# Copyright 2013 OpenStack Foundation
# All Rights Reserved.
#
#    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.

"""
/hosts endpoint for Escalator v1 API
"""
from oslo.log import log as logging
from escalator import i18n
from escalator import notifier
from escalator.common import utils
from escalator.common import wsgi
from escalator.version import version_info


LOG = logging.getLogger(__name__)
_ = i18n._
_LE = i18n._LE
_LI = i18n._LI
_LW = i18n._LW


class Controller():
    """
    WSGI controller for hosts resource in Escalator v1 API

    """
    def __init__(self):
        self.notifier = notifier.Notifier()

    @utils.mutating
    def version(self, req, version):
        """
        Get version of esclator.
        :param req: The WSGI/Webob Request object
        """
        if version.get('type') == 'pbr':
            return {"escalator_version":
                    version_info.version_string_with_vcs()}
        else:
            # reserved for external version
            return {"escalator_version": '1.0.0-1.1.0'}


class VersionDeserializer(wsgi.JSONRequestDeserializer):
    """Handles deserialization of specific controller method requests."""

    def _deserialize(self, request):
        result = {}
        result['file_meta'] = utils.get_dict_meta(request)
        return result

    def version(self, request):
        result = {}
        result['version'] = utils.get_dict_meta(request)
        return result


class VersionSerializer(wsgi.JSONResponseSerializer):
    """Handles serialization of specific controller method responses."""

    def __init__(self):
        self.notifier = notifier.Notifier()

    def version(self, response, result):
        response.status = 201
        response.headers['Content-Type'] = 'application/json'
        response.body = self.to_json(result)
        return response


def create_resource():
    """Version resource factory method"""
    deserializer = VersionDeserializer()
    serializer = VersionSerializer()
    return wsgi.Resource(Controller(), deserializer, serializer)