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// SPDX-License-Identifier: MIT
pragma solidity 0.8.4;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import {SafeTransferLib} from "@rari-capital/solmate/src/utils/SafeTransferLib.sol";
import "./ChaosPacks.sol";
import "./external/interfaces/ISplitMain.sol";
import "./external/erc721a/extensions/ERC721ABurnable.sol";
import "./BatchShuffle.sol";
import "./Royalties/ERC2981/IERC2981Royalties.sol";

error CallerIsNotTokenOwner();
error PacksDisabledUntilSuperchargedComplete();
error SuperchargedOffsetAlreadySet();
error SuperchargeConfigurationNotReady();
error SuperchargedOffsetNotSet();
error InvalidOffset();
error BurnPackFailed();
error PackContractLocked();

/// @title Chaos Songs
/// @notice Distribute random selection of 4 songs to Chaos Pack holders
contract ChaosSongs is
    ERC721ABurnable,
    Ownable,
    BatchShuffle,
    IERC2981Royalties
{
    using SafeTransferLib for address payable;
    using SafeTransferLib for ERC20;
    using Strings for uint256;

    uint256 constant SONG_COUNT = 4; /* Number of songs minted on pack open*/
    uint32 constant SUPERCHARGED_SUPPLY = 1e3; /* Number of supercharged songs*/
    uint16 constant PACK_SUPPLY = 5e3; /*Supply of packs determines number of offsets*/

    uint256 public royaltyPoints; /*Royalty percentage / 10000*/

    uint256 public superchargedOffset; /*Track offset for first 1000 NFTs separately*/

    ChaosPacks public packContract; /*External contract to use for pack NFTs*/
    bool public packContractLocked; /*Allow pack contract to be locked against further change*/

    /*Liquid splits config*/
    address payable public immutable payoutSplit; /* 0xSplits address for split */
    ISplitMain public splitMain; /* 0xSplits address for updating & distributing split */
    uint32 public distributorFee; /* 0xSplits distributorFee payable to third parties covering gas of distribution */
    mapping(address => uint32) public superchargeBalances; /*Track supercharged balance separately for liquid splits*/

    /*Contract config*/
    string public contractURI; /*contractURI contract metadata json*/
    string public baseURI; /*baseURI_ String to prepend to token IDs*/

    event PackOpened(uint256 _id, address _opener);

    /// @notice Constructor sets contract metadata configurations and split interfaces
    /// @param baseURI_ Base URI for token metadata
    /// @param _contractURI URI for marketplace contract metadata
    /// @param _splitMain Address of splits contract for sending royalties
    /// @param _distributorFee Optional fee to compensate address calling distribute, offset gas
    /// @param _royaltyPoints BP of royalties to send to song contract
    constructor(
        string memory baseURI_,
        string memory _contractURI,
        address _splitMain,
        uint256 _royaltyPoints,
        uint32 _distributorFee
    )
        ERC721A("Chaos", "\u0024SONGS")
        BatchShuffle(PACK_SUPPLY, SONG_COUNT, SUPERCHARGED_SUPPLY)
    {
        baseURI = baseURI_; /*Set token level metadata*/
        contractURI = _contractURI; /*Set marketplace metadata*/

        splitMain = ISplitMain(_splitMain); /*Establish interface to splits contract*/

        // create dummy mutable split with this contract as controller;
        // recipients & distributorFee will be updated on first payout
        address[] memory recipients = new address[](2);
        recipients[0] = address(0);
        recipients[1] = address(1);
        uint32[] memory percentAllocations = new uint32[](2);
        percentAllocations[0] = uint32(500000);
        percentAllocations[1] = uint32(500000);
        payoutSplit = payable(
            splitMain.createSplit(
                recipients,
                percentAllocations,
                0,
                address(this)
            )
        );
        distributorFee = _distributorFee; /*Set optional fee for calling distribute*/

        royaltyPoints = _royaltyPoints; /*Set royalty amount out of 10000*/
    }

    /*****************
    EXTERNAL MINTING FUNCTIONS
    *****************/
    /// @dev Burn packs and receive 4 song NFTs in exchange
    /// @param _packIds Packs owned by sender
    function batchOpenPack(uint256[] calldata _packIds) external {
        for (uint256 index = 0; index < _packIds.length; index++) {
            _openPack(_packIds[index]);
        }
    }

    /// @dev Burn a pack and receive 4 song NFTs in exchange
    /// @param _packId Pack owned by sender
    function openPack(uint256 _packId) external {
        _openPack(_packId);
    }

    /// @dev Burn a pack and receive 4 song NFTs in exchange
    /// @param _packId Pack owned by sender
    function _openPack(uint256 _packId) internal {
        if (packContract.ownerOf(_packId) != msg.sender)
            /*Only pack owner can open pack*/
            revert CallerIsNotTokenOwner();

        if (superchargedOffset == 0)
            /*Pack opening disabled until supercharged tokens are configured*/
            revert PacksDisabledUntilSuperchargedComplete();

        if (!packContract.burnPack(_packId)) revert BurnPackFailed(); /*Opening a pack burns the pack NT*/
        _mintSongs(msg.sender, _currentIndex); /*Mint 4 songs to opener*/

        emit PackOpened(_packId, msg.sender);
    }

    /*****************
    Permissioned Minting
    *****************/

    /// @dev Mint the supercharged tokens to proper destination
    /// @param _to Recipient
    /// @param _amount Number of tokens to send
    function mintSupercharged(address _to, uint256 _amount) external onlyOwner {
        _mintSupercharged(_to, _amount);
    }

    /// @dev Mint the supercharged tokens to proper destination in batches
    /// @param _tos Recipients
    /// @param _amounts Numbers of tokens to send
    function batchMintSupercharged(
        address[] calldata _tos,
        uint256[] calldata _amounts
    ) external onlyOwner {
        if (_tos.length != _amounts.length) revert LengthMismatch();
        for (uint256 index = 0; index < _tos.length; index++) {
            _mintSupercharged(_tos[index], _amounts[index]);
        }
    }

    /*****************
    RNG Config
    *****************/
    /// @notice Set the offset using on chain entropy for the reserve minted tokens
    /// @dev Should be done AFTER distribution, BEFORE pack opening
    ///     In rare case that offset is 0, fail transaction and allow owner to rerun
    function setSuperchargedOffset() external onlyOwner {
        if (superchargedOffset != 0) revert SuperchargedOffsetAlreadySet(); /*Can only be set once*/
        if (totalSupply() != SUPERCHARGED_SUPPLY)
            /*Must be done after supercharge minting is complete before pack opening*/
            revert SuperchargeConfigurationNotReady();

        uint256 _seed = uint256(blockhash(block.number - 1)); /*Use prev block hash for pseudo randomness*/

        superchargedOffset = _seed % SUPERCHARGED_SUPPLY; /*Mod seed by supply to get offset*/
        if (superchargedOffset == 0) revert InvalidOffset(); /*Fail the transaction if we get 0*/
    }

