# Copyright (c) 2014 The Chromium Embedded Framework Authors. All rights
# reserved. Use of this source code is governed by a BSD-style license that
# can be found in the LICENSE file.

from __future__ import absolute_import
from __future__ import print_function
from datetime import datetime
from io import open
from optparse import OptionParser
import os
import re
import shlex
import shutil
import subprocess
import sys
import tempfile
import zipfile

is_python2 = sys.version_info.major == 2

if is_python2:
  from urllib import FancyURLopener
  from urllib2 import urlopen
else:
  from urllib.request import FancyURLopener, urlopen

##
# Default URLs.
##

depot_tools_url = 'https://chromium.googlesource.com/chromium/tools/depot_tools.git'
depot_tools_archive_url = 'https://storage.googleapis.com/chrome-infra/depot_tools.zip'

cef_git_url = 'https://bitbucket.org/chromiumembedded/cef.git'

##
# Global system variables.
##

# Script directory.
script_dir = os.path.dirname(__file__)

##
# Helper functions.
##


def msg(message):
  """ Output a message. """
  sys.stdout.write('--> ' + message + "\n")


def run(command_line, working_dir, depot_tools_dir=None, output_file=None):
  """ Runs the specified command. """
  # add depot_tools to the path
  env = os.environ
  if not depot_tools_dir is None:
    env['PATH'] = depot_tools_dir + os.pathsep + env['PATH']

  sys.stdout.write('-------- Running "'+command_line+'" in "'+\
                   working_dir+'"...'+"\n")
  if not options.dryrun:
    args = shlex.split(command_line.replace('\\', '\\\\'))

    if not output_file:
      return subprocess.check_call(
          args, cwd=working_dir, env=env, shell=(sys.platform == 'win32'))
    try:
      msg('Writing %s' % output_file)
      with open(output_file, 'w', encoding='utf-8') as fp:
        return subprocess.check_call(
            args,
            cwd=working_dir,
            env=env,
            shell=(sys.platform == 'win32'),
            stderr=subprocess.STDOUT,
            stdout=fp)
    except subprocess.CalledProcessError:
      msg('ERROR Run failed. See %s for output.' % output_file)
      raise


def create_directory(path):
  """ Creates a directory if it doesn't already exist. """
  if not os.path.exists(path):
    msg("Creating directory %s" % (path))
    if not options.dryrun:
      os.makedirs(path)


def delete_directory(path):
  """ Removes an existing directory. """
  if os.path.exists(path):
    msg("Removing directory %s" % (path))
    if not options.dryrun:
      shutil.rmtree(path, onerror=onerror)


def copy_directory(source, target, allow_overwrite=False):
  """ Copies a directory from source to target. """
  if not options.dryrun and os.path.exists(target):
    if not allow_overwrite:
      raise Exception("Directory %s already exists" % (target))
    remove_directory(target)
  if os.path.exists(source):
    msg("Copying directory %s to %s" % (source, target))
    if not options.dryrun:
      shutil.copytree(source, target)


def move_directory(source, target, allow_overwrite=False):
  """ Copies a directory from source to target. """
  if not options.dryrun and os.path.exists(target):
    if not allow_overwrite:
      raise Exception("Directory %s already exists" % (target))
    remove_directory(target)
  if os.path.exists(source):
    msg("Moving directory %s to %s" % (source, target))
    if not options.dryrun:
      shutil.move(source, target)


def is_git_checkout(path):
  """ Returns true if the path represents a git checkout. """
  return os.path.exists(os.path.join(path, '.git'))


def exec_cmd(cmd, path):
  """ Execute the specified command and return the result. """
  out = ''
  err = ''
  sys.stdout.write("-------- Running \"%s\" in \"%s\"...\n" % (cmd, path))
  parts = cmd.split()
  try:
    process = subprocess.Popen(
        parts,
        cwd=path,
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
        shell=(sys.platform == 'win32'))
    out, err = process.communicate()
  except IOError as e:
    (errno, strerror) = e.args
    raise
  except:
    raise
  return {'out': out.decode('utf-8'), 'err': err.decode('utf-8')}


def get_git_hash(path, branch):
  """ Returns the git hash for the specified branch/tag/hash. """
  cmd = "%s rev-parse %s" % (git_exe, branch)
  result = exec_cmd(cmd, path)
  if result['out'] != '':
    return result['out'].strip()
  return 'Unknown'


def get_git_url(path):
  """ Returns the origin url for the specified path. """
  cmd = "%s config --get remote.origin.url" % (git_exe)
  result = exec_cmd(cmd, path)
  if result['out'] != '':
    return result['out'].strip()
  return 'Unknown'


def download_and_extract(src, target):
  """ Extracts the contents of src, which may be a URL or local file, to the
      target directory. """
  temporary = False

  if src[:4] == 'http':
    # Attempt to download a URL.
    opener = FancyURLopener({})
    response = opener.open(src)

    temporary = True
    handle, archive_path = tempfile.mkstemp(suffix='.zip')
    os.write(handle, response.read())
    os.close(handle)
  elif os.path.exists(src):
    # Use a local file.
    archive_path = src
  else:
    raise Exception('Path type is unsupported or does not exist: ' + src)

  if not zipfile.is_zipfile(archive_path):
    raise Exception('Not a valid zip archive: ' + src)

  # Attempt to extract the archive file.
  try:
    os.makedirs(target)
    zf = zipfile.ZipFile(archive_path, 'r')
    zf.extractall(target)
  except:
    shutil.rmtree(target, onerror=onerror)
    raise
  zf.close()

