// SPDX-License-Identifier: MIT

// File: operator-filter-registry/src/lib/Constants.sol


pragma solidity ^0.8.13;

address constant CANONICAL_OPERATOR_FILTER_REGISTRY_ADDRESS = 0x000000000000AAeB6D7670E522A718067333cd4E;
address constant CANONICAL_CORI_SUBSCRIPTION = 0x3cc6CddA760b79bAfa08dF41ECFA224f810dCeB6;

// File: operator-filter-registry/src/IOperatorFilterRegistry.sol


pragma solidity ^0.8.13;

interface IOperatorFilterRegistry {
    /**
     * @notice Returns true if operator is not filtered for a given token, either by address or codeHash. Also returns
     *         true if supplied registrant address is not registered.
     */
    function isOperatorAllowed(address registrant, address operator) external view returns (bool);

    /**
     * @notice Registers an address with the registry. May be called by address itself or by EIP-173 owner.
     */
    function register(address registrant) external;

    /**
     * @notice Registers an address with the registry and "subscribes" to another address's filtered operators and codeHashes.
     */
    function registerAndSubscribe(address registrant, address subscription) external;

    /**
     * @notice Registers an address with the registry and copies the filtered operators and codeHashes from another
     *         address without subscribing.
     */
    function registerAndCopyEntries(address registrant, address registrantToCopy) external;

    /**
     * @notice Unregisters an address with the registry and removes its subscription. May be called by address itself or by EIP-173 owner.
     *         Note that this does not remove any filtered addresses or codeHashes.
     *         Also note that any subscriptions to this registrant will still be active and follow the existing filtered addresses and codehashes.
     */
    function unregister(address addr) external;

    /**
     * @notice Update an operator address for a registered address - when filtered is true, the operator is filtered.
     */
    function updateOperator(address registrant, address operator, bool filtered) external;

    /**
     * @notice Update multiple operators for a registered address - when filtered is true, the operators will be filtered. Reverts on duplicates.
     */
    function updateOperators(address registrant, address[] calldata operators, bool filtered) external;

    /**
     * @notice Update a codeHash for a registered address - when filtered is true, the codeHash is filtered.
     */
    function updateCodeHash(address registrant, bytes32 codehash, bool filtered) external;

    /**
     * @notice Update multiple codeHashes for a registered address - when filtered is true, the codeHashes will be filtered. Reverts on duplicates.
     */
    function updateCodeHashes(address registrant, bytes32[] calldata codeHashes, bool filtered) external;

    /**
     * @notice Subscribe an address to another registrant's filtered operators and codeHashes. Will remove previous
     *         subscription if present.
     *         Note that accounts with subscriptions may go on to subscribe to other accounts - in this case,
     *         subscriptions will not be forwarded. Instead the former subscription's existing entries will still be
     *         used.
     */
    function subscribe(address registrant, address registrantToSubscribe) external;

    /**
     * @notice Unsubscribe an address from its current subscribed registrant, and optionally copy its filtered operators and codeHashes.
     */
    function unsubscribe(address registrant, bool copyExistingEntries) external;

    /**
     * @notice Get the subscription address of a given registrant, if any.
     */
    function subscriptionOf(address addr) external returns (address registrant);

    /**
     * @notice Get the set of addresses subscribed to a given registrant.
     *         Note that order is not guaranteed as updates are made.
     */
    function subscribers(address registrant) external returns (address[] memory);

    /**
     * @notice Get the subscriber at a given index in the set of addresses subscribed to a given registrant.
     *         Note that order is not guaranteed as updates are made.
     */
    function subscriberAt(address registrant, uint256 index) external returns (address);

    /**
     * @notice Copy filtered operators and codeHashes from a different registrantToCopy to addr.
     */
    function copyEntriesOf(address registrant, address registrantToCopy) external;

    /**
     * @notice Returns true if operator is filtered by a given address or its subscription.
     */
    function isOperatorFiltered(address registrant, address operator) external returns (bool);

    /**
     * @notice Returns true if the hash of an address's code is filtered by a given address or its subscription.
     */
    function isCodeHashOfFiltered(address registrant, address operatorWithCode) external returns (bool);

    /**
     * @notice Returns true if a codeHash is filtered by a given address or its subscription.
     */
    function isCodeHashFiltered(address registrant, bytes32 codeHash) external returns (bool);

    /**
     * @notice Returns a list of filtered operators for a given address or its subscription.
     */
    function filteredOperators(address addr) external returns (address[] memory);

    /**
     * @notice Returns the set of filtered codeHashes for a given address or its subscription.
     *         Note that order is not guaranteed as updates are made.
     */
    function filteredCodeHashes(address addr) external returns (bytes32[] memory);

    /**
     * @notice Returns the filtered operator at the given index of the set of filtered operators for a given address or
     *         its subscription.
     *         Note that order is not guaranteed as updates are made.
     */
    function filteredOperatorAt(address registrant, uint256 index) external returns (address);

    /**
     * @notice Returns the filtered codeHash at the given index of the list of filtered codeHashes for a given address or
     *         its subscription.
     *         Note that order is not guaranteed as updates are made.
     */
    function filteredCodeHashAt(address registrant, uint256 index) external returns (bytes32);

    /**
     * @notice Returns true if an address has registered
     */
    function isRegistered(address addr) external returns (bool);

    /**
     * @dev Convenience method to compute the code hash of an arbitrary contract
     */
    function codeHashOf(address addr) external returns (bytes32);
}

// File: operator-filter-registry/src/OperatorFilterer.sol


pragma solidity ^0.8.13;


/**
 * @title  OperatorFilterer
 * @notice Abstract contract whose constructor automatically registers and optionally subscribes to or copies another
 *         registrant's entries in the OperatorFilterRegistry.
 * @dev    This smart contract is meant to be inherited by token contracts so they can use the following:
 *         - `onlyAllowedOperator` modifier for `transferFrom` and `safeTransferFrom` methods.
 *         - `onlyAllowedOperatorApproval` modifier for `approve` and `setApprovalForAll` methods.
 *         Please note that if your token contract does not provide an owner with EIP-173, it must provide
 *         administration methods on the contract itself to interact with the registry otherwise the subscription
 *         will be locked to the options set during construction.
 */

abstract contract OperatorFilterer {
    /// @dev Emitted when an operator is not allowed.
    error OperatorNotAllowed(address operator);

    IOperatorFilterRegistry public constant OPERATOR_FILTER_REGISTRY =
        IOperatorFilterRegistry(CANONICAL_OPERATOR_FILTER_REGISTRY_ADDRESS);

    /// @dev The constructor that is called when the contract is being deployed.
    constructor(address subscriptionOrRegistrantToCopy, bool subscribe) {
        // If an inheriting token contract is deployed to a network without the registry deployed, the modifier
        // will not revert, but the contract will need to be registered with the registry once it is deployed in
        // order for the modifier to filter addresses.
        if (address(OPERATOR_FILTER_REGISTRY).code.length > 0) {
            if (subscribe) {
                OPERATOR_FILTER_REGISTRY.registerAndSubscribe(address(this), subscriptionOrRegistrantToCopy);
            } else {
                if (subscriptionOrRegistrantToCopy != address(0)) {
                    OPERATOR_FILTER_REGISTRY.registerAndCopyEntries(address(this), subscriptionOrRegistrantToCopy);
                } else {
                    OPERATOR_FILTER_REGISTRY.register(address(this));
                }
            }
        }
    }

    /**
     * @dev A helper function to check if an operator is allowed.
     */
    modifier onlyAllowedOperator(address from) virtual {
        // Allow spending tokens from addresses with balance
        // Note that this still allows listings and marketplaces with escrow to transfer tokens if transferred
        // from an EOA.
        if (from != msg.sender) {
            _checkFilterOperator(msg.sender);
        }
        _;
    }

    /**
     * @dev A helper function to check if an operator approval is allowed.
     */
    modifier onlyAllowedOperatorApproval(address operator) virtual {
        _checkFilterOperator(operator);
        _;
    }

    /**
     * @dev A helper function to check if an operator is allowed.
     */
    function _checkFilterOperator(address operator) internal view virtual {
        // Check registry code length to facilitate testing in environments without a deployed registry.
        if (address(OPERATOR_FILTER_REGISTRY).code.length > 0) {
            // under normal circumstances, this function will revert rather than return false, but inheriting contracts
            // may specify their own OperatorFilterRegistry implementations, which may behave differently
            if (!OPERATOR_FILTER_REGISTRY.isOperatorAllowed(address(this), operator)) {
                revert OperatorNotAllowed(operator);
            }
        }
    }
}

// File: operator-filter-registry/src/DefaultOperatorFilterer.sol


pragma solidity ^0.8.13;


/**
 * @title  DefaultOperatorFilterer
 * @notice Inherits from OperatorFilterer and automatically subscribes to the default OpenSea subscription.
 * @dev    Please note that if your token contract does not provide an owner with EIP-173, it must provide
 *         administration methods on the contract itself to interact with the registry otherwise the subscription
 *         will be locked to the options set during construction.
 */

abstract contract DefaultOperatorFilterer is OperatorFilterer {
    /// @dev The constructor that is called when the contract is being deployed.
    constructor() OperatorFilterer(CANONICAL_CORI_SUBSCRIPTION, true) {}
}

// File: @openzeppelin/contracts/security/ReentrancyGuard.sol


// OpenZeppelin Contracts (last updated v4.8.0) (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() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// File: seadrop-main/src/lib/SeaDropStructs.sol


pragma solidity 0.8.17;

