# 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 os, pytest
import logging, json

from apscheduler.schedulers.background import BackgroundScheduler

from common.proto.context_pb2 import ConfigActionEnum, Context, ContextId, DeviceOperationalStatusEnum, EventTypeEnum, DeviceEvent, Device, Empty, Topology, TopologyId
from common.Constants import ServiceNameEnum
from common.Constants import DEFAULT_CONTEXT_NAME, DEFAULT_TOPOLOGY_NAME, ServiceNameEnum
from common.Settings import (
    ENVVAR_SUFIX_SERVICE_HOST, ENVVAR_SUFIX_SERVICE_PORT_GRPC, get_env_var_name, get_service_port_grpc)
from common.tests.MockServicerImpl_Context import MockServicerImpl_Context
from common.proto.context_pb2_grpc import add_ContextServiceServicer_to_server
from common.proto.kpi_sample_types_pb2 import KpiSampleType
from common.tools.object_factory.Context import json_context, json_context_id
from common.tools.object_factory.Topology import json_topology, json_topology_id
# from common.proto.monitoring_pb2 import KpiId, KpiDescriptor, SubsDescriptor, SubsList, AlarmID, \
#     AlarmDescriptor, AlarmList, KpiDescriptorList, SubsResponse, AlarmResponse, RawKpiTable #, Kpi, KpiList
from common.proto.kpi_manager_pb2 import KpiId, KpiDescriptor, KpiDescriptorList


from device.service.driver_api.DriverFactory import DriverFactory
from device.service.driver_api.DriverInstanceCache import DriverInstanceCache
from device.service.DeviceService import DeviceService
from device.client.DeviceClient import DeviceClient

from kpi_manager.tests.test_messages import create_kpi_request, create_kpi_request_b, create_kpi_request_c, create_kpi_request_d
# from monitoring.service.MonitoringService import MonitoringService
from kpi_manager.service.KpiManagerService import KpiManagerService
# from monitoring.client.MonitoringClient import MonitoringClient
from kpi_manager.client.KpiManagerClient import KpiManagerClient

from monitoring.service.ManagementDBTools import ManagementDB
from monitoring.service.MetricsDBTools import MetricsDB
from monitoring.service.NameMapping import NameMapping

###########################
# Tests Setup
###########################

LOCAL_HOST = '127.0.0.1'
MOCKSERVICE_PORT = 10000

KPIMANAGER_SERVICE_PORT = MOCKSERVICE_PORT + get_service_port_grpc(ServiceNameEnum.KPIMANAGER) # avoid privileged ports
os.environ[get_env_var_name(ServiceNameEnum.KPIMANAGER, ENVVAR_SUFIX_SERVICE_HOST     )] = str(LOCAL_HOST)
os.environ[get_env_var_name(ServiceNameEnum.KPIMANAGER, ENVVAR_SUFIX_SERVICE_PORT_GRPC)] = str(KPIMANAGER_SERVICE_PORT)

METRICSDB_HOSTNAME = os.environ.get('METRICSDB_HOSTNAME')

LOGGER = logging.getLogger(__name__)

class MockContextService(GenericGrpcService):
    # Mock Service implementing Context to simplify unitary tests of Monitoring

    def __init__(self, bind_port: Union[str, int]) -> None:
        super().__init__(bind_port, LOCAL_HOST, enable_health_servicer=False, cls_name='MockService')

    # pylint: disable=attribute-defined-outside-init
    def install_servicers(self):
        self.context_servicer = MockServicerImpl_Context()
        add_ContextServiceServicer_to_server(self.context_servicer, self.server)

@pytest.fixture(scope='session')
def context_service():
    LOGGER.info('Initializing MockContextService...')
    _service = MockContextService(MOCKSERVICE_PORT)
    _service.start()
    
    LOGGER.info('Yielding MockContextService...')
    yield _service

    LOGGER.info('Terminating MockContextService...')
    _service.context_servicer.msg_broker.terminate()
    _service.stop()

    LOGGER.info('Terminated MockContextService...')

@pytest.fixture(scope='session')
def context_client(context_service : MockContextService): # pylint: disable=redefined-outer-name,unused-argument
    LOGGER.info('Initializing ContextClient...')
    _client = ContextClient()
    
    LOGGER.info('Yielding ContextClient...')
    yield _client

    LOGGER.info('Closing ContextClient...')
    _client.close()

    LOGGER.info('Closed ContextClient...')

@pytest.fixture(scope='session')
def device_service(context_service : MockContextService): # pylint: disable=redefined-outer-name,unused-argument
    LOGGER.info('Initializing DeviceService...')
    driver_factory = DriverFactory(DRIVERS)
    driver_instance_cache = DriverInstanceCache(driver_factory)
    _service = DeviceService(driver_instance_cache)
    _service.start()

    # yield the server, when test finishes, execution will resume to stop it
    LOGGER.info('Yielding DeviceService...')
    yield _service

    LOGGER.info('Terminating DeviceService...')
    _service.stop()

    LOGGER.info('Terminated DeviceService...')

@pytest.fixture(scope='session')
def device_client(device_service : DeviceService): # pylint: disable=redefined-outer-name,unused-argument
    LOGGER.info('Initializing DeviceClient...')
    _client = DeviceClient()

    LOGGER.info('Yielding DeviceClient...')
    yield _client

    LOGGER.info('Closing DeviceClient...')
    _client.close()

    LOGGER.info('Closed DeviceClient...')

@pytest.fixture(scope='session')
def device_client(device_service : DeviceService): # pylint: disable=redefined-outer-name,unused-argument
    LOGGER.info('Initializing DeviceClient...')
    _client = DeviceClient()

    LOGGER.info('Yielding DeviceClient...')
    yield _client

    LOGGER.info('Closing DeviceClient...')
    _client.close()

    LOGGER.info('Closed DeviceClient...')

