fix: album_info yields pages (flatten), track items use flat format; track GenericError handling

- Album: flatten generator pages with list comprehension, parse flat track.{name,artists,...} directly
- Track: try both URI and URL, report GenericError clearly instead of crashing

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/spotify_resolve.py

@@ -64,13 +64,23 @@ def resolve(sp_type, sp_id):
     url = f'https://open.spotify.com/{sp_type}/{sp_id}'
 
     if sp_type == 'track':
-        # song_info expects a Spotify URI, not a full URL
-        uri = f'spotify:track:{sp_id}'
-        raw = sp_mod.Public().song_info(uri)
-        eprint(f'[spotapi] track raw type={type(raw).__name__} keys={list(raw.keys()) if isinstance(raw, dict) else "?"}')
-        if isinstance(raw, dict):
-            for k, v in raw.items():
-                eprint(f'[spotapi]   track[{k!r}] = {repr(v)[:160]}')
+        pub = sp_mod.Public()
+        # Try URI first, then full URL
+        raw = None
+        for arg in [f'spotify:track:{sp_id}', url]:
+            try:
+                r = pub.song_info(arg)
+                tu_type = ((r.get('data') or {}).get('trackUnion') or {}).get('__typename', '')
+                if tu_type == 'GenericError':
+                    eprint(f'[spotapi] song_info({arg!r}) → GenericError, trying next')
+                    continue
+                raw = r
+                break
+            except Exception as e:
+                eprint(f'[spotapi] song_info({arg!r}) failed: {e}')
+        if raw is None:
+            raise Exception(f'song_info returned GenericError for all inputs — track may require auth or be region-locked')
+        eprint(f'[spotapi] track raw keys={list(raw.keys())}')
         d  = (raw.get('data') or {}) if isinstance(raw, dict) else {}
         tu = d.get('trackUnion') or d
         tr = _parse_track({'itemV2': {'data': {'trackUnion': tu}}}) or {
@@ -89,7 +99,7 @@ def resolve(sp_type, sp_id):
 
     if sp_type == 'album':
         # PublicAlbum.get_album_info() → metadata (data.albumUnion.{name,artists,coverArt})
-        # Public().album_info(url)     → generator that yields track items
+        # Public().album_info(url)     → generator that yields PAGES (lists of track dicts)
         cls_name = next((n for n in ('PublicAlbum', 'Album') if n in available), None)
         alb_meta = getattr(sp_mod, cls_name)(url).get_album_info() if cls_name else {}
         d  = (alb_meta.get('data') or {}) if isinstance(alb_meta, dict) else {}
@@ -102,15 +112,33 @@ def resolve(sp_type, sp_id):
         cover_items = (au.get('coverArt') or {}).get('sources') or []
         art = cover_items[0].get('url', '') if cover_items else ''
 
-        # album_info(url) yields track items — consume the generator
-        raw_tracks = list(sp_mod.Public().album_info(url))
-        eprint(f'[spotapi] album_info generator → {len(raw_tracks)} items; first={repr(raw_tracks[0])[:200] if raw_tracks else "none"}')
+        # Flatten pages from the generator: each page is a list of track dicts
+        raw_tracks = [item for page in sp_mod.Public().album_info(url)
+                      for item in (page if isinstance(page, list) else [page])]
+        eprint(f'[spotapi] album_info → {len(raw_tracks)} tracks; first={repr(raw_tracks[0])[:200] if raw_tracks else "none"}')
+
         def _alb_track(item):
-            # items may be dicts with various shapes — log on parse failure
-            tr = _parse_track({'itemV2': item}, default_album=name, default_art=art, default_artist=artist)
-            if not tr:
-                tr = _parse_track(item, default_album=name, default_art=art, default_artist=artist)
-            return tr
+            # Track items are flat: {track: {name, artists, contentRating, duration, trackNumber}}
+            t = item.get('track') or item
+            if not isinstance(t, dict): return None
+            artist_items2 = (t.get('artists') or {}).get('items') or []
+            artists = ', '.join(
+                (a.get('profile') or {}).get('name', '') for a in artist_items2
+            ) or artist
+            dur_ms = (t.get('duration') or {}).get('totalMilliseconds')
+            rating = (t.get('contentRating') or {}).get('label', '')
+            track_name = t.get('name', '')
+            if not track_name: return None
+            return {
+                'trackName':         track_name,
+                'artistName':        artists,
+                'collectionName':    name,
+                'artworkUrl100':     art,
+                'releaseDate':       '',
+                'trackNumber':       t.get('trackNumber'),
+                'trackExplicitness': 'explicit' if rating == 'EXPLICIT' else 'notExplicit',
+                'durationMs':        dur_ms,
+            }
         tracks = [t for t in (_alb_track(i) for i in raw_tracks) if t]
         eprint(f'[spotapi] album ok — {len(tracks)} tracks')
         return {'type': 'album', 'name': name, 'artist': artist, 'artworkUrl': art, 'tracks': tracks}