优化扫描

internal/repository/media_repo.go

@@ -5,6 +5,12 @@ import (
 	"database/sql"
 )
 
+type ExistingMediaFile struct {
+	Path        string
+	MediaFileID int
+	HasSong     bool
+}
+
 type MediaRepository struct {
 	db *sql.DB
 }
@@ -63,6 +69,31 @@ func (r *MediaRepository) Create(path string, libraryID int) (model.MediaFile, e
 	}, nil
 }
 
+func (r *MediaRepository) ListExistingByLibrary(libraryID int) ([]ExistingMediaFile, error) {
+	rows, err := r.db.Query(`
+		SELECT mf.path, mf.id, CASE WHEN s.id IS NULL THEN 0 ELSE 1 END AS has_song
+		FROM media_files mf
+		LEFT JOIN songs s ON s.media_file_id = mf.id
+		WHERE mf.library_id = ?
+	`, libraryID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	existing := []ExistingMediaFile{}
+	for rows.Next() {
+		var item ExistingMediaFile
+		var hasSong int
+		if err := rows.Scan(&item.Path, &item.MediaFileID, &hasSong); err != nil {
+			return nil, err
+		}
+		item.HasSong = hasSong == 1
+		existing = append(existing, item)
+	}
+	return existing, nil
+}
+
 func (r *MediaRepository) GetSongsByLibraryWithDetails(libraryID int) ([]model.SongDetail, error) {
 	rows, err := r.db.Query(`
 		SELECT s.id, s.title, a.name as artist_name, al.title as album_title, s.duration, mf.path