// File: contracts/MNRY_MC_4/Moonray_MiiumChampion_Delta.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.11;

import './Moonray_MiiumChampion_DeltaBase.sol';
import './Moonray_MiiumChampion_DeltaSplitsAndRoyalties.sol';

/**
 * @title Moonray_MiiumChampion_Delta
 */
contract Moonray_MiiumChampion_Delta is Moonray_MiiumChampion_DeltaSplitsAndRoyalties, Moonray_MiiumChampion_DeltaBase {
    constructor()
        Moonray_MiiumChampion_DeltaBase(
            'Moonray_MiiumChampion_Delta',
            'MNRY_MC_4',
            'https://nftculture.mypinata.cloud/ipfs/',
            addresses,
            splits,
            0.025 ether,
            0.025 ether,
            0.025 ether
        )
    {
        // Implementation version: v1.0.0
    }

    function supportsInterface(bytes4 interfaceId)
        public
        view
        virtual
        override(ERC721AExpandable, ERC2981)
        returns (bool)
    {
        return super.supportsInterface(interfaceId);
    }

    function _getInitialFlavors() internal pure override returns (TokenFlavor[] memory) {
        TokenFlavor memory orangeAndGrey = TokenFlavor(
            1104400,
            .025 ether,
            500,
            0,
            'QmVqfJ8M6iLKHZpdX79qreaPU2Wzs9Pngb27vZuwfzt4cG/token1'
        );

        TokenFlavor[] memory initialFlavors = new TokenFlavor[](1);

        initialFlavors[0] = orangeAndGrey;

        return initialFlavors;
    }
}

// File: contracts/MNRY_MC_4/Moonray_MiiumChampion_DeltaBase.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.11;

// NFTC Open Source Contracts See: https://github.com/NFTCulture/nftc-open-contracts
import '@nftculture/nftc-open-contracts/contracts/security/GuardedAgainstContracts.sol';
import '@nftculture/nftc-open-contracts/contracts/financial/LockedPaymentSplitter.sol';

// NFTC Prerelease Contracts
import '@nftculture/nftc-contract-library/contracts/token/phased/PhasedMintThree.sol';
import '@nftculture/nftc-contract-library/contracts/token/phased/PhaseOneIsIndexed.sol';
import '@nftculture/nftc-contract-library/contracts/token/phased/PhaseTwoIsIndexed.sol';
import '@nftculture/nftc-contract-library/contracts/token/ERC721AExpandable.sol';

// OZ Libraries
import '@openzeppelin/contracts/security/ReentrancyGuard.sol';
import '@openzeppelin/contracts/access/Ownable.sol';
import '@openzeppelin/contracts/utils/Strings.sol';

// Error Codes
error ExceedsBatchSize();
error ExceedsPurchaseLimit();
error ExceedsSupplyCap();
error InvalidPayment();

/**
 * @title Moonray_MiiumChampion_DeltaBase
 * @author @NiftyMike | @NFTCulture
 * @dev ERC721a Implementation with @NFTCulture standardized components.
 *
 * Public Mint is Phase Three.
 */
abstract contract Moonray_MiiumChampion_DeltaBase is
    ERC721AExpandable,
    Ownable,
    GuardedAgainstContracts,
    ReentrancyGuard,
    LockedPaymentSplitter,
    PhasedMintThree,
    PhaseOneIsIndexed,
    PhaseTwoIsIndexed
{
    using Strings for uint256;

    uint256 private constant MAX_RESERVE_BATCH_SIZE = 100;

    uint256 private constant PHASE_ONE_BATCH_SIZE = 10;
    uint256 private constant PHASE_ONE_PURCHASE_LIMIT = 1000; // Not Used
    uint256 private constant PHASE_ONE_SUPPLY_CAP = 10000; // Not Used

    uint256 private constant PHASE_TWO_BATCH_SIZE = 10;
    uint256 private constant PHASE_TWO_PURCHASE_LIMIT = 1000; // Not Used
    uint256 private constant PHASE_TWO_SUPPLY_CAP = 10000; // Not Used

    uint256 private constant PUBLIC_MINT_BATCH_SIZE = 10;
    uint256 private constant PUBLIC_MINT_PURCHASE_LIMIT = 1000; // Not Used
    uint256 private constant PUBLIC_MINT_SUPPLY_CAP = 10000; // Enforced per-flavor

    string public baseURI;

    constructor(
        string memory __name,
        string memory __symbol,
        string memory __baseURI,
        address[] memory __addresses,
        uint256[] memory __splits,
        uint256 __phaseOnePricePerNft,
        uint256 __phaseTwoPricePerNft,
        uint256 __phaseThreePricePerNft
    )
        ERC721AExpandable(__name, __symbol)
        SlimPaymentSplitter(__addresses, __splits)
        PhasedMintThree(__phaseOnePricePerNft, __phaseTwoPricePerNft, __phaseThreePricePerNft)
        ExpandableTypedTokenExtension(true)
    {
        baseURI = __baseURI;
    }

    function nftcContractDefinition() external pure returns (string memory) {
        // NFTC Contract Definition for front-end websites.
        return
            string(
                abi.encodePacked(
                    '{',
                    '"ncdVersion":1,', // NFTC Contract Definition version.
                    '"phases":3,', // # of mint phases?
                    '"type":"Expandable",', // do tokens have a type? [Static | Expandable]
                    '"openEdition":false', // is collection an open edition? [true | false]
                    '}'
                )
            );
    }

    function phaseOneBatchSize() external pure returns (uint256) {
        return PHASE_ONE_BATCH_SIZE;
    }

    function phaseTwoBatchSize() external pure returns (uint256) {
        return PHASE_TWO_BATCH_SIZE;
    }

    function publicMintBatchSize() external pure returns (uint256) {
        return PUBLIC_MINT_BATCH_SIZE;
    }

    function setBaseURI(string memory __baseUri) external onlyOwner {
        baseURI = __baseUri;
    }

    function _baseURI() internal view virtual override returns (string memory) {
        return baseURI;
    }

    function setMerkleRoots(bytes32 __indexedRoot1, bytes32 __indexedRoot2) external onlyOwner {
        _setMerkleRoots(__indexedRoot1, __indexedRoot2);
    }

    function _setMerkleRoots(bytes32 __phaseOneRoot, bytes32 __phaseTwoRoot) internal {
        if (__phaseOneRoot != 0) {
            _setPhaseOneRoot(__phaseOneRoot);
        }

        if (__phaseTwoRoot != 0) {
            _setPhaseTwoRoot(__phaseTwoRoot);
        }
    }

    function _getPackedPurchasesAs64(address wallet)
        internal
        view
        virtual
        override(PhaseOneIsIndexed, PhaseTwoIsIndexed)
        returns (uint64)
    {
        return _getAux(wallet);
    }

    /**
     * @notice Owner: reserve tokens for team.
     *
     * @param friends addresses to send tokens to.
     * @param count the number of tokens to mint.
     * @param flavorId the type of tokens to mint.
     */
    function reserveTokens(
        address[] memory friends,
        uint256 count,
        uint256 flavorId
    ) external payable onlyOwner {
        if (0 >= count || count > MAX_RESERVE_BATCH_SIZE) revert ExceedsBatchSize();

