import { fetchFacebookItems } from "@marketplace-scrapers/core";

/**
 * GET /api/facebook?q={query}&location={location}
 * Search Facebook Marketplace for listings
 */
export async function facebookRoute(req: Request): Promise<Response> {
  const reqUrl = new URL(req.url);

  const SEARCH_QUERY =
    req.headers.get("query") || reqUrl.searchParams.get("q") || null;
  if (!SEARCH_QUERY)
    return Response.json(
      {
        message: "Request didn't have 'query' header or 'q' search parameter!",
      },
      { status: 400 },
    );

  const LOCATION = reqUrl.searchParams.get("location") || "toronto";
  const maxItemsParam = reqUrl.searchParams.get("maxItems");
  const maxItems = maxItemsParam ? parseInt(maxItemsParam, 10) : 25;
  if (maxItemsParam && Number.isNaN(maxItems)) {
    return Response.json(
      { message: "Invalid maxItems parameter" },
      { status: 400 },
    );
  }
  const hideUnstableResults =
    reqUrl.searchParams.get("unstableFilter") === "true";

  try {
    const items = await fetchFacebookItems(
      SEARCH_QUERY,
      1,
      LOCATION,
      maxItems,
      ...(hideUnstableResults ? [{ hideUnstableResults: true }] : []),
    );

    const isEmpty = hideUnstableResults
      ? items.results.length === 0 && items.unstableResults.length === 0
      : !items || items.length === 0;

    if (isEmpty)
      return Response.json(
        { message: "Search didn't return any results!" },
        { status: 404 },
      );
    return Response.json(items, { status: 200 });
  } catch (error) {
    console.error("Facebook scraping error:", error);
    const errorMessage =
      error instanceof Error ? error.message : "Unknown error occurred";
    return Response.json({ message: errorMessage }, { status: 400 });
  }
}