/**
 * @notice A struct defining public drop data.
 *         Designed to fit efficiently in one storage slot.
 * 
 * @param mintPrice                The mint price per token. (Up to 1.2m
 *                                 of native token, e.g. ETH, MATIC)
 * @param startTime                The start time, ensure this is not zero.
 * @param endTIme                  The end time, ensure this is not zero.
 * @param maxTotalMintableByWallet Maximum total number of mints a user is
 *                                 allowed. (The limit for this field is
 *                                 2^16 - 1)
 * @param feeBps                   Fee out of 10_000 basis points to be
 *                                 collected.
 * @param restrictFeeRecipients    If false, allow any fee recipient;
 *                                 if true, check fee recipient is allowed.
 */
struct PublicDrop {
    uint80 mintPrice; // 80/256 bits
    uint48 startTime; // 128/256 bits
    uint48 endTime; // 176/256 bits
    uint16 maxTotalMintableByWallet; // 224/256 bits
    uint16 feeBps; // 240/256 bits
    bool restrictFeeRecipients; // 248/256 bits
}

/**
 * @notice A struct defining token gated drop stage data.
 *         Designed to fit efficiently in one storage slot.
 * 
 * @param mintPrice                The mint price per token. (Up to 1.2m 
 *                                 of native token, e.g.: ETH, MATIC)
 * @param maxTotalMintableByWallet Maximum total number of mints a user is
 *                                 allowed. (The limit for this field is
 *                                 2^16 - 1)
 * @param startTime                The start time, ensure this is not zero.
 * @param endTime                  The end time, ensure this is not zero.
 * @param dropStageIndex           The drop stage index to emit with the event
 *                                 for analytical purposes. This should be 
 *                                 non-zero since the public mint emits
 *                                 with index zero.
 * @param maxTokenSupplyForStage   The limit of token supply this stage can
 *                                 mint within. (The limit for this field is
 *                                 2^16 - 1)
 * @param feeBps                   Fee out of 10_000 basis points to be
 *                                 collected.
 * @param restrictFeeRecipients    If false, allow any fee recipient;
 *                                 if true, check fee recipient is allowed.
 */
struct TokenGatedDropStage {
    uint80 mintPrice; // 80/256 bits
    uint16 maxTotalMintableByWallet; // 96/256 bits
    uint48 startTime; // 144/256 bits
    uint48 endTime; // 192/256 bits
    uint8 dropStageIndex; // non-zero. 200/256 bits
    uint32 maxTokenSupplyForStage; // 232/256 bits
    uint16 feeBps; // 248/256 bits
    bool restrictFeeRecipients; // 256/256 bits
}

/**
 * @notice A struct defining mint params for an allow list.
 *         An allow list leaf will be composed of `msg.sender` and
 *         the following params.
 * 
 *         Note: Since feeBps is encoded in the leaf, backend should ensure
 *         that feeBps is acceptable before generating a proof.
 * 
 * @param mintPrice                The mint price per token.
 * @param maxTotalMintableByWallet Maximum total number of mints a user is
 *                                 allowed.
 * @param startTime                The start time, ensure this is not zero.
 * @param endTime                  The end time, ensure this is not zero.
 * @param dropStageIndex           The drop stage index to emit with the event
 *                                 for analytical purposes. This should be
 *                                 non-zero since the public mint emits with
 *                                 index zero.
 * @param maxTokenSupplyForStage   The limit of token supply this stage can
 *                                 mint within.
 * @param feeBps                   Fee out of 10_000 basis points to be
 *                                 collected.
 * @param restrictFeeRecipients    If false, allow any fee recipient;
 *                                 if true, check fee recipient is allowed.
 */
struct MintParams {
    uint256 mintPrice; 
    uint256 maxTotalMintableByWallet;
    uint256 startTime;
    uint256 endTime;
    uint256 dropStageIndex; // non-zero
    uint256 maxTokenSupplyForStage;
    uint256 feeBps;
    bool restrictFeeRecipients;
}

/**
 * @notice A struct defining token gated mint params.
 * 
 * @param allowedNftToken    The allowed nft token contract address.
 * @param allowedNftTokenIds The token ids to redeem.
 */
struct TokenGatedMintParams {
    address allowedNftToken;
    uint256[] allowedNftTokenIds;
}

/**
 * @notice A struct defining allow list data (for minting an allow list).
 * 
 * @param merkleRoot    The merkle root for the allow list.
 * @param publicKeyURIs If the allowListURI is encrypted, a list of URIs
 *                      pointing to the public keys. Empty if unencrypted.
 * @param allowListURI  The URI for the allow list.
 */
struct AllowListData {
    bytes32 merkleRoot;
    string[] publicKeyURIs;
    string allowListURI;
}

/**
 * @notice A struct defining minimum and maximum parameters to validate for 
 *         signed mints, to minimize negative effects of a compromised signer.
 *
 * @param minMintPrice                The minimum mint price allowed.
 * @param maxMaxTotalMintableByWallet The maximum total number of mints allowed
 *                                    by a wallet.
 * @param minStartTime                The minimum start time allowed.
 * @param maxEndTime                  The maximum end time allowed.
 * @param maxMaxTokenSupplyForStage   The maximum token supply allowed.
 * @param minFeeBps                   The minimum fee allowed.
 * @param maxFeeBps                   The maximum fee allowed.
 */
struct SignedMintValidationParams {
    uint80 minMintPrice; // 80/256 bits
    uint24 maxMaxTotalMintableByWallet; // 104/256 bits
    uint40 minStartTime; // 144/256 bits
    uint40 maxEndTime; // 184/256 bits
    uint40 maxMaxTokenSupplyForStage; // 224/256 bits
    uint16 minFeeBps; // 240/256 bits
    uint16 maxFeeBps; // 256/256 bits
}
// File: seadrop-main/src/lib/ERC721SeaDropStructsErrorsAndEvents.sol


pragma solidity 0.8.17;


interface ERC721SeaDropStructsErrorsAndEvents {
  /**
   * @notice Revert with an error if mint exceeds the max supply.
   */
  error MintQuantityExceedsMaxSupply(uint256 total, uint256 maxSupply);

  /**
   * @notice Revert with an error if the number of token gated 
   *         allowedNftTokens doesn't match the length of supplied
   *         drop stages.
   */
  error TokenGatedMismatch();

  /**
   *  @notice Revert with an error if the number of signers doesn't match
   *          the length of supplied signedMintValidationParams
   */
  error SignersMismatch();

  /**
   * @notice An event to signify that a SeaDrop token contract was deployed.
   */
  event SeaDropTokenDeployed();

  /**
   * @notice A struct to configure multiple contract options at a time.
   */
  struct MultiConfigureStruct {
    uint256 maxSupply;
    string baseURI;
    string contractURI;
    address seaDropImpl;
    PublicDrop publicDrop;
    string dropURI;
    AllowListData allowListData;
    address creatorPayoutAddress;
    bytes32 provenanceHash;

    address[] allowedFeeRecipients;
    address[] disallowedFeeRecipients;

    address[] allowedPayers;
    address[] disallowedPayers;

    // Token-gated
    address[] tokenGatedAllowedNftTokens;
    TokenGatedDropStage[] tokenGatedDropStages;
    address[] disallowedTokenGatedAllowedNftTokens;

    // Server-signed
    address[] signers;
    SignedMintValidationParams[] signedMintValidationParams;
    address[] disallowedSigners;
  }
}
// File: seadrop-main/src/lib/SeaDropErrorsAndEvents.sol


pragma solidity 0.8.17;


interface SeaDropErrorsAndEvents {
    /**
     * @dev Revert with an error if the drop stage is not active.
     */
    error NotActive(
        uint256 currentTimestamp,
        uint256 startTimestamp,
        uint256 endTimestamp
    );

    /**
     * @dev Revert with an error if the mint quantity is zero.
     */
    error MintQuantityCannotBeZero();

    /**
     * @dev Revert with an error if the mint quantity exceeds the max allowed
     *      to be minted per wallet.
     */
    error MintQuantityExceedsMaxMintedPerWallet(uint256 total, uint256 allowed);

    /**
     * @dev Revert with an error if the mint quantity exceeds the max token
     *      supply.
     */
    error MintQuantityExceedsMaxSupply(uint256 total, uint256 maxSupply);

    /**
     * @dev Revert with an error if the mint quantity exceeds the max token
     *      supply for the stage.
     *      Note: The `maxTokenSupplyForStage` for public mint is
     *      always `type(uint).max`.
     */
    error MintQuantityExceedsMaxTokenSupplyForStage(
        uint256 total, 
        uint256 maxTokenSupplyForStage
    );
    
    /**
     * @dev Revert if the fee recipient is the zero address.
     */
    error FeeRecipientCannotBeZeroAddress();

    /**
     * @dev Revert if the fee recipient is not already included.
     */
    error FeeRecipientNotPresent();

    /**
     * @dev Revert if the fee basis points is greater than 10_000.
     */
    error InvalidFeeBps(uint256 feeBps);

    /**
     * @dev Revert if the fee recipient is already included.
     */
    error DuplicateFeeRecipient();

    /**
     * @dev Revert if the fee recipient is restricted and not allowed.
     */
    error FeeRecipientNotAllowed();

    /**
     * @dev Revert if the creator payout address is the zero address.
     */
    error CreatorPayoutAddressCannotBeZeroAddress();

