#!/usr/bin/env python
# Copyright 2014 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.

"""Convenience script for expect_tests"""

assert __name__ == '__main__'

import os
import subprocess
import sys


INFRA_ROOT = os.path.dirname(os.path.abspath(__file__))


# Whitelist of packages to test on Windows.
WIN_ENABLED_PACKAGES = [
  'infra/libs/buildbot',
  'infra/libs/decorators',
  'infra/libs/gitiles',
  'infra/libs/process_invocation',
  'infra/libs/service_utils',
  'infra/libs/state_machine',

  'infra/services/service_manager',

  'packages/infra_libs/infra_libs/event_mon',
  'packages/infra_libs/infra_libs/infra_types',
  'packages/infra_libs/infra_libs/logs',
  'packages/infra_libs/infra_libs/time_functions',
  'packages/infra_libs/infra_libs/ts_mon',
]


def usage():
  print """\nUsage: %s <action> [<test names>] [<expect_tests options>]

  where <action> is one of: list, test, train, debug.

  Examples:
  Run all tests:
    ./test.py test
  Run all tests in the given package:
    ./test.py test infra
    ./test.py test appengine/cr-buildbucket
  Run all tests and generate an HTML report:
    ./test.py test infra --html-report /path/to/report/folder
  Run one given test in the infra package:
    ./test.py test infra/libs/git2/test:*testCommitBogus

  See expect_tests documentation for more details
  """ % sys.argv[0]


def get_modules_with_coveragerc(root_module):
  """Returns submodules that have .coveragerc file present."""
  root_dir = os.path.join(INFRA_ROOT, root_module.replace('/', os.sep))
  if not os.path.isdir(root_dir):
    return []
  return [
    '%s/%s' % (root_module, d)
    for d in os.listdir(root_dir)
    if os.path.isfile(os.path.join(root_dir, d, '.coveragerc'))
  ]


# Parse command-line arguments
if len(sys.argv) == 1:
  usage()
  sys.exit(1)
else:
  if not sys.argv[1] in ('list', 'train', 'test', 'debug'):
    usage()
    sys.exit(1)

if sys.platform == 'win32':
  python_bin = os.path.join('ENV', 'Scripts', 'python')
  expect_tests_path = os.path.join('ENV', 'Scripts', 'expect_tests')
else:
  python_bin = os.path.join('ENV', 'bin', 'python')
  expect_tests_path = os.path.join('ENV', 'bin', 'expect_tests')

command = sys.argv[1]
args = sys.argv[2:]

modules = []
flags = []
# BUG: this will append everything after the first flag to `flags`. Thus,
# it fails to catch when (a) someone doesn't pass a directory after
# "--html-report", nor (b) if they pass multiple directories after that
# flag.
for arg in args:
  if arg.startswith('-'):
    flags.append(arg)
    continue
  if flags:
    flags.append(arg)
  else:
    modules.append(arg)

# Set up default list of packages/directories if none have been provided.
if not modules:
  # On Windows, test only whitelisted subset of 'infra' and 'packages' modules.
  if sys.platform == 'win32':
    modules.extend([
      p for p in WIN_ENABLED_PACKAGES
      if os.path.isdir(os.path.join(INFRA_ROOT, p))
    ])
  else:
    modules.extend(['infra'])
    modules.extend(get_modules_with_coveragerc('packages'))

  # Test shared GAE code and individual GAE apps only on 64-bit Posix. This
  # matches GAE environment. Skip this if running tests when testing
  # infra_python CIPD package integrity: the package doesn't have appengine
  # code in it.
  if os.path.isdir(os.path.join(INFRA_ROOT, 'appengine')):
    test_gae = sys.platform != 'win32' and sys.maxsize == (2 ** 63) - 1
    if test_gae:
      modules.append('appengine_module')
      modules.extend(get_modules_with_coveragerc('appengine'))

os.environ['PYTHONPATH'] = ''
os.chdir(INFRA_ROOT)
if '--help' not in flags and '-h' not in flags:
  subprocess.check_call(
      [python_bin, os.path.join('bootstrap', 'remove_orphaned_pycs.py')])
else:
  usage()
  sys.exit(subprocess.call([python_bin, expect_tests_path, command, '--help']))

if sys.platform == 'win32' and '--force-coverage' not in flags:
  flags.append('--no-coverage')

exit_code = 0
failed_modules = []
for module in modules:
  print 'Running %s...' % module
  module_flags = flags[:]
  # Remove any test glob, which comes after semicolon (:) and convert to a path.
  module_path = module.split(':')[0].replace('/', os.sep)
  if not any(flag.startswith('--coveragerc') for flag in module_flags):
    module_coveragerc = os.path.join(INFRA_ROOT, module_path, '.coveragerc')
    module_flags.append('--coveragerc=%s' % module_coveragerc)
  if not any(flag.startswith('--html-report-subdir') for flag in module_flags):
    module_flags.append('--html-report-subdir=%s' % module_path)
  cmd = [python_bin, expect_tests_path, command, module] + module_flags
  module_exit_code = subprocess.call(cmd)
  exit_code = module_exit_code or exit_code
  if module_exit_code:
    failed_modules.append(module)

if exit_code:
  print
  print 'Tests failed in modules:\n  %s' % '\n  '.join(failed_modules)
  if '--html-report' not in flags:
    print '\nFor detailed coverage report and per-line branch coverage,'
    print 'rerun with --html-report <dir>'
else:
  print 'All tests passed.'

sys.exit(exit_code)