# Copyright 2014 Budapest University of Technology and Economics (BME IK)
#
# This file is part of CIRCLE Cloud.
#
# CIRCLE is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# CIRCLE is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along
# with CIRCLE.  If not, see <http://www.gnu.org/licenses/>.

from __future__ import unicode_literals, absolute_import

from os import getenv
import json
import logging
import re
import requests

from django.conf import settings
from django.contrib.auth.models import User, Group
from django.contrib.auth.views import login, redirect_to_login
from django.contrib.messages import warning
from django.core.exceptions import (
    PermissionDenied, SuspiciousOperation,
)
from django.core import signing
from django.core.urlresolvers import reverse, reverse_lazy
from django.db.models import Count
from django.http import HttpResponse, HttpResponseRedirect, Http404
from django.shortcuts import redirect, render, get_object_or_404
from django.views.decorators.http import require_GET
from django.views.generic.detail import SingleObjectMixin
from django.views.generic import (TemplateView, DetailView, View, DeleteView,
                                  UpdateView, CreateView, ListView)
from django.contrib import messages
from django.utils.translation import ugettext as _
from django.utils.translation import ungettext as __
from django.template.defaultfilters import title as title_filter
from django.template.loader import render_to_string
from django.template import RequestContext

from django.forms.models import inlineformset_factory
from django_tables2 import SingleTableView
from braces.views import LoginRequiredMixin, SuperuserRequiredMixin
from braces.views._access import AccessMixin

from .forms import (
    CircleAuthenticationForm, DiskAddForm, HostForm, LeaseForm, MyProfileForm,
    NodeForm, TemplateForm, TraitForm, VmCustomizeForm, GroupCreateForm,
    CirclePasswordChangeForm
)

from .tables import (
    NodeListTable, NodeVmListTable, TemplateListTable, LeaseListTable,
    GroupListTable,
)
from vm.models import (
    Instance, instance_activity, InstanceActivity, InstanceTemplate, Interface,
    InterfaceTemplate, Lease, Node, NodeActivity, Trait,
)
from storage.models import Disk
from firewall.models import Vlan, Host, Rule
from .models import Favourite, Profile, GroupProfile

logger = logging.getLogger(__name__)


def search_user(keyword):
    try:
        return User.objects.get(username=keyword)
    except User.DoesNotExist:
        try:
            return User.objects.get(profile__org_id=keyword)
        except User.DoesNotExist:
            return User.objects.get(email=keyword)


# github.com/django/django/blob/stable/1.6.x/django/contrib/messages/views.py
class SuccessMessageMixin(object):
    """
    Adds a success message on successful form submission.
    """
    success_message = ''

    def form_valid(self, form):
        response = super(SuccessMessageMixin, self).form_valid(form)
        success_message = self.get_success_message(form.cleaned_data)
        if success_message:
            messages.success(self.request, success_message)
        return response

    def get_success_message(self, cleaned_data):
        return self.success_message % cleaned_data


class IndexView(LoginRequiredMixin, TemplateView):
    template_name = "dashboard/index.html"

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

        # instances
        favs = Instance.objects.filter(favourite__user=self.request.user)
        instances = Instance.get_objects_with_level(
            'user', user, disregard_superuser=True).filter(destroyed_at=None)
        display = list(favs) + list(set(instances) - set(favs))
        for d in display:
            d.fav = True if d in favs else False
        context.update({
            'instances': display[:5],
            'more_instances': instances.count() - len(instances[:5])
        })

        running = instances.filter(status='RUNNING')
        stopped = instances.exclude(status__in=('RUNNING', 'NOSTATE'))

        context.update({
            'running_vms': running[:20],
            'running_vm_num': running.count(),
            'stopped_vm_num': stopped.count()
        })

        # nodes
        if user.is_superuser:
            nodes = Node.objects.all()
            context.update({
                'nodes': nodes[:5],
                'more_nodes': nodes.count() - len(nodes[:5]),
                'sum_node_num': nodes.count(),
                'node_num': {
                    'running': Node.get_state_count(True, True),
                    'missing': Node.get_state_count(False, True),
                    'disabled': Node.get_state_count(True, False),
                    'offline': Node.get_state_count(False, False)
                }
            })

        # groups
        if user.has_module_perms('auth'):
            profiles = GroupProfile.get_objects_with_level('operator', user)
            groups = Group.objects.filter(groupprofile__in=profiles)
            context.update({
                'groups': groups[:5],
                'more_groups': groups.count() - len(groups[:5]),
            })

        # template
        if user.has_perm('vm.create_template'):
            context['templates'] = InstanceTemplate.get_objects_with_level(
                'operator', user).all()[:5]

        return context


def get_vm_acl_data(obj):
    levels = obj.ACL_LEVELS
    users = obj.get_users_with_level()
    users = [{'user': u, 'level': l} for u, l in users]
    groups = obj.get_groups_with_level()
    groups = [{'group': g, 'level': l} for g, l in groups]
    return {'users': users, 'groups': groups, 'levels': levels,
            'url': reverse('dashboard.views.vm-acl', args=[obj.pk])}


def get_group_acl_data(obj):
    aclobj = obj.profile
    levels = aclobj.ACL_LEVELS
    users = aclobj.get_users_with_level()
    users = [{'user': u, 'level': l} for u, l in users]
    groups = aclobj.get_groups_with_level()
    groups = [{'group': g, 'level': l} for g, l in groups]
    return {'users': users, 'groups': groups, 'levels': levels,
            'url': reverse('dashboard.views.group-acl', args=[obj.pk])}


class CheckedDetailView(LoginRequiredMixin, DetailView):
    read_level = 'user'

    def get_has_level(self):
        return self.object.has_level

    def get_context_data(self, **kwargs):
        context = super(CheckedDetailView, self).get_context_data(**kwargs)
        if not self.get_has_level()(self.request.user, self.read_level):
            raise PermissionDenied()
        return context


class VmDetailVncTokenView(CheckedDetailView):
    template_name = "dashboard/vm-detail.html"
    model = Instance

    def get(self, request, **kwargs):
        self.object = self.get_object()
        if not self.object.has_level(request.user, 'operator'):
            raise PermissionDenied()
        if self.object.node:
            with instance_activity(code_suffix='console-accessed',
                                   instance=self.object, user=request.user,
                                   concurrency_check=False):
                port = self.object.vnc_port
                host = str(self.object.node.host.ipv4)
                value = signing.dumps({'host': host, 'port': port},
                                      key=getenv("PROXY_SECRET", 'asdasd')),
                return HttpResponse('vnc/?d=%s' % value)
        else:
            raise Http404()


class VmDetailView(CheckedDetailView):
    template_name = "dashboard/vm-detail.html"
    model = Instance

    def get_context_data(self, **kwargs):
        context = super(VmDetailView, self).get_context_data(**kwargs)
        instance = context['instance']
        context.update({
            'graphite_enabled': VmGraphView.get_graphite_url() is not None,
            'vnc_url': reverse_lazy("dashboard.views.detail-vnc",
                                    kwargs={'pk': self.object.pk}),
            'ops': get_operations(instance, self.request.user),
        })

        # activity data
        context['activities'] = self.object.get_activities(self.request.user)

        context['vlans'] = Vlan.get_objects_with_level(
            'user', self.request.user
        ).exclude(  # exclude already added interfaces
            pk__in=Interface.objects.filter(
                instance=self.get_object()).values_list("vlan", flat=True)
        ).all()
        context['acl'] = get_vm_acl_data(instance)
        context['forms'] = {
            'disk_add_form': DiskAddForm(
                user=self.request.user,
                is_template=False, object_pk=self.get_object().pk,
                prefix="disk"),
        }
        context['os_type_icon'] = instance.os_type.replace("unknown",
                                                           "question")
        return context

    def post(self, request, *args, **kwargs):
        if (request.POST.get('ram-size') and request.POST.get('cpu-count')
                and request.POST.get('cpu-priority')):
            return self.__set_resources(request)

        options = {
            'change_password': self.__change_password,
            'new_name': self.__set_name,
            'new_description': self.__set_description,
            'new_tag': self.__add_tag,
            'to_remove': self.__remove_tag,
            'port': self.__add_port,
            'new_network_vlan': self.__new_network,
            'abort_operation': self.__abort_operation,
        }
        for k, v in options.iteritems():
            if request.POST.get(k) is not None:
                return v(request)

    def __change_password(self, request):
        self.object = self.get_object()
        if not self.object.has_level(request.user, 'owner'):
            raise PermissionDenied()

        self.object.change_password(user=request.user)
        messages.success(request, _("Password changed."))
        if request.is_ajax():
            return HttpResponse("Success.")
        else:
            return redirect(reverse_lazy("dashboard.views.detail",
                                         kwargs={'pk': self.object.pk}))

    def __set_resources(self, request):
        self.object = self.get_object()
        if not self.object.has_level(request.user, 'owner'):
            raise PermissionDenied()
        if not request.user.has_perm('vm.change_resources'):
            raise PermissionDenied()

        resources = {
            'num_cores': request.POST.get('cpu-count'),
            'ram_size': request.POST.get('ram-size'),
            'max_ram_size': request.POST.get('ram-size'),  # TODO: max_ram
            'priority': request.POST.get('cpu-priority')
        }
        Instance.objects.filter(pk=self.object.pk).update(**resources)

        success_message = _("Resources successfully updated.")
        if request.is_ajax():
            response = {'message': success_message}
            return HttpResponse(
                json.dumps(response),
                content_type="application/json"
            )
        else:
            messages.success(request, success_message)
            return redirect(reverse_lazy("dashboard.views.detail",
                                         kwargs={'pk': self.object.pk}))

    def __set_name(self, request):
        self.object = self.get_object()
        if not self.object.has_level(request.user, 'owner'):
            raise PermissionDenied()
        new_name = request.POST.get("new_name")
        Instance.objects.filter(pk=self.object.pk).update(
            **{'name': new_name})

