"""Dependency injector callable providers unit tests."""

import sys

import unittest

from dependency_injector import (
    providers,
    errors,
)
from pytest import raises


def _example(arg1, arg2, arg3, arg4):
    return arg1, arg2, arg3, arg4


class CallableTests(unittest.TestCase):

    def test_is_provider(self):
        assert providers.is_provider(providers.Callable(_example)) is True

    def test_init_with_not_callable(self):
        with raises(errors.Error):
            providers.Callable(123)

    def test_init_optional_provides(self):
        provider = providers.Callable()
        provider.set_provides(object)
        assert provider.provides is object
        assert isinstance(provider(), object)

    def test_set_provides_returns_self(self):
        provider = providers.Callable()
        assert provider.set_provides(object) is provider

    def test_provided_instance_provider(self):
        provider = providers.Callable(_example)
        assert isinstance(provider.provided, providers.ProvidedInstance)

    def test_call(self):
        provider = providers.Callable(lambda: True)
        assert provider() is True

    def test_call_with_positional_args(self):
        provider = providers.Callable(_example, 1, 2, 3, 4)
        assert provider() == (1, 2, 3, 4)

    def test_call_with_keyword_args(self):
        provider = providers.Callable(_example, arg1=1, arg2=2, arg3=3, arg4=4)
        assert provider() == (1, 2, 3, 4)

    def test_call_with_positional_and_keyword_args(self):
        provider = providers.Callable(_example, 1, 2, arg3=3, arg4=4)
        assert provider() == (1, 2, 3, 4)

    def test_call_with_context_args(self):
        provider = providers.Callable(_example, 1, 2)
        assert provider(3, 4) == (1, 2, 3, 4)

    def test_call_with_context_kwargs(self):
        provider = providers.Callable(_example, arg1=1)
        assert provider(arg2=2, arg3=3, arg4=4) == (1, 2, 3, 4)

    def test_call_with_context_args_and_kwargs(self):
        provider = providers.Callable(_example, 1)
        assert provider(2, arg3=3, arg4=4) == (1, 2, 3, 4)

    def test_fluent_interface(self):
        provider = providers.Singleton(_example) \
            .add_args(1, 2) \
            .add_kwargs(arg3=3, arg4=4)
        assert provider() == (1, 2, 3, 4)

    def test_set_args(self):
        provider = providers.Callable(_example) \
            .add_args(1, 2) \
            .set_args(3, 4)
        assert provider.args == (3, 4)

    def test_set_kwargs(self):
        provider = providers.Callable(_example) \
            .add_kwargs(init_arg3=3, init_arg4=4) \
            .set_kwargs(init_arg3=4, init_arg4=5)
        assert provider.kwargs == dict(init_arg3=4, init_arg4=5)

    def test_clear_args(self):
        provider = providers.Callable(_example) \
            .add_args(1, 2) \
            .clear_args()
        assert provider.args == tuple()

    def test_clear_kwargs(self):
        provider = providers.Callable(_example) \
            .add_kwargs(init_arg3=3, init_arg4=4) \
            .clear_kwargs()
        assert provider.kwargs == dict()

    def test_call_overridden(self):
        provider = providers.Callable(_example)

        provider.override(providers.Object((4, 3, 2, 1)))
        provider.override(providers.Object((1, 2, 3, 4)))

        assert provider() == (1, 2, 3, 4)

    def test_deepcopy(self):
        provider = providers.Callable(_example)

        provider_copy = providers.deepcopy(provider)

        assert provider is not provider_copy
        assert provider.provides is provider_copy.provides
        assert isinstance(provider, providers.Callable)

    def test_deepcopy_from_memo(self):
        provider = providers.Callable(_example)
        provider_copy_memo = providers.Callable(_example)

        provider_copy = providers.deepcopy(provider, memo={id(provider): provider_copy_memo})

        assert provider_copy is provider_copy_memo

    def test_deepcopy_args(self):
        provider = providers.Callable(_example)
        dependent_provider1 = providers.Callable(list)
        dependent_provider2 = providers.Callable(dict)

        provider.add_args(dependent_provider1, dependent_provider2)

        provider_copy = providers.deepcopy(provider)
        dependent_provider_copy1 = provider_copy.args[0]
        dependent_provider_copy2 = provider_copy.args[1]

        assert provider.args != provider_copy.args

        assert dependent_provider1.provides is dependent_provider_copy1.provides
        assert dependent_provider1 is not dependent_provider_copy1

