#include <Wire.h>
#include <LiquidCrystal_I2C.h>

const int ledPin = 13;
const int buttonPin = 12;

unsigned long startTime;
unsigned long reactionTime;
bool gameStarted = false;

LiquidCrystal_I2C lcd(0x27, 16, 2); // Ganti 0x27 jika alamat I2C berbeda

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT); // Ganti jadi INPUT biasa

  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Reaction Timer!");
  delay(2000);
  lcd.clear();
  
  randomSeed(analogRead(0));
}

void loop() {
  if (!gameStarted) {
    lcd.setCursor(0, 0);
    lcd.print("Tunggu LED...");
    int delayTime = random(2000, 5000);
    delay(delayTime);
    digitalWrite(ledPin, HIGH);
    startTime = millis();
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Tekan tombol!");
    gameStarted = true;
  }

  // Ubah logika jadi tombol ditekan saat HIGH
  if (gameStarted && digitalRead(buttonPin) == HIGH) {
    reactionTime = millis() - startTime;
    digitalWrite(ledPin, LOW);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Waktu reaksi:");
    lcd.setCursor(0, 1);
    lcd.print(reactionTime);
    lcd.print(" ms");
    gameStarted = false;

    // Tunggu sampai tombol dilepas
    while (digitalRead(buttonPin) == HIGH) {
      delay(10); // Debounce
    }

    delay(2000);
    lcd.clear();
  }
}