#    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 os

from oslo_config import cfg
from oslo_log import log
from paste import deploy
import pecan

from magnum.api import config as api_config
from magnum.api import middleware
from magnum.common import config as common_config
import magnum.conf

CONF = magnum.conf.CONF

LOG = log.getLogger(__name__)


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)
    common_config.set_config_defaults()

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

    return app


def load_app():
    cfg_file = None
    cfg_path = CONF.api.api_paste_config
    if not os.path.isabs(cfg_path):
        cfg_file = CONF.find_file(cfg_path)
    elif os.path.exists(cfg_path):
        cfg_file = cfg_path

    if not cfg_file:
        raise cfg.ConfigFilesNotFoundError([CONF.api.api_paste_config])
    LOG.info("Full WSGI config used: %s", cfg_file)
    return deploy.loadapp("config:" + cfg_file)


def app_factory(global_config, **local_conf):
    return setup_app()