// Import libraries
#include "WiFi.h"
#include "PubSubClient.h"
#include <FastLED>
// Define variables
char clientId[50];
WiFiClient espClient;
PubSubClient client(espClient);
CRGB leds[1];

void setup(){
  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.connected()) 
  {
    Serial.print("Attempting MQTT connection...");
    if (client.connect(clientId)) 
    {
      Serial.println("Connected");
      client.subscribe("topicName");
    } 
    else 
    {
      Serial.print("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(); 
}