  # Delete the archive file if temporary.
  if temporary and os.path.exists(archive_path):
    os.remove(archive_path)


def read_file(path):
  """ Read a file. """
  if os.path.exists(path):
    with open(path, 'r', encoding='utf-8') as fp:
      return fp.read()
  else:
    raise Exception("Path does not exist: %s" % (path))


def write_fp(fp, data):
  if is_python2:
    fp.write(data.decode('utf-8'))
  else:
    fp.write(data)


def write_file(path, data):
  """ Write a file. """
  msg('Writing %s' % path)
  if not options.dryrun:
    with open(path, 'w', encoding='utf-8') as fp:
      write_fp(fp, data)


def read_config_file(path):
  """ Read a configuration file. """
  # Parse the contents.
  return eval(read_file(path), {'__builtins__': None}, None)


def write_config_file(path, contents):
  """ Write a configuration file. """
  data = "{\n"
  for key in sorted(contents.keys()):
    data += "  '%s': '%s',\n" % (key, contents[key])
  data += "}\n"
  write_file(path, data)


def read_branch_config_file(path):
  """ Read the CEF branch from the specified path. """
  config_file = os.path.join(path, 'cef.branch')
  if os.path.isfile(config_file):
    contents = read_config_file(config_file)
    if 'branch' in contents:
      return contents['branch']
  return ''


def write_branch_config_file(path, branch):
  """ Write the CEF branch to the specified path. """
  config_file = os.path.join(path, 'cef.branch')
  if not os.path.isfile(config_file):
    write_config_file(config_file, {'branch': branch})


def apply_patch(name):
  patch_file = os.path.join(cef_dir, 'patch', 'patches', name)
  if os.path.exists(patch_file + ".patch"):
    # Attempt to apply the patch file.
    patch_tool = os.path.join(cef_dir, 'tools', 'patcher.py')
    run('%s %s --patch-file "%s" --patch-dir "%s"' %
        (python_exe, patch_tool, patch_file,
         chromium_src_dir), chromium_src_dir, depot_tools_dir)


def apply_deps_patch():
  """ Patch the Chromium DEPS file before `gclient sync` if necessary. """
  deps_path = os.path.join(chromium_src_dir, deps_file)
  if os.path.isfile(deps_path):
    msg("Chromium DEPS file: %s" % (deps_path))
    apply_patch(deps_file)
  else:
    raise Exception("Path does not exist: %s" % (deps_path))


def apply_runhooks_patch():
  """ Patch the Chromium runhooks files before `gclient runhooks` if necessary. """
  apply_patch('runhooks')


def run_patch_updater(args='', output_file=None):
  """ Run the patch updater script. """
  tool = os.path.join(cef_src_dir, 'tools', 'patch_updater.py')
  if len(args) > 0:
    args = ' ' + args
  run('%s %s%s' % (python_exe, tool, args), cef_src_dir, depot_tools_dir,
      output_file)


def onerror(func, path, exc_info):
  """
  Error handler for ``shutil.rmtree``.

  If the error is due to an access error (read only file)
  it attempts to add write permission and then retries.

  If the error is for another reason it re-raises the error.

  Usage : ``shutil.rmtree(path, onerror=onerror)``
  """
  import stat
  if not os.access(path, os.W_OK):
    # Is the error an access error ?
    os.chmod(path, stat.S_IWUSR)
    func(path)
  else:
    raise


def get_chromium_main_position(commit):
  """ Returns the closest main position for the specified Chromium commit. """
  # Using -2 because a "Publish DEPS" commit which does not have a master
  # position may be first.
  cmd = "%s log -2 %s" % (git_exe, commit)
  result = exec_cmd(cmd, chromium_src_dir)
  if result['out'] != '':
    match = re.search(r'refs/heads/(?:master|main)@{#([\d]+)}', result['out'])
    assert match != None, 'Failed to find position'
    return int(match.groups()[0])
  return None


def get_chromium_main_commit(position):
  """ Returns the main commit for the specified Chromium commit position. """
  cmd = '%s log -1 --grep=refs/heads/master@{#%s} --grep=refs/heads/main@{#%s} origin/main' % (
      git_exe, str(position), str(position))
  result = exec_cmd(cmd, chromium_src_dir)
  if result['out'] != '':
    match = re.search(r'^commit ([a-f0-9]+)', result['out'])
    assert match != None, 'Failed to find commit'
    return match.groups()[0]
  return None


def get_build_compat_versions():
  """ Returns the compatible Chromium and (optionally) depot_tools versions
      specified by the CEF checkout. """
  compat_path = os.path.join(cef_dir, 'CHROMIUM_BUILD_COMPATIBILITY.txt')
  msg("Reading %s" % compat_path)
  config = read_config_file(compat_path)

  if not 'chromium_checkout' in config:
    raise Exception("Missing chromium_checkout value in %s" % (compat_path))
  return config


def get_build_directory_name(is_debug):
  build_dir = ('Debug' if is_debug else 'Release') + '_'

  # CEF uses a consistent directory naming scheme for GN via
  # GetAllPlatformConfigs in tools/gn_args.py.
  if options.x64build:
    build_dir += 'GN_x64'
  elif options.armbuild:
    build_dir += 'GN_arm'
  elif options.arm64build:
    build_dir += 'GN_arm64'
  else:
    build_dir += 'GN_x86'
  return build_dir


def read_update_file():
  update_path = os.path.join(cef_src_dir, 'CHROMIUM_UPDATE.txt')
  if not os.path.exists(update_path):
    msg("Missing file: %s" % update_path)
    return None

  msg("Reading %s" % update_path)
  return read_config_file(update_path)


def log_chromium_changes():
  """ Evaluate the Chromium checkout for changes. """
  config = read_update_file()
  if config is None:
    msg("Skipping Chromium changes log.")
    return

  if 'files' in config:
    out_file = os.path.join(download_dir, 'chromium_update_changes.diff')
    if os.path.exists(out_file):
      os.remove(out_file)

    old_commit = get_chromium_main_commit(
        get_chromium_main_position(chromium_compat_version))
    new_commit = get_chromium_main_commit(
        get_chromium_main_position(chromium_checkout))

    cmd = '%s diff --relative --no-prefix %s..%s -- %s' % (
        git_exe, old_commit, new_commit, ' '.join(config['files']))
    result = exec_cmd(cmd, chromium_src_dir)
    if result['out'] != '':
      write_file(out_file, result['out'])


def check_pattern_matches(output_file=None):
  """ Evaluate the Chromium checkout for pattern matches. """
  config = read_update_file()
  if config is None:
    msg("Skipping Chromium pattern matching.")
    return

  if 'patterns' in config:
    if output_file is None:
      fp = sys.stdout
    else:
      msg('Writing %s' % output_file)
      fp = open(output_file, 'w', encoding='utf-8')

    has_output = False
    for entry in config['patterns']:
      msg("Evaluating pattern: %s" % entry['pattern'])

