex++) {
			SaleStageConfig memory config = s_saleStageConfigurations[
				saleStageIds[currentStageIndex]
			];

			if (currentTimestamp >= config.startTime && currentTimestamp < config.endTime) {
				return currentStageIndex;
			}
		}

		revert Neutron__NoSaleStageActive();
	}

	/**
	 * @dev Get data used to generate the signature.
	 *
	 * @return hashSalt The hash salt.
	 * @return signerAddress The signer address.
	 */
	function getSignatureData() public view returns (bytes8 hashSalt, address signerAddress) {
		return (i_hashSalt, i_signerAddress);
	}

	/**
	 * @dev Starting ID for the tokens.
	 *
	 * @return The starting ID for the tokens.
	 */
	function _startTokenId() internal view virtual override returns (uint256) {
		return 1;
	}

	/**
	 * @dev Get base token URI.
	 *
	 * @return The base token URI.
	 */
	function _baseURI() internal view virtual override returns (string memory) {
		return s_baseTokenUri;
	}

	/**
	 * @dev Check whether a message hash is the one that has been signed.
	 *
	 * @param signaturePackage The signature package.
	 * @param mintTo The address of the minter.
	 * @param quantity The quantity of tokens to mint.
	 *
	 * @return isCorrectMintOperationHash Whether the message hash matches the one that has been signed.
	 */
	function _isCorrectMintOperationHash(
		SaleSignaturePackage calldata signaturePackage,
		address mintTo,
		uint256 quantity
	) internal view returns (bool isCorrectMintOperationHash) {
		uint16 currentSaleStageIndex = getCurrentSaleStageIndex();

		bytes memory message = abi.encodePacked(
			i_hashSalt,
			mintTo,
			uint64(block.chainid),
			currentSaleStageIndex,
			uint64(quantity),
			signaturePackage.nonce
		);
		bytes32 messageHash = keccak256(message);

		isCorrectMintOperationHash = messageHash == signaturePackage.messageHash;
	}

	/**
	 * @dev Check whether a message hash was signed by a trusted address.
	 *
	 * @param messageHash The hash of the opertaion message.
	 * @param signature The signature for the message hash.
	 *
	 * @return isTrustedSigner Whether the message was signed by a trusted address.
	 */
	function _isTrustedSigner(
		bytes32 messageHash,
		bytes memory signature
	) internal view returns (bool isTrustedSigner) {
		isTrustedSigner = i_signerAddress == ECDSA.recover(messageHash, signature);
	}
}

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

import { OperatorFilterer } from "./OperatorFilterer.sol";
import { CANONICAL_CORI_SUBSCRIPTION } from "./lib/Constants.sol";

/**
 * @title  DefaultOperatorFilterer
 * @notice Inherits from OperatorFilterer and automatically subscribes to the default OpenSea subscription.
 * @dev    Please note that if your token contract does not provide an owner with EIP-173, it must provide
 *         administration methods on the contract itself to interact with the registry otherwise the subscription
 *         will be locked to the options set during construction.
 */

abstract contract DefaultOperatorFilterer is OperatorFilterer {
	/// @dev The constructor that is called when the contract is being deployed.
	constructor() OperatorFilterer(CANONICAL_CORI_SUBSCRIPTION, true) {}
}

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

interface IOperatorFilterRegistry {
	/**
	 * @notice Returns true if operator is not filtered for a given token, either by address or codeHash. Also returns
	 *         true if supplied registrant address is not registered.
	 */
	function isOperatorAllowed(address registrant, address operator) external view returns (bool);

	/**
	 * @notice Registers an address with the registry. May be called by address itself or by EIP-173 owner.
	 */
	function register(address registrant) external;

	/**
	 * @notice Registers an address with the registry and "subscribes" to another address's filtered operators and codeHashes.
	 */
	function registerAndSubscribe(address registrant, address subscription) external;

