import network
from machine import Pin, SoftI2C
import dht
import ujson
import time
from lcd_api import LcdApi
from i2c_lcd import I2cLcd
from umqtt.simple import MQTTClient

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

led = Pin(5, Pin.OUT)
led1 = Pin(12, Pin.OUT)
sensor = dht.DHT22(Pin(14))
I2C_ADDR = 0x27
totalRows = 2
totalColumns = 16
i2c = SoftI2C(scl=Pin(22), sda=Pin(21), freq=10000) #initializing the I2C method for ESP32
lcd = I2cLcd(i2c, I2C_ADDR, totalRows, totalColumns)
lcd.putstr("Hello master")
h = -1
t = -1

# Connecting to wifi / mqtt server
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!")

prev_weather = ""

while True:
  sensor.measure() # read the parameters from the sensor
  if h != sensor.humidity() or t != sensor.temperature():# if the humidity or temperature is changed the LCD will display the value
    h = sensor.humidity()
    t = sensor.temperature()
  
    lcd.clear()
    lcd.move_to(0, 0)
    lcd.putstr("Humidity: ")
    lcd.putstr(str(h))
    lcd.move_to(0, 1)
    lcd.putstr("Temperature:")
    lcd.putstr(str(t))
  '''
  if the degree over 40C  -> The light turns on
  if the degree below 40C -> The light turns off
  '''
  if t > 40 :
       led.on()
  if t < 40 :
       led.off()

  if h < 50:
       led1.on()
  if h > 50:
       led1.off()

  print("Measuring weather conditions... ", end="")
  sensor.measure() 
  message = ujson.dumps({
    "temp": sensor.temperature(),
    "humidity": sensor.humidity(),
  })
  if message != prev_weather:
    print("Updated!")
    print("Reporting to MQTT topic {}: {}".format(MQTT_TOPIC, message))
    client.publish(MQTT_TOPIC, message)
    prev_weather = message
  else:
    print("No change")
  time.sleep(1)