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 news.models import News
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
from tasks.models import Tasks

# Deletes all Notifications added to to delete news
@receiver(pre_delete, sender=News)
def del_news_notifications(sender, instance, **kwargs):
	UserNotification.objects.filter(elementid=instance.pk).delete()	


# SIGNALS FOR USER
'''
@receiver(post_save, sender=User)
def create_profile(sender, instance, created, **kwargs):		
	print(instance)
	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
					)
    
# SIGNAL FOR NEWS



@receiver(post_save, sender=News)
def save_news(sender, instance, **kwargs):
	if(kwargs["created"]):
		usersofagency = User.objects.filter(profile__agency__pk=instance.agency.pk)
		for user in usersofagency:

			if(user.profile.news_mail):
				notificationtext = "Neue Agenturnews: "  + instance.name

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

			if(user.profile.news_push):
				newnotification = UserNotification(touser=user, notificationtext="Neue Agenturnews: " + instance.name, notificationtype="agencynews", elementid=instance.pk)
				newnotification.save()

# SIGNALS FOR TASK
@receiver(signal=m2m_changed, sender=Tasks.usersfield.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

	# A USER WAS TOUCHED ATT HIS TASKS
	user_touched = User.objects.get(pk=list(pk_set)[0])		
	taskname = instance.name

	# PUSH NOTIFICATION FOR GROUOPCHANGES
	if(user_touched.profile.add_task_push):
		if(action == 'post_remove'):
			newnotification = UserNotification(touser=user_touched, notificationtext="Sie wurden von der Tätigkeit " + taskname + " entfernt.", notificationtype="taskchange")
			newnotification.save()
		# A USER WAS ADDED TO A GROUP
		elif(action == 'post_add'):
			newnotification = UserNotification(touser=user_touched, notificationtext="Sie wurden der Tätigkeit " + taskname + " zugeordnet.", notificationtype="taskchange")	
			newnotification.save()

	# E-MAILNOTIFICATIONS FOR GROUPCHANGES
	if(user_touched.profile.add_task_mail):
		notificationtext = ""
		if(action == 'post_remove'):
			notificationtext = "Sie wurden von der Tätigkeit " + taskname + " 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 der Tätigkeit " + taskname + " zugeordnet."

			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
				)