    /*****************
    Internal RNG functions
    *****************/
    /// @dev Get the token ID to use for URI of a token ID
    /// @param _tokenId Token to check
    function getSongTokenId(uint256 _tokenId) public view returns (uint256) {
        if (!_exists(_tokenId)) revert URIQueryForNonexistentToken(); /*Only return for minted tokens*/
        uint256 _shuffledTokenId; /*Initialize shuffled token ID*/

        /*If not supercharged use individual offsets*/
        if (_tokenId >= SUPERCHARGED_SUPPLY) {
            _shuffledTokenId = getShuffledTokenId(_tokenId);
        } else {
            /*If supercharged use the supercharged offset*/
            if (superchargedOffset == 0) revert SuperchargedOffsetNotSet(); /*Require that offset is set for this to return*/
            _shuffledTokenId =
                (superchargedOffset + _tokenId) %
                SUPERCHARGED_SUPPLY; /*Supercharged offset is same for all tokens*/
        }

        return _shuffledTokenId;
    }

    /*****************
    INTERNAL MINTING FUNCTIONS AND HELPERS
    *****************/
    function _mintSongs(address _to, uint256 _offsetIndex) internal {
        _safeMint(_to, SONG_COUNT);

        uint256 _seed = uint256(blockhash(block.number - 1)); /*Use prev block hash for pseudo randomness*/
        _setNextOffset(_offsetIndex, _seed);
    }

    /// @dev Mint the supercharged tokens to proper destination - internal utility
    /// @param _to Recipient
    /// @param _amount Number of tokens to send
    function _mintSupercharged(address _to, uint256 _amount) internal {
        if ((totalSupply() + _amount > SUPERCHARGED_SUPPLY))
            revert MaxSupplyExceeded(); /*Revert if max supply exceeded*/
        _safeMint(_to, _amount); /*Batch mint*/
    }

    /*****************
    DISTRIBUTION FUNCTIONS
    *****************/

    /// @notice distributes ETH to supercharged NFT holders
    /// @param accounts Ordered, unique list of supercharged NFT tokenholders
    /// @param distributorAddress Address to receive distributorFee
    function distributeETH(
        address[] calldata accounts,
        address distributorAddress
    ) external {
        uint256 numRecipients = accounts.length;
        uint32[] memory percentAllocations = new uint32[](numRecipients);
        for (uint256 i = 0; i < numRecipients; ) {
            percentAllocations[i] =
                (superchargeBalances[accounts[i]] * 1e6) /
                SUPERCHARGED_SUPPLY;
            unchecked {
                ++i;
            }
        }

        // atomically deposit funds into split, update recipients to reflect current supercharged NFT holders,
        // and distribute
        payoutSplit.safeTransferETH(address(this).balance);
        splitMain.updateAndDistributeETH(
            payoutSplit,
            accounts,
            percentAllocations,
            distributorFee,
            distributorAddress
        );
    }

    /// @notice distributes ERC20s to supercharged NFT holders
    /// @param accounts Ordered, unique list of supercharged NFT tokenholders
    /// @param token ERC20 token to distribute
    /// @param distributorAddress Address to receive distributorFee
    function distributeERC20(
        address[] calldata accounts,
        ERC20 token,
        address distributorAddress
    ) external {
        uint256 numRecipients = accounts.length;
        uint32[] memory percentAllocations = new uint32[](numRecipients);
        for (uint256 i = 0; i < numRecipients; ) {
            percentAllocations[i] =
                (superchargeBalances[accounts[i]] * 1e6) /
                SUPERCHARGED_SUPPLY;
            unchecked {
                ++i;
            }
        }

        // atomically deposit funds into split, update recipients to reflect current supercharged NFT holders,
        // and distribute
        token.safeTransfer(payoutSplit, token.balanceOf(address(this)));
        splitMain.updateAndDistributeERC20(
            payoutSplit,
            token,
            accounts,
            percentAllocations,
            distributorFee,
            distributorAddress
        );
    }

    /*****************
    CONFIG FUNCTIONS
    *****************/

    /// @notice Set the contract with packs to burn upon opening
    /// @dev reverts if locked
    /// @param _packContract New contract address
    function setPackContract(address _packContract) external onlyOwner {
        if (packContractLocked) revert PackContractLocked();
        packContract = ChaosPacks(_packContract);
    }

    /// @notice Lock pack contract against further changes
    function lockPackAddress() external onlyOwner {
        if (packContractLocked) revert PackContractLocked();
        packContractLocked = true;
    }

    /// @notice Set new base URI
    /// @dev only possible before supercharged offset is set
    /// @param baseURI_ String to prepend to token IDs
    function setBaseURI(string memory baseURI_) external onlyOwner {
        baseURI = baseURI_;
    }

    /// @notice Set new contract URI
    /// @param _contractURI Contract metadata json
    function setContractURI(string memory _contractURI) external onlyOwner {
        contractURI = _contractURI;
    }

    /// @notice Set distributorFee as owner
    /// @param _distributorFee 0xSplits distributorFee payable to third parties covering gas of distribution
    function setDistributorFee(uint32 _distributorFee) external onlyOwner {
        distributorFee = _distributorFee;
    }

    /// @notice Set royalty points
    /// @param _royaltyPoints Royalty percentage / 10000
    function setRoyaltyPoints(uint256 _royaltyPoints) external onlyOwner {
        royaltyPoints = _royaltyPoints;
    }

    /*****************
    Public view interfaces
    *****************/
    function tokenURI(uint256 tokenId)
        public
        view
        override
        returns (string memory)
    {
        if (!_exists(tokenId)) revert URIQueryForNonexistentToken();
        uint256 _shuffled = getSongTokenId(tokenId);

        return
            bytes(baseURI).length > 0
                ? string(
                    abi.encodePacked(baseURI, _shuffled.toString(), ".json")
                )
                : "";
    }

    /// @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 _value - 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 value sale price
    function royaltyInfo(uint256 _tokenId, uint256 _value)
        external
        view
        override(IERC2981Royalties)
        returns (address _receiver, uint256 _royaltyAmount)
    {
        return (address(this), (_value * royaltyPoints) / 10000);
    }

