// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

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

contract Soulbound is ERC721Enumerable, Ownable {
  using Counters for Counters.Counter;
  string private _baseTokenURI = "https://market.cebg.games/api/nft/info/";
  uint256 public immutable supplyLimit;

  Counters.Counter private _tokenIdCounter;

  constructor(
    string memory _name,
    string memory _symbol,
    uint256 _supplyLimt
  ) ERC721(_name, _symbol) {
    supplyLimit = _supplyLimt;
  }

  function _beforeTokenTransfer(
    address from,
    address to,
    uint256 tokenId
  ) internal override(ERC721Enumerable) {
    require(from == address(0), "Token not transferable");
    super._beforeTokenTransfer(from, to, tokenId);
  }

  function mint() public {
    if (supplyLimit > 0) {
      require((totalSupply() + 1) <= supplyLimit, "Exceed the total supply");
    }
    address to = msg.sender;
    uint256 tokenId = _tokenIdCounter.current();
    _tokenIdCounter.increment();
    _safeMint(to, tokenId);
  }

  function _baseURI() internal view virtual override returns (string memory) {
    return _baseTokenURI;
  }
}