// SPDX-License-Identifier: MIT
pragma solidity 0.8.12;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";

contract ProjectNFT is ERC721 {

    uint256 private totalSupply;
    string private ipfsBaseURI;

    constructor(string memory _name, string memory _symbol, string memory baseURI)
        ERC721(_name, _symbol) {
            ipfsBaseURI = baseURI;
        }

    function mint() public {
        totalSupply++;
        _safeMint(msg.sender, totalSupply);
    }

    function _baseURI() internal view override returns (string memory) {
        return ipfsBaseURI;
    }

		//In order to see the unique uri of the NFT
		//return uri for certain token
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "Nonexistent token");
  
        return bytes(ipfsBaseURI).length > 0 ? string(abi.encodePacked(ipfsBaseURI, tokenId.toString(), ".json")) : "";
    }

}