"""Tests util.inspect functions."""

from __future__ import annotations

import ast
import datetime
import enum
import functools
import sys
import types
from inspect import Parameter
from typing import Callable, List, Optional, Union  # NoQA: UP035

import pytest

from sphinx.util import inspect
from sphinx.util.inspect import TypeAliasForwardRef, TypeAliasNamespace, stringify_signature
from sphinx.util.typing import stringify_annotation


class Base:
    def meth(self):
        pass

    @staticmethod
    def staticmeth():
        pass

    @classmethod
    def classmeth(cls):
        pass

    @property
    def prop(self):
        pass

    partialmeth = functools.partialmethod(meth)

    async def coroutinemeth(self):
        pass

    partial_coroutinemeth = functools.partialmethod(coroutinemeth)

    @classmethod
    async def coroutineclassmeth(cls):
        """A documented coroutine classmethod"""
        pass


class Inherited(Base):
    pass


def func():
    pass


async def coroutinefunc():
    pass


async def asyncgenerator():
    yield


partial_func = functools.partial(func)
partial_coroutinefunc = functools.partial(coroutinefunc)

builtin_func = print
partial_builtin_func = functools.partial(print)


class Descriptor:
    def __get__(self, obj, typ=None):
        pass


class _Callable:
    def __call__(self):
        pass


def _decorator(f):
    @functools.wraps(f)
    def wrapper():
        return f()
    return wrapper


def test_TypeAliasForwardRef():
    alias = TypeAliasForwardRef('example')
    assert stringify_annotation(alias, 'fully-qualified-except-typing') == 'example'

    alias = Optional[alias]
    assert stringify_annotation(alias, 'fully-qualified-except-typing') == 'example | None'


def test_TypeAliasNamespace():
    import logging.config
    type_alias = TypeAliasNamespace({'logging.Filter': 'MyFilter',
                                     'logging.Handler': 'MyHandler',
                                     'logging.handlers.SyslogHandler': 'MySyslogHandler'})

    assert type_alias['logging'].Filter == 'MyFilter'
    assert type_alias['logging'].Handler == 'MyHandler'
    assert type_alias['logging'].handlers.SyslogHandler == 'MySyslogHandler'
    assert type_alias['logging'].Logger == logging.Logger
    assert type_alias['logging'].config == logging.config

    with pytest.raises(KeyError):
        assert type_alias['log']

    with pytest.raises(KeyError):
        assert type_alias['unknown']


def test_signature():
    # literals
    with pytest.raises(TypeError):
        inspect.signature(1)

    with pytest.raises(TypeError):
        inspect.signature('')

    # builtins are supported on a case-by-case basis, depending on whether
    # they define __text_signature__
    if getattr(list, '__text_signature__', None):
        sig = inspect.stringify_signature(inspect.signature(list))
        assert sig == '(iterable=(), /)'
    else:
        with pytest.raises(ValueError, match='no signature found for builtin type'):
            inspect.signature(list)
    with pytest.raises(ValueError, match='no signature found for builtin type'):
        inspect.signature(range)

    # normal function
    def func(a, b, c=1, d=2, *e, **f):
        pass

    sig = inspect.stringify_signature(inspect.signature(func))
    assert sig == '(a, b, c=1, d=2, *e, **f)'


def test_signature_partial():
    def fun(a, b, c=1, d=2):
        pass
    p = functools.partial(fun, 10, c=11)

    sig = inspect.signature(p)
    assert stringify_signature(sig) == '(b, *, c=11, d=2)'


def test_signature_methods():
    class Foo:
        def meth1(self, arg1, **kwargs):
            pass

        @classmethod
        def meth2(cls, arg1, *args, **kwargs):
            pass

        @staticmethod
        def meth3(arg1, *args, **kwargs):
            pass

    @functools.wraps(Foo().meth1)
    def wrapped_bound_method(*args, **kwargs):
        pass