        TokenFlavor memory updatedFlavor = _canMint(count * friends.length, flavorId, false, 0);
        _saveTokenFlavor(updatedFlavor);

        uint256 idx;
        for (idx = 0; idx < friends.length; idx++) {
            _internalMintTokensOfFlavor(friends[idx], count, flavorId);
        }
    }

    /**
     * @notice Mint tokens - purchase bound by terms & conditions of project.
     *
     * @param count the number of tokens to mint.
     * @param flavorId the type of tokens to mint.
     */
    function publicMintTokens(uint256 count, uint256 flavorId) external payable nonReentrant onlyUsers isPublicMinting {
        if (0 >= count || count > PUBLIC_MINT_BATCH_SIZE) revert ExceedsBatchSize();

        TokenFlavor memory updatedFlavor = _canMint(count, flavorId, true, msg.value);
        _saveTokenFlavor(updatedFlavor);

        _internalMintTokensOfFlavor(msg.sender, count, flavorId);
    }

    /**
     * @notice Mint tokens (Phase One) - purchase bound by terms & conditions of project.
     *
     * @param proof the merkle proof for this purchase.
     * @param count the number of tokens to mint.
     * @param flavorId the type of tokens to mint.
     */
    function phaseOneMintTokens(
        bytes32[] calldata proof,
        uint256 count,
        uint256 flavorId
    ) external payable nonReentrant isPhaseOne {
        if (0 >= count || count > PHASE_ONE_BATCH_SIZE) revert ExceedsBatchSize();

        TokenFlavor memory updatedFlavor = _canMint(count, flavorId, true, msg.value);
        _saveTokenFlavor(updatedFlavor);

        (uint32 phaseOnePurchases, uint32 otherPhase) = _unpack32(_getAux(msg.sender));
        uint256 newBalance = phaseOnePurchases + count;
        if (newBalance > PHASE_ONE_PURCHASE_LIMIT) revert ExceedsPurchaseLimit();
        _setAux(msg.sender, _pack32(uint16(newBalance), otherPhase));

        _proofMintTokensOfFlavor_PhaseOne(msg.sender, proof, newBalance, count, flavorId);
    }

    /**
     * @notice Mint tokens (Phase Two) - purchase bound by terms & conditions of project.
     *
     * @param proof the merkle proof for this purchase.
     * @param count the number of tokens to mint.
     * @param flavorId the type of tokens to mint.
     */
    function phaseTwoMintTokens(
        bytes32[] calldata proof,
        uint256 count,
        uint256 flavorId
    ) external payable nonReentrant isPhaseTwo {
        if (0 >= count || count > PHASE_TWO_BATCH_SIZE) revert ExceedsBatchSize();

        TokenFlavor memory updatedFlavor = _canMint(count, flavorId, true, msg.value);
        _saveTokenFlavor(updatedFlavor);

        (uint32 otherPhase, uint32 phaseTwoPurchases) = _unpack32(_getAux(msg.sender));
        uint256 newBalance = phaseTwoPurchases + count;
        if (newBalance > PHASE_TWO_PURCHASE_LIMIT) revert ExceedsPurchaseLimit();
        _setAux(msg.sender, _pack32(otherPhase, uint16(newBalance)));

        _proofMintTokensOfFlavor_PhaseTwo(msg.sender, proof, newBalance, count, flavorId);
    }

    function _internalMintTokens(address minter, uint256 count)
        internal
        override(PhaseOneIsIndexed, PhaseTwoIsIndexed)
    {
        // Do nothing
    }

    function _internalMintTokens(
        address minter,
        uint256 count,
        uint256 flavorId
    ) internal override(PhaseOneIsIndexed, PhaseTwoIsIndexed) {
        _internalMintTokensOfFlavor(minter, count, flavorId);
    }
}

// File: contracts/MNRY_MC_4/Moonray_MiiumChampion_DeltaSplitsAndRoyalties.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.11;

import '@openzeppelin/contracts/token/common/ERC2981.sol';

contract Moonray_MiiumChampion_DeltaSplitsAndRoyalties is ERC2981 {
    address[] internal addresses = [0x40966a835a9a8993BeD9aE541e2a3F00c7734c0D];

    uint256[] internal splits = [100];

    uint96 private constant DEFAULT_ROYALTY_BASIS_POINTS = 750;

    constructor() {
        // Default royalty information to be this contract, so that no potential
        // royalty payments are missed by marketplaces that support ERC2981.
        _setDefaultRoyalty(address(this), DEFAULT_ROYALTY_BASIS_POINTS);
    }
}

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



// 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);
    }
}

// File: @openzeppelin/contracts/security/ReentrancyGuard.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// File: @nftculture/nftc-open-contracts/contracts/financial/LockedPaymentSplitter.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.11;

import "./SlimPaymentSplitter.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

/**
 * @title LockedPaymentSplitter
 * @author @NiftyMike, NFT Culture
 * @dev A wrapper around SlimPaymentSplitter which adds on security elements.
 *
 * Based on OpenZeppelin Contracts v4.4.1 (finance/PaymentSplitter.sol)
 */
abstract contract LockedPaymentSplitter is SlimPaymentSplitter, Ownable {
    /**
     * @dev Overrides release() method, so that it can only be called by owner.
     * @notice Owner: Release funds to a specific address.
     *
     * @param account Payable address that will receive funds.
     */
    function release(address payable account) public override onlyOwner {
        super.release(account);
    }

    /**
     * @dev Triggers a transfer to caller's address of the amount of Ether they are owed, according to their percentage of the
     * total shares and their previous withdrawals.
     * @notice Sender: request payment.
     */
    function releaseToSelf() public {
        super.release(payable(msg.sender));
    }
}

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



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

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_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) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @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] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

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

// File: @nftculture/nftc-open-contracts/contracts/security/GuardedAgainstContracts.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.11;

/**
 * @title GuardedAgainstContracts
 * @author @NiftyMike, NFT Culture
 * @dev Helper contract to help protect against contract based mint spamming attacks.
 */
abstract contract GuardedAgainstContracts {
    modifier onlyUsers() {
        require(tx.origin == msg.sender, 'Must be user');
        _;
    }
}

// File: @nftculture/nftc-contract-library/contracts/token/ERC721AExpandable.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.11;

// ERC721A from Chiru Labs
import 'erc721a/contracts/ERC721A.sol';

// OZ Libraries
import '@openzeppelin/contracts/utils/Strings.sol';

import './ExpandableTypedTokenExtension.sol';

/**
 * @title ERC721AExpandable
 * @author @NiftyMike | @Dr3amLabs
 * @dev Extend ERC721A contract to add expandable token types.
 */
abstract contract ERC721AExpandable is ERC721A, ExpandableTypedTokenExtension {
    using Strings for uint256;

    constructor(string memory __name, string memory __symbol) ERC721A(__name, __symbol) {
        // Nothing to do
    }

    function supportsInterface(bytes4 interfaceId)
        public
        view
        virtual
        override(ERC721A, AccessControl)
        returns (bool)
    {
        return super.supportsInterface(interfaceId);
    }

    function maxSupply() external view returns (uint256) {
        return _expandableMaxSupply();
    }

