# -*- coding: utf-8 -*-
from __future__ import unicode_literals

import jdatetime
from django.db.models.signals import post_save, pre_save
from django.dispatch import receiver

from ads.models import Ad


@receiver(pre_save, sender=Ad)
def ad_pre_save_receiver(sender, instance, **kwargs):
    # save publish date if ad's status is changed to: approved
    try:
        obj = sender.objects.get(pk=instance.pk)
    except sender.DoesNotExist:
        pass  # Object is new, so field hasn't technically changed, but you may want to do something else here.
    else:
        if not obj.status == instance.status:  # Field has changed
            if instance.status == 'approved':
                instance.publish_date = jdatetime.datetime.now()


@receiver(post_save, sender=Ad)
def ad_post_save_receiver(sender, instance, created, **kwargs):
    if not instance.publish_date:
        instance.publish_date = jdatetime.datetime.now()
        instance.save()