// SPDX-License-Identifier: MIT
pragma solidity ^0.8.28;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import {FunctionsClient} from "./@chainlink/contracts/src/v0.8/functions/dev/1_0_0/FunctionsClient.sol";
import {ConfirmedOwner} from "./@chainlink/contracts/src/v0.8/shared/access/ConfirmedOwner.sol";
import {FunctionsRequest} from "./@chainlink/contracts/src/v0.8/functions/dev/1_0_0/libraries/FunctionsRequest.sol";

contract FunctionsConsumerExample is FunctionsClient, ConfirmedOwner, ERC721 {
  using FunctionsRequest for FunctionsRequest.Request;

  bytes32 public s_lastRequestId;
  bytes public s_lastResponse;
  bytes public s_lastError;

  uint256 public tokenId;
  mapping(address => bool) public accountMinted;

  error UnexpectedRequestID(bytes32 requestId);

  event Response(bytes32 indexed requestId, bytes response, bytes err);

  constructor(address router) FunctionsClient(router) ConfirmedOwner(msg.sender) ERC721("Credentials", "CRED") {}

  /**
   * @notice Send a simple request
   * @param source JavaScript source code
   * @param encryptedSecretsUrls Encrypted URLs where to fetch user secrets
   * @param donHostedSecretsSlotID Don hosted secrets slotId
   * @param donHostedSecretsVersion Don hosted secrets version
   * @param args List of arguments accessible from within the source code
   * @param bytesArgs Array of bytes arguments, represented as hex strings
   * @param subscriptionId Billing ID
   */
  function sendRequest(
    string memory source,
    bytes memory encryptedSecretsUrls,
    uint8 donHostedSecretsSlotID,
    uint64 donHostedSecretsVersion,
    string[] memory args,
    bytes[] memory bytesArgs,
    uint64 subscriptionId,
    uint32 gasLimit,
    bytes32 donID
  ) external onlyOwner returns (bytes32 requestId) {
    FunctionsRequest.Request memory req;
    req.initializeRequestForInlineJavaScript(source);
    if (encryptedSecretsUrls.length > 0) req.addSecretsReference(encryptedSecretsUrls);
    else if (donHostedSecretsVersion > 0) {
      req.addDONHostedSecrets(donHostedSecretsSlotID, donHostedSecretsVersion);
    }
    if (args.length > 0) req.setArgs(args);
    if (bytesArgs.length > 0) req.setBytesArgs(bytesArgs);
    s_lastRequestId = _sendRequest(req.encodeCBOR(), subscriptionId, gasLimit, donID);
    return s_lastRequestId;
  }

  /**
   * @notice Send a pre-encoded CBOR request
   * @param request CBOR-encoded request data
   * @param subscriptionId Billing ID
   * @param gasLimit The maximum amount of gas the request can consume
   * @param donID ID of the job to be invoked
   * @return requestId The ID of the sent request
   */
  function sendRequestCBOR(
    bytes memory request,
    uint64 subscriptionId,
    uint32 gasLimit,
    bytes32 donID
  ) external onlyOwner returns (bytes32 requestId) {
    s_lastRequestId = _sendRequest(request, subscriptionId, gasLimit, donID);
    return s_lastRequestId;
  }

  /**
   * @notice Store latest result/error
   * @param requestId The request ID, returned by sendRequest()
   * @param response Aggregated response from the user code
   * @param err Aggregated error from the user code or from the execution pipeline
   * Either response or error parameter will be set, but never both
   */
  function fulfillRequest(bytes32 requestId, bytes memory response, bytes memory err) internal override {
    if (s_lastRequestId != requestId) {
      revert UnexpectedRequestID(requestId);
    }
    s_lastResponse = response;
    s_lastError = err;
    emit Response(requestId, s_lastResponse, s_lastError);
  }

  function _mintCredentials(address _account) internal {
    require(!accountMinted[_account], "already minted");
    _mint(_account, tokenId);
    accountMinted[_account] = true;
    tokenId++;
  }
}