      # Read patterns from a file to avoid formatting problems.
      pattern_handle, pattern_file = tempfile.mkstemp()
      os.write(pattern_handle, entry['pattern'])
      os.close(pattern_handle)

      cmd = '%s grep -n -f %s' % (git_exe, pattern_file)
      result = exec_cmd(cmd, chromium_src_dir)
      os.remove(pattern_file)

      if result['out'] != '':
        write_msg = True
        re_exclude = re.compile(
            entry['exclude_matches']) if 'exclude_matches' in entry else None

        for line in result['out'].split('\n'):
          line = line.strip()
          if len(line) == 0:
            continue
          skip = not re_exclude is None and re_exclude.match(line) != None
          if not skip:
            if write_msg:
              if has_output:
                write_fp(fp, '\n')
              write_fp(fp,
                       '!!!! WARNING: FOUND PATTERN: %s\n' % entry['pattern'])
              if 'message' in entry:
                write_fp(fp, entry['message'] + '\n')
              write_fp(fp, '\n')
              write_msg = False
            write_fp(fp, line + '\n')
            has_output = True

    if not output_file is None:
      if has_output:
        msg('ERROR Matches found. See %s for output.' % out_file)
      else:
        write_fp(fp, 'Good news! No matches.\n')
      fp.close()

    if has_output:
      # Don't continue when we know the build will be wrong.
      sys.exit(1)

def invalid_options_combination(a, b):
  print("Invalid combination of options: '%s' and '%s'" % (a, b))
  parser.print_help(sys.stderr)
  sys.exit(1)


##
# Program entry point.
##

# Cannot be loaded as a module.
if __name__ != "__main__":
  sys.stderr.write('This file cannot be loaded as a module!')
  sys.exit(1)

# Parse command-line options.
disc = """
This utility implements automation for the download, update, build and
distribution of CEF.
"""

parser = OptionParser(description=disc)

# Setup options.
parser.add_option(
    '--download-dir',
    dest='downloaddir',
    metavar='DIR',
    help='Download directory with no spaces [required].')
parser.add_option(
    '--depot-tools-dir',
    dest='depottoolsdir',
    metavar='DIR',
    help='Download directory for depot_tools.',
    default='')
parser.add_option('--depot-tools-archive', dest='depottoolsarchive',
                  help='Zip archive file that contains a single top-level '+\
                       'depot_tools directory.', default='')
parser.add_option('--branch', dest='branch',
                  help='Branch of CEF to build (master, 3987, ...). This '+\
                       'will be used to name the CEF download directory and '+\
                       'to identify the correct URL if --url is not '+\
                       'specified. The default value is master.',
                  default='master')
parser.add_option('--url', dest='url',
                  help='CEF download URL. If not specified the default URL '+\
                       'will be used.',
                  default='')
parser.add_option('--chromium-url', dest='chromiumurl',
                  help='Chromium download URL. If not specified the default '+\
                       'URL will be used.',
                  default='')
parser.add_option('--checkout', dest='checkout',
                  help='Version of CEF to checkout. If not specified the '+\
                       'most recent remote version of the branch will be used.',
                  default='')
parser.add_option('--chromium-checkout', dest='chromiumcheckout',
                  help='Version of Chromium to checkout (Git '+\
                       'branch/hash/tag). This overrides the value specified '+\
                       'by CEF in CHROMIUM_BUILD_COMPATIBILITY.txt.',
                  default='')

# Miscellaneous options.
parser.add_option(
    '--force-config',
    action='store_true',
    dest='forceconfig',
    default=False,
    help='Force creation of a new gclient config file.')
parser.add_option('--force-clean',
                  action='store_true', dest='forceclean', default=False,
                  help='Force a clean checkout of Chromium and CEF. This will'+\
                       ' trigger a new update, build and distribution.')
parser.add_option('--force-clean-deps',
                  action='store_true', dest='forcecleandeps', default=False,
                  help='Force a clean checkout of Chromium dependencies. Used'+\
                       ' in combination with --force-clean.')
parser.add_option(
    '--dry-run',
    action='store_true',
    dest='dryrun',
    default=False,
    help="Output commands without executing them.")
parser.add_option('--dry-run-platform', dest='dryrunplatform', default=None,
                  help='Simulate a dry run on the specified platform '+\
                       '(windows, mac, linux). Must be used in combination'+\
                       ' with the --dry-run flag.')

# Update-related options.
parser.add_option('--force-update',
                  action='store_true', dest='forceupdate', default=False,
                  help='Force a Chromium and CEF update. This will trigger a '+\
                       'new build and distribution.')
parser.add_option('--no-update',
                  action='store_true', dest='noupdate', default=False,
                  help='Do not update Chromium or CEF. Pass --force-build or '+\
                       '--force-distrib if you desire a new build or '+\
                       'distribution.')
parser.add_option('--no-cef-update',
                  action='store_true', dest='nocefupdate', default=False,
                  help='Do not update CEF. Pass --force-build or '+\
                       '--force-distrib if you desire a new build or '+\
                       'distribution.')
parser.add_option('--force-cef-update',
                  action='store_true', dest='forcecefupdate', default=False,
                  help='Force a CEF update. This will cause local changes in '+\
                       'the CEF checkout to be discarded and patch files to '+\
                       'be reapplied.')
parser.add_option(
    '--no-chromium-update',
    action='store_true',
    dest='nochromiumupdate',
    default=False,
    help='Do not update Chromium.')
parser.add_option(
    '--no-depot-tools-update',
    action='store_true',
    dest='nodepottoolsupdate',
    default=False,
    help='Do not update depot_tools.')
parser.add_option('--fast-update',
                  action='store_true', dest='fastupdate', default=False,
                  help='Update existing Chromium/CEF checkouts for fast incremental '+\
                       'builds by attempting to minimize the number of modified files. '+\
                       'The update will fail if there are unstaged CEF changes or if '+\
                       'Chromium changes are not included in a patch file.')
parser.add_option(
    '--force-patch-update',
    action='store_true',
    dest='forcepatchupdate',
    default=False,
    help='Force update of patch files.')
parser.add_option(
    '--resave',
    action='store_true',
    dest='resave',
    default=False,
    help='Resave patch files.')
parser.add_option(
    '--log-chromium-changes',
    action='store_true',
    dest='logchromiumchanges',
    default=False,
    help='Create a log of the Chromium changes.')

