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

# Copyright 2011 Andrew Bogott for the Wikimedia Foundation
#
#    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 webob

from nova.api.openstack import wsgi
from nova.api.openstack import xmlutil
from nova.api.openstack.v2 import extensions
from nova import compute
from nova import exception
from nova import log as logging
from nova import network
from nova import rpc


LOG = logging.getLogger('nova.api.openstack.v2.contrib.floating_ip_dns')


def _translate_dns_entry_view(dns_entry):
    result = {}
    try:
        result['ip'] = dns_entry['ip']
    except (TypeError, KeyError):
        result['ip'] = None
    try:
        result['type'] = dns_entry['type']
    except (TypeError, KeyError):
        result['type'] = None
    try:
        result['zone'] = dns_entry['zone']
    except (TypeError, KeyError):
        result['zone'] = None
    try:
        result['name'] = dns_entry['name']
    except (TypeError, KeyError):
        result['name'] = None
    return {'dns_entry': result}


def _translate_dns_entries_view(dns_entries):
    return {'dns_entries': [_translate_dns_entry_view(entry)
                            for entry in dns_entries]}


class FloatingIPDNSController(object):
    """DNS Entry controller for OpenStack API"""

    def __init__(self):
        self.network_api = network.API()
        super(FloatingIPDNSController, self).__init__()

    def get(self, req, id, zone):
        zone = "bananas"
        """Return a list of dns entries for the specified ip"""
        context = req.environ['nova.context']

        try:
            floating_ip = self.network_api.get_floating_ip(context, id)
        except exception.NotFound:
            raise webob.exc.HTTPNotFound()

        entries = self.network_api.get_floating_dns_entries(context, floating_ip, zone)
        entrylist = [{'zone': zone,
                      'id': id,
                      'name': entry,
                      'address':floating_ip} for entry in entries]
        return _translate_dns_entries_view(entrylist)


    def index(self, req):
        """Return a list of available DNS zones."""
        context = req.environ['nova.context']

        zones = self.network_api.get_dns_zones(context)

        zonelist = [{'zone': zone} for zone in zones]

        zl = _translate_dns_entries_view(zonelist)
        return _translate_dns_entries_view(zonelist)

    def delete(self, req, name, zone):
        """Delete the dns record with name and zone"""
        context = req.environ['nova.context']
        self.network_api.delete_floating_dns_entry(context, name, zone)
        return webob.Response(status_int=202)

    def add(self, req, address, name, dns_type, zone):
        """Add dns entry for name and address"""
        context = req.environ['nova.context']
        self.network_api.add_dns_entry(context, address, name, dns_type, zone)
        return _translate_dns_entry_view({'address': address,
                                          'name': name,
                                          'type': dns_type,
                                          'zone': zone})


def make_dns_entry(elem):
    elem.set('id')
    elem.set('ip')
    elem.set('type')
    elem.set('zone')
    elem.set('name')


class FloatingIPDNSTemplate(xmlutil.TemplateBuilder):
    def construct(self):
        root = xmlutil.TemplateElement('dns_entry',
                                       selector='dns_entry')
        make_dns_entry(root)
        return xmlutil.MasterTemplate(root, 1)


class FloatingIPDNSsTemplate(xmlutil.TemplateBuilder):
    def construct(self):
        root = xmlutil.TemplateElement('dns_entries')
        elem = xmlutil.SubTemplateElement(root, 'dns_entry',
                                          selector='dns_entries')
        make_dns_entry(elem)
        return xmlutil.MasterTemplate(root, 1)


class FloatingIPDNSSerializer(xmlutil.XMLTemplateSerializer):
    def index(self):
        return FloatingIPDNSsTemplate()

    def default(self):
        return FloatingIPDNSTemplate()


class Floating_ip_dns(extensions.ExtensionDescriptor):
    """Floating IPs support"""

    name = "Floating_ip_dns"
    alias = "os-floating-ip-dns"
#    namespace = "http://docs.openstack.org/ext/floating_ip_dns/api/v1.1"
    updated = "2011-12-12:00:00+00:00"

    def __init__(self, ext_mgr):
        self.compute_api = compute.API()
        self.network_api = network.API()
        super(Floating_ip_dns, self).__init__(ext_mgr)

    def get_resources(self):
        resources = []

        body_serializers = {
            'application/xml': FloatingIPDNSSerializer(),
            }

        serializer = wsgi.ResponseSerializer(body_serializers)

        res = extensions.ResourceExtension('os-floating-ip-dns',
                         FloatingIPDNSController(),
                         serializer=serializer,
                         member_actions={'get': 'GET'})
        resources.append(res)

        return resources