#include <Wire.h> // Include the Wire library for I2C communication
#include <LiquidCrystal_I2C.h> // Include the library for LCD 1602 with I2C interface
#include <Keypad.h>
#include <Servo.h>

/* Locking mechanism definitions */
#define SERVO_PIN 6
#define SERVO_LOCK_POS   20
#define SERVO_UNLOCK_POS 90
Servo lockServo;

/* Display */
LiquidCrystal_I2C lcd(0x27, 16, 2); // Initialize LCD with I2C address 0x27, 16 columns, and 2 rows

/* Keypad setup */
const byte KEYPAD_ROWS = 4;
const byte KEYPAD_COLS = 4;
byte rowPins[KEYPAD_ROWS] = {5, 4, 3, 2};
byte colPins[KEYPAD_COLS] = {A3, A2, A1, A0};
char keys[KEYPAD_ROWS][KEYPAD_COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, KEYPAD_ROWS, KEYPAD_COLS);

/* SafeState stores the secret code in EEPROM */
class SafeState {
  String secretCode = "1234"; // Default secret code
  
public:
  bool locked() {
    // Simulating lock state
    return true;
  }

  void lock() {
    // Simulate locking action
  }

  void unlock() {
    // Simulate unlocking action
  }

  bool unlock(String code) {
    return code == secretCode;
  }

  void setCode(String newCode) {
    secretCode = newCode;
  }

  bool hasCode() {
    return secretCode.length() > 0;
  }

  bool setNewCode() {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Enter new code:");
    String newCode = secretCode();

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Confirm new code:");
    String confirmCode = secretCode();

    if (newCode.equals(confirmCode)) {
      setCode(newCode);
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Code changed");
      delay(1000);
      return true;
    } else {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Code mismatch");
      lcd.setCursor(0, 1);
      lcd.print("Try again");
      delay(2000);
      return false;
    }
  }
};

SafeState safeState;

void lock() {
  lockServo.write(SERVO_LOCK_POS);
  safeState.lock();
}

void unlock() {
  lockServo.write(SERVO_UNLOCK_POS);
}

void showStartupMessage() {
  lcd.setCursor(4, 0);
  lcd.print("Welcome!");
  delay(1000);

  lcd.setCursor(0, 1);
  String message = "ArduinoSafe v1.0";
  for (byte i = 0; i < message.length(); i++) {
    lcd.print(message[i]);
    delay(100);
  }
  delay(500);
}

String inputSecretCode() {
  lcd.setCursor(5, 1);
  lcd.print("[____]");
  lcd.setCursor(6, 1);
  String result = "";
  while (result.length() < 4) {
    char key = keypad.getKey();
    if (key >= '0' && key <= '9') {
      lcd.print('*');
      result += key;
    }
  }
  return result;
}

void showWaitScreen(int delayMillis) {
  lcd.setCursor(2, 1);
  lcd.print("[..........]");
  lcd.setCursor(3, 1);
  for (byte i = 0; i < 10; i++) {
    delay(delayMillis);
    lcd.print("=");
  }
}

bool setNewCode() {
  return safeState.setNewCode();
}

void showUnlockMessage() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.write(0); // Replace with your unlocked icon if you have one
  lcd.setCursor(4, 0);
  lcd.print("Unlocked!");
  lcd.setCursor(15, 0);
  lcd.write(0); // Replace with your unlocked icon if you have one
  delay(1000);
}

void safeUnlockedLogic() {
  lcd.clear();

  lcd.setCursor(0, 0);
  lcd.write(0); // Replace with your unlocked icon if you have one
  lcd.setCursor(2, 0);
  lcd.print(" # to lock");
  lcd.setCursor(15, 0);
  lcd.write(0); // Replace with your unlocked icon if you have one

  bool newCodeNeeded = true;

  if (safeState.hasCode()) {
    lcd.setCursor(0, 1);
    lcd.print("  * = new code");
    newCodeNeeded = false;
  }

  auto key = keypad.getKey();
  while (key != '*' && key != '#') {
    key = keypad.getKey();
  }

  bool readyToLock = true;
  if (key == '*' || newCodeNeeded) {
    readyToLock = setNewCode();
  }

  if (readyToLock) {
    lcd.clear();
    lcd.setCursor(5, 0);
    lcd.write(0); // Replace with your unlocked icon if you have one
    lcd.print(" ");
    lcd.write(0); // Replace with your arrow icon if you have one
    lcd.print(" ");
    lcd.write(0); // Replace with your locked icon if you have one

    safeState.lock();
    lock();
    showWaitScreen(100);
  }
}

void safeLockedLogic() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.write(0); // Replace with your locked icon if you have one
  lcd.print(" Safe Locked! ");
  lcd.write(0); // Replace with your locked icon if you have one

  String userCode = inputSecretCode();
  bool unlockedSuccessfully = safeState.unlock(userCode);
  showWaitScreen(200);

  if (unlockedSuccessfully) {
    showUnlockMessage();
    unlock();
  } else {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Access Denied!");
    showWaitScreen(1000);
  }
}

void setup() {
  lcd.begin(16, 2);

  lockServo.attach(SERVO_PIN);

  /* Make sure the physical lock is synced with the EEPROM state */
  Serial.begin(115200);
  if (safeState.locked()) {
    lock();
  } else {
    unlock();
  }

  showStartupMessage();
}

void loop() {
  if (safeState.locked()) {
    safeLockedLogic();
  } else {
    safeUnlockedLogic();
  }
}