    /*****************
    Hooks
    *****************/
    function _beforeTokenTransfers(
        address from,
        address to,
        uint256 startTokenId,
        uint256 quantity
    ) internal override(ERC721A) {
        super._beforeTokenTransfers(from, to, startTokenId, quantity);
        if (startTokenId < SUPERCHARGED_SUPPLY) {
            require(to != address(0)); /*Disallow burning of supercharged tokens*/
            if (from != address(0)) {
                superchargeBalances[from] -= uint32(quantity);
            }
            superchargeBalances[to] += uint32(quantity);
        }
    }

    receive() external payable {}
}

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

pragma solidity ^0.8.0;

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

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

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

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

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

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

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

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

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

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

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

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

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

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

import {ERC20} from "../tokens/ERC20.sol";

/// @notice Safe ETH and ERC20 transfer library that gracefully handles missing return values.
/// @author Solmate (https://github.com/Rari-Capital/solmate/blob/main/src/utils/SafeTransferLib.sol)
/// @author Modified from Gnosis (https://github.com/gnosis/gp-v2-contracts/blob/main/src/contracts/libraries/GPv2SafeERC20.sol)
/// @dev Use with caution! Some functions in this library knowingly create dirty bits at the destination of the free memory pointer.
library SafeTransferLib {
    /*///////////////////////////////////////////////////////////////
                            ETH OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function safeTransferETH(address to, uint256 amount) internal {
        bool callStatus;

        assembly {
            // Transfer the ETH and store if it succeeded or not.
            callStatus := call(gas(), to, amount, 0, 0, 0, 0)
        }

        require(callStatus, "ETH_TRANSFER_FAILED");
    }

    /*///////////////////////////////////////////////////////////////
                           ERC20 OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function safeTransferFrom(
        ERC20 token,
        address from,
        address to,
        uint256 amount
    ) internal {
        bool callStatus;

        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata to memory piece by piece:
            mstore(freeMemoryPointer, 0x23b872dd00000000000000000000000000000000000000000000000000000000) // Begin with the function selector.
            mstore(add(freeMemoryPointer, 4), and(from, 0xffffffffffffffffffffffffffffffffffffffff)) // Mask and append the "from" argument.
            mstore(add(freeMemoryPointer, 36), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Mask and append the "to" argument.
            mstore(add(freeMemoryPointer, 68), amount) // Finally append the "amount" argument. No mask as it's a full 32 byte value.

            // Call the token and store if it succeeded or not.
            // We use 100 because the calldata length is 4 + 32 * 3.
            callStatus := call(gas(), token, 0, freeMemoryPointer, 100, 0, 0)
        }

        require(didLastOptionalReturnCallSucceed(callStatus), "TRANSFER_FROM_FAILED");
    }

    function safeTransfer(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool callStatus;

        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata to memory piece by piece:
            mstore(freeMemoryPointer, 0xa9059cbb00000000000000000000000000000000000000000000000000000000) // Begin with the function selector.
            mstore(add(freeMemoryPointer, 4), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Mask and append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Finally append the "amount" argument. No mask as it's a full 32 byte value.

            // Call the token and store if it succeeded or not.
            // We use 68 because the calldata length is 4 + 32 * 2.
            callStatus := call(gas(), token, 0, freeMemoryPointer, 68, 0, 0)
        }

        require(didLastOptionalReturnCallSucceed(callStatus), "TRANSFER_FAILED");
    }

    function safeApprove(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool callStatus;

        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata to memory piece by piece:
            mstore(freeMemoryPointer, 0x095ea7b300000000000000000000000000000000000000000000000000000000) // Begin with the function selector.
            mstore(add(freeMemoryPointer, 4), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Mask and append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Finally append the "amount" argument. No mask as it's a full 32 byte value.

            // Call the token and store if it succeeded or not.
            // We use 68 because the calldata length is 4 + 32 * 2.
            callStatus := call(gas(), token, 0, freeMemoryPointer, 68, 0, 0)
        }

        require(didLastOptionalReturnCallSucceed(callStatus), "APPROVE_FAILED");
    }

    /*///////////////////////////////////////////////////////////////
                         INTERNAL HELPER LOGIC
    //////////////////////////////////////////////////////////////*/

    function didLastOptionalReturnCallSucceed(bool callStatus) private pure returns (bool success) {
        assembly {
            // Get how many bytes the call returned.
            let returnDataSize := returndatasize()

            // If the call reverted:
            if iszero(callStatus) {
                // Copy the revert message into memory.
                returndatacopy(0, 0, returnDataSize)

                // Revert with the same message.
                revert(0, returnDataSize)
            }

            switch returnDataSize
            case 32 {
                // Copy the return data into memory.
                returndatacopy(0, 0, returnDataSize)

                // Set success to whether it returned true.
                success := iszero(iszero(mload(0)))
            }
            case 0 {
                // There was no return data.
                success := 1
            }
            default {
                // It returned some malformed input.
                success := 0
            }
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.4;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import {SafeTransferLib} from "@rari-capital/solmate/src/utils/SafeTransferLib.sol";
import "./external/erc721a/ERC721A.sol";
import "./Royalties/ERC2981/IERC2981Royalties.sol";

error OnlyOneCallPerBlockForNonEOA();
error SaleDisabled();
error MaxSupplyExceeded();
error MaxReserveExceeded();
error MaxPerTxExceeded();
error InvalidPurchaseValue();
error OnlySongContractCanBurn();
error LengthMismatch();
error SongContractLocked();

/// @title Chaos Packs
/// @notice Sale contract for Songcamp Chaos Packs
contract ChaosPacks is ERC721A, Ownable, IERC2981Royalties {
    using SafeTransferLib for address payable;
    using Strings for uint256;

    uint256 constant MAX_PER_MINT = 100; /*Don't let people buy more than 100 per transaction*/
    uint256 reserved; /*Max amount for reserve*/
    uint256 immutable maxSupply; /*Max token ID - set in constructor*/
    uint256 public constant PRICE = 0.2 ether; /*Public sale price*/

    address public songContract; /*Address that can burn packs to open them*/
    bool public songContractLocked; /*Allow song contract to be locked against further change*/

    uint256 public royaltyPoints; /*Royalty percentage / 10000*/

    string public contractURI; /*contractURI contract metadata json*/

    address payable public ethSink; /*recipient for ETH*/
    string public baseURI; /*baseURI_ String to prepend to token IDs*/

    bool public saleEnabled; /*Sale disabled by default*/

    mapping(address => uint256) lastCallFrom; /*Track last call to prevent contract bots*/

    modifier oncePerBlock() {
        if (msg.sender != tx.origin) {
            /*If caller is a contract only allow one call per block*/
            if (lastCallFrom[tx.origin] == block.number) {
                revert OnlyOneCallPerBlockForNonEOA();
            }
            lastCallFrom[tx.origin] = block.number; /*Store block to check on next mint*/
        }
        _;
    }

