"""Television model: Series -> Seasons -> Episodes (section 5)."""

from __future__ import annotations

import uuid
from datetime import date

from sqlalchemy import Date, ForeignKey, Integer, String, Text, UniqueConstraint
from sqlalchemy.orm import Mapped, mapped_column

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


class Series(Base, UUIDPrimaryKeyMixin, TimestampMixin):
    __tablename__ = "series"

    title: Mapped[str] = mapped_column(String(500), nullable=False, index=True)
    original_title: Mapped[str | None] = mapped_column(String(500), nullable=True)
    sort_title: Mapped[str] = mapped_column(String(500), nullable=False, index=True)

    overview: Mapped[str | None] = mapped_column(Text, nullable=True)
    tagline: Mapped[str | None] = mapped_column(Text, nullable=True)

    status: Mapped[SeriesStatus] = mapped_column(
        default=SeriesStatus.RETURNING_SERIES, nullable=False
    )
    original_language_code: Mapped[str | None] = mapped_column(
        ForeignKey("languages.code"), nullable=True
    )
    first_air_date: Mapped[date | None] = mapped_column(Date, nullable=True, index=True)
    last_air_date: Mapped[date | None] = mapped_column(Date, nullable=True)

    number_of_seasons: Mapped[int | None] = mapped_column(Integer, nullable=True)
    number_of_episodes: Mapped[int | None] = mapped_column(Integer, nullable=True)

    popularity: Mapped[float | None] = mapped_column(nullable=True)
    vote_average: Mapped[float | None] = mapped_column(nullable=True)
    vote_count: Mapped[int | None] = mapped_column(Integer, nullable=True)

    source_provider_id: Mapped[uuid.UUID | None] = mapped_column(
        ForeignKey("providers.id", ondelete="SET NULL"), nullable=True
    )


class SeriesAlternateTitle(Base, UUIDPrimaryKeyMixin):
    __tablename__ = "series_alternate_titles"

    series_id: Mapped[uuid.UUID] = mapped_column(
        ForeignKey("series.id", ondelete="CASCADE"), nullable=False, index=True
    )
    title: Mapped[str] = mapped_column(String(500), nullable=False)
    country_code: Mapped[str | None] = mapped_column(ForeignKey("countries.code"), nullable=True)
    type: Mapped[str | None] = mapped_column(String(50), nullable=True)


class SeriesSpokenLanguage(Base):
    __tablename__ = "series_spoken_languages"

    series_id: Mapped[uuid.UUID] = mapped_column(
        ForeignKey("series.id", ondelete="CASCADE"), primary_key=True
    )
    language_code: Mapped[str] = mapped_column(ForeignKey("languages.code"), primary_key=True)


class SeriesProductionCountry(Base):
    __tablename__ = "series_production_countries"

    series_id: Mapped[uuid.UUID] = mapped_column(
        ForeignKey("series.id", ondelete="CASCADE"), primary_key=True
    )
    country_code: Mapped[str] = mapped_column(ForeignKey("countries.code"), primary_key=True)


class Season(Base, UUIDPrimaryKeyMixin, TimestampMixin):
    __tablename__ = "seasons"
    __table_args__ = (UniqueConstraint("series_id", "season_number", name="uq_season_number"),)

    series_id: Mapped[uuid.UUID] = mapped_column(
        ForeignKey("series.id", ondelete="CASCADE"), nullable=False, index=True
    )
    season_number: Mapped[int] = mapped_column(Integer, nullable=False)
    title: Mapped[str | None] = mapped_column(String(500), nullable=True)
    overview: Mapped[str | None] = mapped_column(Text, nullable=True)
    air_date: Mapped[date | None] = mapped_column(Date, nullable=True)
    episode_count: Mapped[int | None] = mapped_column(Integer, nullable=True)


class Episode(Base, UUIDPrimaryKeyMixin, TimestampMixin):
    __tablename__ = "episodes"
    __table_args__ = (
        UniqueConstraint("season_id", "episode_number", name="uq_episode_number"),
    )

    season_id: Mapped[uuid.UUID] = mapped_column(
        ForeignKey("seasons.id", ondelete="CASCADE"), nullable=False, index=True
    )
    # Denormalized for direct filtering/joins without hopping through seasons.
    series_id: Mapped[uuid.UUID] = mapped_column(
        ForeignKey("series.id", ondelete="CASCADE"), nullable=False, index=True
    )
    season_number: Mapped[int] = mapped_column(Integer, nullable=False)
    episode_number: Mapped[int] = mapped_column(Integer, nullable=False)

    title: Mapped[str | None] = mapped_column(String(500), nullable=True)
    overview: Mapped[str | None] = mapped_column(Text, nullable=True)
    air_date: Mapped[date | None] = mapped_column(Date, nullable=True)
    runtime_minutes: Mapped[int | None] = mapped_column(Integer, nullable=True)


__all__ = [
    "Series",
    "SeriesAlternateTitle",
    "SeriesSpokenLanguage",
    "SeriesProductionCountry",
    "Season",
    "Episode",
]