	/**
	 * @notice Registers an address with the registry and copies the filtered operators and codeHashes from another
	 *         address without subscribing.
	 */
	function registerAndCopyEntries(address registrant, address registrantToCopy) external;

	/**
	 * @notice Unregisters an address with the registry and removes its subscription. May be called by address itself or by EIP-173 owner.
	 *         Note that this does not remove any filtered addresses or codeHashes.
	 *         Also note that any subscriptions to this registrant will still be active and follow the existing filtered addresses and codehashes.
	 */
	function unregister(address addr) external;

	/**
	 * @notice Update an operator address for a registered address - when filtered is true, the operator is filtered.
	 */
	function updateOperator(address registrant, address operator, bool filtered) external;

	/**
	 * @notice Update multiple operators for a registered address - when filtered is true, the operators will be filtered. Reverts on duplicates.
	 */
	function updateOperators(
		address registrant,
		address[] calldata operators,
		bool filtered
	) external;

	/**
	 * @notice Update a codeHash for a registered address - when filtered is true, the codeHash is filtered.
	 */
	function updateCodeHash(address registrant, bytes32 codehash, bool filtered) external;

	/**
	 * @notice Update multiple codeHashes for a registered address - when filtered is true, the codeHashes will be filtered. Reverts on duplicates.
	 */
	function updateCodeHashes(
		address registrant,
		bytes32[] calldata codeHashes,
		bool filtered
	) external;

	/**
	 * @notice Subscribe an address to another registrant's filtered operators and codeHashes. Will remove previous
	 *         subscription if present.
	 *         Note that accounts with subscriptions may go on to subscribe to other accounts - in this case,
	 *         subscriptions will not be forwarded. Instead the former subscription's existing entries will still be
	 *         used.
	 */
	function subscribe(address registrant, address registrantToSubscribe) external;

	/**
	 * @notice Unsubscribe an address from its current subscribed registrant, and optionally copy its filtered operators and codeHashes.
	 */
	function unsubscribe(address registrant, bool copyExistingEntries) external;

	/**
	 * @notice Get the subscription address of a given registrant, if any.
	 */
	function subscriptionOf(address addr) external returns (address registrant);

	/**
	 * @notice Get the set of addresses subscribed to a given registrant.
	 *         Note that order is not guaranteed as updates are made.
	 */
	function subscribers(address registrant) external returns (address[] memory);

	/**
	 * @notice Get the subscriber at a given index in the set of addresses subscribed to a given registrant.
	 *         Note that order is not guaranteed as updates are made.
	 */
	function subscriberAt(address registrant, uint256 index) external returns (address);

	/**
	 * @notice Copy filtered operators and codeHashes from a different registrantToCopy to addr.
	 */
	function copyEntriesOf(address registrant, address registrantToCopy) external;

	/**
	 * @notice Returns true if operator is filtered by a given address or its subscription.
	 */
	function isOperatorFiltered(address registrant, address operator) external returns (bool);

	/**
	 * @notice Returns true if the hash of an address's code is filtered by a given address or its subscription.
	 */
	function isCodeHashOfFiltered(
		address registrant,
		address operatorWithCode
	) external returns (bool);

	/**
	 * @notice Returns true if a codeHash is filtered by a given address or its subscription.
	 */
	function isCodeHashFiltered(address registrant, bytes32 codeHash) external returns (bool);

	/**
	 * @notice Returns a list of filtered operators for a given address or its subscription.
	 */
	function filteredOperators(address addr) external returns (address[] memory);

	/**
	 * @notice Returns the set of filtered codeHashes for a given address or its subscription.
	 *         Note that order is not guaranteed as updates are made.
	 */
	function filteredCodeHashes(address addr) external returns (bytes32[] memory);

	/**
	 * @notice Returns the filtered operator at the given index of the set of filtered operators for a given address or
	 *         its subscription.
	 *         Note that order is not guaranteed as updates are made.
	 */
	function filteredOperatorAt(address registrant, uint256 index) external returns (address);

