"""ORM model for play history — an append-only event log (scrobbles).

``play_duration_seconds`` (how long was actually listened) feeds skip-rate for
future ML; ``completed`` marks a full play (plan §4).
"""

import datetime as dt
import uuid

from sqlalchemy import Boolean, DateTime, ForeignKey, Index, Integer, func
from sqlalchemy.orm import Mapped, mapped_column

from app.infrastructure.db.base import Base
from app.infrastructure.db.models.mixins import UUIDPrimaryKeyMixin


class PlayHistoryModel(UUIDPrimaryKeyMixin, Base):
    __tablename__ = "play_history"
    __table_args__ = (Index("ix_play_history_user_id_played_at", "user_id", "played_at"),)

    user_id: Mapped[uuid.UUID] = mapped_column(
        ForeignKey("users.id", ondelete="CASCADE"),
        nullable=False,
    )
    track_id: Mapped[uuid.UUID] = mapped_column(
        ForeignKey("tracks.id", ondelete="CASCADE"),
        index=True,
        nullable=False,
    )
    played_at: Mapped[dt.datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        nullable=False,
    )
    play_duration_seconds: Mapped[int | None] = mapped_column(Integer, nullable=True)
    completed: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)