contract RoboCats is ERC721Enumerable, Ownable {
  using Strings for uint256;

  string public baseURI;
  uint256 public robocatsPrice = 0.04 ether;
  uint256 public MAX_ROBOCATS = 10000;
  uint256 public maxRobocatsPurchase = 20;
  bool public mintIsActive;

  address private _withdraw = 0x200e8091F44785099cCe120283f81BB5B9A54D57;

  constructor(
    string memory _name,
    string memory _symbol,
    string memory _initBaseURI
  ) ERC721(_name, _symbol) {
    setBaseURI(_initBaseURI);
  }

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

  // public
  function mintRobocats(uint256 numberOfTokens) public payable {
    uint256 supply = totalSupply();
  require(mintIsActive, 'MINT_CLOSED');
    require(numberOfTokens > 0);
    require(numberOfTokens <= maxRobocatsPurchase);
    require(supply + numberOfTokens <= MAX_ROBOCATS);

    if (msg.sender != owner()) {
          require(msg.value >= robocatsPrice * numberOfTokens);
    }

    for (uint256 i = 0; i <= numberOfTokens; i++) {
      _safeMint(msg.sender, supply + i);
    }
  }

  function walletOfOwner(address _owner)
    public
    view
    returns (uint256[] memory)
  {
    uint256 ownerTokenCount = balanceOf(_owner);
    uint256[] memory tokenIds = new uint256[](ownerTokenCount);
    for (uint256 i; i < ownerTokenCount; i++) {
      tokenIds[i] = tokenOfOwnerByIndex(_owner, i);
    }
    return tokenIds;
  }

  function tokenURI(uint256 tokenId)
    public
    view
    virtual
    override
    returns (string memory)
  {
    require(
      _exists(tokenId),
      "ERC721Metadata: URI query for nonexistent token"
    );

    string memory currentBaseURI = _baseURI();
    return bytes(currentBaseURI).length > 0
        ? string(abi.encodePacked(currentBaseURI, tokenId.toString(), ".json")) : '.json';
  }

  //only owner
  function setrobocatsPrice(uint256 _newrobocatsPrice) public onlyOwner() {
    robocatsPrice = _newrobocatsPrice;
  }

  function setmaxRobocatsPurchase(uint256 _newmaxRobocatsPurchase) public onlyOwner() {
    maxRobocatsPurchase = _newmaxRobocatsPurchase;
  }

  function setBaseURI(string memory _newBaseURI) public onlyOwner {
    baseURI = _newBaseURI;
  }

  function toggleMintStatus() external onlyOwner {
    mintIsActive = !mintIsActive;
  }
 

  function withdraw() external onlyOwner {
    payable(_withdraw).transfer(address(this).balance);
  }
}
function mintRobocats(uint256 numberOfTokens) public payable {
  uint256 supply = totalSupply();
require(mintIsActive, 'MINT_CLOSED');
  require(numberOfTokens > 0);
  require(numberOfTokens <= maxRobocatsPurchase);
  require(supply + numberOfTokens <= MAX_ROBOCATS);

  if (msg.sender != owner()) {
        require(msg.value >= robocatsPrice * numberOfTokens);
  }

  for (uint256 i = 0; i <= numberOfTokens; i++) {
    _safeMint(msg.sender, supply + i);
  }
}

// public