rework television media (#26)

* rework television media

* refactor poster saving

* television and movie views are working again

* remove dead code

* use paper styling for all cards

* add show poster, plot to seasons page

* remove missing shows; cleanup interfaces

* fix split show display (same show in different folders/sources)

* add placeholder "add to schedule" button

* no more duplicate television shows, even with the same show split across sources

* stop releasing CLI for now

* use season number as season placeholder

* add television shows to collections

* add television seasons to collections

* add television episodes to collections

* add movies to collections

* remove movies, shows, seasons, episodes from collections

* fix page width and menus

* fix buffer size defaults

* fix chronological episode ordering

* allow deleting media collections

* don't get stuck building a playout with an empty collection

* schedule editing and playouts work again

* minor cleanup

* remove dead code

* fix bugs with viewing movies as they are loading

* add scanner tests; support nested movie folders

* update collections docs

* rearrange order of schedule items

* add show and season to schedule

* delete schedules that use legacy collections, reset all posters

* move cleanup to new migration

* load fallback metadata when nfo fails; don't require metadata in ui

* update readme and screenshots

ErsatzTV.Core/Metadata/LocalFileSystem.cs

@@ -1,9 +1,9 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
-using System.Linq;
+using System.Threading.Tasks;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.Metadata;
-using LanguageExt;
 using static LanguageExt.Prelude;
 
 namespace ErsatzTV.Core.Metadata
@@ -16,52 +16,13 @@ namespace ErsatzTV.Core.Metadata
         public bool IsMediaSourceAccessible(LocalMediaSource localMediaSource) =>
             Directory.Exists(localMediaSource.Folder);
 
-        public Seq<string> FindRelevantVideos(LocalMediaSource localMediaSource)
-        {
-            Seq<string> allDirectories = Directory
-                .GetDirectories(localMediaSource.Folder, "*", SearchOption.AllDirectories)
-                .ToSeq()
-                .Add(localMediaSource.Folder);
+        public IEnumerable<string> ListSubdirectories(string folder) =>
+            Try(Directory.EnumerateDirectories(folder)).IfFail(new List<string>());
 
-            // remove any directories with an .etvignore file locally, or in any parent directory
-            Seq<string> excluded = allDirectories.Filter(ShouldExcludeDirectory);
-            Seq<string> relevantDirectories = allDirectories
-                .Filter(d => !excluded.Any(d.StartsWith))
-                .Filter(d => localMediaSource.MediaType == MediaType.Other || !IsExtrasFolder(d));
+        public IEnumerable<string> ListFiles(string folder) =>
+            Try(Directory.EnumerateFiles(folder, "*", SearchOption.TopDirectoryOnly)).IfFail(new List<string>());
 
-            return relevantDirectories
-                .Collect(d => Directory.GetFiles(d, "*", SearchOption.TopDirectoryOnly))
-                .Filter(file => KnownExtensions.Contains(Path.GetExtension(file)))
-                .OrderBy(identity)
-                .ToSeq();
-        }
-
-        public bool ShouldRefreshMetadata(LocalMediaSource localMediaSource, MediaItem mediaItem)
-        {
-            DateTime lastWrite = File.GetLastWriteTimeUtc(mediaItem.Path);
-            bool modified = lastWrite > mediaItem.LastWriteTime.IfNone(DateTime.MinValue);
-            return modified // media item has been modified
-                   || mediaItem.Metadata == null // media item has no metadata
-                   || mediaItem.Metadata.MediaType != localMediaSource.MediaType; // media item is typed incorrectly
-        }
-
-        public bool ShouldRefreshPoster(MediaItem mediaItem) =>
-            string.IsNullOrWhiteSpace(mediaItem.Poster);
-
-        private static bool ShouldExcludeDirectory(string path) => File.Exists(Path.Combine(path, ".etvignore"));
-
-        // see https://support.emby.media/support/solutions/articles/44001159102-movie-naming
-        private static bool IsExtrasFolder(string path) =>
-            ExtraFolderNames.Contains(Path.GetFileName(path)?.ToLowerInvariant());
-
-        // @formatter:off
-        private static readonly Seq<string> KnownExtensions = Seq(
-            ".mpg", ".mp2", ".mpeg", ".mpe", ".mpv", ".ogg", ".mp4",
-            ".m4p", ".m4v", ".avi", ".wmv", ".mov", ".mkv", ".ts");
-        
-        private static readonly Seq<string> ExtraFolderNames = Seq(
-            "extras", "specials", "shorts", "scenes", "featurettes",
-            "behind the scenes", "deleted scenes", "interviews", "trailers");
-        // @formatter:on
+        public bool FileExists(string path) => File.Exists(path);
+        public Task<byte[]> ReadAllBytes(string path) => File.ReadAllBytesAsync(path);
     }
 }