    /// @notice Constructor sets contract metadata configurations and sale configurations
    /// @param baseURI_ Base URI for token metadata
    /// @param _contractURI URI for marketplace contract metadata
    /// @param _reserved Max amount that can be minted by admin
    /// @param _maxSupply Max amount that can be minted total
    /// @param _sink Destination for sale ETH
    /// @param _royaltyPoints BP of royalties to send to song contract
    constructor(
        string memory baseURI_,
        string memory _contractURI,
        uint256 _reserved,
        uint256 _maxSupply,
        uint256 _royaltyPoints,
        address payable _sink
    ) ERC721A("Chaos Packs", "\u0024PACKS") {
        ethSink = _sink; /*Set the ETH destination - should be immutable split*/
        contractURI = _contractURI; /*Set contract metadata*/
        baseURI = baseURI_; /*Set token metadata*/

        reserved = _reserved; /*Set max admin mint*/
        maxSupply = _maxSupply; /*Set max total mint*/

        royaltyPoints = _royaltyPoints; /*Set royalty amount out of 10000*/
    }

    /*****************
    EXTERNAL MINTING FUNCTIONS
    *****************/
    /// @notice Mint pack by anyone
    /// @dev Sale state must be enabled
    /// @param _quantity How many tokens to buy - up to 100 at a time
    function purchase(uint256 _quantity) external payable oncePerBlock {
        if (!saleEnabled) revert SaleDisabled(); /*Sale must be enabled*/
        if (msg.value != (PRICE * _quantity)) revert InvalidPurchaseValue(); /*Purchase price must be exact*/
        if ((totalSupply() + _quantity) > maxSupply) revert MaxSupplyExceeded(); /*Check against max supply*/
        if (_quantity > MAX_PER_MINT) revert MaxPerTxExceeded(); /*Check against max per mint*/

        _safeMint(msg.sender, _quantity); /*Mint packs to sender*/
    }

    /// @notice Mint special reserve by owner
    /// @param _tos Addresses to mint tokens to
    /// @param _amounts How many tokens to mint
    function batchMintReserve(
        address[] calldata _tos,
        uint256[] calldata _amounts
    ) external onlyOwner {
        if (_tos.length != _amounts.length) revert LengthMismatch();
        for (uint256 index = 0; index < _tos.length; index++) {
            _mintReserve(_amounts[index], _tos[index]);
        }
    }

    /// @notice Mint special reserve by owner
    /// @param _to Address to mint tokens to
    /// @param _quantity How many tokens to mint
    function mintReserve(uint256 _quantity, address _to) external onlyOwner {
        _mintReserve(_quantity, _to);
    }

    /*****************
    INTERNAL MINTING FUNCTIONS
    *****************/
    /// @notice Mint special reserve by owner
    /// @param _to Address to mint tokens to
    /// @param _quantity How many tokens to mint
    function _mintReserve(uint256 _quantity, address _to) internal {
        if (_quantity > reserved) revert MaxReserveExceeded(); /*Check against max admin mint*/
        if ((totalSupply() + _quantity) > maxSupply)
            /*Check against max supply*/
            revert MaxSupplyExceeded();
        reserved -= _quantity; /*Decrement reserve*/
        _safeMint(_to, _quantity); /*Mint packs to specified destination*/
    }

    /*****************
    PACK OPENING
    *****************/
    /// @notice Burn pack by song contract
    /// @param _packId Which pack to burn
    function burnPack(uint256 _packId) external returns (bool) {
        if (msg.sender != songContract) revert OnlySongContractCanBurn(); /*Packs can only be burned by opening in song contract*/
        _burn(_packId); /*Burn the pack*/
        return true;
    }

    /*****************
    CONFIG FUNCTIONS
    *****************/
    /// @notice Set sale proceeds address
    /// @param _sink new sink
    function setSink(address payable _sink) external onlyOwner {
        ethSink = _sink;
    }

    /// @notice Set states enabled or disabled as owner
    /// @param _enabled specified state on or off
    function setSaleEnabled(bool _enabled) external onlyOwner {
        saleEnabled = _enabled;
    }

    /// @notice Set royalty percentage
    /// @param _royaltyPoints Royalty percentage out of 10000
    function setRoyaltyPoints(uint256 _royaltyPoints) external onlyOwner {
        royaltyPoints = _royaltyPoints;
    }

    /// @notice Set song contract as owner
    /// @param _songContract Song contract address
    function setSongContract(address _songContract) external onlyOwner {
        if (songContractLocked) revert SongContractLocked();
        songContract = _songContract;
    }

    /// @notice Lock song contract against further changes
    function lockSongContract() external onlyOwner {
        if (songContractLocked) revert SongContractLocked();
        songContractLocked = true;
    }

    /// @notice Set new base URI
    /// @param baseURI_ String to prepend to token IDs
    function setBaseURI(string memory baseURI_) external onlyOwner {
        baseURI = baseURI_;
    }

    /// @notice Set new contract URI
    /// @param _contractURI Contract metadata json
    function setContractURI(string memory _contractURI) external onlyOwner {
        contractURI = _contractURI;
    }

    /*****************
    DISTRIBUTION FUNCTIONS
    *****************/
    /// @notice Withdraw sale proceeds to sink
    function withdrawToSink() external onlyOwner {
        ethSink.safeTransferETH(address(this).balance);
    }

    /*****************
    Public view interfaces
    *****************/
    function tokenURI(uint256 tokenId)
        public
        view
        override
        returns (string memory)
    {
        if (!_exists(tokenId)) revert URIQueryForNonexistentToken();

        return
            bytes(baseURI).length > 0
                ? string(abi.encodePacked(baseURI, tokenId.toString(), ".json"))
                : "";
    }

    /// @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 _value - 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 value sale price
    function royaltyInfo(uint256 _tokenId, uint256 _value)
        external
        view
        override(IERC2981Royalties)
        returns (address _receiver, uint256 _royaltyAmount)
    {
        return (songContract, (_value * royaltyPoints) / 10000);
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.4;

import {ERC20} from '@rari-capital/solmate/src/tokens/ERC20.sol';

