#include <WiFi.h>
#include "PubSubClient.h"
#include <OneWire.h>
#include <DallasTemperature.h>

OneWire oneWire(4);
DallasTemperature sensor(&oneWire);

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttServer = "broker.emqx.io";
int port = 1883;
char clientId[50];

WiFiClient espClient;
PubSubClient client(espClient);

unsigned long lastMsg = 0;
#define MSG_BUFFER_SIZE	(50)
char msg[MSG_BUFFER_SIZE];
int value = 0;

const int ledPin = 2;

void setup() {
  Serial.begin(115200);
  randomSeed(analogRead(0));
  delay(2);
  sensor.begin();
  delay(20);

  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  wifiConnect();

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  
  client.setServer(mqttServer, port);
  client.setCallback(callback);
  pinMode(ledPin, OUTPUT);
}

void wifiConnect() {
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
}

void mqttReconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    long r = random(1000);
    sprintf(clientId, "clientId-%ld", r);
    if (client.connect(clientId)) {
      Serial.print(clientId);
      Serial.println(" connected");
      client.subscribe("inTopic2CTC053");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.print(topic);
  Serial.print(". Message: ");
  String stMessage;
  
  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    stMessage += (char)message[i];
  }
  Serial.println();

  if (String(topic) == "inTopic2CTC059") {
    Serial.print("Changing output to ");
    if(stMessage == "1"){
      Serial.println("on");
      digitalWrite(ledPin, HIGH);
    }
    else if(stMessage == "0"){
      Serial.println("off");
      digitalWrite(ledPin, LOW);
    }
  }
}

void loop() {
  delay(10);
  if (!client.connected()) {
    mqttReconnect();
  }
  client.loop();
  unsigned long now = millis();
  if (now - lastMsg > 2000) {
    lastMsg = now;
    //++value;
    sensor.requestTemperatures();
    Serial.print("Temperature is: ");
    delay(10);
    Serial.print(sensor.getTempCByIndex(0));
    Serial.println("°C");
    delay(1000);
    snprintf (msg, MSG_BUFFER_SIZE, "Suhunya #%.2f", sensor.getTempCByIndex(0));
    Serial.print("Publish message: ");
    Serial.println(msg);
    client.publish("outTopic2CTC053", msg);
  }
}