# Build-related options.
parser.add_option('--force-build',
                  action='store_true', dest='forcebuild', default=False,
                  help='Force CEF debug and release builds. This builds '+\
                       '[build-target] on all platforms and chrome_sandbox '+\
                       'on Linux.')
parser.add_option(
    '--no-build',
    action='store_true',
    dest='nobuild',
    default=False,
    help='Do not build CEF.')
parser.add_option(
    '--build-target',
    dest='buildtarget',
    default='cefclient',
    help='Target name(s) to build (defaults to "cefclient").')
parser.add_option(
    '--build-tests',
    action='store_true',
    dest='buildtests',
    default=False,
    help='Also build the test target specified via --test-target.')
parser.add_option(
    '--no-debug-build',
    action='store_true',
    dest='nodebugbuild',
    default=False,
    help="Don't perform the CEF debug build.")
parser.add_option(
    '--no-release-build',
    action='store_true',
    dest='noreleasebuild',
    default=False,
    help="Don't perform the CEF release build.")
parser.add_option(
    '--verbose-build',
    action='store_true',
    dest='verbosebuild',
    default=False,
    help='Show all command lines while building.')
parser.add_option(
    '--build-failure-limit',
    dest='buildfailurelimit',
    default=1,
    type="int",
    help='Keep going until N jobs fail.')
parser.add_option('--build-log-file',
                  action='store_true', dest='buildlogfile', default=False,
                  help='Write build logs to file. The file will be named '+\
                       '"build-[branch]-[debug|release].log" in the download '+\
                       'directory.')
parser.add_option(
    '--x64-build',
    action='store_true',
    dest='x64build',
    default=False,
    help='Create a 64-bit build.')
parser.add_option(
    '--arm-build',
    action='store_true',
    dest='armbuild',
    default=False,
    help='Create an ARM build.')
parser.add_option(
    '--arm64-build',
    action='store_true',
    dest='arm64build',
    default=False,
    help='Create an ARM64 build.')
parser.add_option(
    '--with-pgo-profiles',
    action='store_true',
    dest='withpgoprofiles',
    default=False,
    help='Download PGO profiles for the build.')

# Test-related options.
parser.add_option(
    '--run-tests',
    action='store_true',
    dest='runtests',
    default=False,
    help='Run the ceftests target.')
parser.add_option(
    '--no-debug-tests',
    action='store_true',
    dest='nodebugtests',
    default=False,
    help="Don't run debug build tests.")
parser.add_option(
    '--no-release-tests',
    action='store_true',
    dest='noreleasetests',
    default=False,
    help="Don't run release build tests.")
parser.add_option(
    '--test-target',
    dest='testtarget',
    default='ceftests',
    help='Test target name to build (defaults to "ceftests").')
parser.add_option(
    '--test-prefix',
    dest='testprefix',
    default='',
    help='Prefix for running the test executable (e.g. `xvfb-run` on Linux).')
parser.add_option(
    '--test-args',
    dest='testargs',
    default='',
    help='Arguments that will be passed to the test executable.')

# Distribution-related options.
parser.add_option(
    '--force-distrib',
    action='store_true',
    dest='forcedistrib',
    default=False,
    help='Force creation of a CEF binary distribution.')
parser.add_option(
    '--no-distrib',
    action='store_true',
    dest='nodistrib',
    default=False,
    help="Don't create a CEF binary distribution.")
parser.add_option(
    '--minimal-distrib',
    action='store_true',
    dest='minimaldistrib',
    default=False,
    help='Create a minimal CEF binary distribution.')
parser.add_option(
    '--minimal-distrib-only',
    action='store_true',
    dest='minimaldistribonly',
    default=False,
    help='Create a minimal CEF binary distribution only.')
parser.add_option(
    '--client-distrib',
    action='store_true',
    dest='clientdistrib',
    default=False,
    help='Create a client CEF binary distribution.')
parser.add_option(
    '--client-distrib-only',
    action='store_true',
    dest='clientdistribonly',
    default=False,
    help='Create a client CEF binary distribution only.')
parser.add_option(
    '--sandbox-distrib',
    action='store_true',
    dest='sandboxdistrib',
    default=False,
    help='Create a cef_sandbox static library distribution.')
parser.add_option(
    '--sandbox-distrib-only',
    action='store_true',
    dest='sandboxdistribonly',
    default=False,
    help='Create a cef_sandbox static library distribution only.')
parser.add_option(
    '--no-distrib-docs',
    action='store_true',
    dest='nodistribdocs',
    default=False,
    help="Don't create CEF documentation.")
parser.add_option(
    '--no-distrib-archive',
    action='store_true',
    dest='nodistribarchive',
    default=False,
    help="Don't create archives for output directories.")
parser.add_option(
    '--clean-artifacts',
    action='store_true',
    dest='cleanartifacts',
    default=False,
    help='Clean the artifacts output directory.')
parser.add_option(
    '--distrib-subdir',
    dest='distribsubdir',
    default='',
    help='CEF distrib dir name, child of chromium/src/cef/binary_distrib')
parser.add_option(
    '--distrib-subdir-suffix',
    dest='distribsubdirsuffix',
    default='',
    help='CEF distrib dir name suffix, child of chromium/src/cef/binary_distrib'
)

(options, args) = parser.parse_args()

if options.downloaddir is None:
  print("The --download-dir option is required.")
  parser.print_help(sys.stderr)
  sys.exit(1)

# Opt into component-specific flags for later use.
if options.noupdate:
  options.nocefupdate = True
  options.nochromiumupdate = True
  options.nodepottoolsupdate = True

if options.runtests:
  options.buildtests = True

if (options.nochromiumupdate and options.forceupdate):
    invalid_options_combination('--no-chromium-update', '--force-update')
if (options.nocefupdate and options.forceupdate):
    invalid_options_combination('--no-cef-update', '--force-update')
if (options.nobuild and options.forcebuild):
    invalid_options_combination('--no-build', '--force-build')
if (options.nodistrib and options.forcedistrib):
    invalid_options_combination('--no-distrib', '--force-distrib')
if (options.forceclean and options.fastupdate):
    invalid_options_combination('--force-clean', '--fast-update')
if (options.forcecleandeps and options.fastupdate):
    invalid_options_combination('--force-clean-deps', '--fast-update')

if (options.noreleasebuild and \
     (options.minimaldistrib or options.minimaldistribonly or \
      options.clientdistrib or options.clientdistribonly)) or \
   (options.minimaldistribonly + options.clientdistribonly + options.sandboxdistribonly > 1):
  print('Invalid combination of options.')
  parser.print_help(sys.stderr)
  sys.exit(1)

if options.x64build + options.armbuild + options.arm64build > 1:
  print('Invalid combination of options.')
  parser.print_help(sys.stderr)
  sys.exit(1)

if (options.buildtests or options.runtests) and len(options.testtarget) == 0:
  print("A test target must be specified via --test-target.")
  parser.print_help(sys.stderr)
  sys.exit(1)

