from django.shortcuts import get_object_or_404
from rest_framework.views import APIView
from rest_framework.response import Response
from .models import StudenteCompito

from rest_framework import serializers
from rest_framework import fields

class JSONTextField(fields.CharField):
    def from_native(self, value):
       try:
           value = json.loads(value)
       except ValueError:
           pass
       return super(JSONTextField, self).from_native(value)

class CompitoStudenteSerializer(serializers.Serializer):
    cache = JSONTextField()
    class Meta:
        model = StudenteCompito
        read_only_fields = ('cache',)

class Compito(APIView):
    """
    Torna tutti i risultati per singolo studente del compito
    """
    def get(self, request, compito):
        risultati = StudenteCompito.objects.filter(compito=compito).values('cache')
        serializer = CompitoStudenteSerializer(risultati, many=True)
        return Response(serializer.data)

class CompitoStudente(APIView):
    """
    Torna il risultato del singolo studente del compito
    """
    def get(self, request, compito, studente):
        compito = get_object_or_404(StudenteCompito, compito=compito, studente=studente)
        serializer = CompitoStudenteSerializer(compito)
        return Response(serializer.data)