/**
 * @title ISplitMain
 * @author 0xSplits <[email protected]>
 */
interface ISplitMain {
  /**
   * FUNCTIONS
   */

  function walletImplementation() external returns (address);

  function createSplit(
    address[] calldata accounts,
    uint32[] calldata percentAllocations,
    uint32 distributorFee,
    address controller
  ) external returns (address);

  function predictImmutableSplitAddress(
    address[] calldata accounts,
    uint32[] calldata percentAllocations,
    uint32 distributorFee
  ) external view returns (address);

  function updateSplit(
    address split,
    address[] calldata accounts,
    uint32[] calldata percentAllocations,
    uint32 distributorFee
  ) external;

  function transferControl(address split, address newController) external;

  function cancelControlTransfer(address split) external;

  function acceptControl(address split) external;

  function makeSplitImmutable(address split) external;

  function distributeETH(
    address split,
    address[] calldata accounts,
    uint32[] calldata percentAllocations,
    uint32 distributorFee,
    address distributorAddress
  ) external;

  function updateAndDistributeETH(
    address split,
    address[] calldata accounts,
    uint32[] calldata percentAllocations,
    uint32 distributorFee,
    address distributorAddress
  ) external;

  function distributeERC20(
    address split,
    ERC20 token,
    address[] calldata accounts,
    uint32[] calldata percentAllocations,
    uint32 distributorFee,
    address distributorAddress
  ) external;

  function updateAndDistributeERC20(
    address split,
    ERC20 token,
    address[] calldata accounts,
    uint32[] calldata percentAllocations,
    uint32 distributorFee,
    address distributorAddress
  ) external;

  function withdraw(
    address account,
    uint256 withdrawETH,
    ERC20[] calldata tokens
  ) external;

  /**
   * EVENTS
   */

  /** @notice emitted after each successful split creation
   *  @param split Address of the created split
   */
  event CreateSplit(address indexed split);

  /** @notice emitted after each successful split update
   *  @param split Address of the updated split
   */
  event UpdateSplit(address indexed split);

  /** @notice emitted after each initiated split control transfer
   *  @param split Address of the split control transfer was initiated for
   *  @param newPotentialController Address of the split's new potential controller
   */
  event InitiateControlTransfer(
    address indexed split,
    address indexed newPotentialController
  );

  /** @notice emitted after each canceled split control transfer
   *  @param split Address of the split control transfer was canceled for
   */
  event CancelControlTransfer(address indexed split);

  /** @notice emitted after each successful split control transfer
   *  @param split Address of the split control was transferred for
   *  @param previousController Address of the split's previous controller
   *  @param newController Address of the split's new controller
   */
  event ControlTransfer(
    address indexed split,
    address indexed previousController,
    address indexed newController
  );

  /** @notice emitted after each successful ETH balance split
   *  @param split Address of the split that distributed its balance
   *  @param amount Amount of ETH distributed
   *  @param distributorAddress Address to credit distributor fee to
   */
  event DistributeETH(
    address indexed split,
    uint256 amount,
    address indexed distributorAddress
  );

  /** @notice emitted after each successful ERC20 balance split
   *  @param split Address of the split that distributed its balance
   *  @param token Address of ERC20 distributed
   *  @param amount Amount of ERC20 distributed
   *  @param distributorAddress Address to credit distributor fee to
   */
  event DistributeERC20(
    address indexed split,
    ERC20 indexed token,
    uint256 amount,
    address indexed distributorAddress
  );

  /** @notice emitted after each successful withdrawal
   *  @param account Address that funds were withdrawn to
   *  @param ethAmount Amount of ETH withdrawn
   *  @param tokens Addresses of ERC20s withdrawn
   *  @param tokenAmounts Amounts of corresponding ERC20s withdrawn
   */
  event Withdrawal(
    address indexed account,
    uint256 ethAmount,
    ERC20[] tokens,
    uint256[] tokenAmounts
  );
}

// SPDX-License-Identifier: MIT
// Creator: Chiru Labs

pragma solidity ^0.8.4;

import "../ERC721A.sol";

/**
 * @title ERC721A Burnable Token
 * @dev ERC721A Token that can be irreversibly burned (destroyed).
 */
abstract contract ERC721ABurnable is ERC721A {
    /**
     * @dev Burns `tokenId`. See {ERC721A-_burn}.
     *
     * Requirements:
     *
     * - The caller must own `tokenId` or be an approved operator.
     */
    function burn(uint256 tokenId) public virtual {
        _burn(tokenId, true);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.4;

/// @title BatchShuffle
/// @notice Assign random offsets based on seed input. Remove selected offset from set so it cannot be used multiple times
abstract contract BatchShuffle {
    uint256 internal immutable _batchSize; /*Number of consecutive tokens using the same offset*/
    uint256 internal immutable _startShuffledId; /*Offset to add to all token IDs*/

    mapping(uint256 => uint16) public availableIds; /*Mapping to use to track used offsets*/
    uint16 public availableCount; /*Track the available count to know the id of the current max offset*/
    mapping(uint256 => uint256) public offsets; /*Store offsets once found*/

    /// @notice Constructor sets the shuffle parameters
    /// @param _availableCount Max number of offsets
    /// @param batchSize_ Number of consecutive tokens using the same offset
    /// @param startShuffledId_ Offset to add to all token IDs
    constructor(
        uint16 _availableCount,
        uint256 batchSize_,
        uint256 startShuffledId_
    ) {
        availableCount = _availableCount; /*Set max offsets*/
        _batchSize = batchSize_; /*Set consecutive tokens using same offset*/
        _startShuffledId = startShuffledId_; /*Set offset for all token IDs*/
    }

    /// @notice Set offset at index using seed
    /// @param _index Offset to set
    /// @param _seed Number fr RNG
    function _setNextOffset(uint256 _index, uint256 _seed) internal {
        require(availableCount > 0, "Sold out"); /*Revert once we use up all indices*/
        // Get index of ID to mint from available ids
        uint256 swapIndex = _seed % availableCount;
        // Load in new id
        uint256 newId = availableIds[swapIndex];
        // If unset, assume equals index
        if (newId == 0) {
            newId = swapIndex;
        }
        uint16 lastIndex = availableCount - 1;
        uint16 lastId = availableIds[lastIndex];
        if (lastId == 0) {
            lastId = lastIndex;
        }
        // Set last value as swapped index
        availableIds[swapIndex] = lastId;

        availableCount--;

        offsets[_index] = newId;
    }

    /// @dev Get the token ID to use for URI of a token ID
    /// @param _tokenId Token to check
    function getShuffledTokenId(uint256 _tokenId)
        public
        view
        returns (uint256)
    {
        uint256 _batchIndex = _tokenId % _batchSize; /*Get the offset within the batch*/
        uint256 _batchStart = _tokenId - _batchIndex; /*Offsets are stored for batches of 4 consecutive songs*/
        uint256 _offset = offsets[_batchStart];
        uint256 _shuffledTokenId = (_offset * _batchSize) +
            _startShuffledId +
            _batchIndex; /*Add to token ID to get shuffled ID*/

        return _shuffledTokenId;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/// @title IERC2981Royalties
/// @dev Interface for the ERC2981 - Token Royalty standard
interface IERC2981Royalties {
    /// @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 _value - 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 value sale price
    function royaltyInfo(uint256 _tokenId, uint256 _value)
        external
        view
        returns (address _receiver, uint256 _royaltyAmount);
}

