From 4a261a3ec05bcd114885a66def4a6212411491d8 Mon Sep 17 00:00:00 2001
From: Claus Vium <cvium@users.noreply.github.com>
Date: Fri, 23 Sep 2022 23:09:37 -0400
Subject: [PATCH] Backport pull request #8348 from jellyfin/release-10.8.z

Revert "Revert "refactor: use season number and episode number for NextUp ordering instead of SortName""

Original-merge: 88d5230babbc9498a6142ef56b1c0a9731936a40

Merged-by: Bond-009 <bond.009@outlook.com>

Backported-by: Joshua M. Boniface <joshua@boniface.me>
---
 .../TV/TVSeriesManager.cs                     | 43 +++++++------------
 1 file changed, 16 insertions(+), 27 deletions(-)

diff --git a/Emby.Server.Implementations/TV/TVSeriesManager.cs b/Emby.Server.Implementations/TV/TVSeriesManager.cs
index d7ab9c021e..6005896ad9 100644
--- a/Emby.Server.Implementations/TV/TVSeriesManager.cs
+++ b/Emby.Server.Implementations/TV/TVSeriesManager.cs
@@ -135,20 +135,15 @@ namespace Emby.Server.Implementations.TV
             return GetResult(episodes, request);
         }
 
-        public IEnumerable<Episode> GetNextUpEpisodes(NextUpQuery request, User user, IReadOnlyList<string> seriesKeys, DtoOptions dtoOptions)
+        private IEnumerable<Episode> GetNextUpEpisodes(NextUpQuery request, User user, IReadOnlyList<string> seriesKeys, DtoOptions dtoOptions)
         {
-            // Avoid implicitly captured closure
-            var currentUser = user;
-
-            var allNextUp = seriesKeys
-                .Select(i => GetNextUp(i, currentUser, dtoOptions, false));
+            var allNextUp = seriesKeys.Select(i => GetNextUp(i, user, dtoOptions, false));
 
             if (request.EnableRewatching)
             {
                 allNextUp = allNextUp.Concat(
-                    seriesKeys.Select(i => GetNextUp(i, currentUser, dtoOptions, true))
-                )
-                .OrderByDescending(i => i.Item1);
+                    seriesKeys.Select(i => GetNextUp(i, user, dtoOptions, true)))
+                .OrderByDescending(i => i.LastWatchedDate);
             }
 
             // If viewing all next up for all series, remove first episodes
@@ -161,23 +156,18 @@ namespace Emby.Server.Implementations.TV
                 {
                     if (request.DisableFirstEpisode)
                     {
-                        return i.Item1 != DateTime.MinValue;
+                        return i.LastWatchedDate != DateTime.MinValue;
                     }
 
-                    if (alwaysEnableFirstEpisode || (i.Item1 != DateTime.MinValue && i.Item1.Date >= request.NextUpDateCutoff))
+                    if (alwaysEnableFirstEpisode || (i.LastWatchedDate != DateTime.MinValue && i.LastWatchedDate.Date >= request.NextUpDateCutoff))
                     {
                         anyFound = true;
                         return true;
                     }
 
-                    if (!anyFound && i.Item1 == DateTime.MinValue)
-                    {
-                        return true;
-                    }
-
-                    return false;
+                    return !anyFound && i.LastWatchedDate == DateTime.MinValue;
                 })
-                .Select(i => i.Item2())
+                .Select(i => i.GetEpisodeFunction())
                 .Where(i => i != null);
         }
 
@@ -195,14 +185,14 @@ namespace Emby.Server.Implementations.TV
         /// Gets the next up.
         /// </summary>
         /// <returns>Task{Episode}.</returns>
-        private Tuple<DateTime, Func<Episode>> GetNextUp(string seriesKey, User user, DtoOptions dtoOptions, bool rewatching)
+        private (DateTime LastWatchedDate, Func<Episode> GetEpisodeFunction) GetNextUp(string seriesKey, User user, DtoOptions dtoOptions, bool rewatching)
         {
             var lastQuery = new InternalItemsQuery(user)
             {
                 AncestorWithPresentationUniqueKey = null,
                 SeriesPresentationUniqueKey = seriesKey,
                 IncludeItemTypes = new[] { BaseItemKind.Episode },
-                OrderBy = new[] { (ItemSortBy.SortName, SortOrder.Descending) },
+                OrderBy = new[] { (ItemSortBy.ParentIndexNumber, SortOrder.Descending), (ItemSortBy.IndexNumber, SortOrder.Descending) },
                 IsPlayed = true,
                 Limit = 1,
                 ParentIndexNumberNotEquals = 0,
@@ -216,24 +206,23 @@ namespace Emby.Server.Implementations.TV
             if (rewatching)
             {
                 // find last watched by date played, not by newest episode watched
-                lastQuery.OrderBy = new[] { (ItemSortBy.DatePlayed, SortOrder.Descending) };
+                lastQuery.OrderBy = new[] { (ItemSortBy.DatePlayed, SortOrder.Descending), (ItemSortBy.ParentIndexNumber, SortOrder.Descending), (ItemSortBy.IndexNumber, SortOrder.Descending) };
             }
 
             var lastWatchedEpisode = _libraryManager.GetItemList(lastQuery).Cast<Episode>().FirstOrDefault();
 
-            Func<Episode> getEpisode = () =>
+            Episode GetEpisode()
             {
                 var nextQuery = new InternalItemsQuery(user)
                 {
                     AncestorWithPresentationUniqueKey = null,
                     SeriesPresentationUniqueKey = seriesKey,
                     IncludeItemTypes = new[] { BaseItemKind.Episode },
-                    OrderBy = new[] { (ItemSortBy.SortName, SortOrder.Ascending) },
+                    OrderBy = new[] { (ItemSortBy.ParentIndexNumber, SortOrder.Ascending), (ItemSortBy.IndexNumber, SortOrder.Ascending) },
                     Limit = 1,
                     IsPlayed = rewatching,
                     IsVirtualItem = false,
                     ParentIndexNumberNotEquals = 0,
-                    MinSortName = lastWatchedEpisode?.SortName,
                     DtoOptions = dtoOptions
                 };
 
@@ -297,7 +286,7 @@ namespace Emby.Server.Implementations.TV
                 }
 
                 return nextEpisode;
-            };
+            }
 
             if (lastWatchedEpisode != null)
             {
@@ -305,11 +294,11 @@ namespace Emby.Server.Implementations.TV
 
                 var lastWatchedDate = userData.LastPlayedDate ?? DateTime.MinValue.AddDays(1);
 
-                return new Tuple<DateTime, Func<Episode>>(lastWatchedDate, getEpisode);
+                return (lastWatchedDate, GetEpisode);
             }
 
             // Return the first episode
-            return new Tuple<DateTime, Func<Episode>>(DateTime.MinValue, getEpisode);
+            return (DateTime.MinValue, GetEpisode);
         }
 
         private static QueryResult<BaseItem> GetResult(IEnumerable<BaseItem> items, NextUpQuery query)