# 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

import json
import logging
from collections import OrderedDict

import openstack_api
from dashboard.models import Favourite
from django.conf import settings
from django.contrib import messages
from django.contrib.auth.mixins import LoginRequiredMixin
from django.core.exceptions import PermissionDenied
from django.core.urlresolvers import reverse_lazy, reverse
from django.http import (
    HttpResponse, Http404, HttpResponseRedirect, JsonResponse
)
from django.shortcuts import redirect, get_object_or_404
from django.template.loader import render_to_string
from django.utils.translation import (
    ugettext as _, ugettext_noop, ungettext_lazy,
)
from django.views.decorators.http import require_GET
from django.views.generic import (
    UpdateView, ListView, TemplateView,
    DetailView)

from braces.views import SuperuserRequiredMixin, LoginRequiredMixin

from common.models import (
    create_readable, HumanReadableException, fetch_human_exception,
    split_activity_code,
)
from firewall.models import Vlan, Host, Rule
# from manager.scheduler import SchedulerError
from network.models import DefaultPublicRouter, DefaultPublicRoutedNet
from openstack_api.nova import Server
from request.forms import TemplateRequestForm, LeaseRequestForm
from request.models import TemplateAccessType, LeaseType
from storage.models import Disk
from vm.models import (
    Instance, InstanceActivity, Interface,
    InstanceTemplate, Lease)
from vm.models.vm_lease import VmLease

from .util import (
    CheckedDetailView, AjaxOperationMixin, OperationView, AclUpdateView,
    FormOperationMixin, FilterMixin, GraphMixin
)
from ..forms import (
    AclUserOrGroupAddForm, VmResourcesForm, VmCustomizeForm, VmDeployForm, VmFromPlainImageForm, VmRemoveInterfaceForm,
    VmAddInterfaceForm, VmSaveForm, VmPortAddForm, VmPublicIpAddForm, VmPublicIpRemoveForm, VmRenewForm)

logger = logging.getLogger(__name__)


# 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 not request.user.has_perm('vm.access_console'):
#             raise PermissionDenied()
#         if self.object.node:
#             with self.object.activity(
#                     code_suffix='console-accessed', user=request.user,
#                     readable_name=ugettext_noop("console access"),
#                     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(LoginRequiredMixin, GraphMixin, DetailView):
    template_name = "dashboard/vm-detail.html"

    def get(self, *args, **kwargs):
        if self.request.is_ajax():
            return JsonResponse(self.get_json_data())
        else:
            return super(VmDetailView, self).get(*args, **kwargs)

    def get_json_data(self):
        instance = self.get_object()
        return {"status": instance.status,
                "host": instance.get_connect_host(),
                "port": instance.get_connect_port(),
                "password": instance.pw}

    def get_object(self, queryset=None):
        return openstack_api.nova.server_get(self.request, self.kwargs['pk'])

    def get_context_data(self, **kwargs):
        context = super(VmDetailView, self).get_context_data(**kwargs)
        instance = self.object
        user = self.request.user
        ops = get_operations(instance, user, self.request)
        hide_tutorial = self.request.COOKIES.get(
            "hide_tutorial_for_%s" % instance.id) == "True"
        vnc_console = None
        try:
            vnc_console = openstack_api.nova.server_vnc_console(self.request, instance.id)
        except:
            pass

        if vnc_console is None:
            try:
                vnc_console = openstack_api.nova.server_spice_console(self.request, instance.id)
            except:
                pass

        context.update({
            'graphite_enabled': settings.GRAPHITE_URL is not None,
            'vnc_url': vnc_console.url if vnc_console else None,
            'ops': ops,
            'op': {i.op: i for i in ops},
            # 'connect_commands': user.profile.get_connect_commands(instance),
            'hide_tutorial': hide_tutorial,
            'fav': Favourite.objects.filter(user=user.id, instance=instance.id).exists(),
            'instance': self.object
        })

        vm_lease = VmLease.get_or_create_lease(instance.id)

        context.update({
            'time_of_suspend': vm_lease.time_of_suspend,
            'time_of_delete': vm_lease.time_of_delete,
            'is_expiring': vm_lease.is_delete_expiring() or
                vm_lease.is_suspend_expiring() and instance.status is "ACTIVE",
        })

        # activity data
        # activities = instance.get_merged_activities(user)
        # show_show_all = len(activities) > 10
        # activities = activities[:10]
        # context['activities'] = _format_activities(activities)
        # context['show_show_all'] = show_show_all
        # latest = instance.get_latest_activity_in_progress()
        # context['is_new_state'] = (latest and
        #                            latest.resultant_state is not None and
        #                            instance.status != latest.resultant_state)

        activities = openstack_api.nova.instance_action_list(self.request, instance.id)

        ports = openstack_api.neutron.port_list(self.request)
        instance_ports = [p for p in ports if p.device_id == self.object.id]
        instance_ports_by_id = {p.id: p for p in ports if p.device_id == self.object.id}

        instance_net_ids = [p.network_id for p in instance_ports]
        all_networks = openstack_api.neutron.network_list(self.request)
        instance_networks = {n.id: n for n in all_networks if n.id in instance_net_ids and len(n.subnets) > 0}

        router_ports = [p for p in ports if p.device_owner == 'network:router_interface']
        routers = openstack_api.neutron.router_list(self.request)
        router_by_id = {r.id: r for r in routers}

