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
from notificsys.models import UserNotification
from django.core.mail import send_mail
from django.template.loader import render_to_string
# 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):

	# IF FALSE NO MAILS WILL BE SEND - IN PRODUCTIVITY CHANGE TO TRUE #
	GLOBALSENDMAILS = True


	# GROUPSETTINGS FOR SOME USER WAS CHANGED
	if isinstance(instance, Group):
		group_touched = AgencyGroup.objects.get(group=instance)		
		user_touched = User.objects.get(pk=list(pk_set)[0])		
		
		# PUSH NOTIFICATION FOR GROUOPCHANGES
		if(user_touched.profile.add_new_group_push):
			if(action == 'post_remove'):
				newnotification = UserNotification(touser=user_touched, notificationtext="Sie wurden aus der Gruppe " + group_touched.agencygroupname + " entfernt.", notificationtype="groupchanges")
				newnotification.save()
			# A USER WAS ADDED TO A GROUP
			elif(action == 'post_add'):
				newnotification = UserNotification(touser=user_touched, notificationtext="Sie wurden zur Gruppe " + group_touched.agencygroupname + " hinzugefügt.", notificationtype="groupchanges")	
				newnotification.save()

		# E-MAILNOTIFICATIONS FOR GROUPCHANGES
		if(user_touched.profile.add_new_group_mail):
			notificationtext = ""
			if(action == 'post_remove'):
				notificationtext = "Sie wurden aus der Gruppe " + group_touched.agencygroupname + " entfernt."
				
				username = user_touched.first_name + " " + user_touched.last_name
				msg_html = render_to_string('notificsys/notification_mail.html', {'username': username, 'notificationtext' : notificationtext})		
				if(GLOBALSENDMAILS):
					send_mail(
					    'Agentur-Benachrichtigung',
					    'Hallo ' + user_touched.first_name + ' ' + user_touched.last_name + '! ' + notificationtext,
					    'support@digitale-agentur.com',
					    [user_touched.email],		    
					    html_message=msg_html,
					    fail_silently=False
					)

			# A USER WAS ADDED TO A GROUP
			elif(action == 'post_add'):
				notificationtext = "Sie wurden zur Gruppe " + group_touched.agencygroupname + " hinzugefügt."

				username = user_touched.first_name + " " + user_touched.last_name
				msg_html = render_to_string('notificsys/notification_mail.html', {'username': username, 'notificationtext' : notificationtext})		
				if(GLOBALSENDMAILS):
					send_mail(
					    'Agentur-Benachrichtigung',
					    'Hallo ' + user_touched.first_name + ' ' + user_touched.last_name + '! ' + notificationtext,
					    'support@digitale-agentur.com',
					    [user_touched.email],		    
					    html_message=msg_html,
					    fail_silently=False
					)