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

// Konfigurasi LCD I2C
LiquidCrystal_I2C lcd(0x27, 16, 2); // Alamat I2C dan ukuran LCD (16 kolom, 2 baris)

// Konfigurasi keypad
const byte ROWS = 4; // Four rows
const byte COLS = 4; // Four columns
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}; // Connect to the row pins of the keypad
byte colPins[COLS] = {5, 4, 3, 2}; // Connect to the column pins of the keypad
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

// Konfigurasi relay
const int relayPin = 10; // Pin kontrol relay
const unsigned long relayDelay = 5000; // Waktu buka kunci (5 detik)

// Kode kunci
String code = "290804";
String inputCode = "";

// Variabel untuk timing
unsigned long relayStartTime = 0;
bool relayActive = false;

// Setup
void setup() {
  pinMode(relayPin, OUTPUT);
  digitalWrite(relayPin, LOW); // Pastikan relay dalam keadaan off
  lcd.begin(16, 2); // Inisialisasi LCD dengan 16 kolom dan 2 baris
  lcd.backlight(); // Aktifkan backlight jika ada
  lcd.print("Enter Code:");
}

// Loop
void loop() {
  char key = keypad.getKey();
  
  if (key) {
    inputCode += key;
    lcd.setCursor(0, 1);
    lcd.print(inputCode);

    if (inputCode.length() == 6) { // Panjang kode 6 digit
      if (inputCode == code) {
        unlockDoor();
        lcd.clear();
        lcd.print("Access Granted");
        lcd.setCursor(0, 1);
        lcd.print("Door Open");
        relayActive = true;
        relayStartTime = millis(); // Catat waktu saat relay diaktifkan
      } else {
        lcd.clear();
        lcd.print("Access Denied");
      }
      delay(5000); // Tampilkan pesan selama 2 detik
      lcd.clear();
      lcd.print("Enter Code:");
      inputCode = "";
    }
    
    // Reset input jika terlalu panjang
    if (inputCode.length() > 6) {
      inputCode = "";
      lcd.clear();
      lcd.print("Code Too Long");
      delay(2000); // Tampilkan pesan "Code Too Long" selama 2 detik
      lcd.clear();
      lcd.print("Enter Code:");
    }
  }
  
  // Matikan relay jika sudah lebih dari waktu yang ditentukan
  if (relayActive && (millis() - relayStartTime >= relayDelay)) {
    digitalWrite(relayPin, LOW); // Nonaktifkan relay (kunci kembali)
    lcd.clear();
    lcd.print("Enter Code:");
    relayActive = false;
  }
}

// Fungsi untuk membuka pintu
void unlockDoor() {
  digitalWrite(relayPin, HIGH); // Aktifkan relay (buka kunci)
}