from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework import status, permissions
from rest_framework.parsers import MultiPartParser, FormParser
from .services import parse_and_import_transactions

class TransactionUploadView(APIView):
    permission_classes = [permissions.IsAuthenticated]
    parser_classes = (MultiPartParser, FormParser)

    def post(self, request):
        if 'file' not in request.FILES:
            return Response({"error": "No file passed"}, status=status.HTTP_400_BAD_REQUEST)
        
        from .utils_mongo import get_user_db_id
        file = request.FILES['file']
        count, error = parse_and_import_transactions(file, get_user_db_id(request.user))
        
        if error:
            return Response({"error": error}, status=status.HTTP_400_BAD_REQUEST)
            
        return Response({"message": f"Successfully processed {count} transactions."}, status=status.HTTP_201_CREATED)