// Pin definitions
const int upButtonPin = 2;        // Pin for counting up
const int downButtonPin = 3;      // Pin for counting down
const int ledPins[] = {9, 10, 11}; // Pins for the LEDs (3-bit counter)

int counter = 0;                  // 3-bit counter value (0 to 7)
const int maxCounter = 7;         // Maximum value for 3-bit counter
const int minCounter = 0;         // Minimum value for 3-bit counter

unsigned long lastDebounceTimeUp = 0;    // Last debounce time for up button
unsigned long lastDebounceTimeDown = 0;  // Last debounce time for down button
unsigned long debounceDelay = 500;        // Debounce delay time

int lastUpButtonState = HIGH;     // Previous up button state
int lastDownButtonState = HIGH;   // Previous down button state

void setup() {
  // Set the button pins as input pull-up
  pinMode(upButtonPin, INPUT);
  pinMode(downButtonPin, INPUT);

  // Set the LED pins as output
  for (int i = 0; i < 3; i++) {
    pinMode(ledPins[i], OUTPUT);
  }

  // Initialize LEDs with the initial counter value
  updateLEDs(counter);
}

void loop() {
  int upButtonState = digitalRead(upButtonPin);       // Read the state of the up button
  int downButtonState = digitalRead(downButtonPin);   // Read the state of the down button

  unsigned long currentTime = millis();

  // Debouncing for up button
  if (upButtonState == LOW && (currentTime - lastDebounceTimeUp > debounceDelay)) {
    if (lastUpButtonState == HIGH) { // Button press detected
      if (counter < maxCounter) {     // Increment if counter is less than 7
        counter++;
      }
      updateLEDs(counter);            // Update the LEDs with the new counter value
      lastDebounceTimeUp = currentTime;
    }
  }
  lastUpButtonState = upButtonState;

  // Debouncing for down button
  if (downButtonState == LOW && (currentTime - lastDebounceTimeDown > debounceDelay)) {
    if (lastDownButtonState == HIGH) { // Button press detected
      if (counter > minCounter) {      // Decrement if counter is greater than 0
        counter--;
      }
      updateLEDs(counter);             // Update the LEDs with the new counter value
      lastDebounceTimeDown = currentTime;
    }
  }
  lastDownButtonState = downButtonState;
}

// Function to update LEDs based on the counter value
void updateLEDs(int value) {
  for (int i = 0; i < 3; i++) {
    digitalWrite(ledPins[i], (value >> i) & 1);  // Extract each bit and set the corresponding LED
  }
}