#     Copyright 2016, 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.
#
""" Code generation for code objects.

Right now only the creation is done here. But more should be added later on.
"""

from nuitka import Options
from nuitka.PythonVersions import python_version
from nuitka.utils.Utils import isAbsolutePath

from .ConstantCodes import getConstantCode


def getCodeObjectsDeclCode(context):
    statements = []

    for _code_object_key, code_identifier in context.getCodeObjects():
        declaration = "static PyCodeObject *%s;" % code_identifier

        statements.append(declaration)

    if context.getOwner().getFullName() == "__main__":
        statements.append("/* For use in MainProgram.cpp. */")
        statements.append("PyCodeObject *codeobj_main = NULL;")

    return statements

def getCodeObjectsInitCode(context):
    # There is a bit of details to this, code objects have many flags to deal
    # with, and we are making some optimizations as well as customization to
    # what path should be put there, pylint: disable=R0912

    statements = []

    code_objects = context.getCodeObjects()

    # Create the always identical, but dynamic filename first thing.
    if code_objects:
        context.markAsNeedsModuleFilenameObject()
        filename_code = "module_filename_obj"

    if context.needsModuleFilenameObject():
        module_filename = context.getOwner().getRunTimeFilename()

        # We do not care about release of this object, as code object live
        # forever anyway.
        if Options.getFileReferenceMode() == "frozen" or \
           isAbsolutePath(module_filename):
            template = "module_filename_obj = %s;"
        else:
            template = "module_filename_obj = MAKE_RELATIVE_PATH( %s );"

        statements.append(
            template % (
                context.getConstantCode(
                    constant = module_filename
                )
            )
        )

    for code_object_key, code_identifier in code_objects:
        co_flags = []

        # Make sure the filename is always identical.
        assert code_object_key[0] == module_filename

        if code_object_key[6] == "Generator":
            co_flags.append("CO_GENERATOR")
        elif code_object_key[6] == "Coroutine":
            co_flags.append("CO_COROUTINE")

        if code_object_key[7]:
            co_flags.append("CO_OPTIMIZED")

        if code_object_key[8]:
            co_flags.append("CO_NEWLOCALS")

        if code_object_key[9]:
            co_flags.append("CO_VARARGS")

        if code_object_key[10]:
            co_flags.append("CO_VARKEYWORDS")

        if not code_object_key[11]:
            co_flags.append("CO_NOFREE")

        co_flags.extend(code_object_key[12])

        if python_version < 300:
            code = "%s = MAKE_CODEOBJ( %s, %s, %d, %s, %d, %s );" % (
                code_identifier,
                filename_code,
                getConstantCode(
                    constant = code_object_key[1],
                    context  = context
                ),
                code_object_key[2],
                getConstantCode(
                    constant = code_object_key[3],
                    context  = context
                ),
                code_object_key[4],
                " | ".join(co_flags) or '0',
            )
        else:
            code = "%s = MAKE_CODEOBJ( %s, %s, %d, %s, %d, %d, %s );" % (
                code_identifier,
                filename_code,
                getConstantCode(
                    constant = code_object_key[1],
                    context  = context
                ),
                code_object_key[2],
                getConstantCode(
                    constant = code_object_key[3],
                    context  = context
                ),
                code_object_key[4],
                code_object_key[5],
                " | ".join(co_flags) or  '0',
            )

        statements.append(code)

        if context.getOwner().getFullName() == "__main__":
            if code_object_key[1] == "<module>":
                statements.append("codeobj_main = %s;" % code_identifier)
    return statements
