# Copyright 2022-2024 ETSI OSG/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.

import grpc
import json
import logging
import threading
from common.tools.kafka.Variables import KafkaConfig, KafkaTopic

from common.proto.kpi_value_api_pb2 import KpiValue
from common.proto.kpi_manager_pb2 import KpiDescriptor, KpiId
from common.proto.kpi_manager_pb2_grpc import KpiManagerServiceStub

from confluent_kafka import KafkaError
from confluent_kafka import Consumer as KafkaConsumer

from kpi_manager.client.KpiManagerClient import KpiManagerClient
from monitoring.service.NameMapping import NameMapping
from kpi_manager.service.KpiManagerService import KpiManagerService


LOGGER           = logging.getLogger(__name__)
ACTIVE_CONSUMERS = []

class KpiValueWriter:

    @staticmethod
    def RunKafkaConsumer():
        thread = threading.Thread(target=KpiValueWriter.KafkaConsumer, args=())
        ACTIVE_CONSUMERS.append(thread)
        thread.start()

    @staticmethod
    def KafkaConsumer():
        kafka_consumer  = KafkaConsumer(
            { 'bootstrap.servers' : KafkaConfig.SERVER_IP.value,
              'group.id'          : __class__,
              'auto.offset.reset' : 'latest'}
        )
        kafka_consumer.subscribe([KafkaTopic.VALUE.value])
        LOGGER.debug("Kafka Consumer start listenng on topic: ".format(KafkaTopic.VALUE.value))
        print("Kafka Consumer start listenng on topic: ".format(KafkaTopic.VALUE.value))
        while True:
            raw_kpi = kafka_consumer.poll(1.0)
            if raw_kpi is None:
                continue
            elif raw_kpi.error():
                if raw_kpi.error().code() == KafkaError._PARTITION_EOF:
                    continue
                else:
                    print("Consumer error: {}".format(raw_kpi.error()))
                    continue
            try:
                kpi_value = KpiValue()
                kpi_value.ParseFromString(raw_kpi.value())
                LOGGER.debug("Received KPI : {:}".format(kpi_value))
                print("Received KPI : {:}".format(kpi_value))
                KpiValueWriter.get_kpi_descriptor_from_db(kpi_value.kpi_id.kpi_id.uuid)
            except Exception as e:
                print("Error detail: {:}".format(e))
                continue

    @staticmethod
    def get_kpi_descriptor_from_db(kpi_value_uuid: str):
        print("--- START -----")

        kpi_id = KpiId()
        kpi_id.kpi_id.uuid = kpi_value_uuid
        print("KpiId generated: {:}".format(kpi_id))
        
        kpi_manager_client = KpiManagerClient()
        print("Kpi manger client created: {:}".format(kpi_manager_client))

        try:
            kpi_descriptor_object = KpiDescriptor()
            kpi_descriptor_object = kpi_manager_client.GetKpiDescriptor(kpi_id)

            print("kpi descriptor received: {:}".format(kpi_descriptor_object))
            if isinstance (kpi_descriptor_object, KpiDescriptor):
                LOGGER.debug("Extracted row: {:}".format(kpi_descriptor_object))
            else:
                LOGGER.debug("Error in extracting row {:}".format(kpi_descriptor_object))
        except Exception as e:
            print ("Unable to get Descriptor. Error: {:}".format(e))