# Copyright 2021-2023 H2020 TeraFlow (https://www.teraflow-h2020.eu/)
#
# 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 logging

import grpc

from common.proto.context_pb2 import Empty
from common.proto.optical_attack_detector_pb2_grpc import \
    OpticalAttackDetectorServiceStub
from common.Settings import get_setting
from common.tools.client.RetryDecorator import delay_exponential, retry
from common.tools.grpc.Tools import grpc_message_to_json

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 OpticalAttackDetectorClient:
    def __init__(self, host=None, port=None):
        if not host:
            host = get_setting(
                "OPTICALATTACKDETECTORSERVICE_SERVICE_HOST", default="DBSCANSERVING"
            )
        if not port:
            port = get_setting(
                "OPTICALATTACKDETECTORSERVICE_SERVICE_PORT_GRPC", default=10007
            )
        self.endpoint = "{:s}:{:s}".format(str(host), str(port))
        LOGGER.debug("Creating channel to {:s}...".format(str(self.endpoint)))
        self.channel = None
        self.stub = None
        self.connect()
        LOGGER.debug("Channel created")

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

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

    @RETRY_DECORATOR
    def DetectAttack(self, request: Empty) -> Empty:
        LOGGER.debug(
            "DetectAttack request: {:s}".format(str(grpc_message_to_json(request)))
        )
        response = self.stub.DetectAttack(request)
        LOGGER.debug(
            "DetectAttack result: {:s}".format(str(grpc_message_to_json(response)))
        )
        return response