        assert dependent_provider2.provides is dependent_provider_copy2.provides
        assert dependent_provider2 is not dependent_provider_copy2

    def test_deepcopy_kwargs(self):
        provider = providers.Callable(_example)
        dependent_provider1 = providers.Callable(list)
        dependent_provider2 = providers.Callable(dict)

        provider.add_kwargs(a1=dependent_provider1, a2=dependent_provider2)

        provider_copy = providers.deepcopy(provider)
        dependent_provider_copy1 = provider_copy.kwargs["a1"]
        dependent_provider_copy2 = provider_copy.kwargs["a2"]

        assert provider.kwargs != provider_copy.kwargs

        assert dependent_provider1.provides is dependent_provider_copy1.provides
        assert dependent_provider1 is not dependent_provider_copy1

        assert dependent_provider2.provides is dependent_provider_copy2.provides
        assert dependent_provider2 is not dependent_provider_copy2

    def test_deepcopy_overridden(self):
        provider = providers.Callable(_example)
        object_provider = providers.Object(object())

        provider.override(object_provider)

        provider_copy = providers.deepcopy(provider)
        object_provider_copy = provider_copy.overridden[0]

        assert provider is not provider_copy
        assert provider.provides is provider_copy.provides
        assert isinstance(provider, providers.Callable)

        assert object_provider is not object_provider_copy
        assert isinstance(object_provider_copy, providers.Object)

    def test_deepcopy_with_sys_streams(self):
        provider = providers.Callable(_example)
        provider.add_args(sys.stdin)
        provider.add_kwargs(a2=sys.stdout)

        provider_copy = providers.deepcopy(provider)

        assert provider is not provider_copy
        assert isinstance(provider_copy, providers.Callable)
        assert provider.args[0] is sys.stdin
        assert provider.kwargs["a2"] is sys.stdout

    def test_repr(self):
        provider = providers.Callable(_example)
        assert repr(provider) == (
            "<dependency_injector.providers."
            "Callable({0}) at {1}>".format(repr(_example), hex(id(provider)))
        )


class DelegatedCallableTests(unittest.TestCase):

    def test_inheritance(self):
        assert isinstance(providers.DelegatedCallable(_example),
                              providers.Callable)

    def test_is_provider(self):
        assert providers.is_provider(providers.DelegatedCallable(_example)) is True

    def test_is_delegated_provider(self):
        provider = providers.DelegatedCallable(_example)
        assert providers.is_delegated(provider) is True

    def test_repr(self):
        provider = providers.DelegatedCallable(_example)
        assert repr(provider) == (
            "<dependency_injector.providers."
            "DelegatedCallable({0}) at {1}>".format(repr(_example), hex(id(provider)))
        )


class AbstractCallableTests(unittest.TestCase):

    def test_inheritance(self):
        assert isinstance(providers.AbstractCallable(_example), providers.Callable)

    def test_call_overridden_by_callable(self):
        def _abstract_example():
            pass

        provider = providers.AbstractCallable(_abstract_example)
        provider.override(providers.Callable(_example))

        assert provider(1, 2, 3, 4) == (1, 2, 3, 4)

    def test_call_overridden_by_delegated_callable(self):
        def _abstract_example():
            pass

        provider = providers.AbstractCallable(_abstract_example)
        provider.override(providers.DelegatedCallable(_example))

        assert provider(1, 2, 3, 4) == (1, 2, 3, 4)

    def test_call_not_overridden(self):
        provider = providers.AbstractCallable(_example)

        with raises(errors.Error):
            provider(1, 2, 3, 4)

    def test_override_by_not_callable(self):
        provider = providers.AbstractCallable(_example)

        with raises(errors.Error):
            provider.override(providers.Factory(object))

    def test_provide_not_implemented(self):
        provider = providers.AbstractCallable(_example)

        with raises(NotImplementedError):
            provider._provide((1, 2, 3, 4), dict())

    def test_repr(self):
        provider = providers.AbstractCallable(_example)

        assert repr(provider) == (
            "<dependency_injector.providers."
            "AbstractCallable({0}) at {1}>".format(repr(_example), hex(id(provider)))
        )


class CallableDelegateTests(unittest.TestCase):

    def setUp(self):
        self.delegated = providers.Callable(_example)
        self.delegate = providers.CallableDelegate(self.delegated)

    def test_is_delegate(self):
        assert isinstance(self.delegate, providers.Delegate)

    def test_init_with_not_callable(self):
        with raises(errors.Error):
            providers.CallableDelegate(providers.Object(object()))