from django.shortcuts import get_object_or_404

from rest_framework import generics
from rest_framework.response import Response

from core.apps.shared.models import UsdCourse
from core.apps.shared.serializers.usd_course import UsdCourseSerializer
from core.apps.accounts.permissions.permissions import HasRolePermission


class UsdCourseApiView(generics.GenericAPIView):
    serializer_class = UsdCourseSerializer
    queryset = UsdCourse.objects.all()
    permission_classes = [HasRolePermission]

    def get(self, request):
        value = UsdCourse.objects.first()
        serializer = self.serializer_class(value)
        return Response(serializer.data, status=200)
    
    def patch(self, request, id):
        usd_cource = get_object_or_404(UsdCourse, id=id)
        serializer = self.serializer_class(data=request.data)
        if serializer.is_valid():
            return Response(serializer.errors, status=400)
        value = serializer.validated_data.get('value')
        usd_cource.value = value
        usd_cource.save()
        return Response({'new_value': usd_cource.value, 'old_value': value}, status=200)