#include "WiFi.h"
#include "PubSubclient.h"
#include <FastLED.h>

char clientId[50];
WiFiClient espClient;
PubSubClient client(espClient);
CRGB leds[1];

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  WiFi.mode(WIFI_STA);
  WiFi.begin("Wokwi-GUEST","");
  client.setServer("broker.emqx.io",1883);
  client.setCallback(callback);
  FastLED.addLeds<NEOPIXEL,5>(leds,1);
}

void mqttReconnect(){
  while(!client.connect()){
    Serial.print("Attempting MQTT connection.....");
    if(client.connect(clientId)){
      Serial.print("Connected");
      client.subscribe('topicName');
    }
    else{
      Serial.println("Connection failed try again in 5 seconds");
      delay(5000);
    }
  }

}

void callback(char* topic, byte* message, unsigned int length) 
{
  String stMessage;
  for (int i = 0; i < length; i++) 
  {
    stMessage += (char)message[i];
  }
 // Add codes to control NeoPixel LED
 if(stMessage == "out"){
  leds[0] = CRGB::Red;
  FastLED.show();
  Serial.println("Out!!");
 }
 else if(stMessage == "not out"){
  leds[0] = CRGB::Green;
  FastLED.show();
  Serial.println("Not Out!!");
 }
 else{
  leds[0] = CRGB::Blue;
  FastLED.show();
  Serial.println("Decision Pending!!");
 }
}

void loop() 
{
  delay(100);
  if (!client.connected()) 
  {
    mqttReconnect();
  }
  client.loop(); 
}