# Operating system.
if options.dryrun and options.dryrunplatform is not None:
  platform = options.dryrunplatform
  if not platform in ['windows', 'mac', 'linux']:
    print('Invalid dry-run-platform value: %s' % (platform))
    sys.exit(1)
elif sys.platform == 'win32':
  platform = 'windows'
elif sys.platform == 'darwin':
  platform = 'mac'
elif sys.platform.startswith('linux'):
  platform = 'linux'
else:
  print('Unknown operating system platform')
  sys.exit(1)

if options.clientdistrib or options.clientdistribonly:
  if platform == 'linux' or (platform == 'windows' and options.arm64build):
    client_app = 'cefsimple'
  else:
    client_app = 'cefclient'
  if options.buildtarget.find(client_app) == -1:
    print('A client distribution cannot be generated if --build-target ' +
          'excludes %s.' % client_app)
    parser.print_help(sys.stderr)
    sys.exit(1)

# CEF branch.
cef_branch = options.branch

branch_is_master = (cef_branch == 'master' or cef_branch == 'trunk')
if not branch_is_master:
  # Verify that the branch value is numeric.
  if not cef_branch.isdigit():
    print('Invalid branch value: %s' % cef_branch)
    sys.exit(1)

  # Verify the minimum supported branch number.
  if int(cef_branch) < 3071:
    print('The requested branch (%s) is too old to build using this tool. ' +
          'The minimum supported branch is 3071.' % cef_branch)
    sys.exit(1)

# True if the requested branch is 3538 or newer.
branch_is_3538_or_newer = (branch_is_master or int(cef_branch) >= 3538)

# True if the requested branch is 3945 or newer.
branch_is_3945_or_newer = (branch_is_master or int(cef_branch) >= 3945)

# Enable Python 3 usage in Chromium for branches 3945 and newer.
if branch_is_3945_or_newer and not is_python2 and \
    not 'GCLIENT_PY3' in os.environ.keys():
  os.environ['GCLIENT_PY3'] = '1'

if not branch_is_3945_or_newer and \
  (not is_python2 or bool(int(os.environ.get('GCLIENT_PY3', '0')))):
  print('Python 3 is not supported with branch 3904 and older ' +
        '(set GCLIENT_PY3=0 and run with Python 2 executable).')
  sys.exit(1)

if options.armbuild:
  if platform != 'linux':
    print('The ARM build option is only supported on Linux.')
    sys.exit(1)

deps_file = 'DEPS'

if platform == 'mac' and not (options.x64build or options.arm64build):
  print('32-bit MacOS builds are not supported. ' +
        'Add --x64-build or --arm64-build flag to generate a 64-bit build.')
  sys.exit(1)

# Platforms that build a cef_sandbox library.
sandbox_lib_platforms = ['windows']
if branch_is_3538_or_newer:
  sandbox_lib_platforms.append('mac')

if not platform in sandbox_lib_platforms and (options.sandboxdistrib or
                                              options.sandboxdistribonly):
  print('The sandbox distribution is not supported on this platform.')
  sys.exit(1)

# Options that force the sources to change.
force_change = options.forceclean or options.forceupdate

# Options that cause local changes to be discarded.
discard_local_changes = force_change or options.forcecefupdate

if options.resave and (options.forcepatchupdate or discard_local_changes):
  print('--resave cannot be combined with options that modify or discard ' +
        'patches.')
  parser.print_help(sys.stderr)
  sys.exit(1)

if platform == 'windows':
  # Avoid errors when the "vs_toolchain.py update" Chromium hook runs.
  os.environ['DEPOT_TOOLS_WIN_TOOLCHAIN'] = '0'

download_dir = os.path.abspath(options.downloaddir)
chromium_dir = os.path.join(download_dir, 'chromium')
chromium_src_dir = os.path.join(chromium_dir, 'src')
out_src_dir = os.path.join(chromium_src_dir, 'out')
cef_src_dir = os.path.join(chromium_src_dir, 'cef')

if options.fastupdate and os.path.exists(cef_src_dir):
  cef_dir = cef_src_dir
else:
  cef_dir = os.path.join(download_dir, 'cef')

##
# Manage the download directory.
##

# Create the download directory if necessary.
create_directory(download_dir)

msg("Download Directory: %s" % (download_dir))

##
# Manage the depot_tools directory.
##

# Check if the depot_tools directory exists.
if options.depottoolsdir != '':
  depot_tools_dir = os.path.abspath(options.depottoolsdir)
else:
  depot_tools_dir = os.path.join(download_dir, 'depot_tools')

msg("Depot Tools Directory: %s" % (depot_tools_dir))

if not os.path.exists(depot_tools_dir):
  if platform == 'windows' and options.depottoolsarchive == '':
    # On Windows download depot_tools as an archive file since we can't assume
    # that git is already installed.
    options.depottoolsarchive = depot_tools_archive_url

  if options.depottoolsarchive != '':
    # Extract depot_tools from an archive file.
    msg('Extracting %s to %s.' % \
        (options.depottoolsarchive, depot_tools_dir))
    if not options.dryrun:
      download_and_extract(options.depottoolsarchive, depot_tools_dir)
  else:
    # On Linux and OS X check out depot_tools using Git.
    run('git clone ' + depot_tools_url + ' ' + depot_tools_dir, download_dir)

if not options.nodepottoolsupdate:
  # Update depot_tools.
  # On Windows this will download required python and git binaries.
  msg('Updating depot_tools')
  if platform == 'windows':
    run('update_depot_tools.bat', depot_tools_dir, depot_tools_dir)
  else:
    run('update_depot_tools', depot_tools_dir, depot_tools_dir)