        success_message = _("VM successfully renamed.")
        if request.is_ajax():
            response = {
                'message': success_message,
                'new_name': new_name,
                'vm_pk': self.object.pk
            }
            return HttpResponse(
                json.dumps(response),
                content_type="application/json"
            )
        else:
            messages.success(request, success_message)
            return redirect(self.object.get_absolute_url())

    def __set_description(self, request):
        self.object = self.get_object()
        if not self.object.has_level(request.user, 'owner'):
            raise PermissionDenied()

        new_description = request.POST.get("new_description")
        Instance.objects.filter(pk=self.object.pk).update(
            **{'description': new_description})

        success_message = _("VM description successfully updated.")
        if request.is_ajax():
            response = {
                'message': success_message,
                'new_description': new_description,
            }
            return HttpResponse(
                json.dumps(response),
                content_type="application/json"
            )
        else:
            messages.success(request, success_message)
            return redirect(self.object.get_absolute_url())

    def __add_tag(self, request):
        new_tag = request.POST.get('new_tag')
        self.object = self.get_object()
        if not self.object.has_level(request.user, 'owner'):
            raise PermissionDenied()

        if len(new_tag) < 1:
            message = u"Please input something."
        elif len(new_tag) > 20:
            message = u"Tag name is too long."
        else:
            self.object.tags.add(new_tag)

        try:
            messages.error(request, message)
        except:
            pass

        return redirect(reverse_lazy("dashboard.views.detail",
                                     kwargs={'pk': self.object.pk}))

    def __remove_tag(self, request):
        try:
            to_remove = request.POST.get('to_remove')
            self.object = self.get_object()
            if not self.object.has_level(request.user, 'owner'):
                raise PermissionDenied()

            self.object.tags.remove(to_remove)
            message = u"Success"
        except:  # note this won't really happen
            message = u"Not success"

        if request.is_ajax():
            return HttpResponse(
                json.dumps({'message': message}),
                content_type="application=json"
            )
        else:
            return redirect(reverse_lazy("dashboard.views.detail",
                            kwargs={'pk': self.object.pk}))

    def __add_port(self, request):
        object = self.get_object()
        if (not object.has_level(request.user, 'owner') or
                not request.user.has_perm('vm.config_ports')):
            raise PermissionDenied()

        port = request.POST.get("port")
        proto = request.POST.get("proto")

        try:
            error = None
            interfaces = object.interface_set.all()
            host = Host.objects.get(pk=request.POST.get("host_pk"),
                                    interface__in=interfaces)
            host.add_port(proto, private=port)
        except Host.DoesNotExist:
            logger.error('Tried to add port to nonexistent host %d. User: %s. '
                         'Instance: %s', request.POST.get("host_pk"),
                         unicode(request.user), object)
            raise PermissionDenied()
        except ValueError:
            error = _("There is a problem with your input.")
        except Exception as e:
            error = _("Unknown error.")
            logger.error(e)

        if request.is_ajax():
            pass
        else:
            if error:
                messages.error(request, error)
            return redirect(reverse_lazy("dashboard.views.detail",
                                         kwargs={'pk': self.get_object().pk}))

    def __new_network(self, request):
        self.object = self.get_object()
        if not self.object.has_level(request.user, 'owner'):
            raise PermissionDenied()

        vlan = get_object_or_404(Vlan, pk=request.POST.get("new_network_vlan"))
        if not vlan.has_level(request.user, 'user'):
            raise PermissionDenied()
        try:
            self.object.add_interface(vlan=vlan, user=request.user)
            messages.success(request, _("Successfully added new interface."))
        except Exception, e:
            error = u' '.join(e.messages)
            messages.error(request, error)

        return redirect("%s#network" % reverse_lazy(
            "dashboard.views.detail", kwargs={'pk': self.object.pk}))

    def __abort_operation(self, request):
        self.object = self.get_object()

        activity = get_object_or_404(InstanceActivity,
                                     pk=request.POST.get("activity"))
        if not activity.is_abortable_for(request.user):
            raise PermissionDenied()
        activity.abort()
        return redirect("%s#activity" % self.object.get_absolute_url())


class OperationView(DetailView):

    template_name = 'dashboard/operate.html'

    @property
    def name(self):
        return self.get_op().name

    @property
    def description(self):
        return self.get_op().description

    @classmethod
    def get_urlname(cls):
        return 'dashboard.vm.op.%s' % cls.op

    def get_url(self):
        return reverse(self.get_urlname(), args=(self.get_object().pk, ))

    def get_wrapper_template_name(self):
        if self.request.is_ajax():
            return 'dashboard/_modal.html'
        else:
            return 'dashboard/_base.html'

    @classmethod
    def get_op_by_object(cls, obj):
        return getattr(obj, cls.op)

    def get_op(self):
        if not hasattr(self, '_opobj'):
            setattr(self, '_opobj', getattr(self.get_object(), self.op))
        return self._opobj

    def get_context_data(self, **kwargs):
        ctx = super(OperationView, self).get_context_data(**kwargs)
        ctx['op'] = self.get_op()
        ctx['url'] = self.request.path
        return ctx

    def get(self, request, *args, **kwargs):
        self.get_op().check_auth(request.user)
        response = super(OperationView, self).get(request, *args, **kwargs)
        response.render()
        response.content = render_to_string(self.get_wrapper_template_name(),
                                            {'body': response.content})
        return response

    def post(self, request, extra=None, *args, **kwargs):
        self.object = self.get_object()
        if extra is None:
            extra = {}
        try:
            self.get_op().async(user=request.user, **extra)
        except Exception as e:
            messages.error(request, _('Could not start operation.'))
            logger.error(e)
        return redirect("%s#activity" % self.object.get_absolute_url())

    @classmethod
    def factory(cls, op, icon='cog'):
        return type(str(cls.__name__ + op),
                    (cls, ), {'op': op, 'icon': icon})

    @classmethod
    def bind_to_object(cls, instance):
        v = cls()
        v.get_object = lambda: instance
        return v


class VmOperationView(OperationView):

    model = Instance
    context_object_name = 'instance'  # much simpler to mock object


class VmMigrateView(VmOperationView):

    op = 'migrate'
    icon = 'truck'
    template_name = 'dashboard/_vm-migrate.html'

    def get_context_data(self, **kwargs):
        ctx = super(VmMigrateView, self).get_context_data(**kwargs)
        ctx['nodes'] = [n for n in Node.objects.filter(enabled=True)
                        if n.state == "ONLINE"]
        return ctx

    def post(self, request, extra=None, *args, **kwargs):
        if extra is None:
            extra = {}
        node = self.request.POST.get("node")
        if node:
            node = get_object_or_404(Node, pk=node)
            extra["to_node"] = node
        return super(VmMigrateView, self).post(request, extra, *args, **kwargs)


class VmSaveView(VmOperationView):

    op = 'save_as_template'
    icon = 'save'
    template_name = 'dashboard/_vm-save.html'

    def get_context_data(self, **kwargs):
        ctx = super(VmSaveView, self).get_context_data(**kwargs)
        ctx['name'] = self.get_op()._rename(self.object.name)
        return ctx

    def post(self, request, extra=None, *args, **kwargs):
        if extra is None:
            extra = {}
        name = self.request.POST.get("name")
        if name:
            extra["name"] = name
        return super(VmSaveView, self).post(request, extra, *args, **kwargs)


vm_ops = {
    'reset': VmOperationView.factory(op='reset', icon='bolt'),
    'deploy': VmOperationView.factory(op='deploy', icon='play'),
    'migrate': VmMigrateView,
    'reboot': VmOperationView.factory(op='reboot', icon='refresh'),
    'shut_off': VmOperationView.factory(op='shut_off', icon='ban-circle'),
    'shutdown': VmOperationView.factory(op='shutdown', icon='off'),
    'save_as_template': VmSaveView,
    'destroy': VmOperationView.factory(op='destroy', icon='remove'),
    'sleep': VmOperationView.factory(op='sleep', icon='moon'),
    'wake_up': VmOperationView.factory(op='wake_up', icon='sun'),
}


def get_operations(instance, user):
    ops = []
    for k, v in vm_ops.iteritems():
        try:
            op = v.get_op_by_object(instance)
            op.check_auth(user)
            op.check_precond()
        except:
            pass  # unavailable
        else:
            ops.append(v.bind_to_object(instance))
    return ops


class NodeDetailView(LoginRequiredMixin, SuperuserRequiredMixin, DetailView):
    template_name = "dashboard/node-detail.html"
    model = Node
    form = None
    form_class = TraitForm

    def get_context_data(self, form=None, **kwargs):
        if form is None:
            form = self.form_class()
        context = super(NodeDetailView, self).get_context_data(**kwargs)
        instances = Instance.active.filter(node=self.object)
        context['table'] = NodeVmListTable(instances)
        na = NodeActivity.objects.filter(
            node=self.object, parent=None
        ).order_by('-started').select_related()
        context['activities'] = na
        context['trait_form'] = form
        context['graphite_enabled'] = (
            NodeGraphView.get_graphite_url() is not None)
        return context

    def post(self, request, *args, **kwargs):
        if request.POST.get('new_name'):
            return self.__set_name(request)
        if request.POST.get('to_remove'):
            return self.__remove_trait(request)
        return redirect(reverse_lazy("dashboard.views.node-detail",
                                     kwargs={'pk': self.get_object().pk}))

    def __set_name(self, request):
        self.object = self.get_object()
        new_name = request.POST.get("new_name")
        Node.objects.filter(pk=self.object.pk).update(
            **{'name': new_name})

        success_message = _("Node successfully renamed.")
        if request.is_ajax():
            response = {
                'message': success_message,
                'new_name': new_name,
                'node_pk': self.object.pk
            }
            return HttpResponse(
                json.dumps(response),
                content_type="application/json"
            )
        else:
            messages.success(request, success_message)
            return redirect(reverse_lazy("dashboard.views.node-detail",
                                         kwargs={'pk': self.object.pk}))

