import uuid
from datetime import datetime, timezone

from sqlalchemy import Boolean, DateTime, ForeignKey, Index, String
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.database import Base


def _now() -> datetime:
    return datetime.now(timezone.utc)


class RefreshToken(Base):
    __tablename__ = "refresh_tokens"
    __table_args__ = (Index("idx_refresh_tokens_user_id", "user_id"),)

    id: Mapped[uuid.UUID] = mapped_column(primary_key=True, default=uuid.uuid4)
    user_id: Mapped[uuid.UUID] = mapped_column(
        ForeignKey("users.id", ondelete="CASCADE"), nullable=False
    )
    token_hash: Mapped[str] = mapped_column(String(255), unique=True, nullable=False)
    expires_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
    revoked: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=_now)

    user: Mapped["User"] = relationship(back_populates="refresh_tokens")