    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), 'No token');

        string memory base = _baseURI();
        require(bytes(base).length > 0, 'Base unset');

        uint256 flavor = _getFlavorForToken(tokenId);

        return
            string(
                abi.encodePacked(base, _getUriFragmentForToken(tokenId, _getTokenFlavor(flavor)))
            );
    }

    function _canMint(
        uint256 count,
        uint256 flavorId,
        bool enforceValue,
        uint256 valueSent
    ) internal view returns (TokenFlavor memory) {
        TokenFlavor memory tokenFlavor = _getTokenFlavor(flavorId);
        _checkFlavorIsValid(tokenFlavor);
        _checkCountIsValid(tokenFlavor, count);

        if (enforceValue) {
            _checkValueIsValid(tokenFlavor, count, valueSent);
        }
        tokenFlavor.totalMinted += uint64(count);

        return tokenFlavor;
    }

    function _internalMintTokensOfFlavor(
        address minter,
        uint256 count,
        uint256 flavorId
    ) internal {
        uint256 nextToken = _nextTokenId();

        _safeMint(minter, count);

        _setFlavorForToken(nextToken, flavorId);
        if (count > 1) {
            // Even though this code has to do quite a few duplicate lookups to get the ownerships initialized
            // the gas efficiency is still quite good. It's only about 5% cheaper to modify ERC721a to directly
            // set extra data.
            for (
                uint256 nextTokenIdx = nextToken + 1;
                nextTokenIdx < nextToken + count;
                nextTokenIdx++
            ) {
                _initializeOwnershipAt(nextTokenIdx);
                _setFlavorForToken(nextTokenIdx, flavorId);
            }
        }
    }

    function _setFlavorForToken(uint256 tokenId, uint256 selectedSkin) internal {
        _setExtraDataAt(tokenId, uint24(selectedSkin));
    }

    function _extraData(
        address from,
        address to,
        uint24 previousExtraData
    ) internal pure override returns (uint24) {
        if (from == to) {
            // Nothing to do. Just doing this to get rid of warning.
        }

        // Just return the existing extra data, which is the selected flavor for the token.
        return previousExtraData;
    }

    function _getFlavorForToken(uint256 tokenId) internal view returns (uint256) {
        uint24 extraData = uint24(_ownershipAt(tokenId).extraData);
        return uint256(extraData);
    }
}

// File: @nftculture/nftc-contract-library/contracts/token/phased/PhasedMintThree.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.11;

// OZ Libraries
import '@openzeppelin/contracts/access/Ownable.sol';

import './PhasedMintBase.sol';

/**
 * @title PhasedMintThree
 * @author @NiftyMike, NFT Culture
 * @dev PhasedMint: An approach to a standard system of controlling mint phases.
 *
 * This is the "Three" phase mint flavor of the PhasedMint approach.
 *
 * Note: Since the last phase is always assumed to be the public mint phase, we only
 * need to define the first and second phases here.
 */
contract PhasedMintThree is Ownable, PhasedMintBase {
    using BooleanPacking for uint256;

    uint256 private constant PHASE_ONE = 1;
    uint256 private constant PHASE_TWO = 2;

    uint256 public phaseOnePricePerNft;
    uint256 public phaseTwoPricePerNft;

    modifier isPhaseOne() {
        require(_mintControlFlags.getBoolean(PHASE_ONE), 'Phase one stopped');
        _;
    }

    modifier isPhaseTwo() {
        require(_mintControlFlags.getBoolean(PHASE_TWO), 'Phase two stopped');
        _;
    }

    constructor(
        uint256 __phaseOnePricePerNft,
        uint256 __phaseTwoPricePerNft,
        uint256 __publicMintPricePerNft
    ) PhasedMintBase(3, __publicMintPricePerNft) {
        phaseOnePricePerNft = __phaseOnePricePerNft;
        phaseTwoPricePerNft = __phaseTwoPricePerNft;
    }

    function setMintingState(
        bool __phaseOneActive,
        bool __phaseTwoActive,
        bool __publicMintingActive,
        uint256 __phaseOnePricePerNft,
        uint256 __phaseTwoPricePerNft,
        uint256 __publicMintPricePerNft
    ) external onlyOwner {
        uint256 tempControlFlags = _setMintingState(__publicMintingActive, __publicMintPricePerNft);

        tempControlFlags = tempControlFlags.setBoolean(PHASE_ONE, __phaseOneActive);

        tempControlFlags = tempControlFlags.setBoolean(PHASE_TWO, __phaseTwoActive);

        _mintControlFlags = tempControlFlags;

        if (__phaseOnePricePerNft > 0) {
            phaseOnePricePerNft = __phaseOnePricePerNft;
        }

        if (__phaseTwoPricePerNft > 0) {
            phaseTwoPricePerNft = __phaseTwoPricePerNft;
        }
    }

    function isPhaseOneActive() external view returns (bool) {
        return _isPhaseOneActive();
    }

    function _isPhaseOneActive() internal view returns (bool) {
        return _mintControlFlags.getBoolean(PHASE_ONE);
    }

    function isPhaseTwoActive() external view returns (bool) {
        return _isPhaseTwoActive();
    }

    function _isPhaseTwoActive() internal view returns (bool) {
        return _mintControlFlags.getBoolean(PHASE_TWO);
    }
}

// File: @nftculture/nftc-contract-library/contracts/token/phased/PhaseTwoIsIndexed.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.11;

// NFTC Open Source Contracts See: https://github.com/NFTCulture/nftc-open-contracts
import '@nftculture/nftc-open-contracts/contracts/utility/AuxHelper32.sol';

// NFTC Prerelease Contracts
import '@nftculture/nftc-contract-library/contracts/whitelisting/MerkleLeaves.sol';

// NFTC Prerelease Libraries
import {MerkleClaimList} from '@nftculture/nftc-contract-library/contracts/whitelisting/MerkleClaimList.sol';

error IndexedProofInvalid_PhaseTwo();

/**
 * @title PhaseTwoIsIndexed
 */
abstract contract PhaseTwoIsIndexed is MerkleLeaves, AuxHelper32 {
    using MerkleClaimList for MerkleClaimList.Root;

    MerkleClaimList.Root private _phaseTwoRoot;

    constructor() {}

    function _setPhaseTwoRoot(bytes32 __root) internal {
        _phaseTwoRoot._setRoot(__root);
    }

    function checkProof_PhaseTwo(
        bytes32[] calldata proof,
        address wallet,
        uint256 index
    ) external view returns (bool) {
        return _phaseTwoRoot._checkLeaf(proof, _generateIndexedLeaf(wallet, index));
    }

    function getNextEntryIndex_PhaseTwo(address wallet) external view returns (uint256) {
        (, uint32 phaseTwoPurchases) = _unpack32(_getPackedPurchasesAs64(wallet));
        return phaseTwoPurchases;
    }

    function getTokensPurchased_PhaseTwo(address wallet) external view returns (uint32) {
        (, uint32 phaseTwoPurchases) = _unpack32(_getPackedPurchasesAs64(wallet));
        return phaseTwoPurchases;
    }

    function _getPackedPurchasesAs64(address wallet) internal view virtual returns (uint64);

    function _proofMintTokens_PhaseTwo(
        address minter,
        bytes32[] calldata proof,
        uint256 newBalance,
        uint256 count
    ) internal {
        // Verify proof matches expected target total number of indexed mints.
        if (!_phaseTwoRoot._checkLeaf(proof, _generateIndexedLeaf(minter, newBalance - 1))) {
            //Zero-based index.
            revert IndexedProofInvalid_PhaseTwo();
        }

