#include <WiFi.h>
#include <WiFiClient.h>
#include <PubSubClient.h>
#include <LiquidCrystal_I2C.h>
#define Sensor A0


LiquidCrystal_I2C lcd(0x27,16,2);

const float BETA = 3950;

int ledPin = 2; 		// GPIO do LED
int ledState = LOW; 	//ESTADO DO LED
long previousMillis = 0; 	// will store last time LED
int interval = 1000;	//Intervalo para o Blink

const char* ssid = "Wokwi-GUEST";
const char* password = "";

const char* hostname = "test.mosquitto.org";

WiFiClient espClient;
PubSubClient client(espClient);
const char* espClientName = "10005"; //Esse ID deverá ser unico
int PORTNUM = 1883;

void setup_wifi()
{
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED )
  {
    delay(1000);
    Serial.print(".");
  }
  Serial.println();
  Serial.print("Conectado a rede SSID: ");
  Serial.println(ssid);
  Serial.print("IP: ");
  Serial.println(WiFi.localIP());
}

void connectMQTT()
{
  while (!client.connected() )
  {
    Serial.println("Conectando ao MQTT ...");
    if (client.connect(espClientName) ) //, mqttUser, mqttPassword) )
    {
      Serial.println("Conectado");
      MQTTSubscribe();
    }
    else
    {
      Serial.print("Falha com Estado: ");
      Serial.print(client.state() );
      delay(2000);
    }
  }
}

void callback(String topic, byte* payload, unsigned int length)
{ 
  lcd.setCursor(1,1);
  String messageTemp;
  Serial.print("Mensagem recebida no TOPICO:");
  Serial.print(topic);
  Serial.print("O Tamanho da Mensagem: ");
  Serial.println(length);

  Serial.print("Dados Recebidos no Broker: ");
  for (int i = 0; i < length; i++)
  {
    messageTemp += (char)payload[i];
  }
  if (topic == "lucasjurema")
  {
    if (messageTemp == "Off")
    {
      digitalWrite(ledPin, LOW);

      Serial.println("Off");
    }
    else if (messageTemp == "On")
    {
      digitalWrite(ledPin, HIGH);
      Serial.println("On");
    }
  }
}

void MQTTSubscribe()
{
  client.subscribe("lucasjurema");
}

void setup_MQTT()
{
  client.setServer(hostname, PORTNUM);
  client.setCallback(callback);
}

void setup()
{
  Serial.begin(9600);
  delay(5000);
  lcd.init();
  lcd.backlight();

  setup_wifi();
  setup_MQTT();
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);

}

void loop()
{

  int analogValue = analogRead(Sensor);
  float celsius = 1 / (log(1 / (4095. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;

  lcd.setCursor(0,2);
  lcd.print(celsius);

  Serial.print(" Temperatura: ");
  Serial.print(celsius);
  Serial.println(" ºC");

  if ( !client.connected() )
  {
    connectMQTT();
  }
  client.loop();

  
  long currentMillis = millis();

  if ( currentMillis - previousMillis >= interval)
  {
    previousMillis = currentMillis; // save the last time you blinked the LED
      String potString = String(celsius);
      client.publish("lucasjurema", potString.c_str());
  }

}