public override async Task ProcessInternal(long id, DirectoryInfo workDir, CancellationToken token, ILog log)
{
var vkPlaylists = await vkApiUtils.GetAllPagesAsync(vkApiUtils.Playlists(id), 200, token, log);
log.Debug($"Audio: {vkPlaylists.Count} playlists");
var expandTasks = vkPlaylists.Select(p => vkApiUtils.ExpandPlaylist(p, token, log));
var playlists = await Task.WhenAll(expandTasks);
log.Debug($"Audio: {playlists.Sum(p => p.Audio.Count)} in {playlists.Length} playlists");
var allAudios = await vkApiUtils.GetAllPagesAsync(vkApiUtils.Audios(id), long.MaxValue, token, log);
var audioInPlaylists = playlists
.SelectMany(p => p.Audio.Select(t => t.Id))
.ToHashSet();
var uniqueAudios = allAudios
.Where(a => !audioInPlaylists.Contains(a.Id.Value))
.ToList();
var defaultPlaylist = new PlaylistWithAudio(uniqueAudios);
log.Debug($"Audio: {allAudios.Count} total, {defaultPlaylist.Audio.Count} unique in default playlist");
var allPlaylists = playlists.ToList();
allPlaylists.Add(defaultPlaylist);
var allTasks = allPlaylists
.OrderBy(p => p.Playlist.CreateTime)
.Select(p => playlistHandler.Process(p, workDir, token, log));
await Task.WhenAll(allTasks);
}