const int buttonPin = 27;   // the number of the pushbutton pin
const int ledPins[] = {26, 0, 1};  // Pins for LEDs
int buttonState = 0;         // variable for reading the pushbutton status
bool pressed;

void setup() {
  Serial.begin(9600);
  
  // Initialize LEDs as outputs
  for (int i = 0; i < sizeof(ledPins) / sizeof(ledPins[0]); i++) {
    pinMode(ledPins[i], OUTPUT);
  }

  pinMode(buttonPin, INPUT);
  Serial.println("This is an LED example Board for FAB24");
}

// Function to turn on LEDs one by one
void lightUp(int index) {
  if (index < sizeof(ledPins) / sizeof(ledPins[0])) {
    digitalWrite(ledPins[index], HIGH);
    delay(500); // Adjust delay as needed
    lightUp(index + 1);
  }
}

// Function to turn off LEDs in reverse order
void turnOff(int index) {
  if (index >= 0) {
    digitalWrite(ledPins[index], LOW);
    delay(500); // Adjust delay as needed
    turnOff(index - 1);
  }
}

void regressiveLED() {
  lightUp(0);  // Turn on LEDs one by one
  turnOff(sizeof(ledPins) / sizeof(ledPins[0]) - 1); // Turn off LEDs in reverse order
}

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

  if (buttonState == HIGH) {
    if (pressed == false) {
      Serial.println("Button is pressed");
      pressed = true;

      // Toggle the state of LED 1
      if (digitalRead(ledPins[0]) == LOW) {
        Serial.println("LED is ON");
        digitalWrite(ledPins[0], HIGH);
        regressiveLED(); // Call the function to control LEDs
      } else {
        Serial.println("LED is OFF");
        digitalWrite(ledPins[0], LOW);
        // No need to call regressiveLED() when turning off the LED
      }
    }
  } else {
    pressed = false;
    delay(50);
  }
}