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

pragma solidity ^0.8.0;

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

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

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Modern and gas efficient ERC20 + EIP-2612 implementation.
/// @author Solmate (https://github.com/Rari-Capital/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol)
/// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it.
abstract contract ERC20 {
    /*///////////////////////////////////////////////////////////////
                                  EVENTS
    //////////////////////////////////////////////////////////////*/

    event Transfer(address indexed from, address indexed to, uint256 amount);

    event Approval(address indexed owner, address indexed spender, uint256 amount);

    /*///////////////////////////////////////////////////////////////
                             METADATA STORAGE
    //////////////////////////////////////////////////////////////*/

    string public name;

    string public symbol;

    uint8 public immutable decimals;

    /*///////////////////////////////////////////////////////////////
                              ERC20 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 public totalSupply;

    mapping(address => uint256) public balanceOf;

    mapping(address => mapping(address => uint256)) public allowance;

    /*///////////////////////////////////////////////////////////////
                             EIP-2612 STORAGE
    //////////////////////////////////////////////////////////////*/

    bytes32 public constant PERMIT_TYPEHASH =
        keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");

    uint256 internal immutable INITIAL_CHAIN_ID;

    bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;

    mapping(address => uint256) public nonces;

    /*///////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;

        INITIAL_CHAIN_ID = block.chainid;
        INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator();
    }

    /*///////////////////////////////////////////////////////////////
                              ERC20 LOGIC
    //////////////////////////////////////////////////////////////*/

    function approve(address spender, uint256 amount) public virtual returns (bool) {
        allowance[msg.sender][spender] = amount;

        emit Approval(msg.sender, spender, amount);

        return true;
    }

    function transfer(address to, uint256 amount) public virtual returns (bool) {
        balanceOf[msg.sender] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(msg.sender, to, amount);

        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual returns (bool) {
        uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.

        if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;

        balanceOf[from] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(from, to, amount);

        return true;
    }

    /*///////////////////////////////////////////////////////////////
                              EIP-2612 LOGIC
    //////////////////////////////////////////////////////////////*/

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual {
        require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED");

        // Unchecked because the only math done is incrementing
        // the owner's nonce which cannot realistically overflow.
        unchecked {
            bytes32 digest = keccak256(
                abi.encodePacked(
                    "\x19\x01",
                    DOMAIN_SEPARATOR(),
                    keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
                )
            );

            address recoveredAddress = ecrecover(digest, v, r, s);

            require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER");

            allowance[recoveredAddress][spender] = value;
        }

        emit Approval(owner, spender, value);
    }

    function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
        return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator();
    }

    function computeDomainSeparator() internal view virtual returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                    keccak256(bytes(name)),
                    keccak256("1"),
                    block.chainid,
                    address(this)
                )
            );
    }

    /*///////////////////////////////////////////////////////////////
                       INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    function _mint(address to, uint256 amount) internal virtual {
        totalSupply += amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(address(0), to, amount);
    }

    function _burn(address from, uint256 amount) internal virtual {
        balanceOf[from] -= amount;

        // Cannot underflow because a user's balance
        // will never be larger than the total supply.
        unchecked {
            totalSupply -= amount;
        }

        emit Transfer(from, address(0), amount);
    }
}

// SPDX-License-Identifier: MIT
// Creator: Chiru Labs

pragma solidity ^0.8.4;

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts/utils/introspection/ERC165.sol";

error ApprovalCallerNotOwnerNorApproved();
error ApprovalQueryForNonexistentToken();
error ApproveToCaller();
error ApprovalToCurrentOwner();
error BalanceQueryForZeroAddress();
error MintToZeroAddress();
error MintZeroQuantity();
error OwnerQueryForNonexistentToken();
error TransferCallerNotOwnerNorApproved();
error TransferFromIncorrectOwner();
error TransferToNonERC721ReceiverImplementer();
error TransferToZeroAddress();
error URIQueryForNonexistentToken();

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension. Built to optimize for lower gas during batch mints.
 *
 * Assumes serials are sequentially minted starting at _startTokenId() (defaults to 0, e.g. 0, 1, 2, 3..).
 *
 * Assumes that an owner cannot have more than 2**64 - 1 (max value of uint64) of supply.
 *
 * Assumes that the maximum token id cannot exceed 2**256 - 1 (max value of uint256).
 */
contract ERC721A is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Compiler will pack this into a single 256bit word.
    struct TokenOwnership {
        // The address of the owner.
        address addr;
        // Keeps track of the start time of ownership with minimal overhead for tokenomics.
        uint64 startTimestamp;
        // Whether the token has been burned.
        bool burned;
    }

    // Compiler will pack this into a single 256bit word.
    struct AddressData {
        // Realistically, 2**64-1 is more than enough.
        uint64 balance;
        // Keeps track of mint count with minimal overhead for tokenomics.
        uint64 numberMinted;
        // Keeps track of burn count with minimal overhead for tokenomics.
        uint64 numberBurned;
        // For miscellaneous variable(s) pertaining to the address
        // (e.g. number of whitelist mint slots used).
        // If there are multiple variables, please pack them into a uint64.
        uint64 aux;
    }

    // The tokenId of the next token to be minted.
    uint256 internal _currentIndex;

    // The number of tokens burned.
    uint256 internal _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 _ownershipOf implementation for details.
    mapping(uint256 => TokenOwnership) internal _ownerships;

    // Mapping owner address to address data
    mapping(address => AddressData) private _addressData;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

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

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

    /**
     * To change the starting tokenId, please override this function.
     */
    function _startTokenId() internal view virtual returns (uint256) {
        return 0;
    }

    /**
     * @dev Burned tokens are calculated here, use _totalMinted() if you want to count just minted tokens.
     */
    function totalSupply() public view returns (uint256) {
        // Counter underflow is impossible as _burnCounter cannot be incremented
        // more than _currentIndex - _startTokenId() times
        unchecked {
            return _currentIndex - _burnCounter - _startTokenId();
        }
    }

