"""How long a monitor has been in its state (#5120). The Status page that
first showed it was folded into Monitors (#5270)."""
from datetime import datetime, timedelta, timezone
from types import SimpleNamespace

import pytest

from steward.core.status import streak_start

T0 = datetime(2026, 10, 6, 18, 0, tzinfo=timezone.utc)


def _checks(*ups):
    return [SimpleNamespace(is_up=up, checked_at=T0 + timedelta(minutes=i)) for i, up in enumerate(ups)]


@pytest.mark.parametrize("ups, since, at_least", [
    ((), None, False),
    ((True,), 0, True),
    ((False, False, False), 0, True),         # down for every check we have
    ((True, True, False, False), 2, False),   # went down at the third check
    ((False, True, True, False), 3, False),
])
def test_streak_start(ups, since, at_least):
    checks = _checks(*ups)
    assert streak_start(checks) == ((checks[since].checked_at if since is not None else None), at_least)