#!/usr/bin/env python3

# Copyright 2015 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.


"""Updates testdata/ based on data pulled from Chromium sources."""

from __future__ import print_function

import argparse
import base64
import json
# pylint: disable=cros-logging-import
import logging
import os
import re
import subprocess
import sys

import yaml


# URLs to GIT paths.
SRC_GIT_URL = 'https://chromium.googlesource.com/chromium/src/+/HEAD/'

TESTDATA_PATH = os.path.join(os.path.dirname(__file__), 'testdata')


def GetChromiumSource(file_path):
  """Gets Chromium source code by given path.

  Args:
    file_path: The relative path to retrieve.
  """
  return base64.b64decode(subprocess.check_output(
      ['curl', '-s', SRC_GIT_URL + file_path + '?format=TEXT'])).decode('utf-8')


def WriteTestData(name, value):
  if not value:
    sys.exit('No values found for %s' % name)

  path = os.path.join(TESTDATA_PATH, name + '.yaml')
  logging.info('%s: writing %r', path, value)
  with open(path, 'w') as f:
    f.write('# Automatically generated from ToT Chromium sources\n'
            '# by update_testdata.py. Do not edit manually.\n'
            '\n')
    yaml.dump(value, f, default_flow_style=False)


def UpdateLocales():
  """Updates locales.

  Valid locales are entries of the kAcceptLanguageList array in
  l10n_util.cc <http://goo.gl/z8XsZJ>.
  """
  cpp_code = GetChromiumSource('ui/base/l10n/l10n_util.cc')
  match = re.search(r'static[^\n]+kAcceptLanguageList\[\] = \{(.+?)^\}',
                    cpp_code, re.DOTALL | re.MULTILINE)
  if not match:
    sys.exit('Unable to find language list')

  locales = re.findall(r'"(.+)"', match.group(1))
  if not locales:
    sys.exit('Unable to parse language list')

  WriteTestData('locales', sorted(locales))


def UpdateTimeZones():
  """Updates time zones.

  Valid time zones are values of the kTimeZones array in timezone_settings.cc
  <http://goo.gl/WSVUeE>.
  """
  cpp_code = GetChromiumSource('chromeos/settings/timezone_settings.cc')
  match = re.search(r'static[^\n]+kTimeZones\[\] = \{(.+?)^\}',
                    cpp_code, re.DOTALL | re.MULTILINE)
  if not match:
    sys.exit('Unable to find time zones')

  time_zones = re.findall(r'"(.+)"', match.group(1))
  if not time_zones:
    sys.exit('Unable to parse time zones')

  WriteTestData('time_zones', time_zones)


def UpdateMigrationMap():
  """Updates the input method migration map.

  The source is the kEngineIdMigrationMap array in input_method_util.cc
  <https://chromium.googlesource.com/chromium/src/+/HEAD/ui/base/ime/chromeos/input_method_util.cc>.
  """
  cpp_code = GetChromiumSource('ui/base/ime/chromeos/input_method_util.cc')
  match = re.search(r'kEngineIdMigrationMap\[\]\[2\] = \{(.+?)^\}',
                    cpp_code, re.DOTALL | re.MULTILINE)
  if not match:
    sys.exit('Unable to find kEngineIdMigrationMap')

  map_code = match.group(1)
  migration_map = re.findall(r'{"(.+?)", "(.+?)"}', map_code)
  if not migration_map:
    sys.exit('Unable to parse kEngineIdMigrationMap')

  WriteTestData('migration_map', migration_map)


def UpdateInputMethods():
  """Updates input method IDs.

  This is the union of all 'id' fields in input_method/*.json
  <http://goo.gl/z4JGvK>.
  """
  # entry format: 100644 blob 48de6e64885e472c6743543cc988ac0fd8edd55e    FILE
  json_dir = 'chrome/browser/resources/chromeos/input_method'
  files = [line.strip().split()[-1]
           for line in GetChromiumSource(json_dir).splitlines()]
  pattern = re.compile(r'\.json$')
  json_files = [f for f in files if pattern.search(f)]

  input_methods = set()
  for f in json_files:
    contents = json.loads(GetChromiumSource(os.path.join(json_dir, f)))
    for c in contents['input_components']:
      input_methods.add(str(c['id']))

  WriteTestData('input_methods', sorted(input_methods))


def main():
  parser = argparse.ArgumentParser(
      description=('Updates some constants in regions_unittest_data.py based '
                   'on data pulled from Chromium sources. This overwrites '
                   'files in testdata, which you must then submit.'))
  unused_args = parser.parse_args()
  logging.basicConfig(level=logging.INFO)

  UpdateLocales()
  UpdateTimeZones()
  UpdateInputMethods()
  UpdateMigrationMap()

  logging.info('Run "git diff %s" to see changes (if any).', TESTDATA_PATH)
  logging.info('Make sure to submit any changes to %s!', TESTDATA_PATH)


if __name__ == '__main__':
  main()