# Copyright 2022-2025 ETSI 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 logging, grpc
from common.method_wrappers.Decorator import MetricsPool, safe_and_metered_rpc_method
from common.proto.context_pb2 import Empty
from common.proto.kpi_manager_pb2_grpc import KpiManagerServiceServicer
from common.proto.kpi_manager_pb2 import KpiId, KpiDescriptor, KpiDescriptorFilter, KpiDescriptorList
from common.method_wrappers.ServiceExceptions import NotFoundException
from kpi_manager.database.KpiDB import KpiDB
from kpi_manager.database.KpiModel import Kpi as KpiModel

LOGGER = logging.getLogger(__name__)
METRICS_POOL = MetricsPool('KpiManager', 'NBIgRPC')

class KpiManagerServiceServicerImpl(KpiManagerServiceServicer):
    def __init__(self):
        LOGGER.info('Init KpiManagerService')
        self.kpi_db_obj = KpiDB(KpiModel)
    
    @safe_and_metered_rpc_method(METRICS_POOL, LOGGER)
    def SetKpiDescriptor(
        self, request: KpiDescriptor, grpc_context: grpc.ServicerContext # type: ignore
    ) -> KpiId: # type: ignore
        response = KpiId()
        LOGGER.info("Received gRPC message object: {:}".format(request))
        kpi_to_insert = KpiModel.convert_KpiDescriptor_to_row(request)
        if self.kpi_db_obj.add_row_to_db(kpi_to_insert):
            response.kpi_id.uuid = request.kpi_id.kpi_id.uuid
            # LOGGER.info("Added Row: {:}".format(response))
        return response

    @safe_and_metered_rpc_method(METRICS_POOL, LOGGER)        
    def GetKpiDescriptor(
        self, request: KpiId, grpc_context: grpc.ServicerContext # type: ignore
    ) -> KpiDescriptor: # type: ignore
        response = KpiDescriptor()
        LOGGER.info("Received gRPC message object: {:}".format(request))
        kpi_id_to_search = request.kpi_id.uuid
        row = self.kpi_db_obj.search_db_row_by_id(KpiModel, 'kpi_id', kpi_id_to_search)
        if row is None:
            LOGGER.info('No matching row found kpi id: {:}'.format(kpi_id_to_search))
            raise NotFoundException('KpiDescriptor', kpi_id_to_search)
        response = KpiModel.convert_row_to_KpiDescriptor(row)
        return response
    
    @safe_and_metered_rpc_method(METRICS_POOL, LOGGER)
    def DeleteKpiDescriptor(
        self, request: KpiId, grpc_context: grpc.ServicerContext # type: ignore
    ) -> Empty: # type: ignore
        LOGGER.info("Received gRPC message object: {:}".format(request))
        kpi_id_to_search = request.kpi_id.uuid
        self.kpi_db_obj.delete_db_row_by_id(KpiModel, 'kpi_id', kpi_id_to_search)
        return Empty()

    @safe_and_metered_rpc_method(METRICS_POOL, LOGGER)
    def SelectKpiDescriptor(
        self, filter: KpiDescriptorFilter, grpc_context: grpc.ServicerContext # type: ignore
    ) -> KpiDescriptorList: # type: ignore
        LOGGER.info("Received gRPC message object: {:}".format(filter))
        response = KpiDescriptorList()
        rows = self.kpi_db_obj.select_with_filter(KpiModel, filter)
        for row in rows:
            kpiDescriptor_obj = KpiModel.convert_row_to_KpiDescriptor(row)
            response.kpi_descriptor_list.append(kpiDescriptor_obj)
        return response