from django.db import models
from main.models import Tag, Activity
from django.db.models.signals import post_save, post_delete

class Post(models.Model):
    subject = models.CharField(max_length=500)
    body = models.TextField()
    tags = models.ManyToManyField(Tag, null=True, blank=True)
    postdate = models.DateTimeField(auto_now=True)

    def __unicode__(self):
        return self.subject

def post_saved_callback(sender, **kwargs):
    if kwargs['created']:
        acttype = 'add'
    else:
        acttype = 'edit'

    a = Activity(actcategory='blog',
                 actdescription=kwargs["instance"].subject,
                 acttype = acttype,
                 objpk = kwargs["instance"].pk)
    a.save()

def post_deleted_callback(sender, **kwargs):
    a = Activity(actcategory='blog',
                 actdescription=kwargs["instance"].subject,
                 acttype = 'delete')
    a.save()

post_save.connect(post_saved_callback, sender=Post)
post_delete.connect(post_deleted_callback, sender=Post)