    # unbound method
    sig = inspect.signature(Foo.meth1)
    assert stringify_signature(sig) == '(self, arg1, **kwargs)'

    sig = inspect.signature(Foo.meth1, bound_method=True)
    assert stringify_signature(sig) == '(arg1, **kwargs)'

    # bound method
    sig = inspect.signature(Foo().meth1)
    assert stringify_signature(sig) == '(arg1, **kwargs)'

    # class method
    sig = inspect.signature(Foo.meth2)
    assert stringify_signature(sig) == '(arg1, *args, **kwargs)'

    sig = inspect.signature(Foo().meth2)
    assert stringify_signature(sig) == '(arg1, *args, **kwargs)'

    # static method
    sig = inspect.signature(Foo.meth3)
    assert stringify_signature(sig) == '(arg1, *args, **kwargs)'

    sig = inspect.signature(Foo().meth3)
    assert stringify_signature(sig) == '(arg1, *args, **kwargs)'

    # wrapped bound method
    sig = inspect.signature(wrapped_bound_method)
    assert stringify_signature(sig) == '(arg1, **kwargs)'


def test_signature_partialmethod():
    from functools import partialmethod

    class Foo:
        def meth1(self, arg1, arg2, arg3=None, arg4=None):
            pass

        def meth2(self, arg1, arg2):
            pass

        foo = partialmethod(meth1, 1, 2)
        bar = partialmethod(meth1, 1, arg3=3)
        baz = partialmethod(meth2, 1, 2)

    subject = Foo()
    sig = inspect.signature(subject.foo)
    assert stringify_signature(sig) == '(arg3=None, arg4=None)'

    sig = inspect.signature(subject.bar)
    assert stringify_signature(sig) == '(arg2, *, arg3=3, arg4=None)'

    sig = inspect.signature(subject.baz)
    assert stringify_signature(sig) == '()'


def test_signature_annotations():
    import tests.test_util.typing_test_data as mod

    # Class annotations
    sig = inspect.signature(mod.f0)
    assert stringify_signature(sig) == '(x: int, y: numbers.Integral) -> None'

    # Generic types with concrete parameters
    sig = inspect.signature(mod.f1)
    assert stringify_signature(sig) == '(x: list[int]) -> typing.List[int]'

    # TypeVars and generic types with TypeVars
    sig = inspect.signature(mod.f2)
    assert stringify_signature(sig) == ('(x: typing.List[tests.test_util.typing_test_data.T],'
                                        ' y: typing.List[tests.test_util.typing_test_data.T_co],'
                                        ' z: tests.test_util.typing_test_data.T'
                                        ') -> typing.List[tests.test_util.typing_test_data.T_contra]')

    # Union types
    sig = inspect.signature(mod.f3)
    assert stringify_signature(sig) == '(x: str | numbers.Integral) -> None'

    # Quoted annotations
    sig = inspect.signature(mod.f4)
    assert stringify_signature(sig) == '(x: str, y: str) -> None'

    # Keyword-only arguments
    sig = inspect.signature(mod.f5)
    assert stringify_signature(sig) == '(x: int, *, y: str, z: str) -> None'

    # Keyword-only arguments with varargs
    sig = inspect.signature(mod.f6)
    assert stringify_signature(sig) == '(x: int, *args, y: str, z: str) -> None'

    # Space around '=' for defaults
    sig = inspect.signature(mod.f7)
    if sys.version_info[:2] <= (3, 10):
        assert stringify_signature(sig) == '(x: int | None = None, y: dict = {}) -> None'
    else:
        assert stringify_signature(sig) == '(x: int = None, y: dict = {}) -> None'

    # Callable types
    sig = inspect.signature(mod.f8)
    assert stringify_signature(sig) == '(x: typing.Callable[[int, str], int]) -> None'

    sig = inspect.signature(mod.f9)
    assert stringify_signature(sig) == '(x: typing.Callable) -> None'

