from django.shortcuts import get_object_or_404
from rest_framework import generics
from rest_framework.response import Response

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


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):
        usd_cource = UsdCourse.objects.first()
        if not usd_cource:
            usd_cource = UsdCourse.objects.create(value=0)
        old_value = usd_cource.value
        serializer = self.serializer_class(data=request.data)
        if not 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": old_value}, status=200
        )