from django.contrib.auth.models import User

from .models import AdminRegistration, Registration


def set_username(instance, **_):
    instance.username = instance.email


def send_email_link(instance, **_):
    if instance.pk:
        old_instance = User.objects.get(pk=instance.pk)
        if old_instance.email != instance.email:
            registration = Registration.objects.get(user=instance)
            registration.email_confirmed = False
            registration.save()
            registration.user = instance
            registration.send_email_validation_link()


def create_admin_registration(instance, **_):
    if instance.is_superuser:
        AdminRegistration.objects.get_or_create(user=instance)