    # Tuple types
    sig = inspect.signature(mod.f10)
    assert stringify_signature(sig) == '(x: typing.Tuple[int, str], y: typing.Tuple[int, ...]) -> None'

    # Instance annotations
    sig = inspect.signature(mod.f11)
    assert stringify_signature(sig) == '(x: CustomAnnotation, y: 123) -> None'

    # tuple with more than two items
    sig = inspect.signature(mod.f12)
    assert stringify_signature(sig) == '() -> typing.Tuple[int, str, int]'

    # optional
    sig = inspect.signature(mod.f13)
    assert stringify_signature(sig) == '() -> str | None'

    # optional union
    sig = inspect.signature(mod.f20)
    assert stringify_signature(sig) in ('() -> int | str | None',
                                        '() -> str | int | None')

    # Any
    sig = inspect.signature(mod.f14)
    assert stringify_signature(sig) == '() -> typing.Any'

    # ForwardRef
    sig = inspect.signature(mod.f15)
    assert stringify_signature(sig) == '(x: Unknown, y: int) -> typing.Any'

    # keyword only arguments (1)
    sig = inspect.signature(mod.f16)
    assert stringify_signature(sig) == '(arg1, arg2, *, arg3=None, arg4=None)'

    # keyword only arguments (2)
    sig = inspect.signature(mod.f17)
    assert stringify_signature(sig) == '(*, arg3, arg4)'

    sig = inspect.signature(mod.f18)
    assert stringify_signature(sig) == ('(self, arg1: int | typing.Tuple = 10) -> '
                                        'typing.List[typing.Dict]')

    # annotations for variadic and keyword parameters
    sig = inspect.signature(mod.f19)
    assert stringify_signature(sig) == '(*args: int, **kwargs: str)'

    # default value is inspect.Signature.empty
    sig = inspect.signature(mod.f21)
    assert stringify_signature(sig) == "(arg1='whatever', arg2)"

    # type hints by string
    sig = inspect.signature(mod.Node.children)
    assert stringify_signature(sig) == '(self) -> typing.List[tests.test_util.typing_test_data.Node]'

    sig = inspect.signature(mod.Node.__init__)
    assert stringify_signature(sig) == '(self, parent: tests.test_util.typing_test_data.Node | None) -> None'

    # show_annotation is False
    sig = inspect.signature(mod.f7)
    assert stringify_signature(sig, show_annotation=False) == '(x=None, y={})'

    # show_return_annotation is False
    sig = inspect.signature(mod.f7)
    if sys.version_info[:2] <= (3, 10):
        assert stringify_signature(sig, show_return_annotation=False) == '(x: int | None = None, y: dict = {})'
    else:
        assert stringify_signature(sig, show_return_annotation=False) == '(x: int = None, y: dict = {})'

    # unqualified_typehints is True
    sig = inspect.signature(mod.f7)
    if sys.version_info[:2] <= (3, 10):
        assert stringify_signature(sig, unqualified_typehints=True) == '(x: int | None = None, y: dict = {}) -> None'
    else:
        assert stringify_signature(sig, unqualified_typehints=True) == '(x: int = None, y: dict = {}) -> None'

    # case: separator at head
    sig = inspect.signature(mod.f22)
    assert stringify_signature(sig) == '(*, a, b)'

    # case: separator in the middle
    sig = inspect.signature(mod.f23)
    assert stringify_signature(sig) == '(a, b, /, c, d)'

    sig = inspect.signature(mod.f24)
    assert stringify_signature(sig) == '(a, /, *, b)'

