import { Request, Response } from "express";
import { checkTeamCredits } from "../../src/services/billing/credit_billing";
import { authenticateUser } from "./auth";
import { RateLimiterMode } from "../../src/types";
import { addScrapeJob } from "../../src/services/queue-jobs";
import { isUrlBlocked } from "../../src/scraper/WebScraper/utils/blocklist";
import { logCrawl } from "../../src/services/logging/crawl_log";
import { validateIdempotencyKey } from "../../src/services/idempotency/validate";
import { createIdempotencyKey } from "../../src/services/idempotency/create";
import { defaultCrawlPageOptions, defaultCrawlerOptions, defaultOrigin } from "../../src/lib/default-values";
import { v4 as uuidv4 } from "uuid";
import { Logger } from "../../src/lib/logger";
import { addCrawlJob, addCrawlJobs, crawlToCrawler, lockURL, lockURLs, saveCrawl, StoredCrawl } from "../../src/lib/crawl-redis";
import { getScrapeQueue } from "../../src/services/queue-service";
import { checkAndUpdateURL } from "../../src/lib/validateUrl";

export async function crawlController(req: Request, res: Response) {
  try {
    const { success, team_id, error, status } = await authenticateUser(
      req,
      res,
      RateLimiterMode.Crawl
    );
    if (!success) {
      return res.status(status).json({ error });
    }

    if (req.headers["x-idempotency-key"]) {
      const isIdempotencyValid = await validateIdempotencyKey(req);
      if (!isIdempotencyValid) {
        return res.status(409).json({ error: "Idempotency key already used" });
      }
      try {
        createIdempotencyKey(req);
      } catch (error) {
        Logger.error(error);
        return res.status(500).json({ error: error.message });
      }
    }

    const { success: creditsCheckSuccess, message: creditsCheckMessage } =
      await checkTeamCredits(team_id, 1);
    if (!creditsCheckSuccess) {
      return res.status(402).json({ error: "Insufficient credits" });
    }

    let url = req.body.url;
    if (!url) {
      return res.status(400).json({ error: "Url is required" });
    }
    try {
      url = checkAndUpdateURL(url).url;
    } catch (e) {
      return res
        .status(e instanceof Error && e.message === "Invalid URL" ? 400 : 500)
        .json({ error: e.message ?? e });
    }

    if (isUrlBlocked(url)) {
      return res
        .status(403)
        .json({
          error:
            "Firecrawl currently does not support social media scraping due to policy restrictions. We're actively working on building support for it.",
        });
    }

    const mode = req.body.mode ?? "crawl";

    const crawlerOptions = { ...defaultCrawlerOptions, ...req.body.crawlerOptions };
    const pageOptions = { ...defaultCrawlPageOptions, ...req.body.pageOptions };

    // if (mode === "single_urls" && !url.includes(",")) { // NOTE: do we need this?
    //   try {
    //     const a = new WebScraperDataProvider();
    //     await a.setOptions({
    //       jobId: uuidv4(),
    //       mode: "single_urls",
    //       urls: [url],
    //       crawlerOptions: { ...crawlerOptions, returnOnlyUrls: true },
    //       pageOptions: pageOptions,
    //     });

    //     const docs = await a.getDocuments(false, (progress) => {
    //       job.updateProgress({
    //         current: progress.current,
    //         total: progress.total,
    //         current_step: "SCRAPING",
    //         current_url: progress.currentDocumentUrl,
    //       });
    //     });
    //     return res.json({
    //       success: true,
    //       documents: docs,
    //     });
    //   } catch (error) {
    //     Logger.error(error);
    //     return res.status(500).json({ error: error.message });
    //   }
    // }

    const id = uuidv4();

    await logCrawl(id, team_id);

    const sc: StoredCrawl = {
      originUrl: url,
      crawlerOptions,
      pageOptions,
      team_id,
      createdAt: Date.now(),
    };

    const crawler = crawlToCrawler(id, sc);

    try {
      sc.robots = await crawler.getRobotsTxt();
    } catch (_) {}

    await saveCrawl(id, sc);

    const sitemap = sc.crawlerOptions?.ignoreSitemap ? null : await crawler.tryGetSitemap();

    if (sitemap !== null) {
      const jobs = sitemap.map(x => {
        const url = x.url;
        const uuid = uuidv4();
        return {
          name: uuid,
          data: {
            url,
            mode: "single_urls",
            crawlerOptions: crawlerOptions,
            team_id: team_id,
            pageOptions: pageOptions,
            origin: req.body.origin ?? defaultOrigin,
            crawl_id: id,
            sitemapped: true,
          },
          opts: {
            jobId: uuid,
            priority: 20,
          }
        };
      })

      await lockURLs(id, jobs.map(x => x.data.url));
      await addCrawlJobs(id, jobs.map(x => x.opts.jobId));
      await getScrapeQueue().addBulk(jobs);
    } else {
      await lockURL(id, sc, url);
      const job = await addScrapeJob({
        url,
        mode: "single_urls",
        crawlerOptions: crawlerOptions,
        team_id: team_id,
        pageOptions: pageOptions,
        origin: req.body.origin ?? defaultOrigin,
        crawl_id: id,
      }, {
        priority: 15, // prioritize request 0 of crawl jobs same as scrape jobs
      });
      await addCrawlJob(id, job.id);
    }

    res.json({ jobId: id });
  } catch (error) {
    Logger.error(error);
    return res.status(500).json({ error: error.message });
  }
}