stuff

app/infrastructure/db/repositories/playlist_repository.py

@@ -138,9 +138,22 @@ class SqlAlchemyPlaylistRepository:
     async def get_track_total(self, playlist_id: uuid.UUID) -> int:
         return await self.track_count(playlist_id)
 
+    async def has_track(self, playlist_id: uuid.UUID, track_id: uuid.UUID) -> bool:
+        row = (
+            await self._session.execute(
+                select(PlaylistTrackModel.id).where(
+                    PlaylistTrackModel.playlist_id == playlist_id,
+                    PlaylistTrackModel.track_id == track_id,
+                )
+            )
+        ).scalar_one_or_none()
+        return row is not None
+
     async def add_track(
         self, playlist_id: uuid.UUID, track_id: uuid.UUID, *, position: float
     ) -> None:
+        if await self.has_track(playlist_id, track_id):
+            return
         row = PlaylistTrackModel(playlist_id=playlist_id, track_id=track_id, position=position)
         self._session.add(row)
         playlist = await self._session.get(PlaylistModel, playlist_id)
@@ -148,6 +161,26 @@ class SqlAlchemyPlaylistRepository:
             playlist.version = playlist.version + 1
         await self._session.flush()
 
+    async def reorder_tracks(
+        self, playlist_id: uuid.UUID, ordered_track_ids: list[uuid.UUID]
+    ) -> None:
+        rows = (
+            (
+                await self._session.execute(
+                    select(PlaylistTrackModel).where(PlaylistTrackModel.playlist_id == playlist_id)
+                )
+            )
+            .scalars()
+            .all()
+        )
+        by_track_id = {row.track_id: row for row in rows}
+        for position, track_id in enumerate(ordered_track_ids, start=1):
+            by_track_id[track_id].position = float(position)
+        playlist = await self._session.get(PlaylistModel, playlist_id)
+        if playlist is not None:
+            playlist.version = playlist.version + 1
+        await self._session.flush()
+
     async def remove_track(self, playlist_id: uuid.UUID, track_id: uuid.UUID) -> None:
         row = (
             await self._session.execute(