    /**
     * Returns the total amount of tokens minted in the contract.
     */
    function _totalMinted() internal view returns (uint256) {
        // Counter underflow is impossible as _currentIndex does not decrement,
        // and it is initialized to _startTokenId()
        unchecked {
            return _currentIndex - _startTokenId();
        }
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId)
        public
        view
        virtual
        override(ERC165, IERC165)
        returns (bool)
    {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view override returns (uint256) {
        if (owner == address(0)) revert BalanceQueryForZeroAddress();
        return uint256(_addressData[owner].balance);
    }

    /**
     * Returns the number of tokens minted by `owner`.
     */
    function _numberMinted(address owner) internal view returns (uint256) {
        return uint256(_addressData[owner].numberMinted);
    }

    /**
     * Returns the number of tokens burned by or on behalf of `owner`.
     */
    function _numberBurned(address owner) internal view returns (uint256) {
        return uint256(_addressData[owner].numberBurned);
    }

    /**
     * Returns the auxillary data for `owner`. (e.g. number of whitelist mint slots used).
     */
    function _getAux(address owner) internal view returns (uint64) {
        return _addressData[owner].aux;
    }

    /**
     * Sets the auxillary data for `owner`. (e.g. number of whitelist mint slots used).
     * If there are multiple variables, please pack them into a uint64.
     */
    function _setAux(address owner, uint64 aux) internal {
        _addressData[owner].aux = aux;
    }

    /**
     * Gas spent here starts off proportional to the maximum mint batch size.
     * It gradually moves to O(1) as tokens get transferred around in the collection over time.
     */
    function _ownershipOf(uint256 tokenId)
        internal
        view
        returns (TokenOwnership memory)
    {
        uint256 curr = tokenId;

        unchecked {
            if (_startTokenId() <= curr && curr < _currentIndex) {
                TokenOwnership memory ownership = _ownerships[curr];
                if (!ownership.burned) {
                    if (ownership.addr != address(0)) {
                        return ownership;
                    }
                    // Invariant:
                    // There will always be an ownership that has an address and is not burned
                    // before an ownership that does not have an address and is not burned.
                    // Hence, curr will not underflow.
                    while (true) {
                        curr--;
                        ownership = _ownerships[curr];
                        if (ownership.addr != address(0)) {
                            return ownership;
                        }
                    }
                }
            }
        }
        revert OwnerQueryForNonexistentToken();
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view override returns (address) {
        return _ownershipOf(tokenId).addr;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId)
        public
        view
        virtual
        override
        returns (string memory)
    {
        if (!_exists(tokenId)) revert URIQueryForNonexistentToken();

        string memory baseURI = _baseURI();
        return
            bytes(baseURI).length != 0
                ? string(abi.encodePacked(baseURI, tokenId.toString()))
                : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overriden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public override {
        address owner = ERC721A.ownerOf(tokenId);
        if (to == owner) revert ApprovalToCurrentOwner();

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

        _approve(to, tokenId, owner);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId)
        public
        view
        override
        returns (address)
    {
        if (!_exists(tokenId)) revert ApprovalQueryForNonexistentToken();

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved)
        public
        virtual
        override
    {
        if (operator == _msgSender()) revert ApproveToCaller();

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

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator)
        public
        view
        virtual
        override
        returns (bool)
    {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        _transfer(from, to, tokenId);
        if (
            to.isContract() &&
            !_checkContractOnERC721Received(from, to, tokenId, _data)
        ) {
            revert TransferToNonERC721ReceiverImplementer();
        }
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     */
    function _exists(uint256 tokenId) internal view returns (bool) {
        return
            _startTokenId() <= tokenId &&
            tokenId < _currentIndex &&
            !_ownerships[tokenId].burned;
    }

    function _safeMint(address to, uint256 quantity) internal {
        _safeMint(to, quantity, "");
    }

    /**
     * @dev Safely mints `quantity` tokens and transfers them to `to`.
     *
     * Requirements:
     *
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called for each safe transfer.
     * - `quantity` must be greater than 0.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(
        address to,
        uint256 quantity,
        bytes memory _data
    ) internal {
        _mint(to, quantity, _data, true);
    }

    /**
     * @dev Mints `quantity` tokens and transfers them to `to`.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `quantity` must be greater than 0.
     *
     * Emits a {Transfer} event.
     */
    function _mint(
        address to,
        uint256 quantity,
        bytes memory _data,
        bool safe
    ) internal {
        uint256 startTokenId = _currentIndex;
        if (to == address(0)) revert MintToZeroAddress();
        if (quantity == 0) revert MintZeroQuantity();

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

        // Overflows are incredibly unrealistic.
        // balance or numberMinted overflow if current value of either + quantity > 1.8e19 (2**64) - 1
        // updatedIndex overflows if _currentIndex + quantity > 1.2e77 (2**256) - 1
        unchecked {
            _addressData[to].balance += uint64(quantity);
            _addressData[to].numberMinted += uint64(quantity);

            _ownerships[startTokenId].addr = to;
            _ownerships[startTokenId].startTimestamp = uint64(block.timestamp);

            uint256 updatedIndex = startTokenId;
            uint256 end = updatedIndex + quantity;

            if (safe && to.isContract()) {
                do {
                    emit Transfer(address(0), to, updatedIndex);
                    if (
                        !_checkContractOnERC721Received(
                            address(0),
                            to,
                            updatedIndex++,
                            _data
                        )
                    ) {
                        revert TransferToNonERC721ReceiverImplementer();
                    }
                } while (updatedIndex != end);
                // Reentrancy protection
                if (_currentIndex != startTokenId) revert();
            } else {
                do {
                    emit Transfer(address(0), to, updatedIndex++);
                } while (updatedIndex != end);
            }
            _currentIndex = updatedIndex;
        }
        _afterTokenTransfers(address(0), to, startTokenId, quantity);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) private {
        TokenOwnership memory prevOwnership = _ownershipOf(tokenId);

        if (prevOwnership.addr != from) revert TransferFromIncorrectOwner();

        bool isApprovedOrOwner = (_msgSender() == from ||
            isApprovedForAll(from, _msgSender()) ||
            getApproved(tokenId) == _msgSender());

        if (!isApprovedOrOwner) revert TransferCallerNotOwnerNorApproved();
        if (to == address(0)) revert TransferToZeroAddress();

        _beforeTokenTransfers(from, to, tokenId, 1);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId, from);

        // 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 {
            _addressData[from].balance -= 1;
            _addressData[to].balance += 1;

