"""
MicroPython IoT Weather Station Example for Wokwi.com

To view the data:

1. Go to http://www.hivemq.com/demos/websocket-client/
2. Click "Connect"
3. Under Subscriptions, click "Add New Topic Subscription"
4. In the Topic field, type "wokwi-weather" then click "Subscribe"

Now click on the DHT22 sensor in the simulation,
change the temperature/humidity, and you should see
the message appear on the MQTT Broker, in the "Messages" pane.

Copyright (C) 2022, Uri Shaked

https://wokwi.com/arduino/projects/322577683855704658
"""

import network
import time
from machine import Pin
import dht
import ujson
from umqtt.simple import MQTTClient
import urandom

def random_id(n=6):
    chars = "abcdefghijklmnopqrstuvwxyz0123456789"
    return "".join(chars[urandom.getrandbits(6) % len(chars)] for _ in range(n))

CLIENT_ID = "esp32-" + random_id()
SERVER    = "5232a6122a3a401aaeaa51b71372284c.s1.eu.hivemq.cloud"
USER      = "Wokwi123"
PASSWORD  = "Wokwi123"
topic     = "SalaFatec/weather" # "wokwi-weather" -> "SalaFatec/weather"

sensor = dht.DHT22(Pin(15))
led = Pin(13, Pin.OUT)

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(
    client_id=CLIENT_ID, 
    server=SERVER, 
    port=8883, 
    user=USER, 
    password=PASSWORD,
    ssl=True,
    ssl_params={"server_hostname": SERVER}
)

client.connect()

print("Connected!")

prev_weather = ""
last_message = 0

while True:
  print("Measuring weather conditions... ", end="")
  sensor.measure() 

  # liga o led caso a humidade esteja abaixo de 40%
  if sensor.humidity() <= 40:
    led.on()
  else:
    led.off();

  message = ujson.dumps({
    "temp": round(sensor.temperature(), 1), # casas decimais modificadas
    "humidity": round(sensor.humidity(), 1), # casas decimais modificadas
  })
  
  if message != prev_weather:
    print("Updated!")

    if sensor.temperature() >= 30.0:
        print("Reporting to MQTT topic {}: {}".format("sala101/alerta", message))

        client.publish("sala101/alerta", message) # mensagem de alerta
    else:
        print("Reporting to MQTT topic {}: {}".format("SalaFatec/weather", message))
        client.publish("salaFatec/weather", message)
    
    prev_weather = message

  else:
    print("No change")

  time.sleep(5) # 1 -> 5 segundos