from __future__ import annotations

from datetime import datetime, timezone

from sqlalchemy import (
    DateTime,
    Enum as SAEnum,
    ForeignKey,
    String,
    Text,
    func,
)
from sqlalchemy.orm import Mapped, mapped_column

from .base import Base, NotificationChannel, NotificationStatus


class Notification(Base):
    """A record of one notification send attempt (spec §7.8, §10)."""

    __tablename__ = "notifications"

    id: Mapped[int] = mapped_column(primary_key=True)
    user_id: Mapped[int | None] = mapped_column(ForeignKey("users.id"), nullable=True)
    case_id: Mapped[int | None] = mapped_column(ForeignKey("cases.id"), nullable=True)
    match_id: Mapped[int | None] = mapped_column(ForeignKey("matches.id"), nullable=True)
    channel: Mapped[NotificationChannel] = mapped_column(
        SAEnum(NotificationChannel, native_enum=False)
    )
    status: Mapped[NotificationStatus] = mapped_column(
        SAEnum(NotificationStatus, native_enum=False), default=NotificationStatus.queued
    )
    to_address: Mapped[str | None] = mapped_column(String(255), nullable=True)
    payload: Mapped[str] = mapped_column(Text, default="")
    sent_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True), nullable=True
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=lambda: datetime.now(timezone.utc),
        server_default=func.now(),
    )