var SpotifyWebApi = require('spotify-web-api-node');
var YandexMusicApi = require('yandex-music-api');
var yandexApi = new YandexMusicApi();
var spotifyApi = new SpotifyWebApi({
    clientId: "CLIENTID",
    clientSecret: "CLIENTSECRET"
});
var getMatchingSong = function(track) {
    var options = { type: "track" };
    var title = track.track.artists[0].name + ' ' + track.track.name;
    return yandexApi.search(title, options).then(function(result) {
        console.log(result);
        console.log('\nSearch result for tracks: "' + title + '" (page: ' + result.page + ', per page: ' + result.perPage + '):');
        if (result.tracks !== undefined) {
            return result.tracks.results[0];
        }
    });
};
spotifyApi.clientCredentialsGrant()
  .then(function(data) {
    console.log('The access token expires in ' + data.body['expires_in']);
    console.log('The access token is ' + data.body['access_token']);

    // Save the access token so that it's used in future calls
    spotifyApi.setAccessToken(data.body['access_token']);
  }, function(err) {
        console.log('Something went wrong when retrieving an access token', err);
  })
  .then(function() {
      return spotifyApi.getPlaylist('spotify', '6G2GPOJNY3ZmXHdbL2jAee')
        .then(function(data) {
          return data;
        }, function(err) {
          console.error(err);
        });
  })
  .then(function(data) {
      return yandexApi.init({username: 'EMAIL', password: 'PASSWORD'}).then(function() {
          console.log("Initiated")
          return yandexApi.createPlaylist(data["body"]["name"], {'visibility': 'public'}).then(function(playlist) {

          console.log('New playlist has been created:')
          console.log('Name: ' + playlist.title);
          console.log('Kind: ' + playlist.kind);
          console.log('Visibility: ' + playlist.visibility);

          return [data, playlist];
      })
    })
}).then(function(data){
    let spotifyData = data[0];
    let playlist = data[1];
    var actions = spotifyData.body.tracks.items.map(getMatchingSong); // run the function over all items.

    var results = Promise.all(actions); // pass array of promises

    return results.then(function(result) {
        console.log(result);
        var tracks = [];
        result.forEach(function(el) {
            if (el !== undefined) {
                tracks.push({id: el.id, albumId: el.albums[0].id})
            }
        })
        // { id:'20599729', albumId:'2347459' },
        // { id:'20069589', albumId:'2265364' },
        // { id:'15924630', albumId:'1795812' },
        // ]
        //
        return yandexApi.addTracksToPlaylist(playlist.kind, tracks, playlist.revision).then(function(playlist) {

            console.log('Added ' + playlist.trackCount + ' tracks to the playlist:');

            return playlist;
            });
    });

}).catch(function(e) {
    console.log(e);
})