/**
 * This example is using the Authorization Code flow.
 *
 * In root directory run
 *
 *     npm install express
 *
 * then run with the followinng command. If you don't have a client_id and client_secret yet,
 * create an application on Create an application here: https://developer.spotify.com/my-applications to get them.
 * Make sure you whitelist the correct redirectUri in line 26.
 *
 *     node access-token-server.js "<Client ID>" "<Client Secret>"
 *
 *  and visit <http://localhost:8888/login> in your Browser.
 */
const SpotifyWebApi = require('../../')
const express = require('../../node_modules/express')

const scopes = [
  'ugc-image-upload',
  'user-read-playback-state',
  'user-modify-playback-state',
  'user-read-currently-playing',
  'streaming',
  'app-remote-control',
  'user-read-email',
  'user-read-private',
  'playlist-read-collaborative',
  'playlist-modify-public',
  'playlist-read-private',
  'playlist-modify-private',
  'user-library-modify',
  'user-library-read',
  'user-top-read',
  'user-read-playback-position',
  'user-read-recently-played',
  'user-follow-read',
  'user-follow-modify'
]

const spotifyApi = new SpotifyWebApi({
  redirectUri: 'http://localhost:8888/callback',
  clientId: process.argv.slice(2)[0],
  clientSecret: process.argv.slice(2)[1]
})

const app = express()

app.get('/login', (req, res) => {
  res.redirect(spotifyApi.createAuthorizeURL(scopes))
})

app.get('/callback', (req, res) => {
  const error = req.query.error
  const code = req.query.code
  const state = req.query.state

  if (error) {
    console.error('Callback Error:', error)
    res.send(`Callback Error: ${error}`)
    return
  }

  spotifyApi
    .authorizationCodeGrant(code)
    .then(data => {
      const access_token = data.body.access_token
      const refresh_token = data.body.refresh_token
      const expires_in = data.body.expires_in

      spotifyApi.setAccessToken(access_token)
      spotifyApi.setRefreshToken(refresh_token)

      console.log('access_token:', access_token)
      console.log('refresh_token:', refresh_token)

      console.log(
        `Sucessfully retreived access token. Expires in ${expires_in} s.`
      )
      res.send('Success! You can now close the window.')

      setInterval(async () => {
        const data = await spotifyApi.refreshAccessToken()
        const access_token = data.body.access_token

        console.log('The access token has been refreshed!')
        console.log('access_token:', access_token)
        spotifyApi.setAccessToken(access_token)
      }, expires_in / 2 * 1000)
    })
    .catch(error => {
      console.error('Error getting Tokens:', error)
      res.send(`Error getting Tokens: ${error}`)
    })
})

app.listen(8888, () =>
  console.log(
    'HTTP Server up. Now go to http://localhost:8888/login in your browser.'
  )
)