#!/usr/bin/env python3
"""
Contains MQTT funtionality.
"""
import asyncio

import paho.mqtt.client as mqtt

from models import network

def on_connect(client, userdata, flags, rc):
	"""Called when the client successfully connects to the broker."""
	client.subscribe("juice/#")
	for device in network:
		if device.mqtt_root:
			client.subscribe(device.mqtt_root + '/#')


def on_message(client, userdata, msg):
	"""Called when the client receives a message."""
	root = msg.topic.partition('/')[0]
	devices = [device for device in network if root == device.mqtt_root]
	for device in devices:
		coro = device.mqtt_callback(client.app, msg)
		future = asyncio.run_coroutine_threadsafe(coro, client.app.loop)
		future.result()


def init_client(app):
	"""Initializes the MQTT client."""
	client = mqtt.Client()
	client.app = app
	client.on_connect = on_connect
	client.on_message = on_message

	client.connect_async("localhost", 1883, 60)
	client.loop_start()
	return client