"""App configuration class for the 'users' app."""

import logging

from django.apps import AppConfig
from django.db.utils import OperationalError, ProgrammingError

import InvenTree.ready

logger = logging.getLogger('inventree')


class UsersConfig(AppConfig):
    """Config class for the 'users' app."""

    name = 'users'

    def ready(self):
        """Called when the 'users' app is loaded at runtime."""
        # skip loading if plugin registry is not loaded or we run in a background thread
        if (
            not InvenTree.ready.isPluginRegistryLoaded()
            or not InvenTree.ready.isInMainThread()
        ):
            return

        # Skip if running migrations
        if InvenTree.ready.isRunningMigrations():
            return

        if InvenTree.ready.canAppAccessDatabase(allow_test=True):
            try:
                self.assign_permissions()
            except (OperationalError, ProgrammingError):
                pass

            try:
                self.update_owners()
            except (OperationalError, ProgrammingError):
                pass

    def assign_permissions(self):
        """Update role permissions for existing groups."""
        from django.contrib.auth.models import Group

        from users.models import RuleSet, update_group_roles

        # First, delete any rule_set objects which have become outdated!
        for rule in RuleSet.objects.all():
            if (
                rule.name not in RuleSet.RULESET_NAMES
            ):  # pragma: no cover  # can not change ORM without the app being loaded
                logger.info('Deleting outdated ruleset: %s', rule.name)
                rule.delete()

        # Update group permission assignments for all groups
        for group in Group.objects.all():
            update_group_roles(group)

    def update_owners(self):
        """Create an 'owner' object for each user and group instance."""
        from django.contrib.auth import get_user_model
        from django.contrib.auth.models import Group

        from users.models import Owner

        # Create group owners
        for group in Group.objects.all():
            Owner.create(group)

        # Create user owners
        for user in get_user_model().objects.all():
            Owner.create(user)