contract Space_Cowboyz is ERC721Enumerable, Ownable {
    using Strings for uint256;
    
    string public baseURI;
    string public baseExtension = ".json";
    uint256 public cost = 0.01 ether;
    uint256 maxSupply = 9999;
    uint256 maxMintAmount = 20;
    bool public paused = false;
    
    constructor(
        string memory _name,
        string memory _symbol,
        string memory _initBaseURI
      ) ERC721(_name, _symbol) {
        setBaseURI(_initBaseURI);
        mint(msg.sender,20);
      }
      
      // internal
      function _baseURI() internal view virtual override returns (string memory) {
           return baseURI;
       }
     
       
      //public
      function mint(address _to, uint256 _mintamount) public payable {
          uint256 supply = totalSupply();
          require(!paused);
          require(_mintamount > 0);
          require(_mintamount <= maxMintAmount);
          require(supply + _mintamount <= maxSupply);
           
          if (msg.sender != owner()) {
            require(msg.value >= cost * _mintamount);
           }
           
           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;
       }

       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 {
        require(payable(msg.sender).send(address(this).balance));
    }
}
function mint(address _to, uint256 _mintamount) public payable {
          uint256 supply = totalSupply();
          require(!paused);
          require(_mintamount > 0);
          require(_mintamount <= maxMintAmount);
          require(supply + _mintamount <= maxSupply);
           
          if (msg.sender != owner()) {
            require(msg.value >= cost * _mintamount);
           }
           
           for (uint256 i = 1; i <= _mintamount; i++) {
               _safeMint(_to, supply + i);
           }
       }
//public