1 files changed, 41 insertions, 0 deletions
diff --git a/MediaBrowser.Controller/Library/VersionResumeData.cs b/MediaBrowser.Controller/Library/VersionResumeData.cs
new file mode 100644
index 0000000000..772e2bf3a7
--- /dev/null
+++ b/MediaBrowser.Controller/Library/VersionResumeData.cs
@@ -0,0 +1,41 @@
+using System;
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Model.Dto;
+
+namespace MediaBrowser.Controller.Library
+{
+    /// <summary>
+    /// The user data of the most recently played alternate version that should drive the completion state of a multi-version item.
+    /// </summary>
+    /// <param name="VersionId">The id of the version that owns <paramref name="UserData"/>.</param>
+    /// <param name="UserData">The resume version's user data.</param>
+    public record VersionResumeData(Guid VersionId, UserItemData UserData)
+    {
+        /// <summary>
+        /// Merges the most recently played version's completion state into the supplied user data dto.
+        /// Completion (played) propagates to the primary. An in-progress resume position stays on the version
+        /// that owns it, which is surfaced directly (e.g. in resume queries) so that playback always targets
+        /// the correct version rather than resuming the primary at another version's offset. When the movie was
+        /// finished on a different version, the primary's own stale resume position is cleared so it does not
+        /// render as "watched and resumable" at the same time.
+        /// </summary>
+        /// <param name="dto">The user data dto to update.</param>
+        public void ApplyTo(UserItemDataDto dto)
+        {
+            dto.Played = dto.Played || UserData.Played;
+
+            if ((UserData.LastPlayedDate ?? DateTime.MinValue) > (dto.LastPlayedDate ?? DateTime.MinValue))
+            {
+                dto.LastPlayedDate = UserData.LastPlayedDate;
+            }
+
+            // A different version was finished (played, no resume position of its own) and is the most
+            // recently played: the whole movie is watched.
+            if (!VersionId.Equals(dto.ItemId) && UserData.Played && UserData.PlaybackPositionTicks <= 0)
+            {
+                dto.PlaybackPositionTicks = 0;
+                dto.PlayedPercentage = null;
+            }
+        }
+    }
+}