import copy, grpc, logging, operator, os, pytest
from typing import Any, Dict, List, Tuple
from google.protobuf.json_format import MessageToDict
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 CONTEXT_GRPC_SERVICE_PORT, GRPC_MAX_WORKERS as CONTEXT_GRPC_MAX_WORKERS,
    GRPC_GRACE_PERIOD as CONTEXT_GRPC_GRACE_PERIOD)
from context.client.ContextClient import ContextClient
from context.proto.context_pb2 import DeviceId
from context.service.grpc_server.ContextService import ContextService
from device.Config import (
    GRPC_SERVICE_PORT as DEVICE_GRPC_SERVICE_PORT, GRPC_MAX_WORKERS as DEVICE_GRPC_MAX_WORKERS,
    GRPC_GRACE_PERIOD as DEVICE_GRPC_GRACE_PERIOD)
from device.client.DeviceClient import DeviceClient
from device.proto.context_pb2 import ConfigActionEnum, Context, Device, Topology
from device.service.DeviceService import DeviceService
from device.service.MonitoringLoops import MonitoringLoops
from device.service.driver_api._Driver import _Driver
from device.service.driver_api.DriverFactory import DriverFactory
from device.service.driver_api.DriverInstanceCache import DriverInstanceCache
from device.service.drivers import DRIVERS
from monitoring.client.monitoring_client import MonitoringClient
from .example_objects import (
    CONTEXT, TOPOLOGY, config_rule,
    DEVICE_EMU, DEVICE_EMU_CONFIG_RULES, DEVICE_EMU_CONNECT_RULES, DEVICE_EMU_ID, DEVICE_EMU_UUID,
    DEVICE_INF, DEVICE_INF_CONFIG_RULES, DEVICE_INF_CONNECT_RULES, DEVICE_INF_ID, DEVICE_INF_UUID)

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

CONTEXT_GRPC_SERVICE_PORT = 10000 + CONTEXT_GRPC_SERVICE_PORT # avoid privileged ports
DEVICE_GRPC_SERVICE_PORT = 10000 + DEVICE_GRPC_SERVICE_PORT # avoid privileged ports

DEFAULT_REDIS_SERVICE_HOST = '127.0.0.1'
DEFAULT_REDIS_SERVICE_PORT = 6379
DEFAULT_REDIS_DATABASE_ID  = 0

REDIS_CONFIG = {
    'REDIS_SERVICE_HOST': os.environ.get('REDIS_SERVICE_HOST', DEFAULT_REDIS_SERVICE_HOST),
    'REDIS_SERVICE_PORT': os.environ.get('REDIS_SERVICE_PORT', DEFAULT_REDIS_SERVICE_PORT),
    'REDIS_DATABASE_ID' : os.environ.get('REDIS_DATABASE_ID',  DEFAULT_REDIS_DATABASE_ID ),
}

SCENARIOS = [
    ('all_inmemory', DatabaseBackendEnum.INMEMORY, {},           MessageBrokerBackendEnum.INMEMORY, {}          ),
    #('all_redis',    DatabaseBackendEnum.REDIS,    REDIS_CONFIG, MessageBrokerBackendEnum.REDIS,    REDIS_CONFIG),
]

@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(context_db_mb : Tuple[Database, MessageBroker]): # pylint: disable=redefined-outer-name
    _service = ContextService(
        context_db_mb[0], context_db_mb[1], port=CONTEXT_GRPC_SERVICE_PORT, max_workers=CONTEXT_GRPC_MAX_WORKERS,
        grace_period=CONTEXT_GRPC_GRACE_PERIOD)
    _service.start()
    yield _service
    _service.stop()

@pytest.fixture(scope='session')
def context_client(context_service : ContextService): # pylint: disable=redefined-outer-name
    _client = ContextClient(address='127.0.0.1', port=CONTEXT_GRPC_SERVICE_PORT)
    yield _client
    _client.close()

