private void fill(IEnumerable <PlaylistTrack> playlistTracks)
{
foreach (var playlistTrack in playlistTracks.OrderBy(pt => pt.TrackNo))
{
var playinglistItem = new PlayinglistItemPlaylistTrack(playlistTrack);
toPlayTracks.Add(playinglistItem);
_ = new PlayinglistTrack(playlistTrack.Key);
}
}
/// <summary>
/// Searches playinglistTrack in toPlayTracks and removes it.
/// </summary>
public void Remove(PlayinglistTrack playinglistTrack)
{
var playlistTrack = playinglistTrack.PlaylistTrack;
for (int toPlayTracksIndex = 0; toPlayTracksIndex < toPlayTracks.Count; toPlayTracksIndex++)
{
var playinglistItem = toPlayTracks[toPlayTracksIndex];
if (playinglistItem is PlayinglistItemPlaylistTrack playinglistItemPlaylistTrack)
{
if (playinglistItemPlaylistTrack.PlaylistTrack == playlistTrack)
{
toPlayTracks.RemoveAt(toPlayTracksIndex);
return;
}
}
}
}
public Track?GetNext(Random?random)
{
Track?next = null;
if (toPlayTracks.Count > 0)
{
var trackIndex = random?.Next(toPlayTracks.Count) ?? 0;
var playinglistItem = toPlayTracks[trackIndex];
toPlayTracks.RemoveAt(trackIndex);
if (playinglistItem is PlayinglistItemTrack playinglistItemTrack)
{
next = playinglistItemTrack.Track;
}
else if (playinglistItem is PlayinglistItemPlaylistTrack playinglistItemPlaylistTrack)
{
if (DC.Data.PlayinglistTracksByPlaylistTrackKey.TryGetValue(playinglistItemPlaylistTrack.PlaylistTrack.Key, out var playinglistTrack))
{
playinglistTrack.Release();
next = playinglistItemPlaylistTrack.PlaylistTrack.Track;
}
else
{
//PlayinglistTrack not found, Track might just have been removed from Playlist
//search for next existing playinglistItem
while (toPlayTracks.Count > 0)
{
if (trackIndex >= toPlayTracks.Count)
{
trackIndex = 0;
}
playinglistItem = toPlayTracks[trackIndex];
toPlayTracks.RemoveAt(trackIndex);
if (DC.Data.PlayinglistTracksByPlaylistTrackKey.TryGetValue(playinglistItemPlaylistTrack.PlaylistTrack.Key, out playinglistTrack))
{
playinglistTrack.Release();
return(playinglistItemPlaylistTrack.PlaylistTrack.Track);
}
}
System.Diagnostics.Debugger.Break();
return(null);
}
}
else
{
throw new NotSupportedException();
}
}
if (toPlayTracks.Count == 0)
{
if (Playlist is null)
{
if (allTracks.Count == 0)
{
System.Diagnostics.Debugger.Break();
return(null);
}
foreach (var copyTrack in allTracks)
{
toPlayTracks.Add(copyTrack);
if (copyTrack is PlayinglistItemPlaylistTrack playinglistItemPlaylistTrack)
{
System.Diagnostics.Debugger.Break();//We should never come here, because PlayinglistItemPlaylistTrack are not used when Playlist is null
//todo: change allTracks to List<PlayinglistItemTrack>
_ = new PlayinglistTrack(playinglistItemPlaylistTrack.PlaylistTrack.Key);
}
}
}
else
{
fill(Playlist.PlaylistTracks);
if (toPlayTracks.Count == 0)
{
//it seems user has deleted all tracks from playlist
return(null);
}
}
}
if (next is null)
{
//toPlayTracks was empty when GetNext() was called. Now toPlayTracks is supposed to be full, unless user deleted
//all tracks which were in the playlist in the meantime
System.Diagnostics.Debugger.Break();
return(null);
}
return(next);
}