    # case: separator at tail
    sig = inspect.signature(mod.f25)
    assert stringify_signature(sig) == '(a, b, /)'


def test_signature_from_str_basic():
    signature = '(a, b, *args, c=0, d="blah", **kwargs)'
    sig = inspect.signature_from_str(signature)
    assert list(sig.parameters.keys()) == ['a', 'b', 'args', 'c', 'd', 'kwargs']
    assert sig.parameters['a'].name == 'a'
    assert sig.parameters['a'].kind == Parameter.POSITIONAL_OR_KEYWORD
    assert sig.parameters['a'].default == Parameter.empty
    assert sig.parameters['a'].annotation == Parameter.empty
    assert sig.parameters['b'].name == 'b'
    assert sig.parameters['b'].kind == Parameter.POSITIONAL_OR_KEYWORD
    assert sig.parameters['b'].default == Parameter.empty
    assert sig.parameters['b'].annotation == Parameter.empty
    assert sig.parameters['args'].name == 'args'
    assert sig.parameters['args'].kind == Parameter.VAR_POSITIONAL
    assert sig.parameters['args'].default == Parameter.empty
    assert sig.parameters['args'].annotation == Parameter.empty
    assert sig.parameters['c'].name == 'c'
    assert sig.parameters['c'].kind == Parameter.KEYWORD_ONLY
    assert sig.parameters['c'].default == '0'
    assert sig.parameters['c'].annotation == Parameter.empty
    assert sig.parameters['d'].name == 'd'
    assert sig.parameters['d'].kind == Parameter.KEYWORD_ONLY
    assert sig.parameters['d'].default == "'blah'"
    assert sig.parameters['d'].annotation == Parameter.empty
    assert sig.parameters['kwargs'].name == 'kwargs'
    assert sig.parameters['kwargs'].kind == Parameter.VAR_KEYWORD
    assert sig.parameters['kwargs'].default == Parameter.empty
    assert sig.parameters['kwargs'].annotation == Parameter.empty
    assert sig.return_annotation == Parameter.empty


def test_signature_from_str_default_values():
    signature = ('(a=0, b=0.0, c="str", d=b"bytes", e=..., f=True, '
                 'g=[1, 2, 3], h={"a": 1}, i={1, 2, 3}, '
                 'j=lambda x, y: None, k=None, l=object(), m=foo.bar.CONSTANT)')
    sig = inspect.signature_from_str(signature)
    assert sig.parameters['a'].default == '0'
    assert sig.parameters['b'].default == '0.0'
    assert sig.parameters['c'].default == "'str'"
    assert sig.parameters['d'].default == "b'bytes'"
    assert sig.parameters['e'].default == '...'
    assert sig.parameters['f'].default == 'True'
    assert sig.parameters['g'].default == '[1, 2, 3]'
    assert sig.parameters['h'].default == "{'a': 1}"
    assert sig.parameters['i'].default == '{1, 2, 3}'
    assert sig.parameters['j'].default == 'lambda x, y: ...'
    assert sig.parameters['k'].default == 'None'
    assert sig.parameters['l'].default == 'object()'
    assert sig.parameters['m'].default == 'foo.bar.CONSTANT'


def test_signature_from_str_annotations():
    signature = '(a: int, *args: bytes, b: str = "blah", **kwargs: float) -> None'
    sig = inspect.signature_from_str(signature)
    assert list(sig.parameters.keys()) == ['a', 'args', 'b', 'kwargs']
    assert sig.parameters['a'].annotation == "int"
    assert sig.parameters['args'].annotation == "bytes"
    assert sig.parameters['b'].annotation == "str"
    assert sig.parameters['kwargs'].annotation == "float"
    assert sig.return_annotation == 'None'


def test_signature_from_str_complex_annotations():
    sig = inspect.signature_from_str('() -> Tuple[str, int, ...]')
    assert sig.return_annotation == 'Tuple[str, int, ...]'

