# 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 os, grpc, logging
from prometheus_client import Counter, Summary
from monitoring.proto.kpi_sample_types_pb2 import KpiSampleType
from monitoring.service import SqliteTools, InfluxTools
from monitoring.proto import monitoring_pb2
from monitoring.proto import monitoring_pb2_grpc
from common.rpc_method_wrapper.ServiceExceptions import ServiceException
from context.proto import context_pb2
from device.client.DeviceClient import DeviceClient
from device.proto import device_pb2

LOGGER = logging.getLogger(__name__)

MONITORING_GETINSTANTKPI_REQUEST_TIME = Summary(
    'monitoring_getinstantkpi_processing_seconds', 'Time spent processing monitoring instant kpi request')
MONITORING_INCLUDEKPI_COUNTER = Counter('monitoring_includekpi_counter', 'Monitoring include kpi request counter')

INFLUXDB_HOSTNAME = os.environ.get("INFLUXDB_HOSTNAME")
INFLUXDB_USER = os.environ.get("INFLUXDB_USER")
INFLUXDB_PASSWORD = os.environ.get("INFLUXDB_PASSWORD")
INFLUXDB_DATABASE = os.environ.get("INFLUXDB_DATABASE")


class MonitoringServiceServicerImpl(monitoring_pb2_grpc.MonitoringServiceServicer):
    def __init__(self):
        LOGGER.info('Init monitoringService')

        # Init sqlite monitoring db
        self.sql_db = SqliteTools.SQLite('monitoring.db')

        # Create influx_db client
        self.influx_db = InfluxTools.Influx(INFLUXDB_HOSTNAME,"8086",INFLUXDB_USER,INFLUXDB_PASSWORD,INFLUXDB_DATABASE)

    # CreateKpi (CreateKpiRequest) returns (KpiId) {}
    def CreateKpi(
        self, request : monitoring_pb2.KpiDescriptor, grpc_context : grpc.ServicerContext
    ) -> monitoring_pb2.KpiId:
        # CREATEKPI_COUNTER_STARTED.inc()
        LOGGER.info('CreateKpi')
        try:
            # Here the code to create a sqlite query to crete a KPI and return a KpiID
            kpi_id = monitoring_pb2.KpiId()

            kpi_description = request.kpi_description
            kpi_sample_type = request.kpi_sample_type
            kpi_device_id   = request.device_id.device_uuid.uuid
            kpi_endpoint_id = request.endpoint_id.endpoint_uuid.uuid
            kpi_service_id  = request.service_id.service_uuid.uuid

            data = self.sql_db.insert_KPI(
                kpi_description, kpi_sample_type, kpi_device_id, kpi_endpoint_id, kpi_service_id)

            kpi_id.kpi_id.uuid = str(data)

            # CREATEKPI_COUNTER_COMPLETED.inc()
            return kpi_id
        except ServiceException as e:
            LOGGER.exception('CreateKpi exception')
            # CREATEKPI_COUNTER_FAILED.inc()
            grpc_context.abort(e.code, e.details)
        except Exception as e:  # pragma: no cover
            LOGGER.exception('CreateKpi exception')
            # CREATEKPI_COUNTER_FAILED.inc()
            grpc_context.abort(grpc.StatusCode.INTERNAL, str(e))

    # rpc MonitorKpi (MonitorKpiRequest) returns (context.Empty) {}
    def MonitorKpi(
        self, request : monitoring_pb2.MonitorKpiRequest, grpc_context : grpc.ServicerContext
    ) -> context_pb2.Empty:

        LOGGER.info('MonitorKpi')
        try:
            # Creates the request to send to the device service
            monitor_device_request = device_pb2.MonitoringSettings()

            kpiDescriptor = self.GetKpiDescriptor(request.kpi_id, grpc_context)

            monitor_device_request.kpi_descriptor.CopyFrom(kpiDescriptor)
            monitor_device_request.kpi_id.kpi_id.uuid  = request.kpi_id.kpi_id.uuid
            monitor_device_request.sampling_duration_s = request.sampling_duration_s
            monitor_device_request.sampling_interval_s = request.sampling_interval_s

            device_client = DeviceClient()
            device_client.MonitorDeviceKpi(monitor_device_request)

        except ServiceException as e:
            LOGGER.exception('MonitorKpi exception')
            # CREATEKPI_COUNTER_FAILED.inc()
            grpc_context.abort(e.code, e.details)
        except Exception as e:  # pragma: no cover
            LOGGER.exception('MonitorKpi exception')
            grpc_context.abort(grpc.StatusCode.INTERNAL, str(e))
            # CREATEKPI_COUNTER_FAILED.inc()

        return context_pb2.Empty()

