from __future__ import annotations

import uuid
from datetime import datetime

from sqlalchemy import Boolean, DateTime, ForeignKey, UniqueConstraint, text
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column

from core.db.base import Base, TimestampMixin


class UserNotification(TimestampMixin, Base):
    __tablename__ = "user_notifications"
    __table_args__ = (
        UniqueConstraint(
            "user_id",
            "notification_id",
            name="uq_user_notifications_user_notification",
        ),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    user_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("auth.users.id", ondelete="CASCADE"),
        nullable=False,
    )
    notification_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("notifications.id", ondelete="CASCADE"),
        nullable=False,
    )
    is_read: Mapped[bool] = mapped_column(
        Boolean, nullable=False, server_default=text("false")
    )
    read_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True), nullable=True
    )