# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright 2012 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
#
# Copyright 2012 Nebula, Inc.
#
#    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 Nova instances.
"""
import logging

from django import http
from django import shortcuts
from django.core.urlresolvers import reverse
from django.utils.translation import ugettext_lazy as _

from horizon import api
from horizon import exceptions
from horizon import forms
from horizon import tabs
from .forms import UpdateInstance
from .tabs import InstanceDetailTabs


LOG = logging.getLogger(__name__)


def console(request, instance_id):
    try:
        # TODO(jakedahn): clean this up once the api supports tailing.
        tail = request.GET.get('length', None)
        data = api.server_console_output(request,
                                        instance_id,
                                        tail_length=tail)
    except:
        data = _('Unable to get log for instance "%s".') % instance_id
        exceptions.handle(request, ignore=True)
    response = http.HttpResponse(mimetype='text/plain')
    response.write(data)
    response.flush()
    return response


def vnc(request, instance_id):
    try:
        console = api.server_vnc_console(request, instance_id)
        instance = api.server_get(request, instance_id)
        return shortcuts.redirect(console.url +
                ("&title=%s(%s)" % (instance.name, instance_id)))
    except:
        redirect = reverse("horizon:nova:instances_and_volumes:index")
        msg = _('Unable to get VNC console for instance "%s".') % instance_id
        exceptions.handle(request, msg, redirect=redirect)


class UpdateView(forms.ModalFormView):
    form_class = UpdateInstance
    template_name = 'nova/instances_and_volumes/instances/update.html'
    context_object_name = 'instance'

    def get_object(self, *args, **kwargs):
        if not hasattr(self, "object"):
            instance_id = self.kwargs['instance_id']
            try:
                self.object = api.server_get(self.request, instance_id)
            except:
                redirect = reverse("horizon:nova:instances_and_volumes:index")
                msg = _('Unable to retrieve instance details.')
                exceptions.handle(self.request, msg, redirect=redirect)
        return self.object

    def get_initial(self):
        return {'instance': self.kwargs['instance_id'],
                'tenant_id': self.request.user.tenant_id,
                'name': getattr(self.object, 'name', '')}


class DetailView(tabs.TabView):
    tab_group_class = InstanceDetailTabs
    template_name = 'nova/instances_and_volumes/instances/detail.html'

    def get_context_data(self, **kwargs):
        context = super(DetailView, self).get_context_data(**kwargs)
        context["instance"] = self.get_data()
        return context

    def get_data(self):
        if not hasattr(self, "_instance"):
            try:
                instance_id = self.kwargs['instance_id']
                instance = api.server_get(self.request, instance_id)
                instance.volumes = api.volume_instance_list(self.request,
                                                            instance_id)
                instance.full_flavor = api.flavor_get(self.request,
                                                      instance.flavor["id"])
                instance.security_groups = api.server_security_groups(
                                           self.request, instance_id)
            except:
                redirect = reverse('horizon:nova:instances_and_volumes:index')
                exceptions.handle(self.request,
                                  _('Unable to retrieve details for '
                                    'instance "%s".') % instance_id,
                                    redirect=redirect)
            self._instance = instance
        return self._instance

    def get_tabs(self, request, *args, **kwargs):
        instance = self.get_data()
        return self.tab_group_class(request, instance=instance, **kwargs)
