from django.db.models.signals import post_save, post_delete, m2m_changed
from django.dispatch import receiver
from utils.cache import invalidate_cache_patterns
from .models import * 

# 1. Define all models that affect the list
# If a Category title changes, the list must update.
# If a Status changes, the list must update.
TARGET_MODELS = [
    Hadis, HadisCategory, HadisCollection, HadisCorrection, HadisInCollection, HadisReference,
    HadisSect, HadisStatus, HadisTag, HadisTransmitter, Transmitters, TransmitterOpinion, TransmitterReliability,
    TransmitterOriginalText, ReferenceImage, BookReference, BookAttribute, BookAuthor, BookReferenceImage,
    NarratorLayer, OpinionStatus, ContentRelease,
    CorrectionReference, BookEdition, BookVolume, CorrectionReferenceImage
]


def invalidate_hadis_cache():
    """
    Deletes all Redis cache keys matching '*hadis_api*'.
    """
    return invalidate_cache_patterns("*hadis_api*")


@receiver(post_save)
@receiver(post_delete)
def clear_hadis_cache(sender, instance, **kwargs):
    """
    Clears the API cache whenever a Hadith or related model is saved/deleted.
    """
    if sender in TARGET_MODELS:
        invalidate_hadis_cache()


@receiver(m2m_changed)
def clear_hadis_cache_on_m2m(sender, instance, action, **kwargs):
    if action in ('post_add', 'post_remove', 'post_clear'):
        if isinstance(instance, tuple(TARGET_MODELS)):
            invalidate_hadis_cache()