const int numLeds = 8;
const int ledPins[] = {6, 7, 8, 9, 10, 11, 12, 13};
const int buttonPins[] = {2, 3, 4, 5};

int ledStates[numLeds];
int buttonStates[4];
int lastButtonStates[4];
int tempo = 100;

enum Richting {
  VOORWAARTS = 1,
  ACHTERWAARTS = -1
};

Richting richting = VOORWAARTS;
bool lichtshow = false;

void setup() {
  for (int i = 0; i < numLeds; i++) {
    pinMode(ledPins[i], OUTPUT);
    ledStates[i] = LOW;  // Initialize each LED state to LOW
  }

  for (int i = 0; i < 4; i++) {
    pinMode(buttonPins[i], INPUT);
    lastButtonStates[i] = HIGH;
  }
}


void toggleAllLeds() {
  lichtshow = !lichtshow; // Toggle the light show state

  while (lichtshow) {
    for (int i = 0; i < numLeds; i++) {
      ledStates[i] = !ledStates[i];
      digitalWrite(ledPins[i], ledStates[i]);
      delay(tempo);
    }

    if (richting == ACHTERWAARTS) {
      for (int i = numLeds - 1; i >= 0; i--) {
        ledStates[i] = !ledStates[i];
        digitalWrite(ledPins[i], ledStates[i]);
        delay(tempo);
      }
    }
  }

  // Turn off all LEDs when light show is stopped
  for (int i = 0; i < numLeds; i++) {
    digitalWrite(ledPins[i], LOW);
  }
}

void versnel() {
  tempo = max(10, tempo - 25);
}

void vertraag() {
  tempo = min(1000, tempo + 25);
}

void veranderRichting() {
  richting = (richting == VOORWAARTS) ? ACHTERWAARTS : VOORWAARTS;
}

void handleButton(int buttonIndex, void (*action)()) {
  int reading = digitalRead(buttonPins[buttonIndex]);
  if (reading != lastButtonStates[buttonIndex]) {
    delay(50); // Debouncing delay
    if (reading != lastButtonStates[buttonIndex]) {
      buttonStates[buttonIndex] = reading;
      action();
    }
  }
  lastButtonStates[buttonIndex] = reading;
}

void loop() {
  handleButton(0, toggleAllLeds);
  handleButton(1, versnel);
  handleButton(2, vertraag);
  handleButton(3, veranderRichting);
}