"""
This file contains a minimal set of tests for compliance with the extension
array interface test suite, and should contain no other tests.
The test suite for the full functionality of the array is located in
`pandas/tests/arrays/`.

The tests in this file are inherited from the BaseExtensionTests, and only
minimal tweaks should be applied to get the tests passing (by overwriting a
parent method).

Additional tests should either be added to one of the BaseExtensionTests
classes (if they are relevant for the extension interface for all dtypes), or
be added to the array-specific tests in `pandas/tests/arrays/`.

"""
import numpy as np
import pytest

import pandas as pd
import pandas._testing as tm
from pandas.api.types import (
    is_extension_array_dtype,
    is_integer_dtype,
)
from pandas.core.arrays.integer import (
    Int8Dtype,
    Int16Dtype,
    Int32Dtype,
    Int64Dtype,
    UInt8Dtype,
    UInt16Dtype,
    UInt32Dtype,
    UInt64Dtype,
)
from pandas.tests.extension import base


def make_data():
    return list(range(1, 9)) + [pd.NA] + list(range(10, 98)) + [pd.NA] + [99, 100]


@pytest.fixture(
    params=[
        Int8Dtype,
        Int16Dtype,
        Int32Dtype,
        Int64Dtype,
        UInt8Dtype,
        UInt16Dtype,
        UInt32Dtype,
        UInt64Dtype,
    ]
)
def dtype(request):
    return request.param()


@pytest.fixture
def data(dtype):
    return pd.array(make_data(), dtype=dtype)


@pytest.fixture
def data_for_twos(dtype):
    return pd.array(np.ones(100) * 2, dtype=dtype)


@pytest.fixture
def data_missing(dtype):
    return pd.array([pd.NA, 1], dtype=dtype)


@pytest.fixture
def data_for_sorting(dtype):
    return pd.array([1, 2, 0], dtype=dtype)


@pytest.fixture
def data_missing_for_sorting(dtype):
    return pd.array([1, pd.NA, 0], dtype=dtype)


@pytest.fixture
def na_cmp():
    # we are pd.NA
    return lambda x, y: x is pd.NA and y is pd.NA


@pytest.fixture
def na_value():
    return pd.NA


@pytest.fixture
def data_for_grouping(dtype):
    b = 1
    a = 0
    c = 2
    na = pd.NA
    return pd.array([b, b, na, na, a, a, b, c], dtype=dtype)


class TestDtype(base.BaseDtypeTests):
    pass


class TestArithmeticOps(base.BaseArithmeticOpsTests):
    def check_opname(self, s, op_name, other, exc=None):
        # overwriting to indicate ops don't raise an error
        super().check_opname(s, op_name, other, exc=None)

    def _check_op(self, s, op, other, op_name, exc=NotImplementedError):
        if exc is None:
            sdtype = tm.get_dtype(s)

            if (
                hasattr(other, "dtype")
                and not is_extension_array_dtype(other.dtype)
                and is_integer_dtype(other.dtype)
                and sdtype.is_unsigned_integer
            ):
                # TODO: comment below is inaccurate; other can be int8, int16, ...
                #  and the trouble is that e.g. if s is UInt8 and other is int8,
                #  then result is UInt16
                # other is np.int64 and would therefore always result in
                # upcasting, so keeping other as same numpy_dtype
                other = other.astype(sdtype.numpy_dtype)

            result = op(s, other)
            expected = self._combine(s, other, op)

            if op_name in ("__rtruediv__", "__truediv__", "__div__"):
                expected = expected.fillna(np.nan).astype("Float64")
            else:
                # combine method result in 'biggest' (int64) dtype
                expected = expected.astype(sdtype)

            self.assert_equal(result, expected)
        else:
            with pytest.raises(exc):
                op(s, other)

    def _check_divmod_op(self, s, op, other, exc=None):
        super()._check_divmod_op(s, op, other, None)


class TestComparisonOps(base.BaseComparisonOpsTests):
    def _check_op(self, s, op, other, op_name, exc=NotImplementedError):
        if exc is None:
            result = op(s, other)
            # Override to do the astype to boolean
            expected = s.combine(other, op).astype("boolean")
            self.assert_series_equal(result, expected)
        else:
            with pytest.raises(exc):
                op(s, other)

    def check_opname(self, s, op_name, other, exc=None):
        super().check_opname(s, op_name, other, exc=None)

    def _compare_other(self, s, data, op, other):
        op_name = f"__{op.__name__}__"
        self.check_opname(s, op_name, other)


class TestInterface(base.BaseInterfaceTests):
    pass


class TestConstructors(base.BaseConstructorsTests):
    pass


class TestReshaping(base.BaseReshapingTests):
    pass

    # for test_concat_mixed_dtypes test
    # concat of an Integer and Int coerces to object dtype
    # TODO(jreback) once integrated this would


class TestGetitem(base.BaseGetitemTests):
    pass


class TestSetitem(base.BaseSetitemTests):
    pass


class TestIndex(base.BaseIndexTests):
    pass


class TestMissing(base.BaseMissingTests):
    pass


class TestMethods(base.BaseMethodsTests):
    @pytest.mark.parametrize("dropna", [True, False])
    def test_value_counts(self, all_data, dropna):
        all_data = all_data[:10]
        if dropna:
            other = np.array(all_data[~all_data.isna()])
        else:
            other = all_data

        result = pd.Series(all_data).value_counts(dropna=dropna).sort_index()
        expected = pd.Series(other).value_counts(dropna=dropna).sort_index()
        expected = expected.astype("Int64")
        expected.index = expected.index.astype(all_data.dtype)

        self.assert_series_equal(result, expected)

    @pytest.mark.xfail(reason="uses nullable integer")
    def test_value_counts_with_normalize(self, data):
        super().test_value_counts_with_normalize(data)


class TestCasting(base.BaseCastingTests):
    pass


class TestGroupby(base.BaseGroupbyTests):
    pass


class TestNumericReduce(base.BaseNumericReduceTests):
    def check_reduce(self, s, op_name, skipna):
        # overwrite to ensure pd.NA is tested instead of np.nan
        # https://github.com/pandas-dev/pandas/issues/30958
        result = getattr(s, op_name)(skipna=skipna)
        if not skipna and s.isna().any():
            expected = pd.NA
        else:
            expected = getattr(s.dropna().astype("int64"), op_name)(skipna=skipna)
        tm.assert_almost_equal(result, expected)


@pytest.mark.skip(reason="Tested in tests/reductions/test_reductions.py")
class TestBooleanReduce(base.BaseBooleanReduceTests):
    pass


class TestPrinting(base.BasePrintingTests):
    pass


class TestParsing(base.BaseParsingTests):
    pass


class Test2DCompat(base.Dim2CompatTests):
    pass
