#    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 oslo_middleware import cors
import pecan

from magnum.api import auth
from magnum.api import config as api_config
from magnum.api import middleware

# Register options for the service
API_SERVICE_OPTS = [
    cfg.PortOpt('port',
                default=9511,
                help='The port for the Magnum API server.'),
    cfg.IPOpt('host',
              default='127.0.0.1',
              help='The listen IP for the Magnum API server.'),
    cfg.IntOpt('max_limit',
               default=1000,
               help='The maximum number of items returned in a single '
                    'response from a collection resource.')
]

CONF = cfg.CONF
opt_group = cfg.OptGroup(name='api',
                         title='Options for the magnum-api service')
CONF.register_group(opt_group)
CONF.register_opts(API_SERVICE_OPTS, opt_group)


def get_pecan_config():
    # Set up the pecan configuration
    filename = api_config.__file__.replace('.pyc', '.py')
    return pecan.configuration.conf_from_file(filename)


def setup_app(config=None):
    if not config:
        config = get_pecan_config()

    app_conf = dict(config.app)

    app = pecan.make_app(
        app_conf.pop('root'),
        logging=getattr(config, 'logging', {}),
        wrap_app=middleware.ParsableErrorMiddleware,
        **app_conf
    )

    app = auth.install(app, CONF, config.app.acl_public_routes)

    # CORS must be the last one.
    app = cors.CORS(app, CONF)
    app.set_latent(
        allow_headers=['X-Auth-Token', 'X-Server-Management-Url'],
        allow_methods=['GET', 'PUT', 'POST', 'DELETE', 'PATCH'],
        expose_headers=['X-Auth-Token', 'X-Server-Management-Url']
    )

    return app
