from django.apps import AppConfig
from django.conf import settings
from django.db import OperationalError
from django_scopes import scopes_disabled


class CookbookConfig(AppConfig):
    name = 'cookbook'

    def ready(self):
        # post_save signal is only necessary if using full-text search on postgres
        if settings.DATABASES['default']['ENGINE'] in ['django.db.backends.postgresql_psycopg2', 'django.db.backends.postgresql']:
            import cookbook.signals  # noqa

        # when starting up run fix_tree to:
        #   a) make sure that nodes are sorted when switching between sort modes
        #   b) fix problems, if any, with tree consistency
        with scopes_disabled():
            try:
                from cookbook.models import Keyword, Food
                Keyword.fix_tree(fix_paths=True)
                Food.fix_tree(fix_paths=True)
            except OperationalError:
                pass # if model does not exist there is no need to fix it