#!/usr/bin/env python3
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##
## Copyright (C) 2018 The Qt Company Ltd.
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## GNU General Public License Usage
## Alternatively, this file may be used under the terms of the GNU
## General Public License version 3 as published by the Free Software
## Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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from argparse import ArgumentParser

import os
import re
import subprocess
import sys
import typing


def _parse_commandline():
    parser = ArgumentParser(description='Calculate the conversion rate to cmake.')
    parser.add_argument('--debug', dest='debug', action='store_true',
                        help='Turn on debug output')
    parser.add_argument('source_directory', metavar='<Source Directory>', type=str,
                        help='The Qt module source directory')
    parser.add_argument('binary_directory', metavar='<CMake build direcotry>', type=str,
                        help='The CMake build directory (might be empty)')

    return parser.parse_args()


def calculate_baseline(source_directory: str, *, debug: bool=False) -> int:
    if debug:
        print('Scanning "{}" for qmake-based tests.'.format(source_directory))
    result = subprocess.run('/usr/bin/git grep -E "^\\s*CONFIG\\s*\\+?=.*\\btestcase\\b" | sort -u | wc -l',
        shell=True, capture_output=True, cwd=source_directory)
    return int(result.stdout)


def build(source_directory: str, binary_directory: str, *, debug=False) -> None:
    abs_source = os.path.abspath(source_directory)
    if not os.path.isdir(binary_directory):
        os.makedirs(binary_directory)
    if not os.path.exists(os.path.join(binary_directory, 'CMakeCache.txt')):

        if debug:
            print('Running cmake in "{}".'.format(binary_directory))
        result = subprocess.run(['/usr/bin/cmake', '-GNinja', abs_source], cwd=binary_directory)
        if debug:
            print('CMake return code: {}.'.format(result.returncode))

        assert result.returncode == 0

    if debug:
        print('Running ninja in "{}".'.format(binary_directory))
    result = subprocess.run('/usr/bin/ninja', cwd=binary_directory)
    if debug:
        print('Ninja return code: {}.'.format(result.returncode))

    assert result.returncode == 0


def test(binary_directory: str, *, debug=False) -> typing.Tuple[int, int]:
    if debug:
        print('Running ctest in "{}".'.format(binary_directory))
    result = subprocess.run('/usr/bin/ctest -j 250 | grep "tests passed, "',
                            shell=True, capture_output=True, cwd=binary_directory)
    summary = result.stdout.decode('utf-8').replace('\n', '')
    if debug:
        print('Test summary: {} ({}).'.format(summary, result.returncode))

    matches = re.fullmatch(r'\d+% tests passed, (\d+) tests failed out of (\d+)', summary)
    if matches:
        if debug:
            print('Matches: failed {}, total {}.'.format(matches.group(1), matches.group(2)))
        return (int(matches.group(2)), int(matches.group(2)) - int(matches.group(1)), )

    return (0, 0,)


def main() -> int:
    args = _parse_commandline()

    base_line = calculate_baseline(args.source_directory, debug=args.debug)
    if base_line <= 0:
        print('Could not find the qmake baseline in {}.'.format(args.source_directory))
        return 1

    if args.debug:
        print('qmake baseline: {} test binaries.'.format(base_line))

    cmake_total = 0
    cmake_success = 0
    try:
        build(args.source_directory, args.binary_directory, debug=args.debug)
        (cmake_total, cmake_success, ) = test(args.binary_directory, debug=args.debug)
    finally:
        if cmake_total == 0:
            print('\n\n\nCould not calculate the cmake state.')
            return 2
        else:
            print('\n\n\nCMake test conversion rate: {:.2%}.'.format(cmake_total / base_line))
            print('CMake test success rate   : {:.2%}.'.format(cmake_success / base_line))
            return 0


if __name__ == '__main__':
    main()