using System;
using System.Diagnostics;

namespace DTS.Common.Utils
{
    public readonly struct ValueStopwatch
    {
        private static readonly double TimestampToTicks = TimeSpan.TicksPerSecond / (double)Stopwatch.Frequency;
        private readonly long _startTimestamp;

        private ValueStopwatch(long startTimestamp) => _startTimestamp = startTimestamp;

        public static ValueStopwatch StartNew() => new ValueStopwatch(Stopwatch.GetTimestamp());

        public TimeSpan GetElapsedTime()
        {
            var end = Stopwatch.GetTimestamp();
            var elapsedTicks = (long)((end - _startTimestamp) * TimestampToTicks);
            return new TimeSpan(elapsedTicks);
        }
    }
}