Always inherit from owner item and add tests

4 files changed, 189 insertions, 19 deletions

diff --git a/MediaBrowser.Controller/Entities/BaseItem.cs b/MediaBrowser.Controller/Entities/BaseItem.cs
index 41f7e796e8..cc3cba41c2 100644
--- a/MediaBrowser.Controller/Entities/BaseItem.cs
+++ b/MediaBrowser.Controller/Entities/BaseItem.cs
@@ -1533,15 +1533,27 @@ namespace MediaBrowser.Controller.Entities
             var extras = LibraryManager.FindExtras(item, fileSystemChildren, options.DirectoryService).ToArray();
             var newExtraIds = Array.ConvertAll(extras, x => x.Id);
 
-            var currentExtraIds = LibraryManager.GetItemList(new InternalItemsQuery()
+            var currentExtras = LibraryManager.GetItemList(new InternalItemsQuery()
             {
                 OwnerIds = [item.Id]
-            }).Select(e => e.Id).ToArray();
+            });
+
+            var currentExtraIds = currentExtras.Select(e => e.Id).ToArray();
 
             var extrasChanged = !currentExtraIds.OrderBy(x => x).SequenceEqual(newExtraIds.OrderBy(x => x));
 
             if (!extrasChanged && !options.ReplaceAllMetadata && options.MetadataRefreshMode != MetadataRefreshMode.FullRefresh)
             {
+                // The owner's dates may only have become known after its extras were created, so keep
+                // them in sync even when there is nothing to refresh.
+                foreach (var extra in currentExtras)
+                {
+                    if (extra.ExtraType is not null && InheritDatesFromOwner(item, extra))
+                    {
+                        await extra.UpdateToRepositoryAsync(ItemUpdateType.MetadataEdit, cancellationToken).ConfigureAwait(false);
+                    }
+                }
+
                 return false;
             }
 
@@ -1558,18 +1570,6 @@ namespace MediaBrowser.Controller.Entities
                 i.OwnerId = ownerId;
                 i.ParentId = Guid.Empty;
 
-                // Extras (e.g. trailers) frequently have no reliable date metadata of their own and
-                // would otherwise fall back to the file's container creation date. Inherit the owner's
-                // year/premiere date when the extra doesn't have one, so it stays consistent with the
-                // media it belongs to. Setting it before the refresh means the media info provider
-                // won't overwrite it from the file creation date.
-                if (i.ProductionYear is null && item.ProductionYear is not null)
-                {
-                    i.ProductionYear = item.ProductionYear;
-                    i.PremiereDate ??= item.PremiereDate;
-                    subOptions.ForceSave = true;
-                }
-
                 return RefreshMetadataForOwnedItem(i, true, subOptions, cancellationToken);
             });
 
@@ -2652,6 +2652,32 @@ namespace MediaBrowser.Controller.Entities
             }
         }
 
+        /// <summary>
+        /// Applies the owner's premiere date and production year to an owned item, returning whether anything changed.
+        /// </summary>
+        /// <param name="owner">The owner.</param>
+        /// <param name="ownedItem">The owned item.</param>
+        /// <returns><c>true</c> if the owned item was changed, else <c>false</c>.</returns>
+        internal static bool InheritDatesFromOwner(BaseItem owner, BaseItem ownedItem)
+        {
+            // Extras have no release date of their own, so the owner's is authoritative.
+            var changed = false;
+
+            if (owner.ProductionYear is not null && ownedItem.ProductionYear != owner.ProductionYear)
+            {
+                ownedItem.ProductionYear = owner.ProductionYear;
+                changed = true;
+            }
+
+            if (owner.PremiereDate is not null && ownedItem.PremiereDate != owner.PremiereDate)
+            {
+                ownedItem.PremiereDate = owner.PremiereDate;
+                changed = true;
+            }
+
+            return changed;
+        }
+
         protected async Task RefreshMetadataForOwnedItem(BaseItem ownedItem, bool copyTitleMetadata, MetadataRefreshOptions options, CancellationToken cancellationToken)
         {
             var newOptions = new MetadataRefreshOptions(options)
@@ -2711,6 +2737,11 @@ namespace MediaBrowser.Controller.Entities
                     ownedItem.CustomRating = item.CustomRating;
                     newOptions.ForceSave = true;
                 }
+
+                if (InheritDatesFromOwner(item, ownedItem))
+                {
+                    newOptions.ForceSave = true;
+                }
             }
 
             await ownedItem.RefreshMetadata(newOptions, cancellationToken).ConfigureAwait(false);
diff --git a/MediaBrowser.Providers/MediaInfo/FFProbeVideoInfo.cs b/MediaBrowser.Providers/MediaInfo/FFProbeVideoInfo.cs
index ff14f87923..1cb8e09414 100644
--- a/MediaBrowser.Providers/MediaInfo/FFProbeVideoInfo.cs
+++ b/MediaBrowser.Providers/MediaInfo/FFProbeVideoInfo.cs
@@ -386,7 +386,7 @@ namespace MediaBrowser.Providers.MediaInfo
             }
         }
 
