#     Copyright 2019, Kay Hayen, mailto:kay.hayen@gmail.com
#
#     Part of "Nuitka", an optimizing Python compiler that is compatible and
#     integrates with CPython, but also works on its own.
#
#     Licensed under the Apache License, Version 2.0 (the "License");
#     you may not use this file except in compliance with the License.
#     You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#     Unless required by applicable law or agreed to in writing, software
#     distributed under the License is distributed on an "AS IS" BASIS,
#     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#     See the License for the specific language governing permissions and
#     limitations under the License.
#
""" Standard plug-in to make enum module work when compiled.

The enum module provides a free function __new__ in class dictionaries to
manual metaclass calls. These become then unbound methods instead of static
methods, due to CPython only checking for plain uncompiled functions.
"""

from nuitka.plugins.PluginBase import NuitkaPluginBase
from nuitka.PythonVersions import python_version


class NuitkaPluginEnumWorkarounds(NuitkaPluginBase):
    """ This is to make enum module work when compiled with Nuitka.

    """

    plugin_name = "enum-compat"

    @staticmethod
    def isRelevant():
        return python_version < 300

    @staticmethod
    def isAlwaysEnabled():
        return True

    @staticmethod
    def createPostModuleLoadCode(module):
        full_name = module.getFullName()

        if full_name == "enum":
            code = """\
from __future__ import absolute_import
import enum
try:
    enum.Enum.__new__ = staticmethod(enum.Enum.__new__.__func__)
    enum.IntEnum.__new__ = staticmethod(enum.IntEnum.__new__.__func__)
except AttributeError:
    pass
"""
            return (
                code,
                """\
Monkey patching "enum" for compiled '__new__' methods.""",
            )

        return None, None
