import warnings

import pytest

import pandas as pd
import pandas.util.testing as tm

from .base import BaseExtensionTests


class BaseReduceTests(BaseExtensionTests):
    """
    Reduction specific tests. Generally these only
    make sense for numeric/boolean operations.
    """
    def check_reduce(self, s, op_name, skipna):
        result = getattr(s, op_name)(skipna=skipna)
        expected = getattr(s.astype('float64'), op_name)(skipna=skipna)
        tm.assert_almost_equal(result, expected)


class BaseNoReduceTests(BaseReduceTests):
    """ we don't define any reductions """

    @pytest.mark.parametrize('skipna', [True, False])
    def test_reduce_series_numeric(self, data, all_numeric_reductions, skipna):
        op_name = all_numeric_reductions
        s = pd.Series(data)

        with pytest.raises(TypeError):
            getattr(s, op_name)(skipna=skipna)

    @pytest.mark.parametrize('skipna', [True, False])
    def test_reduce_series_boolean(self, data, all_boolean_reductions, skipna):
        op_name = all_boolean_reductions
        s = pd.Series(data)

        with pytest.raises(TypeError):
            getattr(s, op_name)(skipna=skipna)


class BaseNumericReduceTests(BaseReduceTests):

    @pytest.mark.parametrize('skipna', [True, False])
    def test_reduce_series(self, data, all_numeric_reductions, skipna):
        op_name = all_numeric_reductions
        s = pd.Series(data)

        # min/max with empty produce numpy warnings
        with warnings.catch_warnings():
            warnings.simplefilter("ignore", RuntimeWarning)
            self.check_reduce(s, op_name, skipna)


class BaseBooleanReduceTests(BaseReduceTests):

    @pytest.mark.parametrize('skipna', [True, False])
    def test_reduce_series(self, data, all_boolean_reductions, skipna):
        op_name = all_boolean_reductions
        s = pd.Series(data)
        self.check_reduce(s, op_name, skipna)