        # mark networks with internet access
        for rtr_port in router_ports:
            if router_by_id[rtr_port.device_id].external_gateway_info is not None \
                and rtr_port.network_id in instance_networks.keys():
                instance_networks[rtr_port.network_id].internet_access = True

        for port in instance_ports:
            instance_networks[port.network_id].ipv4 = port.fixed_ips[0]['ip_address']
            instance_networks[port.network_id].port_id = port.id

        # set default subnets for networks
        for id in instance_networks:
            instance_networks[id].subnet = instance_networks[id].subnets[0]

        floating_ips = openstack_api.neutron.tenant_floating_ip_list(self.request)
        for floating_ip in floating_ips:
            if floating_ip.port_id in instance_ports_by_id.keys():
                port = instance_ports_by_id[floating_ip.port_id]
                instance_networks[port.network_id].public_ip = floating_ip.ip
                instance_networks[port.network_id].public_ip_id = floating_ip.id

        context['networks'] = instance_networks.values()

        # 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['os_type_icon'] = instance.os_type.replace("unknown",
        #                                                    "question")
        # ipv6 infos
        # context['ipv6_host'] = instance.get_connect_host(use_ipv6=True)
        # context['ipv6_port'] = instance.get_connect_port(use_ipv6=True)

        # resources forms
        can_edit = True
        # context['resources_form'] = VmResourcesForm(
        #     can_edit=can_edit, instance=instance)

        # if self.request.user.is_superuser:
        #     context['traits_form'] = TraitsForm(instance=instance)
        #     context['raw_data_form'] = RawDataForm(instance=instance)

        # resources change perm
        context['can_change_resources'] = self.request.user.has_perm(
            "vm.change_resources")

        # client info
        context['client_download'] = self.request.COOKIES.get(
            'downloaded_client')
        # can link template
        # context['can_link_template'] = instance.template

        # operation also allows RUNNING (if with_shutdown is present)
        context['save_resources_enabled'] = instance.status in (
            "STOPPED",
            "PENDING",
        )

        return context

    def post(self, request, *args, **kwargs):
        options = {
            'new_description': self.__set_description,
            'new_tag': self.__add_tag,
            'to_remove': self.__remove_tag,
            'abort_operation': self.__abort_operation,
        }
        for k, v in options.iteritems():
            if request.POST.get(k) is not None:
                return v(request)
        raise Http404()

    def __set_description(self, request):
        self.object = self.get_object()
        if not self.object.has_level(request.user, "operator"):
            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, "operator"):
            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, "operator"):
                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 JsonResponse({'message': message})
        else:
            return redirect(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 HttpResponseRedirect("%s#activity" %
                                    self.object.get_absolute_url())


# class VmTraitsUpdate(SuperuserRequiredMixin, UpdateView):
#     form_class = TraitsForm
#     model = Instance
#
#     def get_success_url(self):
#         return self.get_object().get_absolute_url() + "#resources"
#
#
# class VmRawDataUpdate(SuperuserRequiredMixin, UpdateView):
#     form_class = RawDataForm
#     model = Instance
#     template_name = 'dashboard/vm-detail/raw_data.html'
#
#     def get_success_url(self):
#         return self.get_object().get_absolute_url() + "#resources"
#
#
class VmOperationView(AjaxOperationMixin, OperationView):
    model = Server
    context_object_name = 'instance'  # much simpler to mock object

    def get_context_data(self, **kwargs):
        ctx = super(VmOperationView, self).get_context_data(**kwargs)
        return ctx

    def get_object(self):
        return openstack_api.nova.server_get(self.request, self.kwargs['pk'])

    def getModelUrl(self):
        return reverse('dashboard.views.detail', self.get_object().id)

def get_operations(instance, user, request):
    ops = []
    for k, v in vm_ops.iteritems():
        try:
            op = v.get_op_by_object(instance)
            op.check_auth(user, request)
            op.check_precond()
        except PermissionDenied as e:
            logger.debug('Not showing operation %s for %s: %s',
                         k, instance, unicode(e))
        except Exception as e:
            ops.append(v.bind_to_object(instance, disabled=True))
        else:
            ops.append(v.bind_to_object(instance))
    return ops

#
class VmRemoveInterfaceView(FormOperationMixin, VmOperationView):
    op = 'remove_interface'
    form_class = VmRemoveInterfaceForm
    show_in_toolbar = False
    icon = 'times'
    effect = "danger"

    def get_form_kwargs(self):
        port_id = self.request.GET.get('port_id')

        val = super(VmRemoveInterfaceView, self).get_form_kwargs()
        val.update({'port_id': port_id})
        return val


class VmAddInterfaceView(FormOperationMixin, VmOperationView):
    op = 'add_interface'
    form_class = VmAddInterfaceForm
    show_in_toolbar = False
    icon = 'globe'
    effect = 'success'
    with_reload = True

    def get_form_kwargs(self):
        context = super(VmAddInterfaceView, self).get_form_kwargs()
        networks = openstack_api.neutron.network_list_for_tenant(self.request, self.request.user.tenant_id)
        ports = openstack_api.neutron.port_list(self.request)
        instance_net_ids = [p.network_id for p in ports if p.device_id == self.object.id]
        choices = [(n.id, n.name) for n in networks if n.id not in instance_net_ids]
        context.update({
            'choices': choices
        })
        return context

