import network
import time
from machine import Pin, ADC
from umqtt.simple import MQTTClient

# Configuración MQTT
MQTT_CLIENT_ID = "micropython-led-control"
MQTT_BROKER    = "broker.mqttdashboard.com"
MQTT_TOPIC     = "led/control"  # Tópico al que se suscribirá
MQTT_STATUS    = "led/status"   # Tópico para publicar el estado del LED

# Inicializar LED en pin 2
led = Pin(2, Pin.OUT)

# Inicializar sensor de luz en pin ADC (GPIO34)
ldr = ADC(Pin(34))
ldr.atten(ADC.ATTN_11DB)  # Configurar rango de lectura (0-3.3V)

# Umbral de luz (ajusta según sea necesario)
LIGHT_THRESHOLD = 2000  # Valor bajo indica oscuridad

# Estado del LED
led_state = 0  # 0 = Apagado, 1 = Encendido

# Función callback que se ejecuta al recibir un mensaje
def on_message(topic, msg):
    global led_state
    print("Mensaje recibido:", msg)
    if msg == b"ON":
        led.value(1)
        led_state = 1
        print("LED ENCENDIDO")
    elif msg == b"OFF":
        led.value(0)
        led_state = 0
        print("LED APAGADO")

# Publicar el estado del LED en MQTT
def publish_led_status():
    client.publish(MQTT_STATUS, str(led_state))

# Conexión WiFi
print("Conectando al WiFi...", end="")
sta_if = network.WLAN(network.STA_IF)
sta_if.active(True)
sta_if.connect('Wokwi-GUEST', '')
while not sta_if.isconnected():
    print(".", end="")
    time.sleep(0.1)
print(" ¡Conectado!")

# Conexión al broker MQTT
print("Conectando al broker MQTT... ", end="")
client = MQTTClient(MQTT_CLIENT_ID, MQTT_BROKER)
client.set_callback(on_message)
client.connect()
client.subscribe(MQTT_TOPIC)
print("¡Conectado y suscrito al tópico!")

# Bucle principal
try:
    while True:
        # Leer el valor del sensor de luz
        light_value = ldr.read()
        print("Valor del sensor de luz:", light_value)

        # Control automático del LED
        if light_value < LIGHT_THRESHOLD and led_state == 0:
            led.value(1)
            led_state = 1
            print("AUTO: LED ENCENDIDO")
            publish_led_status()
        elif light_value >= LIGHT_THRESHOLD and led_state == 1:
            led.value(0)
            led_state = 0
            print("AUTO: LED APAGADO")
            publish_led_status()

        # Revisar si hay mensajes nuevos en MQTT
        client.check_msg()
        time.sleep(0.5)
except KeyboardInterrupt:
    print("Desconectando...")
    client.disconnect()