#from rest_framework.views import APIView
from rest_framework import status
from rest_framework import mixins
from rest_framework import generics
from rest_framework.response import Response
from django.http import Http404
from api.models import Subject
from api.serializers import SubjectSerializer
from api.utils import *


# NOTE: On deployment, most (if not all) POST routes will be removed, to prevent outsiders from changing the Database
class SubjectList(mixins.ListModelMixin,
                  mixins.CreateModelMixin,
                  generics.GenericAPIView):
    queryset = Subject.objects.all()
    serializer_class = SubjectSerializer

    def get(self, request, format=None):
        # subjects = Subject.objects.all()
        # serializer = SubjectSerializer(subjects, many=True)
        # return Response(serializer.data)

        # For now, test the caching capabilities of just the util function
        return Response(fetch_subjects("Math 2"))

    def post(self, request, format=None):
        serializer = SubjectSerializer(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

class SubjectDetail(generics.GenericAPIView):
    def get_object(self, pk):
        try:
            return Subject.objects.get(pk=pk)
        except Subject.DoesNotExist:
            raise Http404

    def get(self, request, pk, format=None):
        subject = self.get_object(pk)
        serializer = SubjectSerializer(subject)
        return Response(serializer.data)

    def put(self, request, pk, format=None):
        subject = self.get_object(pk)
        serializer = SubjectSerializer(subject, data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

    def delete(self, request, pk, format=None):
        subject = self.get_object(pk)
        subject.delete()
        return Response(status=status.HTTP_204_NO_CONTENT)
