TimerRemaining.h

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#ifndef TIMERREMAINING_H
#define TIMERREMAINING_H
 
#include "Timer.h"
#include "Arduino.h"
#include "system_timer.h"
#include <limits.h>
 
class TimerRemaining : public LongTimer
{
public:
    TimerRemaining() : m_period(){}
    void start() = delete;
    bool expired(unsigned long msPeriod) = delete;
    void start(unsigned long msPeriod)
    {
        m_period = msPeriod;
        LongTimer::start();
    }
    unsigned long remaining()
    {
      if (!running()) return 0;
      if (expired()) return 0;
      const unsigned long now = _millis();
      return (started() + m_period - now);
    }
    bool expired()
    {
        return LongTimer::expired(m_period);
    }
private:
    unsigned long m_period; 
};
 
#endif // ifndef TIMERREMAINING_H