add yaml marathon search content source (#1845)

* use search queries to populate marathons

* group marathon by artist

* add marathon group by album

ErsatzTV.Core/Scheduling/PlaylistEnumerator.cs

@@ -24,7 +24,9 @@ public class PlaylistEnumerator : IMediaCollectionEnumerator
 
     public CollectionEnumeratorState State { get; private set; }
 
-    public Option<MediaItem> Current => _sortedEnumerators[_enumeratorIndex].Current;
+    public Option<MediaItem> Current => _sortedEnumerators.Count > 0
+        ? _sortedEnumerators[_enumeratorIndex].Current
+        : Option<MediaItem>.None;
 
     public Option<bool> CurrentIncludeInProgramGuide
     {

ErsatzTV.Core/Scheduling/YamlScheduling/Models/YamlPlayoutContentMarathonItem.cs

@@ -8,6 +8,8 @@ public class YamlPlayoutContentMarathonItem : YamlPlayoutContentItem
 
     public List<YamlPlayoutContentGuid> Guids { get; set; } = [];
 
+    public List<string> Searches { get; set; } = [];
+
     [YamlMember(Alias = "group_by", ApplyNamingConventions = false)]
     public string GroupBy { get; set; }
 

ErsatzTV.Core/Scheduling/YamlScheduling/YamlPlayoutMarathonHelper.cs

@@ -25,6 +25,12 @@ public class YamlPlayoutMarathonHelper(IMediaCollectionRepository mediaCollectio
             allMediaItems.AddRange(await mediaCollectionRepository.GetShowItemsByShowGuids([showGuid]));
         }
 
+        // grab items from each search
+        foreach (string query in marathon.Searches)
+        {
+            allMediaItems.AddRange(await mediaCollectionRepository.GetSmartCollectionItems(query));
+        }
+
         List<IGrouping<GroupKey, MediaItem>> groups = [];
 
         // group by show
@@ -37,6 +43,16 @@ public class YamlPlayoutMarathonHelper(IMediaCollectionRepository mediaCollectio
         {
             groups.AddRange(allMediaItems.GroupBy(MediaItemKeyBySeason));
         }
+        // group by artist
+        else if (string.Equals(marathon.GroupBy, "artist", StringComparison.OrdinalIgnoreCase))
+        {
+            groups.AddRange(allMediaItems.GroupBy(MediaItemKeyByArtist));
+        }
+        // group by album
+        else if (string.Equals(marathon.GroupBy, "album", StringComparison.OrdinalIgnoreCase))
+        {
+            groups.AddRange(allMediaItems.GroupBy(MediaItemKeyByAlbum));
+        }
 
         Dictionary<PlaylistItem, List<MediaItem>> itemMap = [];
 
@@ -78,6 +94,30 @@ public class YamlPlayoutMarathonHelper(IMediaCollectionRepository mediaCollectio
             _ => new GroupKey(ProgramScheduleItemCollectionType.TelevisionSeason, null, null, null, 0)
         };
 
+    private static GroupKey MediaItemKeyByArtist(MediaItem mediaItem) =>
+        mediaItem switch
+        {
+            MusicVideo mv => new GroupKey(
+                ProgramScheduleItemCollectionType.Artist,
+                null,
+                null,
+                null,
+                mv.ArtistId),
+            _ => new GroupKey(ProgramScheduleItemCollectionType.Artist, null, null, null, 0)
+        };
+
+    private static GroupKey MediaItemKeyByAlbum(MediaItem mediaItem) =>
+        mediaItem switch
+        {
+            Song s => new GroupKey(
+                ProgramScheduleItemCollectionType.Collection,
+                s.SongMetadata.HeadOrNone().Map(sm => sm.Album.GetHashCode()).IfNone(0),
+                null,
+                null,
+                null),
+            _ => new GroupKey(ProgramScheduleItemCollectionType.Collection, 0, null, null, null)
+        };
+
     private static PlaylistItem GroupToPlaylistItem(
         int index,
         YamlPlayoutContentMarathonItem marathon,