# Determine the executables to use.
if platform == 'windows':
  # Force use of the version bundled with depot_tools.
  git_exe = os.path.join(depot_tools_dir, 'git.bat')
  python_bat = 'python.bat' if is_python2 else 'python3.bat'
  python_exe = os.path.join(depot_tools_dir, python_bat)
  if options.dryrun and not os.path.exists(git_exe):
    sys.stdout.write("WARNING: --dry-run assumes that depot_tools" \
                     " is already in your PATH. If it isn't\nplease" \
                     " specify a --depot-tools-dir value.\n")
    git_exe = 'git.bat'
    python_exe = python_bat
else:
  git_exe = 'git'
  python_exe = sys.executable

##
# Manage the cef directory.
##

# Delete the existing CEF directory if requested.
if options.forceclean and os.path.exists(cef_dir):
  delete_directory(cef_dir)

# Determine the type of CEF checkout to use.
if os.path.exists(cef_dir) and not is_git_checkout(cef_dir):
  raise Exception("Not a valid CEF Git checkout: %s" % (cef_dir))

# Determine the CEF download URL to use.
cef_url = options.url.strip()
if cef_url == '':
  cef_url = cef_git_url

# Verify that the requested CEF URL matches the existing checkout.
if not options.nocefupdate and os.path.exists(cef_dir):
  cef_existing_url = get_git_url(cef_dir)
  if cef_url != cef_existing_url:
    raise Exception(
        'Requested CEF checkout URL %s does not match existing URL %s' %
        (cef_url, cef_existing_url))

msg("CEF Branch: %s" % (cef_branch))
msg("CEF URL: %s" % (cef_url))
msg("CEF Source Directory: %s" % (cef_dir))

# Determine the CEF Git branch to use.
if options.checkout == '':
  # Target the most recent branch commit from the remote repo.
  if branch_is_master:
    cef_checkout = 'origin/master'
  else:
    cef_checkout = 'origin/' + cef_branch
else:
  cef_checkout = options.checkout

# Create the CEF checkout if necessary.
if not options.nocefupdate and not os.path.exists(cef_dir):
  cef_checkout_new = True
  run('%s clone %s %s' % (git_exe, cef_url, cef_dir), download_dir,
      depot_tools_dir)
else:
  cef_checkout_new = False

# Determine if the CEF checkout needs to change.
if not options.nocefupdate and os.path.exists(cef_dir):
  cef_current_hash = get_git_hash(cef_dir, 'HEAD')

  if not cef_checkout_new:
    # Fetch updated sources.
    run('%s fetch' % (git_exe), cef_dir, depot_tools_dir)

  cef_desired_hash = get_git_hash(cef_dir, cef_checkout)
  cef_checkout_changed = cef_checkout_new or force_change or \
                         options.forcecefupdate or \
                         cef_current_hash != cef_desired_hash

  msg("CEF Current Checkout: %s" % (cef_current_hash))
  msg("CEF Desired Checkout: %s (%s)" % (cef_desired_hash, cef_checkout))

  if cef_checkout_changed:
    if cef_dir == cef_src_dir:
      # Running in fast update mode. Backup and revert the patched files before
      # changing the CEF checkout.
      run_patch_updater("--backup --revert")

    # Update the CEF checkout.
    run('%s checkout %s%s' %
      (git_exe, '--force ' if discard_local_changes else '', cef_checkout), \
      cef_dir, depot_tools_dir)
else:
  cef_checkout_changed = False

build_compat_versions = get_build_compat_versions()

if not options.nodepottoolsupdate and \
    'depot_tools_checkout' in build_compat_versions:
  # Update the depot_tools checkout.
  depot_tools_compat_version = build_compat_versions['depot_tools_checkout']
  run('%s checkout %s%s' %
      (git_exe, '--force ' if discard_local_changes else '', depot_tools_compat_version), \
      depot_tools_dir, depot_tools_dir)

# Disable further depot_tools updates.
os.environ['DEPOT_TOOLS_UPDATE'] = '0'

##
# Manage the out directory.
##

out_dir = os.path.join(download_dir, 'out_' + cef_branch)

# Delete the existing out directory if requested.
if options.forceclean and os.path.exists(out_dir):
  delete_directory(out_dir)

msg("CEF Output Directory: %s" % (out_dir))

##
# Manage the chromium directory.
##

# Create the chromium directory if necessary.
create_directory(chromium_dir)

if options.chromiumurl != '':
  chromium_url = options.chromiumurl
else:
  chromium_url = 'https://chromium.googlesource.com/chromium/src.git'

# Create gclient configuration file.
gclient_file = os.path.join(chromium_dir, '.gclient')
if not os.path.exists(gclient_file) or options.forceconfig:
  # Exclude unnecessary directories. Intentionally written without newlines.
  gclient_spec = \
      "solutions = [{"+\
        "'managed': False,"+\
        "'name': 'src', "+\
        "'url': '" + chromium_url + "', "+\
        "'custom_vars': {"+\
          "'checkout_pgo_profiles': " + ('True' if options.withpgoprofiles else 'False') + ", "+\
        "}, "+\
        "'custom_deps': {"+\
          "'build': None, "+\
          "'build/scripts/command_wrapper/bin': None, "+\
          "'build/scripts/gsd_generate_index': None, "+\
          "'build/scripts/private/data/reliability': None, "+\
          "'build/scripts/tools/deps2git': None, "+\
          "'build/third_party/lighttpd': None, "+\
          "'commit-queue': None, "+\
          "'depot_tools': None, "+\
          "'src/chrome_frame/tools/test/reference_build/chrome': None, "+\
          "'src/chrome/tools/test/reference_build/chrome_linux': None, "+\
          "'src/chrome/tools/test/reference_build/chrome_mac': None, "+\
          "'src/chrome/tools/test/reference_build/chrome_win': None, "+\
        "}, "+\
        "'deps_file': '" + deps_file + "', "+\
        "'safesync_url': ''"+\
      "}]"

  msg('Writing %s' % gclient_file)
  if not options.dryrun:
    with open(gclient_file, 'w', encoding='utf-8') as fp:
      write_fp(fp, gclient_spec)

# Initial Chromium checkout.
if not options.nochromiumupdate and not os.path.exists(chromium_src_dir):
  chromium_checkout_new = True
  run("gclient sync --nohooks --with_branch_heads --jobs 16", \
      chromium_dir, depot_tools_dir)
else:
  chromium_checkout_new = False

