// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

import "@openzeppelin/contracts@4.8.1/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts@4.8.1/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts@4.8.1/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts@4.8.1/security/Pausable.sol";
import "@openzeppelin/contracts@4.8.1/access/Ownable.sol";
import "@openzeppelin/contracts@4.8.1/utils/Counters.sol";

contract WalnutTTTT is ERC721, ERC721Enumerable, ERC721URIStorage, Pausable, Ownable {
    using Counters for Counters.Counter;

    Counters.Counter private _tokenIdCounter;
    // 最大数量为100
    uint256 MAX_SUPPLy = 1000;

    constructor() ERC721("WalnutTTTT", "WAT") {}

    function pause() public onlyOwner {
        _pause();
    }

    function unpause() public onlyOwner {
        _unpause();
    }

    function safeMint(address to, string memory uri) public  {
        require(_tokenIdCounter.current() <= MAX_SUPPLY, "I'm sorry we reached the cap");
        uint256 tokenId = _tokenIdCounter.current();
        _tokenIdCounter.increment();
        _safeMint(to, tokenId);
        _setTokenURI(tokenId, uri);
    }

    function _beforeTokenTransfer(address from, address to, uint256 tokenId, uint256 batchSize)
        internal
        whenNotPaused
        override(ERC721, ERC721Enumerable)
    {
        super._beforeTokenTransfer(from, to, tokenId, batchSize);
    }

    // The following functions are overrides required by Solidity.

    function _burn(uint256 tokenId) internal override(ERC721, ERC721URIStorage) {
        super._burn(tokenId);
    }

    function tokenURI(uint256 tokenId)
        public
        view
        override(ERC721, ERC721URIStorage)
        returns (string memory)
    {
        return super.tokenURI(tokenId);
    }

    function supportsInterface(bytes4 interfaceId)public
        view
        override(ERC721, ERC721Enumerable)
        returns (bool)
    {
        return super.supportsInterface(interfaceId);
    }
}