    sig = inspect.signature_from_str('() -> Callable[[int, int], int]')
    assert sig.return_annotation == 'Callable[[int, int], int]'


def test_signature_from_str_kwonly_args():
    sig = inspect.signature_from_str('(a, *, b)')
    assert list(sig.parameters.keys()) == ['a', 'b']
    assert sig.parameters['a'].kind == Parameter.POSITIONAL_OR_KEYWORD
    assert sig.parameters['a'].default == Parameter.empty
    assert sig.parameters['b'].kind == Parameter.KEYWORD_ONLY
    assert sig.parameters['b'].default == Parameter.empty


def test_signature_from_str_positionaly_only_args():
    sig = inspect.signature_from_str('(a, b=0, /, c=1)')
    assert list(sig.parameters.keys()) == ['a', 'b', 'c']
    assert sig.parameters['a'].kind == Parameter.POSITIONAL_ONLY
    assert sig.parameters['a'].default == Parameter.empty
    assert sig.parameters['b'].kind == Parameter.POSITIONAL_ONLY
    assert sig.parameters['b'].default == '0'
    assert sig.parameters['c'].kind == Parameter.POSITIONAL_OR_KEYWORD
    assert sig.parameters['c'].default == '1'


def test_signature_from_str_invalid():
    with pytest.raises(SyntaxError):
        inspect.signature_from_str('')


def test_signature_from_ast():
    signature = 'def func(a, b, *args, c=0, d="blah", **kwargs): pass'
    tree = ast.parse(signature)
    sig = inspect.signature_from_ast(tree.body[0])
    assert list(sig.parameters.keys()) == ['a', 'b', 'args', 'c', 'd', 'kwargs']
    assert sig.parameters['a'].name == 'a'
    assert sig.parameters['a'].kind == Parameter.POSITIONAL_OR_KEYWORD
    assert sig.parameters['a'].default == Parameter.empty
    assert sig.parameters['a'].annotation == Parameter.empty
    assert sig.parameters['b'].name == 'b'
    assert sig.parameters['b'].kind == Parameter.POSITIONAL_OR_KEYWORD
    assert sig.parameters['b'].default == Parameter.empty
    assert sig.parameters['b'].annotation == Parameter.empty
    assert sig.parameters['args'].name == 'args'
    assert sig.parameters['args'].kind == Parameter.VAR_POSITIONAL
    assert sig.parameters['args'].default == Parameter.empty
    assert sig.parameters['args'].annotation == Parameter.empty
    assert sig.parameters['c'].name == 'c'
    assert sig.parameters['c'].kind == Parameter.KEYWORD_ONLY
    assert sig.parameters['c'].default == '0'
    assert sig.parameters['c'].annotation == Parameter.empty
    assert sig.parameters['d'].name == 'd'
    assert sig.parameters['d'].kind == Parameter.KEYWORD_ONLY
    assert sig.parameters['d'].default == "'blah'"
    assert sig.parameters['d'].annotation == Parameter.empty
    assert sig.parameters['kwargs'].name == 'kwargs'
    assert sig.parameters['kwargs'].kind == Parameter.VAR_KEYWORD
    assert sig.parameters['kwargs'].default == Parameter.empty
    assert sig.parameters['kwargs'].annotation == Parameter.empty
    assert sig.return_annotation == Parameter.empty


def test_safe_getattr_with_default():
    class Foo:
        def __getattr__(self, item):
            raise Exception

    obj = Foo()

    result = inspect.safe_getattr(obj, 'bar', 'baz')

    assert result == 'baz'


def test_safe_getattr_with_exception():
    class Foo:
        def __getattr__(self, item):
            raise Exception

    obj = Foo()

    with pytest.raises(AttributeError, match='bar'):
        inspect.safe_getattr(obj, 'bar')


def test_safe_getattr_with_property_exception():
    class Foo:
        @property
        def bar(self):
            raise Exception

    obj = Foo()

    with pytest.raises(AttributeError, match='bar'):
        inspect.safe_getattr(obj, 'bar')


def test_safe_getattr_with___dict___override():
    class Foo:
        @property
        def __dict__(self):
            raise Exception

    obj = Foo()

    with pytest.raises(AttributeError, match='bar'):
        inspect.safe_getattr(obj, 'bar')


def test_dictionary_sorting():
    dictionary = {"c": 3, "a": 1, "d": 2, "b": 4}
    description = inspect.object_description(dictionary)
    assert description == "{'a': 1, 'b': 4, 'c': 3, 'd': 2}"


