import uuid
from datetime import datetime
from typing import TYPE_CHECKING

from sqlalchemy import BigInteger, DateTime, ForeignKey, String
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column, relationship

from .base import Base

if TYPE_CHECKING:
    from .lottery import Lottery
    from .user import User
    from .prize import Prize


class Winner(Base):
    __tablename__ = "winners"
    __table_args__ = ()

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    lottery_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), ForeignKey("lotteries.id", ondelete="CASCADE")
    )
    user_id: Mapped[int] = mapped_column(BigInteger, ForeignKey("users.id"))
    prize_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("prizes.id", ondelete="SET NULL"), nullable=True
    )
    prize_name: Mapped[str] = mapped_column(String(255))  # snapshot at draw time
    drawn_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)

    lottery: Mapped["Lottery"] = relationship("Lottery", back_populates="winners")
    user: Mapped["User"] = relationship("User")
    prize: Mapped["Prize | None"] = relationship("Prize")