from datetime import datetime, timedelta, timezone

import pytest
import time_machine

from freqtrade.util import dt_from_ts, dt_now


def test_dt_now():
    with time_machine.travel("2021-09-01 05:01:00 +00:00", tick=False) as t:
        now = datetime.now(timezone.utc)
        assert dt_now() == now

        t.shift(timedelta(hours=5))
        assert dt_now() >= now
        assert dt_now() == datetime.now(timezone.utc)


@pytest.mark.parametrize('as_ms', [True, False])
def test_dt_from_ts(as_ms):
    multi = 1000 if as_ms else 1
    assert dt_from_ts(1683244800.0 * multi) == datetime(2023, 5, 5, tzinfo=timezone.utc)
    assert dt_from_ts(1683244800.5555 * multi) == datetime(2023, 5, 5, 0, 0, 0, 555500,
                                                           tzinfo=timezone.utc)
    # As int
    assert dt_from_ts(1683244800 * multi) == datetime(2023, 5, 5, tzinfo=timezone.utc)
    # As milliseconds
    assert dt_from_ts(1683244800 * multi) == datetime(2023, 5, 5, tzinfo=timezone.utc)
    assert dt_from_ts(1683242400 * multi) == datetime(2023, 5, 4, 23, 20, tzinfo=timezone.utc)