from datetime import datetime
from typing import Optional

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

from .base import Base


class Alert(Base):
    __tablename__ = "alerts"

    id: Mapped[int] = mapped_column(Integer(), autoincrement=True, primary_key=True)
    device_id: Mapped[int] = mapped_column(
        Integer(), ForeignKey("devices.id", ondelete="CASCADE"), nullable=False, index=True
    )
    # "open" | "acknowledged" | "resolved"
    status: Mapped[str] = mapped_column(String(20), nullable=False, default="open")
    message: Mapped[str] = mapped_column(Text(), nullable=False)

    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
    acknowledged_at: Mapped[Optional[datetime]] = mapped_column(
        DateTime(timezone=True), nullable=True
    )
    acknowledged_by: Mapped[Optional[int]] = mapped_column(
        Integer(), ForeignKey("users.id", ondelete="SET NULL"), nullable=True
    )
    resolved_at: Mapped[Optional[datetime]] = mapped_column(
        DateTime(timezone=True), nullable=True
    )

    device: Mapped["Device"] = relationship("Device")
    acknowledger: Mapped[Optional["User"]] = relationship(
        "User", foreign_keys=[acknowledged_by]
    )