New: Write metadata to tags, with UI for previewing changes (#633)

src/NzbDrone.Core/History/HistoryService.cs

@@ -38,6 +38,7 @@ namespace NzbDrone.Core.History
                                   IHandle<DownloadCompletedEvent>,
                                   IHandle<TrackFileDeletedEvent>,
                                   IHandle<TrackFileRenamedEvent>,
+                                  IHandle<TrackFileRetaggedEvent>,
                                   IHandle<ArtistDeletedEvent>
     {
         private readonly IHistoryRepository _historyRepository;
@@ -345,6 +346,35 @@ namespace NzbDrone.Core.History
             }
         }
 
+        public void Handle(TrackFileRetaggedEvent message)
+        {
+            var path = Path.Combine(message.Artist.Path, message.TrackFile.RelativePath);
+            var relativePath = message.TrackFile.RelativePath;
+
+            foreach (var track in message.TrackFile.Tracks.Value)
+            {
+                var history = new History
+                {
+                    EventType = HistoryEventType.TrackFileRetagged,
+                    Date = DateTime.UtcNow,
+                    Quality = message.TrackFile.Quality,
+                    SourceTitle = path,
+                    ArtistId = message.TrackFile.Artist.Value.Id,
+                    AlbumId = message.TrackFile.AlbumId,
+                    TrackId = track.Id,
+                };
+                
+                history.Data.Add("TagsScrubbed", message.Scrubbed.ToString());
+                history.Data.Add("Diff", message.Diff.Select(x => new {
+                            Field = x.Key,
+                            OldValue = x.Value.Item1,
+                            NewValue = x.Value.Item2
+                        }).ToJson());
+
+                _historyRepository.Insert(history);
+            }
+        }
+
         public void Handle(ArtistDeletedEvent message)
         {
             _historyRepository.DeleteForArtist(message.Artist.Id);