from django.contrib.auth.mixins import LoginRequiredMixin
from django.views import View
from django.shortcuts import render
from django.http import JsonResponse
from .chatbot_logic import get_gpt4_response
import json

class ChatbotView(LoginRequiredMixin, View):
    """
    Represents a view for handling chatbot interactions.

    This class handles GET and POST requests for a chatbot interface. It leverages
    `LoginRequiredMixin` to ensure that only authenticated users can access it. On GET
    requests, it renders the chatbot interface, while on POST requests, it interacts
    with a chatbot backend to process user messages and return responses.

    :ivar request: The HTTP request object, providing metadata about the
        current session and user.
    :type request: HttpRequest
    """
    def get(self, request):
        return render(request, "haikalbot/chatbot.html")

    def post(self, request):
        dealer = request.user.dealer

        try:
            data = json.loads(request.body)
            user_message = data.get("message", "").strip()

            if not user_message:
                return JsonResponse({"error": "Message cannot be empty."}, status=400)

            chatbot_response = get_gpt4_response(user_message, dealer)

            return JsonResponse({"response": chatbot_response}, status=200)
        except json.JSONDecodeError:
            return JsonResponse({"error": "Invalid JSON format."}, status=400)