#
# class VmDiskModifyView(FormOperationMixin, VmOperationView):
#     show_in_toolbar = False
#     with_reload = True
#     icon = 'arrows-alt'
#     effect = "success"
#
#     def get_form_kwargs(self):
#         choices = self.get_op().instance.disks
#         disk_pk = self.request.GET.get('disk')
#         if disk_pk:
#             try:
#                 default = choices.get(pk=disk_pk)
#             except (ValueError, Disk.DoesNotExist):
#                 raise Http404()
#         else:
#             default = None
#
#         val = super(VmDiskModifyView, self).get_form_kwargs()
#         val.update({'choices': choices, 'default': default})
#         return val
#
#
# class VmCreateDiskView(FormOperationMixin, VmOperationView):
#
#     op = 'create_disk'
#     form_class = VmCreateDiskForm
#     show_in_toolbar = False
#     icon = 'hdd-o'
#     effect = "success"
#     is_disk_operation = True
#     with_reload = True
#
#     def get_form_kwargs(self):
#         op = self.get_op()
#         val = super(VmCreateDiskView, self).get_form_kwargs()
#         num = op.instance.disks.count() + 1
#         val['default'] = "%s %d" % (op.instance.name, num)
#         return val
#
#
# class VmDownloadDiskView(FormOperationMixin, VmOperationView):
#
#     op = 'download_disk'
#     form_class = VmDownloadDiskForm
#     show_in_toolbar = False
#     icon = 'download'
#     effect = "success"
#     is_disk_operation = True
#     with_reload = True
#
#
# class VmMigrateView(FormOperationMixin, VmOperationView):
#
#     op = 'migrate'
#     icon = 'truck'
#     effect = 'info'
#     template_name = 'dashboard/_vm-migrate.html'
#     form_class = VmMigrateForm
#
#     def get_form_kwargs(self):
#         online = (n.pk for n in Node.objects.filter(enabled=True) if n.online)
#         choices = Node.objects.filter(pk__in=online)
#         default = None
#         inst = self.get_object()
#         try:
#             if isinstance(inst, Instance):
#                 default = inst.select_node()
#         except SchedulerError:
#             logger.exception("scheduler error:")
#
#         val = super(VmMigrateView, self).get_form_kwargs()
#         val.update({'choices': choices, 'default': default})
#         return val
#
#     def get_context_data(self, *args, **kwargs):
#         ctx = super(VmMigrateView, self).get_context_data(*args, **kwargs)
#
#         inst = self.get_object()
#         if isinstance(inst, Instance):
#             nodes_w_traits = [
#                 n.pk for n in Node.objects.filter(enabled=True)
#                 if n.online and
#                 has_traits(inst.req_traits.all(), n)
#             ]
#             ctx['nodes_w_traits'] = nodes_w_traits
#
#         return ctx
#
#
# class VmPortRemoveView(FormOperationMixin, VmOperationView):
#
#     template_name = 'dashboard/_vm-remove-port.html'
#     op = 'remove_port'
#     show_in_toolbar = False
#     with_reload = True
#     wait_for_result = 0.5
#     icon = 'times'
#     effect = "danger"
#     form_class = VmPortRemoveForm
#
#     def get_form_kwargs(self):
#         instance = self.get_op().instance
#         choices = Rule.portforwards().filter(
#             host__interface__instance=instance)
#         rule_pk = self.request.GET.get('rule')
#         if rule_pk:
#             try:
#                 default = choices.get(pk=rule_pk)
#             except (ValueError, Rule.DoesNotExist):
#                 raise Http404()
#         else:
#             default = None
#
#         val = super(VmPortRemoveView, self).get_form_kwargs()
#         val.update({'choices': choices, 'default': default})
#         return val
#
#
# class VmPortAddView(FormOperationMixin, VmOperationView):
#
#     op = 'add_port'
#     show_in_toolbar = False
#     with_reload = True
#     wait_for_result = 0.5
#     icon = 'plus'
#     effect = "success"
#     form_class = VmPortAddForm
#
#     def get_form_kwargs(self):
#         instance = self.get_op().instance
#         choices = Host.objects.filter(interface__instance=instance)
#         host_pk = self.request.GET.get('host')
#         if host_pk:
#             try:
#                 default = choices.get(pk=host_pk)
#             except (ValueError, Host.DoesNotExist):
#                 raise Http404()
#         else:
#             default = None
#
#         val = super(VmPortAddView, self).get_form_kwargs()
#         val.update({'choices': choices, 'default': default})
#         return val
#
#

class VmPublicIpAddView(FormOperationMixin, VmOperationView):

    op = 'add_public_ip'
    show_in_toolbar = False
    icon = 'plus'
    effect = "success"
    form_class = VmPublicIpAddForm

    def get_form_kwargs(self):
        ip_pools = openstack_api.neutron.floating_ip_pools_list(self.request)
        port_id = self.request.GET.get('port_id')

        val = super(VmPublicIpAddView, self).get_form_kwargs()
        val.update({'pools': ip_pools})
        val.update({'port_id': port_id})

        return val

class VmPublicIpRemoveView(FormOperationMixin, VmOperationView):

    op = 'remove_public_ip'
    show_in_toolbar = False
    icon = 'times'
    effect = "danger"
    form_class = VmPublicIpRemoveForm

    def get_form_kwargs(self):
        public_ip_id = self.request.GET.get('public_ip_id')

        val = super(VmPublicIpRemoveView, self).get_form_kwargs()
        val.update({'public_ip_id': public_ip_id})

        return val

class VmSaveView(FormOperationMixin, VmOperationView):

    op = 'save_as_template'
    icon = 'save'
    effect = 'info'
    form_class = VmSaveForm

    def get_form_kwargs(self):
        context = super(VmSaveView, self).get_form_kwargs()
        op = self.get_op()

        context['default'] = op._rename(op.instance.name)
        obj = self.get_object()

