import { Response } from "express";
import { v4 as uuidv4 } from "uuid";
import {
  CrawlRequest,
  crawlRequestSchema,
  CrawlResponse,
  legacyCrawlerOptions,
  legacyScrapeOptions,
  RequestWithAuth,
} from "./types";
import {
  addCrawlJob,
  addCrawlJobs,
  crawlToCrawler,
  lockURL,
  lockURLs,
  saveCrawl,
  StoredCrawl,
} from "../../lib/crawl-redis";
import { logCrawl } from "../../services/logging/crawl_log";
import { getScrapeQueue } from "../../services/queue-service";
import { addScrapeJob } from "../../services/queue-jobs";
import { Logger } from "../../lib/logger";

export async function crawlController(
  req: RequestWithAuth<{}, CrawlResponse, CrawlRequest>,
  res: Response<CrawlResponse>
) {
  req.body = crawlRequestSchema.parse(req.body);

  const id = uuidv4();

  await logCrawl(id, req.auth.team_id);

  const { remainingCredits } = req.account;

  // TODO: Get rid of crawlerOptions
  const crawlerOptions = legacyCrawlerOptions(req.body.crawlerOptions);
  const pageOptions = legacyScrapeOptions(req.body.scrapeOptions);

  crawlerOptions.limit = Math.min(remainingCredits, crawlerOptions.limit);
  
  const sc: StoredCrawl = {
    originUrl: req.body.url,
    crawlerOptions,
    pageOptions,
    team_id: req.auth.team_id,
    createdAt: Date.now(),
  };

  const crawler = crawlToCrawler(id, sc);

  try {
    sc.robots = await crawler.getRobotsTxt();
  } catch (e) {
    Logger.debug(
      `[Crawl] Failed to get robots.txt (this is probably fine!): ${JSON.stringify(
        e
      )}`
    );
  }

  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",
          team_id: req.auth.team_id,
          crawlerOptions,
          pageOptions,
          origin: "api",
          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, req.body.url);
    const job = await addScrapeJob(
      {
        url: req.body.url,
        mode: "single_urls",
        crawlerOptions: crawlerOptions,
        team_id: req.auth.team_id,
        pageOptions: pageOptions,
        origin: "api",
        crawl_id: id,
        webhook: req.body.webhook,
      },
      {
        priority: 15,
      }
    );
    await addCrawlJob(id, job.id);
  }

  return res.status(200).json({
    success: true,
    id,
    url: `${req.protocol}://${req.get("host")}/v1/crawl/${id}`,
  });
}