abstract contract NPassCore is ERC721Enumerable, ReentrancyGuard, Ownable {
    uint256 public constant MAX_MULTI_MINT_AMOUNT = 10;
    uint256 public constant MAX_N_TOKEN_ID = 8888;

    IN public immutable n;
    bool public immutable onlyNHolders;
    uint16 public immutable reservedAllowance;
    uint16 public reserveMinted;
    uint256 public immutable maxTotalSupply;
    uint256 public immutable priceForNHoldersInWei;
    uint256 public immutable priceForOpenMintInWei;

    /**
     * @notice Construct an NPassCore instance
     * @param name Name of the token
     * @param symbol Symbol of the token
     * @param n_ Address of your n instance (only for testing)
     * @param onlyNHolders_ True if only n tokens holders can mint this token
     * @param maxTotalSupply_ Maximum number of tokens that can ever be minted
     * @param reservedAllowance_ Number of tokens reserved for n token holders
     * @param priceForNHoldersInWei_ Price n token holders need to pay to mint
     * @param priceForOpenMintInWei_ Price open minter need to pay to mint
     */
    constructor(
        string memory name,
        string memory symbol,
        IN n_,
        bool onlyNHolders_,
        uint256 maxTotalSupply_,
        uint16 reservedAllowance_,
        uint256 priceForNHoldersInWei_,
        uint256 priceForOpenMintInWei_
    ) ERC721(name, symbol) {
        require(maxTotalSupply_ > 0, "NPass:INVALID_SUPPLY");
        require(!onlyNHolders_ || (onlyNHolders_ && maxTotalSupply_ <= MAX_N_TOKEN_ID), "NPass:INVALID_SUPPLY");
        require(maxTotalSupply_ >= reservedAllowance_, "NPass:INVALID_ALLOWANCE");
        // If restricted to n token holders we limit max total supply
        n = n_;
        onlyNHolders = onlyNHolders_;
        maxTotalSupply = maxTotalSupply_;
        reservedAllowance = reservedAllowance_;
        priceForNHoldersInWei = priceForNHoldersInWei_;
        priceForOpenMintInWei = priceForOpenMintInWei_;
    }

    /**
     * @notice Calculate the maximum token id that can ever be minted
     * @return Maximum token id
     */
    function maxTokenId() public view returns (uint256) {
        uint256 maxOpenMints = maxTotalSupply - reservedAllowance;
        return MAX_N_TOKEN_ID + maxOpenMints;
    }

    /**
     * @notice Calculate the currently available number of reserved tokens for n token holders
     * @return Reserved mint available
     */
    function nHoldersMintsAvailable() external view returns (uint256) {
        return reservedAllowance - reserveMinted;
    }

    /**
     * @notice Calculate the currently available number of open mints
     * @return Open mint available
     */
    function openMintsAvailable() public view returns (uint256) {
        uint256 maxOpenMints = maxTotalSupply - reservedAllowance;
        uint256 currentOpenMints = totalSupply() - reserveMinted;
        return maxOpenMints - currentOpenMints;
    }

    /**
     * @notice Allows owner to withdraw amount
     */
    function withdrawAll() external onlyOwner {
        payable(owner()).transfer(address(this).balance);
    }
}
/**
 * @title NPassCore contract
 * @author Tony Snark
 * @notice This contract provides basic functionalities to allow minting using the NPass
 * @dev This contract should be used only for testing or testnet deployments
 */
function openMintsAvailable() public view returns (uint256) {
    uint256 maxOpenMints = maxTotalSupply - reservedAllowance;
    uint256 currentOpenMints = totalSupply() - reserveMinted;
    return maxOpenMints - currentOpenMints;
}

/**
 * @notice Calculate the currently available number of open mints
 * @return Open mint available
 */