        #context['clone'] = True #TODO: if instance has a template already this option allows clone of permissions
        return context


# class VmResourcesChangeView(VmOperationView):
#     op = 'resources_change'
#     icon = "save"
#     show_in_toolbar = False
#     wait_for_result = 0.5
#
#     def post(self, request, extra=None, *args, **kwargs):
#         if extra is None:
#             extra = {}
#
#         instance = get_object_or_404(Instance, pk=kwargs['pk'])
#
#         form = VmResourcesForm(request.POST, instance=instance)
#         if not form.is_valid():
#             for f in form.errors:
#                 messages.error(request, "<strong>%s</strong>: %s" % (
#                     f, form.errors[f].as_text()
#                 ))
#             if request.is_ajax():  # this is not too nice
#                 store = messages.get_messages(request)
#                 store.used = True
#                 return JsonResponse({'success': False,
#                                      'messages': [unicode(m) for m in store]})
#             else:
#                 return HttpResponseRedirect(instance.get_absolute_url() +
#                                             "#resources")
#         else:
#             extra = form.cleaned_data
#             extra['max_ram_size'] = extra['ram_size']
#             return super(VmResourcesChangeView, self).post(request, extra,
#                                                            *args, **kwargs)
#
#
# class TokenOperationView(OperationView):
#     """Abstract operation view with token support.
#
#     User can do the action with a valid token instead of logging in.
#     """
#     token_max_age = 3 * 24 * 3600
#     redirect_exception_classes = (PermissionDenied, SuspiciousOperation, )
#
#     @classmethod
#     def get_salt(cls):
#         return unicode(cls)
#
#     @classmethod
#     def get_token(cls, instance, user):
#         t = tuple([getattr(i, 'pk', i) for i in [instance, user]])
#         return signing.dumps(t, salt=cls.get_salt(), compress=True)
#
#     @classmethod
#     def get_token_url(cls, instance, user):
#         key = cls.get_token(instance, user)
#         return cls.get_instance_url(instance.pk, key)
#
#     def check_auth(self):
#         if 'k' in self.request.GET:
#             try:  # check if token is needed at all
#                 return super(TokenOperationView, self).check_auth()
#             except Exception:
#                 op = self.get_op()
#                 pk = op.instance.pk
#                 key = self.request.GET.get('k')
#
#                 logger.debug("checking token supplied to %s",
#                              self.request.get_full_path())
#                 try:
#                     user = self.validate_key(pk, key)
#                 except signing.SignatureExpired:
#                     messages.error(self.request, _('The token has expired.'))
#                 else:
#                     logger.info("Request user changed to %s at %s",
#                                 user, self.request.get_full_path())
#                     self.request.user = user
#                     self.request.token_user = True
#         else:
#             logger.debug("no token supplied to %s",
#                          self.request.get_full_path())
#
#         return super(TokenOperationView, self).check_auth()
#
#     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
#
#
class VmRenewView(FormOperationMixin, VmOperationView):
    op = 'renew'
    icon = 'calendar'
    effect = 'success'
    show_in_toolbar = False
    form_class = VmRenewForm
    template_name = 'dashboard/_vm-renew.html'

    def get_form_kwargs(self):
        instance = self.get_op().instance
        user_role_names = [role["name"] for role in self.request.user.roles]

        leases_from_roles = Lease.objects.filter(roles_permitted__role_name__in=user_role_names)
        default_lease = Lease.objects.filter(name=settings.DEFAULT_LEASE_NAME)
        current_lease = Lease.objects.filter(vmlease__os_server_id=instance.id)

        choices = (leases_from_roles | default_lease | current_lease).distinct()

        default = VmLease.objects.get(os_server_id=instance.id).lease

        val = super(VmRenewView, self).get_form_kwargs()
        val.update({
            'choices': choices,
            'default': default,
        })
        return val

    def get_response_data(self, result, done, extra=None, **kwargs):
        extra = super(VmRenewView, self).get_response_data(result, done,
                                                           extra, **kwargs)
        instance = self.get_op().instance
        time_of_suspend = VmLease.objects.get(os_server_id=instance.id).time_of_suspend
        extra["new_suspend_time"] = unicode(time_of_suspend)
        return extra

    def get_context_data(self, **kwargs):
        context = super(VmRenewView, self).get_context_data(**kwargs)
        context['lease_request_form'] = LeaseRequestForm()
        context['lease_types'] = LeaseType.objects.exists()
        return context