        _internalMintTokens(minter, count);
    }

    function _internalMintTokens(address minter, uint256 count) internal virtual;

    function _proofMintTokensOfFlavor_PhaseTwo(
        address minter,
        bytes32[] calldata proof,
        uint256 newBalance,
        uint256 count,
        uint256 flavorId
    ) internal {
        // Verify proof matches expected target total number of indexed mints.
        if (!_phaseTwoRoot._checkLeaf(proof, _generateIndexedLeaf(minter, newBalance - 1))) {
            //Zero-based index.
            revert IndexedProofInvalid_PhaseTwo();
        }

        _internalMintTokens(minter, count, flavorId);
    }

    function _internalMintTokens(
        address minter,
        uint256 count,
        uint256 flavorId
    ) internal virtual;
}

// File: @nftculture/nftc-contract-library/contracts/token/phased/PhaseOneIsIndexed.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.11;

// NFTC Open Source Contracts See: https://github.com/NFTCulture/nftc-open-contracts
import '@nftculture/nftc-open-contracts/contracts/utility/AuxHelper32.sol';

// NFTC Prerelease Contracts
import '@nftculture/nftc-contract-library/contracts/whitelisting/MerkleLeaves.sol';

// NFTC Prerelease Libraries
import {MerkleClaimList} from '@nftculture/nftc-contract-library/contracts/whitelisting/MerkleClaimList.sol';

error IndexedProofInvalid_PhaseOne();

/**
 * @title PhaseOneIsIndexed
 */
abstract contract PhaseOneIsIndexed is MerkleLeaves, AuxHelper32 {
    using MerkleClaimList for MerkleClaimList.Root;

    MerkleClaimList.Root private _phaseOneRoot;

    constructor() {}

    /**
     * @dev Set the root of this merkle tree.
     */
    function _setPhaseOneRoot(bytes32 __root) internal {
        _phaseOneRoot._setRoot(__root);
    }

    function checkProof_PhaseOne(
        bytes32[] calldata proof,
        address wallet,
        uint256 index
    ) external view returns (bool) {
        return _phaseOneRoot._checkLeaf(proof, _generateIndexedLeaf(wallet, index));
    }

    function getNextEntryIndex_PhaseOne(address wallet) external view returns (uint256) {
        (uint32 phaseOnePurchases, ) = _unpack32(_getPackedPurchasesAs64(wallet));
        return phaseOnePurchases;
    }

    function getTokensPurchased_PhaseOne(address wallet) external view returns (uint32) {
        (uint32 phaseOnePurchases, ) = _unpack32(_getPackedPurchasesAs64(wallet));
        return phaseOnePurchases;
    }

    function _getPackedPurchasesAs64(address wallet) internal view virtual returns (uint64);

    function _proofMintTokens_PhaseOne(
        address minter,
        bytes32[] calldata proof,
        uint256 newBalance,
        uint256 count
    ) internal {
        // Verify proof matches expected target total number of indexed mints.
        if (!_phaseOneRoot._checkLeaf(proof, _generateIndexedLeaf(minter, newBalance - 1))) {
            //Zero-based index.
            revert IndexedProofInvalid_PhaseOne();
        }

        _internalMintTokens(minter, count);
    }

    function _internalMintTokens(address minter, uint256 count) internal virtual;

    function _proofMintTokensOfFlavor_PhaseOne(
        address minter,
        bytes32[] calldata proof,
        uint256 newBalance,
        uint256 count,
        uint256 flavorId
    ) internal {
        // Verify proof matches expected target total number of indexed mints.
        if (!_phaseOneRoot._checkLeaf(proof, _generateIndexedLeaf(minter, newBalance - 1))) {
            //Zero-based index.
            revert IndexedProofInvalid_PhaseOne();
        }

        _internalMintTokens(minter, count, flavorId);
    }

    function _internalMintTokens(
        address minter,
        uint256 count,
        uint256 flavorId
    ) internal virtual;
}

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



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

pragma solidity ^0.8.0;

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

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

// File: @nftculture/nftc-open-contracts/contracts/financial/SlimPaymentSplitter.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.11;

import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/Context.sol";

/**
 * @title SlimPaymentSplitter
 * @author @NiftyMike, NFT Culture
 * @dev A drop-in slim replacement version of OZ's Payment Splitter. All ERC-20 token functionality removed.
 *
 * Based on OpenZeppelin Contracts v4.4.1 (finance/PaymentSplitter.sol)
 */
contract SlimPaymentSplitter is Context {
    event PayeeAdded(address account, uint256 shares);
    event PaymentReleased(address to, uint256 amount);
    event PaymentReceived(address from, uint256 amount);
    event PayeeTransferred(address oldOwner, address newOwner);

    uint256 private _totalShares;
    uint256 private _totalReleased;

    mapping(address => uint256) private _shares;
    mapping(address => uint256) private _released;

    address[] private _payees;

    /**
     * @dev Creates an instance of `PaymentSplitter` where each account in `payees` is assigned the number of shares at
     * the matching position in the `shares` array.
     *
     * All addresses in `payees` must be non-zero. Both arrays must have the same non-zero length, and there must be no
     * duplicates in `payees`.
     */
    constructor(address[] memory payees, uint256[] memory shares_) payable {
        require(
            payees.length == shares_.length,
            "PaymentSplitter: payees and shares length mismatch"
        );
        require(payees.length > 0, "PaymentSplitter: no payees");

        for (uint256 i = 0; i < payees.length; i++) {
            _addPayee(payees[i], shares_[i]);
        }
    }

    /**
     * @dev The Ether received will be logged with {PaymentReceived} events. Note that these events are not fully
     * reliable: it's possible for a contract to receive Ether without triggering this function. This only affects the
     * reliability of the events, and not the actual splitting of Ether.
     *
     * To learn more about this see the Solidity documentation for
     * https://solidity.readthedocs.io/en/latest/contracts.html#fallback-function[fallback
     * functions].
     */
    receive() external payable virtual {
        emit PaymentReceived(_msgSender(), msg.value);
    }

    /**
     * @dev Getter for the total shares held by payees.
     */
    function totalShares() public view returns (uint256) {
        return _totalShares;
    }

    /**
     * @dev Getter for the total amount of Ether already released.
     */
    function totalReleased() public view returns (uint256) {
        return _totalReleased;
    }

    /**
     * @dev Getter for the amount of shares held by an account.
     */
    function shares(address account) public view returns (uint256) {
        return _shares[account];
    }

    /**
     * @dev Getter for the amount of Ether already released to a payee.
     */
    function released(address account) public view returns (uint256) {
        return _released[account];
    }

    /**
     * @dev Getter for the address of the payee number `index`.
     */
    function payee(uint256 index) public view returns (address) {
        return _payees[index];
    }

    /**
     * @dev Triggers a transfer to `account` of the amount of Ether they are owed, according to their percentage of the
     * total shares and their previous withdrawals.
     */
    function release(address payable account) public virtual {
        require(_shares[account] > 0, "PaymentSplitter: account has no shares");

        uint256 totalReceived = address(this).balance + totalReleased();
        uint256 payment = _pendingPayment(
            account,
            totalReceived,
            released(account)
        );

        require(payment != 0, "PaymentSplitter: account is not due payment");

