#define BUTTON_PIN A0  // Define the Button readState pin.
#define LED_PIN    7   // Define the LED output pin.

#define DEFAULT_DEBOUNCE_PERIOD 10UL  // // Debounce Delay 10 milliseconds

enum state_t : bool {
  PRESSED = true,
  RELEASED = false
};

typedef struct {
  // TODO: DEFINE THE OBJECT MEMBERS
  bool toggle;
} Object;

typedef struct {
  private:
    bool state;               //
    bool input;                 // Enable Timer On Variable
    unsigned long startTime;    // Retrigable start time

    typedef void (*CallbackFunction)(Object *obj, bool state);  //  Callback Function Pointer
    CallbackFunction callbackFunction;
    Object *object;
  public:
    // Timer On Function
    void onPressed(CallbackFunction function, Object *obj) {
      callbackFunction = function;
      object = obj;
    }

    void pressed(bool bounce, const unsigned long timeDelay = DEFAULT_DEBOUNCE_PERIOD) {
      //If a time on the done is "false"
      bool prevState = state;
      if (bounce) {
        state = true;
      } else {
        if (state) {
          unsigned long currTime = millis();
          // Reload start time by retrigable
          if (input) {
            startTime = currTime;   // Set start time with current time in milliseconds
          }
          unsigned long elapsedTime = currTime - startTime;
          // If elapsed time greater than or equal to the time delay
          if (elapsedTime >= timeDelay) {
            state = false;
          }
        }
      }

      if (prevState != state) {
        if (callbackFunction) {
          callbackFunction(object, state);
        }
      }
      input = bounce;
    }
} pressed_t;

pressed_t button;
Object object;
bool toggle;

void EventOnPressed(Object *obj);

void setup() {
  Serial.begin(115200);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  pinMode(LED_PIN, OUTPUT);

  button.onPressed(EventOnPressed, &object);
}

void loop() {
  button.pressed(!digitalRead(BUTTON_PIN));
  digitalWrite(LED_PIN, object.toggle);
}

void EventOnPressed(Object *obj, bool state) {
  // TODO: IMPLEMENT EVENT ON PRESSED
  if (state == PRESSED)
    obj->toggle = !obj->toggle;
}