	/**
	 * @notice Returns the filtered codeHash at the given index of the list of filtered codeHashes for a given address or
	 *         its subscription.
	 *         Note that order is not guaranteed as updates are made.
	 */
	function filteredCodeHashAt(address registrant, uint256 index) external returns (bytes32);

	/**
	 * @notice Returns true if an address has registered
	 */
	function isRegistered(address addr) external returns (bool);

	/**
	 * @dev Convenience method to compute the code hash of an arbitrary contract
	 */
	function codeHashOf(address addr) external returns (bytes32);
}

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

address constant CANONICAL_OPERATOR_FILTER_REGISTRY_ADDRESS = 0x000000000000AAeB6D7670E522A718067333cd4E;
address constant CANONICAL_CORI_SUBSCRIPTION = 0x3cc6CddA760b79bAfa08dF41ECFA224f810dCeB6;

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

import { IOperatorFilterRegistry } from "./IOperatorFilterRegistry.sol";
import { CANONICAL_OPERATOR_FILTER_REGISTRY_ADDRESS } from "./lib/Constants.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.
 *         Please note that if your token contract does not provide an owner with EIP-173, it must provide
 *         administration methods on the contract itself to interact with the registry otherwise the subscription
 *         will be locked to the options set during construction.
 */

abstract contract OperatorFilterer {
	/// @dev Emitted when an operator is not allowed.
	error OperatorNotAllowed(address operator);

	IOperatorFilterRegistry public constant OPERATOR_FILTER_REGISTRY =
		IOperatorFilterRegistry(CANONICAL_OPERATOR_FILTER_REGISTRY_ADDRESS);

	/// @dev The constructor that is called when the contract is being deployed.
	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));
				}
			}
		}
	}

	/**
	 * @dev A helper function to check if an operator is allowed.
	 */
	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);
		}
		_;
	}

	/**
	 * @dev A helper function to check if an operator approval is allowed.
	 */
	modifier onlyAllowedOperatorApproval(address operator) virtual {
		_checkFilterOperator(operator);
		_;
	}

	/**
	 * @dev A helper function to check if an operator is allowed.
	 */
	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) {
			// under normal circumstances, this function will revert rather than return false, but inheriting contracts
			// may specify their own OperatorFilterRegistry implementations, which may behave differently
			if (!OPERATOR_FILTER_REGISTRY.isOperatorAllowed(address(this), operator)) {
				revert OperatorNotAllowed(operator);
			}
		}
	}
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

/*
     .d8888b.   .d88888b.  888      .d8888b.  
    d88P  Y88b d88P" "Y88b 888     d88P  Y88b 
    Y88b.      888     888 888          .d88P 
     "Y888b.   888     888 888         8888"  
        "Y88b. 888     888 888          "Y8b. 
          "888 888     888 888     888    888 
    Y88b  d88P Y88b. .d88P 888     Y88b  d88P 
     "Y8888P"   "Y88888P"  88888888 "Y8888P"  
                                          
    Sol3Mates All Rights Reserved 2022
    Developed by DeployLabs.io ([email protected])
*/

import "./library/Neutron.sol";

error Sol3Mates__ZeroAddressProhibited();

error Sol3Mates__NotACrossmintWallet();
error Sol3Mates__CrossmintNotSupportedOnThatStage();

/**
 * @title Sol3Mates
 * @author DeployLabs.io
 *
 * @dev Sol3Mates is a contract for managing airdrops and sales of Sol3Mates NFTs.
 */
contract Sol3Mates is
	Neutron(
		"SOL3MATES OG NFT",
		"SOL3",
		0x67a95d40d901ae1a,
		0x3dD6175Fa612Ca0C95B810E487736108e4E53C1a
	)
{
	uint16 private s_publicSaleStageIndex;
	address private s_crossmintAddress;

