from django.db.models.signals import post_save, pre_delete, m2m_changed
from django.contrib.auth.models import User, Group
from django.dispatch import receiver
from .models import Profile, Agency, AgencyGroup
from django.contrib.auth.models import Permission
# SIGNALS FOR USER
@receiver(post_save, sender=User)
def create_profile(sender, instance, created, **kwargs):	
	if created:				
		Profile.objects.create(user=instance, agency=instance.agency, parent=instance.parent)
		'''
			Wenn ein neuer Nutzer angelegt wird und dies der erste der Agentur ist, 
			erhält dieser automatisch alle verfügbaren Rechte!
		'''
		user_agency = User.objects.filter(profile__agency__pk=instance.agency.pk)
		if len(user_agency) == 1:
			tempuser = user_agency[0]
			temprof = Profile
			for ele in temprof._meta.permissions:
				tempperm = Permission.objects.get(codename=ele[0])
				tempuser.user_permissions.add(tempperm)	
				#tempuser.profile.func = 'lead'
			tempuser.save()

@receiver(post_save, sender=User)
def save_profile(sender, instance, **kwargs):
	instance.profile.save()


# SIGNALS FOR GROUPS

@receiver(signal=m2m_changed, sender=User.groups.through)
def adjust_group_notifications(instance, action, reverse, model, pk_set, using, *args, **kwargs):
	# USERGROUP IS CHANGED
	if isinstance(instance, Group):
		group_touched = AgencyGroup.objects.get(group=instance)		
		user_touched = User.objects.get(pk=list(pk_set)[0])		
		# A USER WAS REMOVED FROM A GROUP
		if(action == 'post_remove'):		
			print("USER REMOVED " + user_touched.first_name + " FROM GROUP " + group_touched.agencygroupname)
		# A USER WAS ADDED TO A GROUP
		elif(action == 'post_add'):
			print("USER ADDED " + user_touched.first_name + " TO GROUP " + group_touched.agencygroupname)