"""`Callable` providers examples."""

from objects.providers import Callable
from objects.providers import Singleton

from objects.injections import KwArg


class UserService(object):

    """Example class UserService."""

    def get_by_id(self, id):
        """Return user info by user id."""
        return {'id': id, 'login': 'example_user'}


def get_user_by_id(user_id, users_service):
    """Example function that has input arg and dependency on database."""
    return users_service.get_by_id(user_id)


# UserService and get_user_by_id providers:
users_service = Singleton(UserService)
get_user_by_id = Callable(get_user_by_id,
                          KwArg('users_service', users_service))

# Making some asserts:
assert get_user_by_id(1) == {'id': 1, 'login': 'example_user'}
assert get_user_by_id(2) == {'id': 2, 'login': 'example_user'}


# Context keyword arguments priority example:
class UserServiceMock(object):

    """Example class UserService."""

    def get_by_id(self, id):
        """Return user info by user id."""
        return {'id': id, 'login': 'mock'}


user_service_mock = UserServiceMock()

user3 = get_user_by_id(1, users_service=user_service_mock)

assert user3 == {'id': 1, 'login': 'mock'}