from rest_framework import viewsets
from rest_framework.permissions import IsAuthenticated
from rest_framework.exceptions import PermissionDenied

from .models import Notificacion, TipoNotificacion
from .serializers import NotificacionSerializer, TipoNotificacionSerializer
from core.permissions import require_permission


class TipoNotificacionViewSet(viewsets.ModelViewSet):
    queryset = TipoNotificacion.objects.all()
    serializer_class = TipoNotificacionSerializer
    http_method_names = ['get']
    permission_classes = [IsAuthenticated]
    my_tags = ['Notificaciones']

    def get_queryset(self):
        return self.queryset.order_by('tipo')


class NotificacionViewSet(viewsets.ModelViewSet):
    queryset = Notificacion.objects.all()
    serializer_class = NotificacionSerializer
    http_method_names = ['get', 'post', 'put', 'patch', 'delete']
    filterset_fields = ['visto']
    my_tags = ['Notificaciones']

    def get_permissions(self):
        if self.action in ('list', 'retrieve'):
            return [IsAuthenticated(), require_permission('notificaciones.view')()]
        return [IsAuthenticated()]

    def get_queryset(self):
        if getattr(self, 'swagger_fake_view', False):
            return Notificacion.objects.none()
        user = self.request.user
        if not user.is_authenticated:
            return Notificacion.objects.none()
        return Notificacion.objects.filter(dirigido=user)

    def perform_create(self, serializer):
        if not self.request.user.is_authenticated:
            raise PermissionDenied("Usuario no autenticado")
        if self.request.user.is_superuser:
            serializer.save()
            return
        raise PermissionDenied("No tienes permiso para crear notificaciones para otros usuarios")