from django.conf import settings
from django.core.management.base import BaseCommand
from optparse import make_option, OptionParser
import sys
from django.test.utils import get_runner

class Command(BaseCommand):
    option_list = BaseCommand.option_list + (
        make_option('--noinput', action='store_false', dest='interactive', default=True,
            help='Tells Django to NOT prompt the user for input of any kind.'),
        make_option('--failfast', action='store_true', dest='failfast', default=False,
            help='Tells Django to stop running the test suite after first failed test.'),
        make_option('--testrunner', action='store', dest='testrunner',
            help='Tells Django to use specified test runner class instead of the one '+
                 'specified by the TEST_RUNNER setting.')
    )
    help = 'Runs the test suite for the specified applications, or the entire site if no apps are specified.'
    args = '[appname ...]'

    requires_model_validation = False

    def run_from_argv(self, argv):
        """
        Pre-parse the command line to extract the value of the --testrunner
        option. This allows a test runner to define additional command line
        arguments.
        """
        self.test_runner = None
        option = '--testrunner='
        for arg in argv[2:]:
            if arg.startswith(option):
                self.test_runner = arg[len(option):]
                break
        super(Command, self).run_from_argv(argv)

    def create_parser(self, prog_name, subcommand):
        test_runner_class = get_runner(settings, self.test_runner)
        options = self.option_list + getattr(test_runner_class, 'option_list', ())
        return OptionParser(prog=prog_name,
                            usage=self.usage(subcommand),
                            version=self.get_version(),
                            option_list=options)

    def handle(self, *test_labels, **options):
        from django.conf import settings
        from django.test.utils import get_runner

        TestRunner = get_runner(settings, options.get('testrunner'))
        options['verbosity'] = int(options.get('verbosity'))

        test_runner = TestRunner(**options)
        failures = test_runner.run_tests(test_labels)

        if failures:
            sys.exit(bool(failures))