from optparse import make_option

from django.conf import settings

from django.core.management.base import AppCommand, CommandError

from django.core.management.color import no_style

from django.core.management.sql import sql_reset

from django.db import connections, transaction, DEFAULT_DB_ALIAS

class Command(AppCommand):

    option_list = AppCommand.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('--database', action='store', dest='database',

            default=DEFAULT_DB_ALIAS, help='Nominates a database to reset. '

                'Defaults to the "default" database.'),

    )

    help = "Executes ``sqlreset`` for the given app(s) in the current database."

    args = '[appname ...]'

    output_transaction = True

    def handle_app(self, app, **options):

        using = options.get('database', DEFAULT_DB_ALIAS)

        connection = connections[using]

        app_name = app.__name__.split('.')[-2]

        self.style = no_style()

        sql_list = sql_reset(app, self.style, connection)

        if options.get('interactive'):

            confirm = raw_input("""

You have requested a database reset.

This will IRREVERSIBLY DESTROY any data for

the "%s" application in the database "%s".

Are you sure you want to do this?

Type 'yes' to continue, or 'no' to cancel: """ % (app_name, connection.settings_dict['NAME']))

        else:

            confirm = 'yes'

        if confirm == 'yes':

            try:

                cursor = connection.cursor()

                for sql in sql_list:

                    cursor.execute(sql)

            except Exception, e:

                transaction.rollback_unless_managed()

                raise CommandError("""Error: %s couldn't be reset. Possible reasons:

  * The database isn't running or isn't configured correctly.

  * At least one of the database tables doesn't exist.

  * The SQL was invalid.

Hint: Look at the output of 'django-admin.py sqlreset %s'. That's the SQL this command wasn't able to run.

The full error: %s""" % (app_name, app_name, e))

            transaction.commit_unless_managed()

        else:

            print "Reset cancelled."