# 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_hh', help='enum header file to generate')

args = parser.parse_args()

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

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

code = code_formatter()

# Generate C++ class declaration for this enum type.
# Note that we wrap the enum in a class/struct to act as a namespace,
# so that the enum strings can be brief w/o worrying about collisions.
wrapper_name = enum.wrapper_name
wrapper = 'struct' if enum.wrapper_is_struct else 'namespace'
name = enum.__name__ if enum.enum_name is None else enum.enum_name
idem_macro = '__ENUM__%s__%s__' % (wrapper_name, name)

code('''\
#ifndef $idem_macro
#define $idem_macro

namespace gem5
{
''')
if enum.is_class:
    code('''\
enum class $name
{
''')
else:
    code('''\
$wrapper $wrapper_name {
enum $name
{
''')
    code.indent(1)
code.indent(1)
for val in enum.vals:
    code('$val = ${{enum.map[val]}},')
code('Num_$name = ${{len(enum.vals)}}')
code.dedent(1)
code('};')

if enum.is_class:
    code('''\
extern const char *${name}Strings[static_cast<int>(${name}::Num_${name})];
''')
elif enum.wrapper_is_struct:
    code('static const char *${name}Strings[Num_${name}];')
else:
    code('extern const char *${name}Strings[Num_${name}];')

if not enum.is_class:
    code.dedent(1)
    code('}; // $wrapper_name')

code()
code('} // namespace gem5')

code()
code('#endif // $idem_macro')

code.write(args.enum_hh)