    def __remove_trait(self, request):
        try:
            to_remove = request.POST.get('to_remove')
            self.object = self.get_object()
            self.object.traits.remove(to_remove)
            message = u"Success"
        except:  # note this won't really happen
            message = u"Not success"

        if request.is_ajax():
            return HttpResponse(
                json.dumps({'message': message}),
                content_type="application/json"
            )
        else:
            return redirect(self.object.get_absolute_url())


class GroupDetailView(CheckedDetailView):
    template_name = "dashboard/group-detail.html"
    model = Group
    read_level = 'operator'

    def get_has_level(self):
        return self.object.profile.has_level

    def get_context_data(self, **kwargs):
        context = super(GroupDetailView, self).get_context_data(**kwargs)
        context['group'] = self.object
        context['users'] = self.object.user_set.all()
        context['acl'] = get_group_acl_data(self.object)
        return context

    def post(self, request, *args, **kwargs):
        self.object = self.get_object()
        if not self.get_has_level()(request.user, 'operator'):
            raise PermissionDenied()
        if request.POST.get('new_name'):
            return self.__set_name(request)
        if request.POST.get('list-new-name'):
            return self.__add_user(request)
        if request.POST.get('list-new-namelist'):
            return self.__add_list(request)
        if (request.POST.get('list-new-name') is not None) and \
                (request.POST.get('list-new-namelist') is not None):
            return redirect(reverse_lazy("dashboard.views.group-detail",
                                         kwargs={'pk': self.get_object().pk}))

    def __add_user(self, request):
        name = request.POST['list-new-name']
        self.__add_username(request, name)
        return redirect(reverse_lazy("dashboard.views.group-detail",
                                     kwargs={'pk': self.object.pk}))

    def __add_username(self, request, name):
        if not name:
            return
        try:
            entity = User.objects.get(username=name)
            self.object.user_set.add(entity)
        except User.DoesNotExist:
            warning(request, _('User "%s" not found.') % name)

    def __add_list(self, request):
        if not self.get_has_level()(request.user, 'operator'):
            raise PermissionDenied()
        userlist = request.POST.get('list-new-namelist').split('\r\n')
        for line in userlist:
            self.__add_username(request, line)
        return redirect(reverse_lazy("dashboard.views.group-detail",
                                     kwargs={'pk': self.object.pk}))

    def __set_name(self, request):
        new_name = request.POST.get("new_name")
        Group.objects.filter(pk=self.object.pk).update(
            **{'name': new_name})

        success_message = _("Group successfully renamed.")
        if request.is_ajax():
            response = {
                'message': success_message,
                'new_name': new_name,
                'group_pk': self.object.pk
            }
            return HttpResponse(
                json.dumps(response),
                content_type="application/json"
            )
        else:
            messages.success(request, success_message)
            return redirect(reverse_lazy("dashboard.views.group-detail",
                                         kwargs={'pk': self.object.pk}))


class AclUpdateView(LoginRequiredMixin, View, SingleObjectMixin):

    def post(self, request, *args, **kwargs):
        instance = self.get_object()
        if not (instance.has_level(request.user, "owner") or
                getattr(instance, 'owner', None) == request.user):
            logger.warning('Tried to set permissions of %s by non-owner %s.',
                           unicode(instance), unicode(request.user))
            raise PermissionDenied()
        self.set_levels(request, instance)
        self.remove_levels(request, instance)
        self.add_levels(request, instance)
        return redirect("%s#access" % instance.get_absolute_url())

    def set_levels(self, request, instance):
        for key, value in request.POST.items():
            m = re.match('perm-([ug])-(\d+)', key)
            if m:
                typ, id = m.groups()
                entity = {'u': User, 'g': Group}[typ].objects.get(id=id)
                if getattr(instance, "owner", None) == entity:
                    logger.info("Tried to set owner's acl level for %s by %s.",
                                unicode(instance), unicode(request.user))
                    continue
                instance.set_level(entity, value)
                logger.info("Set %s's acl level for %s to %s by %s.",
                            unicode(entity), unicode(instance),
                            value, unicode(request.user))

    def remove_levels(self, request, instance):
        for key, value in request.POST.items():
            if key.startswith("remove"):
                typ = key[7:8]  # len("remove-")
                id = key[9:]  # len("remove-x-")
                entity = {'u': User, 'g': Group}[typ].objects.get(id=id)
                if getattr(instance, "owner", None) == entity:
                    logger.info("Tried to remove owner from %s by %s.",
                                unicode(instance), unicode(request.user))
                    msg = _("The original owner cannot be removed, however "
                            "you can transfer ownership.")
                    messages.warning(request, msg)
                    continue
                instance.set_level(entity, None)
                logger.info("Revoked %s's access to %s by %s.",
                            unicode(entity), unicode(instance),
                            unicode(request.user))

    def add_levels(self, request, instance):
        name = request.POST['perm-new-name']
        value = request.POST['perm-new']
        if not name:
            return
        try:
            entity = User.objects.get(username=name)
        except User.DoesNotExist:
            entity = None
            try:
                entity = Group.objects.get(name=name)
            except Group.DoesNotExist:
                warning(request, _('User or group "%s" not found.') % name)
                return

        instance.set_level(entity, value)
        logger.info("Set %s's new acl level for %s to %s by %s.",
                    unicode(entity), unicode(instance),
                    value, unicode(request.user))


class TemplateAclUpdateView(AclUpdateView):
    model = InstanceTemplate

    def post(self, request, *args, **kwargs):
        template = self.get_object()
        if not (template.has_level(request.user, "owner") or
                getattr(template, 'owner', None) == request.user):
            logger.warning('Tried to set permissions of %s by non-owner %s.',
                           unicode(template), unicode(request.user))
            raise PermissionDenied()

        name = request.POST['perm-new-name']
        if (User.objects.filter(username=name).count() +
                Group.objects.filter(name=name).count() < 1
                and len(name) > 0):
            warning(request, _('User or group "%s" not found.') % name)
        else:
            self.set_levels(request, template)
            self.add_levels(request, template)
            self.remove_levels(request, template)

            post_for_disk = request.POST.copy()
            post_for_disk['perm-new'] = 'user'
            request.POST = post_for_disk
            for d in template.disks.all():
                self.add_levels(request, d)

        return redirect(template)


class GroupAclUpdateView(AclUpdateView):
    model = Group

    def post(self, request, *args, **kwargs):
        instance = self.get_object().profile
        if not (instance.has_level(request.user, "owner") or
                getattr(instance, 'owner', None) == request.user):
            logger.warning('Tried to set permissions of %s by non-owner %s.',
                           unicode(instance), unicode(request.user))
            raise PermissionDenied()
        name = request.POST['perm-new-name']
        if (User.objects.filter(username=name).count() +
                Group.objects.filter(name=name).count() < 1
                and len(name) > 0):
            warning(request, _('User or group "%s" not found.') % name)
        else:
            self.set_levels(request, instance)
            self.add_levels(request, instance)
        return redirect(reverse("dashboard.views.group-detail",
                                kwargs=self.kwargs))


class TemplateChoose(TemplateView):

    def get_template_names(self):
        if self.request.is_ajax():
            return ['dashboard/modal-wrapper.html']
        else:
            return ['dashboard/nojs-wrapper.html']

    def get_context_data(self, *args, **kwargs):
        context = super(TemplateChoose, self).get_context_data(*args, **kwargs)
        templates = InstanceTemplate.get_objects_with_level("user",
                                                            self.request.user)
        context.update({
            'box_title': _('Choose template'),
            'ajax_title': False,
            'template': "dashboard/_template-choose.html",
            'templates': templates.all(),
        })
        return context

    def post(self, request, *args, **kwargs):
        if not request.user.has_perm('vm.create_template'):
            raise PermissionDenied()

        template = request.POST.get("parent")
        if template == "base_vm":
            return redirect(reverse("dashboard.views.template-create"))
        elif template is None:
            messages.warning(request, _("Select an option to proceed."))
            return redirect(reverse("dashboard.views.template-choose"))
        else:
            template = get_object_or_404(InstanceTemplate, pk=template)

        instance = Instance.create_from_template(
            template=template, owner=request.user, is_base=True)

        return redirect(instance.get_absolute_url())


class TemplateCreate(SuccessMessageMixin, CreateView):
    model = InstanceTemplate
    form_class = TemplateForm

    def get_template_names(self):
        if self.request.is_ajax():
            pass
        else:
            return ['dashboard/nojs-wrapper.html']

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

        context.update({
            'box_title': _("Create a new base VM"),
            'template': "dashboard/_template-create.html",
            'leases': Lease.objects.count()
        })
        return context

    def get(self, *args, **kwargs):
        if not self.request.user.has_perm('vm.create_template'):
            raise PermissionDenied()

        return super(TemplateCreate, self).get(*args, **kwargs)

    def get_form_kwargs(self):
        kwargs = super(TemplateCreate, self).get_form_kwargs()
        kwargs['user'] = self.request.user
        return kwargs

    def post(self, request, *args, **kwargs):
        if not self.request.user.has_perm('vm.create_template'):
            raise PermissionDenied()

        form = self.form_class(request.POST, user=request.user)
        if not form.is_valid():
            return self.get(request, form, *args, **kwargs)
        else:
            post = form.cleaned_data
            networks = self.__create_networks(post.pop("networks"),
                                              request.user)
            post.pop("parent")
            post['max_ram_size'] = post['ram_size']
            req_traits = post.pop("req_traits")
            tags = post.pop("tags")
            post['pw'] = User.objects.make_random_password()
            post['is_base'] = True
            inst = Instance.create(params=post, disks=[],
                                   networks=networks,
                                   tags=tags, req_traits=req_traits)

            return redirect("%s#resources" % inst.get_absolute_url())

        return super(TemplateCreate, self).post(self, request, args, kwargs)

    def __create_networks(self, vlans, user):
        networks = []
        for v in vlans:
            if not v.has_level(user, "user"):
                raise PermissionDenied()
            networks.append(InterfaceTemplate(vlan=v, managed=v.managed))
        return networks

    def get_success_url(self):
        return reverse_lazy("dashboard.views.template-list")


class TemplateDetail(LoginRequiredMixin, SuccessMessageMixin, UpdateView):
    model = InstanceTemplate
    template_name = "dashboard/template-edit.html"
    form_class = TemplateForm
    success_message = _("Successfully modified template.")