@pytest.fixture(scope='session')
def device_service(context_client : ContextClient):  # pylint: disable=redefined-outer-name
    _driver_factory = DriverFactory(DRIVERS)
    _driver_instance_cache = DriverInstanceCache(_driver_factory)
    _monitoring_loops = MonitoringLoops(None) # TODO: replace by monitoring client
    _monitoring_loops.start()
    _service = DeviceService(
        context_client, _driver_instance_cache, _monitoring_loops, port=DEVICE_GRPC_SERVICE_PORT,
        max_workers=DEVICE_GRPC_MAX_WORKERS, grace_period=DEVICE_GRPC_GRACE_PERIOD)
    _service.start()
    yield _service
    _monitoring_loops.stop()
    _service.stop()

@pytest.fixture(scope='session')
def device_client(device_service : DeviceService): # pylint: disable=redefined-outer-name
    _client = DeviceClient(address='127.0.0.1', port=DEVICE_GRPC_SERVICE_PORT)
    yield _client
    _client.close()

def grpc_message_to_json_string(message):
    return str(MessageToDict(
        message, including_default_value_fields=True, preserving_proto_field_name=True, use_integers_for_enums=False))


def test_prepare_environment(
    context_client : ContextClient,     # pylint: disable=redefined-outer-name
    device_client : DeviceClient,       # pylint: disable=redefined-outer-name
    device_service : DeviceService):    # pylint: disable=redefined-outer-name

    context_client.SetContext(Context(**CONTEXT))
    context_client.SetTopology(Topology(**TOPOLOGY))


def test_device_add_emulated_error_cases(
    context_client : ContextClient,     # pylint: disable=redefined-outer-name
    device_client : DeviceClient,       # pylint: disable=redefined-outer-name
    device_service : DeviceService):    # pylint: disable=redefined-outer-name

    with pytest.raises(grpc.RpcError) as e:
        DEVICE_EMU_WITH_EXTRA_RULES = copy.deepcopy(DEVICE_EMU)
        DEVICE_EMU_WITH_EXTRA_RULES['device_config']['config_rules'].extend(DEVICE_EMU_CONNECT_RULES)
        DEVICE_EMU_WITH_EXTRA_RULES['device_config']['config_rules'].extend(DEVICE_EMU_CONFIG_RULES)
        device_client.AddDevice(Device(**DEVICE_EMU_WITH_EXTRA_RULES))
    assert e.value.code() == grpc.StatusCode.INVALID_ARGUMENT
    msg_head = 'device.device_config.config_rules(['
    msg_tail = ']) is invalid; RPC method AddDevice only accepts connection Config Rules that should start '\
               'with "_connect/" tag. Others should be configured after adding the device.'
    except_msg = str(e.value.details())
    assert except_msg.startswith(msg_head) and except_msg.endswith(msg_tail)


def test_device_add_emulated_correct(
    context_client : ContextClient,     # pylint: disable=redefined-outer-name
    device_client : DeviceClient,       # pylint: disable=redefined-outer-name
    device_service : DeviceService):    # pylint: disable=redefined-outer-name

    DEVICE_EMU_WITH_CONNECT_RULES = copy.deepcopy(DEVICE_EMU)
    DEVICE_EMU_WITH_CONNECT_RULES['device_config']['config_rules'].extend(DEVICE_EMU_CONNECT_RULES)
    device_client.AddDevice(Device(**DEVICE_EMU_WITH_CONNECT_RULES))
    driver : _Driver = device_service.driver_instance_cache.get(DEVICE_EMU_UUID) # we know the driver exists now
    assert driver is not None


def test_device_get_emulated(
    context_client : ContextClient,     # pylint: disable=redefined-outer-name
    device_client : DeviceClient,       # pylint: disable=redefined-outer-name
    device_service : DeviceService):    # pylint: disable=redefined-outer-name

    initial_config = device_client.GetInitialConfig(DeviceId(**DEVICE_EMU_ID))
    LOGGER.info('initial_config = {:s}'.format(grpc_message_to_json_string(initial_config)))

    device_data = context_client.GetDevice(DeviceId(**DEVICE_EMU_ID))
    LOGGER.info('device_data = {:s}'.format(grpc_message_to_json_string(device_data)))


def test_device_configure_emulated(
    context_client : ContextClient,     # pylint: disable=redefined-outer-name
    device_client : DeviceClient,       # pylint: disable=redefined-outer-name
    device_service : DeviceService):    # pylint: disable=redefined-outer-name

    driver : _Driver = device_service.driver_instance_cache.get(DEVICE_EMU_UUID) # we know the driver exists now
    assert driver is not None

    driver_config = driver.GetConfig()
    LOGGER.info('driver_config = {:s}'.format(str(driver_config)))
    assert len(driver_config) == 0

