"""Unit tests for the schedule due-check (pure, no DB)."""
from datetime import datetime, timedelta, timezone
from types import SimpleNamespace

from steward.ansible.scheduler import due_slot, is_due

NOW = datetime(2026, 6, 16, 12, 0, 0, tzinfo=timezone.utc)


def _sched(enabled=True, last=None, interval=3600):
    return SimpleNamespace(enabled=enabled, last_run_at=last, interval_seconds=interval)


def test_never_run_is_due():
    assert is_due(_sched(last=None), NOW) is True


def test_disabled_is_never_due():
    assert is_due(_sched(enabled=False, last=None), NOW) is False


def test_due_when_interval_elapsed():
    assert is_due(_sched(last=NOW - timedelta(seconds=3600), interval=3600), NOW) is True
    assert is_due(_sched(last=NOW - timedelta(seconds=3700), interval=3600), NOW) is True


def test_not_due_before_interval():
    assert is_due(_sched(last=NOW - timedelta(seconds=1800), interval=3600), NOW) is False


def test_a_daily_schedule_holds_its_time_of_day():
    """#5432: noticed 40 s late every day, a daily run still belongs to its
    05:44:45 slot, so the lateness never adds up."""
    day = 86400
    last = datetime(2026, 10, 2, 5, 44, 45, tzinfo=timezone.utc)
    for _ in range(6):
        noticed = last + timedelta(seconds=day + 40)
        assert is_due(_sched(last=last, interval=day), noticed)
        last = due_slot(_sched(last=last, interval=day), noticed)
    assert last == datetime(2026, 10, 8, 5, 44, 45, tzinfo=timezone.utc)


def test_missed_slots_are_skipped_not_run_in_a_burst():
    last = NOW - timedelta(hours=5, minutes=10)
    slot = due_slot(_sched(last=last, interval=3600), NOW)
    assert slot == NOW - timedelta(minutes=10)
    assert not is_due(_sched(last=slot, interval=3600), NOW)


def test_a_first_run_is_its_own_slot():
    assert due_slot(_sched(last=None), NOW) == NOW