Use new ContentType.Parent to add series info to grid display

Source/LibationWinForms/GridView/QueryExtensions.cs

@@ -0,0 +1,58 @@
+using DataLayer;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace LibationWinForms.GridView
+{
+#nullable enable
+	internal static class QueryExtensions
+	{
+		public static IEnumerable<LibraryBookEntry> BookEntries(this IEnumerable<GridEntry> gridEntries)
+			=> gridEntries.OfType<LibraryBookEntry>();
+
+		public static IEnumerable<SeriesEntry> SeriesEntries(this IEnumerable<GridEntry> gridEntries)
+			=> gridEntries.OfType<SeriesEntry>();
+
+		public static T? FindByAsin<T>(this IEnumerable<T> gridEntries, string audibleProductID) where T : GridEntry
+			=> gridEntries.FirstOrDefault(i => i.AudibleProductId == audibleProductID);
+
+		public static IEnumerable<SeriesEntry> EmptySeries(this IEnumerable<GridEntry> gridEntries)
+			=> gridEntries.SeriesEntries().Where(i => i.Children.Count == 0);
+
+		public static bool IsProduct(this LibraryBook lb)
+			=> lb.Book.ContentType is not ContentType.Episode and not ContentType.Parent;
+
+		public static bool IsEpisodeChild(this LibraryBook lb)
+			=> lb.Book.ContentType is ContentType.Episode;
+
+		public static bool IsEpisodeParent(this LibraryBook lb)
+			=> lb.Book.ContentType is ContentType.Parent;
+
+		public static SeriesEntry? FindSeriesParent(this IEnumerable<GridEntry> gridEntries, LibraryBook seriesEpisode)
+		{
+			if (seriesEpisode.Book.SeriesLink is null) return null;
+
+			//Parent books will always have exactly 1 SeriesBook due to how
+			//they are imported in ApiExtended.getChildEpisodesAsync()
+			return gridEntries.SeriesEntries().FirstOrDefault(
+				lb =>
+				seriesEpisode.Book.SeriesLink.Any(
+					s => s.Series.AudibleSeriesId == lb.LibraryBook.Book.SeriesLink.Single().Series.AudibleSeriesId));
+		}
+
+		public static LibraryBook? FindSeriesParent(this IEnumerable<LibraryBook> libraryBooks, LibraryBook seriesEpisode)
+		{
+			if (seriesEpisode.Book.SeriesLink is null) return null;
+
+			//Parent books will always have exactly 1 SeriesBook due to how
+			//they are imported in ApiExtended.getChildEpisodesAsync()
+			return libraryBooks.FirstOrDefault(
+				lb =>
+				lb.IsEpisodeParent() &&
+				seriesEpisode.Book.SeriesLink.Any(
+					s => s.Series.AudibleSeriesId == lb.Book.SeriesLink.Single().Series.AudibleSeriesId));
+		}
+	}
+#nullable disable
+}