import logging, grpc
import pytest
from typing import Tuple

from monitoring.proto import context_pb2, kpi_sample_types_pb2
from monitoring.proto import monitoring_pb2
from monitoring.client.monitoring_client import MonitoringClient
from monitoring.Config import GRPC_SERVICE_PORT, GRPC_MAX_WORKERS, GRPC_GRACE_PERIOD
from monitoring.service.MonitoringService import MonitoringService
from monitoring.service.EventTools import EventsDeviceCollector

from common.orm.Database import Database
from common.orm.Factory import get_database_backend, BackendEnum as DatabaseBackendEnum
from common.message_broker.Factory import get_messagebroker_backend, BackendEnum as MessageBrokerBackendEnum
from common.message_broker.MessageBroker import MessageBroker

from context.Config import GRPC_SERVICE_PORT as grpc_port_context, GRPC_MAX_WORKERS as grpc_workers_context, GRPC_GRACE_PERIOD as grpc_grace_context
from context.client.ContextClient import ContextClient
from context.service.grpc_server.ContextService import ContextService
from context.service.Populate import populate
from context.proto.context_pb2 import EventTypeEnum, DeviceEvent, Device
from context.tests.example_objects import (DEVICE1, DEVICE1_UUID)

LOGGER = logging.getLogger(__name__)
LOGGER.setLevel(logging.DEBUG)

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

SERVER_ADDRESS = '127.0.0.1'
LISTEN_ADDRESS = '[::]'
GRPC_PORT_MONITORING = 7070

GRPC_PORT_CONTEXT    = 10000 + grpc_port_context    # avoid privileged ports

SCENARIOS = [ # comment/uncomment scenarios to activate/deactivate them in the test unit
    ('all_inmemory', DatabaseBackendEnum.INMEMORY, {},           MessageBrokerBackendEnum.INMEMORY, {}          ),
]

@pytest.fixture(scope='session', ids=[str(scenario[0]) for scenario in SCENARIOS], params=SCENARIOS)
def context_db_mb(request) -> Tuple[Database, MessageBroker]:
    name,db_backend,db_settings,mb_backend,mb_settings = request.param
    msg = 'Running scenario {:s} db_backend={:s}, db_settings={:s}, mb_backend={:s}, mb_settings={:s}...'
    LOGGER.info(msg.format(str(name), str(db_backend.value), str(db_settings), str(mb_backend.value), str(mb_settings)))
    _database = Database(get_database_backend(backend=db_backend, **db_settings))
    _message_broker = MessageBroker(get_messagebroker_backend(backend=mb_backend, **mb_settings))
    yield _database, _message_broker
    _message_broker.terminate()

@pytest.fixture(scope='session')
def context_service_grpc(context_db_mb : Tuple[Database, MessageBroker]): # pylint: disable=redefined-outer-name
    database = context_db_mb[0]
    database.clear_all()
    _service = ContextService(
        database, context_db_mb[1], port=GRPC_PORT_CONTEXT, max_workers=grpc_workers_context,
        grace_period=grpc_grace_context)
    _service.start()
    yield _service
    _service.stop()

@pytest.fixture(scope='session')
def context_client_grpc(context_service_grpc : ContextService): # pylint: disable=redefined-outer-name
    _client = ContextClient(address='localhost', port=GRPC_PORT_CONTEXT)
    yield _client
    _client.close()


# This fixture will be requested by test cases and last during testing session
@pytest.fixture(scope='session')
def monitoring_service():
    LOGGER.warning('monitoring_service begin')

    service_port    = GRPC_SERVICE_PORT
    max_workers     = GRPC_MAX_WORKERS
    grace_period    = GRPC_GRACE_PERIOD

    LOGGER.info('Initializing MonitoringService...')
    grpc_service = MonitoringService(port=service_port, max_workers=max_workers, grace_period=grace_period)
    server = grpc_service.start()

