/// <summary>
/// Synchronizes the new songs.
/// </summary>
/// <param name="onlineSongs">
/// The online songs.
/// </param>
/// <returns>
/// Task.
/// </returns>
private async Task PullSyncNewSongsAsync(List <CloudSong> onlineSongs)
{
var collectionSongs = _collectionService.Songs.Where(p => p.SongState != SongState.Local &&
!p.IsTemp).ToList();
// nothing different
if (onlineSongs.Count - collectionSongs.Count == 0)
{
return;
}
// Wrap everything in one transaction
_sqlService.BeginTransaction();
// when syncing over 20 new songs is best to supress the collection (avoiding unnecessary ui work)
var reset = (onlineSongs.Count - collectionSongs.Count) > 20;
if (reset)
{
await _dispatcherHelper.RunAsync(
() =>
{
if (OnLargeSyncStarted != null)
{
OnLargeSyncStarted(null, EventArgs.Empty);
}
_collectionService.Songs.SuppressEvents = true;
_collectionService.Artists.SuppressEvents = true;
_collectionService.Albums.SuppressEvents = true;
});
}
foreach (var onlineSong in from onlineSong in onlineSongs
let localSong = collectionSongs.FirstOrDefault(p => p.CloudId == onlineSong.Id)
where localSong == null
select onlineSong)
{
if (LastSyncTime > onlineSong.CreatedAt)
{
await _mobileServiceClient.GetTable <CloudSong>().DeleteAsync(onlineSong).ConfigureAwait(false);
continue;
}
// Cloud song is not in the collection, check if it was saved before syncing
var collSong = collectionSongs.FirstOrDefault(p => p.ProviderId == onlineSong.ProviderId);
if (collSong != null)
{
collSong.CloudId = onlineSong.Id;
await _sqlService.UpdateItemAsync(collSong).ConfigureAwait(false);
}
else
{
if (onlineSong.Album == null | onlineSong.Artist == null)
{
await _mobileServiceClient.GetTable <CloudSong>().DeleteAsync(onlineSong).ConfigureAwait(false);
continue;
}
if (onlineSong.Album.PrimaryArtist == null)
{
onlineSong.Album.PrimaryArtist = onlineSong.Artist;
}
// Can't change CloudSong to Song, so need to create a new song
var newSong = new Song(onlineSong)
{
Album = new Album(onlineSong.Album),
Artist = new Artist(onlineSong.Artist)
};
// By setting it to just synced, the app knows it has to match an audio url to it
await _collectionService.AddSongAsync(newSong).ConfigureAwait(false);
}
}
// commit the transaction
_sqlService.Commit();
if (reset)
{
await _dispatcherHelper.RunAsync(
() =>
{
if (OnLargeSyncFinished != null)
{
OnLargeSyncFinished(null, EventArgs.Empty);
}
_collectionService.Songs.Reset();
_collectionService.Albums.Reset();
_collectionService.Artists.Reset();
});
}
}