# 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 grpc, logging
from common.Constants import ServiceNameEnum
from common.Settings import get_service_host, get_service_port_grpc
from common.proto.context_pb2 import Empty, Service, ServiceId
from common.proto.service_pb2_grpc import ServiceServiceStub
from common.proto.bgpls_pb2_grpc import BgplsServiceStub
from common.proto.bgpls_pb2 import BgplsSpeaker, DiscoveredDeviceList,DiscoveredLinkList,BgplsSpeakerId, NodeDescriptors
from common.tools.client.RetryDecorator import retry, delay_exponential
from common.tools.grpc.Tools import grpc_message_to_json_string

LOGGER = logging.getLogger(__name__)
MAX_RETRIES = 15
DELAY_FUNCTION = delay_exponential(initial=0.01, increment=2.0, maximum=5.0)
RETRY_DECORATOR = retry(max_retries=MAX_RETRIES, delay_function=DELAY_FUNCTION, prepare_method_name='connect')

class BgplsClient:
    def __init__(self, host=None, port=None):
        if not host: host = get_service_host(ServiceNameEnum.BGPLS)
        if not port: port = get_service_port_grpc(ServiceNameEnum.BGPLS)
        self.endpoint = '{:s}:{:s}'.format(str(host), str(port))
        LOGGER.info('Creating channel to {:s}...'.format(str(self.endpoint)))
        self.channel = None
        self.stub = None
        self.connect()
        LOGGER.info('Channel created')

    def connect(self):
        self.channel = grpc.insecure_channel(self.endpoint)
        self.stub = BgplsServiceStub(self.channel)

    def close(self):
        if self.channel is not None: self.channel.close()
        self.channel = None
        self.stub = None

    @RETRY_DECORATOR
    def ListDiscoveredDevices(self, request: Empty) -> DiscoveredDeviceList:
        LOGGER.info('ListDiscoveredDevices request: {:s}'.format(grpc_message_to_json_string(request)))
        response = self.stub.ListDiscoveredDevices(request)
        LOGGER.info('ListDiscoveredDevices result: {:s}'.format(grpc_message_to_json_string(response)))
        return response    
    @RETRY_DECORATOR
    def ListDiscoveredLinks(self, request: Empty) -> DiscoveredLinkList:
        LOGGER.info('ListDiscoveredDevices request: {:s}'.format(grpc_message_to_json_string(request)))
        response = self.stub.ListDiscoveredLinks(request)
        LOGGER.info('ListDiscoveredDevices result: {:s}'.format(grpc_message_to_json_string(response)))
        return response
    @RETRY_DECORATOR
    def AddBgplsSpeaker(self, request: BgplsSpeaker) -> str:
        LOGGER.info('AddBgplsSpeaker request: {:s}'.format(grpc_message_to_json_string(request)))
        response = self.stub.AddBgplsSpeaker(request)
        LOGGER.info('AddBgplsSpeaker result: {:s}'.format(grpc_message_to_json_string(response)))
        return response    
    @RETRY_DECORATOR
    def ListBgplsSpeakers(self, request: Empty) -> BgplsSpeakerId:
        LOGGER.info('ListBgplsSpeakers request: {:s}'.format(grpc_message_to_json_string(request)))
        response = self.stub.ListBgplsSpeakers(request)
        LOGGER.info('ListBgplsSpeakers result: {:s}'.format(grpc_message_to_json_string(response)))
        return response
    @RETRY_DECORATOR
    def DisconnectFromSpeaker(self, request: BgplsSpeaker) -> bool:
        LOGGER.info('DisconnectFromSpeaker request: {:s}'.format(grpc_message_to_json_string(request)))
        response = self.stub.DisconnectFromSpeaker(request)
        LOGGER.info('DisconnectFromSpeaker result: {:s}'.format(grpc_message_to_json_string(response)))
        return response
    @RETRY_DECORATOR
    def GetSpeakerInfoFromId(self, request: BgplsSpeakerId) -> BgplsSpeaker:
        LOGGER.info('GetSpeakerInfoFromId request: {:s}'.format(grpc_message_to_json_string(request)))
        response = self.stub.GetSpeakerInfoFromId(request)
        LOGGER.info('GetSpeakerInfoFromId result: {:s}'.format(grpc_message_to_json_string(response)))
        return response
    @RETRY_DECORATOR
    def NotifyAddNodeToContext(self, request: NodeDescriptors) -> str:
        LOGGER.info('NotifyAddNodeToContext request: {:s}'.format(grpc_message_to_json_string(request)))
        response = self.stub.NotifyAddNodeToContext(request)
        LOGGER.info('NotifyAddNodeToContext result: {:s}'.format(grpc_message_to_json_string(response)))
        return response
