# Copyright (c) 2019 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 oslo_serialization import jsonutils

import six

from fenix import context
from fenix import exceptions


def ctx_from_headers(headers):
    try:
        service_catalog = jsonutils.loads(headers['X-Service-Catalog'])
    except KeyError:
        raise exceptions.ServiceCatalogNotFound()
    except TypeError:
        raise exceptions.WrongFormat()
    if 'X-User-Id' in headers:
        user_id = headers['X-User-Id']
    else:
        user_id = None
    if 'X-Project-Id' in headers:
        project_id = headers['X-Project-Id']
    else:
        project_id = None
    if 'X-Auth-Token' in headers:
        auth_token = headers['X-Auth-Token']
    else:
        auth_token = None
    if 'X-User-Name' in headers:
        user_name = headers['X-User-Name']
    else:
        user_name = None
    if 'X-Project-Name' in headers:
        project_name = headers['X-Project-Name']
    else:
        project_name = None
    if 'X-Project-Name' in headers:
        project_name = headers['X-Project-Name']
    else:
        project_name = None
    if 'X-Roles' in headers:
        roles = list(map(six.text_type.strip, headers['X-Roles'].split(',')))
    else:
        roles = None
    return context.FenixContext(
        user_id=user_id,
        project_id=project_id,
        auth_token=auth_token,
        user_name=user_name,
        project_name=project_name,
        roles=roles,
        service_catalog=service_catalog
    )