from celery import shared_task
from django.contrib.auth import get_user_model
from django.utils import timezone


@shared_task(name='accounts.tasks.deactivate_expired_users_task')
def deactivate_expired_users_task():
    """Deactivate active users whose active_until timestamp has passed."""
    user_model = get_user_model()
    now = timezone.now()
    updated = user_model.objects.filter(
        is_active=True,
        active_until__isnull=False,
        active_until__lte=now,
    ).update(is_active=False)
    return updated