import { convertStrToTitle } from '@mintlify/common';
import type { Browser } from 'puppeteer';

import { OVERVIEW_PAGE_SLUG } from '../constants.js';
import type { Result } from '../types/result.js';
import { getErrorMessage } from '../utils/errors.js';
import { intoChunks } from '../utils/intoChunks.js';
import { log } from '../utils/log.js';
import { fetchPageHtml, startPuppeteer } from '../utils/network.js';
import { scrapePage } from './page.js';

export async function scrapePageGroup(
  navGroup: Array<URL>,
  needsBrowser: boolean,
  opts: {
    externalLinks: boolean;
    rootPaths?: Array<string>;
  } = { externalLinks: false }
): Promise<Array<Result<[string, string]>>> {
  const browser: Browser | undefined = needsBrowser ? await startPuppeteer() : undefined;

  const allResults: Array<Result<[string, string]>> = [];
  try {
    for (const chunk of intoChunks(navGroup)) {
      const res = await Promise.all(
        chunk.map(async (url, index) => {
          try {
            if (opts.externalLinks) {
              let externalLinkTitle =
                convertStrToTitle(url.pathname.split('/').at(-1) ?? url.pathname) ||
                `external-link-${index}`;
              externalLinkTitle = externalLinkTitle.replace(/\s+/g, '-').toLowerCase();
              const res = scrapePage(externalLinkTitle, url, { externalLink: true });
              return res;
            }

            let isOverviewPage = false;
            if (url.toString().endsWith(OVERVIEW_PAGE_SLUG)) {
              isOverviewPage = true;
              url = new URL(url.toString().replace(OVERVIEW_PAGE_SLUG, ''));
            }

            const html = await fetchPageHtml(url, browser);
            const res = scrapePage(html, url, {
              externalLink: false,
              isOverviewPage,
              rootPath: opts.rootPaths ? opts.rootPaths[index] : undefined,
            });
            return res;
          } catch (error) {
            const errorMessage = getErrorMessage(error);
            return {
              success: false,
              message: `We encountered an error when scraping ${url}${errorMessage}`,
              data: [url.toString(), ''] as [string, string],
            };
          }
        })
      );
      allResults.push(...res);
    }
  } catch (error) {
    const errorMessage = getErrorMessage(error);
    log(
      `We encountered an error when scraping the page group from ${
        navGroup[0]?.origin ?? 'the URL provided'
      }${errorMessage}`
    );
    if (browser) await browser.close();
    throw error;
  } finally {
    if (browser) await browser.close();
    return allResults;
  }
}