const { Types } = require('mongoose');
const puppeteer = require('puppeteer');
const Bluebird = require('bluebird');
const UserModel = require('../services/users/user.model.js');
const launchUserSession = require('./launchUserSession.js');
const attendConference = require('./attendConference.js');
const { clickElementBySelector } = require('./utils.js');

const { EDUFPMI_URL, NODE_ENV, HEADFUL } = process.env;

// Always run headless in production, but allow configuring for development
const headless = NODE_ENV === 'production' || !HEADFUL;


const handleEventAsUser = async (event, browser, user) => {
  console.log(`Running event as ${user.username}`);

  const browserContext = await browser.createIncognitoBrowserContext();

  const { conferenceId } = event;
  const conferenceUrl = `${EDUFPMI_URL}/mod/bigbluebuttonbn/view.php?id=${conferenceId}`;

  const page = await launchUserSession(user, browserContext);
  await page.goto(conferenceUrl);

  // Launch the conference in a new tab
  const conferencePagePromise = new Promise(resolve => browserContext.on(
    'targetcreated',
    target => resolve(target.page())
  ));
  await clickElementBySelector(page, 'input#join_button_input');
  const conferencePage = await conferencePagePromise;
  await page.close();

  await attendConference(conferencePage, () => console.log(`Joined the conference at ${conferenceUrl}`));

  await browserContext.close();
};

const handleEvent = async event => {
  const participants = await UserModel.find({
    username: {
      $in: event.participants
    }
  });

  console.log('Participants: ', participants.map(participant => participant.username));

  const browser = await puppeteer.launch({ headless, args: ['--no-sandbox', '--incognito'] });

  try {
    await Bluebird.map(participants, participant => handleEventAsUser(event, browser, participant));
  } finally {
    await browser.close();
  }
};


module.exports = handleEvent;