import datetime

import numpy as np
import pytest

from pandas import (
    DataFrame,
    DatetimeIndex,
    Series,
    _testing as tm,
    date_range,
    period_range,
)

pytestmark = pytest.mark.single_cpu


@pytest.mark.parametrize("unit", ["us", "ns"])
def test_store_datetime_fractional_secs(temp_hdfstore, unit):
    dt = datetime.datetime(2012, 1, 2, 3, 4, 5, 123456)
    dti = DatetimeIndex([dt], dtype=f"M8[{unit}]")
    series = Series([0], index=dti)
    temp_hdfstore["a"] = series
    assert temp_hdfstore["a"].index[0] == dt


@pytest.mark.filterwarnings(r"ignore:PeriodDtype\[B\] is deprecated:FutureWarning")
def test_tseries_indices_series(temp_hdfstore):
    idx = date_range("2020-01-01", periods=10)
    ser = Series(np.random.default_rng(2).standard_normal(len(idx)), idx)
    temp_hdfstore["a"] = ser
    result = temp_hdfstore["a"]

    tm.assert_series_equal(result, ser)
    assert result.index.freq == ser.index.freq
    tm.assert_class_equal(result.index, ser.index, obj="series index")

    idx = period_range("2020-01-01", periods=10, freq="D")
    ser = Series(np.random.default_rng(2).standard_normal(len(idx)), idx)
    temp_hdfstore["a"] = ser
    result = temp_hdfstore["a"]

    tm.assert_series_equal(result, ser)
    assert result.index.freq == ser.index.freq
    tm.assert_class_equal(result.index, ser.index, obj="series index")


@pytest.mark.filterwarnings(r"ignore:PeriodDtype\[B\] is deprecated:FutureWarning")
def test_tseries_indices_frame(temp_hdfstore):
    idx = date_range("2020-01-01", periods=10)
    df = DataFrame(np.random.default_rng(2).standard_normal((len(idx), 3)), index=idx)
    temp_hdfstore["a"] = df
    result = temp_hdfstore["a"]

    tm.assert_frame_equal(result, df)
    assert result.index.freq == df.index.freq
    tm.assert_class_equal(result.index, df.index, obj="dataframe index")

    idx = period_range("2020-01-01", periods=10, freq="D")
    df = DataFrame(np.random.default_rng(2).standard_normal((len(idx), 3)), idx)
    temp_hdfstore["a"] = df
    result = temp_hdfstore["a"]

    tm.assert_frame_equal(result, df)
    assert result.index.freq == df.index.freq
    tm.assert_class_equal(result.index, df.index, obj="dataframe index")