    def get(self, request, *args, **kwargs):
        template = self.get_object()
        if not template.has_level(request.user, 'user'):
            raise PermissionDenied()
        if request.is_ajax():
            template = {
                'num_cores': template.num_cores,
                'ram_size': template.ram_size,
                'priority': template.priority,
                'arch': template.arch,
                'description': template.description,
                'system': template.system,
                'name': template.name,
                'disks': [{'pk': d.pk, 'name': d.name}
                          for d in template.disks.all()],
                'network': [
                    {'vlan_pk': i.vlan.pk, 'vlan': i.vlan.name,
                     'managed': i.managed}
                    for i in InterfaceTemplate.objects.filter(
                        template=self.get_object()).all()
                ]
            }
            return HttpResponse(json.dumps(template),
                                content_type="application/json")
        else:
            return super(TemplateDetail, self).get(request, *args, **kwargs)

    def get_context_data(self, **kwargs):
        obj = self.get_object()
        context = super(TemplateDetail, self).get_context_data(**kwargs)
        context['acl'] = get_vm_acl_data(obj)
        context['disks'] = obj.disks.all()
        context['disk_add_form'] = DiskAddForm(
            user=self.request.user,
            is_template=True,
            object_pk=obj.pk,
            prefix="disk",
        )
        return context

    def get_success_url(self):
        return reverse_lazy("dashboard.views.template-detail",
                            kwargs=self.kwargs)

    def post(self, request, *args, **kwargs):
        template = self.get_object()
        if not template.has_level(request.user, 'owner'):
            raise PermissionDenied()
        for disk in self.get_object().disks.all():
            if not disk.has_level(request.user, 'user'):
                raise PermissionDenied()
        for network in self.get_object().interface_set.all():
            if not network.vlan.has_level(request.user, "user"):
                raise PermissionDenied()
        return super(TemplateDetail, self).post(self, request, args, kwargs)

    def get_form_kwargs(self):
        kwargs = super(TemplateDetail, self).get_form_kwargs()
        kwargs['user'] = self.request.user
        return kwargs


class TemplateList(LoginRequiredMixin, SingleTableView):
    template_name = "dashboard/template-list.html"
    model = InstanceTemplate
    table_class = TemplateListTable
    table_pagination = False

    def get_context_data(self, *args, **kwargs):
        context = super(TemplateList, self).get_context_data(*args, **kwargs)
        context['lease_table'] = LeaseListTable(Lease.objects.all(),
                                                request=self.request)
        return context

    def get_queryset(self):
        logger.debug('TemplateList.get_queryset() called. User: %s',
                     unicode(self.request.user))
        return InstanceTemplate.get_objects_with_level(
            'user', self.request.user).all()


class TemplateDelete(LoginRequiredMixin, DeleteView):
    model = InstanceTemplate

    def get_success_url(self):
        return reverse("dashboard.views.template-list")

    def get_template_names(self):
        if self.request.is_ajax():
            return ['dashboard/confirm/ajax-delete.html']
        else:
            return ['dashboard/confirm/base-delete.html']

    def delete(self, request, *args, **kwargs):
        object = self.get_object()
        if not object.has_level(request.user, 'owner'):
            raise PermissionDenied()

        object.delete()
        success_url = self.get_success_url()
        success_message = _("Template successfully deleted.")

        if request.is_ajax():
            return HttpResponse(
                json.dumps({'message': success_message}),
                content_type="application/json",
            )
        else:
            messages.success(request, success_message)
            return HttpResponseRedirect(success_url)


class VmList(LoginRequiredMixin, ListView):
    template_name = "dashboard/vm-list.html"

    def get(self, *args, **kwargs):
        if self.request.is_ajax():
            favs = Instance.objects.filter(
                favourite__user=self.request.user).values_list('pk', flat=True)
            instances = Instance.get_objects_with_level(
                'user', self.request.user).filter(
                destroyed_at=None).all()
            instances = [{
                'pk': i.pk,
                'name': i.name,
                'icon': i.get_status_icon(),
                'host': "" if not i.primary_host else i.primary_host.hostname,
                'status': i.get_status_display(),
                'fav': i.pk in favs} for i in instances]
            return HttpResponse(
                json.dumps(list(instances)),  # instances is ValuesQuerySet
                content_type="application/json",
            )
        else:
            return super(VmList, self).get(*args, **kwargs)

    def get_queryset(self):
        logger.debug('VmList.get_queryset() called. User: %s',
                     unicode(self.request.user))
        queryset = Instance.get_objects_with_level(
            'user', self.request.user).filter(destroyed_at=None)
        s = self.request.GET.get("s")
        if s:
            queryset = queryset.filter(name__icontains=s)

        sort = self.request.GET.get("sort")
        # remove "-" that means descending order
        # also check if the column name is valid
        if (sort and
            (sort[1:] if sort[0] == "-" else sort)
                in [i.name for i in Instance._meta.fields] + ["pk"]):
            queryset = queryset.order_by(sort)
        return queryset.select_related('owner', 'node')


class NodeList(LoginRequiredMixin, SuperuserRequiredMixin, SingleTableView):
    template_name = "dashboard/node-list.html"
    table_class = NodeListTable
    table_pagination = False

    def get(self, *args, **kwargs):
        if self.request.is_ajax():
            nodes = Node.objects.all()
            nodes = [{
                'name': i.name,
                'icon': i.get_status_icon(),
                'url': i.get_absolute_url(),
                'label': i.get_status_label(),
                'status': i.state.lower()} for i in nodes]

            return HttpResponse(
                json.dumps(list(nodes)),
                content_type="application/json",
            )
        else:
            return super(NodeList, self).get(*args, **kwargs)

    def get_queryset(self):
        return Node.objects.annotate(
            number_of_VMs=Count('instance_set')).select_related('host')


class GroupList(LoginRequiredMixin, SingleTableView):
    template_name = "dashboard/group-list.html"
    model = Group
    table_class = GroupListTable
    table_pagination = False

    def get(self, *args, **kwargs):
        if self.request.is_ajax():
            groups = [{
                'url': reverse("dashboard.views.group-detail",
                               kwargs={'pk': i.pk}),
                'name': i.name} for i in self.get_queryset()]
            return HttpResponse(
                json.dumps(list(groups)),
                content_type="application/json",
            )
        else:
            return super(GroupList, self).get(*args, **kwargs)

    def get_queryset(self):
        logger.debug('GroupList.get_queryset() called. User: %s',
                     unicode(self.request.user))
        profiles = GroupProfile.get_objects_with_level(
            'operator', self.request.user)
        groups = Group.objects.filter(groupprofile__in=profiles)
        s = self.request.GET.get("s")
        if s:
            groups = groups.filter(name__icontains=s)
        return groups


class GroupRemoveUserView(CheckedDetailView, DeleteView):
    model = Group
    slug_field = 'pk'
    slug_url_kwarg = 'group_pk'
    read_level = 'operator'

    def get_has_level(self):
        return self.object.profile.has_level

    def get_context_data(self, **kwargs):
        context = super(GroupRemoveUserView, self).get_context_data(**kwargs)
        try:
            context['member'] = User.objects.get(pk=self.member_pk)
        except User.DoesNotExist:
            raise Http404()
        return context

    def get_success_url(self):
        next = self.request.POST.get('next')
        if next:
            return next
        else:
            return reverse_lazy("dashboard.views.group-detail",
                                kwargs={'pk': self.get_object().pk})

    def get(self, request, member_pk, *args, **kwargs):
        self.member_pk = member_pk
        return super(GroupRemoveUserView, self).get(request, *args, **kwargs)

    def get_template_names(self):
        if self.request.is_ajax():
            return ['dashboard/confirm/ajax-remove.html']
        else:
            return ['dashboard/confirm/base-remove.html']

    def remove_member(self, pk):
        container = self.get_object()
        container.user_set.remove(User.objects.get(pk=pk))

    def get_success_message(self):
        return _("Member successfully removed from group.")

    def delete(self, request, *args, **kwargs):
        object = self.get_object()
        if not object.profile.has_level(request.user, 'operator'):
            raise PermissionDenied()
        self.remove_member(kwargs["member_pk"])
        success_url = self.get_success_url()
        success_message = self.get_success_message()
        if request.is_ajax():
            return HttpResponse(
                json.dumps({'message': success_message}),
                content_type="application/json",
            )
        else:
            messages.success(request, success_message)
            return HttpResponseRedirect(success_url)


class GroupRemoveAclUserView(GroupRemoveUserView):

    def remove_member(self, pk):
        container = self.get_object().profile
        container.set_level(User.objects.get(pk=pk), None)

    def get_success_message(self):
        return _("Acl user successfully removed from group.")


class GroupRemoveAclGroupView(GroupRemoveUserView):

    def get_context_data(self, **kwargs):
        context = super(GroupRemoveUserView, self).get_context_data(**kwargs)
        try:
            context['member'] = Group.objects.get(pk=self.member_pk)
        except User.DoesNotExist:
            raise Http404()
        return context

    def remove_member(self, pk):
        container = self.get_object().profile
        container.set_level(Group.objects.get(pk=pk), None)

    def get_success_message(self):
        return _("Acl group successfully removed from group.")


class GroupDelete(CheckedDetailView, DeleteView):

    """This stuff deletes the group.
    """
    model = Group
    template_name = "dashboard/confirm/base-delete.html"
    read_level = 'operator'

    def get_has_level(self):
        return self.object.profile.has_level

    def get_template_names(self):
        if self.request.is_ajax():
            return ['dashboard/confirm/ajax-delete.html']
        else:
            return ['dashboard/confirm/base-delete.html']

