const int buttonPin = 2;
const int buzzerPins[3] = {3, 4, 5};
const int frequencies[3] = {440, 660, 880}; // A4, E5, A5

unsigned long pressStartTime;
bool isPressed = false;

void setup() {
  pinMode(buttonPin, INPUT);
  for (int i = 0; i < 3; i++) {
    pinMode(buzzerPins[i], OUTPUT);
  }
}

void loop() {
  int buttonState = digitalRead(buttonPin);

  if (buttonState == HIGH && !isPressed) {
    isPressed = true;
    pressStartTime = millis();
  }

  if (buttonState == LOW && isPressed) {
    isPressed = false;
    unsigned long pressDuration = (millis() - pressStartTime) / 1000;
    if (pressDuration >= 1) {
      unsigned long baseTime = 5;
      unsigned long extraTime = (pressDuration > baseTime) ? pressDuration - baseTime : 0;
      unsigned long totalPlayTime = baseTime + extraTime;

      playBuzzers(totalPlayTime);
    }
  }
}

void playBuzzers(unsigned long seconds) {
  unsigned long endTime = millis() + seconds * 1000;

  while (millis() < endTime) {
    for (int i = 0; i < 3; i++) {
      tone(buzzerPins[i], frequencies[i]);
      delay(200);
      noTone(buzzerPins[i]);
    }

    // change the order each cycle
    int temp = frequencies[0];
    frequencies[0] = frequencies[1];
    frequencies[1] = frequencies[2];
    frequencies[2] = temp;
  }
}