text: import json
  import logging
  import os
  import threading
  from time import sleep
  from typing import Callable
  
  import paho.mqtt.client as mqtt
  
  from .coco_device_class import CoCoDeviceClass
  from .coco_fan import CoCoFan
  from .coco_light import CoCoLight
  from .coco_shutter import CoCoShutter
  from .coco_switch import CoCoSwitch
  from .coco_switched_fan import CoCoSwitchedFan
  from .coco_generic import CoCoGeneric
  from .const import *
  from .helpers import *
  
  _LOGGER = logging.getLogger(__name__)
  sem = threading.Semaphore()
  DEVICE_SETS = {
      CoCoDeviceClass.SWITCHED_FANS: {INTERNAL_KEY_CLASS: CoCoSwitchedFan, INTERNAL_KEY_MODELS: LIST_VALID_SWITCHED_FANS},
      CoCoDeviceClass.FANS: {INTERNAL_KEY_CLASS: CoCoFan, INTERNAL_KEY_MODELS: LIST_VALID_FANS},
      CoCoDeviceClass.SHUTTERS: {INTERNAL_KEY_CLASS: CoCoShutter, INTERNAL_KEY_MODELS: LIST_VALID_SHUTTERS},
      CoCoDeviceClass.SWITCHES: {INTERNAL_KEY_CLASS: CoCoSwitch, INTERNAL_KEY_MODELS: LIST_VALID_SWITCHES},
      CoCoDeviceClass.LIGHTS: {INTERNAL_KEY_CLASS: CoCoLight, INTERNAL_KEY_MODELS: LIST_VALID_LIGHTS},
      CoCoDeviceClass.GENERIC: {INTERNAL_KEY_CLASS: CoCoGeneric, INTERNAL_KEY_MODELS: LIST_VALID_GENERICS}
  }
  
  
  class CoCo:
      def __init__(self, address, username, password, port=8883, ca_path=None, switches_as_lights=False):
  
          if switches_as_lights:
              DEVICE_SETS[CoCoDeviceClass.LIGHTS] = {INTERNAL_KEY_CLASS: CoCoLight,
                                                     INTERNAL_KEY_MODELS: LIST_VALID_LIGHTS + LIST_VALID_SWITCHES}
              DEVICE_SETS[CoCoDeviceClass.SWITCHES] = {INTERNAL_KEY_CLASS: CoCoSwitch, INTERNAL_KEY_MODELS: []}
          # The device control buffer fields
          self._keep_thread_running = True
          self._device_control_buffer = {}
          self._device_control_buffer_size = DEVICE_CONTROL_BUFFER_SIZE
          self._device_control_buffer_command_size = DEVICE_CONTROL_BUFFER_COMMAND_SIZE
          self._device_control_buffer_command_count = 0
          self._device_control_buffer_thread = threading.Thread(target=self._publish_device_control_commands)
          self._device_control_buffer_thread.start()
  
          if ca_path is None:
              ca_path = os.path.dirname(os.path.realpath(__file__)) + MQTT_CERT_FILE
          client = mqtt.Client(protocol=MQTT_PROTOCOL, transport=MQTT_TRANSPORT)
          client.username_pw_set(username, password)
          client.tls_set(ca_path)
          client.tls_insecure_set(True)
          self._client = client
          self._address = address
          self._port = port
          self._profile_creation_id = username
          self._all_devices = None
          self._device_callbacks = {}
          self._devices = {}
          self._devices_callback = {}
          self._system_info = None
          self._system_info_callback = lambda x: None
  
      def __del__(self):
          self._keep_thread_running = False
          self._client.disconnect()
  
      def connect(self):
  
          def _on_message(client, userdata, message):
              topic = message.topic
              response = json.loads(message.payload)
  
              if topic == self._profile_creation_id + MQTT_TOPIC_PUBLIC_RSP and \
                      response[KEY_METHOD] == MQTT_METHOD_SYSINFO_PUBLISH:
                  self._system_info = response
                  self._system_info_callback(self._system_info)
  
              elif topic == (self._profile_creation_id + MQTT_TOPIC_SUFFIX_RSP) and \
                      response[KEY_METHOD] == MQTT_METHOD_DEVICES_LIST:
                  self._client.unsubscribe(self._profile_creation_id + MQTT_TOPIC_SUFFIX_RSP)
                  self._process_devices_list(response)
  
              elif topic == (self._profile_creation_id + MQTT_TOPIC_SUFFIX_SYS_EVT) and \
                      response[KEY_METHOD] == MQTT_METHOD_SYSINFO_PUBLISHED:
                  # If the connected controller publishes sysinfo... we expect something to have changed.
                  client.subscribe(self._profile_creation_id + MQTT_TOPIC_SUFFIX_RSP, qos=1)
                  client.publish(self._profile_creation_id + MQTT_TOPIC_SUFFIX_CMD,
                                 json.dumps({KEY_METHOD: MQTT_METHOD_DEVICES_LIST}), 1)
  
              elif topic == (self._profile_creation_id + MQTT_TOPIC_SUFFIX_EVT) \
                      and (response[KEY_METHOD] == MQTT_METHOD_DEVICES_STATUS or response[
                  KEY_METHOD] == MQTT_METHOD_DEVICES_CHANGED):
                  devices = extract_devices(response)
                  for device in devices:
                      try:
                          if KEY_UUID in device:
                              self._device_callbacks[device[KEY_UUID]][INTERNAL_KEY_CALLBACK](device)
                      except:
                          pass
  
