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

char clientId[50] = "ESP32_Client";
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 loop() {
  if (!client.connected()) {
    mqttReconnect();
  }
  client.loop();
}

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

void callback(char* topic, byte* payload, unsigned int length) {
  String stMessage = "";
  for (int i = 0; i < length; i++) {
    stMessage += (char)payload[i];
  }
  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");
  }
}