def test_set_sorting():
    set_ = set("gfedcba")
    description = inspect.object_description(set_)
    assert description == "{'a', 'b', 'c', 'd', 'e', 'f', 'g'}"


def test_set_sorting_enum():
    class MyEnum(enum.Enum):
        a = 1
        b = 2
        c = 3

    set_ = set(MyEnum)
    description = inspect.object_description(set_)
    assert description == "{MyEnum.a, MyEnum.b, MyEnum.c}"


def test_set_sorting_fallback():
    set_ = {None, 1}
    description = inspect.object_description(set_)
    assert description == "{1, None}"


def test_deterministic_nested_collection_descriptions():
    # sortable
    assert inspect.object_description([{1, 2, 3, 10}]) == "[{1, 2, 3, 10}]"
    assert inspect.object_description(({1, 2, 3, 10},)) == "({1, 2, 3, 10},)"
    # non-sortable (elements of varying datatype)
    assert inspect.object_description([{None, 1}]) == "[{1, None}]"
    assert inspect.object_description(({None, 1},)) == "({1, None},)"
    assert inspect.object_description([{None, 1, 'A'}]) == "[{'A', 1, None}]"
    assert inspect.object_description(({None, 1, 'A'},)) == "({'A', 1, None},)"


def test_frozenset_sorting():
    frozenset_ = frozenset("gfedcba")
    description = inspect.object_description(frozenset_)
    assert description == "frozenset({'a', 'b', 'c', 'd', 'e', 'f', 'g'})"


def test_frozenset_sorting_fallback():
    frozenset_ = frozenset((None, 1))
    description = inspect.object_description(frozenset_)
    assert description == "frozenset({1, None})"


def test_nested_tuple_sorting():
    tuple_ = ({"c", "b", "a"},)  # nb. trailing comma
    description = inspect.object_description(tuple_)
    assert description == "({'a', 'b', 'c'},)"

    tuple_ = ({"c", "b", "a"}, {"f", "e", "d"})
    description = inspect.object_description(tuple_)
    assert description == "({'a', 'b', 'c'}, {'d', 'e', 'f'})"


def test_recursive_collection_description():
    dict_a_, dict_b_ = {"a": 1}, {"b": 2}
    dict_a_["link"], dict_b_["link"] = dict_b_, dict_a_
    description_a, description_b = (
        inspect.object_description(dict_a_),
        inspect.object_description(dict_b_),
    )
    assert description_a == "{'a': 1, 'link': {'b': 2, 'link': dict(...)}}"
    assert description_b == "{'b': 2, 'link': {'a': 1, 'link': dict(...)}}"

    list_c_, list_d_ = [1, 2, 3, 4], [5, 6, 7, 8]
    list_c_.append(list_d_)
    list_d_.append(list_c_)
    description_c, description_d = (
        inspect.object_description(list_c_),
        inspect.object_description(list_d_),
    )

    assert description_c == "[1, 2, 3, 4, [5, 6, 7, 8, list(...)]]"
    assert description_d == "[5, 6, 7, 8, [1, 2, 3, 4, list(...)]]"


def test_dict_customtype():
    class CustomType:
        def __init__(self, value):
            self._value = value

        def __repr__(self):
            return "<CustomType(%r)>" % self._value

    dictionary = {CustomType(2): 2, CustomType(1): 1}
    description = inspect.object_description(dictionary)
    # Type is unsortable, just check that it does not crash
    assert "<CustomType(2)>: 2" in description


def test_object_description_enum():
    class MyEnum(enum.Enum):
        FOO = 1
        BAR = 2

    assert inspect.object_description(MyEnum.FOO) == "MyEnum.FOO"


def test_object_description_enum_custom_repr():
    class MyEnum(enum.Enum):
        FOO = 1
        BAR = 2

        def __repr__(self):
            return self.name

    assert inspect.object_description(MyEnum.FOO) == "FOO"


