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

# Gunakan ID unik dengan chip ID
MQTT_CLIENT_ID = b"esp32_" + ubinascii.hexlify(machine.unique_id())
MQTT_BROKER = "broker.emqx.io"
MQTT_TOPIC_SENSOR = b"ambaNitro/arfin_desca_alzachri/LDR_sensor"
MQTT_TOPIC_LED = b"ambaNitro/arfin_desca_alzachri/aktuasi_led"

# Pin untuk LDR
LDR_PIN = ADC(Pin(34))
LDR_PIN.atten(ADC.ATTN_11DB)

# Pin untuk LED
LED_PIN = Pin(2, Pin.OUT)

# Fungsi konversi ADC ke lux
def adc_to_lux(adc_value):
    max_adc = 4095
    max_lux = 1000
    lux = (adc_value / max_adc) * max_lux
    return round(lux, 2)

# Baca nilai cahaya
def read_light_level():
    raw_value = LDR_PIN.read()
    lux_value = adc_to_lux(raw_value)
    return "Tingkat kecerahan adalah: {} lux".format(lux_value)

# Callback jika ada pesan masuk
def mqtt_callback(topic, msg):
    print("Pesan masuk:", topic, msg)
    if topic == MQTT_TOPIC_LED:
        command = msg.decode().strip().lower()
        if command == "on":
            LED_PIN.value(1)
        elif command == "off":
            LED_PIN.value(0)

# Hubungkan ke WiFi
def connect_wifi():
    sta_if = network.WLAN(network.STA_IF)
    if not sta_if.isconnected():
        print("Menghubungkan ke WiFi...")
        sta_if.active(True)
        sta_if.connect('Wokwi-GUEST', '')  # Ganti SSID jika perlu
        while not sta_if.isconnected():
            time.sleep(0.1)
    print("Terhubung ke WiFi:", sta_if.ifconfig())

# Hubungkan ke broker MQTT
def connect_mqtt():
    client = MQTTClient(MQTT_CLIENT_ID, MQTT_BROKER)
    client.set_callback(mqtt_callback)
    client.connect()
    client.subscribe(MQTT_TOPIC_LED)
    print("Terhubung ke MQTT broker dan subscribe topik.")
    return client

# Fungsi utama
def main():
    connect_wifi()
    client = connect_mqtt()

    while True:
        try:
            client.check_msg()  # Cek pesan masuk dari broker
            light_message = read_light_level()
            client.publish(MQTT_TOPIC_SENSOR, light_message)
            print("Dikirim:", light_message)
            time.sleep(2)
        except OSError:
            print("Koneksi terputus, mencoba ulang...")
            connect_wifi()
            client = connect_mqtt()
        except Exception as e:
            print("Error:", e)
            time.sleep(5)

# Jalankan
main()