Remove missing media (#40)

* remove movies that are no longer present on disk

* remove missing episodes, empty seasons, empty shows

ErsatzTV.Core/Interfaces/Repositories/IMovieRepository.cs

@@ -13,5 +13,7 @@ namespace ErsatzTV.Core.Interfaces.Repositories
         Task<bool> Update(Movie movie);
         Task<int> GetMovieCount();
         Task<List<MovieMetadata>> GetPagedMovies(int pageNumber, int pageSize);
+        Task<IEnumerable<string>> FindMoviePaths(LibraryPath libraryPath);
+        Task<Unit> DeleteByPath(LibraryPath libraryPath, string path);
     }
 }

ErsatzTV.Core/Interfaces/Repositories/ITelevisionRepository.cs

@@ -27,6 +27,9 @@ namespace ErsatzTV.Core.Interfaces.Repositories
         Task<Either<BaseError, Show>> AddShow(int libraryPathId, string showFolder, ShowMetadata metadata);
         Task<Either<BaseError, Season>> GetOrAddSeason(Show show, int libraryPathId, int seasonNumber);
         Task<Either<BaseError, Episode>> GetOrAddEpisode(Season season, LibraryPath libraryPath, string path);
-        Task<Unit> DeleteEmptyShows();
+        Task<IEnumerable<string>> FindEpisodePaths(LibraryPath libraryPath);
+        Task<Unit> DeleteByPath(LibraryPath libraryPath, string path);
+        Task<Unit> DeleteEmptySeasons(LibraryPath libraryPath);
+        Task<Unit> DeleteEmptyShows(LibraryPath libraryPath);
     }
 }

ErsatzTV.Core/Metadata/MovieFolderScanner.cs

@@ -71,6 +71,7 @@ namespace ErsatzTV.Core.Metadata
                     continue;
                 }
 
+
                 foreach (string file in allFiles.OrderBy(identity))
                 {
                     // TODO: optimize dbcontext use here, do we need tracking? can we make partial updates with dapper?
@@ -86,6 +87,15 @@ namespace ErsatzTV.Core.Metadata
                 }
             }
 
+            foreach (string path in await _movieRepository.FindMoviePaths(libraryPath))
+            {
+                if (!_localFileSystem.FileExists(path))
+                {
+                    _logger.LogInformation("Removing missing movie at {Path}", path);
+                    await _movieRepository.DeleteByPath(libraryPath, path);
+                }
+            }
+
             return Unit.Default;
         }
 

ErsatzTV.Core/Metadata/TelevisionFolderScanner.cs

@@ -63,7 +63,17 @@ namespace ErsatzTV.Core.Metadata
                     _ => Task.FromResult(Unit.Default));
             }
 
-            await _televisionRepository.DeleteEmptyShows();
+            foreach (string path in await _televisionRepository.FindEpisodePaths(libraryPath))
+            {
+                if (!_localFileSystem.FileExists(path))
+                {
+                    _logger.LogInformation("Removing missing episode at {Path}", path);
+                    await _televisionRepository.DeleteByPath(libraryPath, path);
+                }
+            }
+
+            await _televisionRepository.DeleteEmptySeasons(libraryPath);
+            await _televisionRepository.DeleteEmptyShows(libraryPath);
 
             return Unit.Default;
         }