feat: Enhance favorites functionality; add favorites filtering to playlists and sounds, and improve favorite indicators in responses

app/services/favorite.py

@@ -6,9 +6,6 @@ from sqlmodel.ext.asyncio.session import AsyncSession
 
 from app.core.logging import get_logger
 from app.models.favorite import Favorite
-from app.models.playlist import Playlist
-from app.models.sound import Sound
-from app.models.user import User
 from app.repositories.favorite import FavoriteRepository
 from app.repositories.playlist import PlaylistRepository
 from app.repositories.sound import SoundRepository
@@ -62,7 +59,7 @@ class FavoriteService:
             existing = await favorite_repo.get_by_user_and_sound(user_id, sound_id)
             if existing:
                 raise ValueError(
-                    f"Sound {sound_id} is already favorited by user {user_id}"
+                    f"Sound {sound_id} is already favorited by user {user_id}",
                 )
 
             # Create favorite
@@ -106,11 +103,11 @@ class FavoriteService:
 
             # Check if already favorited
             existing = await favorite_repo.get_by_user_and_playlist(
-                user_id, playlist_id
+                user_id, playlist_id,
             )
             if existing:
                 raise ValueError(
-                    f"Playlist {playlist_id} is already favorited by user {user_id}"
+                    f"Playlist {playlist_id} is already favorited by user {user_id}",
                 )
 
             # Create favorite
@@ -159,16 +156,16 @@ class FavoriteService:
             favorite_repo = FavoriteRepository(session)
 
             favorite = await favorite_repo.get_by_user_and_playlist(
-                user_id, playlist_id
+                user_id, playlist_id,
             )
             if not favorite:
                 raise ValueError(
-                    f"Playlist {playlist_id} is not favorited by user {user_id}"
+                    f"Playlist {playlist_id} is not favorited by user {user_id}",
                 )
 
             await favorite_repo.delete(favorite)
             logger.info(
-                "User %s removed playlist %s from favorites", user_id, playlist_id
+                "User %s removed playlist %s from favorites", user_id, playlist_id,
             )
 
     async def get_user_favorites(
@@ -233,7 +230,7 @@ class FavoriteService:
         async with self.db_session_factory() as session:
             favorite_repo = FavoriteRepository(session)
             return await favorite_repo.get_user_playlist_favorites(
-                user_id, limit, offset
+                user_id, limit, offset,
             )
 
     async def is_sound_favorited(self, user_id: int, sound_id: int) -> bool:

app/services/playlist.py

@@ -246,6 +246,8 @@ class PlaylistService:
         include_stats: bool = False,
         limit: int | None = None,
         offset: int = 0,
+        favorites_only: bool = False,
+        current_user_id: int | None = None,
     ) -> list[dict]:
         """Search and sort playlists with optional statistics."""
         return await self.playlist_repo.search_and_sort(
@@ -256,6 +258,8 @@ class PlaylistService:
             include_stats=include_stats,
             limit=limit,
             offset=offset,
+            favorites_only=favorites_only,
+            current_user_id=current_user_id,
         )
 
     async def get_playlist_sounds(self, playlist_id: int) -> list[Sound]: