#!/usr/bin/env python

import os
import sys
import subprocess
from optparse import OptionParser, BadOptionError, AmbiguousOptionError


APPLICATION = 'mocha'
DEFAULT_ARGS = ['--recursive', '--require', 'should']

REPORT_DIRECTORY = '../../build/log'


class PassThroughOptionParser(OptionParser):
    """
    An unknown option pass-through implementation of OptionParser.

    When unknown arguments are encountered, bundle with largs and try again,
    until rargs is depleted.

    sys.exit(status) will still be called if a known argument is passed
    incorrectly (e.g. missing arguments or bad argument types, etc.)

    Borrowed from: http://stackoverflow.com/a/9307174
    """
    def _process_args(self, largs, rargs, values):
        while rargs:
            try:
                OptionParser._process_args(self, largs, rargs, values)
            except (BadOptionError, AmbiguousOptionError), error:
                largs.append(error.opt_str)


def execute_command(command, return_output=False, shell=False):
    prog = subprocess.Popen(command, shell=shell,
                            stdout=subprocess.PIPE
                                   if return_output
                                   else None)
    return prog.wait() if not return_output else \
           prog.communicate()[0]


def get_report_directory():
    path = os.path.abspath(REPORT_DIRECTORY)

    try:
        os.makedirs(REPORT_DIRECTORY)
    except OSError:
        pass

    return path


def get_script_directory():
    return os.path.dirname(os.path.abspath(sys.argv[0]))


def parse_commandline():
    parser = PassThroughOptionParser(usage='%prog [options] [additional arguments'
                                           ' for {0}]'.format(APPLICATION))
    parser.add_option('-b', '--build', action='store_true',
                      help='Enable reporting.')
    parser.add_option('-v', '--verbose', action='store_true',
                      help='Be more verbose.')
    parser.add_option('-i', '--include', metavar='PATTERN', action='append',
                      help='Include only specific files/test cases.'
                           ' (Can be supplied multiple times.)')
    parser.add_option('-e', '--exclude', metavar='PATTERN', action='append',
                      help='Exclude specific files/test cases. '
                           '(Can be supplied multiple times.)')
    return parser.parse_args()


def main():
    options, arguments = parse_commandline()

    # Environment preparation and verification
    os.chdir(get_script_directory())
    application_path = execute_command('which {0}'.format(APPLICATION),
                                       True, True).strip()
    if not application_path:
        print 'ERROR: {0} not found!'.format(APPLICATION)
        return 2
    os.environ['NODE_PATH'] = os.environ.get('NODE_PATH', '') + \
                              ':/usr/local/lib/node_modules' \
                              ':/usr/local/share/npm/lib/node_modules' \
                              ':/usr/lib/node_modules:./testlib'

    # Commandline preparation
    command_options, more_command_options = [], None
    if options.include or options.exclude:
        for pattern in (options.include or options.exclude):
            command_options.append('--grep')
            command_options.append(pattern)
    if options.exclude:
        command_options.append('--invert')
    if options.build:
        more_command_options = command_options[:len(command_options)] + \
                               ['--reporter', 'mocha-cobertura-reporter']
        command_options.extend(['--reporter', 'xunit'])
    elif options.verbose:
        command_options.extend(['--reporter', 'spec'])
    else:
        command_options.extend(['--reporter', 'nyan'])
    if not any(os.path.isfile(a) or os.path.isdir(a) for a in arguments):
        arguments.append('.')

    # Application invocation..
    if more_command_options is None:
        execute_command([application_path] + DEFAULT_ARGS +
                        command_options + arguments)
    else:
        result_data = execute_command([application_path] + DEFAULT_ARGS +
                                      command_options + arguments, True)
        coverage_data = execute_command([application_path] + DEFAULT_ARGS +
                                        more_command_options + arguments, True)
        # Result storage
        report_directory = get_report_directory()
        result_path = os.path.join(report_directory, 'mocha_results.xml')
        coverage_path = os.path.join(report_directory, 'mocha_coverage.xml')
        with open(result_path, 'w') as result_file:
            result_file.write(result_data)
        with open(coverage_path, 'w') as coverage_file:
            coverage_file.write(coverage_data)

    return 0


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