#!/usr/bin/env python
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r"""Tests the text output of Google C++ Mocking Framework.

To update the golden file:
gmock_output_test.py --build_dir=BUILD/DIR --gengolden
where BUILD/DIR contains the built gmock_output_test_ file.
gmock_output_test.py --gengolden
gmock_output_test.py

"""

import os
import re
import sys
from io import open  # pylint: disable=redefined-builtin, g-importing-member

import gmock_test_utils

# The flag for generating the golden file
GENGOLDEN_FLAG = '--gengolden'

PROGRAM_PATH = gmock_test_utils.GetTestExecutablePath('gmock_output_test_')
COMMAND = [PROGRAM_PATH, '--gtest_stack_trace_depth=0', '--gtest_print_time=0']
GOLDEN_NAME = 'gmock_output_test_golden.txt'
GOLDEN_PATH = os.path.join(gmock_test_utils.GetSourceDir(), GOLDEN_NAME)


def ToUnixLineEnding(s):
    """Changes all Windows/Mac line endings in s to UNIX line endings."""

    return s.replace('\r\n', '\n').replace('\r', '\n')


def RemoveReportHeaderAndFooter(output):
    """Removes Google Test result report's header and footer from the output."""

    output = re.sub(r'.*gtest_main.*\n', '', output)
    output = re.sub(r'\[.*\d+ tests.*\n', '', output)
    output = re.sub(r'\[.* test environment .*\n', '', output)
    output = re.sub(r'\[=+\] \d+ tests .* ran.*', '', output)
    output = re.sub(r'.* FAILED TESTS\n', '', output)
    return output


def RemoveLocations(output):
    """Removes all file location info from a Google Test program's output.

    Args:
         output:  the output of a Google Test program.

    Returns:
         output with all file location info (in the form of
         'DIRECTORY/FILE_NAME:LINE_NUMBER: 'or
         'DIRECTORY\\FILE_NAME(LINE_NUMBER): ') replaced by
         'FILE:#: '.
    """

    return re.sub(r'.*[/\\](.+)(\:\d+|\(\d+\))\:', 'FILE:#:', output)


def NormalizeErrorMarker(output):
    """Normalizes the error marker, which is different on Windows vs on Linux."""

    return re.sub(r' error: ', ' Failure\n', output)


def RemoveMemoryAddresses(output):
    """Removes memory addresses from the test output."""

    return re.sub(r'@\w+', '@0x#', output)


def RemoveTestNamesOfLeakedMocks(output):
    """Removes the test names of leaked mock objects from the test output."""

    return re.sub(r'\(used in test .+\) ', '', output)


def GetLeakyTests(output):
    """Returns a list of test names that leak mock objects."""

    # findall() returns a list of all matches of the regex in output.
    # For example, if '(used in test FooTest.Bar)' is in output, the
    # list will contain 'FooTest.Bar'.
    return re.findall(r'\(used in test (.+)\)', output)


def GetNormalizedOutputAndLeakyTests(output):
    """Normalizes the output of gmock_output_test_.

    Args:
      output: The test output.

    Returns:
      A tuple (the normalized test output, the list of test names that have
      leaked mocks).
    """

    output = ToUnixLineEnding(output)
    output = RemoveReportHeaderAndFooter(output)
    output = NormalizeErrorMarker(output)
    output = RemoveLocations(output)
    output = RemoveMemoryAddresses(output)
    return (RemoveTestNamesOfLeakedMocks(output), GetLeakyTests(output))


def GetShellCommandOutput(cmd):
    """Runs a command in a sub-process, and returns its STDOUT in a string."""

    return gmock_test_utils.Subprocess(cmd, capture_stderr=False).output


def GetNormalizedCommandOutputAndLeakyTests(cmd):
    """Runs a command and returns its normalized output and a list of leaky tests.

    Args:
      cmd:  the shell command.
    """

    # Disables exception pop-ups on Windows.
    os.environ['GTEST_CATCH_EXCEPTIONS'] = '1'
    return GetNormalizedOutputAndLeakyTests(GetShellCommandOutput(cmd))


class GMockOutputTest(gmock_test_utils.TestCase):

    def testOutput(self):
        (output, leaky_tests) = GetNormalizedCommandOutputAndLeakyTests(COMMAND)
        golden_file = open(GOLDEN_PATH, 'rb')
        golden = golden_file.read().decode('utf-8')
        golden_file.close()

        # The normalized output should match the golden file.
        self.assertEquals(golden, output)

        # The raw output should contain 2 leaked mock object errors for
        # test GMockOutputTest.CatchesLeakedMocks.
        self.assertEquals(['GMockOutputTest.CatchesLeakedMocks',
                           'GMockOutputTest.CatchesLeakedMocks'],
                          leaky_tests)


if __name__ == '__main__':
    if sys.argv[1:] == [GENGOLDEN_FLAG]:
        (output, _) = GetNormalizedCommandOutputAndLeakyTests(COMMAND)
        golden_file = open(GOLDEN_PATH, 'wb')
        golden_file.write(output)
        golden_file.close()
        # Suppress the error "googletest was imported but a call to its main()
        # was never detected."
        os._exit(0)
    else:
        gmock_test_utils.Main()
