require('dotenv').config();
const jsonToken = require('./token.json');
const Gmailpush = require('gmailpush');
const express = require('express');
const app = express();

// Initialize with OAuth2 config and Pub/Sub topic
const gmailpush = new Gmailpush({
  clientId: process.env.CLIENT_ID,
  clientSecret: process.env.CLIENT_SECRET,
  pubsubTopic: process.env.TOPIC_URL
});

const users = [
  {
    email: process.env.EMAIL,
    token: {
      access_token: jsonToken.access_token,
      refresh_token: jsonToken.refresh_token,
      scope: jsonToken.scope,
      token_type: jsonToken.token_type,
      expiry_date: jsonToken.expiry_date
    }
  }
];

app.post(
  // Use URL set as Pub/Sub Subscription endpoint
  '/pubsub',
  // Parse JSON request payload
  express.json(),
  (req, res) => {
    // Acknowledge Gmail push notification webhook
    res.sendStatus(200); // added .end()
    console.log('request', req.body); // added this
    // Get Email address contained in the push notification
    const email = gmailpush.getEmailAddress(req.body);
    console.log('email', email); //added this
    // Get access token for the Email address
    const token = users.find((user) => user.email === email).token;

    gmailpush
      .getMessages({
        notification: req.body,
        token,
        withLabelIds: ['UNREAD']
      })
      .then((messages) => {
        console.log('messages', messages);
         fs.readFile('./gmailpush_history.json')
          .then((result) => {
            const prevHistories = JSON.parse(result);
            const prevHistory = prevHistories.find((prevHistory) => prevHistory.emailAddress === email);
            schedule.scheduleJob(new Date(prevHistory.watchExpiration - 1000 * 60 * 30), async () => {
              prevHistory.watchExpiration = await gmailpush._refreshWatch();
              fs.writeFile('./gmailpush_history.json', JSON.stringify(prevHistories));
            });
          });
      })
      .catch((err) => {
        console.log(err);
      });
  }
);

app.listen(3002, () => {
  console.log('Server listening on port 3002...');
});

require('dotenv').config();
const readline = require('readline');
const {google} = require('googleapis');

function getToken() {
  const auth = new google.auth.OAuth2(
    process.env.CLIENT_ID,
    process.env.CLIENT_SECRET,
    'urn:ietf:wg:oauth:2.0:oob'
  );

  const authUrl = auth.generateAuthUrl({
    access_type: 'offline',
    scope: ['https://www.googleapis.com/auth/gmail.readonly'],
  });

  console.log('Authorize this app by visiting this url:');
  console.log(authUrl);

  const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
  });

  rl.question('Enter the code from that page here: ', (authCode) => {
    rl.close();
    auth.getToken(authCode, (err, token) => {
      if (err) {
        return console.log('Error retrieving access token', err);
      }

      console.log('Token:');
      console.log(token);
    });
  });
}

getToken();