from django.contrib.auth import get_user_model
from django.db.models.signals import post_save
from django.dispatch import receiver

from queues.models import UserQueue
from queues.services import get_default_queue

User = get_user_model()


@receiver(post_save, sender=User)
def create_default_queue(sender, instance, created, **kwargs):
    """Create a UserQueue object when a User gets created."""
    if created:
        user_queue, user_queue_created = UserQueue.objects.get_or_create(user=instance)
        if user_queue_created:
            user_queue.queue = get_default_queue()
            user_queue.save()