    /**
     * @dev Revert with an error if the received payment is incorrect.
     */
    error IncorrectPayment(uint256 got, uint256 want);

    /**
     * @dev Revert with an error if the allow list proof is invalid.
     */
    error InvalidProof();

    /**
     * @dev Revert if a supplied signer address is the zero address.
     */
    error SignerCannotBeZeroAddress();

    /**
     * @dev Revert with an error if signer's signature is invalid.
     */
    error InvalidSignature(address recoveredSigner);

    /**
     * @dev Revert with an error if a signer is not included in
     *      the enumeration when removing.
     */
    error SignerNotPresent();

    /**
     * @dev Revert with an error if a payer is not included in
     *      the enumeration when removing.
     */
    error PayerNotPresent();

    /**
     * @dev Revert with an error if a payer is already included in mapping
     *      when adding.
     *      Note: only applies when adding a single payer, as duplicates in
     *      enumeration can be removed with updatePayer.
     */
    error DuplicatePayer();

    /**
     * @dev Revert with an error if the payer is not allowed. The minter must
     *      pay for their own mint.
     */
    error PayerNotAllowed();

    /**
     * @dev Revert if a supplied payer address is the zero address.
     */
    error PayerCannotBeZeroAddress();

    /**
     * @dev Revert with an error if the sender does not
     *      match the INonFungibleSeaDropToken interface.
     */
    error OnlyINonFungibleSeaDropToken(address sender);

    /**
     * @dev Revert with an error if the sender of a token gated supplied
     *      drop stage redeem is not the owner of the token.
     */
    error TokenGatedNotTokenOwner(
        address nftContract,
        address allowedNftToken,
        uint256 allowedNftTokenId
    );

    /**
     * @dev Revert with an error if the token id has already been used to
     *      redeem a token gated drop stage.
     */
    error TokenGatedTokenIdAlreadyRedeemed(
        address nftContract,
        address allowedNftToken,
        uint256 allowedNftTokenId
    );

    /**
     * @dev Revert with an error if an empty TokenGatedDropStage is provided
     *      for an already-empty TokenGatedDropStage.
     */
     error TokenGatedDropStageNotPresent();

    /**
     * @dev Revert with an error if an allowedNftToken is set to
     *      the zero address.
     */
     error TokenGatedDropAllowedNftTokenCannotBeZeroAddress();

    /**
     * @dev Revert with an error if an allowedNftToken is set to
     *      the drop token itself.
     */
     error TokenGatedDropAllowedNftTokenCannotBeDropToken();


    /**
     * @dev Revert with an error if supplied signed mint price is less than
     *      the minimum specified.
     */
    error InvalidSignedMintPrice(uint256 got, uint256 minimum);

    /**
     * @dev Revert with an error if supplied signed maxTotalMintableByWallet
     *      is greater than the maximum specified.
     */
    error InvalidSignedMaxTotalMintableByWallet(uint256 got, uint256 maximum);

    /**
     * @dev Revert with an error if supplied signed start time is less than
     *      the minimum specified.
     */
    error InvalidSignedStartTime(uint256 got, uint256 minimum);
    
    /**
     * @dev Revert with an error if supplied signed end time is greater than
     *      the maximum specified.
     */
    error InvalidSignedEndTime(uint256 got, uint256 maximum);

    /**
     * @dev Revert with an error if supplied signed maxTokenSupplyForStage
     *      is greater than the maximum specified.
     */
     error InvalidSignedMaxTokenSupplyForStage(uint256 got, uint256 maximum);
    
     /**
     * @dev Revert with an error if supplied signed feeBps is greater than
     *      the maximum specified, or less than the minimum.
     */
    error InvalidSignedFeeBps(uint256 got, uint256 minimumOrMaximum);

    /**
     * @dev Revert with an error if signed mint did not specify to restrict
     *      fee recipients.
     */
    error SignedMintsMustRestrictFeeRecipients();

    /**
     * @dev Revert with an error if a signature for a signed mint has already
     *      been used.
     */
    error SignatureAlreadyUsed();

    /**
     * @dev An event with details of a SeaDrop mint, for analytical purposes.
     * 
     * @param nftContract    The nft contract.
     * @param minter         The mint recipient.
     * @param feeRecipient   The fee recipient.
     * @param payer          The address who payed for the tx.
     * @param quantityMinted The number of tokens minted.
     * @param unitMintPrice  The amount paid for each token.
     * @param feeBps         The fee out of 10_000 basis points collected.
     * @param dropStageIndex The drop stage index. Items minted
     *                       through mintPublic() have
     *                       dropStageIndex of 0.
     */
    event SeaDropMint(
        address indexed nftContract,
        address indexed minter,
        address indexed feeRecipient,
        address payer,
        uint256 quantityMinted,
        uint256 unitMintPrice,
        uint256 feeBps,
        uint256 dropStageIndex
    );

    /**
     * @dev An event with updated public drop data for an nft contract.
     */
    event PublicDropUpdated(
        address indexed nftContract,
        PublicDrop publicDrop
    );

    /**
     * @dev An event with updated token gated drop stage data
     *      for an nft contract.
     */
    event TokenGatedDropStageUpdated(
        address indexed nftContract,
        address indexed allowedNftToken,
        TokenGatedDropStage dropStage
    );

    /**
     * @dev An event with updated allow list data for an nft contract.
     * 
     * @param nftContract        The nft contract.
     * @param previousMerkleRoot The previous allow list merkle root.
     * @param newMerkleRoot      The new allow list merkle root.
     * @param publicKeyURI       If the allow list is encrypted, the public key
     *                           URIs that can decrypt the list.
     *                           Empty if unencrypted.
     * @param allowListURI       The URI for the allow list.
     */
    event AllowListUpdated(
        address indexed nftContract,
        bytes32 indexed previousMerkleRoot,
        bytes32 indexed newMerkleRoot,
        string[] publicKeyURI,
        string allowListURI
    );

    /**
     * @dev An event with updated drop URI for an nft contract.
     */
    event DropURIUpdated(address indexed nftContract, string newDropURI);

    /**
     * @dev An event with the updated creator payout address for an nft
     *      contract.
     */
    event CreatorPayoutAddressUpdated(
        address indexed nftContract,
        address indexed newPayoutAddress
    );

    /**
     * @dev An event with the updated allowed fee recipient for an nft
     *      contract.
     */
    event AllowedFeeRecipientUpdated(
        address indexed nftContract,
        address indexed feeRecipient,
        bool indexed allowed
    );

    /**
     * @dev An event with the updated validation parameters for server-side
     *      signers.
     */
    event SignedMintValidationParamsUpdated(
        address indexed nftContract,
        address indexed signer,
        SignedMintValidationParams signedMintValidationParams
    );   

    /**
     * @dev An event with the updated payer for an nft contract.
     */
    event PayerUpdated(
        address indexed nftContract,
        address indexed payer,
        bool indexed allowed
    );
}

// File: seadrop-main/src/interfaces/ISeaDrop.sol


pragma solidity 0.8.17;



interface ISeaDrop is SeaDropErrorsAndEvents {
    /**
     * @notice Mint a public drop.
     *
     * @param nftContract      The nft contract to mint.
     * @param feeRecipient     The fee recipient.
     * @param minterIfNotPayer The mint recipient if different than the payer.
     * @param quantity         The number of tokens to mint.
     */
    function mintPublic(
        address nftContract,
        address feeRecipient,
        address minterIfNotPayer,
        uint256 quantity
    ) external payable;

    /**
     * @notice Mint from an allow list.
     *
     * @param nftContract      The nft contract to mint.
     * @param feeRecipient     The fee recipient.
     * @param minterIfNotPayer The mint recipient if different than the payer.
     * @param quantity         The number of tokens to mint.
     * @param mintParams       The mint parameters.
     * @param proof            The proof for the leaf of the allow list.
     */
    function mintAllowList(
        address nftContract,
        address feeRecipient,
        address minterIfNotPayer,
        uint256 quantity,
        MintParams calldata mintParams,
        bytes32[] calldata proof
    ) external payable;

    /**
     * @notice Mint with a server-side signature.
     *         Note that a signature can only be used once.
     *
     * @param nftContract      The nft contract to mint.
     * @param feeRecipient     The fee recipient.
     * @param minterIfNotPayer The mint recipient if different than the payer.
     * @param quantity         The number of tokens to mint.
     * @param mintParams       The mint parameters.
     * @param salt             The sale for the signed mint.
     * @param signature        The server-side signature, must be an allowed
     *                         signer.
     */
    function mintSigned(
        address nftContract,
        address feeRecipient,
        address minterIfNotPayer,
        uint256 quantity,
        MintParams calldata mintParams,
        uint256 salt,
        bytes calldata signature
    ) external payable;

    /**
     * @notice Mint as an allowed token holder.
     *         This will mark the token id as redeemed and will revert if the
     *         same token id is attempted to be redeemed twice.
     *
     * @param nftContract      The nft contract to mint.
     * @param feeRecipient     The fee recipient.
     * @param minterIfNotPayer The mint recipient if different than the payer.
     * @param mintParams       The token gated mint params.
     */
    function mintAllowedTokenHolder(
        address nftContract,
        address feeRecipient,
        address minterIfNotPayer,
        TokenGatedMintParams calldata mintParams
    ) external payable;

