"""ACTIVITY-WP-0014 T03: missed-fire detection verdict tests."""

from __future__ import annotations

from datetime import datetime, timedelta, timezone

from activity_core.schedule_health import evaluate_schedule_health

NOW = datetime(2026, 6, 23, 12, 0, tzinfo=timezone.utc)


def test_healthy_when_recent_fire_and_no_drops() -> None:
    health = evaluate_schedule_health(
        activity_id="a1",
        missed_catchup_window=0,
        last_fired_at=NOW - timedelta(minutes=5),
        now=NOW,
        expected_interval=timedelta(hours=1),
    )
    assert health.healthy is True
    assert health.missed is False
    assert health.reasons == []


def test_unhealthy_when_catchup_window_dropped_fires() -> None:
    health = evaluate_schedule_health(
        activity_id="a1",
        missed_catchup_window=2,
        last_fired_at=NOW - timedelta(minutes=5),
        now=NOW,
    )
    assert health.missed is True
    assert "2 fire(s) dropped" in health.reasons[0]


def test_unhealthy_when_last_fire_too_stale() -> None:
    health = evaluate_schedule_health(
        activity_id="daily",
        missed_catchup_window=0,
        last_fired_at=NOW - timedelta(days=2),
        now=NOW,
        expected_interval=timedelta(days=1),
    )
    assert health.missed is True
    assert any("exceeding the expected" in r for r in health.reasons)
    assert health.staleness == timedelta(days=2)


def test_within_tolerance_is_healthy() -> None:
    health = evaluate_schedule_health(
        activity_id="daily",
        missed_catchup_window=0,
        last_fired_at=NOW - (timedelta(days=1) + timedelta(minutes=5)),
        now=NOW,
        expected_interval=timedelta(days=1),
        tolerance=timedelta(minutes=10),
    )
    assert health.healthy is True


def test_no_fire_recorded_for_due_schedule_is_unhealthy() -> None:
    health = evaluate_schedule_health(
        activity_id="daily",
        missed_catchup_window=0,
        last_fired_at=None,
        now=NOW,
        expected_interval=timedelta(days=1),
    )
    assert health.missed is True
    assert "no recorded fire" in health.reasons[0]


def test_no_interval_and_no_fire_is_not_flagged() -> None:
    # Without an expected interval we cannot assert a miss from absence alone.
    health = evaluate_schedule_health(
        activity_id="event-ish",
        missed_catchup_window=0,
        last_fired_at=None,
        now=NOW,
    )
    assert health.healthy is True