#include "DHT.h"
#include "WiFi.h"
#include "PubSubClient.h"

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttServer = "broker.hivemq.com";
const char* clientID = "ESP32WokwiTutorial";

int DHTPin = 14;
int RedLED = 2;

WiFiClient espClient;
PubSubClient client(espClient);

void setupWiFi() {
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("WiFi Connected");
}

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

  if (String(topic) == "/ESP32/LED/RED") {
    if (data == "ON") {
      digitalWrite(RedLED, HIGH);
    }
    else if (data == "OFF")
    {
      digitalWrite(RedLED, LOW);
    }
  }


}


DHT dht(DHTPin, DHT22);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(RedLED, OUTPUT);
  dht.begin();
  setupWiFi();
  client.setServer(mqttServer, 1883);
  client.setCallback(callback);

}

void reconnect(){

  while(!client.connected()){
    if(client.connect(clientID)){
      client.subscribe("/ESP32/LED/RED");
    }
    else{
      Serial.println("Failed,rc=");
      Serial.print(client.state());
      Serial.println("Trying again in 5 seconds");
      delay(5000);
    }
  }


}

void loop() {

  if (!client.connected()){
    reconnect();
  }
  client.loop();
  float temp = dht.readTemperature();
  float humidity = dht.readHumidity();
  Serial.println("Temperature : " + String(temp));
  Serial.println("Humidity :" + String(humidity));
  String datatoSend = String(temp);
  byte arrSize;
  arrSize = datatoSend.length() + 1;
  char msg[arrSize];
  datatoSend.toCharArray(msg,arrSize);

  client.publish("/ESP32/temp",msg);

  datatoSend = String(humidity);
  arrSize = datatoSend.length() + 1;
  char msg2[arrSize];
  datatoSend.toCharArray(msg2,arrSize);

  client.publish("/ESP32/humidity",msg2);
  delay(1000);
}