from django.contrib.auth import get_user_model
from django.contrib.auth.models import Group
from rest_framework.response import Response
from rest_framework.exceptions import NotFound
from rest_framework import serializers
from rest_framework.views import APIView
from rest_framework.permissions import IsAuthenticated
from rest_framework_api_key.permissions import HasAPIKey

class UserSerializer(serializers.ModelSerializer):
    class Meta:
        model = get_user_model()
        fields = ['id', 'username', 'email']

class GroupUsersAPIView(APIView):
    permission_classes = [IsAuthenticated | HasAPIKey]

    def get(self, request, group_name):
        try:
            group = Group.objects.get(name=group_name)
        except Group.DoesNotExist:
            raise NotFound(f"Group '{group_name}' not found.")
        
        users = group.user_set.all()
        serializer = UserSerializer(users, many=True)
        return Response(serializer.data)