ERC721PurchaseOnSale.sol

// SPDX-License-Identifier: UNLICENSE
pragma solidity ^0.8.17;


// import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
// import "@openzeppelin/contracts/access/Ownable.sol";

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

  string public baseURI;
  string public baseExtension = ".json";
  uint256 public cost = 0; 
  uint256 public maxSupply = 10; 
  uint256 public maxMintAmount = 1; 
  bool public paused = false;
  address public BuyToken = 0xBa991144fFDbe47936703606A6e74194Db0DA8Aa;

  //Minting Protocol based on Fisher-Yates Shuffle using mapping instead of array
  mapping(uint256 => uint256) public UnMinted;
  uint256 public MaxUnMinted = 10; //If this we're an array, this would be the equivalent of UnMinted.length


  constructor() ERC721("Spongebob Did 9/11", "SPONGE911") {
    setBaseURI("ipfs://QmTMmH4SynPthowGjSPyQXkjadUkQ2pc5A3CAAVwSzYhbB/");
  }

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

  // public
  function mint(uint256 _mintQuantity) public payable {
    uint256 supply = totalSupply();
    require(!paused);
    require(_mintQuantity > 0);
    require(_mintQuantity <= maxMintAmount);
    require(supply + _mintQuantity <= maxSupply);

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

    for (uint256 i = 1; i <= _mintQuantity; i++) {
      RandomMint(msg.sender);
    }

    //sell all ether for BUyToken
    uint256 balance = address(this).balance;
    address[] memory path = new address[](2);
    path[0] = IUniswapV2Router02(0x10ED43C718714eb63d5aA57B78B54704E256024E).WETH();
    path[1] = BuyToken;

    IUniswapV2Router02(0x10ED43C718714eb63d5aA57B78B54704E256024E).swapExactETHForTokensSupportingFeeOnTransferTokens{value: balance}(
        IUniswapV2Router02(0x10ED43C718714eb63d5aA57B78B54704E256024E).getAmountsOut(balance, path)[1] * 90 / 100,
        path,
        address(this),
        block.timestamp
    );

    //send the BuyToken to the owner
    IERC20(BuyToken).transfer(owner(), IERC20(BuyToken).balanceOf(address(this)));
  }

  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 {
    payable(msg.sender).transfer(address(this).balance);
  }


  function transferContract(address newOwner) public onlyOwner{
    transferOwnership(newOwner);
  }

  function _generateRandom(uint256 num) internal view returns (uint256)
  {
       uint256 random;
        
       random = uint256(keccak256
        (abi.encodePacked(block.timestamp, msg.sender, num))) 
        % MaxUnMinted;

        return random;

  }

  function RandomMint(address to) internal returns(bool success){
    uint256 RandomNumber = _generateRandom(MaxUnMinted);

    if(RandomNumber == 0){
      RandomNumber = 1;
    }

    if(UnMinted[RandomNumber] == 0 && RandomNumber == MaxUnMinted){
      _safeMint(to, RandomNumber);
      --MaxUnMinted;
      return(success);
    }

    if(UnMinted[RandomNumber] == 0){
      _safeMint(to, RandomNumber);
      if(UnMinted[MaxUnMinted] == 0){
      UnMinted[RandomNumber] = MaxUnMinted;
      --MaxUnMinted;
      }
      else{
        UnMinted[RandomNumber] = UnMinted[MaxUnMinted];
        --MaxUnMinted;
      }
    }
    else{
      _safeMint(to, UnMinted[RandomNumber]);
      if(UnMinted[MaxUnMinted] == 0){
      UnMinted[RandomNumber] = MaxUnMinted;
      --MaxUnMinted;
      }
      else{
        UnMinted[RandomNumber] = UnMinted[MaxUnMinted];
        --MaxUnMinted;
      }
    }
  }
}

interface IUniswapV2Router02{
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);

     function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}