import warnings

import numpy as np
import pytest

from pandas.core.indexes.frozen import FrozenList, FrozenNDArray
from pandas.tests.test_base import CheckImmutable, CheckStringMixin
from pandas.util import testing as tm


class TestFrozenList(CheckImmutable, CheckStringMixin):
    mutable_methods = ("extend", "pop", "remove", "insert")
    unicode_container = FrozenList(["\u05d0", "\u05d1", "c"])

    def setup_method(self, _):
        self.lst = [1, 2, 3, 4, 5]
        self.container = FrozenList(self.lst)
        self.klass = FrozenList

    def test_add(self):
        result = self.container + (1, 2, 3)
        expected = FrozenList(self.lst + [1, 2, 3])
        self.check_result(result, expected)

        result = (1, 2, 3) + self.container
        expected = FrozenList([1, 2, 3] + self.lst)
        self.check_result(result, expected)

    def test_iadd(self):
        q = r = self.container

        q += [5]
        self.check_result(q, self.lst + [5])

        # Other shouldn't be mutated.
        self.check_result(r, self.lst)

    def test_union(self):
        result = self.container.union((1, 2, 3))
        expected = FrozenList(self.lst + [1, 2, 3])
        self.check_result(result, expected)

    def test_difference(self):
        result = self.container.difference([2])
        expected = FrozenList([1, 3, 4, 5])
        self.check_result(result, expected)

    def test_difference_dupe(self):
        result = FrozenList([1, 2, 3, 2]).difference([2])
        expected = FrozenList([1, 3])
        self.check_result(result, expected)

    def test_tricky_container_to_bytes_raises(self):
        # GH 26447
        msg = "^'str' object cannot be interpreted as an integer$"
        with pytest.raises(TypeError, match=msg):
            bytes(self.unicode_container)


class TestFrozenNDArray(CheckImmutable, CheckStringMixin):
    mutable_methods = ("put", "itemset", "fill")

    def setup_method(self, _):
        self.lst = [3, 5, 7, -2]
        self.klass = FrozenNDArray

        with warnings.catch_warnings(record=True):
            warnings.simplefilter("ignore", FutureWarning)

            self.container = FrozenNDArray(self.lst)
            self.unicode_container = FrozenNDArray(["\u05d0", "\u05d1", "c"])

    def test_constructor_warns(self):
        # see gh-9031
        with tm.assert_produces_warning(FutureWarning):
            FrozenNDArray([1, 2, 3])

    def test_tricky_container_to_bytes(self):
        bytes(self.unicode_container)

    def test_shallow_copying(self):
        original = self.container.copy()
        assert isinstance(self.container.view(), FrozenNDArray)
        assert not isinstance(self.container.view(np.ndarray), FrozenNDArray)
        assert self.container.view() is not self.container
        tm.assert_numpy_array_equal(self.container, original)

        # Shallow copy should be the same too
        assert isinstance(self.container._shallow_copy(), FrozenNDArray)

        # setting should not be allowed
        def testit(container):
            container[0] = 16

        self.check_mutable_error(testit, self.container)

    def test_values(self):
        original = self.container.view(np.ndarray).copy()
        n = original[0] + 15

        vals = self.container.values()
        tm.assert_numpy_array_equal(original, vals)

        assert original is not vals
        vals[0] = n

        assert isinstance(self.container, FrozenNDArray)
        tm.assert_numpy_array_equal(self.container.values(), original)
        assert vals[0] == n

    def test_searchsorted(self):
        expected = 2
        assert self.container.searchsorted(7) == expected

        with tm.assert_produces_warning(FutureWarning):
            assert self.container.searchsorted(v=7) == expected