from __future__ import unicode_literals

from optparse import make_option

from django.core.management.base import AppCommand
from django.core.management.sql import check_for_migrations
from django.db import connections, DEFAULT_DB_ALIAS


class Command(AppCommand):
    help = 'Prints the SQL statements for resetting sequences for the given app name(s).'

    option_list = AppCommand.option_list + (
        make_option('--database', action='store', dest='database',
            default=DEFAULT_DB_ALIAS, help='Nominates a database to print the '
                'SQL for.  Defaults to the "default" database.'),

    )

    output_transaction = True

    def handle_app_config(self, app_config, **options):
        if app_config.models_module is None:
            return
        connection = connections[options.get('database')]
        check_for_migrations(app_config, connection)
        models = app_config.get_models(include_auto_created=True)
        statements = connection.ops.sequence_reset_sql(self.style, models)
        return '\n'.join(statements)