def test_getslots():
    class Foo:
        pass

    class Bar:
        __slots__ = ['attr']

    class Baz:
        __slots__ = {'attr': 'docstring'}

    class Qux:
        __slots__ = 'attr'

    assert inspect.getslots(Foo) is None
    assert inspect.getslots(Bar) == {'attr': None}
    assert inspect.getslots(Baz) == {'attr': 'docstring'}
    assert inspect.getslots(Qux) == {'attr': None}

    with pytest.raises(TypeError):
        inspect.getslots(Bar())


def test_isclassmethod():
    assert inspect.isclassmethod(Base.classmeth) is True
    assert inspect.isclassmethod(Base.meth) is False
    assert inspect.isclassmethod(Inherited.classmeth) is True
    assert inspect.isclassmethod(Inherited.meth) is False


def test_isstaticmethod():
    assert inspect.isstaticmethod(Base.staticmeth, Base, 'staticmeth') is True
    assert inspect.isstaticmethod(Base.meth, Base, 'meth') is False
    assert inspect.isstaticmethod(Inherited.staticmeth, Inherited, 'staticmeth') is True
    assert inspect.isstaticmethod(Inherited.meth, Inherited, 'meth') is False


def test_iscoroutinefunction():
    assert inspect.iscoroutinefunction(func) is False                   # function
    assert inspect.iscoroutinefunction(coroutinefunc) is True           # coroutine
    assert inspect.iscoroutinefunction(partial_coroutinefunc) is True   # partial-ed coroutine
    assert inspect.iscoroutinefunction(Base.meth) is False              # method
    assert inspect.iscoroutinefunction(Base.coroutinemeth) is True      # coroutine-method
    assert inspect.iscoroutinefunction(Base.__dict__["coroutineclassmeth"]) is True      # coroutine classmethod

    # partial-ed coroutine-method
    partial_coroutinemeth = Base.__dict__['partial_coroutinemeth']
    assert inspect.iscoroutinefunction(partial_coroutinemeth) is True


def test_iscoroutinefunction_wrapped():
    # function wrapping a callable obj
    assert inspect.isfunction(_decorator(coroutinefunc)) is True


def test_isfunction():
    assert inspect.isfunction(func) is True                     # function
    assert inspect.isfunction(partial_func) is True             # partial-ed function
    assert inspect.isfunction(Base.meth) is True                # method of class
    assert inspect.isfunction(Base.partialmeth) is True         # partial-ed method of class
    assert inspect.isfunction(Base().meth) is False             # method of instance
    assert inspect.isfunction(builtin_func) is False            # builtin function
    assert inspect.isfunction(partial_builtin_func) is False    # partial-ed builtin function


def test_isfunction_wrapped():
    # function wrapping a callable obj
    assert inspect.isfunction(_decorator(_Callable())) is True


def test_isbuiltin():
    assert inspect.isbuiltin(builtin_func) is True          # builtin function
    assert inspect.isbuiltin(partial_builtin_func) is True  # partial-ed builtin function
    assert inspect.isbuiltin(func) is False                 # function
    assert inspect.isbuiltin(partial_func) is False         # partial-ed function
    assert inspect.isbuiltin(Base.meth) is False            # method of class
    assert inspect.isbuiltin(Base().meth) is False          # method of instance


def test_isdescriptor():
    assert inspect.isdescriptor(Base.prop) is True      # property of class
    assert inspect.isdescriptor(Base().prop) is False   # property of instance
    assert inspect.isdescriptor(Base.meth) is True      # method of class
    assert inspect.isdescriptor(Base().meth) is True    # method of instance
    assert inspect.isdescriptor(func) is True           # function


