#define BLYNK_TEMPLATE_ID "TMPL6h_rt1T8z"
#define BLYNK_TEMPLATE_NAME "AMALI 4"
#define BLYNK_AUTH_TOKEN "xp8mUElg7TfHTrxWB8GvcT1QNXtv7-Jn"

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <TM1637Display.h>
#include <Preferences.h> // For saving data to flash memory

// Pin Definitions
#define CLK 13
#define DIO 14
#define BUZZER 12

TM1637Display display(CLK, DIO);
Preferences preferences; 
BlynkTimer timer;

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

int queueNumber = 0;
int buzzerTimerID;

// ---------- SMART UPDATES ----------
void notifyChange() {
  // 1. Update Physical Display
  display.showNumberDec(queueNumber);

  // 2. Update Blynk Dashboard
  Blynk.virtualWrite(V0, queueNumber);
  Blynk.virtualWrite(V3, String(queueNumber));

  // 3. Save to Flash Memory (Persistent)
  preferences.putInt("num", queueNumber);

  // 4. Non-blocking Buzzer
  digitalWrite(BUZZER, HIGH);
  timer.setTimeout(150L, []() {
    digitalWrite(BUZZER, LOW);
  });

  Serial.printf("Queue Updated: %d\n", queueNumber);
}

// ---------- BLYNK HANDLERS ----------

BLYNK_WRITE(V1) { // Increment Button
  if (param.asInt() == 1) {
    queueNumber++;
    notifyChange();
  }
}

BLYNK_WRITE(V2) { // Decrement Button
  if (param.asInt() == 1 && queueNumber > 0) {
    queueNumber--;
    notifyChange();
  }
}

BLYNK_WRITE(V3) { // Manual Input
  queueNumber = param.asInt();
  notifyChange();
}

BLYNK_WRITE(V4) { // Reset Button (New!)
  if (param.asInt() == 1) {
    queueNumber = 0;
    notifyChange();
  }
}

void setup() {
  Serial.begin(115200);
  pinMode(BUZZER, OUTPUT);
  display.setBrightness(0x0f);

  // Load saved number from memory
  preferences.begin("queue-app", false);
  queueNumber = preferences.getInt("num", 0); 
  
  display.showNumberDec(queueNumber);
  Blynk.begin(auth, ssid, pass);
  
  // Sync Blynk dashboard on startup
  Blynk.virtualWrite(V0, queueNumber);
  Blynk.virtualWrite(V3, String(queueNumber));
}

void loop() {
  Blynk.run();
  timer.run(); // Keeps the non-blocking buzzer working
}