from rest_framework.views import APIView
from rest_framework.renderers import JSONRenderer
from rest_framework.response import Response
from django.db.models import Q
from lms.global_decorators import transaction_decorator

from journals.models import Thread
from journals.serilizers import ThreadUserSerializer, ThreadAdminSerializer


class ThreadAdminListView(APIView):
    renderer_classes = (JSONRenderer,)
    status_code = 200

    def get(self, request):
        return Response(
            [ThreadAdminSerializer(thread).data for thread in Thread.objects.filter(is_staff=True)],
            self.status_code,
        )


class ThreadDetailView(APIView):
    renderer_classes = (JSONRenderer,)
    status_code = 200

    def post(self, request, key):
        try:
            thread = Thread.objects.get(key=key)
            thread.text = request.JSON.get('text', thread.text)
            thread.key = request.JSON.get('key', thread.key)
            thread.x = request.JSON.get('x', thread.x)
            thread.y = request.JSON.get('y', thread.y)
            thread.save()
            return Response(ThreadAdminSerializer(thread).data, self.status_code,)
        except Thread.DoesNotExist:
            return Response("Thread doesn't exist.", self.status_code,)

    def get(self, request, key):
        try:
            return Response(ThreadUserSerializer(Thread.objects.get(key=key)).data, self.status_code)
        except Thread.DoesNotExist:
            return Response("Thread not found", status=404)


class TeacherThreadListView(APIView):
    renderer_classes = (JSONRenderer,)

    @transaction_decorator
    def get(self, request):
        if not request.user.is_authenticated and not 'teachers' in request.user.groups:
            return Response("Permission denied", status=403)
        threads = Thread.objects.filter(Q(subscribers=request.user) | Q(groups__user=request.user))
        return Response([ThreadUserSerializer(i).data for i in threads])