"""recreate_holiday_schedules skips past at() expressions, not only EndDate."""

from datetime import datetime, timezone
from zoneinfo import ZoneInfo
import importlib.util
import sys
from pathlib import Path

ROOT = Path(__file__).resolve().parents[2]


def _load():
    spec = importlib.util.spec_from_file_location(
        "recreate_holiday_schedules",
        ROOT / "scripts" / "cutover" / "recreate_holiday_schedules.py",
    )
    mod = importlib.util.module_from_spec(spec)
    sys.modules["recreate_holiday_schedules"] = mod
    spec.loader.exec_module(mod)
    return mod


mod = _load()


def test_schedule_when_parses_at_expression_in_eastern():
    detail = {
        "ScheduleExpression": "at(2026-07-04T08:00:00)",
        "ScheduleExpressionTimezone": "America/New_York",
    }
    when = mod.schedule_when(detail)
    expected = datetime(
        2026, 7, 4, 8, 0, 0, tzinfo=ZoneInfo("America/New_York")
    ).astimezone(timezone.utc)
    assert when == expected


def test_past_at_expression_is_before_now_without_end_date():
    detail = {
        "ScheduleExpression": "at(2020-01-01T08:00:00)",
        "ScheduleExpressionTimezone": "America/New_York",
    }
    when = mod.schedule_when(detail)
    assert when is not None
    assert when < datetime.now(timezone.utc)
    assert "EndDate" not in detail
    assert "StartDate" not in detail


def test_future_at_expression_is_kept():
    detail = {
        "ScheduleExpression": "at(2099-12-25T17:00:00)",
        "ScheduleExpressionTimezone": "America/New_York",
    }
    when = mod.schedule_when(detail)
    assert when is not None
    assert when > datetime.now(timezone.utc)