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84 lines
2.9 KiB
84 lines
2.9 KiB
"""Daily Mix generator — top library genre → discovery picks.
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Variant = rank position as a string ('1' / '2' / '3' / '4'). Each
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mix tracks the user's Nth top library genre and returns discovery
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picks within it. Top genres recompute at refresh time, so as the
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library evolves a mix's underlying genre can shift -- the playlist
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metadata records which genre was used at the most recent refresh
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so the UI can label the mix accurately.
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Note: previously this kind ambitiously promised 50% library + 50%
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discovery. The library half was a stub (`tracks` table has no
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source IDs to sync), so the new generator is discovery-only.
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A future enhancement can backfill source IDs into library rows
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and re-add the hybrid behavior."""
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from __future__ import annotations
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from typing import Any, List
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from core.personalized.generators._common import coerce_tracks, get_service
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from core.personalized.specs import PlaylistKindSpec, get_registry
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from core.personalized.types import PlaylistConfig, Track
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KIND = 'daily_mix'
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# Default rank set — UI surfaces 4 daily mixes by default.
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_DEFAULT_RANKS = ('1', '2', '3', '4')
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# Number of top library genres to consider when ranking.
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_MAX_TOP_GENRES = 8
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def _resolve_genre_for_rank(service, rank: int) -> str:
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"""Look up the user's Nth-ranked top library genre. Returns the
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genre key or '' when no genre at that rank.
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Calls ``service.get_top_genres_from_library(limit=...)`` and
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indexes the resulting (genre, count) tuples by 0-based rank.
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"""
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top = service.get_top_genres_from_library(limit=_MAX_TOP_GENRES) or []
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if rank < 1 or rank > len(top):
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return ''
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pair = top[rank - 1]
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if not pair:
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return ''
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# `top` is List[Tuple[str, int]] per service signature.
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return pair[0] if isinstance(pair, (tuple, list)) else str(pair)
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def generate(deps: Any, variant: str, config: PlaylistConfig) -> List[Track]:
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service = get_service(deps)
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try:
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rank = int(variant)
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except (TypeError, ValueError) as exc:
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raise ValueError(f"Daily Mix variant {variant!r} must be a rank int") from exc
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genre = _resolve_genre_for_rank(service, rank)
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if not genre:
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# User's library doesn't have enough genres for this rank.
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return []
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rows = service.get_genre_playlist(genre=genre, limit=config.limit)
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return coerce_tracks(rows)
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def variant_resolver(deps: Any) -> List[str]:
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"""Return the standard rank set."""
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return list(_DEFAULT_RANKS)
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SPEC = PlaylistKindSpec(
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kind=KIND,
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name_template='Daily Mix {variant}',
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description='Personalized mix based on your top library genres. One mix per top genre rank.',
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default_config=PlaylistConfig(limit=50, max_per_album=2, max_per_artist=3),
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generator=generate,
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variant_resolver=variant_resolver,
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requires_variant=True,
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tags=['discovery', 'personalized'],
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)
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if get_registry().get(KIND) is None:
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get_registry().register(SPEC)
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