# Copyright 2022-2023 ETSI TeraFlowSDN - TFS OSG (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.

import json, logging
import pyangbind.lib.pybindJSON as pybindJSON
from flask import request
from flask.json import jsonify
from flask_restful import Resource
from common.Constants import DEFAULT_CONTEXT_NAME, DEFAULT_TOPOLOGY_NAME
from common.tools.context_queries.Topology import get_topology_details
from context.client.ContextClient import ContextClient
from nbi.service.rest_server.nbi_plugins.tools.Authentication import HTTP_AUTH
from nbi.service.rest_server.nbi_plugins.tools.HttpStatusCodes import HTTP_OK, HTTP_SERVERERROR
from .bindings import ietf_network
from .ComposeNetwork import compose_network
from .ManualFixes import manual_fixes

LOGGER = logging.getLogger(__name__)

TE_TOPOLOGY_NAMES = [
    'providerId-10-clientId-0-topologyId-1',
    'providerId-10-clientId-0-topologyId-2'
]

class Networks(Resource):
    @HTTP_AUTH.login_required
    def get(self):
        LOGGER.info('Request: {:s}'.format(str(request)))
        topology_id = ''
        try:
            context_client = ContextClient()
            #target = get_slice_by_uuid(context_client, vpn_id, rw_copy=True)
            #if target is None:
            #    raise Exception('VPN({:s}) not found in database'.format(str(vpn_id)))

            ietf_nets = ietf_network()

            topology_details = get_topology_details(
                context_client, DEFAULT_TOPOLOGY_NAME, context_uuid=DEFAULT_CONTEXT_NAME, #rw_copy=True
            )
            if topology_details is None:
                MSG = 'Topology({:s}/{:s}) not found'
                raise Exception(MSG.format(DEFAULT_CONTEXT_NAME, DEFAULT_TOPOLOGY_NAME))

            for te_topology_name in TE_TOPOLOGY_NAMES:
                ietf_net = ietf_nets.networks.network.add(te_topology_name)
                compose_network(ietf_net, te_topology_name, topology_details)

            # TODO: improve these workarounds to enhance performance
            json_response = json.loads(pybindJSON.dumps(ietf_nets, mode='ietf'))
            
            # Workaround; pyangbind does not allow to set otn_topology / eth-tran-topology
            manual_fixes(json_response)

            response = jsonify(json_response)
            response.status_code = HTTP_OK
        except Exception as e: # pylint: disable=broad-except
            LOGGER.exception('Something went wrong Retrieving Topology({:s})'.format(str(topology_id)))
            response = jsonify({'error': str(e)})
            response.status_code = HTTP_SERVERERROR
        return response