        _released[account] += payment;
        _totalReleased += payment;

        Address.sendValue(account, payment);
        emit PaymentReleased(account, payment);
    }

    /**
     * @dev internal logic for computing the pending payment of an `account` given the token historical balances and
     * already released amounts.
     */
    function _pendingPayment(
        address account,
        uint256 totalReceived,
        uint256 alreadyReleased
    ) private view returns (uint256) {
        return
            (totalReceived * _shares[account]) / _totalShares - alreadyReleased;
    }

    /**
     * @dev Add a new payee to the contract.
     * @param account The address of the payee to add.
     * @param shares_ The number of shares owned by the payee.
     */
    function _addPayee(address account, uint256 shares_) private {
        require(
            account != address(0),
            "PaymentSplitter: account is the zero address"
        );
        require(shares_ > 0, "PaymentSplitter: shares are 0");
        require(
            _shares[account] == 0,
            "PaymentSplitter: account already has shares"
        );

        _payees.push(account);
        _shares[account] = shares_;
        _totalShares = _totalShares + shares_;
        emit PayeeAdded(account, shares_);
    }


    /**
     * @dev Allows owner to transfer their shares to somebody else; it can only be called by of a share.
     * @notice Owner: Release funds to a specific address.
     *
     * @param newOwner Payable address which has no shares and will receive the shares of the current owner.
     */
    function transferPayee(address payable newOwner) public {
        require(newOwner != address(0), "PaymentSplitter: New payee is the zero address.");
        require(_shares[msg.sender] > 0, "PaymentSplitter: You have no shares.");
        require(
            _shares[newOwner] == 0, // why not _shares[newOwner] ??
            "PaymentSplitter: New payee already has shares."
        );

        _transferPayee(newOwner);
        emit PayeeTransferred(msg.sender, newOwner);
    }

    function _transferPayee(address newOwner) private {
        if (_payees.length == 0) return;

        for (uint i = 0; i < _payees.length - 1; i++) {
            if (_payees[i] == msg.sender) {
                _payees[i] = newOwner;
                _shares[newOwner] = _shares[msg.sender];
                _shares[msg.sender] = 0;
            }
        }
    }
}

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



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

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

// File: erc721a/contracts/ERC721A.sol



// SPDX-License-Identifier: MIT
// ERC721A Contracts v4.2.3
// 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 {
    // Bypass for a `--via-ir` bug (https://github.com/chiru-labs/ERC721A/pull/364).
    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 payable 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 {
        _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].value`.
        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 payable 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 payable 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 payable 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.
            // The duplicated `log4` removes an extra check and reduces stack juggling.
            // The assembly, together with the surrounding Solidity code, have been
            // delicately arranged to nudge the compiler into producing optimized opcodes.
            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`.
                )

                // The `iszero(eq(,))` check ensures that large values of `quantity`
                // that overflows uint256 will make the loop run out of gas.
                // The compiler will optimize the `iszero` away for performance.
                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 str) {
        assembly {
            // The maximum value of a uint256 contains 78 digits (1 byte per digit), but
            // we allocate 0xa0 bytes to keep the free memory pointer 32-byte word aligned.
            // We will need 1 word for the trailing zeros padding, 1 word for the length,
            // and 3 words for a maximum of 78 digits. Total: 5 * 0x20 = 0xa0.
            let m := add(mload(0x40), 0xa0)
            // Update the free memory pointer to allocate.
            mstore(0x40, m)
            // Assign the `str` to the end.
            str := sub(m, 0x20)
            // Zeroize the slot after the string.
            mstore(str, 0)

            // Cache the end of the memory to calculate the length later.
            let end := str

            // We write the string from rightmost digit to leftmost digit.
            // The following is essentially a do-while loop that also handles the zero case.
            // prettier-ignore
            for { let temp := value } 1 {} {
                str := sub(str, 1)
                // Write the character to the pointer.
                // The ASCII index of the '0' character is 48.
                mstore8(str, add(48, mod(temp, 10)))
                // Keep dividing `temp` until zero.
                temp := div(temp, 10)
                // prettier-ignore
                if iszero(temp) { break }
            }

            let length := sub(end, str)
            // Move the pointer 32 bytes leftwards to make room for the length.
            str := sub(str, 0x20)
            // Store the length.
            mstore(str, length)
        }
    }
}

// File: @nftculture/nftc-contract-library/contracts/token/ExpandableTypedTokenExtension.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.11;

// OZ Libraries
import '@openzeppelin/contracts/access/AccessControl.sol';
import '@openzeppelin/contracts/utils/Strings.sol';

// Error Codes
error UnrecognizedFlavorId();
error InvalidValuePayment();
error InvalidAccess();
error CannotChangeMaxSupply();
error InvalidMaxSupply();
error ExceedsMaxSupplyForFlavor();

/**
 * @title ExpandableTypedTokenExtension
 * @author @NiftyMike | @NFTCulture
 * @dev Extension contract for Expandable Token Types.
 */
abstract contract ExpandableTypedTokenExtension is AccessControl {
    using Strings for uint256;

    bool private immutable ALLOW_MAX_SUPPLY_INCREASE;
    uint256 private _maxSupply;

    struct TokenFlavor {
        uint64 flavorId;
        uint64 price;
        uint64 maxSupply;
        uint64 totalMinted;
        string uriFragment;
    }

    // Storage for Token Flavors
    mapping(uint256 => TokenFlavor) private _tokenFlavors;

    bytes32 public constant CREATOR_ROLE = keccak256('CREATOR_ROLE');

    constructor(bool __allowMaxSupplyIncrease) {
        _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);

        // CREATOR_ROLE can create new flavors and update existing ones.
        _grantRole(CREATOR_ROLE, msg.sender);

        ALLOW_MAX_SUPPLY_INCREASE = __allowMaxSupplyIncrease;

        _initializeFlavors();
    }

    function _getInitialFlavors() internal virtual returns (TokenFlavor[] memory);

    function _initializeFlavors() private {
        TokenFlavor[] memory initialTokenFlavors = _getInitialFlavors();

        for (uint256 idx = 0; idx < initialTokenFlavors.length; idx++) {
            TokenFlavor memory current = initialTokenFlavors[idx];
            _maxSupply += current.maxSupply;
            _tokenFlavors[current.flavorId] = current;
        }
    }

    function createNewTokenFlavors(
        uint256[] memory __flavorIds,
        uint256[] memory __flavorPrices,
        uint256[] memory __flavorMaxSupplies,
        string[] memory __flavorUris
    ) external {
        if (!hasRole(CREATOR_ROLE, msg.sender)) revert InvalidAccess();

        require(
            __flavorIds.length == __flavorPrices.length &&
                __flavorIds.length == __flavorMaxSupplies.length &&
                __flavorIds.length == __flavorUris.length,
            'Unmatched arrays'
        );

        for (uint256 idx = 0; idx < __flavorIds.length; idx++) {
            TokenFlavor memory newFlavor = TokenFlavor(
                uint64(__flavorIds[idx]),
                uint64(__flavorPrices[idx]),
                uint64(__flavorMaxSupplies[idx]),
                0,
                __flavorUris[idx]
            );
            _maxSupply += newFlavor.maxSupply;
            _tokenFlavors[newFlavor.flavorId] = newFlavor;
        }
    }

    function updateTokenFlavor(
        uint256 __flavorId,
        uint256 __flavorPrice,
        uint256 __flavorMaxSupply,
        string memory __flavorUri
    ) external {
        if (!hasRole(CREATOR_ROLE, msg.sender)) revert InvalidAccess();
        if (__flavorMaxSupply != 0 && !ALLOW_MAX_SUPPLY_INCREASE) revert CannotChangeMaxSupply();

