2 files changed, 74 insertions, 2 deletions
diff --git a/MediaBrowser.Controller/Library/ILocalSimilarItemsProvider.cs b/MediaBrowser.Controller/Library/ILocalSimilarItemsProvider.cs
index 9bf0121f5f..b8e41ec810 100644
--- a/MediaBrowser.Controller/Library/ILocalSimilarItemsProvider.cs
+++ b/MediaBrowser.Controller/Library/ILocalSimilarItemsProvider.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
@@ -6,11 +7,37 @@ using MediaBrowser.Controller.Entities;
 namespace MediaBrowser.Controller.Library;
 
 /// <summary>
+/// Provides similar items from the local library.
+/// Returns fully resolved BaseItems directly - no additional resolution needed.
+/// </summary>
+public interface ILocalSimilarItemsProvider : ISimilarItemsProvider
+{
+    /// <summary>
+    /// Determines whether the provider can handle items of the specified type.
+    /// </summary>
+    /// <param name="itemType">The item type.</param>
+    /// <returns><c>true</c> if the provider handles this item type; otherwise <c>false</c>.</returns>
+    bool Supports(Type itemType);
+
+    /// <summary>
+    /// Gets similar items from the local library.
+    /// </summary>
+    /// <param name="item">The source item to find similar items for.</param>
+    /// <param name="query">The query options (user, limit, exclusions, etc.).</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>The list of similar items from the library.</returns>
+    Task<IReadOnlyList<BaseItem>> GetSimilarItemsAsync(
+        BaseItem item,
+        SimilarItemsQuery query,
+        CancellationToken cancellationToken);
+}
+
+/// <summary>
 /// Provides similar items from the local library for a specific item type.
 /// Returns fully resolved BaseItems directly - no additional resolution needed.
 /// </summary>
 /// <typeparam name="TItemType">The type of item this provider handles.</typeparam>
-public interface ILocalSimilarItemsProvider<TItemType> : ISimilarItemsProvider
+public interface ILocalSimilarItemsProvider<TItemType> : ILocalSimilarItemsProvider
     where TItemType : BaseItem
 {
     /// <summary>
@@ -24,4 +51,13 @@ public interface ILocalSimilarItemsProvider<TItemType> : ISimilarItemsProvider
         TItemType item,
         SimilarItemsQuery query,
         CancellationToken cancellationToken);
+
+    bool ILocalSimilarItemsProvider.Supports(Type itemType)
+        => typeof(TItemType).IsAssignableFrom(itemType);
+
+    Task<IReadOnlyList<BaseItem>> ILocalSimilarItemsProvider.GetSimilarItemsAsync(
+        BaseItem item,
+        SimilarItemsQuery query,
+        CancellationToken cancellationToken)
+        => GetSimilarItemsAsync((TItemType)item, query, cancellationToken);
 }
diff --git a/MediaBrowser.Controller/Library/IRemoteSimilarItemsProvider.cs b/MediaBrowser.Controller/Library/IRemoteSimilarItemsProvider.cs
index a77b6628d9..3803e51769 100644
--- a/MediaBrowser.Controller/Library/IRemoteSimilarItemsProvider.cs
+++ b/MediaBrowser.Controller/Library/IRemoteSimilarItemsProvider.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using System.Threading;
 using MediaBrowser.Controller.Entities;
@@ -5,11 +6,37 @@ using MediaBrowser.Controller.Entities;
 namespace MediaBrowser.Controller.Library;
 
 /// <summary>
+/// Provides similar item references from remote/external sources.
+/// Returns lightweight references with ProviderIds that the manager resolves to library items.
+/// </summary>
+public interface IRemoteSimilarItemsProvider : ISimilarItemsProvider
+{
+    /// <summary>
+    /// Determines whether the provider can handle items of the specified type.
+    /// </summary>
+    /// <param name="itemType">The item type.</param>
+    /// <returns><c>true</c> if the provider handles this item type; otherwise <c>false</c>.</returns>
+    bool Supports(Type itemType);
+
+    /// <summary>
+    /// Gets similar item references from an external source as an async stream.
+    /// </summary>
+    /// <param name="item">The source item to find similar items for.</param>
+    /// <param name="query">The query options (user, limit, exclusions).</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>An async enumerable of similar item references.</returns>
+    IAsyncEnumerable<SimilarItemReference> GetSimilarItemsAsync(
+        BaseItem item,
+        SimilarItemsQuery query,
+        CancellationToken cancellationToken);
+}
+
+/// <summary>
 /// Provides similar item references from remote/external sources for a specific item type.
 /// Returns lightweight references with ProviderIds that the manager resolves to library items.
 /// </summary>
 /// <typeparam name="TItemType">The type of item this provider handles.</typeparam>
-public interface IRemoteSimilarItemsProvider<TItemType> : ISimilarItemsProvider
+public interface IRemoteSimilarItemsProvider<TItemType> : IRemoteSimilarItemsProvider
     where TItemType : BaseItem
 {
     /// <summary>
@@ -23,4 +50,13 @@ public interface IRemoteSimilarItemsProvider<TItemType> : ISimilarItemsProvider
         TItemType item,
         SimilarItemsQuery query,
         CancellationToken cancellationToken);
+
+    bool IRemoteSimilarItemsProvider.Supports(Type itemType)
+        => typeof(TItemType).IsAssignableFrom(itemType);
+
+    IAsyncEnumerable<SimilarItemReference> IRemoteSimilarItemsProvider.GetSimilarItemsAsync(
+        BaseItem item,
+        SimilarItemsQuery query,
+        CancellationToken cancellationToken)
+        => GetSimilarItemsAsync((TItemType)item, query, cancellationToken);
 }