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"""
This module defines classes and functions used to mock Pqos class
and the underlying libpqos library's APIs.
"""

from __future__ import absolute_import, division, print_function

from pqos import Pqos


class PqosMock(object):
    "Pqos class mock."

    def __init__(self, lib):
        self.lib = lib

    def init(self, *args, **kwargs):
        "PQoS library initialization stub."

    def fini(self):
        "PQoS library finalization stub."


class CustomMock(object):  # pylint: disable=too-few-public-methods
    "Custom object that has methods that can be mocked later."


def mock_pqos_lib(func):
    "Mocks pqos library (ctypes DLL) in Pqos class."

    def wrapper(self):
        "Configures Pqos class to use mock library object."
        lib = CustomMock()
        instance_mock = PqosMock(lib)
        instance = Pqos()
        Pqos.set_instance(instance_mock)
        result = func(self, lib)
        Pqos.set_instance(instance)
        return result

    wrapper.__doc__ = func.__doc__
    return wrapper