	/**
	 * @dev Mint tokens to the specified address through crossmint.io.
	 *
	 * @param mintTo The address to mint the token to.
	 * @param quantity The quantity of tokens to mint.
	 */
	function crossmintMint(address mintTo, uint256 quantity) external payable {
		if (msg.sender != s_crossmintAddress) revert Sol3Mates__NotACrossmintWallet();

		uint16 currentStageIndex = getCurrentSaleStageIndex();
		if (currentStageIndex != s_publicSaleStageIndex)
			revert Sol3Mates__CrossmintNotSupportedOnThatStage();

		uint16 currentStageId = s_saleStageIds[currentStageIndex];
		SaleStageConfig memory config = getSaleStageConfig(currentStageIndex);

		if (msg.value != config.weiTokenPrice * quantity) revert Neutron__WrongEtherAmmount();

		bool exceedingMaxSupply = totalSupply() + quantity > config.supplyLimitByTheEndOfStage;
		bool exceedingLimitPerTransaction = quantity > config.maxTokensPerTransaction;
		bool exceedingLimitPerStage = s_numberMintedDuringStage[currentStageId][mintTo] + quantity >
			config.maxTokensPerWallet;

		if (exceedingMaxSupply) revert Neutron__ExceedingMaxSupply();
		if (exceedingLimitPerStage) revert Neutron__ExceedingTokensPerStageLimit();
		if (exceedingLimitPerTransaction) revert Neutron__ExceedingTokensPerTransactionLimit();

		s_numberMintedDuringStage[currentStageId][mintTo] += quantity;

		_safeMint(mintTo, quantity);
	}

	/**
	 * @dev Set the index of the public sale stage. Used for crossmint sales allowance.
	 *
	 * @param stageIndex The index of the public sale stage.
	 */
	function setPublicSaleStageIndex(uint16 stageIndex) external onlyOwner {
		if (stageIndex >= s_saleStageIds.length) revert Neutron__InvalidSaleStageIndex();

		s_publicSaleStageIndex = stageIndex;
	}

	/**
	 * @dev Set the address of the crossmint.io contract.
	 *
	 * @param crossmintAddress The address of the crossmint.io contract.
	 */
	function setCrossmintAddress(address crossmintAddress) external onlyOwner {
		if (crossmintAddress == address(0)) revert Sol3Mates__ZeroAddressProhibited();

		s_crossmintAddress = crossmintAddress;
	}
}

{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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SaleStageConfig","name":"config","type":"tuple"}],"name":"editSaleStage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getCurrentSaleStageIndex","outputs":[{"internalType":"uint16","name":"currentStageIndex","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint16","name":"stageIndex","type":"uint16"},{"internalType":"address","name":"wallet","type":"address"}],"name":"getMintedCountDuringSaleStage","outputs":[{"internalType":"uint256","name":"countMintedDuringStage","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint16","name":"stageIndex","type":"uint16"}],"name":"getSaleStageConfig","outputs":[{"components":[{"internalType":"uint32","name":"startTime","type":"uint32"},{"internalType":"uint32","name":"endTime","type":"uint32"},{"internalType":"uint16","name":"supplyLimitByTheEndOfStage","type":"uint16"},{"internalType":"uint16","name":"maxTokensPerWallet","type":"uint16"},{"internalType":"uint16","name":"maxTokensPerTransaction","type":"uint16"},{"internalType":"uint256","name":"weiTokenPrice","type":"uint256"}],"internalType":"struct SaleStageConfig","name":"config","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getSaleStagesCount","outputs":[{"internalType":"uint256","name":"saleStagesCount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getSignatureData","outputs":[{"internalType":"bytes8","name":"hashSalt","type":"bytes8"},{"internalType":"address","name":"signerAddress","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"messageHash","type":"bytes32"},{"internalType":"bytes","name":"signature","type":"bytes"},{"internalType":"uint64","name":"nonce","type":"uint64"}],"internalType":"struct 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