# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# 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.

"""
WSGI middleware for OpenStack Compute API.
"""

from oslo.config import cfg

import nova.api.openstack
from nova.api.openstack.compute import consoles
from nova.api.openstack.compute import extensions
from nova.api.openstack.compute import flavors
from nova.api.openstack.compute import image_metadata
from nova.api.openstack.compute import images
from nova.api.openstack.compute import ips
from nova.api.openstack.compute import limits
from nova.api.openstack.compute import plugins
from nova.api.openstack.compute import server_metadata
from nova.api.openstack.compute import servers
from nova.api.openstack.compute import versions

allow_instance_snapshots_opt = cfg.BoolOpt('allow_instance_snapshots',
        default=True,
        help='Permit instance snapshot operations.')

CONF = cfg.CONF
CONF.register_opt(allow_instance_snapshots_opt)


class APIRouter(nova.api.openstack.APIRouter):
    """Routes requests on the OpenStack API to the appropriate controller
    and method.
    """
    ExtensionManager = extensions.ExtensionManager

    def _setup_routes(self, mapper, ext_mgr, init_only):
        if init_only is None or 'versions' in init_only:
            self.resources['versions'] = versions.create_resource()
            mapper.connect("versions", "/",
                        controller=self.resources['versions'],
                        action='show',
                        conditions={"method": ['GET']})

        mapper.redirect("", "/")

        if init_only is None or 'consoles' in init_only:
            self.resources['consoles'] = consoles.create_resource()
            mapper.resource("console", "consoles",
                        controller=self.resources['consoles'],
                        parent_resource=dict(member_name='server',
                        collection_name='servers'))

        if init_only is None or 'consoles' in init_only or \
                'servers' in init_only or 'ips' in init_only:
            self.resources['servers'] = servers.create_resource(ext_mgr)
            mapper.resource("server", "servers",
                            controller=self.resources['servers'],
                            collection={'detail': 'GET'},
                            member={'action': 'POST'})

        if init_only is None or 'ips' in init_only:
            self.resources['ips'] = ips.create_resource()
            mapper.resource("ip", "ips", controller=self.resources['ips'],
                            parent_resource=dict(member_name='server',
                                                 collection_name='servers'))

        if init_only is None or 'images' in init_only:
            self.resources['images'] = images.create_resource()
            mapper.resource("image", "images",
                            controller=self.resources['images'],
                            collection={'detail': 'GET'})

        if init_only is None or 'limits' in init_only:
            self.resources['limits'] = limits.create_resource()
            mapper.resource("limit", "limits",
                            controller=self.resources['limits'])

        if init_only is None or 'flavors' in init_only:
            self.resources['flavors'] = flavors.create_resource()
            mapper.resource("flavor", "flavors",
                            controller=self.resources['flavors'],
                            collection={'detail': 'GET'},
                            member={'action': 'POST'})

        if init_only is None or 'image_metadata' in init_only:
            self.resources['image_metadata'] = image_metadata.create_resource()
            image_metadata_controller = self.resources['image_metadata']

            mapper.resource("image_meta", "metadata",
                            controller=image_metadata_controller,
                            parent_resource=dict(member_name='image',
                            collection_name='images'))

            mapper.connect("metadata",
                           "/{project_id}/images/{image_id}/metadata",
                           controller=image_metadata_controller,
                           action='update_all',
                           conditions={"method": ['PUT']})

        if init_only is None or 'server_metadata' in init_only:
            self.resources['server_metadata'] = \
                server_metadata.create_resource()
            server_metadata_controller = self.resources['server_metadata']

            mapper.resource("server_meta", "metadata",
                            controller=server_metadata_controller,
                            parent_resource=dict(member_name='server',
                            collection_name='servers'))

            mapper.connect("metadata",
                           "/{project_id}/servers/{server_id}/metadata",
                           controller=server_metadata_controller,
                           action='update_all',
                           conditions={"method": ['PUT']})


class APIRouterV21(nova.api.openstack.APIRouterV21):
    """Routes requests on the OpenStack API to the appropriate controller
    and method.
    """
    def __init__(self, init_only=None):
        self._loaded_extension_info = plugins.LoadedExtensionInfo()
        super(APIRouterV21, self).__init__(init_only)

    def _register_extension(self, ext):
        return self.loaded_extension_info.register_extension(ext.obj)

    @property
    def loaded_extension_info(self):
        return self._loaded_extension_info


# NOTE(oomichi): Now v3 API tests use APIRouterV3. After moving all v3
# API extensions to v2.1 API, we can remove this class.
class APIRouterV3(nova.api.openstack.APIRouterV21):
    """Routes requests on the OpenStack API to the appropriate controller
    and method.
    """
    def __init__(self, init_only=None):
        self._loaded_extension_info = plugins.LoadedExtensionInfo()
        super(APIRouterV3, self).__init__(init_only, v3mode=True)

    def _register_extension(self, ext):
        return self.loaded_extension_info.register_extension(ext.obj)

    @property
    def loaded_extension_info(self):
        return self._loaded_extension_info