    # yield the server, when test finishes, execution will resume to stop it
    LOGGER.warning('monitoring_service yielding')
    yield server

    LOGGER.info('Terminating MonitoringService...')
    grpc_service.stop()

# 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.
@pytest.fixture(scope='session')
def monitoring_client(monitoring_service):
    LOGGER.warning('monitoring_client begin')
    client = MonitoringClient(server=SERVER_ADDRESS, port=GRPC_PORT_MONITORING)  # instantiate the client
    LOGGER.warning('monitoring_client returning')
    return client

# This fixture will be requested by test cases and last during testing session.
@pytest.fixture(scope='session')
def kpi():
    LOGGER.warning('test_include_kpi begin')
    # form request
    kpi                     = monitoring_pb2.Kpi()
    kpi.kpi_id.kpi_id.uuid  = 'KPIID0000'
    kpi.kpiDescription      = 'KPI Desc'
    return kpi

@pytest.fixture(scope='session')
def kpi_id():
    LOGGER.warning('test_include_kpi begin')

    # form request
    kpi_id              = monitoring_pb2.KpiId()
    kpi_id.kpi_id.uuid  = str(1)

    return kpi_id

@pytest.fixture(scope='session')
def create_kpi_request():
    LOGGER.warning('test_include_kpi begin')

    create_kpi_request                                  = monitoring_pb2.KpiDescriptor()
    create_kpi_request.kpi_description                  = 'KPI Description Test'
    create_kpi_request.kpi_sample_type                  = kpi_sample_types_pb2.KpiSampleType.PACKETS_TRANSMITTED
    create_kpi_request.device_id.device_uuid.uuid       = 'DEV1'  # pylint: disable=maybe-no-member
    create_kpi_request.service_id.service_uuid.uuid     = "SERV1"
    create_kpi_request.endpoint_id.endpoint_uuid.uuid   = "END1"

    return create_kpi_request

@pytest.fixture(scope='session')
def monitor_kpi_request():
    LOGGER.warning('test_monitor_kpi begin')

    monitor_kpi_request                     = monitoring_pb2.MonitorKpiRequest()
    monitor_kpi_request.kpi_id.kpi_id.uuid  = str(1)
    monitor_kpi_request.sampling_duration_s = 120
    monitor_kpi_request.sampling_interval_s = 5

    return monitor_kpi_request


@pytest.fixture(scope='session')
def include_kpi_request():
    LOGGER.warning('test_include_kpi begin')

    include_kpi_request                     = monitoring_pb2.Kpi()
    include_kpi_request.kpi_id.kpi_id.uuid  = str(1)
    include_kpi_request.timestamp           = "2021-10-12T13:14:42Z"
    include_kpi_request.kpi_value.intVal    = 500

    return include_kpi_request

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

# Test case that makes use of client fixture to test server's CreateKpi method
def test_create_kpi(monitoring_client,create_kpi_request):
    # make call to server
    LOGGER.warning('test_create_kpi requesting')
    response = monitoring_client.CreateKpi(create_kpi_request)
    LOGGER.debug(str(response))
    assert isinstance(response, monitoring_pb2.KpiId)

# Test case that makes use of client fixture to test server's MonitorKpi method
def test_monitor_kpi(monitoring_client,monitor_kpi_request):
    LOGGER.warning('test_monitor_kpi begin')
    response = monitoring_client.MonitorKpi(monitor_kpi_request)
    LOGGER.debug(str(response))
    assert isinstance(response, context_pb2.Empty)


# Test case that makes use of client fixture to test server's IncludeKpi method
def test_include_kpi(monitoring_client,include_kpi_request):
    # make call to server
    LOGGER.warning('test_include_kpi requesting')
    response = monitoring_client.IncludeKpi(include_kpi_request)
    LOGGER.debug(str(response))
    assert isinstance(response, context_pb2.Empty)

