#     Copyright 2018, 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.
#
""" Codes for classes.

Most the class specific stuff is solved in re-formulation. Only the selection
of the metaclass remains as specific.
"""

from nuitka.PythonVersions import python_version

from .CodeHelpers import (
    generateChildExpressionsCode,
    withObjectCodeTemporaryAssignment
)
from .ErrorCodes import getErrorExitCode


def generateSelectMetaclassCode(to_name, expression, emit, context):
    metaclass_name, bases_name = generateChildExpressionsCode(
        expression = expression,
        emit       = emit,
        context    = context
    )

    # This is used for Python3 only.
    assert python_version >= 300

    arg_names = [
        metaclass_name,
        bases_name
    ]

    with withObjectCodeTemporaryAssignment(to_name, "metaclass_result", expression, emit, context) \
      as value_name:

        emit(
            "%s = SELECT_METACLASS( %s );" % (
                value_name,
                ", ".join(
                    str(arg_name)
                    for arg_name in
                    arg_names
                )
            )
        )

        getErrorExitCode(
            check_name    = value_name,
            release_names = arg_names,
            emit          = emit,
            context       = context
        )

        context.addCleanupTempName(value_name)


def generateBuiltinSuperCode(to_name, expression, emit, context):
    type_name, object_name = generateChildExpressionsCode(
        expression = expression,
        emit       = emit,
        context    = context
    )

    with withObjectCodeTemporaryAssignment(to_name, "super_value", expression, emit, context) \
      as value_name:

        emit(
            "%s = BUILTIN_SUPER( %s, %s );" % (
                value_name,
                type_name if type_name is not None else "NULL",
                object_name if object_name is not None else "NULL"
            )
        )

        getErrorExitCode(
            check_name    = value_name,
            release_names = (type_name, object_name),
            emit          = emit,
            context       = context
        )

        context.addCleanupTempName(value_name)
