from rest_framework import viewsets, permissions, status
from rest_framework.response import Response
from rest_framework.decorators import api_view, permission_classes
from django.contrib.auth import authenticate
from rest_framework_simplejwt.tokens import RefreshToken
from .models import Todo
from .serializers import TodoSerializer, UserSerializer
import logging

logger = logging.getLogger(__name__)

@api_view(['POST'])
@permission_classes([permissions.AllowAny])
def register_user(request):
    serializer = UserSerializer(data=request.data)
    if serializer.is_valid():
        user = serializer.save()
        refresh = RefreshToken.for_user(user)
        return Response({
            'token': str(refresh.access_token),
        })
    return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

@api_view(['POST'])
@permission_classes([permissions.AllowAny])
def login_user(request):
    username = request.data.get('username')
    password = request.data.get('password')
    user = authenticate(username=username, password=password)
    if user:
        refresh = RefreshToken.for_user(user)
        return Response({
            'token': str(refresh.access_token),
        })
    return Response({'error': 'Invalid credentials'}, status=status.HTTP_400_BAD_REQUEST)

class TodoViewSet(viewsets.ModelViewSet):
    serializer_class = TodoSerializer
    permission_classes = [permissions.IsAuthenticated]

    def get_queryset(self):
        print(f"user query: {self.request.user.username}")
        logger.info(f"query by user: {self.request.user.username}")
        return Todo.objects.filter(user=self.request.user)

    def perform_create(self, serializer):
        todo = serializer.save(user=self.request.user)
        serializer.save(user=self.request.user)
        print(f"New todo added - Title: '{todo.title}' by user: {self.request.user.username}")
        logger.info(f"New todo added - Title: '{todo.title}' by user: {self.request.user.username}")