# Test case that makes use of client fixture to test server's GetStreamKpi method
def test_get_stream_kpi(monitoring_client,include_kpi_request):
    LOGGER.warning('test_getstream_kpi begin')
    response = monitoring_client.GetStreamKpi(kpi)
    LOGGER.debug(str(response))
    #assert isinstance(response, monitoring_pb2.Kpi)

# Test case that makes use of client fixture to test server's GetInstantKpi method
def test_get_instant_kpi(monitoring_client,kpi_id):
    LOGGER.warning('test_getinstant_kpi begin')
    response = monitoring_client.GetInstantKpi(kpi_id)
    LOGGER.debug(str(response))
    assert isinstance(response, monitoring_pb2.Kpi)

# Test case that makes use of client fixture to test server's GetInstantKpi method
def test_get_kpidescritor_kpi(monitoring_client,kpi_id):
    LOGGER.warning('test_getkpidescritor_kpi begin')
    response = monitoring_client.GetKpiDescriptor(kpi_id)
    LOGGER.debug(str(response))
    assert isinstance(response, monitoring_pb2.KpiDescriptor)

def test_get_device_events(context_client_grpc: ContextClient,  # pylint: disable=redefined-outer-name
    monitoring_client : MonitoringClient,
    context_db_mb: Tuple[Database, MessageBroker]):

    LOGGER.warning('test_getkpidescritor_kpi begin')

    context_database = context_db_mb[0]

    # ----- Clean the database -----------------------------------------------------------------------------------------
    context_database.clear_all()

    # ----- Initialize the EventsCollector -----------------------------------------------------------------------------
    events_collector = EventsDeviceCollector(context_client_grpc,monitoring_client)
    events_collector.start()

    # # ----- Dump state of database before create the object ------------------------------------------------------------
    db_entries = context_database.dump()
    LOGGER.info('----- Database Dump [{:3d} entries] -------------------------'.format(len(db_entries)))
    for db_entry in db_entries:
        LOGGER.info('  [{:>4s}] {:40s} :: {:s}'.format(*db_entry)) # pragma: no cover
    LOGGER.info('-----------------------------------------------------------')
    assert len(db_entries) == 0

    populate('localhost', GRPC_PORT_CONTEXT) # place this call in the appropriate line, according to your tests

    # ----- Check create event -----------------------------------------------------------------------------------------
    event = events_collector.get_event(block=True)

    assert isinstance(event, DeviceEvent)
    assert event.event.event_type == EventTypeEnum.EVENTTYPE_CREATE
    assert event.device_id.device_uuid.uuid == DEVICE1_UUID

    # ----- Update the object ------------------------------------------------------------------------------------------
    response = context_client_grpc.SetDevice(Device(**DEVICE1))
    assert response.device_uuid.uuid == DEVICE1_UUID

    events_collector.stop()

def test_listen_events(monitoring_client: MonitoringClient,
    context_client_grpc: ContextClient,  # pylint: disable=redefined-outer-name
    context_db_mb: Tuple[Database, MessageBroker]):

    LOGGER.warning('test_listen_events begin')

    context_database = context_db_mb[0]

    # ----- Clean the database -----------------------------------------------------------------------------------------
    context_database.clear_all()

    # ----- Initialize the EventsCollector -----------------------------------------------------------------------------
    events_collector = EventsDeviceCollector(context_client_grpc,monitoring_client)
    events_collector.start()

    # # ----- Dump state of database before create the object ------------------------------------------------------------
    db_entries = context_database.dump()
    LOGGER.info('----- Database Dump [{:3d} entries] -------------------------'.format(len(db_entries)))
    for db_entry in db_entries:
        LOGGER.info('  [{:>4s}] {:40s} :: {:s}'.format(*db_entry)) # pragma: no cover
    LOGGER.info('-----------------------------------------------------------')
    assert len(db_entries) == 0

    populate('localhost', GRPC_PORT_CONTEXT) # place this call in the appropriate line, according to your tests

    kpi_id_list = events_collector.listen_events()

    assert bool(kpi_id_list) == True