from django.db import transaction
from django.db.models.signals import post_delete
from django.dispatch import receiver

from commerce.models import ProductImage


def _delete_file_after_commit(field_file):
    if not field_file or not field_file.name:
        return
    storage = field_file.storage
    name = field_file.name
    transaction.on_commit(lambda: storage.delete(name))


@receiver(post_delete, sender=ProductImage)
def delete_product_image_files(sender, instance, **kwargs):
    _delete_file_after_commit(instance.file)
    _delete_file_after_commit(instance.thumbnail)