#!/usr/bin/env python
# Copyright 2013 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Run Manual Test Bisect Tool

An example usage:
tools/run-bisect-manual-test.py -g 201281 -b 201290

On Linux platform, follow the instructions in this document
https://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment
to setup the sandbox manually before running the script. Otherwise the script
fails to launch Chrome and exits with an error.

This script serves a similar function to bisect-builds.py, except it uses
the bisect_perf_regression.py. This means that that it can obtain builds of
Chromium for revisions where builds aren't available in cloud storage.
"""

import os
import subprocess
import sys

CROS_BOARD_ENV = 'BISECT_CROS_BOARD'
CROS_IP_ENV = 'BISECT_CROS_IP'
_TOOLS_DIR = os.path.abspath(os.path.dirname(__file__))
_BISECT_SCRIPT_PATH = os.path.join(
    _TOOLS_DIR, 'auto_bisect', 'bisect_perf_regression.py')

sys.path.append(os.path.join(_TOOLS_DIR, 'telemetry'))
from telemetry.core import browser_options


def _RunBisectionScript(options):
  """Attempts to execute the bisect script (bisect_perf_regression.py).

  Args:
    options: The configuration options to pass to the bisect script.

  Returns:
    An exit code; 0 for success, 1 for failure.
  """
  test_command = ('python %s --browser=%s --chrome-root=.' %
                  (os.path.join(_TOOLS_DIR, 'bisect-manual-test.py'),
                   options.browser_type))

  cmd = ['python', _BISECT_SCRIPT_PATH,
         '-c', test_command,
         '-g', options.good_revision,
         '-b', options.bad_revision,
         '-m', 'manual_test/manual_test',
         '-r', '1',
         '--working_directory', options.working_directory,
         '--build_preference', 'ninja',
         '--use_goma',
         '--no_custom_deps']

  if options.extra_src:
    cmd.extend(['--extra_src', options.extra_src])

  if 'cros' in options.browser_type:
    cmd.extend(['--target_platform', 'cros'])

    if os.environ[CROS_BOARD_ENV] and os.environ[CROS_IP_ENV]:
      cmd.extend(['--cros_board', os.environ[CROS_BOARD_ENV]])
      cmd.extend(['--cros_remote_ip', os.environ[CROS_IP_ENV]])
    else:
      print ('Error: Cros build selected, but BISECT_CROS_IP or'
             'BISECT_CROS_BOARD undefined.\n')
      return 1
  elif 'android-chrome' in options.browser_type:
    cmd.extend(['--target_platform', 'android-chrome'])
  elif 'android' in options.browser_type:
    cmd.extend(['--target_platform', 'android'])
  elif not options.target_build_type:
    cmd.extend(['--target_build_type', options.browser_type.title()])

  if options.target_build_type:
    cmd.extend(['--target_build_type', options.target_build_type])

  cmd = [str(c) for c in cmd]

  return_code = subprocess.call(cmd)

  if return_code:
    print 'Error: bisect_perf_regression.py had exit code %d.' % return_code
    print

  return return_code


def main():
  """Does a bisect based on the command-line arguments passed in.

  The user will be prompted to classify each revision as good or bad.
  """
  usage = ('%prog [options]\n'
           'Used to run the bisection script with a manual test.')

  options = browser_options.BrowserFinderOptions('release')
  parser = options.CreateParser(usage)

  parser.add_option('-b', '--bad_revision',
                    type='str',
                    help='A bad revision to start bisection. ' +
                    'Must be later than good revision. May be either a git' +
                    ' or svn revision.')
  parser.add_option('-g', '--good_revision',
                    type='str',
                    help='A revision to start bisection where performance' +
                    ' test is known to pass. Must be earlier than the ' +
                    'bad revision. May be either a git or svn revision.')
  parser.add_option('-w', '--working_directory',
                    type='str',
                    default='..',
                    help='A working directory to supply to the bisection '
                    'script, which will use it as the location to checkout '
                    'a copy of the chromium depot.')
  parser.add_option('--extra_src',
                    type='str',
                    help='Path to extra source file. If this is supplied, '
                    'bisect script will use this to override default behavior.')
  parser.add_option('--target_build_type',
                     type='choice',
                     choices=['Release', 'Debug'],
                     help='The target build type. Choices are "Release" '
                     'or "Debug".')
  options, _ = parser.parse_args()
  error_msg = ''
  if not options.good_revision:
    error_msg += 'Error: missing required parameter: --good_revision\n'
  if not options.bad_revision:
    error_msg += 'Error: missing required parameter: --bad_revision\n'

  if error_msg:
    print error_msg
    parser.print_help()
    return 1

  if 'android' not in options.browser_type and sys.platform.startswith('linux'):
    if not os.environ.get('CHROME_DEVEL_SANDBOX'):
      print 'SUID sandbox has not been setup.'\
            ' See https://code.google.com/p/chromium/wiki/'\
            'LinuxSUIDSandboxDevelopment for more information.'
      return 1

  return _RunBisectionScript(options)


if __name__ == '__main__':
  sys.exit(main())
