#!/usr/bin/env python3

# Copyright 2017 Google Inc.
#
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import hashlib
import os
import shutil
import stat
import sys

if sys.version_info[0] < 3:
  from urllib2 import urlopen
else:
  from urllib.request import urlopen

os.chdir(os.path.join(os.path.dirname(__file__), os.pardir))

def fetch(target):
  target_path = 'buildtools/linux64/' + target if 'linux'  in sys.platform else \
                'buildtools/mac/' + target     if 'darwin' in sys.platform else \
                'buildtools/win/'+ target + '.exe'

  sha1_path = target_path + '.sha1'
  if not os.path.exists(sha1_path):
    print(sha1_path, 'is missing. Did you run `tools/git-sync-deps`?')
    exit(1)
  sha1 = open(sha1_path).read().strip()

  def sha1_of_file(path):
    h = hashlib.sha1()
    if os.path.isfile(path):
      with open(path, 'rb') as f:
        h.update(f.read())
    return h.hexdigest()

  if sha1_of_file(target_path) != sha1:
    with open(target_path, 'wb') as f:
      url = 'https://chromium-%s.storage-download.googleapis.com/%s' % (target, sha1)
      f.write(urlopen(url).read())

    os.chmod(target_path, stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR |
                          stat.S_IRGRP                | stat.S_IXGRP |
                          stat.S_IROTH                | stat.S_IXOTH )

  target_copy_path = os.path.join('bin', os.path.basename(target_path))
  if sha1_of_file(target_copy_path) != sha1:
    shutil.copy(target_path, target_copy_path)

fetch('clang-format')