#!/usr/bin/env python
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"""Unit test utilities for Google C++ Mocking Framework."""

__author__ = 'wan@google.com (Zhanyong Wan)'

import os
import sys

# Determines path to gtest_test_utils and imports it.
SCRIPT_DIR = os.path.dirname(__file__) or '.'

# isdir resolves symbolic links.
gtest_tests_util_dir = os.path.join(SCRIPT_DIR, '../gtest/test')
if os.path.isdir(gtest_tests_util_dir):
  GTEST_TESTS_UTIL_DIR = gtest_tests_util_dir
else:
  GTEST_TESTS_UTIL_DIR = os.path.join(SCRIPT_DIR, '../../gtest/test')

sys.path.append(GTEST_TESTS_UTIL_DIR)
import gtest_test_utils  # pylint: disable-msg=C6204


# Initially maps a flag to its default value.  After
# _ParseAndStripGMockFlags() is called, maps a flag to its actual
# value.
_flag_map = {'gmock_source_dir': os.path.dirname(sys.argv[0]),
             'gmock_build_dir': os.path.dirname(sys.argv[0])}
_gmock_flags_are_parsed = False


def _ParseAndStripGMockFlags(argv):
  """Parses and strips Google Test flags from argv.  This is idempotent."""

  global _gmock_flags_are_parsed
  if _gmock_flags_are_parsed:
    return

  _gmock_flags_are_parsed = True
  for flag in _flag_map:
    # The environment variable overrides the default value.
    if flag.upper() in os.environ:
      _flag_map[flag] = os.environ[flag.upper()]

    # The command line flag overrides the environment variable.
    i = 1  # Skips the program name.
    while i < len(argv):
      prefix = '--' + flag + '='
      if argv[i].startswith(prefix):
        _flag_map[flag] = argv[i][len(prefix):]
        del argv[i]
        break
      else:
        # We don't increment i in case we just found a --gmock_* flag
        # and removed it from argv.
        i += 1


def GetFlag(flag):
  """Returns the value of the given flag."""

  # In case GetFlag() is called before Main(), we always call
  # _ParseAndStripGMockFlags() here to make sure the --gmock_* flags
  # are parsed.
  _ParseAndStripGMockFlags(sys.argv)

  return _flag_map[flag]


def GetSourceDir():
  """Returns the absolute path of the directory where the .py files are."""

  return os.path.abspath(GetFlag('gmock_source_dir'))


def GetBuildDir():
  """Returns the absolute path of the directory where the test binaries are."""

  return os.path.abspath(GetFlag('gmock_build_dir'))


def GetTestExecutablePath(executable_name):
  """Returns the absolute path of the test binary given its name.

  The function will print a message and abort the program if the resulting file
  doesn't exist.

  Args:
    executable_name: name of the test binary that the test script runs.

  Returns:
    The absolute path of the test binary.
  """

  return gtest_test_utils.GetTestExecutablePath(executable_name, GetBuildDir())


def GetExitStatus(exit_code):
  """Returns the argument to exit(), or -1 if exit() wasn't called.

  Args:
    exit_code: the result value of os.system(command).
  """

  if os.name == 'nt':
    # On Windows, os.WEXITSTATUS() doesn't work and os.system() returns
    # the argument to exit() directly.
    return exit_code
  else:
    # On Unix, os.WEXITSTATUS() must be used to extract the exit status
    # from the result of os.system().
    if os.WIFEXITED(exit_code):
      return os.WEXITSTATUS(exit_code)
    else:
      return -1


# Exposes Subprocess from gtest_test_utils.
Subprocess = gtest_test_utils.Subprocess  # pylint: disable-msg=C6409


def Main():
  """Runs the unit test."""

  # We must call _ParseAndStripGMockFlags() before calling
  # gtest_test_utils.Main().  Otherwise unittest.main it calls will be
  # confused by the --gmock_* flags.
  _ParseAndStripGMockFlags(sys.argv)
  gtest_test_utils.Main()