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

# MQTT Server Parameters
MQTT_CLIENT_ID = "demoErick"
MQTT_BROKER = "broker.emqx.io"
MQTT_USER = ""
MQTT_PASSWORD = ""
MQTT_TOPIC_SENSOR = "pings/to"  
MQTT_TOPIC_LED = "pings/tu"     

# pin Untuk LDR sensor
LDR_PIN = ADC(Pin(34))  # 
LDR_PIN.atten(ADC.ATTN_11DB)  

# pin Untuk LED
LED_PIN = Pin(2, Pin.OUT)

# Function to read light level from the LDR sensor
def read_light_level():
    """Read raw value from the LDR sensor"""
    return LDR_PIN.read()  # Membaca value ADC (0-4095)

# Normalize the ADC reading (0-4095) to a percentage (0-100)
def normalize_light_level(raw_value):
    """Normalize ADC value to a percentage (0-100%)"""
    normalized = (raw_value / 4095) * 100  # Normalize to percentage
    return round(normalized, 2)  # Round to 2 decimal places

# Callback function to handle MQTT messages
def mqtt_callback(topic, msg):
    """Handle messages received via MQTT"""
    print("Message received on topic {}: {}".format(topic.decode(), msg.decode()))
    if topic.decode() == MQTT_TOPIC_LED:
        command = msg.decode().strip().lower()
        if command == "on":
            LED_PIN.value(1)  # Turn LED on
            print("LED turned on!")
        elif command == "off":
            LED_PIN.value(0)  # Turn LED off
            print("LED turned off!")

# WIFI Connection
def connect_wifi():
    """Connect to WiFi"""
    print("Trying to connect 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!")

# MQTT Server connection
def connect_mqtt():
    """Connect to the MQTT broker"""
    print("Trying to connect to MQTT server...", end="")

    client = MQTTClient(MQTT_CLIENT_ID, MQTT_BROKER, user=MQTT_USER, password=MQTT_PASSWORD)
    client.set_callback(mqtt_callback)
    client.connect()
    client.subscribe(MQTT_TOPIC_LED)
    print("Connected and subscribed to topic {}".format(MQTT_TOPIC_LED))
    return client

# Main loop to monitor and control
def main():
    """Main function to run monitoring and control loop"""
    # Connect to Wi-Fi and MQTT server
    connect_wifi()
    client = connect_mqtt()

    while True:
        try:
            # Check incoming MQTT messages
            client.check_msg()

            # Read and normalize light level
            light_level_raw = read_light_level()
            light_level_normalized = normalize_light_level(light_level_raw)

            # Display raw and normalized values for debugging
            print("Light level (raw): {}, Light level (normalized): {}%".format(light_level_raw, light_level_normalized))

            # Create message to send
            message = ujson.dumps({
                "light_level_raw": light_level_raw,
                "light_level_percentage": light_level_normalized
            })

            # Publish sensor data to MQTT topic
            client.publish(MQTT_TOPIC_SENSOR, message)
            print("Sensor data published: {}".format(message))

            # Delay for the next reading (1 second)
            time.sleep(1)

        except Exception as e:
            print("Error occurred: ", e)
            time.sleep(5)

# Run the main function directly
main()