Button Debounce

unsigned long ButtonTime;
enum button {ButtonIdle, ButtonWait, ButtonLow};
enum button ButtonState;
int ButtonInitialize()
{
  pinMode(4, INPUT);
  pinMode(13, OUTPUT);
  ButtonState = ButtonWait;
}
int ButtonNextState(int press)
{
  switch (ButtonState) {
    case ButtonIdle:
      if (press == LOW)
      {
        ButtonTime = millis(); // time is measured in milliseconds
        ButtonState = ButtonWait;
      }
      break;
    case ButtonWait:
      if (press == HIGH)
      {
        ButtonState = ButtonIdle;
      }
      else if (millis() - ButtonTime >= 5)
      {
        ButtonState = ButtonLow;
        return 1;
      }
      break;
    case ButtonLow:
      if (press == HIGH) {
        //ButtonState == ButtonIdle;
        if (millis() - ButtonTime < 1000 )
        {
          ButtonState = ButtonIdle;
          return 2;
        }
        else
        {
          ButtonState = ButtonIdle;
          return 3;
        }
        //Serial.println(2);
      }
      break;
  }
  return 0; //Serial.println(0);
}