import logging

from django.urls import reverse_lazy
from django.contrib.auth.decorators import login_required
from django.contrib.admin.utils import NestedObjects
from django.utils.decorators import method_decorator
from django.views.generic import ListView, DetailView, CreateView, DeleteView, UpdateView
from guardian.decorators import permission_required_or_403
from guardian.shortcuts import assign_perm

from config import models, forms

logger = logging.getLogger(__name__)


@method_decorator(login_required, name='dispatch')
@method_decorator(permission_required_or_403('config.add_stream'),
                  name='dispatch')
class StreamList(ListView):
    model = models.Stream


@method_decorator(login_required, name='dispatch')
@method_decorator(permission_required_or_403('config.view_stream',
                  (models.Stream, 'pk', 'pk')),
                  name='dispatch')
class StreamDetail(DetailView):
    model = models.Stream

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["srs_nodes"] = models.SRSNode.objects.all()
        return context


@method_decorator(login_required, name='dispatch')
@method_decorator(permission_required_or_403('config.change_stream',
                  (models.Stream, 'pk', 'pk')),
                  name='dispatch')
class StreamChange(UpdateView):
    model = models.Stream
    template_name_suffix = '_update_form'
    fields = ['name']


@method_decorator(login_required, name='dispatch')
@method_decorator(permission_required_or_403('config.add_stream'),
                  name='dispatch')
class StreamCreate(CreateView):
    model = models.Stream
    fields = ['name']

    def form_valid(self, form):
        valid = super().form_valid(form)
        if valid:
            user = self.request.user
            assign_perm('view_stream', user, self.object)
            assign_perm('change_stream', user, self.object)
            assign_perm('delete_stream', user, self.object)
        return valid


@method_decorator(login_required, name='dispatch')
@method_decorator(permission_required_or_403('config.delete_stream',
                  (models.Stream, 'pk', 'pk')),
                  name='dispatch')
class StreamDelete(DeleteView):
    model = models.Stream
    success_url = reverse_lazy('config:stream_list')

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)

        collector = NestedObjects(using='default')
        collector.collect([self.object])

        context['to_delete'] = collector.nested()

        print(context['to_delete'])
        return context