const int buttonPin = 21;
const int ledPin = 19;

int counter = 0;
int randomNumber = 0;

// Debounce promenljive
unsigned long pressStartTime = 0;
bool buttonPressed = false;      // da li je taster trenutno pritisnut (ignorišemo buncanje)
bool pressProcessed = false;     // da li smo već obradili ovaj pritisak
const unsigned long debounceDelay = 50;   // koliko ms mora biti stabilan LOW da bi se prihvatio pritisak

bool ledActive = false;
unsigned long ledStartTime = 0;
const unsigned long ledDuration = 10000;

void setup() {
  Serial.begin(115200);
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(ledPin, OUTPUT);

  randomSeed(esp_random());
  randomNumber = random(1, 11);

  Serial.println("=== SISTEM STARTOVAN ===");
  Serial.print("Random broj: ");
  Serial.println(randomNumber);
  Serial.println("========================");
}

void loop() {
  bool current = digitalRead(buttonPin);

  // --- Debounce logika ---
  if (current == LOW && !buttonPressed) {
    // Taster je upravo prešao u LOW – počinjemo merenje vremena
    pressStartTime = millis();
    buttonPressed = true;
    pressProcessed = false;
  }

  if (buttonPressed && !pressProcessed && (millis() - pressStartTime >= debounceDelay)) {
    // Taster je stabilno pritisnut dovoljno dugo – prihvatamo pritisak
    pressProcessed = true;

    if (!ledActive) {
      counter++;
      Serial.print("Broj PRITISAKA: ");
      Serial.println(counter);

      if (counter == randomNumber) {
        Serial.println("=== POGODAK! LED pali 10 sekundi ===");
        digitalWrite(ledPin, HIGH);
        ledActive = true;
        ledStartTime = millis();
      }
    } else {
      Serial.println("LED je upaljen, pritisak se ne računa.");
    }
  }

  if (current == HIGH && buttonPressed) {
    // Taster je pušten – resetujemo stanje za sledeći pritisak
    buttonPressed = false;
    pressProcessed = false;
  }

  // --- Upravljanje LED (neblokirajuće) ---
  if (ledActive && (millis() - ledStartTime >= ledDuration)) {
    digitalWrite(ledPin, LOW);
    ledActive = false;
    counter = 0;
    randomNumber = random(1, 11);
    Serial.println("=== RESET SISTEMA ===");
    Serial.print("Novi random broj: ");
    Serial.println(randomNumber);
    Serial.println("======================");
  }
}