import grpc, logging
from common.tools.client.RetryDecorator import retry, delay_exponential
from device.proto.context_pb2 import Device, DeviceConfig, DeviceId, Empty
from device.proto.device_pb2 import MonitoringSettings
from device.proto.device_pb2_grpc import DeviceServiceStub

LOGGER = logging.getLogger(__name__)
MAX_RETRIES = 15
DELAY_FUNCTION = delay_exponential(initial=0.01, increment=2.0, maximum=5.0)

class DeviceClient:
    def __init__(self, address, port):
        self.endpoint = '{:s}:{:s}'.format(str(address), str(port))
        LOGGER.debug('Creating channel to {:s}...'.format(str(self.endpoint)))
        self.channel = None
        self.stub = None
        self.connect()
        LOGGER.debug('Channel created')

    def connect(self):
        self.channel = grpc.insecure_channel(self.endpoint)
        self.stub = DeviceServiceStub(self.channel)

    def close(self):
        if self.channel is not None: self.channel.close()
        self.channel = None
        self.stub = None

    @retry(exceptions=set(), max_retries=MAX_RETRIES, delay_function=DELAY_FUNCTION, prepare_method_name='connect')
    def AddDevice(self, request : Device) -> DeviceId:
        LOGGER.debug('AddDevice request: {:s}'.format(str(request)))
        response = self.stub.AddDevice(request)
        LOGGER.debug('AddDevice result: {:s}'.format(str(response)))
        return response

    @retry(exceptions=set(), max_retries=MAX_RETRIES, delay_function=DELAY_FUNCTION, prepare_method_name='connect')
    def ConfigureDevice(self, request : Device) -> DeviceId:
        LOGGER.debug('ConfigureDevice request: {:s}'.format(str(request)))
        response = self.stub.ConfigureDevice(request)
        LOGGER.debug('ConfigureDevice result: {:s}'.format(str(response)))
        return response

    @retry(exceptions=set(), max_retries=MAX_RETRIES, delay_function=DELAY_FUNCTION, prepare_method_name='connect')
    def DeleteDevice(self, request : DeviceId) -> Empty:
        LOGGER.debug('DeleteDevice request: {:s}'.format(str(request)))
        response = self.stub.DeleteDevice(request)
        LOGGER.debug('DeleteDevice result: {:s}'.format(str(response)))
        return response

    @retry(exceptions=set(), max_retries=MAX_RETRIES, delay_function=DELAY_FUNCTION, prepare_method_name='connect')
    def GetInitialConfig(self, request : DeviceId) -> DeviceConfig:
        LOGGER.debug('GetInitialConfig request: {:s}'.format(str(request)))
        response = self.stub.GetInitialConfig(request)
        LOGGER.debug('GetInitialConfig result: {:s}'.format(str(response)))
        return response

    @retry(exceptions=set(), max_retries=MAX_RETRIES, delay_function=DELAY_FUNCTION, prepare_method_name='connect')
    def MonitorDeviceKpi(self, request : MonitoringSettings) -> Empty:
        LOGGER.debug('MonitorDeviceKpi request: {:s}'.format(str(request)))
        response = self.stub.MonitorDeviceKpi(request)
        LOGGER.debug('MonitorDeviceKpi result: {:s}'.format(str(response)))
        return response