        TokenFlavor memory previousFlavor = _tokenFlavors[__flavorId];
        _checkFlavorIsValid(previousFlavor);

        if (__flavorPrice > 0) {
            previousFlavor.price = uint64(__flavorPrice);
        }

        if (__flavorMaxSupply > 0) {
            if (__flavorMaxSupply < previousFlavor.totalMinted) revert InvalidMaxSupply();

            _maxSupply += (__flavorMaxSupply - previousFlavor.maxSupply);
            previousFlavor.maxSupply = uint64(__flavorMaxSupply);
        }

        previousFlavor.flavorId = uint64(__flavorId); // This doesn't strictly need to be done, but doing it anyway.
        previousFlavor.uriFragment = __flavorUri;

        _tokenFlavors[__flavorId] = previousFlavor;
    }

    function _expandableMaxSupply() internal view returns (uint256) {
        return _maxSupply;
    }

    function _getTokenFlavor(uint256 flavorId) internal view returns (TokenFlavor memory) {
        return _tokenFlavors[flavorId];
    }

    function _saveTokenFlavor(TokenFlavor memory tokenFlavor) internal {
        _tokenFlavors[tokenFlavor.flavorId] = tokenFlavor;
    }

    function _getUriFragmentForToken(uint256 tokenId, TokenFlavor memory tokenFlavor)
        internal
        pure
        returns (string memory)
    {
        _checkFlavorIsValid(tokenFlavor);

        return string(abi.encodePacked(tokenFlavor.uriFragment, _tokenFilenameForFlavoredToken(tokenId)));
    }

    function _tokenFilenameForFlavoredToken(uint256 tokenId) internal pure returns (string memory) {
        // Special: Append the slash, so it looks like '/0'
        return string(abi.encodePacked('/', tokenId.toString()));
    }

    function _checkFlavorIsValid(TokenFlavor memory tokenFlavor) internal pure {
        if (tokenFlavor.flavorId == 0) revert UnrecognizedFlavorId();
    }

    function _checkValueIsValid(
        TokenFlavor memory tokenFlavor,
        uint256 count,
        uint256 valueSent
    ) internal pure {
        uint256 valueNeeded = tokenFlavor.price * count;
        if (valueSent != valueNeeded) revert InvalidValuePayment();
    }

    function _checkCountIsValid(TokenFlavor memory tokenFlavor, uint256 count) internal pure {
        if (tokenFlavor.maxSupply == 0) return; // Open Edition
        if (tokenFlavor.totalMinted + count > tokenFlavor.maxSupply) revert ExceedsMaxSupplyForFlavor();
    }
}

// File: erc721a/contracts/IERC721A.sol



// SPDX-License-Identifier: MIT
// ERC721A Contracts v4.2.3
// 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();

    /**
     * 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 payable;

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

    /**
     * @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 payable;

    /**
     * @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 payable;

    /**
     * @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);
}

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



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

pragma solidity ^0.8.0;

import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `_msgSender()` is missing `role`.
     * Overriding this function changes the behavior of the {onlyRole} modifier.
     *
     * Format of the revert message is described in {_checkRole}.
     *
     * _Available since v4.6._
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(uint160(account), 20),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * May emit a {RoleGranted} event.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// File: @openzeppelin/contracts/utils/introspection/ERC165.sol



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

pragma solidity ^0.8.0;

import "./IERC165.sol";

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

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

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



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

pragma solidity ^0.8.0;

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

// File: @nftculture/nftc-contract-library/contracts/token/phased/PhasedMintBase.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.11;

// NFTC Open Source Libraries See: https://github.com/NFTCulture/nftc-open-contracts
import {BooleanPacking} from '@nftculture/nftc-open-contracts/contracts/utility/BooleanPacking.sol';

// OZ Libraries
import '@openzeppelin/contracts/access/Ownable.sol';

/**
 * @title PhasedMintBase
 * @author @NiftyMike, NFT Culture
 * @dev PhasedMint: An approach to a standard system of controlling mint phases.
 */
abstract contract PhasedMintBase is Ownable {
    using BooleanPacking for uint256;

    // BooleanPacking used on _mintControlFlags
    uint256 internal _mintControlFlags;

    uint256 private immutable PUBLIC_MINT_PHASE;

    uint256 public publicMintPricePerNft;

    modifier isPublicMinting() {
        require(_mintControlFlags.getBoolean(PUBLIC_MINT_PHASE), 'Minting stopped');
        _;
    }

    constructor(uint256 publicMintPhase, uint256 __publicMintPricePerNft) {
        PUBLIC_MINT_PHASE = publicMintPhase;

        publicMintPricePerNft = __publicMintPricePerNft;
    }

    function _setMintingState(bool __publicMintingActive, uint256 __publicMintPricePerNft)
        internal
        returns (uint256)
    {
        uint256 tempControlFlags;

        tempControlFlags = tempControlFlags.setBoolean(PUBLIC_MINT_PHASE, __publicMintingActive);

        if (__publicMintPricePerNft > 0) {
            publicMintPricePerNft = __publicMintPricePerNft;
        }

        return tempControlFlags;
    }

    function isPublicMintingActive() external view returns (bool) {
        return _isPublicMintingActive();
    }

    function _isPublicMintingActive() internal view returns (bool) {
        return _mintControlFlags.getBoolean(PUBLIC_MINT_PHASE);
    }

    function supportedPhases() external view returns (uint256) {
        return PUBLIC_MINT_PHASE;
    }
}

// File: @nftculture/nftc-open-contracts/contracts/utility/BooleanPacking.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.11;

/**
 * @title BooleanPacking
 * @author @NiftyMike, NFT Culture
 * @dev Credit to Zimri Leijen
 * See https://ethereum.stackexchange.com/a/92235
 */
library BooleanPacking {
    function getBoolean(uint256 _packedBools, uint256 _columnNumber)
        internal
        pure
        returns (bool)
    {
        uint256 flag = (_packedBools >> _columnNumber) & uint256(1);
        return (flag == 1 ? true : false);
    }

    function setBoolean(
        uint256 _packedBools,
        uint256 _columnNumber,
        bool _value
    ) internal pure returns (uint256) {
        if (_value) {
            _packedBools = _packedBools | (uint256(1) << _columnNumber);
            return _packedBools;
        } else {
            _packedBools = _packedBools & ~(uint256(1) << _columnNumber);
            return _packedBools;
        }
    }
}

// File: @nftculture/nftc-open-contracts/contracts/utility/AuxHelper32.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.11;