# Verify the Chromium checkout.
if not options.dryrun and not is_git_checkout(chromium_src_dir):
  raise Exception('Not a valid git checkout: %s' % (chromium_src_dir))

if os.path.exists(chromium_src_dir):
  msg("Chromium URL: %s" % (get_git_url(chromium_src_dir)))

# Fetch Chromium changes so that we can perform the necessary calculations using
# local history.
if not options.nochromiumupdate and os.path.exists(chromium_src_dir):
  # Fetch updated sources.
  run("%s fetch" % (git_exe), chromium_src_dir, depot_tools_dir)
  # Also fetch tags, which are required for release branch builds.
  run("%s fetch --tags" % (git_exe), chromium_src_dir, depot_tools_dir)

# Determine the Chromium checkout options required by CEF.
chromium_compat_version = build_compat_versions['chromium_checkout']
if len(options.chromiumcheckout) > 0:
  chromium_checkout = options.chromiumcheckout
else:
  chromium_checkout = chromium_compat_version

# Determine if the Chromium checkout needs to change.
if not options.nochromiumupdate and os.path.exists(chromium_src_dir):
  chromium_current_hash = get_git_hash(chromium_src_dir, 'HEAD')
  chromium_desired_hash = get_git_hash(chromium_src_dir, chromium_checkout)
  chromium_checkout_changed = chromium_checkout_new or force_change or \
                              chromium_current_hash != chromium_desired_hash

  msg("Chromium Current Checkout: %s" % (chromium_current_hash))
  msg("Chromium Desired Checkout: %s (%s)" % \
      (chromium_desired_hash, chromium_checkout))
else:
  chromium_checkout_changed = options.dryrun

if cef_checkout_changed:
  if cef_dir != cef_src_dir and os.path.exists(cef_src_dir):
    # Delete the existing src/cef directory. It will be re-copied from the
    # download directory later.
    delete_directory(cef_src_dir)
elif chromium_checkout_changed and cef_dir == cef_src_dir:
  # Running in fast update mode. Backup and revert the patched files before
  # changing the Chromium checkout.
  run_patch_updater("--backup --revert")

# Delete the existing src/out directory if requested.
if options.forceclean and os.path.exists(out_src_dir):
  delete_directory(out_src_dir)

# Move the existing src/out directory to the correct location in the download
# directory. It will be moved back from the download directory later.
if os.path.exists(out_src_dir):
  old_branch = read_branch_config_file(out_src_dir)
  if old_branch != '' and (chromium_checkout_changed or
                           old_branch != cef_branch):
    old_out_dir = os.path.join(download_dir, 'out_' + old_branch)
    move_directory(out_src_dir, old_out_dir)

# Update the Chromium checkout.
if chromium_checkout_changed:
  if not chromium_checkout_new and not options.fastupdate:
    if options.forceclean and options.forcecleandeps:
      # Remove all local changes including third-party git checkouts managed by
      # gclient.
      run("%s clean -dffx" % (git_exe), chromium_src_dir, depot_tools_dir)
    else:
      # Revert all changes in the Chromium checkout.
      run("gclient revert --nohooks", chromium_dir, depot_tools_dir)

  # Checkout the requested branch.
  run("%s checkout %s%s" % \
    (git_exe, '--force ' if discard_local_changes else '', chromium_checkout), \
    chromium_src_dir, depot_tools_dir)

  # Patch the Chromium DEPS file if necessary.
  apply_deps_patch()

  # Update third-party dependencies including branch/tag information.
  run("gclient sync %s--nohooks --with_branch_heads --jobs 16" % \
      ('--reset ' if discard_local_changes else ''), chromium_dir, depot_tools_dir)

  # Patch the Chromium runhooks scripts if necessary.
  apply_runhooks_patch()

  # Runs hooks for files that have been modified in the local working copy.
  run("gclient runhooks --jobs 16", chromium_dir, depot_tools_dir)

  # Delete the src/out directory created by `gclient sync`.
  delete_directory(out_src_dir)

if cef_dir == cef_src_dir:
  # Running in fast update mode.
  if cef_checkout_changed or chromium_checkout_changed:
    # Check and restore the patched files.
    run_patch_updater("--reapply --restore")
elif os.path.exists(cef_dir) and not os.path.exists(cef_src_dir):
  # Restore the src/cef directory.
  copy_directory(cef_dir, cef_src_dir)

# Restore the src/out directory.
out_src_dir_exists = os.path.exists(out_src_dir)
if os.path.exists(out_dir) and not out_src_dir_exists:
  move_directory(out_dir, out_src_dir)
  out_src_dir_exists = True
elif not out_src_dir_exists:
  create_directory(out_src_dir)

# Write the config file for identifying the branch.
write_branch_config_file(out_src_dir, cef_branch)

if options.logchromiumchanges and chromium_checkout != chromium_compat_version:
  log_chromium_changes()

if options.forcepatchupdate or ((chromium_checkout_new or not options.fastupdate) and \
                                chromium_checkout_changed and \
                                chromium_checkout != chromium_compat_version):
  # Not using the known-compatible Chromium version. Try to update patch files.
  if options.logchromiumchanges:
    out_file = os.path.join(download_dir, 'chromium_update_patches.txt')
    if os.path.exists(out_file):
      os.remove(out_file)
  else:
    out_file = None
  run_patch_updater(output_file=out_file)
elif options.resave:
  # Resave patch files.
  run_patch_updater("--resave")

if chromium_checkout != chromium_compat_version:
  if options.logchromiumchanges:
    out_file = os.path.join(download_dir, 'chromium_update_patterns.txt')
    if os.path.exists(out_file):
      os.remove(out_file)
  else:
    out_file = None
  check_pattern_matches(output_file=out_file)

##
# Build CEF.
##

if not options.nobuild and (chromium_checkout_changed or \
                            cef_checkout_changed or options.forcebuild or \
                            not out_src_dir_exists):
  # Building should also force a distribution.
  options.forcedistrib = True

  # Make sure the GN configuration exists.
  if not options.dryrun and \
    not os.path.exists(os.path.join(cef_src_dir, 'BUILD.gn')):
    raise Exception('GN configuration does not exist.')

