# Copyright 2012 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.

from tempest import config
from tempest.lib import auth
from tempest.lib import exceptions

CONF = config.CONF


class Manager(object):
    """Base manager class

    Manager objects are responsible for providing a configuration object
    and a client object for a test case to use in performing actions.
    """

    def __init__(self, credentials, scope='project'):
        """Initialization of base manager class

        Credentials to be used within the various client classes managed by the
        Manager object must be defined.

        :param credentials: An instance of `auth.Credentials`
        :param scope: default scope for tokens produced by the auth provider
        """
        self.credentials = credentials
        # Check if passed or default credentials are valid
        if not self.credentials.is_valid():
            raise exceptions.InvalidCredentials()
        self.auth_version = CONF.identity.auth_version
        # Creates an auth provider for the credentials
        self.auth_provider = get_auth_provider(
            self.credentials, pre_auth=True, scope=scope)


def get_auth_provider_class(credentials):
    if isinstance(credentials, auth.KeystoneV3Credentials):
        return auth.KeystoneV3AuthProvider, CONF.identity.uri_v3
    else:
        return auth.KeystoneV2AuthProvider, CONF.identity.uri


def get_auth_provider(credentials, pre_auth=False, scope='project'):
    default_params = {
        'disable_ssl_certificate_validation':
            CONF.identity.disable_ssl_certificate_validation,
        'ca_certs': CONF.identity.ca_certificates_file,
        'trace_requests': CONF.debug.trace_requests
    }
    if credentials is None:
        raise exceptions.InvalidCredentials(
            'Credentials must be specified')
    auth_provider_class, auth_url = get_auth_provider_class(
        credentials)
    _auth_provider = auth_provider_class(credentials, auth_url,
                                         scope=scope,
                                         **default_params)
    if pre_auth:
        _auth_provider.set_auth()
    return _auth_provider