# Copyright 2013 OpenStack 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.

from oslo_config import cfg

from keystone.catalog.backends import sql
from keystone.catalog import core as catalog_core
from keystone.common import dependency


CONF = cfg.CONF


@dependency.requires('catalog_api')
class EndpointFilterCatalog(sql.Catalog):
    def get_v3_catalog(self, user_id, project_id):
        substitutions = dict(CONF.items())
        substitutions.update({
            'tenant_id': project_id,
            'project_id': project_id,
            'user_id': user_id,
        })

        services = {}

        dict_of_endpoint_refs = (self.catalog_api.
                                 list_endpoints_for_project(project_id))

        if (not dict_of_endpoint_refs and
                CONF.endpoint_filter.return_all_endpoints_if_no_filter):
            return super(EndpointFilterCatalog, self).get_v3_catalog(
                user_id, project_id)

        for endpoint_id, endpoint in dict_of_endpoint_refs.items():
            if not endpoint['enabled']:
                # Skip disabled endpoints.
                continue
            service_id = endpoint['service_id']
            services.setdefault(
                service_id,
                self.get_service(service_id))
            service = services[service_id]
            del endpoint['service_id']
            del endpoint['enabled']
            del endpoint['legacy_endpoint_id']
            # Include deprecated region for backwards compatibility
            endpoint['region'] = endpoint['region_id']
            endpoint['url'] = catalog_core.format_url(
                endpoint['url'], substitutions)
            # populate filtered endpoints
            if 'endpoints' in services[service_id]:
                service['endpoints'].append(endpoint)
            else:
                service['endpoints'] = [endpoint]

        # format catalog
        catalog = []
        for service_id, service in services.items():
            formatted_service = {}
            formatted_service['id'] = service['id']
            formatted_service['type'] = service['type']
            formatted_service['name'] = service['name']
            formatted_service['endpoints'] = service['endpoints']
            catalog.append(formatted_service)

        return catalog
