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

LiquidCrystal_I2C lcd(0x27, 16, 2);

const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
    {'4','5','6','B'},
      {'7','8','9','C'},
        {'*','0','#','D'}
        };
        byte rowPins[ROWS] = {9, 8, 7, 6}; 
        byte colPins[COLS] = {5, 4, 3, 2}; 
        Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

        const int buzzer = 10;

        int score = 0, totalSoal = 10;
        int benar = 0, salah = 0, kosong = 0;
        int level = 1, topScore = 0;

        void setup() {
          lcd.init();
            lcd.backlight();
              pinMode(buzzer, OUTPUT);
                randomSeed(analogRead(0));
                  EEPROM.get(0, topScore);
                    if(topScore < 0) topScore = 0; 
                      tampilkanMenu();
                      }

                      void loop() {
                        char key = keypad.getKey();
                          if (key) {
                              tone(buzzer, 1000, 50); 
                                  if (key >= '1' && key <= '3') {
                                        level = key - '0';
                                              mulaiGame();
                                                  }
                                                    }
                                                    }

                                                    void tampilkanMenu() {
                                                      lcd.clear();
                                                        lcd.noCursor();
                                                          lcd.setCursor(0,0);
                                                            lcd.print("Level: Tekan 1-3");
                                                              lcd.setCursor(0,1);
                                                                lcd.print("Top Score: ");
                                                                  lcd.print(topScore);
                                                                  }

                                                                  void mulaiGame() {
                                                                    score = 0; benar = 0; salah = 0; kosong = 0;
                                                                      lcd.clear();
                                                                        lcd.print("Apa kamu siap?");
                                                                          delay(1000); // Delay di luar loop permainan masih aman
                                                                            
                                                                              for (int i = 3; i > 0; i--) {
                                                                                  lcd.clear();
                                                                                      lcd.setCursor(7,0);
                                                                                          lcd.print(i);
                                                                                              tone(buzzer, 1200, 100);
                                                                                                  delay(1000);
                                                                                                    }

                                                                                                      for (int soalKe = 1; soalKe <= totalSoal; soalKe++) {
                                                                                                          mainkanSoal(soalKe);
                                                                                                            }
                                                                                                              selesaiGame();
                                                                                                              }

                                                                                                              void mainkanSoal(int nomor) {
                                                                                                                int a = random(1, 10);
                                                                                                                  int b;
                                                                                                                    if (level == 1) b = random(1, 5);
                                                                                                                      else if (level == 2) b = random(1, 8);
                                                                                                                        else b = random(1, 10);

                                                                                                                          int jawabanBenar = a * b;
                                                                                                                            String inputUser = "";
                                                                                                                              
                                                                                                                                lcd.clear();
                                                                                                                                  lcd.print("Soal "); lcd.print(nomor);
                                                                                                                                    lcd.setCursor(0,1);
                                                                                                                                      lcd.print(a); lcd.print(" x "); lcd.print(b); lcd.print(" = ");
                                                                                                                                        
                                                                                                                                          int startX = (String(a).length() + String(b).length() + 6);
                                                                                                                                            lcd.setCursor(startX, 1);
                                                                                                                                              lcd.cursor();

                                                                                                                                                unsigned long startTime = millis();
                                                                                                                                                  unsigned long timerSatuDetik = 0;
                                                                                                                                                    bool answered = false;

                                                                                                                                                      // LOOP INI HARUS SANGAT CEPAT
                                                                                                                                                        while (millis() - startTime < 3000) {
                                                                                                                                                            char key = keypad.getKey(); // Dibaca terus menerus tanpa delay
                                                                                                                                                                
                                                                                                                                                                    // Update timer di layar setiap 1 detik tanpa menghentikan loop
                                                                                                                                                                        if (millis() - timerSatuDetik >= 100) { 
                                                                                                                                                                              lcd.setCursor(15, 0);
                                                                                                                                                                                    lcd.print(3 - ((millis() - startTime) / 1000));
                                                                                                                                                                                          lcd.setCursor(startX + inputUser.length(), 1);
                                                                                                                                                                                                timerSatuDetik = millis();
                                                                                                                                                                                                    }

