#     Copyright 2024, Kay Hayen, mailto:kay.hayen@gmail.com find license text at end of file


""" Return codes

This handles code generation for return statements of normal functions and of
generator functions. Also the value currently being returned, and intercepted
by a try statement is accessible this way.

"""

from nuitka.PythonVersions import python_version

from .CodeHelpers import generateExpressionCode
from .ExceptionCodes import getExceptionUnpublishedReleaseCode
from .LabelCodes import getGotoCode


def generateReturnCode(statement, emit, context):
    getExceptionUnpublishedReleaseCode(emit, context)

    return_value = statement.subnode_expression

    return_value_name = context.getReturnValueName()

    if context.getReturnReleaseMode():
        emit("CHECK_OBJECT(%s);" % return_value_name)
        emit("Py_DECREF(%s);" % return_value_name)

    generateExpressionCode(
        to_name=return_value_name,
        expression=return_value,
        emit=emit,
        context=context,
    )

    if context.needsCleanup(return_value_name):
        context.removeCleanupTempName(return_value_name)
    else:
        emit("Py_INCREF(%s);" % return_value_name)

    getGotoCode(label=context.getReturnTarget(), emit=emit)


def generateReturnedValueCode(statement, emit, context):
    # We don't need the statement, pylint: disable=unused-argument

    getExceptionUnpublishedReleaseCode(emit, context)

    getGotoCode(label=context.getReturnTarget(), emit=emit)


def generateReturnConstantCode(statement, emit, context):
    getExceptionUnpublishedReleaseCode(emit, context)

    return_value_name = context.getReturnValueName()

    if context.getReturnReleaseMode():
        emit("CHECK_OBJECT(%s);" % return_value_name)
        emit("Py_DECREF(%s);" % return_value_name)

    return_value_name.getCType().emitAssignmentCodeFromConstant(
        to_name=return_value_name,
        constant=statement.getConstant(),
        may_escape=True,
        emit=emit,
        context=context,
    )

    if context.needsCleanup(return_value_name):
        context.removeCleanupTempName(return_value_name)
    else:
        emit("Py_INCREF(%s);" % return_value_name)

    getGotoCode(label=context.getReturnTarget(), emit=emit)


def generateGeneratorReturnValueCode(statement, emit, context):
    if context.getOwner().isExpressionAsyncgenObjectBody():
        pass
    elif python_version >= 0x300:
        return_value_name = context.getGeneratorReturnValueName()

        expression = statement.subnode_expression

        if context.getReturnReleaseMode():
            emit("CHECK_OBJECT(%s);" % return_value_name)
            emit("Py_DECREF(%s);" % return_value_name)

        generateExpressionCode(
            to_name=return_value_name, expression=expression, emit=emit, context=context
        )

        if context.needsCleanup(return_value_name):
            context.removeCleanupTempName(return_value_name)
        else:
            emit("Py_INCREF(%s);" % return_value_name)
    elif statement.getParentVariableProvider().needsGeneratorReturnHandling():
        return_value_name = context.getGeneratorReturnValueName()

        generator_return_name = context.allocateTempName(
            "generator_return", "bool", unique=True
        )

        emit("%s = true;" % generator_return_name)

    getGotoCode(context.getReturnTarget(), emit)


def generateGeneratorReturnNoneCode(statement, emit, context):
    if context.getOwner().isExpressionAsyncgenObjectBody():
        pass
    elif python_version >= 0x300:
        return_value_name = context.getGeneratorReturnValueName()

        if context.getReturnReleaseMode():
            emit("CHECK_OBJECT(%s);" % return_value_name)
            emit("Py_DECREF(%s);" % return_value_name)

        return_value_name.getCType().emitAssignmentCodeFromConstant(
            to_name=return_value_name,
            constant=None,
            may_escape=False,
            emit=emit,
            context=context,
        )

        if context.needsCleanup(return_value_name):
            context.removeCleanupTempName(return_value_name)
        else:
            emit("Py_INCREF(%s);" % return_value_name)
    elif statement.getParentVariableProvider().needsGeneratorReturnHandling():
        return_value_name = context.getGeneratorReturnValueName()

        generator_return_name = context.allocateTempName(
            "generator_return", "bool", unique=True
        )

        emit("%s = true;" % generator_return_name)

    getGotoCode(context.getReturnTarget(), emit)


#     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.
