/// <summary>
/// Delete the specified Albums from the storage and the collections
/// </summary>
/// <param name="albumToDelete"></param>
/// <returns></returns>
public static void DeleteAlbums(IEnumerable <Album> albumsToDelete)
{
// No need to wait for the delete
DbAccess.DeleteItemsAsync(albumsToDelete);
foreach (Album albumToDelete in albumsToDelete)
{
AlbumCollection.Remove(albumToDelete);
IdLookup.Remove(albumToDelete.Id);
}
}
/// <summary>
/// Delete the specified Artists from the storage and the collections
/// </summary>
/// <param name="artistsToDelete"></param>
public static void DeleteArtists(IEnumerable <Artist> artistsToDelete)
{
DbAccess.DeleteItemsAsync(artistsToDelete);
foreach (Artist artistToDelete in artistsToDelete)
{
ArtistCollection.Remove(artistToDelete);
IdLookup.Remove(artistToDelete.Id);
}
}
/// <summary>
/// Delete all the specified ArtistAlbum from the storage and the collections
/// </summary>
/// <param name="artistAlbumsToDelete"></param>
/// <returns></returns>
public static void DeleteArtistAlbums(IEnumerable <ArtistAlbum> artistAlbumsToDelete)
{
// No need to wait for the ArtistAlbums to be deleted from storage
DbAccess.DeleteItemsAsync(artistAlbumsToDelete);
foreach (ArtistAlbum artAlbum in artistAlbumsToDelete)
{
ArtistAlbumCollection.Remove(artAlbum);
IdLookup.Remove(artAlbum.Id);
}
}
/// <summary>
/// Get the Playlists collection from storage
/// </summary>
/// <returns></returns>
public static async Task GetDataAsync()
{
if (PlaylistCollection == null)
{
PlaylistCollection = new List <Playlist>();
// Get the current set of SongPlaylists
List <SongPlaylist> songPlaylists = await DbAccess.LoadAsync <SongPlaylist>();
// Get all the SongPlaylistItems
List <SongPlaylistItem> songPlaylistItems = await DbAccess.LoadAsync <SongPlaylistItem>();
// Make sure all these items are linked to songs. Remove any that aren't
List <SongPlaylistItem> orphanItems = songPlaylistItems.Where(item => Songs.GetSongById(item.SongId) == null).ToList();
// Remove any orphaned items
orphanItems.ForEach(item => songPlaylistItems.Remove(item));
DbAccess.DeleteItemsAsync(orphanItems);
// Link the playlists with their playlistitems
songPlaylists.ForEach(playlist => playlist.GetContents(songPlaylistItems));
// Add these to the main collection
PlaylistCollection.AddRange(songPlaylists);
// Now do the same for the AlbumPlaylists
List <AlbumPlaylist> albumPlaylists = await DbAccess.LoadAsync <AlbumPlaylist>();
// Get all the PlaylistItems
List <AlbumPlaylistItem> albumPlaylistItems = await DbAccess.LoadAsync <AlbumPlaylistItem>();
// Link the album playlist items to thier playlists
albumPlaylists.ForEach(playlist => playlist.GetContents(albumPlaylistItems));
PlaylistCollection.AddRange(albumPlaylists);
}
}
/// <summary>
/// Remove the supplied list of songs from local and persistent storage.
/// This is used for bulk deletion, so rather than removing each song from the collection, O(n), reform the collection ignoring
/// thoses to be delted
/// </summary>
/// <param name="songsToDelete"></param>
public static void DeleteSongs(List <Song> songsToDelete)
{
lock ( lockObject )
{
// Form a hash from all the song ids being deleted
HashSet <int> songIds = new(songsToDelete.Select(song => song.Id));
// Make a new collection that only contains entries not in the deleted songs
SongCollection = SongCollection.Where(song => songIds.Contains(song.Id) == false).ToList();
// Reform the lookups
artistAlbumLookup = new();
albumLookup = new();
IdLookup = new();
foreach (Song song in SongCollection)
{
IdLookup[song.Id] = song;
artistAlbumLookup.AddValue(song.ArtistAlbumId, song);
albumLookup.AddValue(song.AlbumId, song);
}
}
DbAccess.DeleteItemsAsync(songsToDelete);
}