-        private void FetchEmbeddedInfo(Video video, Model.MediaInfo.MediaInfo data, MetadataRefreshOptions refreshOptions, LibraryOptions libraryOptions)
+        internal void FetchEmbeddedInfo(Video video, Model.MediaInfo.MediaInfo data, MetadataRefreshOptions refreshOptions, LibraryOptions libraryOptions)
         {
             var replaceData = refreshOptions.ReplaceAllMetadata;
 
@@ -432,7 +432,9 @@ namespace MediaBrowser.Providers.MediaInfo
                 }
             }
 
-            if (data.ProductionYear is not null)
+            // Extras have no release date of their own, they inherit it from the item they belong to.
+            var useContainerDates = video.ExtraType is null;
+            if (useContainerDates && data.ProductionYear is not null)
             {
                 if (video.ProductionYear is null || replaceData)
                 {
@@ -440,9 +442,9 @@ namespace MediaBrowser.Providers.MediaInfo
                 }
             }
 
-            if (data.PremiereDate.HasValue)
+            if (useContainerDates && data.PremiereDate is not null)
             {
-                if (!video.PremiereDate.HasValue || replaceData)
+                if (video.PremiereDate is null || replaceData)
                 {
                     video.PremiereDate = data.PremiereDate;
                 }
@@ -482,7 +484,7 @@ namespace MediaBrowser.Providers.MediaInfo
             }
 
             // If we don't have a ProductionYear try and get it from PremiereDate
-            if (video.PremiereDate is not null && video.ProductionYear is null)
+            if (useContainerDates && video.PremiereDate is not null && video.ProductionYear is null)
             {
                 video.ProductionYear = video.PremiereDate.Value.ToLocalTime().Year;
             }
diff --git a/tests/Jellyfin.Controller.Tests/Entities/BaseItemTests.cs b/tests/Jellyfin.Controller.Tests/Entities/BaseItemTests.cs
index c0a2b0ecca..6234365ca3 100644
--- a/tests/Jellyfin.Controller.Tests/Entities/BaseItemTests.cs
+++ b/tests/Jellyfin.Controller.Tests/Entities/BaseItemTests.cs
@@ -5,6 +5,7 @@ using System.Reflection;
 using System.Threading;
 using Jellyfin.Database.Implementations.Entities;
 using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Entities.Movies;
 using MediaBrowser.Controller.Library;
 using MediaBrowser.Controller.LiveTv;
 using MediaBrowser.Controller.MediaSegments;
@@ -335,4 +336,80 @@ public class BaseItemTests
             Assert.Contains(alt2.Id, ids);
         }
     }
+
+    [Fact]
+    public void InheritDatesFromOwner_OwnerHasDates_OverwritesOwnedItemDates()
+    {
+        var owner = new Movie
+        {
+            ProductionYear = 1982,
+            PremiereDate = new DateTime(1982, 6, 25, 0, 0, 0, DateTimeKind.Utc)
+        };
+
+        // 2016 is what the container creation date of a re-encoded trailer would have yielded.
+        var trailer = new Trailer
+        {
+            ExtraType = ExtraType.Trailer,
+            ProductionYear = 2016,
+            PremiereDate = new DateTime(2016, 5, 4, 0, 0, 0, DateTimeKind.Utc)
+        };
+
+        Assert.True(BaseItem.InheritDatesFromOwner(owner, trailer));
+        Assert.Equal(owner.ProductionYear, trailer.ProductionYear);
+        Assert.Equal(owner.PremiereDate, trailer.PremiereDate);
+    }
+
+    [Fact]
+    public void InheritDatesFromOwner_OwnerHasNoDates_KeepsOwnedItemDates()
+    {
+        var owner = new Movie();
+        var trailer = new Trailer
+        {
+            ExtraType = ExtraType.Trailer,
+            ProductionYear = 1982,
+            PremiereDate = new DateTime(1982, 6, 25, 0, 0, 0, DateTimeKind.Utc)
+        };
+
+        Assert.False(BaseItem.InheritDatesFromOwner(owner, trailer));
+        Assert.Equal(1982, trailer.ProductionYear);
+        Assert.Equal(new DateTime(1982, 6, 25, 0, 0, 0, DateTimeKind.Utc), trailer.PremiereDate);
+    }
+
+    [Fact]
+    public void InheritDatesFromOwner_DatesAlreadyMatch_ReportsNoChange()
+    {
+        var owner = new Movie
+        {
+            ProductionYear = 1982,
+            PremiereDate = new DateTime(1982, 6, 25, 0, 0, 0, DateTimeKind.Utc)
+        };
+
+        var trailer = new Trailer
+        {
+            ExtraType = ExtraType.Trailer,
+            ProductionYear = owner.ProductionYear,
+            PremiereDate = owner.PremiereDate
+        };
+
+        Assert.False(BaseItem.InheritDatesFromOwner(owner, trailer));
+    }
+
+    [Fact]
+    public void InheritDatesFromOwner_OwnedItemHasNoDates_TakesOwnerDates()
+    {
+        var owner = new Movie
+        {
+            ProductionYear = 1982,
+            PremiereDate = new DateTime(1982, 6, 25, 0, 0, 0, DateTimeKind.Utc)
+        };
+
+        var trailer = new Trailer
+        {
+            ExtraType = ExtraType.Trailer
+        };
+
+        Assert.True(BaseItem.InheritDatesFromOwner(owner, trailer));
+        Assert.Equal(1982, trailer.ProductionYear);
+        Assert.Equal(new DateTime(1982, 6, 25, 0, 0, 0, DateTimeKind.Utc), trailer.PremiereDate);
+    }
 }
diff --git a/tests/Jellyfin.Providers.Tests/MediaInfo/FFProbeVideoInfoTests.cs b/tests/Jellyfin.Providers.Tests/MediaInfo/FFProbeVideoInfoTests.cs
index 2438ef06d1..59d3f42edf 100644
--- a/tests/Jellyfin.Providers.Tests/MediaInfo/FFProbeVideoInfoTests.cs
+++ b/tests/Jellyfin.Providers.Tests/MediaInfo/FFProbeVideoInfoTests.cs
@@ -3,7 +3,9 @@ using AutoFixture;
 using AutoFixture.AutoMoq;
 using MediaBrowser.Controller.Configuration;
 using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Providers;
 using MediaBrowser.Model.Configuration;
+using MediaBrowser.Model.Entities;
 using MediaBrowser.Providers.MediaInfo;
 using Moq;
 using Xunit;
@@ -75,4 +77,62 @@ public class FFProbeVideoInfoTests
 
