from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework import authentication, permissions, status
from rest_framework.authentication import SessionAuthentication
from .models import ChannelModel, MemberModel, MessageModel
from django.core import serializers

class ChatView(APIView):
	permission_classes = (permissions.IsAuthenticated,)
	authentication_classes = (SessionAuthentication,)
	
	def get(self, request, pk):
		if (ChannelModel.objects.filter(pk=pk)):
			return Response({'channel_id': pk}, status=status.HTTP_200_OK)
		else:
			return Response("Channel doesn't exist", status=status.HTTP_404_NOT_FOUND)

	def delete(self, request, pk):

		ChannelModel.objects.filter(pk=pk).delete()
		MessageModel.objects.filter(pk=pk).delete()
		MemberModel.objects.filter(pk=pk).delete()

		return Response({'channel_id': pk}, status=status.HTTP_200_OK)

class ChatsView(APIView):
	def post(self, request):

		data: dict = request.data
		users_id = request.data.get("users_id", [])
		if len(users_id) < 2:
			return Response('Not enought members to create the channel', status=status.HTTP_400_BAD_REQUEST)
		if users_id[0] == users_id[1]:
			return Response('Same member', status=status.HTTP_400_BAD_REQUEST)

		for user_id1 in users_id:
			for member1 in MemberModel.objects.filter(member_id=user_id1):
				for user_id2 in users_id:
					if user_id1 == user_id2:
						continue
					for member2 in MemberModel.objects.filter(member_id=user_id2):
						if (member1.channel_id == member2.channel_id):
							messages = MessageModel.objects.filter(channel_id=member1.channel_id).order_by("time")
							messages = serializers.serialize("json", messages) 
							return Response({'channel_id': member1.channel_id, 'messages':messages}, status=status.HTTP_200_OK)
							
		new_channel = ChannelModel()
		new_channel.save()	

		for user_id in users_id:

			new_member = MemberModel()
			new_member.channel_id = new_channel.pk
			new_member.member_id = user_id
			new_member.save()

		return Response({'channel_id': new_channel.pk}, status=status.HTTP_201_CREATED)

	def delete(self, request):

		data: dict = request.data
		users_id = request.data.get("users_id", [])

		#print(list(MemberModel.objects.all()))

		for user_id1 in users_id:
			for member1 in MemberModel.objects.filter(member_id=user_id1):
				for user_id2 in users_id:
					if user_id1 == user_id2:
						break
					for member2 in MemberModel.objects.filter(member_id=user_id2):
						if (member1.channel_id == member2.channel_id):
							MessageModel.objects.filter(channel_id=member1.channel_id).delete()
							member1.delete()
							member2.delete()
							ChannelModel.objects.get(pk=member1.channel_id).delete()
							return Response("Channel removed", status=status.HTTP_200_OK)

		return Response("Channel doesn't exist", status=status.HTTP_404_NOT_FOUND)