#!/usr/bin/env python3

# Copyright 2022 gRPC authors.
#
# 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.

# Check for includes of the form `#include "bar.h"` - i.e. not including the subdirectory. We require instead `#include "foo/bar.h"`.

import argparse
import os
import re
import sys

# find our home
ROOT = os.path.abspath(os.path.join(os.path.dirname(sys.argv[0]), '../..'))
os.chdir(ROOT)

# parse command line
argp = argparse.ArgumentParser(description='include guard checker')
argp.add_argument('-f', '--fix', default=False, action='store_true')
args = argp.parse_args()

# error count
errors = 0

CHECK_SUBDIRS = [
    'src/core',
    'src/cpp',
    'test/core',
    'test/cpp',
]

for subdir in CHECK_SUBDIRS:
    for root, dirs, files in os.walk(subdir):
        for f in files:
            if f.endswith('.h') or f.endswith('.cc'):
                fpath = os.path.join(root, f)
                output = open(fpath, 'r').readlines()
                changed = False
                for (i, line) in enumerate(output):
                    m = re.match(r'^#include "([^"]*)"(.*)', line)
                    if not m:
                        continue
                    include = m.group(1)
                    if '/' in include:
                        continue
                    expect_path = os.path.join(root, include)
                    trailing = m.group(2)
                    if not os.path.exists(expect_path):
                        continue
                    changed = True
                    errors += 1
                    output[i] = '#include "{0}"{1}\n'.format(
                        expect_path, trailing)
                    print("Found naked include '{0}' in {1}".format(
                        include, fpath))
                if changed and args.fix:
                    open(fpath, 'w').writelines(output)

if errors > 0:
    print('{} errors found.'.format(errors))
    sys.exit(1)