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

#define Password_Lenght 7

LiquidCrystal_I2C lcd(0x27, 16, 2);
char Data[Password_Lenght]; // 6 is the number of chars it can hold + the null char = 7
char Master[Password_Lenght] = "080808";
byte data_count = 0;
bool Pass_is_good;
char customKey;

const byte ROWS = 4;
const byte COLS = 4;

char keys[ROWS][COLS] = {
    {'1', '2', '3', '+'},
    {'4', '5', '6', '-'},
    {'7', '8', '9', '*'},
    {'C', '0', '#', '/'} // '#' acts as Enter key
};

byte rowPins[ROWS] = {9, 8, 7, 6};
byte colPins[COLS] = {5, 4, 3, 2};

Keypad customKeypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS); // initialize an instance of class NewKeypad

// Define LED pins
const int greenLED = 12;
const int redLED = 13;

void setup() {
    lcd.init(); // initialize the lcd
    lcd.backlight();
    pinMode(greenLED, OUTPUT);
    pinMode(redLED, OUTPUT);
    digitalWrite(greenLED, LOW);
    digitalWrite(redLED, LOW);
}

void loop() {
    lcd.setCursor(0, 0);
    lcd.print("Enter Password");
    customKey = customKeypad.getKey();
    
    if (customKey) {
        if (customKey == '#') { // If Enter ('#') is pressed, check the password
            lcd.clear();
            lcd.setCursor(0, 0);
            
            if (!strcmp(Data, Master)) {
                lcd.print("Selamat Datang");
                digitalWrite(greenLED, HIGH); // Turn on green LED
                digitalWrite(redLED, LOW); // Turn off red LED
            } else {
                lcd.print("Password Salah");
                digitalWrite(redLED, HIGH); // Turn on red LED
                digitalWrite(greenLED, LOW); // Turn off green LED
            }
            
            delay(5000); // Wait 5 seconds before resetting
            lcd.clear();
            clearData();
            digitalWrite(greenLED, LOW); // Reset LEDs
            digitalWrite(redLED, LOW);
        } else if (customKey == 'C') { // 'C' clears the input
            lcd.clear();
            clearData();
        } else if (data_count < Password_Lenght - 1) { // Only add if within password limit
            Data[data_count] = customKey;
            lcd.setCursor(data_count, 1);
            lcd.print(Data[data_count]);
            data_count++;
        }
    }
}

void clearData() {
    while (data_count != 0) {
        Data[data_count--] = 0;
    }
    lcd.setCursor(0, 1);
    lcd.print("                "); // Clear the second line on the LCD
    return;
}