#include <Arduino.h>
#include <stdlib.h> // Library untuk acak

const int numLEDs = 8; // Jumlah LED
const int buttonPin = 2; // Pin tombol tekan (opsional)

int LEDpins[] = {3, 4, 5, 6, 7, 8, 9, 10}; // Pin LED
int LEDs[numLEDs]; // Array untuk menyimpan status LED (1 = menyala, 0 = mati)
int matchedPairs = 0; // Jumlah pasangan yang sudah ditemukan
int firstLED = -1; // LED pertama yang dipilih
int secondLED = -1; // LED kedua yang dipilih
boolean gameActive = true; // Status permainan (true = sedang berjalan, false = selesai)

void setup() {
  randomSeed(analogRead(0)); // Inisialisasi generator bilangan acak
  for (int i = 0; i < numLEDs; i++) {
    pinMode(LEDpins[i], OUTPUT);
    digitalWrite(LEDpins[i], LOW);
  }
  pinMode(buttonPin, INPUT_PULLUP);
  startGame();
}

void loop() {
  if (gameActive) {
    int buttonState = digitalRead(buttonPin);
    if (buttonState == LOW) { // Tombol ditekan
      int selectedLED = getSelectedLED();
      if (selectedLED != -1) {
        toggleLED(selectedLED);
        if (firstLED == -1) {
          firstLED = selectedLED;
        } else {
          secondLED = selectedLED;
          if (LEDs[firstLED] == LEDs[secondLED]) {
            matchedPairs++;
            if (matchedPairs == numLEDs / 2) {
              gameActive = false;
              // Permainan selesai
            }
          } else {
            delay(500); // Tahan LED yang dinyalakan selama 1 detik
            toggleLED(firstLED);
            toggleLED(secondLED);
          }
          firstLED = -1;
          secondLED = -1;
        }
      }
    }
  }
}

void startGame() {
  for (int i = 0; i < numLEDs; i++) {
    LEDs[i] = i / 2; // Setiap pasangan LED memiliki nomor yang sama
  }
  shuffleLEDs();
  for (int i = 0; i < numLEDs; i++) {
    toggleLED(i);
    delay(500);
    toggleLED(i);
    delay(500);
  }
}

void shuffleLEDs() {
  for (int i = numLEDs - 1; i > 0; i--) {
    int j = random(i + 1);
    if (i != j) {
      // Tukar posisi LED
      int temp = LEDs[i];
      LEDs[i] = LEDs[j];
      LEDs[j] = temp;
    }
  }
}

void toggleLED(int ledIndex) {
  if (LEDs[ledIndex] == -1) return;
  digitalWrite(LEDpins[ledIndex], LEDs[ledIndex] == 1 ? HIGH : LOW);
}

int getSelectedLED() {
  for (int i = 0; i < numLEDs; i++) {
    if (digitalRead(LEDpins[i]) == LOW) {
      if (LEDs[i] == -1) {
        return -1;
      } else {
        return i;
      }
    }
  }
  return -1;
}