from __future__ import annotations

import uuid
from datetime import datetime

from sqlalchemy import DateTime, Enum, ForeignKey, Integer, String, Text
from sqlalchemy.orm import Mapped, mapped_column

from app.db.base import Base, TimestampMixin, UUIDPrimaryKeyMixin
from app.models.enums import NotificationDeliveryStatus


class NotificationDelivery(Base, UUIDPrimaryKeyMixin, TimestampMixin):
    __tablename__ = "notification_deliveries"

    alert_id: Mapped[uuid.UUID] = mapped_column(
        ForeignKey("alerts.id", ondelete="CASCADE"), index=True
    )
    destination_id: Mapped[uuid.UUID] = mapped_column(
        ForeignKey("notification_destinations.id", ondelete="CASCADE"), index=True
    )
    provider: Mapped[str] = mapped_column(String(50))
    status: Mapped[NotificationDeliveryStatus] = mapped_column(
        Enum(NotificationDeliveryStatus, native_enum=False, length=20),
        default=NotificationDeliveryStatus.PENDING,
    )
    attempt_count: Mapped[int] = mapped_column(Integer, default=0)
    last_attempt: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    external_message_id: Mapped[str | None] = mapped_column(String(255), nullable=True)
    error_message: Mapped[str | None] = mapped_column(Text, nullable=True)