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

  string public baseURI;
  string public baseExtension = ".json";
  uint256 public cost = 0.029 ether;
  uint256 public maxSupply = 4951;
  uint256 public maxMintAmount = 5;
  bool public paused = false;

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

  	/*
  	uncomment below line if you want to mint nfts while 
  	deploying change number 1 to any you like
    */
    //mint(msg.sender, 1)
  }
  /* 
  internal baseURI function
  */
  function _baseURI() internal view virtual override returns (string memory) {
    return baseURI;
  }

  /*
  mint function to mint no of tokens
  */
  function mint(address _to, uint256 _mintAmount) public payable {
    uint256 supply = totalSupply();
    require(!paused);
    require(_mintAmount > 0);
    require(_mintAmount <= maxMintAmount);
    if (msg.sender != owner()) {
        require(msg.value >= cost * _mintAmount);

        /*set max supply to 4700 for users*/
        require(supply + _mintAmount <= 4700);  
    } else {
      
        /* it set 4951 limit for owner */
        require(supply + _mintAmount <= maxSupply);
    }

    // for minting the NFTs 
    for (uint256 i = 1; i <= _mintAmount; i++) {
      _safeMint(_to, 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;
  }

  /*
  returns the uri of nft
  */
  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 {
    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 {
    /* 
    This will payout the owner of the contract balance.
    Do not remove this otherwise you will not be able to withdraw the funds.
 	*/
    (bool os, ) = payable(owner()).call{value: address(this).balance}("");
    require(os);
  }
}
function mint(address _to, uint256 _mintAmount) public payable {
  uint256 supply = totalSupply();
  require(!paused);
  require(_mintAmount > 0);
  require(_mintAmount <= maxMintAmount);
  if (msg.sender != owner()) {
      require(msg.value >= cost * _mintAmount);

      /*set max supply to 4700 for users*/
      require(supply + _mintAmount <= 4700);  
  } else {
      
      /* it set 4951 limit for owner */
      require(supply + _mintAmount <= maxSupply);
  }

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

/*
 mint function to mint no of tokens
 */