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// SPDX-License-Identifier: GPL-3.0
  pragma solidity ^0.8.7;
  import "@openzeppelin/contracts/access/Ownable.sol";
  import "erc721a/contracts/ERC721A.sol";                 
  contract Invisibears is Ownable, ERC721A {
      using Strings for uint256;
      string public baseExtension = ".json";
      uint256 public FREE_MINT_SUPPLY = 500;
      uint256 public MAX_MINT_PER_TRANSACTION = 30; 
      uint256 public MAX_FREEMINT_PER_USER = 5; 
      uint256 public totalMaxSupply = 5000; 
      uint256 public mintPrice = 0.009 ether;
      uint64 public startTimestamp;
      bool public mintActive = true;
      string private _baseTokenURI;
    constructor() ERC721A("Invisibears", "IBS") {}
    function mint(uint256 quantity) external payable {
        require(startTimestamp !=0 &&  block.timestamp >= startTimestamp,"Mint is not active yet");
        require(mintActive == true,"Mint have been Paused");
        require(quantity > 0, "Mint quantity should be over 0");
        require(quantity <= MAX_MINT_PER_TRANSACTION, "Max mint per transaction exceeded");
        require(totalSupply() + quantity <= totalMaxSupply, "Reached max supply");
        require(msg.value >= mintPrice * quantity, "Insufficient Funds");
      // _safeMint's second argument now takes in a quantity, not a tokenId.
      _safeMint(msg.sender, quantity);
    }
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