const int BUTTON_PIN = PA0;
const int LED_PIN = PB6;


bool ledEnabled = false;
int brightness = 128; 
bool directionUp = true;

unsigned long lastDebounceTime = 0;
const unsigned long DEBOUNCE_DELAY = 50;
int lastButtonState = HIGH;
int buttonState = HIGH;

void setup() {
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);  
 
  analogWrite(LED_PIN, ledEnabled ? brightness : 0);
  Serial.begin(9600);
  Serial.println("Система запущена. Управляйте яркостью!");
}

void loop() {
  int reading = digitalRead(BUTTON_PIN);
  
  if (reading != lastButtonState) {
    lastDebounceTime = millis();
  }
  
  if ((millis() - lastDebounceTime) > DEBOUNCE_DELAY) {
    if (reading != buttonState) {
      buttonState = reading;
      
      if (buttonState == LOW) {
        unsigned long pressStart = millis();
        
        // Ждем отпускания кнопки
        while (digitalRead(BUTTON_PIN) == LOW) {
          delay(10);
        }
        
        
        unsigned long pressDuration = millis() - pressStart;
        
        if (pressDuration < 500) {
          ledEnabled = !ledEnabled;
          if (ledEnabled) {
            analogWrite(LED_PIN, brightness);
            Serial.println("LED включен");
          } else {
            analogWrite(LED_PIN, 0);
            Serial.println("LED выключен");
          }
        }
        else if (pressDuration > 1000) {
          Serial.print("Меняем яркость ");
          Serial.println(directionUp ? "увеличивая" : "уменьшая");
          
          while (digitalRead(BUTTON_PIN) == LOW) {
            if (directionUp) {
              brightness += 5;
              if (brightness > 255) {
                brightness = 255;
              }
            } else {
              brightness -= 5;
              if (brightness < 0) {
                brightness = 0;
              }
            }
            if (ledEnabled) {
              analogWrite(LED_PIN, brightness);
            }
            delay(30);
          }
          directionUp = !directionUp;
          Serial.print("Яркость установлена: ");
          Serial.println(brightness);
        }
      }
    }
  }
  
  lastButtonState = reading;
}