            TokenOwnership storage currSlot = _ownerships[tokenId];
            currSlot.addr = to;
            currSlot.startTimestamp = uint64(block.timestamp);

            // If the ownership slot of tokenId+1 is not explicitly set, that means the transfer initiator owns it.
            // Set the slot of tokenId+1 explicitly in storage to maintain correctness for ownerOf(tokenId+1) calls.
            uint256 nextTokenId = tokenId + 1;
            TokenOwnership storage nextSlot = _ownerships[nextTokenId];
            if (nextSlot.addr == address(0)) {
                // This will suffice for checking _exists(nextTokenId),
                // as a burned slot cannot contain the zero address.
                if (nextTokenId != _currentIndex) {
                    nextSlot.addr = from;
                    nextSlot.startTimestamp = prevOwnership.startTimestamp;
                }
            }
        }

        emit Transfer(from, to, tokenId);
        _afterTokenTransfers(from, to, tokenId, 1);
    }

    /**
     * @dev This is 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 {
        TokenOwnership memory prevOwnership = _ownershipOf(tokenId);

        address from = prevOwnership.addr;

        if (approvalCheck) {
            bool isApprovedOrOwner = (_msgSender() == from ||
                isApprovedForAll(from, _msgSender()) ||
                getApproved(tokenId) == _msgSender());

            if (!isApprovedOrOwner) revert TransferCallerNotOwnerNorApproved();
        }

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

        // Clear approvals from the previous owner
        _approve(address(0), tokenId, from);

        // 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 {
            AddressData storage addressData = _addressData[from];
            addressData.balance -= 1;
            addressData.numberBurned += 1;

            // Keep track of who burned the token, and the timestamp of burning.
            TokenOwnership storage currSlot = _ownerships[tokenId];
            currSlot.addr = from;
            currSlot.startTimestamp = uint64(block.timestamp);
            currSlot.burned = true;

            // If the ownership slot of tokenId+1 is not explicitly set, that means the burn initiator owns it.
            // Set the slot of tokenId+1 explicitly in storage to maintain correctness for ownerOf(tokenId+1) calls.
            uint256 nextTokenId = tokenId + 1;
            TokenOwnership storage nextSlot = _ownerships[nextTokenId];
            if (nextSlot.addr == address(0)) {
                // This will suffice for checking _exists(nextTokenId),
                // as a burned slot cannot contain the zero address.
                if (nextTokenId != _currentIndex) {
                    nextSlot.addr = from;
                    nextSlot.startTimestamp = prevOwnership.startTimestamp;
                }
            }
        }

        emit Transfer(from, address(0), tokenId);
        _afterTokenTransfers(from, address(0), tokenId, 1);

        // Overflow not possible, as _burnCounter cannot be exceed _currentIndex times.
        unchecked {
            _burnCounter++;
        }
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(
        address to,
        uint256 tokenId,
        address owner
    ) internal {
        _tokenApprovals[tokenId] = to;
        emit Approval(owner, to, tokenId);
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkContractOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        try
            IERC721Receiver(to).onERC721Received(
                _msgSender(),
                from,
                tokenId,
                _data
            )
        returns (bytes4 retval) {
            return retval == IERC721Receiver(to).onERC721Received.selector;
        } catch (bytes memory reason) {
            if (reason.length == 0) {
                revert TransferToNonERC721ReceiverImplementer();
            } else {
                assembly {
                    revert(add(32, reason), mload(reason))
                }
            }
        }
    }

    /**
     * @dev Hook that is called before a set of serially-ordered token ids are about to be transferred. This includes minting.
     * And also called before burning one token.
     *
     * startTokenId - the first token id to be transferred
     * quantity - the amount to be transferred
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, `from`'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, `tokenId` will be burned by `from`.
     * - `from` and `to` are never both zero.
     */
    function _beforeTokenTransfers(
        address from,
        address to,
        uint256 startTokenId,
        uint256 quantity
    ) internal virtual {}

    /**
     * @dev Hook that is called after a set of serially-ordered token ids have been transferred. This includes
     * minting.
     * And also called after one token has been burned.
     *
     * startTokenId - the first token id to be transferred
     * quantity - the amount to be transferred
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, `from`'s `tokenId` has been
     * transferred to `to`.
     * - When `from` is zero, `tokenId` has been minted for `to`.
     * - When `to` is zero, `tokenId` has been burned by `from`.
     * - `from` and `to` are never both zero.
     */
    function _afterTokenTransfers(
        address from,
        address to,
        uint256 startTokenId,
        uint256 quantity
    ) internal virtual {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @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 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);

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

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

pragma solidity ^0.8.0;

import "./IERC165.sol";

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

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

pragma solidity ^0.8.0;

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

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

• No Contract Security Audit Submitted- Submit Audit Here

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ERC20","name":"token","type":"address"},{"internalType":"address","name":"distributorAddress","type":"address"}],"name":"distributeERC20","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"accounts","type":"address[]"},{"internalType":"address","name":"distributorAddress","type":"address"}],"name":"distributeETH","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"distributorFee","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"getShuffledTokenId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"getSongTokenId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lockPackAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"mintSupercharged","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"offsets","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_packId","type":"uint256"}],"name":"openPack","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"packContract","outputs":[{"internalType":"contract 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-----Decoded View---------------
Arg [0] : baseURI_ (string): ipfs://bafybeidiwwgmfv74j3zse4ug26jzaxeyymcuolp5cjumue5mvnovygh56y/
Arg [1] : _contractURI (string): ipfs://QmV2BEKnud4waoQgknzBWvFmwCqEKc5vu2Efh1WbGpfNSL
Arg [2] : _splitMain (address): 0x2ed6c4B5dA6378c7897AC67Ba9e43102Feb694EE
Arg [3] : _royaltyPoints (uint256): 750
Arg [4] : _distributorFee (uint32): 0

-----Encoded View---------------
12 Constructor Arguments found :
Arg [0] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000120
Arg [2] : 0000000000000000000000002ed6c4b5da6378c7897ac67ba9e43102feb694ee
Arg [3] : 00000000000000000000000000000000000000000000000000000000000002ee
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000043
Arg [6] : 697066733a2f2f6261667962656964697777676d667637346a337a7365347567
Arg [7] : 32366a7a61786579796d63756f6c7035636a756d7565356d766e6f7679676835
Arg [8] : 36792f0000000000000000000000000000000000000000000000000000000000
Arg [9] : 0000000000000000000000000000000000000000000000000000000000000035
Arg [10] : 697066733a2f2f516d563242454b6e75643477616f51676b6e7a425776466d77
Arg [11] : 4371454b63357675324566683157624770664e534c0000000000000000000000