import uuid
from datetime import datetime
from typing import TYPE_CHECKING

from sqlalchemy import BigInteger, DateTime, ForeignKey, UniqueConstraint
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


class Participant(Base):
    __tablename__ = "participants"
    __table_args__ = (UniqueConstraint("lottery_id", "user_id"),)

    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"))
    joined_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)

    lottery: Mapped["Lottery"] = relationship("Lottery", back_populates="participants")
    user: Mapped["User"] = relationship("User")