from django.shortcuts import get_object_or_404

from rest_framework import generics, permissions

from tickets.models import Ticket, TicketList
from tickets.api.serializers import TicketListSerializer, TicketSerializer
from tickets.api.permissions import UserCanReadTicketListPermission


class TicketListListAPIView(generics.ListAPIView):
    permission_classes = [permissions.IsAuthenticated]
    serializer_class = TicketListSerializer

    def get_queryset(self):
        user = self.request.user
        user_groups_ids = user.groups.all().values_list("pk", flat=True)
        ticket_lists  = TicketList.objects.select_related("group").order_by("group__name", "name")

        if not user.is_superuser:
            if user_groups_ids:
                ticket_lists = ticket_lists.filter(group__id__in=user_groups_ids)
            else:
                raise NotFound("You do not yet belong to any groups. Ask your administrator to add you to one.")

        return ticket_lists


class TicketListDetailAPIView(generics.ListAPIView):
    permission_classes = [permissions.IsAuthenticated & UserCanReadTicketListPermission]
    serializer_class = TicketSerializer

    def get_queryset(self):
        tickets = Ticket.objects.all()

        if self.kwargs.get("my"):
            tickets = tickets.filter(assigned_to=self.request.user)     
        else:
            tickets = tickets.filter(ticket_list=self.get_object())

        return tickets

    # FIXME: По какой-то причине появляется ошибка после загрузки страницы redoc
    def get_object(self):
        obj = get_object_or_404(TicketList.objects.filter(pk=self.kwargs['pk']))
        self.check_object_permissions(self.request, obj)
        return obj