from django.db.models.signals import post_save, post_delete, m2m_changed
from django.dispatch import receiver
from django.core.cache import cache
from GestionInscriptions.models import FicheInscription, Eleve, Responsable
from GestionLogin.models import Profil
from N3wtSchool import settings
from N3wtSchool.redis_client import redis_client
import logging
logger = logging.getLogger(__name__)

def clear_cache():
    # Préfixes des clés à supprimer
    prefixes = ['N3WT_']

    for prefix in prefixes:
        # Utiliser le motif pour obtenir les clés correspondant au préfixe
        pattern = f'*{prefix}*'
        logger.debug(f'pattern : {pattern}')
        for key in redis_client.scan_iter(pattern):
            redis_client.delete(key)
            logger.debug(f'deleting : {key}')

@receiver(post_save, sender=FicheInscription)
@receiver(post_delete, sender=FicheInscription)
def clear_cache_after_change(sender, instance, **kwargs):
    clear_cache()

@receiver(m2m_changed, sender=Eleve.responsables.through)
def check_orphan_reponsables(sender, **kwargs):
    action = kwargs.pop('action', None)
    instance = kwargs.pop('instance', None)
    # pre_clear : lors de la suppression d'une FI (on fait un "clear" sur chaque relation)
    if action in ('post_remove', 'post_clear'):
        if instance.responsables.all():
            Responsable.objects.filter(eleve=None).delete()

@receiver(m2m_changed, sender=Eleve.profils.through)
def check_orphan_profils(sender, **kwargs):
    action = kwargs.pop('action', None)
    instance = kwargs.pop('instance', None)
    # pre_clear : lors de la suppression d'une FI (on fait un "clear" sur chaque relation)
    if action in ('post_remove', 'post_clear'):
        if instance.profils.all():
            Profil.objects.filter(eleve=None).delete()