#
#
# class VmStateChangeView(FormOperationMixin, VmOperationView):
#     op = 'emergency_change_state'
#     icon = 'legal'
#     effect = 'danger'
#     form_class = VmStateChangeForm
#     wait_for_result = 0.5
#
#     def get_form_kwargs(self):
#         inst = self.get_op().instance
#         active_activities = InstanceActivity.objects.filter(
#             finished__isnull=True, instance=inst)
#         show_interrupt = active_activities.exists()
#         val = super(VmStateChangeView, self).get_form_kwargs()
#         val.update({'show_interrupt': show_interrupt, 'status': inst.status})
#         return val
#
#
# class RedeployView(FormOperationMixin, VmOperationView):
#     op = 'redeploy'
#     icon = 'stethoscope'
#     effect = 'danger'
#     show_in_toolbar = True
#     form_class = RedeployForm
#     wait_for_result = 0.5
#
#
class VmDeployView(FormOperationMixin, VmOperationView):
    op = 'deploy'
    icon = 'play'
    effect = 'success'
    form_class = VmDeployForm

    def get_form_kwargs(self):
        kwargs = super(VmDeployView, self).get_form_kwargs()
        if self.request.user.is_superuser:
            online = (n.pk for n in
                      Node.objects.filter(enabled=True) if n.online)
            kwargs['choices'] = Node.objects.filter(pk__in=online)
            kwargs['instance'] = self.get_object()
        return kwargs
#
#
# class VmRenameView(FormOperationMixin, VmOperationView):
#     op = 'rename'
#     icon = 'pencil'
#     effect = 'success'
#     show_in_toolbar = False
#     form_class = VmRenameForm
#
#     def post(self, request, extra=None, *args, **kwargs):
#         if extra is None:
#             extra = {}
#         form = self.form_class(self.request.POST, **self.get_form_kwargs())
#         if form.is_valid():
#             extra.update(form.cleaned_data)
#             resp = super(FormOperationMixin, self).post(
#                 request, extra, *args, **kwargs)
#             success_message = _('VM successfully renamed.')
#             if request.is_ajax():
#                 return JsonResponse({'new_name': extra['new_name']})
#             else:
#                 messages.success(request, success_message)
#                 return resp
#         else:
#             return self.get(request)
#
#
vm_ops = OrderedDict([
    ('deploy', VmDeployView),
    ('wake_up', VmOperationView.factory(
        op='wake_up', icon='sun-o', effect='success')),
    ('sleep', VmOperationView.factory(
        op='sleep', icon='moon-o', effect='info')),
    # ('migrate', VmMigrateView),
    ('save_as_template', VmSaveView),
    ('reboot', VmOperationView.factory(
        op='reboot', icon='refresh', effect='warning')),
    # ('reset', VmOperationView.factory(
    #     op='reset', icon='bolt', effect='warning')),
    # ('shutdown', VmOperationView.factory(
    #     op='shutdown', icon='power-off', effect='warning')),
    ('shut_off', VmOperationView.factory(
        op='shut_off', icon='plug', effect='warning')),
    # ('recover', VmOperationView.factory(
    #     op='recover', icon='medkit', effect='warning')),
    # ('nostate', VmStateChangeView),
    # ('redeploy', RedeployView),
    ('destroy', VmOperationView.factory(
        op='destroy', icon='times', effect='danger')),
    # ('create_disk', VmCreateDiskView),
    # ('download_disk', VmDownloadDiskView),
    # ('resize_disk', VmDiskModifyView.factory(
    #     op='resize_disk', form_class=VmDiskResizeForm,
    #     icon='arrows-alt', effect="warning")),
    # ('remove_disk', VmDiskModifyView.factory(
    #     op='remove_disk', form_class=VmDiskRemoveForm,
    #     icon='times', effect="danger")),
    ('add_interface', VmAddInterfaceView),
    ('remove_interface', VmRemoveInterfaceView),
    # ('remove_port', VmPortRemoveView),
    # ('add_port', VmPortAddView),
    ('add_public_ip', VmPublicIpAddView),
    ('remove_public_ip', VmPublicIpRemoveView),
    ('renew', VmRenewView),
    # ('resources_change', VmResourcesChangeView),
    # ('password_reset', VmOperationView.factory(
    #     op='password_reset', icon='unlock', effect='warning',
    #     show_in_toolbar=False, wait_for_result=0.5, with_reload=True)),
    # ('mount_store', VmOperationView.factory(
    #     op='mount_store', icon='briefcase', effect='info',
    #     show_in_toolbar=False,
    # )),
    # ('install_keys', VmOperationView.factory(
    #     op='install_keys', icon='key', effect='info',
    #     show_in_toolbar=False,
    # )),
    # ('rename', VmRenameView),
])


def _get_activity_icon(act):
    op = act.get_operation()
    if op and op.id in vm_ops:
        return vm_ops[op.id].icon
    elif split_activity_code(act.activity_code)[-1] == u'console-accessed':
        return "terminal"
    else:
        return "cog"