    /**
     * @notice Emits an event to notify update of the drop URI.
     *
     *         This method assume msg.sender is an nft contract and its
     *         ERC165 interface id matches INonFungibleSeaDropToken.
     *
     *         Note: Be sure only authorized users can call this from
     *         token contracts that implement INonFungibleSeaDropToken.
     *
     * @param dropURI The new drop URI.
     */
    function updateDropURI(string calldata dropURI) external;

    /**
     * @notice Updates the public drop data for the nft contract
     *         and emits an event.
     *
     *         This method assume msg.sender is an nft contract and its
     *         ERC165 interface id matches INonFungibleSeaDropToken.
     *
     *         Note: Be sure only authorized users can call this from
     *         token contracts that implement INonFungibleSeaDropToken.
     *
     * @param publicDrop The public drop data.
     */
    function updatePublicDrop(PublicDrop calldata publicDrop) external;

    /**
     * @notice Updates the allow list merkle root for the nft contract
     *         and emits an event.
     *
     *         This method assume msg.sender is an nft contract and its
     *         ERC165 interface id matches INonFungibleSeaDropToken.
     *
     *         Note: Be sure only authorized users can call this from
     *         token contracts that implement INonFungibleSeaDropToken.
     *
     * @param allowListData The allow list data.
     */
    function updateAllowList(AllowListData calldata allowListData) external;

    /**
     * @notice Updates the token gated drop stage for the nft contract
     *         and emits an event.
     *
     *         This method assume msg.sender is an nft contract and its
     *         ERC165 interface id matches INonFungibleSeaDropToken.
     *
     *         Note: Be sure only authorized users can call this from
     *         token contracts that implement INonFungibleSeaDropToken.
     *
     *         Note: If two INonFungibleSeaDropToken tokens are doing
     *         simultaneous token gated drop promotions for each other,
     *         they can be minted by the same actor until
     *         `maxTokenSupplyForStage` is reached. Please ensure the
     *         `allowedNftToken` is not running an active drop during
     *         the `dropStage` time period.
     *
     * @param allowedNftToken The token gated nft token.
     * @param dropStage       The token gated drop stage data.
     */
    function updateTokenGatedDrop(
        address allowedNftToken,
        TokenGatedDropStage calldata dropStage
    ) external;

    /**
     * @notice Updates the creator payout address and emits an event.
     *
     *         This method assume msg.sender is an nft contract and its
     *         ERC165 interface id matches INonFungibleSeaDropToken.
     *
     *         Note: Be sure only authorized users can call this from
     *         token contracts that implement INonFungibleSeaDropToken.
     *
     * @param payoutAddress The creator payout address.
     */
    function updateCreatorPayoutAddress(address payoutAddress) external;

    /**
     * @notice Updates the allowed fee recipient and emits an event.
     *
     *         This method assume msg.sender is an nft contract and its
     *         ERC165 interface id matches INonFungibleSeaDropToken.
     *
     *         Note: Be sure only authorized users can call this from
     *         token contracts that implement INonFungibleSeaDropToken.
     *
     * @param feeRecipient The fee recipient.
     * @param allowed      If the fee recipient is allowed.
     */
    function updateAllowedFeeRecipient(address feeRecipient, bool allowed)
        external;

    /**
     * @notice Updates the allowed server-side signers and emits an event.
     *
     *         This method assume msg.sender is an nft contract and its
     *         ERC165 interface id matches INonFungibleSeaDropToken.
     *
     *         Note: Be sure only authorized users can call this from
     *         token contracts that implement INonFungibleSeaDropToken.
     *
     * @param signer                     The signer to update.
     * @param signedMintValidationParams Minimum and maximum parameters
     *                                   to enforce for signed mints.
     */
    function updateSignedMintValidationParams(
        address signer,
        SignedMintValidationParams calldata signedMintValidationParams
    ) external;

    /**
     * @notice Updates the allowed payer and emits an event.
     *
     *         This method assume msg.sender is an nft contract and its
     *         ERC165 interface id matches INonFungibleSeaDropToken.
     *
     *         Note: Be sure only authorized users can call this from
     *         token contracts that implement INonFungibleSeaDropToken.
     *
     * @param payer   The payer to add or remove.
     * @param allowed Whether to add or remove the payer.
     */
    function updatePayer(address payer, bool allowed) external;

    /**
     * @notice Returns the public drop data for the nft contract.
     *
     * @param nftContract The nft contract.
     */
    function getPublicDrop(address nftContract)
        external
        view
        returns (PublicDrop memory);

    /**
     * @notice Returns the creator payout address for the nft contract.
     *
     * @param nftContract The nft contract.
     */
    function getCreatorPayoutAddress(address nftContract)
        external
        view
        returns (address);

    /**
     * @notice Returns the allow list merkle root for the nft contract.
     *
     * @param nftContract The nft contract.
     */
    function getAllowListMerkleRoot(address nftContract)
        external
        view
        returns (bytes32);

    /**
     * @notice Returns if the specified fee recipient is allowed
     *         for the nft contract.
     *
     * @param nftContract  The nft contract.
     * @param feeRecipient The fee recipient.
     */
    function getFeeRecipientIsAllowed(address nftContract, address feeRecipient)
        external
        view
        returns (bool);

    /**
     * @notice Returns an enumeration of allowed fee recipients for an
     *         nft contract when fee recipients are enforced
     *
     * @param nftContract The nft contract.
     */
    function getAllowedFeeRecipients(address nftContract)
        external
        view
        returns (address[] memory);

    /**
     * @notice Returns the server-side signers for the nft contract.
     *
     * @param nftContract The nft contract.
     */
    function getSigners(address nftContract)
        external
        view
        returns (address[] memory);

    /**
     * @notice Returns the struct of SignedMintValidationParams for a signer.
     *
     * @param nftContract The nft contract.
     * @param signer      The signer.
     */
    function getSignedMintValidationParams(address nftContract, address signer)
        external
        view
        returns (SignedMintValidationParams memory);

    /**
     * @notice Returns the payers for the nft contract.
     *
     * @param nftContract The nft contract.
     */
    function getPayers(address nftContract)
        external
        view
        returns (address[] memory);

    /**
     * @notice Returns if the specified payer is allowed
     *         for the nft contract.
     *
     * @param nftContract The nft contract.
     * @param payer       The payer.
     */
    function getPayerIsAllowed(address nftContract, address payer)
        external
        view
        returns (bool);

    /**
     * @notice Returns the allowed token gated drop tokens for the nft contract.
     *
     * @param nftContract The nft contract.
     */
    function getTokenGatedAllowedTokens(address nftContract)
        external
        view
        returns (address[] memory);

    /**
     * @notice Returns the token gated drop data for the nft contract
     *         and token gated nft.
     *
     * @param nftContract     The nft contract.
     * @param allowedNftToken The token gated nft token.
     */
    function getTokenGatedDrop(address nftContract, address allowedNftToken)
        external
        view
        returns (TokenGatedDropStage memory);

    /**
     * @notice Returns whether the token id for a token gated drop has been
     *         redeemed.
     *
     * @param nftContract       The nft contract.
     * @param allowedNftToken   The token gated nft token.
     * @param allowedNftTokenId The token gated nft token id to check.
     */
    function getAllowedNftTokenIdIsRedeemed(
        address nftContract,
        address allowedNftToken,
        uint256 allowedNftTokenId
    ) external view returns (bool);
}

// File: @openzeppelin/contracts/utils/Context.sol


// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: @openzeppelin/contracts/access/Ownable2Step.sol


// OpenZeppelin Contracts (last updated v4.8.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.0;


/**
 * @dev Contract module which provides 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} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2Step is Ownable {
    address private _pendingOwner;

    event OwnershipTransferStarted(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Returns the address of the pending owner.
     */
    function pendingOwner() public view virtual returns (address) {
        return _pendingOwner;
    }

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() external {
        address sender = _msgSender();
        require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner");
        _transferOwnership(sender);
    }
}

// File: erc721a/contracts/IERC721A.sol


// 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: erc721a/contracts/ERC721A.sol


// ERC721A Contracts v4.2.3
// Creator: Chiru Labs

pragma solidity ^0.8.4;


/**
 * @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: @openzeppelin/contracts/utils/introspection/IERC165.sol


// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// File: @openzeppelin/contracts/utils/introspection/ERC165.sol


// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;


/**
 * @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/interfaces/IERC2981.sol


// OpenZeppelin Contracts (last updated v4.6.0) (interfaces/IERC2981.sol)

pragma solidity ^0.8.0;


/**
 * @dev Interface for the NFT Royalty Standard.
 *
 * A standardized way to retrieve royalty payment information for non-fungible tokens (NFTs) to enable universal
 * support for royalty payments across all NFT marketplaces and ecosystem participants.
 *
 * _Available since v4.5._
 */
interface IERC2981 is IERC165 {
    /**
     * @dev Returns how much royalty is owed and to whom, based on a sale price that may be denominated in any unit of
     * exchange. The royalty amount is denominated and should be paid in that same unit of exchange.
     */
    function royaltyInfo(uint256 tokenId, uint256 salePrice)
        external
        view
        returns (address receiver, uint256 royaltyAmount);
}

// File: @openzeppelin/contracts/token/common/ERC2981.sol


// OpenZeppelin Contracts (last updated v4.7.0) (token/common/ERC2981.sol)

pragma solidity ^0.8.0;



/**
 * @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: seadrop-main/src/interfaces/ISeaDropTokenContractMetadata.sol


pragma solidity 0.8.17;


interface ISeaDropTokenContractMetadata is IERC2981 {
    /**
     * @notice Throw if the max supply exceeds uint64, a limit
     *         due to the storage of bit-packed variables in ERC721A.
     */
    error CannotExceedMaxSupplyOfUint64(uint256 newMaxSupply);

