#define BUTTON_PIN        2
#define RESET_BUTTON_PIN  3

#define LED_PIN_3        6
#define LED_PIN_2        7
#define LED_PIN_1        8
#define LED_PIN_0        9

// Verbesserte Entprell-Logik
volatile unsigned long lastInterruptTime = 0;
const unsigned long DEBOUNCE_TIME = 150; // Höherer Wert für bessere Entprellung
volatile bool flagSet = false;

void setup() {
  Serial.begin(9600);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  pinMode(RESET_BUTTON_PIN, INPUT_PULLUP);
  
  pinMode(LED_PIN_0, OUTPUT);
  pinMode(LED_PIN_1, OUTPUT);
  pinMode(LED_PIN_2, OUTPUT);
  pinMode(LED_PIN_3, OUTPUT);
  
  updateLEDs(0);
  attachInterrupt(digitalPinToInterrupt(BUTTON_PIN), inkrementISR, FALLING);
}

// Korrigierte ISR mit verbesserter Entprellung
void inkrementISR() {
  unsigned long currentTime = millis();
  
  // Nur wenn genug Zeit seit letztem Ereignis vergangen ist
  if (currentTime - lastInterruptTime >= DEBOUNCE_TIME) {
    flagSet = true;
    lastInterruptTime = currentTime;
  }
}

void updateLEDs(uint8_t value) {
  digitalWrite(LED_PIN_0, value & 0x01);
  digitalWrite(LED_PIN_1, value & 0x02);
  digitalWrite(LED_PIN_2, value & 0x04);
  digitalWrite(LED_PIN_3, value & 0x08);
}

// Entprellung für Reset-Taster
bool entprellen(bool &previousState, unsigned long &lastDebounceTime, int pin) {
  bool currentState = digitalRead(pin);
  unsigned long currentTime = millis();
  
  if (currentState != previousState && (currentTime - lastDebounceTime >= 50)) {
    lastDebounceTime = currentTime;
    bool pressed = (currentState == LOW && previousState == HIGH);
    previousState = currentState;
    return pressed;
  }
  return false;
}

void loop() {
  static uint8_t countValue = 0;
  static bool previousResetState = HIGH;
  static unsigned long lastDebounceTimeReset = 0;

 if (flagSet) {
  flagSet = false;
  
  // Warte bis Prellen vorbei ist
  unsigned long start = millis();
  while (millis() - start < 50) {
    // Warte aktiv bis 50ms vergangen sind
  }
  
  if (digitalRead(BUTTON_PIN) == LOW) {
    countValue = (countValue + 1) % 16;
    Serial.print("Zählwert: ");
    Serial.println(countValue);
    updateLEDs(countValue);
  }
}

  // 2. Reset-Taster verarbeiten
  if (entprellen(previousResetState, lastDebounceTimeReset, RESET_BUTTON_PIN)) {
    countValue = 0;
    Serial.println("Zähler zurückgesetzt auf 0");
    updateLEDs(countValue);
  }
}