feat(playlists): add Evaluate method to PlaylistRepository

Refactor refreshSmartPlaylist into guard checks + core evaluation logic
(doRefreshSmartPlaylist). Add public Evaluate method that bypasses
ownership/delay guards for system-level evaluation (e.g., background
processing after scanner import).

Part of #4539

model/playlist.go

@@ -131,6 +131,7 @@ type PlaylistRepository interface {
 	Delete(id string) error
 	Tracks(playlistId string, refreshSmartPlaylist bool) PlaylistTrackRepository
 	GetPlaylists(mediaFileId string) (Playlists, error)
+	Evaluate(id string) error
 }
 
 type PlaylistTrack struct {

persistence/playlist_repository.go

@@ -215,6 +215,10 @@ func (r *playlistRepository) refreshSmartPlaylist(pls *model.Playlist) bool {
 		return false
 	}
 
+	return r.doRefreshSmartPlaylist(pls, usr.ID)
+}
+
+func (r *playlistRepository) doRefreshSmartPlaylist(pls *model.Playlist, userID string) bool {
 	log.Debug(r.ctx, "Refreshing smart playlist", "playlist", pls.Name, "id", pls.ID)
 	start := time.Now()
 
@@ -244,11 +248,11 @@ func (r *playlistRepository) refreshSmartPlaylist(pls *model.Playlist) bool {
 		From("media_file").LeftJoin("annotation on ("+
 		"annotation.item_id = media_file.id"+
 		" AND annotation.item_type = 'media_file'"+
-		" AND annotation.user_id = ?)", usr.ID)
+		" AND annotation.user_id = ?)", userID)
 
 	// Conditionally join album/artist annotation tables only when referenced by criteria or sort
 	requiredJoins := rules.RequiredJoins()
-	sq = r.addSmartPlaylistAnnotationJoins(sq, requiredJoins, usr.ID)
+	sq = r.addSmartPlaylistAnnotationJoins(sq, requiredJoins, userID)
 
 	// Only include media files from libraries the user has access to
 	sq = r.applyLibraryFilter(sq, "media_file")
@@ -261,8 +265,8 @@ func (r *playlistRepository) refreshSmartPlaylist(pls *model.Playlist) bool {
 			LeftJoin("annotation on ("+
 				"annotation.item_id = media_file.id"+
 				" AND annotation.item_type = 'media_file'"+
-				" AND annotation.user_id = ?)", usr.ID)
+				" AND annotation.user_id = ?)", userID)
-		countSq = r.addSmartPlaylistAnnotationJoins(countSq, exprJoins, usr.ID)
+		countSq = r.addSmartPlaylistAnnotationJoins(countSq, exprJoins, userID)
 		countSq = r.applyLibraryFilter(countSq, "media_file")
 		countSq = countSq.Where(rules)
 
@@ -310,6 +314,18 @@ func (r *playlistRepository) refreshSmartPlaylist(pls *model.Playlist) bool {
 	return true
 }
 
+func (r *playlistRepository) Evaluate(id string) error {
+	pls, err := r.Get(id)
+	if err != nil {
+		return err
+	}
+	if !pls.IsSmartPlaylist() {
+		return nil
+	}
+	r.doRefreshSmartPlaylist(pls, pls.OwnerID)
+	return nil
+}
+
 func (r *playlistRepository) addSmartPlaylistAnnotationJoins(sq SelectBuilder, joins criteria.JoinType, userID string) SelectBuilder {
 	if joins.Has(criteria.JoinAlbumAnnotation) {
 		sq = sq.LeftJoin("annotation AS album_annotation ON ("+

persistence/playlist_repository_test.go

@@ -254,6 +254,57 @@ var _ = Describe("PlaylistRepository", func() {
 		})
 	})
 
+	Describe("Evaluate", func() {
+		var testPlaylistID string
+
+		BeforeEach(func() {
+			DeferCleanup(configtest.SetupConfig())
+		})
+
+		AfterEach(func() {
+			if testPlaylistID != "" {
+				_ = repo.Delete(testPlaylistID)
+				testPlaylistID = ""
+			}
+		})
+
+		It("evaluates a smart playlist and sets EvaluatedAt and SongCount", func() {
+			rules := &criteria.Criteria{
+				Expression: criteria.All{
+					criteria.Contains{"title": "Day"},
+				},
+			}
+			newPls := model.Playlist{Name: "Evaluate Test", OwnerID: "userid", Rules: rules}
+			Expect(repo.Put(&newPls)).To(Succeed())
+			testPlaylistID = newPls.ID
+
+			Expect(repo.Evaluate(newPls.ID)).To(Succeed())
+
+			saved, err := repo.Get(newPls.ID)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(saved.EvaluatedAt).ToNot(BeNil())
+			Expect(*saved.EvaluatedAt).To(BeTemporally("~", time.Now(), 2*time.Second))
+			Expect(saved.SongCount).To(BeNumerically(">", 0))
+		})
+
+		It("is a no-op for non-smart playlists", func() {
+			newPls := model.Playlist{Name: "Regular Playlist", OwnerID: "userid"}
+			Expect(repo.Put(&newPls)).To(Succeed())
+			testPlaylistID = newPls.ID
+
+			Expect(repo.Evaluate(newPls.ID)).To(Succeed())
+
+			saved, err := repo.Get(newPls.ID)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(saved.EvaluatedAt).To(BeNil())
+		})
+
+		It("returns ErrNotFound for a non-existent playlist ID", func() {
+			err := repo.Evaluate("nonexistent-id")
+			Expect(err).To(MatchError(model.ErrNotFound))
+		})
+	})
+
 	Describe("Playlist Track Sorting", func() {
 		var testPlaylistID string
 

tests/mock_playlist_repo.go

@@ -108,4 +108,11 @@ func (m *MockPlaylistRepo) CountAll(_ ...model.QueryOptions) (int64, error) {
 	return int64(len(m.Data)), nil
 }
 
+func (m *MockPlaylistRepo) Evaluate(_ string) error {
+	if m.Err {
+		return errors.New("error")
+	}
+	return nil
+}
+
 var _ model.PlaylistRepository = (*MockPlaylistRepo)(nil)