    # github.com/django/django/blob/master/django/views/generic/edit.py#L245
    def delete(self, request, *args, **kwargs):
        object = self.get_object()
        if not object.profile.has_level(request.user, 'owner'):
            raise PermissionDenied()
        object.delete()
        success_url = self.get_success_url()
        success_message = _("Group successfully deleted.")

        if request.is_ajax():
            if request.POST.get('redirect').lower() == "true":
                messages.success(request, success_message)
            return HttpResponse(
                json.dumps({'message': success_message}),
                content_type="application/json",
            )
        else:
            messages.success(request, success_message)
            return HttpResponseRedirect(success_url)

    def get_success_url(self):
        next = self.request.POST.get('next')
        if next:
            return next
        else:
            return reverse_lazy('dashboard.index')


class VmCreate(LoginRequiredMixin, TemplateView):

    form_class = VmCustomizeForm
    form = None

    def get_template_names(self):
        if self.request.is_ajax():
            return ['dashboard/modal-wrapper.html']
        else:
            return ['dashboard/nojs-wrapper.html']

    def get(self, request, form=None, *args, **kwargs):
        form_error = form is not None
        template = (form.template.pk if form_error
                    else request.GET.get("template"))
        templates = InstanceTemplate.get_objects_with_level('user',
                                                            request.user)
        if form is None and template:
            form = self.form_class(user=request.user,
                                   template=templates.get(pk=template))

        context = self.get_context_data(**kwargs)
        if template:
            context.update({
                'template': 'dashboard/_vm-create-2.html',
                'box_title': _('Customize VM'),
                'ajax_title': False,
                'vm_create_form': form,
                'template_o': templates.get(pk=template),
            })
        else:
            context.update({
                'template': 'dashboard/_vm-create-1.html',
                'box_title': _('Create a VM'),
                'ajax_title': False,
                'templates': templates.all(),
            })
        return self.render_to_response(context)

    def __create_normal(self, request, *args, **kwargs):
        user = request.user
        template = InstanceTemplate.objects.get(
            pk=request.POST.get("template"))

        # permission check
        if not template.has_level(request.user, 'user'):
            raise PermissionDenied()

        instances = [Instance.create_from_template(
            template=template, owner=user)]
        return self.__deploy(request, instances)

    def __create_customized(self, request, *args, **kwargs):
        user = request.user
        form = self.form_class(
            request.POST, user=request.user,
            template=InstanceTemplate.objects.get(
                pk=request.POST.get("template")
            )
        )
        if not form.is_valid():
            return self.get(request, form, *args, **kwargs)
        post = form.cleaned_data

        template = InstanceTemplate.objects.get(pk=post['template'])
        # permission check
        if not template.has_level(user, 'user'):
            raise PermissionDenied()

        if request.user.has_perm('vm.set_resources'):
            ikwargs = {
                'name': post['name'],
                'num_cores': post['cpu_count'],
                'ram_size': post['ram_size'],
                'priority': post['cpu_priority'],
            }
            networks = [InterfaceTemplate(vlan=l, managed=l.managed)
                        for l in post['networks']]
            disks = post['disks']

            ikwargs.update({
                'template': template,
                'owner': user,
                'networks': networks,
                'disks': disks,
            })

            amount = post['amount']
            instances = Instance.mass_create_from_template(amount=amount,
                                                           **ikwargs)
            return self.__deploy(request, instances)
        else:
            raise PermissionDenied()

    def __deploy(self, request, instances, *args, **kwargs):
        for i in instances:
            i.deploy.async(user=request.user)

        if len(instances) > 1:
            messages.success(request, __(
                "Successfully created %(count)d VM.",  # this should not happen
                "Successfully created %(count)d VMs.", len(instances)) % {
                'count': len(instances)})
            path = reverse("dashboard.index")
        else:
            messages.success(request, _("VM successfully created."))
            path = instances[0].get_absolute_url()

        if request.is_ajax():
            return HttpResponse(json.dumps({'redirect': path}),
                                content_type="application/json")
        else:
            return redirect("%s#activity" % path)

    def post(self, request, *args, **kwargs):
        user = request.user

        # limit chekcs
        try:
            limit = user.profile.instance_limit
        except Exception as e:
            logger.debug('No profile or instance limit: %s', e)
        else:
            current = Instance.active.filter(owner=user).count()
            logger.debug('current use: %d, limit: %d', current, limit)
            if limit < current:
                messages.error(request,
                               _('Instance limit (%d) exceeded.') % limit)
                if request.is_ajax():
                    return HttpResponse(json.dumps({'redirect': '/'}),
                                        content_type="application/json")
                else:
                    return redirect('/')

        create_func = (self.__create_normal if
                       request.POST.get("customized") is None else
                       self.__create_customized)

        return create_func(request, *args, **kwargs)


class NodeCreate(LoginRequiredMixin, SuperuserRequiredMixin, TemplateView):

    form_class = HostForm
    hostform = None

    formset_class = inlineformset_factory(Host, Node, form=NodeForm, extra=1)
    formset = None

    def get_template_names(self):
        if self.request.is_ajax():
            return ['dashboard/modal-wrapper.html']
        else:
            return ['dashboard/nojs-wrapper.html']

    def get(self, request, hostform=None, formset=None, *args, **kwargs):
        if hostform is None:
            hostform = self.form_class()
        if formset is None:
            formset = self.formset_class(instance=Host())
        context = self.get_context_data(**kwargs)
        context.update({
            'template': 'dashboard/node-create.html',
            'box_title': 'Create a Node',
            'hostform': hostform,
            'formset': formset,

        })
        return self.render_to_response(context)

    def get_context_data(self, **kwargs):
        context = super(NodeCreate, self).get_context_data(**kwargs)
        # TODO acl
        context.update({
        })

        return context

    # TODO handle not ajax posts
    def post(self, request, *args, **kwargs):
        if not self.request.user.is_authenticated():
            raise PermissionDenied()

        hostform = self.form_class(request.POST)
        formset = self.formset_class(request.POST, Host())
        if not hostform.is_valid():
            return self.get(request, hostform, formset, *args, **kwargs)
        hostform.setowner(request.user)
        savedform = hostform.save(commit=False)
        formset = self.formset_class(request.POST, instance=savedform)
        if not formset.is_valid():
            return self.get(request, hostform, formset, *args, **kwargs)

        savedform.save()
        nodemodel = formset.save()
        messages.success(request, _('Node successfully created.'))
        path = nodemodel[0].get_absolute_url()
        if request.is_ajax():
            return HttpResponse(json.dumps({'redirect': path}),
                                content_type="application/json")
        else:
            return redirect(path)


class GroupCreate(LoginRequiredMixin, TemplateView):

    form_class = GroupCreateForm
    form = None

    def get_template_names(self):
        if self.request.is_ajax():
            return ['dashboard/modal-wrapper.html']
        else:
            return ['dashboard/nojs-wrapper.html']

    def get(self, request, form=None, *args, **kwargs):
        if not request.user.has_module_perms('auth'):
            raise PermissionDenied()
        if form is None:
            form = self.form_class()
        context = self.get_context_data(**kwargs)
        context.update({
            'template': 'dashboard/group-create.html',
            'box_title': 'Create a Group',
            'form': form,

        })
        return self.render_to_response(context)

    def post(self, request, *args, **kwargs):
        if not request.user.has_module_perms('auth'):
            raise PermissionDenied()
        form = self.form_class(request.POST)
        if not form.is_valid():
            return self.get(request, form, *args, **kwargs)
        form.cleaned_data
        savedform = form.save()
        savedform.profile.set_level(request.user, 'owner')
        messages.success(request, _('Group successfully created.'))
        if request.is_ajax():
            return HttpResponse(json.dumps({'redirect':
                                savedform.profile.get_absolute_url()}),
                                content_type="application/json")
        else:
            return redirect(savedform.profile.get_absolute_url())


class VmDelete(LoginRequiredMixin, DeleteView):
    model = Instance
    template_name = "dashboard/confirm/base-delete.html"

    def get_template_names(self):
        if self.request.is_ajax():
            return ['dashboard/confirm/ajax-delete.html']
        else:
            return ['dashboard/confirm/base-delete.html']

    def get_success_url(self):
        next = self.request.POST.get('next')
        if next:
            return next
        else:
            return reverse_lazy('dashboard.index')

    def get_context_data(self, **kwargs):
        object = self.get_object()
        if not object.has_level(self.request.user, 'owner'):
            raise PermissionDenied()
        # this is redundant now, but if we wanna add more to print
        # we'll need this
        context = super(VmDelete, self).get_context_data(**kwargs)
        return context

    # github.com/django/django/blob/master/django/views/generic/edit.py#L245
    def delete(self, request, *args, **kwargs):
        object = self.get_object()
        if not object.has_level(request.user, 'owner'):
            raise PermissionDenied()

        object.destroy.async(user=request.user)
        success_url = self.get_success_url()
        success_message = _("VM successfully deleted.")

        if request.is_ajax():
            if request.POST.get('redirect').lower() == "true":
                messages.success(request, success_message)
            return HttpResponse(
                json.dumps({'message': success_message}),
                content_type="application/json",
            )
        else:
            messages.success(request, success_message)
            return HttpResponseRedirect(success_url)


class NodeDelete(LoginRequiredMixin, SuperuserRequiredMixin, DeleteView):

    """This stuff deletes the node.
    """
    model = Node
    template_name = "dashboard/confirm/base-delete.html"

    def get_template_names(self):
        if self.request.is_ajax():
            return ['dashboard/confirm/ajax-delete.html']
        else:
            return ['dashboard/confirm/base-delete.html']

    def get_context_data(self, **kwargs):
        # this is redundant now, but if we wanna add more to print
        # we'll need this
        context = super(NodeDelete, self).get_context_data(**kwargs)
        return context

    # github.com/django/django/blob/master/django/views/generic/edit.py#L245
    def delete(self, request, *args, **kwargs):
        object = self.get_object()

        object.delete()
        success_url = self.get_success_url()
        success_message = _("Node successfully deleted.")

