public class BattleClock {
    public delegate void TimeChangedAction(BattleTime timeNow);
    public event TimeChangedAction OnTimeChanged;

    private int mRoundNumber;
    private RoundStep mStep;

    public BattleClock() {
        mRoundNumber = 0;
        mStep = RoundStep.None;
    }

    public void AdvanceRound() {
        mRoundNumber++;
        mStep = RoundStep.StartOfRound;
        TriggerOnTimeChanged();
    }

    public void AdvanceToStep(RoundStep step) {
        mStep = step;
        TriggerOnTimeChanged();
    }

    private void TriggerOnTimeChanged() {
        if (OnTimeChanged != null) OnTimeChanged(this.Now);
    }

    public BattleTime Now {get => new BattleTime(mRoundNumber, mStep);}
}