#include <Keypad.h>
#include <LiquidCrystal.h>

// Pin definitions
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] = {A3, A2, A1, A0};
byte colPins[COLS] = {12, 11, 10, 9};
const byte RELAY_PIN = 13;
const byte RS = 2, EN = 3, D4 = 4, D5 = 5, D6 = 6, D7 = 7;

// Initialize objects
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
LiquidCrystal lcd(RS, EN, D4, D5, D6, D7);

// Password
const char* password = "3443";

// Lockout variables
const byte MAX_ATTEMPTS = 5;
const unsigned long LOCKOUT_DURATION = 900000; // 15 minutes in milliseconds
byte attempts = 0;
unsigned long lockoutStart = 0;

void setup() {
  // Initialize LCD
  lcd.begin(16, 2);
  lcd.setCursor(0,0);
  lcd.print("Enter Passcode:");
  
  // Initialize relay
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW);
}

void loop() {
  static String input = "";
  
  // Check for lockout
  if (attempts >= MAX_ATTEMPTS && (millis() - lockoutStart) < LOCKOUT_DURATION) {
    lcd.clear();
    lcd.print("Locked Out");
    return;
  }
  
  // Reset lockout if duration has elapsed
  if (attempts >= MAX_ATTEMPTS && (millis() - lockoutStart) >= LOCKOUT_DURATION) {
    attempts = 0;
    lcd.clear();
    lcd.print("Enter Passcode:");
  }
  
  // Get key from keypad
  char key = keypad.getKey();
  if (key) {
    // Display key on LCD
    lcd.setCursor(input.length(),1);
    lcd.print(key);
    
    // Add key to input
    input += key;
  }
  
  // Check if passcode entered
  if (input.length() == strlen(password)) {
    // Compare input to password
    if (input == password) {
      attempts = 0;
      lcd.clear();
      lcd.print("Toegang verleend");
      digitalWrite(RELAY_PIN, HIGH); // Activate relay
      delay(10000); // Wait 10 seconds
      digitalWrite(RELAY_PIN, LOW); // Deactivate relay
      lcd.clear();
      lcd.print("Enter Passcode:");
    } else {
      attempts++;
      if (attempts < MAX_ATTEMPTS) {
        lcd.clear();
        lcd.print("Geen Toegang");
        delay(1000);
        lcd.clear();
        lcd.print("Enter Passcode:");
      } else {
        lockoutStart = millis();
        lcd.clear();
        lcd.print("Locked Out");
      }
    }
    
    // Reset input
    input = "";
  }
}