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

const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

uint8_t colPins[COLS] = { 17, 16, 4, 2 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 23, 19, 18, 5 }; // Pins connected to R1, R2, R3, R4

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

LiquidCrystal_I2C lcd(0x27, 16, 2);

int count = 0;
int a = 0, b = 0, c = 0, d = 0;
int var = 0; 
int C1 = 1, C2 = 2, C3 = 3, C4 = 4;
bool success = false;
bool buzzerEnabled = false; // Menyimpan status apakah buzzer diizinkan atau tidak
int wrongAttempts = 0; // Menghitung jumlah kesalahan password

void setup() {
  pinMode(12, OUTPUT); // Pin for door lock
  pinMode(27, OUTPUT); // Pin for buzzer
  lcd.init();
  lcd.backlight();
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}

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

  if (success) {
    if (key == 'A') {
      success = false;
      lcd.setCursor(3, 1);
      lcd.print("door lock");
      delay(1000);
      digitalWrite(12, LOW);  // Turn off pin 12
      lcd.clear();
    }
    return;  // Exit the loop early to prevent further processing of the key
  }

  if (key) {
    lcd.setCursor(6 + var, 1);
    lcd.print(key);
    key = key - 48;
    var++; 

    switch (var) {
      case 1:
        a = key; 
        break;
      case 2:
        b = key; 
        break;
      case 3:
        c = key; 
        break;
      case 4:
        d = key;
        delay(50);

        if (a == C1 && b == C2 && c == C3 && d == C4) {
          lcd.clear();
          lcd.setCursor(4, 0);
          count = 0;
          wrongAttempts = 0; // Reset wrong attempts on successful entry
          digitalWrite(12, HIGH);
          lcd.print("SUCCESS");
          success = true;
        } else {
          // Menambah jumlah kesalahan password
          wrongAttempts++;
          // Mengatur bunyi buzzer berdasarkan jumlah kesalahan password
          if (wrongAttempts == 1) {
            // Jika jumlah kesalahan password pertama kali, tidak ada bunyi buzzer
            buzzerEnabled = false;
          } else if (wrongAttempts == 3) {
            // Jika jumlah kesalahan password ketiga kali, aktifkan bunyi buzzer
            buzzerEnabled = true;
          }

          if (buzzerEnabled) {
            // Aktifkan bunyi buzzer jika diizinkan
            tone(27, 1000, 500); // Generate a 1kHz tone for 500ms on pin 27
          }

          if (count == 2) {
            digitalWrite(12, LOW);
            delay(200);
          }

          lcd.clear();
          lcd.setCursor(4, 0);
          lcd.print("DENIED");
          delay(1000);
          lcd.clear();
          count++;
        }

        // Reset count and wrongAttempts if count reaches 4
        if (count == 4) {
          count = 0;
          wrongAttempts = 0;
        }
      
        var = 0;
        break;
    }
  }

  if (!key && !success) {
    lcd.setCursor(0, 0);
    lcd.print("Enter Password");
  }

  delay(2);
}