# This fixture will be requested by test cases and last during testing session
@pytest.fixture(scope='session')
def kpi_manager_service(
        context_service : MockContextService,  # pylint: disable=redefined-outer-name,unused-argument
        device_service : DeviceService     # pylint: disable=redefined-outer-name,unused-argument
    ):
    LOGGER.info('Initializing KpiManagerService...')
    name_mapping = NameMapping()
    # _service = MonitoringService(name_mapping)
    _service = KpiManagerService(name_mapping)
    _service.start()

    # yield the server, when test finishes, execution will resume to stop it
    LOGGER.info('Yielding KpiManagerService...')
    yield _service

    LOGGER.info('Terminating KpiManagerService...')
    _service.stop()

    LOGGER.info('Terminated KpiManagerService...')

# This fixture will be requested by test cases and last during testing session.
# The client requires the server, so client fixture has the server as dependency.
# def monitoring_client(monitoring_service : MonitoringService): (Add for better understanding)
@pytest.fixture(scope='session')
def kpi_manager_client(kpi_manager_service : KpiManagerService): # pylint: disable=redefined-outer-name,unused-argument
    LOGGER.info('Initializing KpiManagerClient...')
    _client = KpiManagerClient()

    # yield the server, when test finishes, execution will resume to stop it
    LOGGER.info('Yielding KpiManagerClient...')
    yield _client

    LOGGER.info('Closing KpiManagerClient...')
    _client.close()

    LOGGER.info('Closed KpiManagerClient...')

@pytest.fixture(scope='session')
def management_db():
    _management_db = ManagementDB('monitoring.db')
    return _management_db

@pytest.fixture(scope='session')
def metrics_db(kpi_manager_service : KpiManagerService): # pylint: disable=redefined-outer-name
    return monitoring_service.monitoring_servicer.metrics_db

# This function os not clear to me (Changes should me made before execution)
@pytest.fixture(scope='session')
def metrics_db(monitoring_service : MonitoringService): # pylint: disable=redefined-outer-name
    return monitoring_service.monitoring_servicer.metrics_db
    #_metrics_db = MetricsDBTools.MetricsDB(
    #    METRICSDB_HOSTNAME, METRICSDB_ILP_PORT, METRICSDB_REST_PORT, METRICSDB_TABLE_MONITORING_KPIS)
    #return _metrics_db

@pytest.fixture(scope='session')
def subs_scheduler():
    _scheduler = BackgroundScheduler(executors={'processpool': ProcessPoolExecutor(max_workers=20)})
    _scheduler.start()
    return _scheduler

def ingestion_data(kpi_id_int):
    # pylint: disable=redefined-outer-name,unused-argument
    metrics_db = MetricsDB('localhost', '9009', '9000', 'monitoring')

    kpiSampleType = KpiSampleType.KPISAMPLETYPE_PACKETS_RECEIVED
    kpiSampleType_name = KpiSampleType.Name(kpiSampleType).upper().replace('KPISAMPLETYPE_', '')
    for _ in range(50):
        kpiSampleType   = kpiSampleType_name
        kpiId           = kpi_id_int
        deviceId        = 'DEV'+ str(kpi_id_int)
        endpointId      = 'END' + str(kpi_id_int)
        serviceId       = 'SERV' + str(kpi_id_int)
        sliceId         = 'SLC' + str(kpi_id_int)
        connectionId    = 'CON' + str(kpi_id_int)
        time_stamp      = timestamp_utcnow_to_float()
        kpi_value       = 500*random()

        metrics_db.write_KPI(time_stamp, kpiId, kpiSampleType, deviceId, endpointId, serviceId, sliceId, connectionId,
                                  kpi_value)
        sleep(0.1)

##################################################
# Prepare Environment, should be the first test
##################################################

def test_prepare_environment(
    context_client : ContextClient,                 # pylint: disable=redefined-outer-name,unused-argument
):
    context_id = json_context_id(DEFAULT_CONTEXT_NAME)
    context_client.SetContext(Context(**json_context(DEFAULT_CONTEXT_NAME)))
    context_client.SetTopology(Topology(**json_topology(DEFAULT_TOPOLOGY_NAME, context_id=context_id)))

###########################
# Tests Implementation
###########################

# Test case that makes use of client fixture to test server's CreateKpi method
def test_set_kpi(kpi_manager_client): # pylint: disable=redefined-outer-name
    # make call to server
    LOGGER.warning('test_create_kpi requesting')
    for i in range(3):
        response = kpi_manager_client.SetKpi(create_kpi_request(str(i+1)))
        LOGGER.debug(str(response))
        assert isinstance(response, KpiId)

# Test case that makes use of client fixture to test server's DeleteKpi method
def test_delete_kpi(kpi_manager_client): # pylint: disable=redefined-outer-name
    # make call to server
    LOGGER.warning('delete_kpi requesting')
    response = kpi_manager_client.SetKpi(create_kpi_request('4'))
    response = kpi_manager_client.DeleteKpi(response)
    LOGGER.debug(str(response))
    assert isinstance(response, Empty)

# Test case that makes use of client fixture to test server's GetKpiDescriptor method
def test_get_kpi_descriptor_list(kpi_manager_client): # pylint: disable=redefined-outer-name
    LOGGER.warning('test_getkpidescritor_kpi begin')
    response = kpi_manager_client.GetKpiDescriptorList(Empty())
    LOGGER.debug(str(response))
    assert isinstance(response, KpiDescriptorList)