    DEVICE_EMU_WITH_CONFIG_RULES = copy.deepcopy(DEVICE_EMU)
    DEVICE_EMU_WITH_CONFIG_RULES['device_config']['config_rules'].extend(DEVICE_EMU_CONFIG_RULES)
    device_client.ConfigureDevice(Device(**DEVICE_EMU_WITH_CONFIG_RULES))

    driver_config = sorted(driver.GetConfig(), key=operator.itemgetter(0))
    LOGGER.info('driver_config = {:s}'.format(str(driver_config)))
    assert len(driver_config) == 3
    assert driver_config[0] == ('/dev/rsrc1/value', 'value1')
    assert driver_config[1] == ('/dev/rsrc2/value', 'value2')
    assert driver_config[2] == ('/dev/rsrc3/value', 'value3')

    DEVICE_EMU_WITH_CONFIG_RULES_2 = copy.deepcopy(DEVICE_EMU)
    DEVICE_EMU_WITH_CONFIG_RULES_2['device_config']['config_rules'].extend([
        config_rule(ConfigActionEnum.CONFIGACTION_DELETE, 'dev/rsrc1/value', ''),
        config_rule(ConfigActionEnum.CONFIGACTION_SET, 'dev/rsrc10/value', 'value10'),
        config_rule(ConfigActionEnum.CONFIGACTION_SET, 'dev/rsrc11/value', 'value11'),
        config_rule(ConfigActionEnum.CONFIGACTION_SET, 'dev/rsrc12/value', 'value12'),
    ])
    device_client.ConfigureDevice(Device(**DEVICE_EMU_WITH_CONFIG_RULES_2))

    driver_config = sorted(driver.GetConfig(), key=operator.itemgetter(0))
    LOGGER.info('driver_config = {:s}'.format(str(driver_config)))
    assert len(driver_config) == 5
    assert driver_config[0] == ('/dev/rsrc10/value', 'value10')
    assert driver_config[1] == ('/dev/rsrc11/value', 'value11')
    assert driver_config[2] == ('/dev/rsrc12/value', 'value12')
    assert driver_config[3] == ('/dev/rsrc2/value', 'value2')
    assert driver_config[4] == ('/dev/rsrc3/value', 'value3')

    device_data = context_client.GetDevice(DeviceId(**DEVICE_EMU_ID))
    LOGGER.info('device_data.device_config.config_rules = \n{:s}'.format(
        '\n'.join([
            '{:s} {:s} = {:s}'.format(
                ConfigActionEnum.Name(config_rule.action), config_rule.resource_key, config_rule.resource_value)
            for config_rule in device_data.device_config.config_rules
        ])))


def test_device_delete_emulated(
    context_client : ContextClient,     # pylint: disable=redefined-outer-name
    device_client : DeviceClient,       # pylint: disable=redefined-outer-name
    device_service : DeviceService):    # pylint: disable=redefined-outer-name

    device_client.DeleteDevice(DeviceId(**DEVICE_EMU_ID))
    driver : _Driver = device_service.driver_instance_cache.get(DEVICE_EMU_UUID, {})
    assert driver is None


def test_device_add_openconfig_error_cases(
    context_client : ContextClient,     # pylint: disable=redefined-outer-name
    device_client : DeviceClient,       # pylint: disable=redefined-outer-name
    device_service : DeviceService):    # pylint: disable=redefined-outer-name

    with pytest.raises(grpc.RpcError) as e:
        DEVICE_INF_WITH_EXTRA_RULES = copy.deepcopy(DEVICE_INF)
        DEVICE_INF_WITH_EXTRA_RULES['device_config']['config_rules'].extend(DEVICE_INF_CONNECT_RULES)
        DEVICE_INF_WITH_EXTRA_RULES['device_config']['config_rules'].extend(DEVICE_INF_CONFIG_RULES)
        device_client.AddDevice(Device(**DEVICE_INF_WITH_EXTRA_RULES))
    assert e.value.code() == grpc.StatusCode.INVALID_ARGUMENT
    msg_head = 'device.device_config.config_rules(['
    msg_tail = ']) is invalid; RPC method AddDevice only accepts connection Config Rules that should start '\
               'with "_connect/" tag. Others should be configured after adding the device.'
    except_msg = str(e.value.details())
    assert except_msg.startswith(msg_head) and except_msg.endswith(msg_tail)


def test_device_add_openconfig_correct(
    context_client : ContextClient,     # pylint: disable=redefined-outer-name
    device_client : DeviceClient,       # pylint: disable=redefined-outer-name
    device_service : DeviceService):    # pylint: disable=redefined-outer-name