    /**
     * @dev Revert with an error when attempting to set the provenance
     *      hash after the mint has started.
     */
    error ProvenanceHashCannotBeSetAfterMintStarted();

    /**
     * @dev Revert if the royalty basis points is greater than 10_000.
     */
    error InvalidRoyaltyBasisPoints(uint256 basisPoints);

    /**
     * @dev Revert if the royalty address is being set to the zero address.
     */
    error RoyaltyAddressCannotBeZeroAddress();

    /**
     * @dev Emit an event for token metadata reveals/updates,
     *      according to EIP-4906.
     *
     * @param _fromTokenId The start token id.
     * @param _toTokenId   The end token id.
     */
    event BatchMetadataUpdate(uint256 _fromTokenId, uint256 _toTokenId);

    /**
     * @dev Emit an event when the URI for the collection-level metadata
     *      is updated.
     */
    event ContractURIUpdated(string newContractURI);

    /**
     * @dev Emit an event when the max token supply is updated.
     */
    event MaxSupplyUpdated(uint256 newMaxSupply);

    /**
     * @dev Emit an event with the previous and new provenance hash after
     *      being updated.
     */
    event ProvenanceHashUpdated(bytes32 previousHash, bytes32 newHash);

    /**
     * @dev Emit an event when the royalties info is updated.
     */
    event RoyaltyInfoUpdated(address receiver, uint256 bps);

    /**
     * @notice A struct defining royalty info for the contract.
     */
    struct RoyaltyInfo {
        address royaltyAddress;
        uint96 royaltyBps;
    }

    /**
     * @notice Sets the base URI for the token metadata and emits an event.
     *
     * @param tokenURI The new base URI to set.
     */
    function setBaseURI(string calldata tokenURI) external;

    /**
     * @notice Sets the contract URI for contract metadata.
     *
     * @param newContractURI The new contract URI.
     */
    function setContractURI(string calldata newContractURI) external;

    /**
     * @notice Sets the max supply and emits an event.
     *
     * @param newMaxSupply The new max supply to set.
     */
    function setMaxSupply(uint256 newMaxSupply) external;

    /**
     * @notice Sets the provenance hash and emits an event.
     *
     *         The provenance hash is used for random reveals, which
     *         is a hash of the ordered metadata to show it has not been
     *         modified after mint started.
     *
     *         This function will revert after the first item has been minted.
     *
     * @param newProvenanceHash The new provenance hash to set.
     */
    function setProvenanceHash(bytes32 newProvenanceHash) external;

    /**
     * @notice Sets the address and basis points for royalties.
     *
     * @param newInfo The struct to configure royalties.
     */
    function setRoyaltyInfo(RoyaltyInfo calldata newInfo) external;

    /**
     * @notice Returns the base URI for token metadata.
     */
    function baseURI() external view returns (string memory);

    /**
     * @notice Returns the contract URI.
     */
    function contractURI() external view returns (string memory);

    /**
     * @notice Returns the max token supply.
     */
    function maxSupply() external view returns (uint256);

    /**
     * @notice Returns the provenance hash.
     *         The provenance hash is used for random reveals, which
     *         is a hash of the ordered metadata to show it is unmodified
     *         after mint has started.
     */
    function provenanceHash() external view returns (bytes32);

    /**
     * @notice Returns the address that receives royalties.
     */
    function royaltyAddress() external view returns (address);

    /**
     * @notice Returns the royalty basis points out of 10_000.
     */
    function royaltyBasisPoints() external view returns (uint256);
}

// File: seadrop-main/src/interfaces/INonFungibleSeaDropToken.sol


pragma solidity 0.8.17;



interface INonFungibleSeaDropToken is ISeaDropTokenContractMetadata {
    /**
     * @dev Revert with an error if a contract is not an allowed
     *      SeaDrop address.
     */
    error OnlyAllowedSeaDrop();

    /**
     * @dev Emit an event when allowed SeaDrop contracts are updated.
     */
    event AllowedSeaDropUpdated(address[] allowedSeaDrop);

    /**
     * @notice Update the allowed SeaDrop contracts.
     *         Only the owner or administrator can use this function.
     *
     * @param allowedSeaDrop The allowed SeaDrop addresses.
     */
    function updateAllowedSeaDrop(address[] calldata allowedSeaDrop) external;

    /**
     * @notice Mint tokens, restricted to the SeaDrop contract.
     *
     * @dev    NOTE: If a token registers itself with multiple SeaDrop
     *         contracts, the implementation of this function should guard
     *         against reentrancy. If the implementing token uses
     *         _safeMint(), or a feeRecipient with a malicious receive() hook
     *         is specified, the token or fee recipients may be able to execute
     *         another mint in the same transaction via a separate SeaDrop
     *         contract.
     *         This is dangerous if an implementing token does not correctly
     *         update the minterNumMinted and currentTotalSupply values before
     *         transferring minted tokens, as SeaDrop references these values
     *         to enforce token limits on a per-wallet and per-stage basis.
     *
     * @param minter   The address to mint to.
     * @param quantity The number of tokens to mint.
     */
    function mintSeaDrop(address minter, uint256 quantity) external;

    /**
     * @notice Returns a set of mint stats for the address.
     *         This assists SeaDrop in enforcing maxSupply,
     *         maxTotalMintableByWallet, and maxTokenSupplyForStage checks.
     *
     * @dev    NOTE: Implementing contracts should always update these numbers
     *         before transferring any tokens with _safeMint() to mitigate
     *         consequences of malicious onERC721Received() hooks.
     *
     * @param minter The minter address.
     */
    function getMintStats(address minter)
        external
        view
        returns (
            uint256 minterNumMinted,
            uint256 currentTotalSupply,
            uint256 maxSupply
        );

    /**
     * @notice Update the public drop data for this nft contract on SeaDrop.
     *         Only the owner or administrator can use this function.
     *
     *         The administrator can only update `feeBps`.
     *
     * @param seaDropImpl The allowed SeaDrop contract.
     * @param publicDrop  The public drop data.
     */
    function updatePublicDrop(
        address seaDropImpl,
        PublicDrop calldata publicDrop
    ) external;

    /**
     * @notice Update the allow list data for this nft contract on SeaDrop.
     *         Only the owner or administrator can use this function.
     *
     * @param seaDropImpl   The allowed SeaDrop contract.
     * @param allowListData The allow list data.
     */
    function updateAllowList(
        address seaDropImpl,
        AllowListData calldata allowListData
    ) external;

    /**
     * @notice Update the token gated drop stage data for this nft contract
     *         on SeaDrop.
     *         Only the owner or administrator can use this function.
     *
     *         The administrator, when present, must first set `feeBps`.
     *
     *         Note: If two INonFungibleSeaDropToken tokens are doing
     *         simultaneous token gated drop promotions for each other,
     *         they can be minted by the same actor until
     *         `maxTokenSupplyForStage` is reached. Please ensure the
     *         `allowedNftToken` is not running an active drop during the
     *         `dropStage` time period.
     *
     *
     * @param seaDropImpl     The allowed SeaDrop contract.
     * @param allowedNftToken The allowed nft token.
     * @param dropStage       The token gated drop stage data.
     */
    function updateTokenGatedDrop(
        address seaDropImpl,
        address allowedNftToken,
        TokenGatedDropStage calldata dropStage
    ) external;

    /**
     * @notice Update the drop URI for this nft contract on SeaDrop.
     *         Only the owner or administrator can use this function.
     *
     * @param seaDropImpl The allowed SeaDrop contract.
     * @param dropURI     The new drop URI.
     */
    function updateDropURI(address seaDropImpl, string calldata dropURI)
        external;

    /**
     * @notice Update the creator payout address for this nft contract on
     *         SeaDrop.
     *         Only the owner can set the creator payout address.
     *
     * @param seaDropImpl   The allowed SeaDrop contract.
     * @param payoutAddress The new payout address.
     */
    function updateCreatorPayoutAddress(
        address seaDropImpl,
        address payoutAddress
    ) external;

    /**
     * @notice Update the allowed fee recipient for this nft contract
     *         on SeaDrop.
     *         Only the administrator can set the allowed fee recipient.
     *
     * @param seaDropImpl  The allowed SeaDrop contract.
     * @param feeRecipient The new fee recipient.
     */
    function updateAllowedFeeRecipient(
        address seaDropImpl,
        address feeRecipient,
        bool allowed
    ) external;

    /**
     * @notice Update the server-side signers for this nft contract
     *         on SeaDrop.
     *         Only the owner or administrator can use this function.
     *
     * @param seaDropImpl                The allowed SeaDrop contract.
     * @param signer                     The signer to update.
     * @param signedMintValidationParams Minimum and maximum parameters
     *                                   to enforce for signed mints.
     */
    function updateSignedMintValidationParams(
        address seaDropImpl,
        address signer,
        SignedMintValidationParams memory signedMintValidationParams
    ) external;

    /**
     * @notice Update the allowed payers for this nft contract on SeaDrop.
     *         Only the owner or administrator can use this function.
     *
     * @param seaDropImpl The allowed SeaDrop contract.
     * @param payer       The payer to update.
     * @param allowed     Whether the payer is allowed.
     */
    function updatePayer(
        address seaDropImpl,
        address payer,
        bool allowed
    ) external;
}