def test_isattributedescriptor():
    assert inspect.isattributedescriptor(Base.prop) is True                    # property
    assert inspect.isattributedescriptor(Base.meth) is False                   # method
    assert inspect.isattributedescriptor(Base.staticmeth) is False             # staticmethod
    assert inspect.isattributedescriptor(Base.classmeth) is False              # classmetho
    assert inspect.isattributedescriptor(Descriptor) is False                  # custom descriptor class
    assert inspect.isattributedescriptor(str.join) is False                    # MethodDescriptorType
    assert inspect.isattributedescriptor(object.__init__) is False             # WrapperDescriptorType
    assert inspect.isattributedescriptor(dict.__dict__['fromkeys']) is False   # ClassMethodDescriptorType
    assert inspect.isattributedescriptor(types.FrameType.f_locals) is True     # GetSetDescriptorType
    assert inspect.isattributedescriptor(datetime.timedelta.days) is True      # MemberDescriptorType

    try:
        # _testcapi module cannot be importable in some distro
        # refs: https://github.com/sphinx-doc/sphinx/issues/9868
        import _testcapi

        testinstancemethod = _testcapi.instancemethod(str.__repr__)
        assert inspect.isattributedescriptor(testinstancemethod) is False      # instancemethod (C-API)
    except ImportError:
        pass


def test_isproperty():
    assert inspect.isproperty(Base.prop) is True        # property of class
    assert inspect.isproperty(Base().prop) is False     # property of instance
    assert inspect.isproperty(Base.meth) is False       # method of class
    assert inspect.isproperty(Base().meth) is False     # method of instance
    assert inspect.isproperty(func) is False            # function


def test_isgenericalias():
    #: A list of int
    T = List[int]  # NoQA: UP006
    S = list[Union[str, None]]

    C = Callable[[int], None]  # a generic alias not having a doccomment

    assert inspect.isgenericalias(C) is True
    assert inspect.isgenericalias(Callable) is True
    assert inspect.isgenericalias(T) is True
    assert inspect.isgenericalias(List) is True  # NoQA: UP006
    assert inspect.isgenericalias(S) is True
    assert inspect.isgenericalias(list) is False
    assert inspect.isgenericalias([]) is False
    assert inspect.isgenericalias(object()) is False
    assert inspect.isgenericalias(Base) is False


def test_unpartial():
    def func1(a, b, c):
        pass

    func2 = functools.partial(func1, 1)
    func2.__doc__ = "func2"
    func3 = functools.partial(func2, 2)  # nested partial object

    assert inspect.unpartial(func2) is func1
    assert inspect.unpartial(func3) is func1


def test_getdoc_inherited_classmethod():
    class Foo:
        @classmethod
        def meth(self):
            """
            docstring
                indented text
            """

    class Bar(Foo):
        @classmethod
        def meth(self):
            # inherited classmethod
            pass

    assert inspect.getdoc(Bar.meth, getattr, False, Bar, "meth") is None
    assert inspect.getdoc(Bar.meth, getattr, True, Bar, "meth") == Foo.meth.__doc__


def test_getdoc_inherited_decorated_method():
    class Foo:
        def meth(self):
            """
            docstring
                indented text
            """

    class Bar(Foo):
        @functools.lru_cache  # NoQA: B019
        def meth(self):
            # inherited and decorated method
            pass

    assert inspect.getdoc(Bar.meth, getattr, False, Bar, "meth") is None
    assert inspect.getdoc(Bar.meth, getattr, True, Bar, "meth") == Foo.meth.__doc__


def test_is_builtin_class_method():
    class MyInt(int):
        def my_method(self):
            pass

    assert inspect.is_builtin_class_method(MyInt, 'to_bytes')
    assert inspect.is_builtin_class_method(MyInt, '__init__')
    assert not inspect.is_builtin_class_method(MyInt, 'my_method')
    assert not inspect.is_builtin_class_method(MyInt, 'does_not_exist')
    assert not inspect.is_builtin_class_method(4, 'still does not crash')

    class ObjectWithMroAttr:
        def __init__(self, mro_attr):
            self.__mro__ = mro_attr

    assert not inspect.is_builtin_class_method(ObjectWithMroAttr([1, 2, 3]), 'still does not crash')