                                                                                                                                                                                                        if (key) {
                                                                                                                                                                                                              tone(buzzer, 1000, 50); // Beep singkat (non-blocking tone)
                                                                                                                                                                                                                    if (key >= '0' && key <= '9') {
                                                                                                                                                                                                                            inputUser += key;
                                                                                                                                                                                                                                    lcd.print(key);
                                                                                                                                                                                                                                          } 
                                                                                                                                                                                                                                                else if (key == '*') {
                                                                                                                                                                                                                                                        if (inputUser.length() > 0) {
                                                                                                                                                                                                                                                                  inputUser.remove(inputUser.length() - 1);
                                                                                                                                                                                                                                                                            lcd.setCursor(startX, 1);
                                                                                                                                                                                                                                                                                      lcd.print("    "); 
                                                                                                                                                                                                                                                                                                lcd.setCursor(startX, 1);
                                                                                                                                                                                                                                                                                                          lcd.print(inputUser);
                                                                                                                                                                                                                                                                                                                  }
                                                                                                                                                                                                                                                                                                                        }
                                                                                                                                                                                                                                                                                                                              else if (key == '#') {
                                                                                                                                                                                                                                                                                                                                      answered = true;
                                                                                                                                                                                                                                                                                                                                              break;
                                                                                                                                                                                                                                                                                                                                                    }
                                                                                                                                                                                                                                                                                                                                                        }
                                                                                                                                                                                                                                                                                                                                                          }

                                                                                                                                                                                                                                                                                                                                                            lcd.noCursor();
                                                                                                                                                                                                                                                                                                                                                              lcd.clear();

                                                                                                                                                                                                                                                                                                                                                                if (inputUser == "") {
                                                                                                                                                                                                                                                                                                                                                                    score -= 3; kosong++;
                                                                                                                                                                                                                                                                                                                                                                        lcd.print("WAKTU HABIS!");
                                                                                                                                                                                                                                                                                                                                                                            tone(buzzer, 400, 500);
                                                                                                                                                                                                                                                                                                                                                                              } else {
                                                                                                                                                                                                                                                                                                                                                                                  if (inputUser.toInt() == jawabanBenar) {
                                                                                                                                                                                                                                                                                                                                                                                        score += 1; benar++;
                                                                                                                                                                                                                                                                                                                                                                                              lcd.print("BENAR! (+1)");
                                                                                                                                                                                                                                                                                                                                                                                                    tone(buzzer, 1500, 100); delay(100); tone(buzzer, 2000, 100);
                                                                                                                                                                                                                                                                                                                                                                                                        } else {
                                                                                                                                                                                                                                                                                                                                                                                                              score -= 1; salah++;
                                                                                                                                                                                                                                                                                                                                                                                                                    lcd.print("SALAH! Jwb:"); lcd.print(jawabanBenar);
                                                                                                                                                                                                                                                                                                                                                                                                                          tone(buzzer, 300, 400);
                                                                                                                                                                                                                                                                                                                                                                                                                              }
                                                                                                                                                                                                                                                                                                                                                                                                                                }
                                                                                                                                                                                                                                                                                                                                                                                                                                  delay(1000); // Jeda singkat setelah jawaban muncul
                                                                                                                                                                                                                                                                                                                                                                                                                                  }

                                                                                                                                                                                                                                                                                                                                                                                                                                  void selesaiGame() {
                                                                                                                                                                                                                                                                                                                                                                                                                                    lcd.clear();
                                                                                                                                                                                                                                                                                                                                                                                                                                      lcd.print("Game Selesai!");
                                                                                                                                                                                                                                                                                                                                                                                                                                        delay(2000);
                                                                                                                                                                                                                                                                                                                                                                                                                                          lcd.clear();
                                                                                                                                                                                                                                                                                                                                                                                                                                            lcd.setCursor(0,0);
                                                                                                                                                                                                                                                                                                                                                                                                                                              lcd.print("B:"); lcd.print(benar);
                                                                                                                                                                                                                                                                                                                                                                                                                                                lcd.print(" S:"); lcd.print(salah);
                                                                                                                                                                                                                                                                                                                                                                                                                                                  lcd.print(" K:"); lcd.print(kosong);
                                                                                                                                                                                                                                                                                                                                                                                                                                                    lcd.setCursor(0,1);
                                                                                                                                                                                                                                                                                                                                                                                                                                                      lcd.print("Score: "); lcd.print(score);

                                                                                                                                                                                                                                                                                                                                                                                                                                                        if (score > topScore) {
                                                                                                                                                                                                                                                                                                                                                                                                                                                            topScore = score;
                                                                                                                                                                                                                                                                                                                                                                                                                                                                EEPROM.put(0, topScore);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    delay(1000);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        lcd.setCursor(0,0);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            lcd.print("NEW TOP SCORE!  ");
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                tone(buzzer, 1000, 500);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  }
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    delay(4000);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      tampilkanMenu();
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      }