/**
 * @title AuxHelper32
 * @author @NiftyMike | NFT Culture
 * @dev Helper class for ERC721a Aux storage, using 32 bit ints.
 */
abstract contract AuxHelper32 {
    function _pack32(uint32 left32, uint32 right32) internal pure returns (uint64) {
        return (uint64(left32) << 32) | uint32(right32);
    }

    function _unpack32(uint64 aux) internal pure returns (uint32 left32, uint32 right32) {
        return (uint32(aux >> 32), uint32(aux));
    }
}

// File: @nftculture/nftc-contract-library/contracts/whitelisting/MerkleLeaves.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.11;

/**
 * @title MerkleLeaves
 * @author @NiftyMike, NFT Culture
 * @dev Merkle Leaves for Merkle Trees - This is a companion contract to NFTC Labs' MerkleClaimList.sol library.
 * It provides leaf generation functions for both indexed and non-indexed merkle trees.
 * It also provides wrapper methods to expose the leaf generation functions to off-chain callers.
 *
 * Off-chain access is useful, because both the contract and the caller need to be able to generate the
 * leaves in a perfectly identical manner, so the generators are exposed to make it easier.
 */
abstract contract MerkleLeaves {
    /**
     * @notice External: generate a leaf for a wallet.
     *
     * @param wallet Address to hash.
     */
    function getLeafFor(address wallet) external pure returns (bytes32) {
        return _generateLeaf(wallet);
    }

    /**
     * @notice External: generate a leaf for a wallet and an embedded index value.
     *
     * @param wallet Address to hash.
     * @param index integer index to assign the leaf.
     */
    function getIndexedLeafFor(address wallet, uint256 index)
        external
        pure
        returns (bytes32)
    {
        return _generateIndexedLeaf(wallet, index);
    }

    /**
     * @dev Generate a merkle leaf based only on a wallet address. This is useful when all users
     * represented in the tree are eligible for the exact same thing, such as one free mint.
     *
     * A tiered system can be supported by this approach, by making seperate merkle trees and
     * mint functions per tier, but that approach will become ungainly if you have to support more
     * than a few tiers.
     */
    function _generateLeaf(address wallet) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked(wallet));
    }

    /**
     * @dev Generate a merkle leaf based on a wallet address and an index. This is useful when all
     * users represented in the tree are eligible for different amounts of something.
     */
    function _generateIndexedLeaf(address wallet, uint256 index)
        internal
        pure
        returns (bytes32)
    {
        return keccak256(abi.encodePacked(wallet, "_", index));
    }
}

// File: @nftculture/nftc-contract-library/contracts/whitelisting/MerkleClaimList.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.11;

import {MerkleRoot} from './MerkleRoot.sol';

/**
 * @title MerkleClaimList
 * @author @NiftyMike, NFT Culture
 * @dev Basic functionality for a MerkleTree that will be used as a "Claimlist"
 *
 * "Claimlist" - an approach for validating callers that is backed by a Merkle Tree.
 * Cheap to set the master claim, not that expensive to check the claim. Requires
 * off-chain generation of the Merkle Tree.
 *
 * This library allows you to declare a member variable like:
 * MerkleClaimList.Root private _claimRoot;
 *
 * The benefit of packaging this as a library, is that if you need multiple merkle trees in your
 * contract, you can declare multiple member variables using this library, and use them in similar fashion.
 *
 * see also: NFTC Labs' MerkleLeaves.sol, which is a companion abstract contract which contains helper
 * methods for generating leaves for the Merkle Tree.
 */
library MerkleClaimList {
    using MerkleRoot for bytes32;

    struct Root {
        // This variable should never be directly accessed by users of the library. See OZ comments in other libraries for more info.
        bytes32 _root;
    }

    /**
     * @dev Validate that a leaf is part of this merkle tree.
     */
    function _checkLeaf(
        Root storage root,
        bytes32[] calldata proof,
        bytes32 leaf
    ) internal view returns (bool) {
        return root._root.check(proof, leaf);
    }

    /**
     * @dev Set the root of this merkle tree.
     */
    function _setRoot(Root storage root, bytes32 __root) internal {
        root._root = __root;
    }
}

// File: @nftculture/nftc-contract-library/contracts/whitelisting/MerkleRoot.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.11;

import {MerkleProof} from '@openzeppelin/contracts/utils/cryptography/MerkleProof.sol';

/**
 * @title MerkleRoot
 * @author @NiftyMike, NFT Culture
 * @dev Companion library to OpenZeppelin's MerkleProof.
 * Allows you to abstract away merkle functionality a bit further, you now just need to
 * worry about dealing with your merkle root.
 *
 * Using this library allows you to treat bytes32 member variables as Merkle Roots, with a
 * slightly easier to use api then the OZ library.
 */
library MerkleRoot {
    using MerkleProof for bytes32[];

    function check(
        bytes32 root,
        bytes32[] calldata proof,
        bytes32 leaf
    ) internal pure returns (bool) {
        return proof.verify(root, leaf);
    }
}

// File: @openzeppelin/contracts/utils/cryptography/MerkleProof.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/cryptography/MerkleProof.sol)

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle Tree proofs.
 *
 * The proofs can be generated using the JavaScript library
 * https://github.com/miguelmota/merkletreejs[merkletreejs].
 * Note: the hashing algorithm should be keccak256 and pair sorting should be enabled.
 *
 * See `test/utils/cryptography/MerkleProof.test.js` for some examples.
 *
 * WARNING: You should avoid using leaf values that are 64 bytes long prior to
 * hashing, or use a hash function other than keccak256 for hashing leaves.
 * This is because the concatenation of a sorted pair of internal nodes in
 * the merkle tree could be reinterpreted as a leaf value.
 */
library MerkleProof {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(
        bytes32[] memory proof,
        bytes32 root,
        bytes32 leaf
    ) internal pure returns (bool) {
        return processProof(proof, leaf) == root;
    }

    /**
     * @dev Calldata version of {verify}
     *
     * _Available since v4.7._
     */
    function verifyCalldata(
        bytes32[] calldata proof,
        bytes32 root,
        bytes32 leaf
    ) internal pure returns (bool) {
        return processProofCalldata(proof, leaf) == root;
    }

    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merkle tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. When processing the proof, the pairs
     * of leafs & pre-images are assumed to be sorted.
     *
     * _Available since v4.4._
     */
    function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            computedHash = _hashPair(computedHash, proof[i]);
        }
        return computedHash;
    }

    /**
     * @dev Calldata version of {processProof}
     *
     * _Available since v4.7._
     */
    function processProofCalldata(bytes32[] calldata proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            computedHash = _hashPair(computedHash, proof[i]);
        }
        return computedHash;
    }

    /**
     * @dev Returns true if the `leaves` can be proved to be a part of a Merkle tree defined by
     * `root`, according to `proof` and `proofFlags` as described in {processMultiProof}.
     *
     * _Available since v4.7._
     */
    function multiProofVerify(
        bytes32[] memory proof,
        bool[] memory proofFlags,
        bytes32 root,
        bytes32[] memory leaves
    ) internal pure returns (bool) {
        return processMultiProof(proof, proofFlags, leaves) == root;
    }

    /**
     * @dev Calldata version of {multiProofVerify}
     *
     * _Available since v4.7._
     */
    function multiProofVerifyCalldata(
        bytes32[] calldata proof,
        bool[] calldata proofFlags,
        bytes32 root,
        bytes32[] memory leaves
    ) internal pure returns (bool) {
        return processMultiProofCalldata(proof, proofFlags, leaves) == root;
    }

