from __future__ import annotations

from datetime import UTC, datetime

import pytest
from backup_tool.scheduler import ScheduleError, next_nominal


def test_five_field_cron_returns_utc_nominal_time() -> None:
    result = next_nominal("0 9 * * *", "America/New_York", datetime(2026, 1, 1, tzinfo=UTC))
    assert result.tzinfo is UTC
    assert result.hour == 14


@pytest.mark.parametrize(("cron", "timezone"), [("* * * * * *", "UTC"), ("* * * * *", "Nope/Zone")])
def test_invalid_cron_or_timezone_is_rejected(cron: str, timezone: str) -> None:
    with pytest.raises(ScheduleError):
        next_nominal(cron, timezone)