# Copyright 2017 AT&T Intellectual Property.  All other 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.

import falcon

from promenade.control.base import BaseResource, PromenadeRequest
from promenade.control.health_api import HealthResource
from promenade.control.join_scripts import JoinScriptsResource
from promenade.control.middleware import (AuthMiddleware, ContextMiddleware,
                                          LoggingMiddleware)
from promenade import exceptions as exc
from promenade import logging

LOG = logging.getLogger(__name__)


def start_api():
    middlewares = [
        AuthMiddleware(),
        ContextMiddleware(),
        LoggingMiddleware(),
    ]
    control_api = falcon.API(
        request_type=PromenadeRequest, middleware=middlewares)

    # v1.0 of Promenade API
    v1_0_routes = [
        # API for managing region data
        ('/health', HealthResource()),
        ('/join-scripts', JoinScriptsResource()),
    ]

    # Set up the 1.0 routes
    route_v1_0_prefix = '/api/v1.0'
    for path, res in v1_0_routes:
        route = '{}{}'.format(route_v1_0_prefix, path)
        LOG.info('Adding route: %s Handled by %s', route,
                 res.__class__.__name__)
        control_api.add_route(route, res)

    control_api.add_route('/versions', VersionsResource())

    # Error handlers (FILO handling)
    control_api.add_error_handler(Exception, exc.default_exception_handler)
    control_api.add_error_handler(exc.PromenadeException,
                                  exc.PromenadeException.handle)

    # built-in error serializer
    control_api.set_error_serializer(exc.default_error_serializer)

    return control_api


class VersionsResource(BaseResource):
    """
    Lists the versions supported by this API
    """

    def on_get(self, req, resp):
        resp.body = self.to_json({
            'v1.0': {
                'path': '/api/v1.0',
                'status': 'stable'
            }
        })
        resp.status = falcon.HTTP_200