    DEVICE_INF_WITH_CONNECT_RULES = copy.deepcopy(DEVICE_INF)
    DEVICE_INF_WITH_CONNECT_RULES['device_config']['config_rules'].extend(DEVICE_INF_CONNECT_RULES)
    device_client.AddDevice(Device(**DEVICE_INF_WITH_CONNECT_RULES))
    driver : _Driver = device_service.driver_instance_cache.get(DEVICE_INF_UUID) # we know the driver exists now
    assert driver is not None


def test_device_get_openconfig(
    context_client : ContextClient,     # pylint: disable=redefined-outer-name
    device_client : DeviceClient,       # pylint: disable=redefined-outer-name
    device_service : DeviceService):    # pylint: disable=redefined-outer-name

    initial_config = device_client.GetInitialConfig(DeviceId(**DEVICE_INF_ID))
    LOGGER.info('initial_config = {:s}'.format(grpc_message_to_json_string(initial_config)))

    device_data = context_client.GetDevice(DeviceId(**DEVICE_INF_ID))
    LOGGER.info('device_data = {:s}'.format(grpc_message_to_json_string(device_data)))


def test_device_configure_openconfig(
    context_client : ContextClient,     # pylint: disable=redefined-outer-name
    device_client : DeviceClient,       # pylint: disable=redefined-outer-name
    device_service : DeviceService):    # pylint: disable=redefined-outer-name

    driver : _Driver = device_service.driver_instance_cache.get(DEVICE_INF_UUID) # we know the driver exists now
    assert driver is not None

    raise NotImplementedError()

    #driver_config = driver.GetConfig()
    #LOGGER.info('driver_config = {:s}'.format(str(driver_config)))
    #assert len(driver_config) == 0

    #DEVICE_INF_WITH_CONFIG_RULES = copy.deepcopy(DEVICE_INF)
    #DEVICE_INF_WITH_CONFIG_RULES['device_config']['config_rules'].extend(DEVICE_INF_CONFIG_RULES)
    #device_client.ConfigureDevice(Device(**DEVICE_INF_WITH_CONFIG_RULES))

    #driver_config = sorted(driver.GetConfig(), key=operator.itemgetter(0))
    #LOGGER.info('driver_config = {:s}'.format(str(driver_config)))
    #assert len(driver_config) == 5
    #assert driver_config[0] == ('/dev/rsrc10/value', 'value10')
    #assert driver_config[1] == ('/dev/rsrc11/value', 'value11')
    #assert driver_config[2] == ('/dev/rsrc12/value', 'value12')
    #assert driver_config[3] == ('/dev/rsrc2/value', 'value2')
    #assert driver_config[4] == ('/dev/rsrc3/value', 'value3')

    #device_data = context_client.GetDevice(DeviceId(**DEVICE_INF_ID))
    #LOGGER.info('device_data.device_config.config_rules = \n{:s}'.format(
    #    '\n'.join([
    #        '{:s} {:s} = {:s}'.format(
    #            ConfigActionEnum.Name(config_rule.action), config_rule.resource_key, config_rule.resource_value)
    #        for config_rule in device_data.device_config.config_rules
    #    ])))


def test_device_delete_openconfig(
    context_client : ContextClient,     # pylint: disable=redefined-outer-name
    device_client : DeviceClient,       # pylint: disable=redefined-outer-name
    device_service : DeviceService):    # pylint: disable=redefined-outer-name

    device_client.DeleteDevice(DeviceId(**DEVICE_INF_ID))
    driver : _Driver = device_service.driver_instance_cache.get(DEVICE_INF_UUID, {})
    assert driver is None