import { fetchKijijiItems } from "@marketplace-scrapers/core";
import { logger } from "../logger";
import {
  emptySearchResponse,
  getRequiredSearchQuery,
  parseDollarPriceParam,
  parseNonNegativeIntegerParam,
} from "./helpers";

/**
 * GET /api/kijiji?q={query}
 * Search Kijiji marketplace for listings
 */
export async function kijijiRoute(req: Request): Promise<Response> {
  const reqUrl = new URL(req.url);

  const SEARCH_QUERY = getRequiredSearchQuery(req);
  if (SEARCH_QUERY instanceof Response) {
    return SEARCH_QUERY;
  }

  const maxPages = parseNonNegativeIntegerParam(
    reqUrl.searchParams,
    "maxPages",
    5,
  );
  if (maxPages instanceof Response) {
    return maxPages;
  }
  const priceMin = parseDollarPriceParam(reqUrl.searchParams, "priceMin");
  if (priceMin instanceof Response) {
    return priceMin;
  }
  const priceMax = parseDollarPriceParam(reqUrl.searchParams, "priceMax");
  if (priceMax instanceof Response) {
    return priceMax;
  }
  const hideUnstableResults =
    reqUrl.searchParams.get("unstableFilter") === "true";

  const searchOptions = {
    location: reqUrl.searchParams.get("location") || undefined,
    category: reqUrl.searchParams.get("category") || undefined,
    keywords: reqUrl.searchParams.get("keywords") || undefined,
    sortBy:
      (reqUrl.searchParams.get("sortBy") as
        | "relevancy"
        | "date"
        | "price"
        | "distance"
        | undefined) || undefined,
    sortOrder:
      (reqUrl.searchParams.get("sortOrder") as "desc" | "asc" | undefined) ||
      undefined,
    maxPages,
    priceMin,
    priceMax,
  };

  try {
    if (hideUnstableResults) {
      const items = await fetchKijijiItems(
        SEARCH_QUERY,
        4, // 4 requests per second for faster scraping
        "https://www.kijiji.ca",
        searchOptions,
        {},
        { hideUnstableResults: true },
      );
      if (items.results.length === 0 && items.unstableResults.length === 0) {
        return emptySearchResponse(
          `Kijiji matches ALL words in the query against listing titles. ` +
            `Try a shorter or more common query (e.g. "macbook air m1" instead of "macbook air m1 apple silicon").`,
        );
      }
      return Response.json(items, { status: 200 });
    }

    const items = await fetchKijijiItems(
      SEARCH_QUERY,
      4, // 4 requests per second for faster scraping
      "https://www.kijiji.ca",
      searchOptions,
      {},
    );
    if (!items || items.length === 0) {
      return emptySearchResponse(
        `Kijiji matches ALL words in the query against listing titles. ` +
          `Try a shorter or more common query (e.g. "macbook air m1" instead of "macbook air m1 apple silicon").`,
      );
    }
    return Response.json(items, { status: 200 });
  } catch (error) {
    logger.error("Kijiji scraping error:", error);
    const errorMessage =
      error instanceof Error ? error.message : "Unknown error occurred";
    return Response.json({ message: errorMessage }, { status: 400 });
  }
}