import time
import network
from umqtt.simple import MQTTClient
import ujson
from machine import Pin
# uasyncio针对的是esp32,一般的micropython是asyncio
import uasyncio

LEDPIN2 = 4
led2 = Pin(LEDPIN2, Pin.OUT)

LEDPIN = 15
led = Pin(LEDPIN, Pin.OUT)
LEDBUILTIN = 2
ledbuiltin = Pin(LEDBUILTIN, Pin.OUT)
lightStatus = False
sta_if = network.WLAN(network.STA_IF)
counter = 0

def get_msg(topic, msg):
    print("Incoming message:", msg)
    print("Incoming topic:", topic)
    responseTopic = topic
    responseTopic = responseTopic.replace(b"request",b"response")
    try:
        msg = ujson.loads(msg)
        print(msg)
        if(msg['method']=='command' and msg['params']): 
            led.on()
            client.publish(responseTopic,'''{"light": "on"}''')
        else: 
            led.off()
            client.publish(responseTopic,'''{"light": "off"}''')
    except Exception as e:
        print("Error:", e)    


async def lightloop():
    light2status = False
    while True:
        light2status = not light2status
        if light2status:
            led2.on()
        else:
            led2.off()
        await uasyncio.sleep(3)


async def mainloop():
    global lightStatus
    global counter
    while True:
        lightStatus = not lightStatus
        if lightStatus: 
            ledbuiltin.on()
        else:
            ledbuiltin.off()
            
        print('wifi status', sta_if.status())
        if(not sta_if.isconnected()):
            print("wifi reconnectting...")
            while not sta_if.isconnected(): 
                await uasyncio.sleep(1)
                pass
            print("WiFi connected")
            print("MQTT reconnecting...")
            client.connect(False) # 重新連線時也採用 False 不清除會談資料
            print("MQTT reconected.")
            client.set_callback(get_msg)
            client.subscribe(b'v1/devices/cxy/rpc/request')
        try:
            client.check_msg()
            print(counter)
            counter = counter + 1
            if(counter%10==0): 
                client.ping()
                message = ujson.dumps({
                    "counter": counter
                })
                client.publish(b'v1/devices/cxy/telemetry', message)
                print('publish message:', message)
            await uasyncio.sleep(1)
        except OSError as e:
            print("MQTT disconnectted, now reconnecting...")
            client.connect(False) # 重新連線時也採用 False 不清除會談資料
            print("MQTT reconected.")
            client.set_callback(get_msg)
            client.subscribe(b'v1/devices/cxy/rpc/request')

   

if __name__ == '__main__':
    sta_if.active(True)
    sta_if.connect('Wokwi-GUEST', '')
    while not sta_if.isconnected():
        time.sleep(0.5)
        print(".", end="")
        pass
    print("WiFi connected")
    client = MQTTClient(
        client_id="client123133412232145", 
        keepalive=9,
        server="broker.emqx.io", 
        ssl=False)
    client.connect()
    print('Mqtt server connected.')
    client.set_callback(get_msg)
    client.subscribe(b'v1/devices/cxy/rpc/request')
    # 以上代码是同步代码，以下代码使用异步代码，ESP32使用的micropython要导入的不是asyncio，而是uasyncio
    # 启动异步的2个协程任务：
    # task1: mainloop()监测wifi和mqtt连接是否断开，断开则重连，用一个内置的led灯指示该循环，1秒钟循环一次
    # task2: lightloop()每2秒切换天蓝色led灯状态
    uasyncio.run(uasyncio.gather(mainloop(),lightloop()))