const int buttonPin = PA0; 
const int ledPin = PB6;      

int ledState = LOW;            
int brightness = 0;           
bool directionUp = true;      
bool longPressActive = false; 

unsigned long pressStartTime = 0;
const int shortPressTime = 500;  
const int longPressTime = 1000;  

void setup() {
  pinMode(buttonPin, INPUT_PULLUP); 
  pinMode(ledPin, OUTPUT);
  
  analogWrite(ledPin, 0);
}

void loop() {
  if (digitalRead(buttonPin) == LOW) {
   
    if (pressStartTime == 0) {
      pressStartTime = millis();
    }
    
    unsigned long pressDuration = millis() - pressStartTime;
    
    if (pressDuration > longPressTime) {
      longPressActive = true;
      
      if (directionUp) {
        brightness = min(255, brightness + 1);
      } else {
        brightness = max(0, brightness - 1);
      }
    
      if (ledState == HIGH) {
        analogWrite(ledPin, brightness);
      }
    
      delay(10);
    }
    
  } else {
    
    if (pressStartTime != 0) {
      unsigned long pressDuration = millis() - pressStartTime;

      if (pressDuration < shortPressTime) {
        ledState = !ledState;
        
        if (ledState == HIGH) {
          analogWrite(ledPin, brightness);
        } else {
          analogWrite(ledPin, 0);
        }
      }
  
      if (pressDuration >= longPressTime) {
        directionUp = !directionUp;
      }
      pressStartTime = 0;
      longPressActive = false;
    }
  }
}