# Copyright 2013 IBM Corp.
# 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.

import webob.exc

from nova.api.openstack.compute.schemas import versions as schema
from nova.api.openstack.compute import versions
from nova.api.openstack.compute.views import versions as views_versions
from nova.api.openstack import wsgi
from nova.api import validation


class VersionsController(wsgi.Controller):

    @wsgi.expected_errors(404)
    @validation.query_schema(schema.show_query)
    def show(self, req, id='v2.1'):
        builder = views_versions.get_view_builder(req)
        if req.is_legacy_v2():
            id = 'v2.0'
        if id not in versions.VERSIONS:
            raise webob.exc.HTTPNotFound()

        return builder.build_version(versions.VERSIONS[id])
