"""Tests de Alarm (instancia activa)."""

from __future__ import annotations

from datetime import UTC, datetime, timedelta

import pytest
from pydantic import ValidationError

from vmssailor.core import Alarm
from vmssailor.core.enums import AlarmPriority, AlarmState


def _now() -> datetime:
    return datetime.now(UTC)


def test_alarm_active_basic() -> None:
    a = Alarm(
        id="alm_1",
        tag_id="ME_PORT.OIL_PRESS",
        alarm_config_id="ME_PORT.OIL_PRESS.LOW",
        priority=AlarmPriority.EMERGENCY,
        state=AlarmState.ACTIVE,
        timestamp_active=_now(),
        message="Oil pressure low",
    )
    assert a.state == AlarmState.ACTIVE
    assert a.timestamp_ack is None


def test_alarm_ack_requires_timestamp_ack() -> None:
    with pytest.raises(ValidationError):
        Alarm(
            id="a",
            tag_id="t",
            alarm_config_id="t.low",
            priority=AlarmPriority.HIGH,
            state=AlarmState.ACK,
            timestamp_active=_now(),
            # timestamp_ack faltante
        )


def test_alarm_cleared_requires_timestamp_cleared() -> None:
    with pytest.raises(ValidationError):
        Alarm(
            id="a",
            tag_id="t",
            alarm_config_id="t.low",
            priority=AlarmPriority.HIGH,
            state=AlarmState.CLEARED,
            timestamp_active=_now(),
        )


def test_alarm_ack_timestamp_must_be_after_active() -> None:
    t0 = _now()
    with pytest.raises(ValidationError):
        Alarm(
            id="a",
            tag_id="t",
            alarm_config_id="t.low",
            priority=AlarmPriority.HIGH,
            state=AlarmState.ACK,
            timestamp_active=t0,
            timestamp_ack=t0 - timedelta(seconds=1),
            acknowledged_by="op1",
        )


def test_alarm_acknowledged_by_without_ts_inconsistent() -> None:
    with pytest.raises(ValidationError):
        Alarm(
            id="a",
            tag_id="t",
            alarm_config_id="t.low",
            priority=AlarmPriority.HIGH,
            state=AlarmState.ACTIVE,
            timestamp_active=_now(),
            acknowledged_by="op1",
        )