# Copyright 2022-2025 ETSI SDG TeraFlowSDN (TFS) (https://tfs.etsi.org/)
#
# 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.

# Mock IETF ACTN SDN controller
# -----------------------------
# REST server implementing minimal support for:
# - IETF YANG Data Model for Transport Network Client Signals
#       Ref: https://www.ietf.org/archive/id/draft-ietf-ccamp-client-signal-yang-10.html
# - IETF YANG Data Model for Traffic Engineering Tunnels, Label Switched Paths and Interfaces
#       Ref: https://www.ietf.org/archive/id/draft-ietf-teas-yang-te-34.html


import functools, logging, sys, time
from flask import Flask, jsonify, make_response, request
from flask_restful import Api, Resource
from ResourceApps import Apps, App
from ResourceAppFlows import AppFlows, AppFlow

BIND_ADDRESS = "0.0.0.0"
BIND_PORT = 8443
BASE_URL = "/restconf/v1/data/app-flows"
STR_ENDPOINT = "http://{:s}:{:s}{:s}".format(
    str(BIND_ADDRESS), str(BIND_PORT), str(BASE_URL)
)
LOG_LEVEL = logging.DEBUG

logging.basicConfig(
    level=LOG_LEVEL, format="[%(asctime)s] %(levelname)s:%(name)s:%(message)s"
)
LOGGER = logging.getLogger(__name__)

logging.getLogger("werkzeug").setLevel(logging.WARNING)


def log_request(logger: logging.Logger, response):
    timestamp = time.strftime("[%Y-%b-%d %H:%M]")
    logger.info(
        "%s %s %s %s %s",
        timestamp,
        request.remote_addr,
        request.method,
        request.full_path,
        response.status,
    )
    return response


class Health(Resource):
    def get(self):
        return make_response(jsonify({}), 200)


def main():
    LOGGER.info("Starting...")

    app = Flask(__name__)
    app.after_request(functools.partial(log_request, LOGGER))

    api = Api(app, prefix=BASE_URL)
    api.add_resource(Health, "/")
    api.add_resource(Apps, BASE_URL + "/apps")
    api.add_resource(App, BASE_URL + "/application=<string:app_name>")
    api.add_resource(AppFlows, BASE_URL)
    api.add_resource(AppFlow, BASE_URL + "/app-flow=<string:app_name>")

    LOGGER.info("Listening on {:s}...".format(str(STR_ENDPOINT)))
    app.run(debug=True, host=BIND_ADDRESS, port=BIND_PORT, ssl_context="adhoc")

    LOGGER.info("Bye")
    return 0


if __name__ == "__main__":
    sys.exit(main())