public virtual CollectionDiffWithValue <LyricsForSong, LyricsForSong> SyncLyrics(IEnumerable <LyricsForSongContract> newLyrics)
{
ParamIs.NotNull(() => newLyrics);
var diff = CollectionHelper.Diff(Lyrics, newLyrics, (n1, n2) => n1.Id == n2.Id);
var created = new List <LyricsForSong>();
var edited = new List <LyricsForSong>();
foreach (var n in diff.Removed)
{
Lyrics.Remove(n);
}
foreach (var newEntry in diff.Added)
{
var l = CreateLyrics(newEntry.Language, newEntry.Value, newEntry.Source);
created.Add(l);
}
foreach (var linkEntry in diff.Unchanged)
{
var entry = linkEntry;
var newEntry = newLyrics.First(e => e.Id == entry.Id);
if (!entry.ContentEquals(newEntry))
{
linkEntry.Language = newEntry.Language;
linkEntry.Source = newEntry.Source;
linkEntry.Value = newEntry.Value;
edited.Add(linkEntry);
}
}
return(new CollectionDiffWithValue <LyricsForSong, LyricsForSong>(created, diff.Removed, diff.Unchanged, edited));
}