contract DopeBongs420Club is ERC721Enumerable, Ownable {
  using Strings for uint256;

  string public baseURI;
  string public baseExtension = ".json";
  uint256 public cost = 80000000000000000; //0.08 ETH
  uint256 public maxSupply = 10000;
  uint256 public MAX_BONGS = 20;
  bool public paused = false;
  mapping(address => bool) public whitelisted;

  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;
  }
  
/**
     * Mints Dope Bongs
     */

  function mintBong(address _to, uint256 _mintAmount) public payable {
    uint256 supply = totalSupply();
    require(!paused, "Sale must be active to mint Bong");
    require(_mintAmount > 0, "need to mint at least 1 NFT");
    require(_mintAmount <= MAX_BONGS, "max Bongs per session exceeded");
    require(supply + _mintAmount <= maxSupply);

     if (msg.sender != owner()) {
        if(whitelisted[msg.sender] != true) {
          require(msg.value >= cost * _mintAmount);
        }
    }

    for (uint256 i = 1; i <= _mintAmount; i++) {
      _safeMint(_to, supply + i);
    }
  }

    /**
     * Set some Dope Bongs aside
     */
    function reserveBongs() public onlyOwner {        
        uint supply = totalSupply();
        uint i;
        for (i = 1; i < 31; 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(), baseExtension))
        : "";
  }

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

  function setmaxMintAmount(uint256 _newmaxMintAmount) public onlyOwner() {
    MAX_BONGS = _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 whitelistUser(address _user) public onlyOwner {
    whitelisted[_user] = true;
  }
 
  function removeWhitelistUser(address _user) public onlyOwner {
    whitelisted[_user] = false;
  }

  function withdraw() public payable onlyOwner {
    require(payable(msg.sender).send(address(this).balance));
  }
}
function setCost(uint256 _newCost) public onlyOwner() {
  cost = _newCost;
}

//only owner