    # rpc IncludeKpi(IncludeKpiRequest)  returns(context.Empty)    {}
    def IncludeKpi(self, request : monitoring_pb2.Kpi, grpc_context : grpc.ServicerContext) -> context_pb2.Empty:

        LOGGER.info('IncludeKpi')

        try:
            kpiDescriptor = self.GetKpiDescriptor(request.kpi_id, grpc_context)
            if kpiDescriptor is None:
                LOGGER.warning('Ignoring sample with KPIId({:s}): not found in database'.format(str(request.kpi_id)))
                return context_pb2.Empty()

            kpiSampleType   = KpiSampleType.Name(kpiDescriptor.kpi_sample_type).upper().replace('KPISAMPLETYPE_', '')
            kpiId           = request.kpi_id.kpi_id.uuid
            deviceId        = kpiDescriptor.device_id.device_uuid.uuid
            endpointId      = kpiDescriptor.endpoint_id.endpoint_uuid.uuid
            serviceId       = kpiDescriptor.service_id.service_uuid.uuid
            time_stamp      = request.timestamp
            kpi_value       = getattr(request.kpi_value, request.kpi_value.WhichOneof('value'))

            # Build the structure to be included as point in the influxDB
            self.influx_db.write_KPI(time_stamp,kpiId,kpiSampleType,deviceId,endpointId,serviceId,kpi_value)

            #self.influx_db.read_KPI_points()

        except ServiceException as e:
            LOGGER.exception('IncludeKpi exception')
            # CREATEKPI_COUNTER_FAILED.inc()
            grpc_context.abort(e.code, e.details)
        except Exception:  # pragma: no cover
            LOGGER.exception('IncludeKpi exception')
            # CREATEKPI_COUNTER_FAILED.inc()
        return context_pb2.Empty()

    def GetStreamKpi ( self, request, grpc_context : grpc.ServicerContext):
        # receives monitoring.KpiId returns stream monitoring.Kpi
        LOGGER.info('GetStreamKpi')
        yield monitoring_pb2.Kpi()

    @MONITORING_GETINSTANTKPI_REQUEST_TIME.time()
    def GetInstantKpi ( self, request, grpc_context : grpc.ServicerContext):
        # receives monitoring.KpiId returns monitoring.Kpi
        LOGGER.info('GetInstantKpi')
        return monitoring_pb2.Kpi()


    def GetKpiDescriptor(
        self, request : monitoring_pb2.KpiId, grpc_context : grpc.ServicerContext
    ) -> monitoring_pb2.KpiDescriptor:
        LOGGER.info('getting Kpi by KpiID')
        try:
            kpi_db = self.sql_db.get_KPI(int(request.kpi_id.uuid))
            #LOGGER.info('sql_db.get_KPIS={:s}'.format(str(self.sql_db.get_KPIS())))
            #LOGGER.info('kpi_db={:s}'.format(str(kpi_db)))
            if kpi_db is None: return None

            kpiDescriptor = monitoring_pb2.KpiDescriptor()

            kpiDescriptor.kpi_description                   = kpi_db[1]
            kpiDescriptor.kpi_sample_type                   = kpi_db[2]
            kpiDescriptor.device_id.device_uuid.uuid        = str(kpi_db[3])
            kpiDescriptor.endpoint_id.endpoint_uuid.uuid    = str(kpi_db[4])
            kpiDescriptor.service_id.service_uuid.uuid      = str(kpi_db[5])

            return kpiDescriptor
        except ServiceException as e:
            LOGGER.exception('GetKpiDescriptor exception')
            grpc_context.abort(e.code, e.details)

        except Exception:  # pragma: no cover
            LOGGER.exception('GetKpiDescriptor exception')
