import uuid

from django.db.models.signals import post_save
from django.dispatch import receiver

from apps.users.models import User


@receiver(post_save, sender=User)
def ensure_username_on_registration(sender, instance, created, **kwargs):
    if created and not instance.username:
        instance.username = str(uuid.uuid4())[:10]
        instance.save(update_fields=["username"])