def _format_activities(acts):
    for i in acts:
        i.icon = _get_activity_icon(i)
    return acts
#
#
# class MassOperationView(OperationView):
#     template_name = 'dashboard/mass-operate.html'
#
#     def check_auth(self):
#         self.get_op().check_perms(self.request.user)
#         for i in self.get_object():
#             if not i.has_level(self.request.user, "user"):
#                 raise PermissionDenied(
#                     "You have no user access to instance %d" % i.pk)
#
#     @classmethod
#     def get_urlname(cls):
#         return 'dashboard.vm.mass-op.%s' % cls.op
#
#     @classmethod
#     def get_url(cls):
#         return reverse("dashboard.vm.mass-op.%s" % cls.op)
#
#     def get_op(self, instance=None):
#         if instance:
#             return getattr(instance, self.op)
#         else:
#             return Instance._ops[self.op]
#
#     def get_context_data(self, **kwargs):
#         ctx = super(MassOperationView, self).get_context_data(**kwargs)
#         instances = self.get_object()
#         ctx['instances'] = self._get_operable_instances(
#             instances, self.request.user)
#         ctx['vm_count'] = sum(1 for i in ctx['instances'] if not i.disabled)
#         return ctx
#
#     def _call_operations(self, extra):
#         request = self.request
#         user = request.user
#         instances = self.get_object()
#         for i in instances:
#             try:
#                 self.get_op(i).async(user=user, **extra)
#             except HumanReadableException as e:
#                 e.send_message(request)
#             except Exception as e:
#                 # pre-existing errors should have been catched when the
#                 # confirmation dialog was constructed
#                 messages.error(request, _(
#                     "Failed to execute %(op)s operation on "
#                     "instance %(instance)s.") % {"op": self.name,
#                                                  "instance": i})
#
#     def get_object(self):
#         vms = getattr(self.request, self.request.method).getlist("vm")
#         return Instance.objects.filter(pk__in=vms)
#
#     def _get_operable_instances(self, instances, user):
#         for i in instances:
#             try:
#                 op = self.get_op(i)
#                 op.check_auth(user)
#                 op.check_precond()
#             except PermissionDenied as e:
#                 i.disabled = create_readable(
#                     _("You are not permitted to execute %(op)s on instance "
#                       "%(instance)s."), instance=i.pk, op=self.name)
#                 i.disabled_icon = "lock"
#             except Exception as e:
#                 i.disabled = fetch_human_exception(e)
#             else:
#                 i.disabled = None
#         return instances
#
#     def post(self, request, extra=None, *args, **kwargs):
#         self.check_auth()
#         if extra is None:
#             extra = {}
#
#         if hasattr(self, 'form_class'):
#             form = self.form_class(self.request.POST, **self.get_form_kwargs())
#             if form.is_valid():
#                 extra.update(form.cleaned_data)
#
#         self._call_operations(extra)
#         if request.is_ajax():
#             store = messages.get_messages(request)
#             store.used = True
#             return HttpResponse(
#                 json.dumps({'messages': [unicode(m) for m in store]}),
#                 content_type="application/json"
#             )
#         else:
#             return redirect(reverse("dashboard.views.vm-list"))
#
#     @classmethod
#     def factory(cls, vm_op, extra_bases=(), **kwargs):
#         return type(str(cls.__name__ + vm_op.op),
#                     tuple(list(extra_bases) + [cls, vm_op]), kwargs)
#
#
# class MassMigrationView(MassOperationView, VmMigrateView):
#     template_name = 'dashboard/_vm-mass-migrate.html'
#
#
# vm_mass_ops = OrderedDict([
#     ('deploy', MassOperationView.factory(vm_ops['deploy'])),
#     ('wake_up', MassOperationView.factory(vm_ops['wake_up'])),
#     ('sleep', MassOperationView.factory(vm_ops['sleep'])),
#     ('reboot', MassOperationView.factory(vm_ops['reboot'])),
#     ('reset', MassOperationView.factory(vm_ops['reset'])),
#     ('shut_off', MassOperationView.factory(vm_ops['shut_off'])),
#     ('migrate', MassMigrationView),
#     ('destroy', MassOperationView.factory(vm_ops['destroy'])),
# ])
#
#
class VmList(LoginRequiredMixin, FilterMixin, ListView):
    template_name = "dashboard/vm-list.html"
    allowed_filters = {
        'name': "name__icontains",
        'node': "node__name__icontains",
        'node_exact': "node__name",
        'status': "status__iexact",
        'tags[]': "tags__name__in",
        'tags': "tags__name__in",  # for search string
        'owner': "owner__username",
        'template': "template__pk",
    }

    def get_context_data(self, *args, **kwargs):
        context = super(VmList, self).get_context_data(*args, **kwargs)
        context['ops'] = []
        for k, v in vm_mass_ops.iteritems():
            try:
                v.check_perms(user=self.request.user)
            except PermissionDenied:
                pass
            else:
                context['ops'].append(v)
        context['search_form'] = self.search_form
        context['show_acts_in_progress'] = self.object_list.count() < 100
        return context

    def get(self, *args, **kwargs):
        if self.request.is_ajax():
            return self._create_ajax_request()
        else:
            self.search_form = VmListSearchForm(self.request.GET)
            self.search_form.full_clean()
            return super(VmList, self).get(*args, **kwargs)

    def _create_ajax_request(self):
        if self.request.GET.get("compact") is not None:
            instances = Instance.get_objects_with_level(
                "user", self.request.user).filter(destroyed_at=None)
            statuses = {}
            for i in instances:
                statuses[i.pk] = {
                    'status': i.get_status_display(),
                    'icon': i.get_status_icon(),
                    'in_status_change': i.is_in_status_change(),
                }
                if self.request.user.is_superuser:
                    statuses[i.pk]['node'] = i.node.name if i.node else "-"
            return HttpResponse(json.dumps(statuses),
                                content_type="application/json")
        else:
            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,
                'url': reverse('dashboard.views.detail', args=[i.pk]),
                'name': i.name,
                'icon': i.get_status_icon(),
                'host': i.short_hostname,
                'status': i.get_status_display(),
                'owner': (i.owner.profile.get_display_name()
                          if i.owner != self.request.user else None),
                'fav': i.pk in favs,
            } for i in instances]
            return HttpResponse(
                json.dumps(list(instances)),  # instances is ValuesQuerySet
                content_type="application/json",
            )

