openmw/components/misc/timer.hpp

#ifndef OPENMW_COMPONENTS_MISC_TIMER_H
#define OPENMW_COMPONENTS_MISC_TIMER_H

#include "rng.hpp"

namespace Misc
{
    enum class TimerStatus
    {
        Waiting,
        Elapsed,
    };

    class DeviatingPeriodicTimer
    {
    public:
        explicit DeviatingPeriodicTimer(float period, float deviation, float timeLeft)
            : mPeriod(period)
            , mDeviation(deviation)
            , mTimeLeft(timeLeft)
        {
        }

        TimerStatus update(float duration, Rng::Generator& prng)
        {
            if (mTimeLeft > 0)
            {
                mTimeLeft -= duration;
                return TimerStatus::Waiting;
            }

            mTimeLeft = Rng::deviate(mPeriod, mDeviation, prng);
            return TimerStatus::Elapsed;
        }

        void reset(float timeLeft) { mTimeLeft = timeLeft; }

    private:
        const float mPeriod;
        const float mDeviation;
        float mTimeLeft;
    };
}

#endif