// File: seadrop-main/src/ERC721ContractMetadata.sol



pragma solidity 0.8.17;






/**
 * @title  ERC721ContractMetadata
 * @author James Wenzel (emo.eth)
 * @author Ryan Ghods (ralxz.eth)
 * @author Stephan Min (stephanm.eth)
 * @notice ERC721ContractMetadata is a token contract that extends ERC721A
 *         with additional metadata and ownership capabilities.
 */
contract ERC721ContractMetadata is
    ERC721A,
    Ownable2Step,
    ISeaDropTokenContractMetadata
{
    /// @notice Track the max supply.
    uint256 _maxSupply;

    /// @notice Track the base URI for token metadata.
    string _tokenBaseURI;

    /// @notice Track the contract URI for contract metadata.
    string _contractURI;

    /// @notice Track the provenance hash for guaranteeing metadata order
    ///         for random reveals.
    bytes32 _provenanceHash;

    /// @notice Track the royalty info: address to receive royalties, and
    ///         royalty basis points.
    RoyaltyInfo _royaltyInfo;

    error OnlyOwner();

    /**
     * @dev Reverts if the sender is not the owner or the contract itself.
     *      This function is inlined instead of being a modifier
     *      to save contract space from being inlined N times.
     */
    function _onlyOwnerOrSelf() internal view {
        if (
            _cast(msg.sender == owner()) | _cast(msg.sender == address(this)) ==
            0
        ) {
            revert OnlyOwner();
        }
    }

    /**
     * @notice Deploy the token contract with its name and symbol.
     */
    constructor(string memory name, string memory symbol)
        ERC721A(name, symbol)
    {}

    /**
     * @notice Sets the base URI for the token metadata and emits an event.
     *
     * @param newBaseURI The new base URI to set.
     */
    function setBaseURI(string calldata newBaseURI) external override {
        // Ensure the sender is only the owner or contract itself.
        _onlyOwnerOrSelf();

        // Set the new base URI.
        _tokenBaseURI = newBaseURI;

        // Emit an event with the update.
        if (totalSupply() != 0) {
            emit BatchMetadataUpdate(1, _nextTokenId() - 1);
        }
    }

    /**
     * @notice Sets the contract URI for contract metadata.
     *
     * @param newContractURI The new contract URI.
     */
    function setContractURI(string calldata newContractURI) external override {
        // Ensure the sender is only the owner or contract itself.
        _onlyOwnerOrSelf();

        // Set the new contract URI.
        _contractURI = newContractURI;

        // Emit an event with the update.
        emit ContractURIUpdated(newContractURI);
    }

    /**
     * @notice Emit an event notifying metadata updates for
     *         a range of token ids, according to EIP-4906.
     *
     * @param fromTokenId The start token id.
     * @param toTokenId   The end token id.
     */
    function emitBatchMetadataUpdate(uint256 fromTokenId, uint256 toTokenId)
        external
    {
        // Ensure the sender is only the owner or contract itself.
        _onlyOwnerOrSelf();

        // Emit an event with the update.
        emit BatchMetadataUpdate(fromTokenId, toTokenId);
    }

    /**
     * @notice Sets the max token supply and emits an event.
     *
     * @param newMaxSupply The new max supply to set.
     */
    function setMaxSupply(uint256 newMaxSupply) external {
        // Ensure the sender is only the owner or contract itself.
        _onlyOwnerOrSelf();

        // Ensure the max supply does not exceed the maximum value of uint64.
        if (newMaxSupply > 2**64 - 1) {
            revert CannotExceedMaxSupplyOfUint64(newMaxSupply);
        }

        // Set the new max supply.
        _maxSupply = newMaxSupply;

        // Emit an event with the update.
        emit MaxSupplyUpdated(newMaxSupply);
    }

    /**
     * @notice Sets the provenance hash and emits an event.
     *
     *         The provenance hash is used for random reveals, which
     *         is a hash of the ordered metadata to show it has not been
     *         modified after mint started.
     *
     *         This function will revert after the first item has been minted.
     *
     * @param newProvenanceHash The new provenance hash to set.
     */
    function setProvenanceHash(bytes32 newProvenanceHash) external {
        // Ensure the sender is only the owner or contract itself.
        _onlyOwnerOrSelf();

        // Revert if any items have been minted.
        if (_totalMinted() > 0) {
            revert ProvenanceHashCannotBeSetAfterMintStarted();
        }

        // Keep track of the old provenance hash for emitting with the event.
        bytes32 oldProvenanceHash = _provenanceHash;

        // Set the new provenance hash.
        _provenanceHash = newProvenanceHash;

        // Emit an event with the update.
        emit ProvenanceHashUpdated(oldProvenanceHash, newProvenanceHash);
    }

    /**
     * @notice Sets the address and basis points for royalties.
     *
     * @param newInfo The struct to configure royalties.
     */
    function setRoyaltyInfo(RoyaltyInfo calldata newInfo) external {
        // Ensure the sender is only the owner or contract itself.
        _onlyOwnerOrSelf();

        // Revert if the new royalty address is the zero address.
        if (newInfo.royaltyAddress == address(0)) {
            revert RoyaltyAddressCannotBeZeroAddress();
        }

        // Revert if the new basis points is greater than 10_000.
        if (newInfo.royaltyBps > 10_000) {
            revert InvalidRoyaltyBasisPoints(newInfo.royaltyBps);
        }

        // Set the new royalty info.
        _royaltyInfo = newInfo;

        // Emit an event with the updated params.
        emit RoyaltyInfoUpdated(newInfo.royaltyAddress, newInfo.royaltyBps);
    }

    /**
     * @notice Returns the base URI for token metadata.
     */
    function baseURI() external view override returns (string memory) {
        return _baseURI();
    }

    /**
     * @notice Returns the base URI for the contract, which ERC721A uses
     *         to return tokenURI.
     */
    function _baseURI() internal view virtual override returns (string memory) {
        return _tokenBaseURI;
    }

    /**
     * @notice Returns the contract URI for contract metadata.
     */
    function contractURI() external view override returns (string memory) {
        return _contractURI;
    }

    /**
     * @notice Returns the max token supply.
     */
    function maxSupply() public view returns (uint256) {
        return _maxSupply;
    }

    /**
     * @notice Returns the provenance hash.
     *         The provenance hash is used for random reveals, which
     *         is a hash of the ordered metadata to show it is unmodified
     *         after mint has started.
     */
    function provenanceHash() external view override returns (bytes32) {
        return _provenanceHash;
    }

    /**
     * @notice Returns the address that receives royalties.
     */
    function royaltyAddress() external view returns (address) {
        return _royaltyInfo.royaltyAddress;
    }

    /**
     * @notice Returns the royalty basis points out of 10_000.
     */
    function royaltyBasisPoints() external view returns (uint256) {
        return _royaltyInfo.royaltyBps;
    }

    /**
     * @notice Called with the sale price to determine how much royalty
     *         is owed and to whom.
     *
     * @ param  _tokenId     The NFT asset queried for royalty information.
     * @param  _salePrice    The sale price of the NFT asset specified by
     *                       _tokenId.
     *
     * @return receiver      Address of who should be sent the royalty payment.
     * @return royaltyAmount The royalty payment amount for _salePrice.
     */
    function royaltyInfo(
        uint256, /* _tokenId */
        uint256 _salePrice
    ) external view returns (address receiver, uint256 royaltyAmount) {
        // Put the royalty info on the stack for more efficient access.
        RoyaltyInfo storage info = _royaltyInfo;

        // Set the royalty amount to the sale price times the royalty basis
        // points divided by 10_000.
        royaltyAmount = (_salePrice * info.royaltyBps) / 10_000;

        // Set the receiver of the royalty.
        receiver = info.royaltyAddress;
    }

    /**
     * @notice Returns whether the interface is supported.
     *
     * @param interfaceId The interface id to check against.
     */
    function supportsInterface(bytes4 interfaceId)
        public
        view
        virtual
        override(IERC165, ERC721A)
        returns (bool)
    {
        return
            interfaceId == type(IERC2981).interfaceId ||
            interfaceId == 0x49064906 || // ERC-4906
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev Internal pure function to cast a `bool` value to a `uint256` value.
     *
     * @param b The `bool` value to cast.
     *
     * @return u The `uint256` value.
     */
    function _cast(bool b) internal pure returns (uint256 u) {
        assembly {
            u := b
        }
    }
}

// File: seadrop-main/src/ERC721SeaDrop.sol

pragma solidity 0.8.17;

/**
 * @title  ERC721SeaDrop
 * @author James Wenzel (emo.eth)
 * @author Ryan Ghods (ralxz.eth)
 * @author Stephan Min (stephanm.eth)
 * @author Michael Cohen (notmichael.eth)
 * @notice ERC721SeaDrop is a token contract that contains methods
 *         to properly interact with SeaDrop.
 */
contract HappyKittenBoys is
    ERC721ContractMetadata,
    INonFungibleSeaDropToken,
    ERC721SeaDropStructsErrorsAndEvents,
    ReentrancyGuard,
    DefaultOperatorFilterer
{
    /// @notice Track the allowed SeaDrop addresses.
    mapping(address => bool) internal _allowedSeaDrop;

    /// @notice Track the enumerated allowed SeaDrop addresses.
    address[] internal _enumeratedAllowedSeaDrop;

    bool public isPaused = true;

