// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;
import "@openzeppelin/contracts/utils/Base64.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Strings.sol";

contract JSONMetadata is Ownable {
  using Strings for uint256;
  string constant _dataUri = "data:application/json;base64,";

  struct MetaData {
    string name;
    string desc;
    string image;
    string external_str;
  }

  mapping(address => MetaData) public metaDatas;

  function getMetaData(
    address token,
    uint256 tokenId
  ) public view returns (string memory) {
    MetaData memory metaData = metaDatas[token];
    string memory external_str;
    if (bytes(metaData.external_str).length > 0) {
      external_str = metaData.external_str;
    }
    bytes memory json = abi.encodePacked(
      '{"name":"',
      metaData.name,
      " #",
      tokenId.toString(),
      '","description":"',
      metaData.desc,
      '","image":"',
      metaData.image,
      '","external_url":"',
      metaData.image,
      '"',
      external_str,
      "}"
    );

    return string(abi.encodePacked(_dataUri, Base64.encode(json)));
  }

  function setMetaData(
    address token,
    string memory name,
    string memory desc,
    string memory image,
    string memory external_str
  ) external onlyOwner {
    MetaData memory metaData = MetaData(name, desc, image, external_str);
    metaDatas[token] = metaData;
  }
}