    def create_acl_queryset(self, model):
        queryset = super(VmList, self).create_acl_queryset(model)
        if not self.search_form.cleaned_data.get("include_deleted"):
            queryset = queryset.filter(destroyed_at=None)
        return queryset

    def get_queryset(self):
        logger.debug('VmList.get_queryset() called. User: %s',
                     unicode(self.request.user))
        queryset = self.create_acl_queryset(Instance)

        self.create_fake_get()
        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)

        filters, excludes = self.get_queryset_filters()
        return queryset.filter(**filters).exclude(**excludes).prefetch_related(
            "owner", "node", "owner__profile", "interface_set", "lease",
            "interface_set__host").distinct()


class VmPlainImageCreate(LoginRequiredMixin, TemplateView):
    form_class = VmFromPlainImageForm
    template_name = "dashboard/vm-plain-image-create.html"

    def get(self, request, *args, **kwargs):
        context = self.get_context_data(**kwargs)
        context.update({
            'form': VmFromPlainImageForm(request),
        })

        return self.render_to_response(context)

    def post(self, request, *args, **kwargs):
        server_created = None
        if request.POST.get("internet_access"):
            default_public_routed_net_id = DefaultPublicRoutedNet.get_id(request)
            server_created = openstack_api.nova.server_create(
                request,
                request.POST.get("name"),
                request.POST.get("image"),
                request.POST.get("flavor"),
                nics=({
                    'net-id': default_public_routed_net_id,
                },)
            )
        else:
            server_created = openstack_api.nova.server_create(
                request,
                request.POST.get("name"),
                request.POST.get("image"),
                request.POST.get("flavor"),
            )

        return HttpResponseRedirect("vm/%s#activity" % server_created.id)

class VmCreate(LoginRequiredMixin, TemplateView):

    form_class = VmCustomizeForm
    form = None

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

    def get_template(self, request, pk):
        try:
            template = InstanceTemplate.objects.get(
                pk=int(pk))
        except (ValueError, InstanceTemplate.DoesNotExist):
            raise Http404()
        if not request.user.id == template.owner_id:
            raise PermissionDenied()

        return template

    def get(self, request, form=None, *args, **kwargs):
        if form is None:
            template_pk = request.GET.get("template")
        else:
            template_pk = form.template.pk

        if template_pk:
            template = self.get_template(request, template_pk)
            if form is None:
                form = self.form_class(user=request.user, template=template)
        else:
            templates = InstanceTemplate.objects.filter(owner_id=self.request.user.id)

        images = openstack_api.glance.image_list_detailed(request)

        context = self.get_context_data(**kwargs)
        if template_pk:
            context.update({
                'template': 'dashboard/_vm-create-2.html',
                'box_title': _('Customize VM'),
                'ajax_title': True,
                'vm_create_form': form,
                'template_o': template,
            })
        else:
            context.update({
                'template': 'dashboard/_vm-create-1.html',
                'box_title': _('Create a VM'),
                'ajax_title': True,
                'templates': templates.all(),
                'template_access_types': TemplateAccessType.objects.exists(),
                'form': TemplateRequestForm(request=request)
            })
        return self.render_to_response(context)

    def __create_normal(self, request, template, *args, **kwargs):
        server_created = openstack_api.nova.server_create(
            request,
            template.name,
            template.image_id,
            template.flavor_id,
        )

        from dashboard.templatetags.instance_tags import get_absolute_url
        messages.success(request, _("VM successfully created."))
        path = get_absolute_url(server_created)

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

    def __create_customized(self, request, template, *args, **kwargs):
        user = request.user
        # no form yet, using POST directly:
        form = self.form_class(
            request.POST, user=request.user, template=template)
        if not form.is_valid():
            return self.get(request, form, *args, **kwargs)
        post = form.cleaned_data

        ikwargs = {
            'name': post['name'],
            'template': template,
            'owner': user,
        }
        amount = post.get("amount", 1)
        if request.user.has_perm('vm.set_resources'):
            networks = [InterfaceTemplate(vlan=l, managed=l.managed)
                        for l in post['networks']]

            ikwargs.update({
                'num_cores': post['cpu_count'],
                'ram_size': post['ram_size'],
                'priority': post['cpu_priority'],
                'max_ram_size': post['ram_size'],
                'networks': networks,
                'disks': list(template.disks.all()),
            })

        else:
            pass

        instances = Instance.mass_create_from_template(amount=amount,
                                                       **ikwargs)
        return self.__deploy(request, instances)

    def __deploy(self, request, instances, *args, **kwargs):
        # workaround EncodeError: dictionary changed size during iteration
        user = User.objects.get(pk=request.user.pk)
        for i in instances:
            i.deploy.async(user=user)

        if len(instances) > 1:
            messages.success(request, ungettext_lazy(
                "Successfully created %(count)d VM.",  # this should not happen
                "Successfully created %(count)d VMs.", len(instances)) % {
                                 'count': len(instances)})
            path = "%s?stype=owned" % reverse("dashboard.views.vm-list")
        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 HttpResponseRedirect("%s#activity" % path)

    def post(self, request, *args, **kwargs):
        #TODO: check if user can create VM
        #TODO: limit chekcs

        template = self.get_template(request, request.POST.get("template"))

