contract PantherNFTs is ERC721Enumerable, Ownable, RandomlyAssigned {
  using Strings for uint256;

  string private baseURI;
  string public baseExtension = ".json";
  string public notRevealedUri;
  uint256 public cost = 0.04 ether;
  uint256 public maxSupply = 6666;
  uint256 public serialMaxSupply = 20;
  uint256 public maxMintAmount = 110;
  bool public paused = false;
  bool public revealed = false;
  
  constructor(
    string memory _name,
    string memory _symbol,
    string memory _initBaseURI,
    string memory _initNotRevealedUri
  )  ERC721(_name, _symbol)
  RandomlyAssigned(maxSupply,serialMaxSupply+1)
  {
    setBaseURI(_initBaseURI);
    setNotRevealedURI(_initNotRevealedUri);
    mint(110); // 40 minted for marketing and other for presalers
  }

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

  // public
  function mint(uint256 _mintAmount) public payable {
    uint256 supply = totalSupply();
    require(!paused,"Minting is currently paused");
    require(_mintAmount > 0,"Minimum minting amount is 1");
    require(_mintAmount <= maxMintAmount,"Maximum minting amount is 20");
    require(supply + _mintAmount  <= maxSupply,"minting amount is exceeding total supply");

    if (msg.sender != owner()) {
    require(msg.value >= cost * _mintAmount,"you are sending less ETH than required");
       
    }

    for (uint256 i = 1; i <= _mintAmount; i++) {
        if(supply<serialMaxSupply){
             _safeMint(msg.sender, supply + i);
        }else{
            uint256 nextId = nextToken();
             _safeMint(msg.sender, nextId); 
        }
      
    }
  }
   

  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"
    );
     if(revealed == false) {
        return notRevealedUri;
    }


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

  //only owner
  function setCost(uint256 _newCost) public onlyOwner() {
    cost = _newCost;
  }
 

  function setmaxMintAmount(uint256 _newmaxMintAmount) public onlyOwner() {
    maxMintAmount = _newmaxMintAmount;
  }

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

  function setBaseExtension(string memory _newBaseExtension) public onlyOwner {
    baseExtension = _newBaseExtension;
  }

  function pause(bool _state) public onlyOwner {
    paused = _state;
  }
 
  function withdraw() public payable onlyOwner {
    require(payable(msg.sender).send(address(this).balance));
  }

  
  function reveal() public onlyOwner() {
      revealed = true;
  }

  function setNotRevealedURI(string memory _notRevealedURI) public onlyOwner {
    notRevealedUri = _notRevealedURI;
  }
  
  
}
function mint(uint256 _mintAmount) public payable {
  uint256 supply = totalSupply();
  require(!paused,"Minting is currently paused");
  require(_mintAmount > 0,"Minimum minting amount is 1");
  require(_mintAmount <= maxMintAmount,"Maximum minting amount is 20");
  require(supply + _mintAmount  <= maxSupply,"minting amount is exceeding total supply");

  if (msg.sender != owner()) {
  require(msg.value >= cost * _mintAmount,"you are sending less ETH than required");
       
  }

  for (uint256 i = 1; i <= _mintAmount; i++) {
      if(supply<serialMaxSupply){
           _safeMint(msg.sender, supply + i);
      }else{
          uint256 nextId = nextToken();
           _safeMint(msg.sender, nextId); 
      }
      
  }
}

// public