/*	Lab Trial Test 1
	 *	Name:	KOH XIANG LING
    * Class: DEM1
	 *	Date: 10 JAN 2025
	*/ 

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

const char* ssid = "Wokwi-GUEST";	// Given by Wokwi
const char* password = "";	// no password
const char* hostname = "broker.hivemq.com"; // MQTT broker address that we are connecting
int GLEDState = 1;
long GpreviousMillis = 0;
int Ginterval = 1000;

int RLEDState = 1;
long RpreviousMillis = 0;
int Rinterval = 2000;

//Initializes the espClient
WiFiClient espClient;
PubSubClient client(espClient);
const char* espClientName = "esp32Client_koh1";
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 setup_MQTT()
{
  client.setServer(hostname, PORTNUM);
  client.setCallback(callback); 
}

void MQTTSubscribe()
{
  // There is no topics to subscribe at this moment
  client.subscribe("IoT/8096378B");
}

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 == "IoT/8096378B")
  {
    Serial.print("Changing room LED to ");
    if (messageTemp == "Off")
    {
      digitalWrite(19, HIGH);
      Serial.print("Off");
     
         }
    else if (messageTemp == "On")
    {
      digitalWrite(19, LOW);
      Serial.print("On");
      
    }
  }
}

void setup() 
{
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(18, OUTPUT);
  pinMode(23, OUTPUT);
  pinMode(19, OUTPUT);
  setup_wifi();
  setup_MQTT();
}

void loop() 
{
  // put your main code here, to run repeatedly:
  if ( !client.connected() )
  {
    connectMQTT();
  }
  client.loop();

 long GcurrentMillis = millis();
  if ( GcurrentMillis-GpreviousMillis >= Ginterval)

  {
    GpreviousMillis = GcurrentMillis;
    if (GLEDState == LOW)
    {
      GLEDState = HIGH;
    }
    else
    {
      GLEDState = LOW;
    }
    digitalWrite(18, GLEDState);
  }


long RcurrentMillis = millis();
    if ( RcurrentMillis-RpreviousMillis >= Rinterval)

  {
    RpreviousMillis = RcurrentMillis;
    if (RLEDState == LOW)
    {
      RLEDState = HIGH;
      client.publish ("IoT/8096378B", "Off");
    }
    else
    {
      RLEDState = LOW;
      client.publish ("IoT/8096378B", "On");
    }
    digitalWrite(23, RLEDState);
  }


}