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

# MQTT Server Parameters
MQTT_CLIENT_ID = ""
MQTT_BROKER = "160.187.144.142"
MQTT_USER = ""
MQTT_PASSWORD = ""
MQTT_TOPIC = "pcr/24mttka/test/ldr"

GAMMA = 0.7
RL10 = 50

sensor = ADC(Pin(4))
sensor.atten(ADC.ATTN_11DB)

print("Connecting to 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(" Connected!")

print("Connecting to MQTT server...", end="")

client = MQTTClient(
    MQTT_CLIENT_ID,
    MQTT_BROKER,
    user=MQTT_USER,
    password=MQTT_PASSWORD
)

client.connect()

print("Connected!")

while True:
    print("Membaca cahaya resistor...")

    sensor_value = int(sensor.read() / 4)

    print(sensor_value)

    voltage = sensor_value / 1024.0 * 5.0
    resistance = 2000.0 * voltage / (1 - voltage / 5.0)

    lux = math.pow(
        RL10 * 1e3 * math.pow(10, GAMMA) / resistance,
        1 / GAMMA
    )

    print(lux)

    message = ujson.dumps({
        "lux": lux,
        "isLight": True if lux >= 50 else False,
    })

    # Sesuai contoh Pak Agus:
    # client.publish(MQTT_TOPIC, message)
    client.publish(MQTT_TOPIC, str(lux))

    time.sleep(2)