        if request.is_ajax():
            if request.POST.get('redirect').lower() == "true":
                messages.success(request, success_message)
            return HttpResponse(
                json.dumps({'message': success_message}),
                content_type="application/json",
            )
        else:
            messages.success(request, success_message)
            return HttpResponseRedirect(success_url)

    def get_success_url(self):
        next = self.request.POST.get('next')
        if next:
            return next
        else:
            return reverse_lazy('dashboard.index')


class NodeAddTraitView(SuperuserRequiredMixin, DetailView):
    model = Node
    template_name = "dashboard/node-add-trait.html"

    def get_success_url(self):
        next = self.request.GET.get('next')
        if next:
            return next
        else:
            return self.object.get_absolute_url()

    def get_context_data(self, **kwargs):
        self.object = self.get_object()
        context = super(NodeAddTraitView, self).get_context_data(**kwargs)
        context['form'] = (TraitForm(self.request.POST) if self.request.POST
                           else TraitForm())
        return context

    def post(self, request, pk, *args, **kwargs):
        context = self.get_context_data(**kwargs)
        form = context['form']
        if form.is_valid():
            node = self.object
            n = form.cleaned_data['name']
            trait, created = Trait.objects.get_or_create(name=n)
            node.traits.add(trait)
            success_message = _("Trait successfully added to node.")
            messages.success(request, success_message)
            return redirect(self.get_success_url())
        else:
            return self.get(self, request, pk, *args, **kwargs)


class NodeStatus(LoginRequiredMixin, SuperuserRequiredMixin, DetailView):
    template_name = "dashboard/confirm/node-status.html"
    model = Node

    def get_template_names(self):
        if self.request.is_ajax():
            return ['dashboard/confirm/ajax-node-status.html']
        else:
            return ['dashboard/confirm/node-status.html']

    def get_success_url(self):
        next = self.request.GET.get('next')
        if next:
            return next
        else:
            return reverse_lazy("dashboard.views.node-detail",
                                kwargs={'pk': self.object.pk})

    def get_context_data(self, **kwargs):
        context = super(NodeStatus, self).get_context_data(**kwargs)
        if self.object.enabled:
            context['status'] = "disable"
        else:
            context['status'] = "enable"
        return context

    def post(self, request, *args, **kwargs):
        if request.POST.get('change_status') is not None:
            return self.__set_status(request)
        return redirect(reverse_lazy("dashboard.views.node-detail",
                                     kwargs={'pk': self.get_object().pk}))

    def __set_status(self, request):
        self.object = self.get_object()
        if not self.object.enabled:
            self.object.enable(user=request.user)
        else:
            self.object.disable(user=request.user)
        success_message = _("Node successfully changed status.")

        if request.is_ajax():
            response = {
                'message': success_message,
                'node_pk': self.object.pk
            }
            return HttpResponse(
                json.dumps(response),
                content_type="application/json"
            )
        else:
            messages.success(request, success_message)
            return redirect(self.get_success_url())


class NodeFlushView(LoginRequiredMixin, SuperuserRequiredMixin, DetailView):
    template_name = "dashboard/confirm/node-flush.html"
    model = Node

    def get_template_names(self):
        if self.request.is_ajax():
            return ['dashboard/confirm/ajax-node-flush.html']
        else:
            return ['dashboard/confirm/node-flush.html']

    def get_success_url(self):
        next = self.request.GET.get('next')
        if next:
            return next
        else:
            return reverse_lazy("dashboard.views.node-detail",
                                kwargs={'pk': self.object.pk})

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

    def post(self, request, *args, **kwargs):
        if request.POST.get('flush') is not None:
            return self.__flush(request)
        return redirect(reverse_lazy("dashboard.views.node-detail",
                                     kwargs={'pk': self.get_object().pk}))

    def __flush(self, request):
        self.object = self.get_object()
        self.object.flush.async(user=request.user)
        success_message = _("Node successfully flushed.")
        messages.success(request, success_message)
        return redirect(self.get_success_url())


class PortDelete(LoginRequiredMixin, DeleteView):
    model = Rule
    pk_url_kwarg = 'rule'

    def get_template_names(self):
        if self.request.is_ajax():
            return ['dashboard/confirm/ajax-delete.html']
        else:
            return ['dashboard/confirm/base-delete.html']

    def get_context_data(self, **kwargs):
        context = super(PortDelete, self).get_context_data(**kwargs)
        rule = kwargs.get('object')
        instance = rule.host.interface_set.get().instance
        context['title'] = _("Port delete confirmation")
        context['text'] = _("Are you sure you want to close %(port)d/"
                            "%(proto)s on %(vm)s?" % {'port': rule.dport,
                                                      'proto': rule.proto,
                                                      'vm': instance})
        return context

    def delete(self, request, *args, **kwargs):
        rule = Rule.objects.get(pk=kwargs.get("rule"))
        instance = rule.host.interface_set.get().instance
        if not instance.has_level(request.user, 'owner'):
            raise PermissionDenied()

        super(PortDelete, self).delete(request, *args, **kwargs)

        success_url = self.get_success_url()
        success_message = _("Port successfully removed.")

        if request.is_ajax():
            return HttpResponse(
                json.dumps({'message': success_message}),
                content_type="application/json",
            )
        else:
            messages.success(request, success_message)
            return HttpResponseRedirect("%s#network" % success_url)

    def get_success_url(self):
        return reverse_lazy('dashboard.views.detail',
                            kwargs={'pk': self.kwargs.get("pk")})


class VmMassDelete(LoginRequiredMixin, View):
    def get(self, request, *args, **kwargs):
        vms = request.GET.getlist('v[]')
        objects = Instance.objects.filter(pk__in=vms)
        return render(request, "dashboard/confirm/mass-delete.html",
                      {'objects': objects})

    def post(self, request, *args, **kwargs):
        vms = request.POST.getlist('vms')
        names = []
        if vms is not None:
            for i in Instance.objects.filter(pk__in=vms):
                if not i.has_level(request.user, 'owner'):
                    logger.info('Tried to delete instance #%d without owner '
                                'permission by %s.', i.pk,
                                unicode(request.user))
                    raise PermissionDenied()  # no need for rollback or proper
                                            # error message, this can't
                                            # normally happen.
                try:
                    i.destroy.async(user=request.user)
                    names.append(i.name)
                except Exception as e:
                    logger.error(e)

        success_message = __(
            "Mass delete complete, the following VM was deleted: %s.",
            "Mass delete complete, the following VMs were deleted: %s.",
            len(names)) % u', '.join(names)

        # we can get this only via AJAX ...
        if request.is_ajax():
            return HttpResponse(
                json.dumps({'message': success_message}),
                content_type="application/json"
            )
        else:
            messages.success(request, success_message)
            next = request.GET.get('next')
            return redirect(next if next else reverse_lazy('dashboard.index'))


class LeaseCreate(LoginRequiredMixin, SuperuserRequiredMixin,
                  SuccessMessageMixin, CreateView):
    model = Lease
    form_class = LeaseForm
    template_name = "dashboard/lease-create.html"
    success_message = _("Successfully created a new lease.")

    def get_success_url(self):
        return reverse_lazy("dashboard.views.template-list")


class LeaseDetail(LoginRequiredMixin, SuperuserRequiredMixin,
                  SuccessMessageMixin, UpdateView):
    model = Lease
    form_class = LeaseForm
    template_name = "dashboard/lease-edit.html"
    success_message = _("Successfully modified lease.")

    def get_success_url(self):
        return reverse_lazy("dashboard.views.lease-detail", kwargs=self.kwargs)


class LeaseDelete(LoginRequiredMixin, SuperuserRequiredMixin, DeleteView):
    model = Lease

    def get_success_url(self):
        return reverse("dashboard.views.template-list")

    def get_template_names(self):
        if self.request.is_ajax():
            return ['dashboard/confirm/ajax-delete.html']
        else:
            return ['dashboard/confirm/base-delete.html']

    def get_context_data(self, *args, **kwargs):
        c = super(LeaseDelete, self).get_context_data(*args, **kwargs)
        lease = self.get_object()
        templates = lease.instancetemplate_set
        if templates.count() > 0:
            text = _("You can't delete this lease because some templates "
                     "are still using it, modify these to proceed: ")

            c['text'] = text + ", ".join("<strong>%s (#%d)</strong>"
                                         "" % (o.name, o.pk)
                                         for o in templates.all())
            c['disable_submit'] = True
        return c

    def delete(self, request, *args, **kwargs):
        object = self.get_object()

        if (object.instancetemplate_set.count() > 0):
            raise SuspiciousOperation()

        object.delete()
        success_url = self.get_success_url()
        success_message = _("Lease successfully deleted.")

        if request.is_ajax():
            return HttpResponse(
                json.dumps({'message': success_message}),
                content_type="application/json",
            )
        else:
            messages.success(request, success_message)
            return HttpResponseRedirect(success_url)


@require_GET
def vm_activity(request, pk):
    instance = Instance.objects.get(pk=pk)
    if not instance.has_level(request.user, 'owner'):
        raise PermissionDenied()

    response = {}
    only_status = request.GET.get("only_status", "false")

    response['human_readable_status'] = instance.get_status_display()
    response['status'] = instance.status
    response['icon'] = instance.get_status_icon()
    if only_status == "false":  # instance activity
        context = {
            'instance': instance,
            'activities': instance.get_activities(request.user),
            'ops': get_operations(instance, request.user),
        }

        response['activities'] = render_to_string(
            "dashboard/vm-detail/_activity-timeline.html",
            RequestContext(request, context),
        )
        response['ops'] = render_to_string(
            "dashboard/vm-detail/_operations.html",
            RequestContext(request, context),
        )

    return HttpResponse(
        json.dumps(response),
        content_type="application/json"
    )


class FavouriteView(TemplateView):

    def post(self, *args, **kwargs):
        user = self.request.user
        vm = Instance.objects.get(pk=self.request.POST.get("vm"))
        try:
            Favourite.objects.get(instance=vm, user=user).delete()
            return HttpResponse("Deleted.")
        except Favourite.DoesNotExist:
            Favourite(instance=vm, user=user).save()
            return HttpResponse("Added.")