  # Print all build-related environment variables including any that were set
  # previously.
  for key in os.environ.keys():
    if key.startswith('CEF_') or key.startswith('GCLIENT_') or \
       key.startswith('GN_') or key.startswith('GYP_') or \
       key.startswith('DEPOT_TOOLS_'):
      msg('%s=%s' % (key, os.environ[key]))

  # Generate project files.
  tool = os.path.join(cef_src_dir, 'tools', 'gclient_hook.py')
  run('%s %s' % (python_exe, tool), cef_src_dir, depot_tools_dir)

  # Build using Ninja.
  command = 'ninja '
  if options.verbosebuild:
    command += '-v '
  if options.buildfailurelimit != 1:
    command += '-k %d ' % options.buildfailurelimit
  command += '-C '
  target = ' ' + options.buildtarget
  if options.buildtests:
    target += ' ' + options.testtarget
  if platform == 'linux':
    target += ' chrome_sandbox'

  # Make a CEF Debug build.
  if not options.nodebugbuild:
    build_path = os.path.join('out', get_build_directory_name(True))
    args_path = os.path.join(chromium_src_dir, build_path, 'args.gn')
    msg(args_path + ' contents:\n' + read_file(args_path))

    run(command + build_path + target, chromium_src_dir, depot_tools_dir,
        os.path.join(download_dir, 'build-%s-debug.log' % (cef_branch)) \
          if options.buildlogfile else None)

    if platform in sandbox_lib_platforms:
      # Make the separate cef_sandbox build when GN is_official_build=true.
      build_path += '_sandbox'
      if os.path.exists(os.path.join(chromium_src_dir, build_path)):
        args_path = os.path.join(chromium_src_dir, build_path, 'args.gn')
        msg(args_path + ' contents:\n' + read_file(args_path))

        run(command + build_path + ' cef_sandbox', chromium_src_dir, depot_tools_dir,
            os.path.join(download_dir, 'build-%s-debug-sandbox.log' % (cef_branch)) \
              if options.buildlogfile else None)

  # Make a CEF Release build.
  if not options.noreleasebuild:
    build_path = os.path.join('out', get_build_directory_name(False))
    args_path = os.path.join(chromium_src_dir, build_path, 'args.gn')
    msg(args_path + ' contents:\n' + read_file(args_path))

    run(command + build_path + target, chromium_src_dir, depot_tools_dir,
        os.path.join(download_dir, 'build-%s-release.log' % (cef_branch)) \
          if options.buildlogfile else None)

    if platform in sandbox_lib_platforms:
      # Make the separate cef_sandbox build when GN is_official_build=true.
      build_path += '_sandbox'
      if os.path.exists(os.path.join(chromium_src_dir, build_path)):
        args_path = os.path.join(chromium_src_dir, build_path, 'args.gn')
        msg(args_path + ' contents:\n' + read_file(args_path))

        run(command + build_path + ' cef_sandbox', chromium_src_dir, depot_tools_dir,
            os.path.join(download_dir, 'build-%s-release-sandbox.log' % (cef_branch)) \
              if options.buildlogfile else None)

elif not options.nobuild:
  msg('Not building. The source hashes have not changed and ' +
      'the output folder "%s" already exists' % (out_src_dir))

##
# Run CEF tests.
##

if options.runtests:
  if platform == 'windows':
    test_exe = '%s.exe' % options.testtarget
  elif platform == 'mac':
    test_exe = '%s.app/Contents/MacOS/%s' % (options.testtarget,
                                             options.testtarget)
  elif platform == 'linux':
    test_exe = options.testtarget

  test_prefix = options.testprefix
  if len(test_prefix) > 0:
    test_prefix += ' '

  test_args = options.testargs
  if len(test_args) > 0:
    test_args = ' ' + test_args

  if not options.nodebugtests:
    build_path = os.path.join(out_src_dir, get_build_directory_name(True))
    test_path = os.path.join(build_path, test_exe)
    if os.path.exists(test_path):
      run(test_prefix + test_path + test_args, build_path, depot_tools_dir)
    else:
      msg('Not running debug tests. Missing executable: %s' % test_path)

  if not options.noreleasetests:
    build_path = os.path.join(out_src_dir, get_build_directory_name(False))
    test_path = os.path.join(build_path, test_exe)
    if os.path.exists(test_path):
      run(test_prefix + test_path + test_args, build_path, depot_tools_dir)
    else:
      msg('Not running release tests. Missing executable: %s' % test_path)

##
# Create the CEF binary distribution.
##

if not options.nodistrib and (chromium_checkout_changed or \
                              cef_checkout_changed or options.forcedistrib):
  if not options.forceclean and options.cleanartifacts:
    # Clean the artifacts output directory.
    artifacts_path = os.path.join(cef_src_dir, 'binary_distrib')
    delete_directory(artifacts_path)

  # Determine the requested distribution types.
  distrib_types = []
  if options.minimaldistribonly:
    distrib_types.append('minimal')
  elif options.clientdistribonly:
    distrib_types.append('client')
  elif options.sandboxdistribonly:
    distrib_types.append('sandbox')
  else:
    distrib_types.append('standard')
    if options.minimaldistrib:
      distrib_types.append('minimal')
    if options.clientdistrib:
      distrib_types.append('client')
    if options.sandboxdistrib:
      distrib_types.append('sandbox')

  cef_tools_dir = os.path.join(cef_src_dir, 'tools')

  # Create the requested distribution types.
  first_type = True
  for type in distrib_types:
    path = '%s make_distrib.py --output-dir=../binary_distrib/' % python_exe

    if options.nodebugbuild or options.noreleasebuild or type != 'standard':
      path += ' --allow-partial'
    path = path + ' --ninja-build'
    if options.x64build:
      path += ' --x64-build'
    elif options.armbuild:
      path += ' --arm-build'
    elif options.arm64build:
      path += ' --arm64-build'

    if type == 'minimal':
      path += ' --minimal'
    elif type == 'client':
      path += ' --client'
    elif type == 'sandbox':
      path += ' --sandbox'

    if first_type:
      if options.nodistribdocs:
        path += ' --no-docs'
      if options.nodistribarchive:
        path += ' --no-archive'
      first_type = False
    else:
      # Don't create the symbol archives or documentation more than once.
      path += ' --no-symbols --no-docs'

    # Override the subdirectory name of binary_distrib if the caller requested.
    if options.distribsubdir != '':
      path += ' --distrib-subdir=' + options.distribsubdir
    if options.distribsubdirsuffix != '':
      path += ' --distrib-subdir-suffix=' + options.distribsubdirsuffix

    # Create the distribution.
    run(path, cef_tools_dir, depot_tools_dir)