from django.contrib.auth.models import User, Permission
from django.db import transaction
from django.db.models.signals import post_save
from django.dispatch import receiver

from deployment.models import DeploymentUser


@receiver(post_save, sender=User)
def user_created_callback(sender, instance: User, created, **kwargs):
    if created:
        try:
            with transaction.atomic():
                if not instance.is_superuser:
                    permission = Permission.objects.get(
                        codename="view_event",
                        content_type__app_label="django_eventstream",
                    )
                    instance.user_permissions.add(permission)
                    permission.save()

                user = DeploymentUser(
                    user=instance, credits=-1 if instance.is_superuser else 3
                )
                user.save()
        except Exception as e:
            print(f"deployment user creation failed: {e}")