         Assert.All(chapters, chapter => Assert.True(chapter.StartPositionTicks < runtime));
     }
+
+    [Theory]
+    [InlineData(false)]
+    [InlineData(true)]
+    public void FetchEmbeddedInfo_NoExtra_AppliesContainerDates(bool replaceAllMetadata)
+    {
+        var video = new Video();
+
+        _fFProbeVideoInfo.FetchEmbeddedInfo(video, CreateMediaInfoWithDates(), CreateRefreshOptions(replaceAllMetadata), new LibraryOptions());
+
+        Assert.Equal(2016, video.ProductionYear);
+        Assert.Equal(new DateTime(2016, 5, 4, 0, 0, 0, DateTimeKind.Utc), video.PremiereDate);
+    }
+
+    [Theory]
+    [InlineData(false)]
+    [InlineData(true)]
+    public void FetchEmbeddedInfo_Extra_IgnoresContainerDates(bool replaceAllMetadata)
+    {
+        var video = new Video
+        {
+            ExtraType = ExtraType.Trailer,
+            ProductionYear = 1982,
+            PremiereDate = new DateTime(1982, 6, 25, 0, 0, 0, DateTimeKind.Utc)
+        };
+
+        _fFProbeVideoInfo.FetchEmbeddedInfo(video, CreateMediaInfoWithDates(), CreateRefreshOptions(replaceAllMetadata), new LibraryOptions());
+
+        Assert.Equal(1982, video.ProductionYear);
+        Assert.Equal(new DateTime(1982, 6, 25, 0, 0, 0, DateTimeKind.Utc), video.PremiereDate);
+    }
+
+    [Fact]
+    public void FetchEmbeddedInfo_ExtraWithoutDates_StaysWithoutDates()
+    {
+        var video = new Video
+        {
+            ExtraType = ExtraType.Trailer
+        };
+
+        _fFProbeVideoInfo.FetchEmbeddedInfo(video, CreateMediaInfoWithDates(), CreateRefreshOptions(false), new LibraryOptions());
+
+        Assert.Null(video.ProductionYear);
+        Assert.Null(video.PremiereDate);
+    }
+
+    private static MediaBrowser.Model.MediaInfo.MediaInfo CreateMediaInfoWithDates()
+        => new()
+        {
+            ProductionYear = 2016,
+            PremiereDate = new DateTime(2016, 5, 4, 0, 0, 0, DateTimeKind.Utc)
+        };
+
+    private static MetadataRefreshOptions CreateRefreshOptions(bool replaceAllMetadata)
+        => new(Mock.Of<IDirectoryService>())
+        {
+            ReplaceAllMetadata = replaceAllMetadata
+        };
 }