from machine import Pin, I2C, ADC
import network
import time
import dht
import ujson
from umqtt.simple import MQTTClient
from DFRobot_RGBLCD1602 import DFRobot_RGBLCD1602  # Import the library

# I2C Setup for LCD1602
i2c = I2C(scl=Pin(4), sda=Pin(2), freq=100000)
lcd = DFRobot_RGBLCD1602(i2c)  # Initialize the LCD

# MQTT Server Parameters
MQTT_CLIENT_ID = "micropython-weather-demo"
MQTT_BROKER    = "broker.mqttdashboard.com"
MQTT_USER      = ""
MQTT_PASSWORD  = ""
MQTT_TOPIC     = "wokwi-weather"

sensor = dht.DHT22(Pin(15))
ldr = ADC(Pin(36))  # Initialize the LDR sensor on pin A0 (GPIO 36 for ESP32)

print("Connecting to WiFi", end="")
lcd.printStr("Connecting to WiFi")
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!")
lcd.clear()
lcd.printStr("Connected to WiFi!")

print("Connecting to MQTT server... ", end="")
client = MQTTClient(MQTT_CLIENT_ID, MQTT_BROKER, user=MQTT_USER, password=MQTT_PASSWORD)
client.connect()
print("Connected!")

prev_weather = ""
prev_ldr_value = -1  # To store the previous LDR value

while True:
    sensor.measure() 
    temperature = sensor.temperature()
    humidity = sensor.humidity()
    ldr_value = ldr.read()

    # Display on LCD
    lcd.clear()
    lcd.printStr("Temp: {}C\nHumidity: {}%".format(temperature, humidity))
    time.sleep(2)
    lcd.clear()
    lcd.printStr("Light Intensity:\n{}".format(ldr_value))
    time.sleep(2)

    message = ujson.dumps({
        "temp": temperature,
        "humidity": humidity,
    })

    if message != prev_weather:
        print("Weather Updated!")
        print("Reporting to MQTT topic {}: {}".format(MQTT_TOPIC, message))
        try:
            client.publish(MQTT_TOPIC, message)
        except OSError as e:
            print("MQTT Publish Error:", e)
        prev_weather = message

    if ldr_value != prev_ldr_value:
        print("LDR value updated!")
        ldr_message = ujson.dumps({
            "ldr": ldr_value
        })
        print("Reporting LDR value to MQTT topic {}: {}".format(MQTT_TOPIC, ldr_message))
        try:
            client.publish(MQTT_TOPIC, ldr_message)
        except OSError as e:
            print("MQTT Publish Error:", e)
        prev_ldr_value = ldr_value

    time.sleep(1)