#  Copyright (c) 2008-2016 Szczepan Faber, Serhiy Oplakanets, Herr Kaste
#
#  Permission is hereby granted, free of charge, to any person obtaining a copy
#  of this software and associated documentation files (the "Software"), to deal
#  in the Software without restriction, including without limitation the rights
#  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
#  copies of the Software, and to permit persons to whom the Software is
#  furnished to do so, subject to the following conditions:
#
#  The above copyright notice and this permission notice shall be included in
#  all copies or substantial portions of the Software.
#
#  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
#  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
#  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
#  THE SOFTWARE.

import inspect
from . import invocation
from .mock_registry import mock_registry
import warnings


__all__ = ['mock', 'Mock']


class _Dummy(object):
    pass


class TestDouble(object):
    pass


class RememberedInvocationBuilder(object):
    def __init__(self, mock, method_name):
        self.mock = mock
        self.method_name = method_name

    def __call__(self, *params, **named_params):
        invoc = invocation.RememberedInvocation(self.mock, self.method_name)
        return invoc(*params, **named_params)


class mock(TestDouble):
    def __init__(self, mocked_obj=None, strict=True):
        self.invocations = []
        self.stubbed_invocations = []
        self.original_methods = []
        self.stubbing = None
        self.verification = None
        if mocked_obj is None:
            mocked_obj = _Dummy()
            strict = False
        self.mocked_obj = mocked_obj
        self.strict = strict
        self.stubbing_real_object = False

        mock_registry.register(self)

    def __getattr__(self, method_name):
        if self.stubbing is not None:
            return invocation.StubbedInvocation(self, method_name)

        if self.verification is not None:
            return invocation.VerifiableInvocation(self, method_name)

        return RememberedInvocationBuilder(self, method_name)

    def remember(self, invocation):
        self.invocations.insert(0, invocation)

    def finish_stubbing(self, stubbed_invocation):
        self.stubbed_invocations.insert(0, stubbed_invocation)
        self.stubbing = None

    def expect_stubbing(self):
        self.stubbing = True

    def pull_verification(self):
        v = self.verification
        self.verification = None
        return v

    def has_method(self, method_name):
        return hasattr(self.mocked_obj, method_name)

    def get_method(self, method_name):
        return self.mocked_obj.__dict__.get(method_name)

    def set_method(self, method_name, new_method):
        setattr(self.mocked_obj, method_name, new_method)

    def replace_method(self, method_name, original_method):

        def new_mocked_method(*args, **kwargs):
            # we throw away the first argument, if it's either self or cls
            if (inspect.isclass(self.mocked_obj) and
                    not isinstance(original_method, staticmethod)):
                args = args[1:]

            # that is: invocation.RememberedInvocation(self, method_name)
            call = self.__getattr__(method_name)
            return call(*args, **kwargs)

        if isinstance(original_method, staticmethod):
            new_mocked_method = staticmethod(new_mocked_method)
        elif isinstance(original_method, classmethod):
            new_mocked_method = classmethod(new_mocked_method)

        self.set_method(method_name, new_mocked_method)

    def stub(self, method_name):
        original_method = self.get_method(method_name)
        original = (method_name, original_method)
        self.original_methods.append(original)

        # If we're trying to stub real object(not a generated mock), then we
        # should patch object to use our mock method.
        # TODO: Polymorphism was invented long time ago. Refactor this.
        if self.stubbing_real_object:
            self.replace_method(method_name, original_method)

    def unstub(self):
        while self.original_methods:
            method_name, original_method = self.original_methods.pop()
            self.set_method(method_name, original_method)


def Mock(*args, **kwargs):
    '''A ``mock``() alias.

    Alias for compatibility. To be removed in version 1.0.
    '''
    warnings.warn("\n`Mock()` is deprecated, please use `mock()` (lower 'm') "
                  "instead.", DeprecationWarning)
    return mock(*args, **kwargs)