class TransferOwnershipView(LoginRequiredMixin, DetailView):
    model = Instance
    template_name = 'dashboard/vm-detail/tx-owner.html'

    def post(self, request, *args, **kwargs):
        try:
            new_owner = search_user(request.POST['name'])
        except User.DoesNotExist:
            messages.error(request, _('Can not find specified user.'))
            return self.get(request, *args, **kwargs)
        except KeyError:
            raise SuspiciousOperation()

        obj = self.get_object()
        if not (obj.owner == request.user or
                request.user.is_superuser):
            raise PermissionDenied()

        token = signing.dumps((obj.pk, new_owner.pk),
                              salt=TransferOwnershipConfirmView.get_salt())
        token_path = reverse(
            'dashboard.views.vm-transfer-ownership-confirm', args=[token])
        try:
            new_owner.profile.notify(
                _('Ownership offer'),
                'dashboard/notifications/ownership-offer.html',
                {'instance': obj, 'token': token_path})
        except Profile.DoesNotExist:
            messages.error(request, _('Can not notify selected user.'))
        else:
            messages.success(request,
                             _('User %s is notified about the offer.') % (
                                 unicode(new_owner), ))

        return redirect(reverse_lazy("dashboard.views.detail",
                                     kwargs={'pk': obj.pk}))


class AbstractVmFunctionView(AccessMixin, View):
    """Abstract instance-action view.

    User can do the action with a valid token or if has at least required_level
    ACL level for the instance.

    Children should at least implement/add template_name, success_message,
    url_name, and do_action().
    """
    token_max_age = 3 * 24 * 3600
    required_level = 'owner'
    success_message = _("Failed to perform requested action.")

    @classmethod
    def check_acl(cls, instance, user):
        if not instance.has_level(user, cls.required_level):
            raise PermissionDenied()

    @classmethod
    def get_salt(cls):
        return unicode(cls)

    @classmethod
    def get_token(cls, instance, user, *args):
        t = tuple([getattr(i, 'pk', i) for i in [instance, user] + list(args)])
        return signing.dumps(t, salt=cls.get_salt())

    @classmethod
    def get_token_url(cls, instance, user, *args):
        key = cls.get_token(instance, user, *args)
        args = (instance.pk, key) + args
        return reverse(cls.url_name, args=args)
        # this wont work, CBVs suck: reverse(cls.as_view(), args=args)

    def get_template_names(self):
        return [self.template_name]

    def get(self, request, pk, key=None, *args, **kwargs):
        class LoginNeeded(Exception):
            pass
        pk = int(pk)
        instance = get_object_or_404(Instance, pk=pk)
        try:
            if key:
                logger.debug('Confirm dialog for token %s.', key)
                try:
                    self.validate_key(pk, key)
                except signing.SignatureExpired:
                    messages.error(request, _(
                        'The token has expired, please log in.'))
                    raise LoginNeeded()
                self.key = key
            else:
                if not request.user.is_authenticated():
                    raise LoginNeeded()
                self.check_acl(instance, request.user)
        except LoginNeeded:
            return redirect_to_login(request.get_full_path(),
                                     self.get_login_url(),
                                     self.get_redirect_field_name())
        except SuspiciousOperation as e:
            messages.error(request, _('This token is invalid.'))
            logger.warning('This token %s is invalid. %s', key, unicode(e))
            raise PermissionDenied()
        return render(request, self.get_template_names(),
                      self.get_context(instance))

    def post(self, request, pk, key=None, *args, **kwargs):
        class LoginNeeded(Exception):
            pass
        pk = int(pk)
        instance = get_object_or_404(Instance, pk=pk)

        try:
            if not request.user.is_authenticated() and key:
                try:
                    user = self.validate_key(pk, key)
                except signing.SignatureExpired:
                    messages.error(request, _(
                        'The token has expired, please log in.'))
                    raise LoginNeeded()
                self.key = key
            else:
                user = request.user
                self.check_acl(instance, request.user)
        except LoginNeeded:
            return redirect_to_login(request.get_full_path(),
                                     self.get_login_url(),
                                     self.get_redirect_field_name())
        except SuspiciousOperation as e:
            messages.error(request, _('This token is invalid.'))
            logger.warning('This token %s is invalid. %s', key, unicode(e))
            raise PermissionDenied()

        if self.do_action(instance, user):
            messages.success(request, self.success_message)
        else:
            messages.error(request, self.fail_message)
        return HttpResponseRedirect(instance.get_absolute_url())

    def validate_key(self, pk, key):
        """Get object based on signed token.
        """
        try:
            data = signing.loads(key, salt=self.get_salt())
            logger.debug('Token data: %s', unicode(data))
            instance, user = data
            logger.debug('Extracted token data: instance: %s, user: %s',
                         unicode(instance), unicode(user))
        except (signing.BadSignature, ValueError, TypeError) as e:
            logger.warning('Tried invalid token. Token: %s, user: %s. %s',
                           key, unicode(self.request.user), unicode(e))
            raise SuspiciousOperation()

        try:
            instance, user = signing.loads(key, max_age=self.token_max_age,
                                           salt=self.get_salt())
            logger.debug('Extracted non-expired token data: %s, %s',
                         unicode(instance), unicode(user))
        except signing.BadSignature as e:
            raise signing.SignatureExpired()

        if pk != instance:
            logger.debug('pk (%d) != instance (%d)', pk, instance)
            raise SuspiciousOperation()
        user = User.objects.get(pk=user)
        return user

    def do_action(self, instance, user):  # noqa
        raise NotImplementedError('Please override do_action(instance, user)')

    def get_context(self, instance):
        context = {'instance': instance}
        if getattr(self, 'key', None) is not None:
            context['key'] = self.key
        return context


class VmRenewView(AbstractVmFunctionView):
    """User can renew an instance."""
    template_name = 'dashboard/confirm/base-renew.html'
    success_message = _("Virtual machine is successfully renewed.")
    url_name = 'dashboard.views.vm-renew'

    def get_context(self, instance):
        context = super(VmRenewView, self).get_context(instance)
        (context['time_of_suspend'],
         context['time_of_delete']) = instance.get_renew_times()
        return context

    def do_action(self, instance, user):
        instance.renew(user=user)
        logger.info('Instance %s renewed by %s.', unicode(instance),
                    unicode(user))
        return True


class TransferOwnershipConfirmView(LoginRequiredMixin, View):
    """User can accept an ownership offer."""

    max_age = 3 * 24 * 3600
    success_message = _("Ownership successfully transferred to you.")

    @classmethod
    def get_salt(cls):
        return unicode(cls)

    def get(self, request, key, *args, **kwargs):
        """Confirm ownership transfer based on token.
        """
        logger.debug('Confirm dialog for token %s.', key)
        try:
            instance, new_owner = self.get_instance(key, request.user)
        except PermissionDenied:
            messages.error(request, _('This token is for an other user.'))
            raise
        except SuspiciousOperation:
            messages.error(request, _('This token is invalid or has expired.'))
            raise PermissionDenied()
        return render(request,
                      "dashboard/confirm/base-transfer-ownership.html",
                      dictionary={'instance': instance, 'key': key})

    def post(self, request, key, *args, **kwargs):
        """Really transfer ownership based on token.
        """
        instance, owner = self.get_instance(key, request.user)

        old = instance.owner
        with instance_activity(code_suffix='ownership-transferred',
                               instance=instance, user=request.user):
            instance.owner = request.user
            instance.clean()
            instance.save()
        messages.success(request, self.success_message)
        logger.info('Ownership of %s transferred from %s to %s.',
                    unicode(instance), unicode(old), unicode(request.user))
        if old.profile:
            old.profile.notify(
                _('Ownership accepted'),
                'dashboard/notifications/ownership-accepted.html',
                {'instance': instance})
        return HttpResponseRedirect(instance.get_absolute_url())

    def get_instance(self, key, user):
        """Get object based on signed token.
        """
        try:
            instance, new_owner = (
                signing.loads(key, max_age=self.max_age,
                              salt=self.get_salt()))
        except (signing.BadSignature, ValueError, TypeError) as e:
            logger.error('Tried invalid token. Token: %s, user: %s. %s',
                         key, unicode(user), unicode(e))
            raise SuspiciousOperation()

        try:
            instance = Instance.objects.get(id=instance)
        except Instance.DoesNotExist as e:
            logger.error('Tried token to nonexistent instance %d. '
                         'Token: %s, user: %s. %s',
                         instance, key, unicode(user), unicode(e))
            raise Http404()

        if new_owner != user.pk:
            logger.error('%s (%d) tried the token for %s. Token: %s.',
                         unicode(user), user.pk, new_owner, key)
            raise PermissionDenied()
        return (instance, new_owner)


class GraphViewBase(LoginRequiredMixin, View):
    @staticmethod
    def get_graphite_url():
        graphite_host = getenv("GRAPHITE_HOST", None)
        graphite_port = getenv("GRAPHITE_PORT", None)

        if (graphite_host in ['', None] or graphite_port in ['', None]):
            logger.debug('GRAPHITE_HOST is empty.')
            return None

        return 'http://%s:%s' % (graphite_host, graphite_port)

    def get(self, request, pk, metric, time, *args, **kwargs):
        graphite_url = GraphViewBase.get_graphite_url()
        if graphite_url is None:
            raise Http404()

        if metric not in self.metrics.keys():
            raise SuspiciousOperation()

        try:
            instance = self.get_object(request, pk)
        except self.model.DoesNotExist:
            raise Http404()

        prefix = self.get_prefix(instance)
        target = self.metrics[metric] % {'prefix': prefix}
        title = self.get_title(instance, metric)
        params = {'target': target,
                  'from': '-%s' % time,
                  'title': title.encode('UTF-8'),
                  'width': '500',
                  'height': '200'}
        response = requests.post('%s/render/' % graphite_url, data=params)
        return HttpResponse(response.content, mimetype="image/png")