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

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


# @require_GET
# def get_vm_screenshot(request, pk):
#     instance = get_object_or_404(Instance, pk=pk)
#     try:
#         image = instance.screenshot(user=request.user).getvalue()
#     except:
#         # TODO handle this better
#         raise Http404()
#
#     return HttpResponse(image, content_type="image/png")
#
#
# class InstanceActivityDetail(CheckedDetailView):
#     model = InstanceActivity
#     context_object_name = 'instanceactivity'  # much simpler to mock object
#     template_name = 'dashboard/instanceactivity_detail.html'
#
#     def get_has_level(self):
#         return self.object.instance.has_level
#
#     def get_context_data(self, **kwargs):
#         ctx = super(InstanceActivityDetail, self).get_context_data(**kwargs)
#         ctx['activities'] = _format_activities(
#             self.object.instance.get_activities(self.request.user))
#         ctx['icon'] = _get_activity_icon(self.object)
#         return ctx
#
#
# @require_GET
# def get_disk_download_status(request, pk):
#     disk = Disk.objects.get(pk=pk)
#     if not disk.get_appliance().has_level(request.user, 'owner'):
#         raise PermissionDenied()
#
#     return HttpResponse(
#         json.dumps({
#             'percentage': disk.get_download_percentage(),
#             'failed': disk.failed
#         }),
#         content_type="application/json",
#     )
#
#
# class ClientCheck(LoginRequiredMixin, TemplateView):
#
#     def get_template_names(self):
#         if self.request.is_ajax():
#             return ['dashboard/_modal.html']
#         else:
#             return ['dashboard/nojs-wrapper.html']
#
#     def get_context_data(self, *args, **kwargs):
#         context = super(ClientCheck, self).get_context_data(*args, **kwargs)
#         context.update({
#             'box_title': _('About CIRCLE Client'),
#             'ajax_title': False,
#             'client_download_url': settings.CLIENT_DOWNLOAD_URL,
#             'template': "dashboard/_client-check.html",
#             'instance': get_object_or_404(
#                 Instance, pk=self.request.GET.get('vm')),
#         })
#         if not context['instance'].has_level(self.request.user, 'user'):
#             raise PermissionDenied()
#         return context
#
#     def post(self, request, *args, **kwargs):
#         instance = get_object_or_404(Instance, pk=request.POST.get('vm'))
#         if not instance.has_level(request.user, 'operator'):
#             raise PermissionDenied()
#         response = redirect(instance.get_absolute_url())
#         response.set_cookie('downloaded_client', 'True', 365 * 24 * 60 * 60)
#         return response
#
#
@require_GET
def vm_activity(request, pk):
    instance = openstack_api.nova.server_get(request, pk)

    response = {}
    show_all = request.GET.get("show_all", "false") == "true"
    # activities = _format_activities(
    #     instance.get_merged_activities(request.user))
    # show_show_all = len(activities) > 10
    # if not show_all:
    #     activities = activities[:10]

#    response['connect_uri'] = instance.get_connect_uri()
#    response['human_readable_status'] = instance.get_status_display()
    response['status'] = instance.status
#    response['icon'] = instance.get_status_icon()
#    latest = instance.get_latest_activity_in_progress()
#    response['is_new_state'] = (latest and
#                                latest.resultant_state is not None and
#                                instance.status != latest.resultant_state)

    context = {
        'instance': instance,
        'activities': (),
        'show_show_all': False,
        'ops': get_operations(instance, request.user, request),
    }

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

    return HttpResponse(
        json.dumps(response),
        content_type="application/json"
    )
#
#
class FavouriteView(TemplateView):

    def post(self, *args, **kwargs):
        user_id = self.request.user.id
        vm_id = self.request.POST.get("vm")
        try:
            Favourite.objects.get(instance=vm_id, user=user_id).delete()
            return HttpResponse("Deleted.")
        except Favourite.DoesNotExist:
            Favourite(instance=vm_id, user=user_id).save()
            return HttpResponse("Added.")
#
#
# class TransferInstanceOwnershipConfirmView(TransferOwnershipConfirmView):
#     template = "dashboard/confirm/transfer-instance-ownership.html"
#     model = Instance
#
#     def change_owner(self, instance, new_owner):
#         with instance.activity(
#             code_suffix='ownership-transferred',
#                 readable_name=ugettext_noop("transfer ownership"),
#                 concurrency_check=False, user=new_owner):
#             super(TransferInstanceOwnershipConfirmView, self).change_owner(
#                 instance, new_owner)
#
#
# class TransferInstanceOwnershipView(TransferOwnershipView):
#     confirm_view = TransferInstanceOwnershipConfirmView
#     model = Instance
#     notification_msg = ugettext_noop(
#         '%(owner)s offered you to take the ownership of '
#         'his/her virtual machine called %(instance)s. '
#         '<a href="%(token)s" '
#         'class="btn btn-success btn-small">Accept</a>')
#     token_url = 'dashboard.views.vm-transfer-ownership-confirm'
#     template = "dashboard/vm-detail/tx-owner.html"
#
#
# @login_required
# def toggle_template_tutorial(request, pk):
#     hidden = request.POST.get("hidden", "").lower() == "true"
#     instance = get_object_or_404(Instance, pk=pk)
#     response = HttpResponseRedirect(instance.get_absolute_url())
#     response.set_cookie(  # for a week
#         "hide_tutorial_for_%s" % pk, hidden, 7 * 24 * 60 * 60)
#     return response
