#include <Keypad.h>

class KeypadHandler {
private:
  static constexpr uint8_t ROWS = 4;
  static constexpr uint8_t COLS = 4;
  Keypad* keypad;
public:
  void init(uint8_t *rowPins, uint8_t *colPins) {
    const char *keys = "123A456B789C*0#D";
    keypad = new Keypad(keys, rowPins, colPins, ROWS, COLS);
  }

  char getKey() {
    return keypad->getKey();
  }

  ~KeypadHandler() {
    delete keypad;
  }
};

class SecurityManager {

};


KeypadHandler keypadHandler;
void setup() {
  Serial.begin(9600);
  static constexpr uint8_t colPins[] = { 5, 4, 3, 2 }; // C1, C2, C3, C4
  static constexpr uint8_t rowPins[] = { 9, 8, 7, 6 }; // R1, R2, R3, R4
  keypadHandler.init(rowPins, colPins);
}

void loop() {
  char key = keypadHandler.getKey();
  if (key == NO_KEY) {
    return;
  }
  Serial.println(key);
}