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

// WiFi credentials
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// MQTT broker HiveMQ
const char* mqtt_server = "broker.hivemq.com";

// Client ID unik (biar ga bentrok)
const char* MQTT_client_id = "LIVEDEMO_ITC239292e4neknej";

const char* MQTT_username = "";
const char* MQTT_password = "";

// Inisialisasi client
WiFiClient espClient;
PubSubClient client(espClient);

// Pin LED (bisa kamu sesuaikan di Wokwi)
#define RED_LED 4
#define GREEN_LED 0
#define BLUE_LED 2
#define ORANGE_LED 15

void setup_wifi() {
  Serial.begin(115200);
  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  
  Serial.println("\nWiFi connected!");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());
}

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

  Serial.printf("Topic: %s | Message: %s\n", topic, message.c_str());

  // Kendalikan LED berdasarkan topik
  if (String(topic) == "lights/red") digitalWrite(RED_LED, message == "on");
  if (String(topic) == "lights/green") digitalWrite(GREEN_LED, message == "on");
  if (String(topic) == "lights/blue") digitalWrite(BLUE_LED, message == "on");
  if (String(topic) == "lights/orange") digitalWrite(ORANGE_LED, message == "on");
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Connecting to MQTT...");
    if (client.connect(MQTT_client_id, MQTT_username, MQTT_password)) {
      Serial.println("connected!");
      client.subscribe("lights/red");
      client.subscribe("lights/green");
      client.subscribe("lights/blue");
      client.subscribe("lights/orange");
      Serial.println("Subscribed to topics!");
    } else {
      Serial.print("Failed, rc=");
      Serial.print(client.state());
      Serial.println(" retrying in 5 seconds...");
      delay(5000);
    }
  }
}

void setup() {
  pinMode(RED_LED, OUTPUT);
  pinMode(GREEN_LED, OUTPUT);
  pinMode(BLUE_LED, OUTPUT);
  pinMode(ORANGE_LED, OUTPUT);
  
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

void loop() {
  if (!client.connected()) reconnect();
  client.loop();
}