#include <Keypad.h>

const byte ROW_NUM    = 4; // four rows
const byte COLUMN_NUM = 4; // four columns

// Define the keypad's keymap
char keys[ROW_NUM][COLUMN_NUM] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};

// Pin assignments for rows and columns (adjust these based on your wiring)
byte pin_rows[ROW_NUM] = {23, 25, 26, 27}; // Row pins (GPIO)
byte pin_column[COLUMN_NUM] = {18, 19, 21, 22}; // Column pins (GPIO)

// Initialize the Keypad library
Keypad keypad = Keypad(makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM);

// Pin assignments for LEDs
const int redLED = 32;  // GPIO for Red LED
const int greenLED = 33; // GPIO for Green LED

// Predefined password
const char correctPassword[] = "12345";  // The correct password
char enteredPassword[5]; // Store the entered password
byte passwordIndex = 0;

void setup() {
  Serial.begin(115200);
  
  // Set LED pins as output
  pinMode(redLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
  
  // Initially turn off both LEDs
  digitalWrite(redLED, LOW);
  digitalWrite(greenLED, LOW);
}

void loop() {
  char key = keypad.getKey();  // Check if a key is pressed

  if (key) {
    if (key == '#') {
      // Check if the entered password matches the correct password
      enteredPassword[passwordIndex] = '\0'; // Null-terminate the entered password string
      if (strcmp(enteredPassword, correctPassword) == 0) {
        Serial.println("Password Correct!");
        digitalWrite(greenLED, HIGH);  // Turn on green LED
        digitalWrite(redLED, LOW);     // Turn off red LED
      } else {
        Serial.println("Password Incorrect!");
        digitalWrite(redLED, HIGH);    // Turn on red LED
        digitalWrite(greenLED, LOW);   // Turn off green LED
      }
      passwordIndex = 0; // Reset the entered password index
      delay(2000); // Wait for 2 seconds to show LED status before clearing
      digitalWrite(redLED, LOW);     // Turn off red LED
      digitalWrite(greenLED, LOW);   // Turn off green LED
    } else if (key == '*') {
      // Clear the entered password when '*' is pressed
      passwordIndex = 0;
      memset(enteredPassword, 0, sizeof(enteredPassword));  // Reset entered password
    } else {
      // Add the key to the entered password array
      if (passwordIndex < 4) {
        enteredPassword[passwordIndex] = key;
        passwordIndex++;
      }
    }
  }
}