#! /usr/bin/python3

#  ============LICENSE_START=======================================================
#  Copyright (C) 2020 Huawei Technologies Co., Ltd. All rights reserved.
#  Contribution (C) 2022 Aarna Networks, Inc. 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.
#  ============LICENSE_END=========================================================

import json
from flask import Flask, request, Response
from schematics.exceptions import DataError

from .utils import REST_PORT, LOGGING_LEVEL
from .SliceDataType import AllocateNssi, DeAllocateNssi, ActivateNssi, DeActivateNssi
from . import AuthManager
from . import NssManager


app = Flask(__name__)
app.logger.setLevel(LOGGING_LEVEL)


@app.errorhandler(DataError)
def handleRequestException(e):
    app.logger.error(e)
    response = Response()
    response.status_code = 400
    return response


@app.errorhandler(AuthManager.AuthError)
def handleAuthException(e):
    app.logger.error(e)
    response = Response()
    response.status_code = 400
    return response


@app.errorhandler(AuthManager.TokenError)
def handleAuthException(e):
    app.logger.error(e)
    response = Response()
    response.status_code = 401
    return response


@app.errorhandler(NssManager.NssError)
def handleNssException(e):
    app.logger.error(e)
    response = Response()
    response.status_code = 400
    return response


@app.route("/api/rest/securityManagement/v1/oauth/token", methods=['POST'])
def handleAuthToken():
    """
        Used to get Access Token by SO NSSMF adapter.
    """
    app.logger.debug("Receive request:\n%s" % json.dumps(request.json, indent=2))

    AuthManager.AuthRequest(request.json).validate()
    AuthManager.checkAuth(request.json)

    return AuthManager.generateAuthToken(request.json), 201


@app.route("/ObjectManagement/NSS/SliceProfiles", methods=['POST'])
def handleAllocateNssi():
    AuthManager.checkAuthToken(request.headers)

    app.logger.info("Receive AllocateNssi request:\n%s" % json.dumps(request.json, indent=2))

    AllocateNssi(request.json).validate()

    return NssManager.allocateNssi(request.json), 200


@app.route("/ObjectManagement/NSS/SliceProfiles/<string:sliceProfileId>", methods=['DELETE'])
def handleDeallocateNssi(sliceProfileId):
    AuthManager.checkAuthToken(request.headers)

    app.logger.info("Receive DeallocateNssi request for sliceProfileId %s:\n%s"
                    % (sliceProfileId, json.dumps(request.json, indent=2)))

    DeAllocateNssi(request.json).validate()

    return NssManager.deallocateNssi(sliceProfileId, request.json), 200

@app.route("/api/rest/provMns/v1/an/NSS/<string:snssai>/activations", methods=['PUT'])
def handleActivateNssi(snssai):
    """
        Method: handleActivateNssi
            This method handles slice activation event generated by SO NSSMF adapter.
            As part of this event, SO NSSMF adapter will send the associated 'snssai'.
            'snssai' is string type value and example is: "01-2557D9". Wherein,
            sst: "01" and sd: "2557D9".
        Argument: snssai
            'sst': Identifies the service (e.g eMBB, URLLC,...)
            'sd' : service differentiator within sst.
        Return value: http status 200
    """
    AuthManager.checkAuthToken(request.headers)

    app.logger.info("Receive ActivateNssi request for snssai:%s\n%s"
                    % (snssai, json.dumps(request.json, indent=2)))

    ActivateNssi(request.json).validate()

    return NssManager.activateNssi(snssai, request.json), 200

@app.route("/api/rest/provMns/v1/an/NSS/<string:snssai>/deactivation", methods=['PUT'])
def handleDeActivateNssi(snssai):
    """
        Method: handleDeActivateNssi
            This method handles slice deactivation event generated by SO NSSMF adapter.
            As part of this event, SO NSSMF adapter will send the associated 'snssai'.
            Example 'snssai' : "01-2557D9".
        Argument: snssai
            'sst': Identifies the service (e.g eMBB, URLLC,...)
            'sd' : service differentiator within sst.
        Return value: http status 200
    """
    AuthManager.checkAuthToken(request.headers)

    app.logger.info("Receive DeActivateNssi request for snssai:%s\n%s"
                    % (snssai, json.dumps(request.json, indent=2)))

    DeActivateNssi(request.json).validate()

    return NssManager.deactivateNssi(snssai, request.json), 200

def main():
    AuthManager.startAuthManagerJob()
    app.run("0.0.0.0", REST_PORT, False, ssl_context="adhoc")


if __name__ == '__main__':
    main()