using System.Collections.Generic;
using System.Diagnostics;

namespace ProjectZ.Base
{
    public class StopWatchTracker
    {
        private readonly Dictionary<string, TickCounter> _timespans = new Dictionary<string, TickCounter>();
        private readonly Stopwatch _stopWatch = new Stopwatch();

        private string _timespanName;
        private readonly int _averageSize;

        public StopWatchTracker(int averageSize)
        {
            _averageSize = averageSize;
        }

        public void Start(string timespanName)
        {
            if (_timespanName != null)
                Stop();

            _timespanName = timespanName;

            _stopWatch.Reset();
            _stopWatch.Start();
        }

        public void Stop()
        {
            if (_timespanName == null)
                return;
            
            _stopWatch.Stop();

            // add a new entry if the counter does not already exists
            if (!_timespans.ContainsKey(_timespanName))
                _timespans.Add(_timespanName, new TickCounter(_averageSize));

            _timespans[_timespanName].AddTick(_stopWatch.ElapsedTicks);

            _timespanName = null;
        }

        public string GetString()
        {
            var strCounter = "";

            foreach (var tickCounter in _timespans)
                strCounter += (strCounter == "" ? "" : "\n") + tickCounter.Key + ":\t" + tickCounter.Value.AverageTime;

            return strCounter;
        }
    }
}