#include <WiFi.h>
#include "DHTesp.h"
#define DHT_PIN 15
#define BUZZER 12
#include<PubSubClient.h>

WiFiClient espClient;
PubSubClient mqttClient(espClient);

char tempAr[6];
DHTesp dhtSensor;


void setup() {
  Serial.begin(115200);
  setupWiFi();
  setupMqtt();

  dhtSensor.setup(DHT_PIN,DHTesp::DHT22);
  pinMode(BUZZER,OUTPUT);
  digitalWrite(BUZZER,LOW);
}

void loop() {

  if(!mqttClient.connected()){
    connectToBroker();
  }

  mqttClient.loop();

  updateTemperature();
  Serial.println(tempAr);
  mqttClient.publish("ENTC-ADMIN-TEMP",tempAr);
  delay(1000);


}
void updateTemperature(){
  TempAndHumidity data =dhtSensor.getTempAndHumidity();
  String(data.temperature,2).toCharArray(tempAr,6);
}

void setupWiFi(){
  Serial.println();
  Serial.println("Connecting to");
  Serial.println("Wokwi-GUEST");
  WiFi.begin("Wokwi-GUEST");                      //connecting to wifi

  while (WiFi.status()!=WL_CONNECTED){           // if not connected retry again in half a second
    delay(500);
    Serial.print(".");

  }
  Serial.println("WIFi connected");
  Serial.println("IP Address");
  Serial.println(WiFi.localIP());

}


void buzzerOn(bool on){
  if(on){
    tone(BUZZER,256);
  }
  else{
    noTone(BUZZER);
  }

}




void receivedCallback(char*topic, byte* payload, unsigned int length){
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("]");

  char payloadCharAr[length];
  for(int i=0;i<length;i++){
    Serial.print((char)payload[i]);
    payloadCharAr[i]=(char)payload[i];
  }

  Serial.println();

  if (strcmp(topic,"ENTC-ADMIN-MAIN-ON-OFF")==0){
    if (payloadCharAr[0]=='1'){
      buzzerOn(true);
    }
    else{
      buzzerOn(false);
    }

  }
}

void setupMqtt(){
  mqttClient.setServer("broker.hivemq.com",1883);
  mqttClient.setCallback(receivedCallback); //this is not a keyword, this is calling a function called callback (customisable)
}

void connectToBroker(){
  while(!mqttClient.connected()){
    Serial.println("Attempting MQTT connection...");
    if(mqttClient.connect("ESP32-123456")){
      Serial.println("connected");
       // subscribe functions
       mqttClient.subscribe("ENTC-ADMIN-MAIN-ON-OFF");

    }
    else{
      Serial.println("Failed");
      Serial.print(mqttClient.state());
      delay(5000);

    }
  }
}