    /**
     * @dev Returns the root of a tree reconstructed from `leaves` and the sibling nodes in `proof`,
     * consuming from one or the other at each step according to the instructions given by
     * `proofFlags`.
     *
     * _Available since v4.7._
     */
    function processMultiProof(
        bytes32[] memory proof,
        bool[] memory proofFlags,
        bytes32[] memory leaves
    ) internal pure returns (bytes32 merkleRoot) {
        // This function rebuild the root hash by traversing the tree up from the leaves. The root is rebuilt by
        // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the
        // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of
        // the merkle tree.
        uint256 leavesLen = leaves.length;
        uint256 totalHashes = proofFlags.length;

        // Check proof validity.
        require(leavesLen + proof.length - 1 == totalHashes, "MerkleProof: invalid multiproof");

        // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using
        // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop".
        bytes32[] memory hashes = new bytes32[](totalHashes);
        uint256 leafPos = 0;
        uint256 hashPos = 0;
        uint256 proofPos = 0;
        // At each step, we compute the next hash using two values:
        // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we
        //   get the next hash.
        // - depending on the flag, either another value for the "main queue" (merging branches) or an element from the
        //   `proof` array.
        for (uint256 i = 0; i < totalHashes; i++) {
            bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
            bytes32 b = proofFlags[i] ? leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++] : proof[proofPos++];
            hashes[i] = _hashPair(a, b);
        }

        if (totalHashes > 0) {
            return hashes[totalHashes - 1];
        } else if (leavesLen > 0) {
            return leaves[0];
        } else {
            return proof[0];
        }
    }

    /**
     * @dev Calldata version of {processMultiProof}
     *
     * _Available since v4.7._
     */
    function processMultiProofCalldata(
        bytes32[] calldata proof,
        bool[] calldata proofFlags,
        bytes32[] memory leaves
    ) internal pure returns (bytes32 merkleRoot) {
        // This function rebuild the root hash by traversing the tree up from the leaves. The root is rebuilt by
        // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the
        // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of
        // the merkle tree.
        uint256 leavesLen = leaves.length;
        uint256 totalHashes = proofFlags.length;

        // Check proof validity.
        require(leavesLen + proof.length - 1 == totalHashes, "MerkleProof: invalid multiproof");

        // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using
        // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop".
        bytes32[] memory hashes = new bytes32[](totalHashes);
        uint256 leafPos = 0;
        uint256 hashPos = 0;
        uint256 proofPos = 0;
        // At each step, we compute the next hash using two values:
        // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we
        //   get the next hash.
        // - depending on the flag, either another value for the "main queue" (merging branches) or an element from the
        //   `proof` array.
        for (uint256 i = 0; i < totalHashes; i++) {
            bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
            bytes32 b = proofFlags[i] ? leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++] : proof[proofPos++];
            hashes[i] = _hashPair(a, b);
        }

        if (totalHashes > 0) {
            return hashes[totalHashes - 1];
        } else if (leavesLen > 0) {
            return leaves[0];
        } else {
            return proof[0];
        }
    }

    function _hashPair(bytes32 a, bytes32 b) private pure returns (bytes32) {
        return a < b ? _efficientHash(a, b) : _efficientHash(b, a);
    }

    function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x00, a)
            mstore(0x20, b)
            value := keccak256(0x00, 0x40)
        }
    }
}

// File: @openzeppelin/contracts/token/common/ERC2981.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/common/ERC2981.sol)

pragma solidity ^0.8.0;

import "../../interfaces/IERC2981.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of the NFT Royalty Standard, a standardized way to retrieve royalty payment information.
 *
 * Royalty information can be specified globally for all token ids via {_setDefaultRoyalty}, and/or individually for
 * specific token ids via {_setTokenRoyalty}. The latter takes precedence over the first.
 *
 * Royalty is specified as a fraction of sale price. {_feeDenominator} is overridable but defaults to 10000, meaning the
 * fee is specified in basis points by default.
 *
 * IMPORTANT: ERC-2981 only specifies a way to signal royalty information and does not enforce its payment. See
 * https://eips.ethereum.org/EIPS/eip-2981#optional-royalty-payments[Rationale] in the EIP. Marketplaces are expected to
 * voluntarily pay royalties together with sales, but note that this standard is not yet widely supported.
 *
 * _Available since v4.5._
 */
abstract contract ERC2981 is IERC2981, ERC165 {
    struct RoyaltyInfo {
        address receiver;
        uint96 royaltyFraction;
    }

    RoyaltyInfo private _defaultRoyaltyInfo;
    mapping(uint256 => RoyaltyInfo) private _tokenRoyaltyInfo;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC165) returns (bool) {
        return interfaceId == type(IERC2981).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @inheritdoc IERC2981
     */
    function royaltyInfo(uint256 _tokenId, uint256 _salePrice) public view virtual override returns (address, uint256) {
        RoyaltyInfo memory royalty = _tokenRoyaltyInfo[_tokenId];

        if (royalty.receiver == address(0)) {
            royalty = _defaultRoyaltyInfo;
        }

        uint256 royaltyAmount = (_salePrice * royalty.royaltyFraction) / _feeDenominator();

        return (royalty.receiver, royaltyAmount);
    }

    /**
     * @dev The denominator with which to interpret the fee set in {_setTokenRoyalty} and {_setDefaultRoyalty} as a
     * fraction of the sale price. Defaults to 10000 so fees are expressed in basis points, but may be customized by an
     * override.
     */
    function _feeDenominator() internal pure virtual returns (uint96) {
        return 10000;
    }

    /**
     * @dev Sets the royalty information that all ids in this contract will default to.
     *
     * Requirements:
     *
     * - `receiver` cannot be the zero address.
     * - `feeNumerator` cannot be greater than the fee denominator.
     */
    function _setDefaultRoyalty(address receiver, uint96 feeNumerator) internal virtual {
        require(feeNumerator <= _feeDenominator(), "ERC2981: royalty fee will exceed salePrice");
        require(receiver != address(0), "ERC2981: invalid receiver");

        _defaultRoyaltyInfo = RoyaltyInfo(receiver, feeNumerator);
    }

    /**
     * @dev Removes default royalty information.
     */
    function _deleteDefaultRoyalty() internal virtual {
        delete _defaultRoyaltyInfo;
    }

    /**
     * @dev Sets the royalty information for a specific token id, overriding the global default.
     *
     * Requirements:
     *
     * - `receiver` cannot be the zero address.
     * - `feeNumerator` cannot be greater than the fee denominator.
     */
    function _setTokenRoyalty(
        uint256 tokenId,
        address receiver,
        uint96 feeNumerator
    ) internal virtual {
        require(feeNumerator <= _feeDenominator(), "ERC2981: royalty fee will exceed salePrice");
        require(receiver != address(0), "ERC2981: Invalid parameters");

        _tokenRoyaltyInfo[tokenId] = RoyaltyInfo(receiver, feeNumerator);
    }

    /**
     * @dev Resets royalty information for the token id back to the global default.
     */
    function _resetTokenRoyalty(uint256 tokenId) internal virtual {
        delete _tokenRoyaltyInfo[tokenId];
    }
}

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



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

pragma solidity ^0.8.0;

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

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