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

// === KONFIGURASI LCD (Alamat I2C bisa 0x27 atau 0x3F) ===
LiquidCrystal_I2C lcd(0x27, 16, 2);

// === KONFIGURASI KEYPAD 4x4 ===
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] = {13, 12, 14, 27}; // Sesuaikan dengan pin ESP32
byte colPins[COLS] = {26, 25, 33, 32};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

// === PASSWORD YANG DIGUNAKAN (NIM) ===
String inputPassword = "";
String storedPassword = "23024088";  // Ganti dengan NIM yang diinginkan

void setup() {
  Serial.begin(115200);

  // Inisialisasi LCD
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Masukkan NIM:");
}

void loop() {
  char key = keypad.getKey();

  if (key) {
    Serial.print(key);

    if (key == '#') {  // Jika tombol "#" ditekan, verifikasi password
      lcd.clear();
      lcd.setCursor(0, 0);

      if (inputPassword == storedPassword) {
        lcd.print("Akses Diterima");
        Serial.println("Akses Diterima");
      } else {
        lcd.print("Salah! Coba Lagi");
        Serial.println("Akses Ditolak");
      }

      delay(2000);
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Masukkan NIM:");
      inputPassword = "";  // Reset input password

    } else if (key == '*') {  // Jika "*" ditekan, hapus input
      inputPassword = "";
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Masukkan NIM:");

    } else {  // Tambahkan karakter ke input password
      if (inputPassword.length() < 8) {  // Maksimal 8 digit NIM
        inputPassword += key;
        lcd.setCursor(0, 1);
        lcd.print(inputPassword);
      }
    }
  }
}