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

TARGET_MODELS = [CalendarOccasions]


def invalidate_calendar_cache():
    """
    Invalidates all Redis cache keys for calendar API views.
    """
    return invalidate_cache_patterns("*calendar_api*")


@receiver(post_save)
@receiver(post_delete)
def clear_calendar_cache_on_save_or_delete(sender, instance, **kwargs):
    if sender in TARGET_MODELS:
        invalidate_calendar_cache()