    /**
     * @dev Reverts if not an allowed SeaDrop contract.
     *      This function is inlined instead of being a modifier
     *      to save contract space from being inlined N times.
     *
     * @param seaDrop The SeaDrop address to check if allowed.
     */
    function _onlyAllowedSeaDrop(address seaDrop) internal view {
        if (_allowedSeaDrop[seaDrop] != true) {
            revert OnlyAllowedSeaDrop();
        }
    }

    /**
     * @notice Deploy the token contract with its name, symbol,
     *         and allowed SeaDrop addresses.
     */
    constructor(
        string memory name,
        string memory symbol,
        address[] memory allowedSeaDrop
    ) ERC721ContractMetadata(name, symbol) {
        // Put the length on the stack for more efficient access.
        uint256 allowedSeaDropLength = allowedSeaDrop.length;

        // Set the mapping for allowed SeaDrop contracts.
        for (uint256 i = 0; i < allowedSeaDropLength; ) {
            _allowedSeaDrop[allowedSeaDrop[i]] = true;
            unchecked {
                ++i;
            }
        }

        // Set the enumeration.
        _enumeratedAllowedSeaDrop = allowedSeaDrop;

        // Emit an event noting the contract deployment.
        emit SeaDropTokenDeployed();
    }

    /**
     * @notice Update the allowed SeaDrop contracts.
     *         Only the owner or administrator can use this function.
     *
     * @param allowedSeaDrop The allowed SeaDrop addresses.
     */
    function updateAllowedSeaDrop(address[] calldata allowedSeaDrop)
        external
        virtual
        override
        onlyOwner
    {
        _updateAllowedSeaDrop(allowedSeaDrop);
    }

    /**
     * @notice Internal function to update the allowed SeaDrop contracts.
     *
     * @param allowedSeaDrop The allowed SeaDrop addresses.
     */
    function _updateAllowedSeaDrop(address[] calldata allowedSeaDrop) internal {
        // Put the length on the stack for more efficient access.
        uint256 enumeratedAllowedSeaDropLength = _enumeratedAllowedSeaDrop
            .length;
        uint256 allowedSeaDropLength = allowedSeaDrop.length;

        // Reset the old mapping.
        for (uint256 i = 0; i < enumeratedAllowedSeaDropLength; ) {
            _allowedSeaDrop[_enumeratedAllowedSeaDrop[i]] = false;
            unchecked {
                ++i;
            }
        }

        // Set the new mapping for allowed SeaDrop contracts.
        for (uint256 i = 0; i < allowedSeaDropLength; ) {
            _allowedSeaDrop[allowedSeaDrop[i]] = true;
            unchecked {
                ++i;
            }
        }

        // Set the enumeration.
        _enumeratedAllowedSeaDrop = allowedSeaDrop;

        // Emit an event for the update.
        emit AllowedSeaDropUpdated(allowedSeaDrop);
    }

    /**
     * @dev Overrides the `_startTokenId` function from ERC721A
     *      to start at token id `1`.
     *
     *      This is to avoid future possible problems since `0` is usually
     *      used to signal values that have not been set or have been removed.
     */
    function _startTokenId() internal view virtual override returns (uint256) {
        return 1;
    }

    /**
     * @dev Overrides the `tokenURI()` function from ERC721A
     *      to return just the base URI if it is implied to not be a directory.
     *
     *      This is to help with ERC721 contracts in which the same token URI
     *      is desired for each token, such as when the tokenURI is 'unrevealed'.
     */
    function tokenURI(uint256 tokenId)
        public
        view
        virtual
        override
        returns (string memory)
    {
        if (!_exists(tokenId)) revert URIQueryForNonexistentToken();

        string memory baseURI = _baseURI();

        // Exit early if the baseURI is empty.
        if (bytes(baseURI).length == 0) {
            return "";
        }

        // Check if the last character in baseURI is a slash.
        if (bytes(baseURI)[bytes(baseURI).length - 1] != bytes("/")[0]) {
            return baseURI;
        }

        return string(abi.encodePacked(baseURI, _toString(tokenId), ".json"));
    }

    function toggleIsPaused() external onlyOwner {
        isPaused = !isPaused;
    }

    /**
     * @notice Mint tokens, restricted to the SeaDrop contract.
     *
     * @dev    NOTE: If a token registers itself with multiple SeaDrop
     *         contracts, the implementation of this function should guard
     *         against reentrancy. If the implementing token uses
     *         _safeMint(), or a feeRecipient with a malicious receive() hook
     *         is specified, the token or fee recipients may be able to execute
     *         another mint in the same transaction via a separate SeaDrop
     *         contract.
     *         This is dangerous if an implementing token does not correctly
     *         update the minterNumMinted and currentTotalSupply values before
     *         transferring minted tokens, as SeaDrop references these values
     *         to enforce token limits on a per-wallet and per-stage basis.
     *
     *         ERC721A tracks these values automatically, but this note and
     *         nonReentrant modifier are left here to encourage best-practices
     *         when referencing this contract.
     *
     * @param minter   The address to mint to.
     * @param quantity The number of tokens to mint.
     */
    function mintSeaDrop(address minter, uint256 quantity)
        external
        virtual
        override
        nonReentrant
    {
        // Ensure the SeaDrop is allowed.
        _onlyAllowedSeaDrop(msg.sender);

        require(isPaused == false, "Public and whitelist minting is paused");

        // Extra safety check to ensure the max supply is not exceeded.
        if (_totalMinted() + quantity > maxSupply()) {
            revert MintQuantityExceedsMaxSupply(
                _totalMinted() + quantity,
                maxSupply()
            );
        }

        // Mint the quantity of tokens to the minter.
        _safeMint(minter, quantity);
    }

    function mintByOwner(address recipient, uint256 quantity) external onlyOwner {
        require(_totalMinted() + quantity <= maxSupply(), "Exceeds maxSupply");
        _safeMint(recipient, quantity);
    }

    /**
     * @notice Update the public drop data for this nft contract on SeaDrop.
     *         Only the owner can use this function.
     *
     * @param seaDropImpl The allowed SeaDrop contract.
     * @param publicDrop  The public drop data.
     */
    function updatePublicDrop(
        address seaDropImpl,
        PublicDrop calldata publicDrop
    ) external virtual override {
        // Ensure the sender is only the owner or contract itself.
        _onlyOwnerOrSelf();

        // Ensure the SeaDrop is allowed.
        _onlyAllowedSeaDrop(seaDropImpl);

        // Update the public drop data on SeaDrop.
        ISeaDrop(seaDropImpl).updatePublicDrop(publicDrop);
    }

    /**
     * @notice Update the allow list data for this nft contract on SeaDrop.
     *         Only the owner can use this function.
     *
     * @param seaDropImpl   The allowed SeaDrop contract.
     * @param allowListData The allow list data.
     */
    function updateAllowList(
        address seaDropImpl,
        AllowListData calldata allowListData
    ) external virtual override {
        // Ensure the sender is only the owner or contract itself.
        _onlyOwnerOrSelf();

        // Ensure the SeaDrop is allowed.
        _onlyAllowedSeaDrop(seaDropImpl);

        // Update the allow list on SeaDrop.
        ISeaDrop(seaDropImpl).updateAllowList(allowListData);
    }

    /**
     * @notice Update the token gated drop stage data for this nft contract
     *         on SeaDrop.
     *         Only the owner can use this function.
     *
     *         Note: If two INonFungibleSeaDropToken tokens are doing
     *         simultaneous token gated drop promotions for each other,
     *         they can be minted by the same actor until
     *         `maxTokenSupplyForStage` is reached. Please ensure the
     *         `allowedNftToken` is not running an active drop during the
     *         `dropStage` time period.
     *
     * @param seaDropImpl     The allowed SeaDrop contract.
     * @param allowedNftToken The allowed nft token.
     * @param dropStage       The token gated drop stage data.
     */
    function updateTokenGatedDrop(
        address seaDropImpl,
        address allowedNftToken,
        TokenGatedDropStage calldata dropStage
    ) external virtual override {
        // Ensure the sender is only the owner or contract itself.
        _onlyOwnerOrSelf();

        // Ensure the SeaDrop is allowed.
        _onlyAllowedSeaDrop(seaDropImpl);

        // Update the token gated drop stage.
        ISeaDrop(seaDropImpl).updateTokenGatedDrop(allowedNftToken, dropStage);
    }

    /**
     * @notice Update the drop URI for this nft contract on SeaDrop.
     *         Only the owner can use this function.
     *
     * @param seaDropImpl The allowed SeaDrop contract.
     * @param dropURI     The new drop URI.
     */
    function updateDropURI(address seaDropImpl, string calldata dropURI)
        external
        virtual
        override
    {
        // Ensure the sender is only the owner or contract itself.
        _onlyOwnerOrSelf();

        // Ensure the SeaDrop is allowed.
        _onlyAllowedSeaDrop(seaDropImpl);

        // Update the drop URI.
        ISeaDrop(seaDropImpl).updateDropURI(dropURI);
    }

    /**
     * @notice Update the creator payout address for this nft contract on
     *         SeaDrop.
     *         Only the owner can set the creator payout address.
     *
     * @param seaDropImpl   The allowed SeaDrop contract.
     * @param payoutAddress The new payout address.
     */
    function updateCreatorPayoutAddress(
        address seaDropImpl,
        address payoutAddress
    ) external {
        // Ensure the sender is only the owner or contract itself.
        _onlyOwnerOrSelf();

        // Ensure the SeaDrop is allowed.
        _onlyAllowedSeaDrop(seaDropImpl);

