import uuid
from datetime import datetime

from sqlalchemy import ForeignKey, String, Text, UniqueConstraint, func
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column

from app.db import Base


class Game(Base):
    __tablename__ = "games"

    id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    name: Mapped[str] = mapped_column(String(length=200), nullable=False)
    description: Mapped[str] = mapped_column(Text, nullable=False, default="")
    creator_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), ForeignKey("users.id"), nullable=False
    )
    participation_code: Mapped[str] = mapped_column(
        String(length=16), unique=True, nullable=False, index=True
    )
    created_at: Mapped[datetime] = mapped_column(
        server_default=func.now(), nullable=False, index=True
    )


class GameParticipant(Base):
    __tablename__ = "game_participants"
    __table_args__ = (UniqueConstraint("game_id", "user_id", name="uq_game_participant"),)

    id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    game_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), ForeignKey("games.id", ondelete="CASCADE"), nullable=False, index=True
    )
    user_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), ForeignKey("users.id"), nullable=False
    )
    character_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("characters.id"), nullable=True
    )
    joined_at: Mapped[datetime] = mapped_column(server_default=func.now(), nullable=False)