# 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 grpc
import os, pytest
import logging
from typing import Union

from common.proto.context_pb2 import  Empty
from common.Constants import 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_manager_pb2 import KpiId, KpiDescriptor, KpiDescriptorFilter, KpiDescriptorList
from common.tools.service.GenericGrpcService import GenericGrpcService

from kpi_manager.tests.test_messages import create_kpi_descriptor_request, create_kpi_filter_request, create_kpi_descriptor_request_a
from kpi_manager.service.KpiManagerService import KpiManagerService
from kpi_manager.client.KpiManagerClient import KpiManagerClient
from kpi_manager.tests.test_messages import create_kpi_descriptor_request
from kpi_manager.tests.test_messages import create_kpi_id_request

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

LOCAL_HOST = '127.0.0.1'

KPIMANAGER_SERVICE_PORT = get_service_port_grpc(ServiceNameEnum.KPIMANAGER)  # type: ignore
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)

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)

# This fixture will be requested by test cases and last during testing session
@pytest.fixture(scope='session')
def kpi_manager_service():
    LOGGER.info('Initializing KpiManagerService...')
    _service = KpiManagerService()
    _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...')

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


###########################
# Tests Implementation of Kpi Manager
###########################

# ---------- 3rd Iteration Tests ----------------
def test_SetKpiDescriptor(kpi_manager_client):
    LOGGER.info(" >>> test_SetKpiDescriptor: START <<< ")
    response = kpi_manager_client.SetKpiDescriptor(create_kpi_descriptor_request())
    LOGGER.info("Response gRPC message object: {:}".format(response))
    assert isinstance(response, KpiId)

def test_DeleteKpiDescriptor(kpi_manager_client):
    LOGGER.info(" >>> test_DeleteKpiDescriptor: START <<< ")
    # adding KPI
    response_id = kpi_manager_client.SetKpiDescriptor(create_kpi_descriptor_request())

    # deleting KPI
    del_response = kpi_manager_client.DeleteKpiDescriptor(response_id)
    LOGGER.info("Response of delete method gRPC message object: {:}".format(del_response))
    assert isinstance(del_response, Empty)

    # select KPI and check it does not exist
    with pytest.raises(grpc.RpcError) as e:
        kpi_manager_client.GetKpiDescriptor(response_id)
    assert e.value.code() == grpc.StatusCode.NOT_FOUND
    MSG = 'KpiDescriptor({:s}) not found'
    assert e.value.details() == MSG.format(response_id.kpi_id.uuid)

def test_GetKpiDescriptor(kpi_manager_client):
    LOGGER.info(" >>> test_GetKpiDescriptor: START <<< ")
    # adding KPI
    response_id = kpi_manager_client.SetKpiDescriptor(create_kpi_descriptor_request())
    # get KPI
    response = kpi_manager_client.GetKpiDescriptor(response_id)
    LOGGER.info("Response gRPC message object: {:}".format(response))
    assert isinstance(response, KpiDescriptor)

def test_SelectKpiDescriptor(kpi_manager_client):
    LOGGER.info(" >>> test_SelectKpiDescriptor: START <<< ")
    # adding KPI
    kpi_manager_client.SetKpiDescriptor(create_kpi_descriptor_request())
    # select KPI(s)    
    response = kpi_manager_client.SelectKpiDescriptor(create_kpi_filter_request())
    LOGGER.info("Response gRPC message object: {:}".format(response))
    assert isinstance(response, KpiDescriptorList)