#include <WiFi.h>
#include <WiFiClient.h>
#include <PubSubClient.h>

int ledPin = 23;  // Pin number for the Red 
int ledPin2 = 18; 

long previousMillis = 0;  // red
long interval = 1000;  // interval for Red

long previousMillis2 = 0;  // red
long interval2 = 1000;  // interval for Red
int state2 = 0; 

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

const char* hostname = "broker.hivemq.com";

WiFiClient espClient;
PubSubClient client(espClient);
const char* espClientName = "esp32Client_BenO"; // yourStudentID must be unique
int PORTNUM = 1883;

void setup_wifi()
{
  WiFi.begin(ssid, password);
  while(WiFi.status() != WL_CONNECTED )
  {
    delay(1000);
    Serial.print(".");
  }
  Serial.println();
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("Given IP by the router to ESP32 is ");
  Serial.println(WiFi.localIP());
}

void connectMQTT()
{
  while(!client.connected() )
  {
    Serial.println("Connecting to MQTT ...");
    if (client.connect(espClientName) ) //, mqttUser, mqttPassword) )
    {
      Serial.println("Connected");
      MQTTSubscribe();
    }
    else
    {
      Serial.print("Failed with state ");
      Serial.print(client.state() );
      delay(2000);
    }
  }
}

void callback(String topic, byte* payload, unsigned int length)
{
  String messageTemp;
  Serial.print("Message received in topic: ");
  Serial.print(topic);
  Serial.print(" length is: ");
  Serial.println(length);

  Serial.print("Data received from broker: ");
  for (int i = 0; i<length; i++)
  {
    Serial.print( (char)payload[i] );
    messageTemp += (char)payload[i];
  }

  if (topic == "S10245565/LT51G/LED") //Friends Names

  { 
  Serial.print("changing room LED to");
  if (messageTemp == "Off")
    {
    digitalWrite(ledPin2, HIGH);
    Serial.print ("Off");
    }
  else if (messageTemp == "On")
    {
    digitalWrite(ledPin2, LOW);
    Serial.print ("On");
    }
  }
}



void MQTTSubscribe() 
{
 client.subscribe ("S10245565/LT51G/LED"); //Friends name
}

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

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

  pinMode(ledPin,OUTPUT);
  pinMode(ledPin2,OUTPUT);

  setup_wifi();
  setup_MQTT();
}

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

  long currentMillis = millis(); 
  
  if (currentMillis - previousMillis >= interval) 
  {
    previousMillis = currentMillis; 

    if(digitalRead(ledPin) == HIGH) 
    {
      digitalWrite(ledPin, LOW);
    } 
    else 
    {
      digitalWrite(ledPin, HIGH);
    }
  }

  long currentMillis2 = millis(); 
    if (currentMillis2 - previousMillis2 >= interval2) 
  {
    previousMillis2 = currentMillis2; 


    if ( state2 ==0 )

    { 
      state2 = 1; 
      client.publish("BENOH/LT51G/LED", "On");
    }

    else

    { 
      state2 = 0;
      client.publish("BENOH/LT51G/LED", "Off");
    }  

  }
}