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

// Define keypad and LCD connections
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] = {19, 18, 5, 17};  // Adjust pin numbers as needed
byte colPins[COLS] = {16, 4, 0, 2};
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
LiquidCrystal_I2C lcd(0x27, 16, 2);  // Set I2C address of LCD

//Deine door lock pin and buzzer
#define doorLock 25
#define buzzer 26

// Define password
const char password[] = "1234";  // Set your password
char enteredPassword[5] = "";
byte currentPosition = 0;

void setup() {
  
  
  // Initialize LCD
  lcd.init();
  lcd.backlight();            // Turn on backlight
  lcd.clear();                // Clear display
  lcd.setCursor(0, 0);
  lcd.print("Connected, IP: ");
  lcd.setCursor(0, 1);
  lcd.println("192.168.12.01");
  delay(5000);
  lcd.clear();
  lcd.setCursor(1, 0);         // Set cursor to first line, first column
  lcd.print("Enter Password ");
  lcd.setCursor(0, 1);
  lcd.print("Or Scan The Cart");
  pinMode(doorLock, OUTPUT);
  pinMode(buzzer, OUTPUT);
}

void loop() {
  cmpPassword();
}

void cmpPassword() {
  char key = keypad.getKey();
  if (key) {
    if (key == '*' || key == '#') {
      currentPosition = 0;
      lcd.clear();
      lcd.print("Enter Password:");
    } else {
      enteredPassword[currentPosition++] = key;
      enteredPassword[currentPosition] = '\0';
      lcd.setCursor(currentPosition + 6, 1);
      lcd.print("*");
    }

    if (currentPosition == 4) {
      if (strcmp(enteredPassword, password) == 0) {
        lcd.clear();
        lcd.print("Access Granted!");
        digitalWrite(doorLock, HIGH);  // Unlock door
        delay(3000);  // Keep door unlocked for 3 seconds
        digitalWrite(doorLock, LOW);  // Relock door
        lcd.clear();
        lcd.print("taype Password ");
        lcd.setCursor(0, 1);
        lcd.print("Or Scan The Cart");
        currentPosition = 0;
      } else {
        lcd.clear();
        lcd.print("Incorrect Password");
        digitalWrite(buzzer, HIGH);
        delay(2000);
        digitalWrite(buzzer, LOW);
        lcd.clear();
        lcd.print("taype Password ");
        lcd.setCursor(0, 1);
        lcd.print("Or Scan The Cart");
        currentPosition = 0;
      }
    }
  }
}