index.js

var request = require('request');
var cheerio = require('cheerio');
var nodemailer = require('nodemailer');
var fs = require('fs');
var http = require('http');

require('dotenv').config();

// Setting Timer for 5 minutes

let timer = 1000;

// Setting Initial Values of theatres that I already Know for locations (Since this is only for small purpose. Don't expect too much for me. Okay?)

let bangalore = 3;
let hyderabad = 3;

// Handle Bangalore Requests

function sendBangaloreMail() {
  if (process.env.BANGALORE_RECIPIENTS) {
    var transporter = nodemailer.createTransport({
      service: 'gmail',
      auth: {
        user: process.env.EMAIL,
        pass: process.env.PASSWORD
      }
    });

    const mailOptions = {
      from: process.env.EMAIL,
      to: process.env.BANGALORE_RECIPIENTS,
      subject: 'Avengers is here.',
      html:
        '<p>Hey! This is a reminder that new theatre has started screening Avengers: End Game</p>'
    };

    return transporter.sendMail(mailOptions, (err, info) => {
      if (err) {
        console.log(err);
      } else {
        console.log(info);
      }
    });
  } else {
    return;
  }
}

async function doBangaloreStuff() {
  console.log('Doing Bangalore...');
  clearInterval(timer);

  setInterval(async () => {
    console.log('Making the request');
    await request(
      'https://in.bookmyshow.com/buytickets/avengers-endgame-bengaluru/movie-bang-ET00100674-MT/20190426',
      (error, response, html) => {
        if (!error & (response.statusCode == 200)) {
          var $ = cheerio.load(html);
          if ($('#venuelist').children('.list').length > bangalore) {
            bangalore++;
            return sendBangaloreMail();
          }
        }
      }
    );
  }, timer);

  return true;
}

// Handle Hyderabad Requests

function sendHyderabadMail() {
  if (process.env.HYDERABAD_RECIPIENTS) {
    var transporter = nodemailer.createTransport({
      service: 'gmail',
      auth: {
        user: process.env.EMAIL,
        pass: process.env.PASSWORD
      }
    });

    const mailOptions = {
      from: 'reeversedev@gmail.com',
      to: process.env.HYDERABAD_RECIPIENTS,
      subject: 'Avengers is here.',
      html:
        '<p>Hey! This is a reminder that new theatre has started screening <a href="https://in.bookmyshow.com/buytickets/pvr-forum-sujana-mall-kukatpally-hyderabad/cinema-hyd-PVSF-MT/20190426">Avengers: End Game</a></p>'
    };

    return transporter.sendMail(mailOptions, (err, info) => {
      if (err) {
        console.log(err);
      } else {
        console.log(info);
      }
    });
  } else {
    return;
  }
}

async function doHyderabadStuff() {
  console.log('Doing Hyderabad...');
  clearInterval(timer);
  setInterval(async () => {
    console.log('Making the request');
    await request(
      'https://in.bookmyshow.com/buytickets/pvr-forum-sujana-mall-kukatpally-hyderabad/cinema-hyd-PVSF-MT/20190426',
      (error, response, html) => {
        if (!error & (response.statusCode == 200)) {
          var $ = cheerio.load(html);
          if ($('#venuelist').children('.list').length > hyderabad) {
            hyderabad++;
            return sendHyderabadMail();
          }
        }
      }
    );
  }, timer);

  return true;
}

http.createServer().listen(3000, () => {
  console.log('Server at PORT 3000 started.');
  doBangaloreStuff();
  doHyderabadStuff();
});