    def get_prefix(self, instance):
        raise NotImplementedError("Subclass must implement abstract method")

    def get_title(self, instance, metric):
        raise NotImplementedError("Subclass must implement abstract method")

    def get_object(self, request, pk):
        instance = self.model.objects.get(id=pk)
        if not instance.has_level(request.user, 'user'):
            raise PermissionDenied()
        return instance


class VmGraphView(GraphViewBase):
    metrics = {
        'cpu': ('cactiStyle(alias(nonNegativeDerivative(%(prefix)s.cpu.usage),'
                '"cpu usage (%%)"))'),
        'memory': ('cactiStyle(alias(%(prefix)s.memory.usage,'
                   '"memory usage (%%)"))'),
        'network': (
            'group('
            'aliasSub(nonNegativeDerivative(%(prefix)s.network.bytes_recv*),'
            ' ".*-(\d+)\\)", "out (vlan \\1)"),'
            'aliasSub(nonNegativeDerivative(%(prefix)s.network.bytes_sent*),'
            ' ".*-(\d+)\\)", "in (vlan \\1)"))'),
    }
    model = Instance

    def get_prefix(self, instance):
        return 'vm.%s' % instance.vm_name

    def get_title(self, instance, metric):
        return '%s (%s) - %s' % (instance.name, instance.vm_name, metric)


class NodeGraphView(SuperuserRequiredMixin, GraphViewBase):
    metrics = {
        'cpu': ('cactiStyle(alias(nonNegativeDerivative(%(prefix)s.cpu.times),'
                '"cpu usage (%%)"))'),
        'memory': ('cactiStyle(alias(%(prefix)s.memory.usage,'
                   '"memory usage (%%)"))'),
        'network': ('cactiStyle(aliasByMetric('
                    'nonNegativeDerivative(%(prefix)s.network.bytes_*)))'),
    }
    model = Node

    def get_prefix(self, instance):
        return 'circle.%s' % instance.name

    def get_title(self, instance, metric):
        return '%s - %s' % (instance.name, metric)

    def get_object(self, request, pk):
        return self.model.objects.get(id=pk)


class NotificationView(LoginRequiredMixin, TemplateView):

    def get_template_names(self):
        if self.request.is_ajax():
            return ['dashboard/_notifications-timeline.html']
        else:
            return ['dashboard/notifications.html']

    def get_context_data(self, *args, **kwargs):
        context = super(NotificationView, self).get_context_data(
            *args, **kwargs)
        # we need to convert it to list, otherwise it's gonna be
        # similar to a QuerySet and update everything to
        # read status after get
        n = 10 if self.request.is_ajax() else 1000
        context['notifications'] = list(
            self.request.user.notification_set.values()[:n])
        return context

    def get(self, *args, **kwargs):
        response = super(NotificationView, self).get(*args, **kwargs)
        un = self.request.user.notification_set.filter(status="new")
        for u in un:
            u.status = "read"
            u.save()
        return response


def circle_login(request):
    authentication_form = CircleAuthenticationForm
    extra_context = {
        'saml2': hasattr(settings, "SAML_CONFIG")
    }
    response = login(request, authentication_form=authentication_form,
                     extra_context=extra_context)
    set_language_cookie(request, response)
    return response


class DiskAddView(TemplateView):

    def post(self, *args, **kwargs):
        is_template = self.request.POST.get("disk-is_template")
        object_pk = self.request.POST.get("disk-object_pk")
        is_template = int(is_template) == 1
        if is_template:
            obj = InstanceTemplate.objects.get(pk=object_pk)
        else:
            obj = Instance.objects.get(pk=object_pk)

        if not obj.has_level(self.request.user, 'owner'):
            raise PermissionDenied()

        form = DiskAddForm(
            self.request.POST,
            user=self.request.user,
            is_template=is_template, object_pk=object_pk,
            prefix="disk"
        )

        if form.is_valid():
            if form.cleaned_data.get("size"):
                messages.success(self.request, _("Disk successfully added."))
            else:
                messages.success(self.request, _("Disk download started."))
            form.save()
        else:
            error = "<br /> ".join(["<strong>%s</strong>: %s" %
                                    (title_filter(i[0]), i[1][0])
                                    for i in form.errors.items()])
            messages.error(self.request, error)

        if is_template:
            r = obj.get_absolute_url()
        else:
            r = obj.get_absolute_url()
            r = "%s#resources" % r
        return redirect(r)


class MyPreferencesView(UpdateView):
    model = Profile

    def get_context_data(self, *args, **kwargs):
        context = super(MyPreferencesView, self).get_context_data(*args,
                                                                  **kwargs)
        context['forms'] = {
            'change_password': CirclePasswordChangeForm(
                user=self.request.user),
            'change_language': MyProfileForm(instance=self.get_object()),
        }
        return context

    def get_object(self, queryset=None):
        if self.request.user.is_anonymous():
            raise PermissionDenied()
        try:
            return self.request.user.profile
        except Profile.DoesNotExist:
            raise Http404(_("You don't have a profile."))

    def post(self, request, *args, **kwargs):
        self.ojbect = self.get_object()
        redirect_response = HttpResponseRedirect(
            reverse("dashboard.views.profile"))
        if "preferred_language" in request.POST:
            form = MyProfileForm(request.POST, instance=self.get_object())
            if form.is_valid():
                lang = form.cleaned_data.get("preferred_language")
                set_language_cookie(self.request, redirect_response, lang)
                form.save()
        else:
            form = CirclePasswordChangeForm(user=request.user,
                                            data=request.POST)
            if form.is_valid():
                form.save()

        if form.is_valid():
            return redirect_response
        else:
            return self.get(request, form=form, *args, **kwargs)

    def get(self, request, form=None, *args, **kwargs):
        # if this is not here, it won't work
        self.object = self.get_object()
        context = self.get_context_data(*args, **kwargs)
        if form is not None:
            # a little cheating, users can't post invalid
            # language selection forms (without modifying the HTML)
            context['forms']['change_password'] = form
        return self.render_to_response(context)


def set_language_cookie(request, response, lang=None):
    if lang is None:
        try:
            lang = request.user.profile.preferred_language
        except:
            return

    cname = getattr(settings, 'LANGUAGE_COOKIE_NAME', 'django_language')
    response.set_cookie(cname, lang, 365 * 86400)


class DiskRemoveView(DeleteView):
    model = Disk

    def get_template_names(self):
        if self.request.is_ajax():
            return ['dashboard/confirm/ajax-delete.html']
        else:
            return ['dashboard/confirm/base-delete.html']

    def get_context_data(self, **kwargs):
        context = super(DiskRemoveView, self).get_context_data(**kwargs)
        disk = self.get_object()
        app = disk.get_appliance()
        context['title'] = _("Disk remove confirmation")
        context['text'] = _("Are you sure you want to remove "
                            "<strong>%(disk)s</strong> from "
                            "<strong>%(app)s</strong>?" % {'disk': disk,
                                                           'app': app}
                            )
        return context

    def delete(self, request, *args, **kwargs):
        disk = self.get_object()
        if not disk.has_level(request.user, 'owner'):
            raise PermissionDenied()

        disk = self.get_object()
        app = disk.get_appliance()

        app.remove_disk(disk=disk, user=request.user)
        disk.destroy()

        next_url = request.POST.get("next")
        success_url = next_url if next_url else app.get_absolute_url()
        success_message = _("Disk successfully removed.")

        if request.is_ajax():
            return HttpResponse(
                json.dumps({'message': success_message}),
                content_type="application/json",
            )
        else:
            messages.success(request, success_message)
            return HttpResponseRedirect("%s#resources" % success_url)


@require_GET
def get_disk_download_status(request, pk):
    disk = Disk.objects.get(pk=pk)
    if not disk.has_level(request.user, 'owner'):
        raise PermissionDenied()

    return HttpResponse(
        json.dumps({
            'percentage': disk.get_download_percentage(),
            'failed': disk.failed
        }),
        content_type="application/json",
    )


class InstanceActivityDetail(SuperuserRequiredMixin, DetailView):
    model = InstanceActivity
    context_object_name = 'instanceactivity'  # much simpler to mock object
    template_name = 'dashboard/instanceactivity_detail.html'

    def get_context_data(self, **kwargs):
        ctx = super(InstanceActivityDetail, self).get_context_data(**kwargs)
        ctx['activities'] = self.object.instance.get_activities(
            self.request.user)
        return ctx


class InterfaceDeleteView(DeleteView):
    model = Interface

    def get_template_names(self):
        if self.request.is_ajax():
            return ['dashboard/confirm/ajax-delete.html']
        else:
            return ['dashboard/confirm/base-delete.html']

    def get_context_data(self, **kwargs):
        context = super(InterfaceDeleteView, self).get_context_data(**kwargs)
        interface = self.get_object()
        context['text'] = _("Are you sure you want to remove this interface "
                            "from <strong>%(vm)s</strong>?" %
                            {'vm': interface.instance.name})
        return context

    def delete(self, request, *args, **kwargs):
        self.object = self.get_object()
        instance = self.object.instance

        if not instance.has_level(request.user, "owner"):
            raise PermissionDenied()

        instance.remove_interface(interface=self.object, user=request.user)
        success_url = self.get_success_url()
        success_message = _("Interface successfully deleted.")

        if request.is_ajax():
            return HttpResponse(
                json.dumps(
                    {'message': success_message,
                     'removed_network': {
                         'vlan': self.object.vlan.name,
                         'vlan_pk': self.object.vlan.pk,
                         'managed': self.object.host is not None,
                     }}),
                content_type="application/json",
            )
        else:
            messages.success(request, success_message)
            return HttpResponseRedirect("%s#network" % success_url)

    def get_success_url(self):
        redirect = self.request.POST.get("next")
        if redirect:
            return redirect
        self.object.instance.get_absolute_url()