'''
   This command creates a moderator group with permissions to add, change and delete
   the objects in the exam app.
'''

# django imports
from django.core.management.base import BaseCommand, CommandError
from django.contrib.auth.models import Group, Permission
from django.contrib.contenttypes.models import ContentType
from django.db.utils import IntegrityError

class Command(BaseCommand):
    help = 'Adds the moderator group'

    def handle(self, *args, **options):
        app_label = 'yaksh'
        group = Group(name='moderator')
        try:
            group.save()
        except IntegrityError:
            raise CommandError("The group already exits")
        else:
            # Get the models for the given app
            content_types = ContentType.objects.filter(app_label=app_label)
            # Get list of permissions for the models
            permission_list = Permission.objects.filter(content_type__in=content_types)
            group.permissions.add(*permission_list)
            group.save()

        self.stdout.write('Moderator group added successfully')