const SpotifyWebApi = require('spotify-web-api-node');
const ReadLine = require('readline');
const fs = require('fs').promises;
const path = require('path');

// Create the authorization URL
const rl = ReadLine.createInterface({
  input: process.stdin,
  output: process.stdout,
});

const root = path.join(__dirname, '..');

/*
{
  "clientId": "",
  "clientSecret": "",
  "redirectUri": "https://lunasqu.ee/callback"
}
*/
const spotifyApi = new SpotifyWebApi(require(path.join(root, 'credentials.json')));

function ask(msg) {
  return new Promise((resolve) => rl.question(msg, resolve));
}

async function setupSpotify() {
  let credentials = {
    token: null,
    expires: null,
    refresh: null,
  };

  try {
    credentials = JSON.parse(await fs.readFile(path.join(root, '.token.json')));
  } catch (e) {}

  if (!credentials.token) {
    const authorizeURL = spotifyApi.createAuthorizeURL(['playlist-modify-private'], 'FPEPFERHR234234trGEWErjrjsdw3666sf06');
    console.log('Authorize the application');
    console.log(authorizeURL);
    const code = await ask('Enter code []> ');

    if (!code) {
      process.exit(1);
    }

    const data = await spotifyApi.authorizationCodeGrant(code);
    console.log('The access token has been received.');

    // Set the access token on the API object to use it in later calls
    spotifyApi.setAccessToken(data.body['access_token']);
    spotifyApi.setRefreshToken(data.body['refresh_token']);

    credentials.token = data.body['access_token'];
    credentials.expires = Math.floor(Date.now() / 1000) + data.body['expires_in'];
    credentials.refresh = data.body['refresh_token'];

    await fs.writeFile(path.join(root, '.token.json'), JSON.stringify(credentials, undefined, 2));
  } else {
    console.log('The access token is present');
    spotifyApi.setAccessToken(credentials.token);
    spotifyApi.setRefreshToken(credentials.refresh);
  }

  if ((credentials.expires * 1000) < Date.now()) {
    console.log('Refreshing access token');
    try {
      const refresh = await spotifyApi.refreshAccessToken();
      credentials.token = refresh.body['access_token'];
      credentials.expires = Math.floor(Date.now() / 1000) + refresh.body['expires_in'];
      spotifyApi.setAccessToken(credentials.token);
      spotifyApi.setRefreshToken(credentials.refresh);
    } catch (e) {
      console.error(e);
      console.log('need to reauthorize');
      credentials.token = null;
    }
    await fs.writeFile(path.join(root, '.token.json'), JSON.stringify(credentials, undefined, 2));
    if (!credentials.token) {
      return setupSpotify();
    }
  }

  console.log('the token is good until', new Date(credentials.expires * 1000).toString());
  rl.close();
  return spotifyApi;
}

module.exports = {
  setupSpotify,
  spotifyApi,
};