"""User watchlists -- section 17, additive (accounts/ratings/watchlist).

Polymorphic across movie/series, same shape as Rating -- no value beyond
membership, so no extra columns beyond the timestamps."""

from __future__ import annotations

import uuid

from sqlalchemy import ForeignKey, Index, String, UniqueConstraint
from sqlalchemy.orm import Mapped, mapped_column

from app.models.base import Base, TimestampMixin, UUIDPrimaryKeyMixin


class WatchlistEntry(Base, UUIDPrimaryKeyMixin, TimestampMixin):
    __tablename__ = "watchlist_entries"
    __table_args__ = (
        UniqueConstraint("user_id", "entity_type", "entity_id"),
        Index("ix_watchlist_entries_user", "user_id", "entity_type"),
    )

    user_id: Mapped[uuid.UUID] = mapped_column(
        ForeignKey("users.id", ondelete="CASCADE"), nullable=False
    )
    entity_type: Mapped[str] = mapped_column(String(30), nullable=False)
    entity_id: Mapped[uuid.UUID] = mapped_column(nullable=False)


__all__ = ["WatchlistEntry"]