#   Copyright 2014 VMWare.
#
#   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 logging

import keystoneclient

from congressclient.common import utils

LOG = logging.getLogger(__name__)

DEFAULT_COMPUTE_API_VERSION = '1'
API_VERSION_OPTION = 'os_policy_api_version'
API_NAME = 'congressclient'
API_VERSIONS = {
    '1': 'congressclient.v1.client.Client',
}


def make_client(instance):
    """Returns a congress service client."""
    congress_client = utils.get_client_class(
        API_NAME,
        instance._api_version[API_NAME],
        API_VERSIONS)
    auth = keystoneclient.auth.identity.v2.Password(
        auth_url=instance._auth_url,
        username=instance._username,
        password=instance._password, tenant_name=instance._project_name)
    session = keystoneclient.session.Session(auth=auth)
    LOG.debug('instantiating congress client: %s', congress_client)
    return congress_client(session=session,
                           auth=None,
                           interface='publicURL',
                           service_type='policy',
                           region_name=instance._region_name)


def build_option_parser(parser):
    """Hook to add global options."""
    parser.add_argument(
        '--os-policy-api-version',
        metavar='<policy-api-version>',
        default=utils.env(
            'OS_POLICY_API_VERSION',
            default=DEFAULT_COMPUTE_API_VERSION),
        help='Policy API version, default=' +
             DEFAULT_COMPUTE_API_VERSION +
             ' (Env: OS_POLICY_API_VERSION)')
    return parser
