stuff

app/api/schemas/playlist.py

@@ -29,3 +29,7 @@ class PlaylistUpdate(BaseModel):
 class PlaylistAddTrack(BaseModel):
     track_id: uuid.UUID
     position: float | None = None
+
+
+class PlaylistReorder(BaseModel):
+    track_ids: list[uuid.UUID]

app/api/v1/playlists.py

@@ -13,11 +13,17 @@ from app.api.deps import (
     TrackRepoDep,
 )
 from app.api.schemas.pagination import PagedResponse
-from app.api.schemas.playlist import PlaylistAddTrack, PlaylistCreate, PlaylistOut, PlaylistUpdate
+from app.api.schemas.playlist import (
+    PlaylistAddTrack,
+    PlaylistCreate,
+    PlaylistOut,
+    PlaylistReorder,
+    PlaylistUpdate,
+)
 from app.api.schemas.track import TrackOut
 from app.api.v1.tracks import _build_track_out
 from app.domain.entities.playlist import Playlist
-from app.domain.errors import NotFoundError, PermissionDeniedError
+from app.domain.errors import NotFoundError, PermissionDeniedError, ValidationError
 from app.infrastructure.db.repositories.playlist_repository import SqlAlchemyPlaylistRepository
 
 router = APIRouter(prefix="/playlists", tags=["playlists"])
@@ -182,7 +188,32 @@ async def remove_playlist_track(
 
 
 @router.put("/{playlist_id}/tracks/reorder")
-async def reorder_playlist_tracks(playlist_id: uuid.UUID, _: CurrentUser) -> Any: ...
+async def reorder_playlist_tracks(
+    playlist_id: uuid.UUID,
+    body: PlaylistReorder,
+    playlist_repo: PlaylistRepoDep,
+    user: CurrentUser,
+) -> PlaylistOut:
+    playlist = await playlist_repo.get_by_id(playlist_id)
+    if playlist is None:
+        raise NotFoundError(f"Playlist {playlist_id} not found.")
+    if playlist.owner_id != user.id:
+        raise PermissionDeniedError("You don't own this playlist.")
+
+    total = await playlist_repo.get_track_total(playlist_id)
+    current_tracks = (
+        await playlist_repo.get_tracks(playlist_id, limit=total, offset=0) if total else []
+    )
+    current_ids = {t.id for t in current_tracks}
+    given_ids = body.track_ids
+    if len(given_ids) != len(set(given_ids)) or set(given_ids) != current_ids:
+        raise ValidationError("track_ids must be a permutation of the playlist's current tracks.")
+
+    await playlist_repo.reorder_tracks(playlist_id, given_ids)
+    updated = await playlist_repo.get_by_id(playlist_id)
+    assert updated is not None
+    items = await _build_playlist_out([updated], playlist_repo)
+    return items[0]
 
 
 @router.get("/{playlist_id}/cover")