          def _on_connect(client, userdata, flags, rc):
              if rc == 0:
                  _LOGGER.info('Connected!')
                  client.subscribe(self._profile_creation_id + MQTT_TOPIC_SUFFIX_RSP, qos=1)
                  client.subscribe(self._profile_creation_id + MQTT_TOPIC_PUBLIC_RSP, qos=1)
                  client.subscribe(self._profile_creation_id + MQTT_TOPIC_SUFFIX_EVT, qos=1)
                  client.subscribe(self._profile_creation_id + MQTT_TOPIC_SUFFIX_SYS_EVT, qos=1)
                  client.publish(self._profile_creation_id + MQTT_TOPIC_PUBLIC_CMD,
                                 json.dumps({KEY_METHOD: MQTT_METHOD_SYSINFO_PUBLISH}), 1)
                  client.publish(self._profile_creation_id + MQTT_TOPIC_SUFFIX_CMD,
                                 json.dumps({KEY_METHOD: MQTT_METHOD_DEVICES_LIST}), 1)
              elif MQTT_RC_CODES[rc]:
                  raise Exception(MQTT_RC_CODES[rc])
              else:
                  raise Exception('Unknown error')
  
          def _on_disconnect(client, userdata, rc):
              _LOGGER.warning('Disconnected')
              for uuid, device_callback in self._device_callbacks.items():
                  offline = {'Online': 'False', KEY_UUID: uuid}
                  device_callback[INTERNAL_KEY_CALLBACK](offline)
  
          self._client.on_message = _on_message
          self._client.on_connect = _on_connect
          self._client.on_disconnect = _on_disconnect
  
          self._client.connect_async(self._address, self._port)
          self._client.loop_start()
  
      def disconnect(self):
          self._client.loop_stop()
          self._client.disconnect()
  
      def get_systeminfo(self, callback):
          self._system_info_callback = callback
          if self._system_info:
              self._system_info_callback(self._system_info)
  
      def get_devices(self, device_class: CoCoDeviceClass, callback: Callable):
          self._devices_callback[device_class] = callback
          if self._devices and device_class in self._devices:
              self._devices_callback[device_class](self._devices[device_class])
  
      def _publish_device_control_commands(self):
          while self._keep_thread_running:
              device_commands_to_process = None
              sem.acquire()
              if len(self._device_control_buffer.keys()) > 0:
                  device_commands_to_process = self._device_control_buffer
              self._device_control_buffer = {}
              self._device_control_buffer_command_count = 0
              sem.release()
              if device_commands_to_process is not None:
                  command = process_device_commands(device_commands_to_process)
                  self._client.publish(self._profile_creation_id + MQTT_TOPIC_SUFFIX_CMD, json.dumps(command), 1)
              sleep(0.05)
  
      def _add_device_control(self, uuid, property_key, property_value):
          while len(self._device_control_buffer.keys()) >= self._device_control_buffer_size or \
                  self._device_control_buffer_command_count >= self._device_control_buffer_command_size:
              pass
          sem.acquire()
          self._device_control_buffer_command_count += 1
          if uuid not in self._device_control_buffer:
              self._device_control_buffer[uuid] = {}
          self._device_control_buffer[uuid][property_key] = property_value
          sem.release()
  
      # Processes response on devices.list
      def _process_devices_list(self, response):
  
          # Only add devices that are actionable
          actionable_devices = list(
              filter(lambda d: d[KEY_TYPE] == DEV_TYPE_ACTION, extract_devices(response)))
  
          # Only prepare for devices that don't already exist
          # TODO - Can't we do this when we need it (in initialize_devices ?)
          existing_uuids = list(self._device_callbacks.keys())
          for actionable_device in actionable_devices:
              if actionable_device[KEY_UUID] not in existing_uuids:
                  self._device_callbacks[actionable_device[KEY_UUID]] = \
                      {INTERNAL_KEY_CALLBACK: None, KEY_ENTITY: None}
  
          # Initialize
          self.initialize_devices(CoCoDeviceClass.SWITCHED_FANS, actionable_devices)
          self.initialize_devices(CoCoDeviceClass.FANS, actionable_devices)
          self.initialize_devices(CoCoDeviceClass.SWITCHES, actionable_devices)
          self.initialize_devices(CoCoDeviceClass.LIGHTS, actionable_devices)
          self.initialize_devices(CoCoDeviceClass.SHUTTERS, actionable_devices)
          self.initialize_devices(CoCoDeviceClass.GENERIC, actionable_devices)
  
      def initialize_devices(self, device_class, actionable_devices):
  
          base_devices = [x for x in actionable_devices if x[KEY_MODEL]
                          in DEVICE_SETS[device_class][INTERNAL_KEY_MODELS]]
          if device_class not in self._devices:
              self._devices[device_class] = []
          for base_device in base_devices:
              if self._device_callbacks[base_device[KEY_UUID]] and self._device_callbacks[base_device[KEY_UUID]][
                  KEY_ENTITY] and \
                      self._device_callbacks[base_device[KEY_UUID]][KEY_ENTITY].uuid:
                  self._device_callbacks[base_device[KEY_UUID]][KEY_ENTITY].update_dev(base_device)
              else:
                  self._device_callbacks[base_device[KEY_UUID]][KEY_ENTITY] = \
                      DEVICE_SETS[device_class][INTERNAL_KEY_CLASS](base_device,
                                                                    self._device_callbacks[
                                                                        base_device[
                                                                            KEY_UUID]],
                                                                    self._client,
                                                                    self._profile_creation_id,
                                                                    self._add_device_control)
                  self._devices[device_class].append(self._device_callbacks[base_device[KEY_UUID]][KEY_ENTITY])
          if device_class in self._devices_callback:
              self._devices_callback[device_class](self._devices[device_class])
  