# Copyright 2004-2006 The Regents of The University of Michigan
# Copyright 2010-20013 Advanced Micro Devices, Inc.
# Copyright 2013 Mark D. Hill and David A. Wood
# Copyright 2017-2020 ARM Limited
# Copyright 2021 Google, Inc.
#
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import argparse
import importlib
import os.path
import sys

import importer
from code_formatter import code_formatter

parser = argparse.ArgumentParser()
parser.add_argument("modpath", help="module the enum belongs to")
parser.add_argument("enum_cc", help="enum cc file to generate")
parser.add_argument(
    "use_python", help="whether python is enabled in gem5 (True or False)"
)

args = parser.parse_args()

use_python = args.use_python.lower()
if use_python == "true":
    use_python = True
elif use_python == "false":
    use_python = False
else:
    print(f'Unrecognized "use_python" value {use_python}', file=sys.stderr)
    sys.exit(1)

basename = os.path.basename(args.enum_cc)
enum_name = os.path.splitext(basename)[0]

importer.install()
module = importlib.import_module(args.modpath)
enum = getattr(module, enum_name)

code = code_formatter()

wrapper_name = enum.wrapper_name
file_name = enum.__name__
name = enum.__name__ if enum.enum_name is None else enum.enum_name

code(
    """#include "base/compiler.hh"
#include "enums/$file_name.hh"

namespace gem5
{

"""
)

if enum.wrapper_is_struct:
    code("const char *${wrapper_name}::${name}Strings[Num_${name}] =")
else:
    if enum.is_class:
        code(
            """\
const char *${name}Strings[static_cast<int>(${name}::Num_${name})] =
"""
        )
    else:
        code(
            """namespace ${wrapper_name}
{"""
        )
        code.indent(1)
        code("const char *${name}Strings[Num_${name}] =")

code("{")
code.indent(1)
for val in enum.vals:
    code('"$val",')
code.dedent(1)
code("};")

if not enum.wrapper_is_struct and not enum.is_class:
    code.dedent(1)
    code("} // namespace ${wrapper_name}")

code("} // namespace gem5")


if use_python:
    name = enum.__name__
    enum_name = enum.__name__ if enum.enum_name is None else enum.enum_name
    wrapper_name = enum_name if enum.is_class else enum.wrapper_name

    code(
        """#include "pybind11/pybind11.h"
#include "pybind11/stl.h"

#include <sim/init.hh>

namespace py = pybind11;

namespace gem5
{

static void
module_init(py::module_ &m_internal)
{
    py::module_ m = m_internal.def_submodule("enum_${name}");

"""
    )
    if enum.is_class:
        code('py::enum_<${enum_name}>(m, "enum_${name}")')
    else:
        code('py::enum_<${wrapper_name}::${enum_name}>(m, "enum_${name}")')

    code.indent()
    code.indent()
    for val in enum.vals:
        code('.value("${val}", ${wrapper_name}::${val})')
    code('.value("Num_${name}", ${wrapper_name}::Num_${enum_name})')
    if not enum.is_class:
        code(".export_values()")
    code(";")
    code.dedent()

    code("}")
    code.dedent()
    code(
        """
static EmbeddedPyBind embed_enum("enum_${name}", module_init);

} // namespace gem5
    """
    )

code.write(args.enum_cc)