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

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

// MQTT broker shiftr.io
const char* mqtt_server = "pings-112.cloud.shiftr.io";
const int   mqtt_port   = 1883;
const char* mqtt_user   = "pings-112";
const char* mqtt_pass   = "pinsss";   // ganti sesuai password kamu
const char* topic_ledcontrol = "esp32/ledcontrol"; 
const char* topic_status     = "esp32/status";    // ✅ topik status device

// Pin
#define BUTTON_PIN 4
#define LED_PIN    2   

WiFiClient espClient;
PubSubClient client(espClient);

void setup_wifi() {
  delay(10);
  Serial.println("Menghubungkan ke WiFi...");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi terhubung!");
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Menghubungkan ke MQTT...");
    String clientId = "ESP32Client-" + String(random(0xffff), HEX);
    // ✅ connect dengan user & pass
    if (client.connect(clientId.c_str(), mqtt_user, mqtt_pass)) {
      Serial.println("Terhubung ke broker MQTT.");
      client.publish(topic_status, "online", true);   // kirim status online
    } else {
      Serial.print("Gagal, rc=");
      Serial.print(client.state());
      delay(2000);
    }
  }
}

void setup() {
  Serial.begin(115200);
  pinMode(BUTTON_PIN, INPUT_PULLUP); 
  pinMode(LED_PIN, OUTPUT);

  setup_wifi();
  client.setServer(mqtt_server, mqtt_port);

  // ✅ setWill → pesan otomatis jika disconnect mendadak
  client.setWill(topic_status, "offline", true, 0);
}

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

  int buttonState = digitalRead(BUTTON_PIN);

  if (buttonState == LOW) { 
    digitalWrite(LED_PIN, HIGH);
    client.publish(topic_ledcontrol, "ON");
    Serial.println("Tombol ditekan → Lampu ON");
  } else {
    digitalWrite(LED_PIN, LOW);
    client.publish(topic_ledcontrol, "OFF");
    Serial.println("Tombol dilepas → Lampu OFF");
  }

  delay(2000); 
}