# Copyright 2012 NEC Corporation
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

import logging

from django.conf import settings
from django.core.urlresolvers import reverse
from django.utils.translation import ugettext_lazy as _

from horizon import exceptions
from horizon import forms
from horizon import messages

from openstack_dashboard import api


LOG = logging.getLogger(__name__)
VNIC_TYPES = [('normal', _('Normal')), ('direct', _('Direct')),
              ('macvtap', _('MacVTap'))]


class UpdatePort(forms.SelfHandlingForm):
    network_id = forms.CharField(widget=forms.HiddenInput())
    port_id = forms.CharField(label=_("ID"),
                              widget=forms.TextInput(
                              attrs={'readonly': 'readonly'}))
    name = forms.CharField(max_length=255,
                           label=_("Name"),
                           required=False)
    admin_state = forms.ThemableChoiceField(
        choices=[(True, _('UP')),
                 (False, _('DOWN'))],
        label=_("Admin State"))
    failure_url = 'horizon:project:networks:detail'

    def __init__(self, request, *args, **kwargs):
        super(UpdatePort, self).__init__(request, *args, **kwargs)
        try:
            if api.neutron.is_extension_supported(request, 'binding'):
                neutron_settings = getattr(settings,
                                           'OPENSTACK_NEUTRON_NETWORK', {})
                supported_vnic_types = neutron_settings.get(
                    'supported_vnic_types', ['*'])
                if supported_vnic_types:
                    if supported_vnic_types == ['*']:
                        vnic_type_choices = VNIC_TYPES
                    else:
                        vnic_type_choices = [
                            vnic_type for vnic_type in VNIC_TYPES
                            if vnic_type[0] in supported_vnic_types
                        ]

                    self.fields['binding__vnic_type'] = forms.ChoiceField(
                        choices=vnic_type_choices,
                        label=_("Binding: VNIC Type"),
                        help_text=_(
                            "The VNIC type that is bound to the neutron port"),
                        required=False)
        except Exception:
            msg = _("Unable to verify the VNIC types extension in Neutron")
            exceptions.handle(self.request, msg)

        try:
            if api.neutron.is_extension_supported(request, 'mac-learning'):
                self.fields['mac_state'] = forms.BooleanField(
                    label=_("MAC Learning State"), initial=False,
                    required=False)
        except Exception:
            msg = _("Unable to retrieve MAC learning state")
            exceptions.handle(self.request, msg)

    def handle(self, request, data):
        data['admin_state'] = (data['admin_state'] == 'True')
        try:
            LOG.debug('params = %s' % data)
            extension_kwargs = {}
            if 'binding__vnic_type' in data:
                extension_kwargs['binding__vnic_type'] = \
                    data['binding__vnic_type']
            if 'mac_state' in data:
                extension_kwargs['mac_learning_enabled'] = data['mac_state']
            port = api.neutron.port_update(request,
                                           data['port_id'],
                                           name=data['name'],
                                           admin_state_up=data['admin_state'],
                                           **extension_kwargs)
            msg = _('Port %s was successfully updated.') % data['port_id']
            LOG.debug(msg)
            messages.success(request, msg)
            return port
        except Exception:
            msg = _('Failed to update port %s') % data['port_id']
            LOG.info(msg)
            redirect = reverse(self.failure_url,
                               args=[data['network_id']])
            exceptions.handle(request, msg, redirect=redirect)
