const path = require('path');
//const ping = require('heroku-self-ping').default(`${process.env.HEROKU_URL}/ping`);
const express = require('express');
const packageInfo = require('./package.json');

var app = express();
app.use(express.static(path.join(__dirname, 'public')));
app.set('view engine', 'ejs');

var server = app.listen(process.env.PORT, function () {
	console.log(`Обработка страниц в браузере запущена. Порт ${process.env.PORT}`);
	setTimeout(ping, 1000);
});

app.get('/', function (req, res) {
  res.json({ version: packageInfo.version });
});



/******************--- saveNewUsers ----**************************/
const { Client } = require('pg');
const client = new Client({
  connectionString: process.env.DATABASE_URL,
  ssl: {
    rejectUnauthorized: false
  }
})
client.connect();

var queue = new Map();
saveNewUsers();

function saveNewUsers(){
	(async () => {
		var user = queue.entries().next().value;
		while (user){
			var add_user = `INSERT INTO USERS(ID, REFRESH_TOKEN) VALUES(${user[0]}, '${user[1]}') ON CONFLICT (ID) DO UPDATE SET REFRESH_TOKEN = EXCLUDED.REFRESH_TOKEN;`;
			await client.query(add_user);
			queue.delete(user[0]);
			user = queue.entries().next().value;
		}
		setTimeout(saveNewUsers, 1000);
	})()
	.catch(e => {
		console.error(e);
	});
}
/******************--- saveNewUsers ----**************************/


/******************--- callback ----**************************/
var SpotifyWebApi = require('spotify-web-api-node');
var spotifyClientId = process.env.SPOTIFY_CLIENT_ID;
var spotifyClientSecret = process.env.SPOTIFY_CLIENT_SECRET;
var spotifyRedirectUri = process.env.SPOTIFY_REDIRECT_URI;

app.get('/callback', (req, res) => {
  const error = req.query.error;
  const code = req.query.code;
  const state = req.query.state;
	
  if (error) {
    console.error('Ошибка на странице авторизации:', error);
    res.send(`Ошибка авторизации`);
    return;
  }

	var temp_spotifyApi = new SpotifyWebApi({
	  clientId: spotifyClientId,
	  clientSecret: spotifyClientSecret,
	  redirectUri: spotifyRedirectUri
	});
	var id = parseInt(state);
	
	temp_spotifyApi
	.authorizationCodeGrant(code)
	.then(data => {
		const refresh_token = data.body['refresh_token'];
		queue.set(id,refresh_token);
		console.log(`Прошла авторизация пользователя (id = ${id}, refreshToken = '${refresh_token}')`);
		res.redirect('/auth_completed');
	})
	.catch(error => {
		console.error('Error getting Tokens:', error);
		res.send(`Ошибка авторизации: ${error}`);
	})
	
});

app.get('/callback_admin', (req, res) => {
  const error = req.query.error;
  const code = req.query.code;
  const state = req.query.state;
	
  if (error) {
    console.error('Ошибка на странице авторизации:', error);
    res.send(`Ошибка авторизации`);
    return;
  }
	var options = JSON.parse(decodeURI(state));
	var temp_spotifyApi = new SpotifyWebApi(options);

	
	temp_spotifyApi
	.authorizationCodeGrant(code)
	.then(data => {
		const refresh_token = data.body['refresh_token'];
		console.log(`Прошла авторизация пользователя (refreshToken = '${refresh_token}')`);
		res.send(refresh_token);
	})
	.catch(error => {
		console.error('Error getting Tokens:', error);
		res.send(`Ошибка авторизации: ${error}`);
	})
	
});
/******************--- callback ----**************************/



/******************--- auth_completed ----**************************/
app.get('/auth_completed', (req, res) => {
	res.render('pages/auth_completed');
});
/******************--- auth_completed ----**************************/


/******************--- Pinging ----**************************/
app.get('/ping', function(req, res, next) {
    res.status(200).send("pong");
});

const https = require('https')
const options = {
  hostname: 'myspotifytransfer.herokuapp.com',
  path: '/ping',
  method: 'GET'
}
function ping(){
	const req = https.request(options, res => {
		console.log(`Server ping - statusCode: ${res.statusCode}`)
	}).end()
	setTimeout(ping, 1200000);
}
/******************--- Pinging ----**************************/