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// SPDX-License-Identifier: MIT
pragma solidity 0.8.15;
import "./ERC721A.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";
import "@openzeppelin/contracts/token/ERC1155/IERC1155.sol";
contract TheChinaNFT is ERC721A, Ownable {
\tusing Strings for uint256;
\tstring private _uriPrefix;
\tstring private _uriSuffix;
\tuint256 public maxSupply;
\tuint256 public presaleSupply;
\tuint256 public maxMintAmountPerAddress;
\tuint256 public maxMintAmountPerAddressForVip;
\tbytes32 private _presaleMerkleRoot;
\tbytes32 private _vipAddressesMerkleRoot;
\tenum SaleState { PAUSED, PRESALE, PUBLIC_SALE }
\tmapping(address => uint256) public helpers;
\tstring private contractMetadataURI;
\tSaleState public saleState;
\tevent SaleStateChanged(SaleState indexed oldSaleState, SaleState indexed newSaleState);
\tevent UriPrefixUpdated(string indexed oldURIprefix, string indexed newURIprefix);
\tevent UriSuffixUpdated(string indexed oldURIsuffix, string indexed newURIsuffix);
\tevent MaxSupplyUpdated(uint256 indexed oldMaxSupply, uint256 indexed newMaxSupply);
\tevent PresaleSupplyUpdated(uint256 indexed oldPresaleSupply, uint256 indexed newPresaleSupply);
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