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  # Copyright 2012 NEC Corporation
  #
  #    Licensed under the Apache License, Version 2.0 (the "License"); you may
  #    not use this file except in compliance with the License. You may obtain
  #    a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #    Unless required by applicable law or agreed to in writing, software
  #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  #    License for the specific language governing permissions and limitations
  #    under the License.
  
  """
  Views for managing Neutron Subnets.
  """
  from django.core.urlresolvers import reverse  # noqa
  from django.utils.translation import ugettext_lazy as _  # noqa
  
  from horizon import exceptions
  from horizon import tabs
  from horizon import workflows
  
  from openstack_dashboard import api
  
  from openstack_dashboard.dashboards.project.networks.subnets \
      import tabs as project_tabs
  from openstack_dashboard.dashboards.project.networks.subnets \
      import workflows as project_workflows
  
  
  class CreateView(workflows.WorkflowView):
      workflow_class = project_workflows.CreateSubnet
  
      def get_object(self):
          if not hasattr(self, "_object"):
              try:
                  network_id = self.kwargs["network_id"]
                  self._object = api.neutron.network_get(self.request,
                                                         network_id)
                  self._object.set_id_as_name_if_empty()
              except Exception:
                  redirect = reverse('horizon:project:networks:index')
                  msg = _("Unable to retrieve network.")
                  exceptions.handle(self.request, msg, redirect=redirect)
          return self._object
  
      def get_initial(self):
          network = self.get_object()
          return {"network_id": self.kwargs['network_id'],
                  "network_name": network.name}
  
  
  class UpdateView(workflows.WorkflowView):
      workflow_class = project_workflows.UpdateSubnet
  
      def _get_object(self, *args, **kwargs):
          if not hasattr(self, "_object"):
              subnet_id = self.kwargs['subnet_id']
              try:
                  self._object = api.neutron.subnet_get(self.request, subnet_id)
              except Exception:
                  redirect = reverse("horizon:project:networks:index")
                  msg = _('Unable to retrieve subnet details')
                  exceptions.handle(self.request, msg, redirect=redirect)
          return self._object
  
      def get_initial(self):
          initial = super(UpdateView, self).get_initial()
  
          subnet = self._get_object()
  
          initial['network_id'] = self.kwargs['network_id']
          initial['subnet_id'] = subnet['id']
          initial['subnet_name'] = subnet['name']
  
          for key in ('cidr', 'ip_version', 'enable_dhcp'):
              initial[key] = subnet[key]
  
          initial['gateway_ip'] = subnet['gateway_ip'] or ''
          initial['no_gateway'] = (subnet['gateway_ip'] is None)
  
          initial['dns_nameservers'] = '\n'.join(subnet['dns_nameservers'])
          pools = ['%s,%s' % (p['start'], p['end'])
                   for p in subnet['allocation_pools']]
          initial['allocation_pools'] = '\n'.join(pools)
          routes = ['%s,%s' % (r['destination'], r['nexthop'])
                   for r in subnet['host_routes']]
          initial['host_routes'] = '\n'.join(routes)
  
          return initial
  
  
  class DetailView(tabs.TabView):
      tab_group_class = project_tabs.SubnetDetailTabs
      template_name = 'project/networks/subnets/detail.html'
  