/*	Lab Trial Test 1
	 *	Name:	Steven Chiang
    * Class: XXX
	 *	Date:10/1/2025
	*/ 
#include <WiFi.h>
#include <WiFiClient.h>
#include <PubSubClient.h>

int LEDState = 1;
long previousMillis = 0;
int interval = 1000;
char green_led = 18;

int LEDState_R = 1;
long previousMillis_R = 0;
int interval_R = 2000;
char red_led = 23;

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

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

WiFiClient espClient;
PubSubClient client(espClient);
const char* espClientName = "esp32Client_7363714n"; // 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 MQTTSubscribe() 
{
  // Subsccribe to your topics here
}

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

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

  setup_wifi();
  setup_MQTT();

  pinMode(green_led, OUTPUT);
  pinMode(red_led, OUTPUT);
}

void loop()
{
  if ( !client.connected() )
  {
    connectMQTT();
  }
  client.loop();
  
  long currentMillis = millis();

  if ( currentMillis - previousMillis >= interval)
  {
    previousMillis = currentMillis;
    if (LEDState == LOW)
    {
      LEDState = HIGH;
      
    }
    else
    {
      LEDState = LOW;
    }
    digitalWrite(green_led, LEDState);
 
  }

  if ( currentMillis - previousMillis_R >= interval_R)
  {
    previousMillis_R = currentMillis;
    if (LEDState_R == LOW)
    {
      LEDState_R = HIGH;
      client.publish("IOT/STEVEN/RLED", "Off");
      
    }
    else
    {
      LEDState_R = LOW;
      client.publish("IOT/STEVEN/RLED", "on");
    }
    digitalWrite(red_led, LEDState_R);
 
  }

}