GameTimer.cs

namespace Game.Shared.Helpers
{
    public class GameTimer
    {
        private float _time;
        private float _maxTime;

        public GameTimer(float maxTime)
        {
            _maxTime = maxTime;
            Finish();
        }

        public GameTimer()
        {
            
        }

        public float MaxTime
        {
            get { return _maxTime; }
        }

        public float ElapsedTime
        {
            get { return _time; }
        }

        public bool IsTimeElapsed
        {
            get { return _time >= _maxTime; }
        }

        public float Progress
        {
            get
            {
                float p = _time/_maxTime;
                return p > 1f ? 1f : p;
            }
        }

        public void Invert()
        {
            if (_time < _maxTime)
                _time = _maxTime - _time;
            else
                _time = 0f;
        }

        public void Reset()
        {
            if (_time > _maxTime)
                _time -= _maxTime;
            else
                _time = 0f;
        }

        public void Reset(float maxTime)
        {
            _maxTime = maxTime;
            _time = 0f;
        }

        public void Finish()
        {
            _time = _maxTime;
        }

        public float LerpByProgress(float a, float b)
        {
            return a + (b - a) * Progress;
        }

        public float LerpByProgress(float a, float b, bool inverse)
        {
            return inverse
                ? b + (a - b) * Progress
                : a + (b - a) * Progress;
        }

        public bool UpdateAndCheck(float delta)
        {
            if (IsTimeElapsed)
                return false;
            return Update(delta);
        }

        public bool Update(float delta)
        {
            if(_time < _maxTime)
                _time += delta;
            return IsTimeElapsed;
        }
    }
}