import { Router } from "express";
import type { Request } from "express";
import { graphqlClient } from "../lib/graphqlClient";
import { respondWithError } from "../lib/error";
import {
  GetAuthorDocument,
  AuthorsDocument,
  CreateAuthorDocument,
  type AuthorsQuery,
  type GetAuthorQuery,
  type CreateAuthorMutation,
} from "../../shared/generated/graphql";

const router = Router();

// GET /api/authors
interface GqlRequest extends Request {
  gql?: typeof graphqlClient;
}

router.get("/", async (req: GqlRequest, res) => {
  try {
    const variables = {
      limit: req.query.limit ? Number(req.query.limit) : undefined,
      offset: req.query.offset ? Number(req.query.offset) : undefined,
      search: req.query.search as string | undefined,
      countryId: req.query.countryId as string | undefined,
    };
    const client = req.gql || graphqlClient;
    const { authors } = await client.request<AuthorsQuery>(
      AuthorsDocument,
      variables
    );
    res.json(authors);
  } catch (error) {
    respondWithError(res, error, "Failed to fetch authors");
  }
});

// GET /api/authors/:id (use id instead of slug to align with GraphQL schema)
router.get("/:id", async (req: GqlRequest, res) => {
  try {
    const client = req.gql || graphqlClient;
    const { author } = await client.request<GetAuthorQuery>(
      GetAuthorDocument,
      {
        id: req.params.id,
      }
    );
    if (!author) return res.status(404).json({ message: "Author not found" });
    res.json(author);
  } catch (error) {
    respondWithError(res, error, "Failed to fetch author");
  }
});

// POST /api/authors
router.post("/", async (req: GqlRequest, res) => {
  try {
    const client = req.gql || graphqlClient;
    const { createAuthor } = await client.request<CreateAuthorMutation>(
      CreateAuthorDocument,
      {
        input: req.body,
      }
    );
    res.status(201).json(createAuthor);
  } catch (error) {
    respondWithError(res, error, "Failed to create author");
  }
});

export default router;