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

// Initialize the LCD (pins 12, 5, 4, 3, 2, 1)
LiquidCrystal lcd(12, 5, 4, 3, 2, 1);

// Set the correct code
const String correctCode = "1234"; 

// Define bulb pin
const int bulbPin = 13;

// Keypad configuration
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] = {A0, A1, 11, 10};
byte colPins[COLS] = {9, 8, 7, 6};

// Initialize keypad
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

String enteredCode = ""; // Store entered code
int attempts = 0;        // Count failed attempts

void setup() {
  pinMode(bulbPin, OUTPUT);
  digitalWrite(bulbPin, LOW); // Ensure bulb is off initially
  lcd.begin(16, 2);
  lcd.print("Enter Code:");
}

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

  if (key) {
    // Clear the LCD before showing the key
    lcd.clear();
    
    // Handle special keys
    if (key == '#') {
      // Check if entered code matches
      if (enteredCode == correctCode) {
        lcd.print("Access Granted");
        digitalWrite(bulbPin, HIGH); // Turn on bulb
        delay(5000); // Keep bulb on for 5 seconds
        digitalWrite(bulbPin, LOW); // Turn off bulb
        enteredCode = ""; // Reset the entered code
        attempts = 0; // Reset the attempts
        lcd.clear();
        lcd.print("Enter Code:");
      } else {
        // Wrong code entered
        attempts++;
        lcd.print("Access Denied");
        if (attempts >= 3) {
          // Lock system after 3 attempts
          lcd.clear();
          lcd.print("System Locked");
          while (true); // Halt the program indefinitely
        } else {
          delay(2000);
          lcd.clear();
          lcd.print("Try Again:");
        }
        enteredCode = ""; // Reset the entered code
      }
    } else if (key == '*') {
      // Clear the entered code
      enteredCode = "";
      lcd.print("Cleared");
      delay(2000);
      lcd.clear();
      lcd.print("Enter Code:");
    } else {
      // Append the entered key to the code
      enteredCode += key;
      lcd.print(enteredCode);
    }
  }
}