import paho.mqtt.client as mqtt
from logger import _LOGGER


class MqttClient:

  def __init__(self, config):
    self._config = config
    self._mqttc = mqtt.Client(client_id=self.client_id,
                              clean_session=False,
                              userdata = {'global_topic_prefix': self.topic_prefix})

    if self.username and self.password:
      self.mqttc.username_pw_set(self.username, self.password)

    self.mqttc.connect(self.hostname, port=self.port)
    self.mqttc.loop_start()

  def publish(self, messages):
    if not messages:
      return

    for m in messages:
      topic = "{}/{}".format(self.topic_prefix, m.topic) if self.topic_prefix else m.topic
      self.mqttc.publish(topic, m.payload)

  @property
  def client_id(self):
    return self._config['client_id'] if 'client_id' in self._config else 'bt-mqtt-gateway'

  @property
  def hostname(self):
    return self._config['host']

  @property
  def port(self):
    return self._config['port'] if 'port' in self._config else 1883

  @property
  def username(self):
    return self._config['username'] if 'username' in self._config else None

  @property
  def password(self):
    return self._config['password'] if 'password' in self._config else None

  @property
  def topic_prefix(self):
    return self._config['topic_prefix'] if 'topic_prefix' in self._config else None

  @property
  def mqttc(self):
    return self._mqttc

  def callbacks_subscription(self, callbacks):
    for topic, callback in callbacks:
      topic = "{}/{}".format(self.topic_prefix, topic) if self.topic_prefix else topic
      _LOGGER.debug("Subscribing to: %s" % topic)
      self.mqttc.message_callback_add(topic, callback)
      self.mqttc.subscribe(topic)


class MqttMessage:
  def __init__(self, topic=None, payload=None):
    self._topic = topic
    self._payload = payload

  @property
  def topic(self):
    return self._topic

  @topic.setter
  def topic(self, new_topic):
    self._topic = new_topic

  @property
  def payload(self):
    return self._payload

  @property
  def as_dict(self):
    return {
      'topic': self.topic,
      'payload': self.payload
    }

  def __repr__(self):
    return self.as_dict.__str__()

  def __str__(self):
    return self.__repr__()