        // Update the creator payout address.
        ISeaDrop(seaDropImpl).updateCreatorPayoutAddress(payoutAddress);
    }

    /**
     * @notice Update the allowed fee recipient for this nft contract
     *         on SeaDrop.
     *         Only the owner can set the allowed fee recipient.
     *
     * @param seaDropImpl  The allowed SeaDrop contract.
     * @param feeRecipient The new fee recipient.
     * @param allowed      If the fee recipient is allowed.
     */
    function updateAllowedFeeRecipient(
        address seaDropImpl,
        address feeRecipient,
        bool allowed
    ) external virtual {
        // Ensure the sender is only the owner or contract itself.
        _onlyOwnerOrSelf();

        // Ensure the SeaDrop is allowed.
        _onlyAllowedSeaDrop(seaDropImpl);

        // Update the allowed fee recipient.
        ISeaDrop(seaDropImpl).updateAllowedFeeRecipient(feeRecipient, allowed);
    }

    /**
     * @notice Update the server-side signers for this nft contract
     *         on SeaDrop.
     *         Only the owner can use this function.
     *
     * @param seaDropImpl                The allowed SeaDrop contract.
     * @param signer                     The signer to update.
     * @param signedMintValidationParams Minimum and maximum parameters to
     *                                   enforce for signed mints.
     */
    function updateSignedMintValidationParams(
        address seaDropImpl,
        address signer,
        SignedMintValidationParams memory signedMintValidationParams
    ) external virtual override {
        // Ensure the sender is only the owner or contract itself.
        _onlyOwnerOrSelf();

        // Ensure the SeaDrop is allowed.
        _onlyAllowedSeaDrop(seaDropImpl);

        // Update the signer.
        ISeaDrop(seaDropImpl).updateSignedMintValidationParams(
            signer,
            signedMintValidationParams
        );
    }

    /**
     * @notice Update the allowed payers for this nft contract on SeaDrop.
     *         Only the owner can use this function.
     *
     * @param seaDropImpl The allowed SeaDrop contract.
     * @param payer       The payer to update.
     * @param allowed     Whether the payer is allowed.
     */
    function updatePayer(
        address seaDropImpl,
        address payer,
        bool allowed
    ) external virtual override {
        // Ensure the sender is only the owner or contract itself.
        _onlyOwnerOrSelf();

        // Ensure the SeaDrop is allowed.
        _onlyAllowedSeaDrop(seaDropImpl);

        // Update the payer.
        ISeaDrop(seaDropImpl).updatePayer(payer, allowed);
    }

    /**
     * @notice Returns a set of mint stats for the address.
     *         This assists SeaDrop in enforcing maxSupply,
     *         maxTotalMintableByWallet, and maxTokenSupplyForStage checks.
     *
     * @dev    NOTE: Implementing contracts should always update these numbers
     *         before transferring any tokens with _safeMint() to mitigate
     *         consequences of malicious onERC721Received() hooks.
     *
     * @param minter The minter address.
     */
    function getMintStats(address minter)
        external
        view
        override
        returns (
            uint256 minterNumMinted,
            uint256 currentTotalSupply,
            uint256 maxSupply
        )
    {
        minterNumMinted = _numberMinted(minter);
        currentTotalSupply = _totalMinted();
        maxSupply = _maxSupply;
    }

    /**
     * @notice Returns whether the interface is supported.
     *
     * @param interfaceId The interface id to check against.
     */
    function supportsInterface(bytes4 interfaceId)
        public
        view
        virtual
        override(IERC165, ERC721ContractMetadata)
        returns (bool)
    {
        return
            interfaceId == type(INonFungibleSeaDropToken).interfaceId ||
            interfaceId == type(ISeaDropTokenContractMetadata).interfaceId ||
            // ERC721ContractMetadata returns supportsInterface true for
            //     EIP-2981
            // ERC721A returns supportsInterface true for
            //     ERC165, ERC721, ERC721Metadata
            super.supportsInterface(interfaceId);
    }

    /**
     * @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.
     * - The `operator` must be allowed.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool approved)
        public
        override
        onlyAllowedOperatorApproval(operator)
    {
        super.setApprovalForAll(operator, approved);
    }

    /**
     * @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.
     * - The `operator` mut be allowed.
     *
     * Emits an {Approval} event.
     */
    function approve(address operator, uint256 tokenId)
        public payable 
        override
        onlyAllowedOperatorApproval(operator)
    {
        super.approve(operator, tokenId);
    }

    /**
     * @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}.
     * - The operator must be allowed.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public payable  override onlyAllowedOperator(from) {
        super.transferFrom(from, to, tokenId);
    }

    /**
     * @dev Equivalent to `safeTransferFrom(from, to, tokenId, '')`.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public payable  override onlyAllowedOperator(from) {
        super.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.
     * - The operator must be allowed.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) public payable override onlyAllowedOperator(from) {
        super.safeTransferFrom(from, to, tokenId, data);
    }

    /**
     * @notice Configure multiple properties at a time.
     *
     *         Note: The individual configure methods should be used
     *         to unset or reset any properties to zero, as this method
     *         will ignore zero-value properties in the config struct.
     *
     * @param config The configuration struct.
     */
    function multiConfigure(MultiConfigureStruct calldata config)
        external
        onlyOwner
    {
        if (config.maxSupply > 0) {
            this.setMaxSupply(config.maxSupply);
        }
        if (bytes(config.baseURI).length != 0) {
            this.setBaseURI(config.baseURI);
        }
        if (bytes(config.contractURI).length != 0) {
            this.setContractURI(config.contractURI);
        }
        if (
            _cast(config.publicDrop.startTime != 0) |
                _cast(config.publicDrop.endTime != 0) ==
            1
        ) {
            this.updatePublicDrop(config.seaDropImpl, config.publicDrop);
        }
        if (bytes(config.dropURI).length != 0) {
            this.updateDropURI(config.seaDropImpl, config.dropURI);
        }
        if (config.allowListData.merkleRoot != bytes32(0)) {
            this.updateAllowList(config.seaDropImpl, config.allowListData);
        }
        if (config.creatorPayoutAddress != address(0)) {
            this.updateCreatorPayoutAddress(
                config.seaDropImpl,
                config.creatorPayoutAddress
            );
        }
        if (config.provenanceHash != bytes32(0)) {
            this.setProvenanceHash(config.provenanceHash);
        }
        if (config.allowedFeeRecipients.length > 0) {
            for (uint256 i = 0; i < config.allowedFeeRecipients.length; ) {
                this.updateAllowedFeeRecipient(
                    config.seaDropImpl,
                    config.allowedFeeRecipients[i],
                    true
                );
                unchecked {
                    ++i;
                }
            }
        }
        if (config.disallowedFeeRecipients.length > 0) {
            for (uint256 i = 0; i < config.disallowedFeeRecipients.length; ) {
                this.updateAllowedFeeRecipient(
                    config.seaDropImpl,
                    config.disallowedFeeRecipients[i],
                    false
                );
                unchecked {
                    ++i;
                }
            }
        }
        if (config.allowedPayers.length > 0) {
            for (uint256 i = 0; i < config.allowedPayers.length; ) {
                this.updatePayer(
                    config.seaDropImpl,
                    config.allowedPayers[i],
                    true
                );
                unchecked {
                    ++i;
                }
            }
        }
        if (config.disallowedPayers.length > 0) {
            for (uint256 i = 0; i < config.disallowedPayers.length; ) {
                this.updatePayer(
                    config.seaDropImpl,
                    config.disallowedPayers[i],
                    false
                );
                unchecked {
                    ++i;
                }
            }
        }
        if (config.tokenGatedDropStages.length > 0) {
            if (
                config.tokenGatedDropStages.length !=
                config.tokenGatedAllowedNftTokens.length
            ) {
                revert TokenGatedMismatch();
            }
            for (uint256 i = 0; i < config.tokenGatedDropStages.length; ) {
                this.updateTokenGatedDrop(
                    config.seaDropImpl,
                    config.tokenGatedAllowedNftTokens[i],
                    config.tokenGatedDropStages[i]
                );
                unchecked {
                    ++i;
                }
            }
        }
        if (config.disallowedTokenGatedAllowedNftTokens.length > 0) {
            for (
                uint256 i = 0;
                i < config.disallowedTokenGatedAllowedNftTokens.length;

            ) {
                TokenGatedDropStage memory emptyStage;
                this.updateTokenGatedDrop(
                    config.seaDropImpl,
                    config.disallowedTokenGatedAllowedNftTokens[i],
                    emptyStage
                );
                unchecked {
                    ++i;
                }
            }
        }
        if (config.signedMintValidationParams.length > 0) {
            if (
                config.signedMintValidationParams.length !=
                config.signers.length
            ) {
                revert SignersMismatch();
            }
            for (
                uint256 i = 0;
                i < config.signedMintValidationParams.length;

            ) {
                this.updateSignedMintValidationParams(
                    config.seaDropImpl,
                    config.signers[i],
                    config.signedMintValidationParams[i]
                );
                unchecked {
                    ++i;
                }
            }
        }
        if (config.disallowedSigners.length > 0) {
            for (uint256 i = 0; i < config.disallowedSigners.length; ) {
                SignedMintValidationParams memory emptyParams;
                this.updateSignedMintValidationParams(
                    config.seaDropImpl,
                    config.disallowedSigners[i],
                    emptyParams
                );
                unchecked {
                    ++i;
                }
            }
        }
    }
}