using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows.Threading;

using System.Diagnostics;



namespace Microsoft.Research.Visualization3D.MainLoops

{

    class TimeManager

    {

        private delegate void EmptyEventHandler();

        public delegate void TimedEventHandler(object sender, TimedEventArgs e);

        private long oldTime;

        private long delta;

        private float timeProportion = 100000.0f;

        Stopwatch stopwatch;



        private TimeEntity currentTimeEntity;



        public TimeEntity Current

        {

            get 

            {

                long newTime = stopwatch.ElapsedTicks;

                delta = newTime - currentTimeEntity.TotalTime.Ticks;

                currentTimeEntity = new TimeEntity(TimeSpan.FromTicks(delta), TimeSpan.FromTicks(newTime));

                return currentTimeEntity; 

            }

        }

        

       



        public event TimedEventHandler Update;



        public TimeManager()

        {

            currentTimeEntity = new TimeEntity(TimeSpan.FromMilliseconds(0), TimeSpan.FromMilliseconds(0));

        }



        private void RaiseUpdate(TimedEventArgs e)

        {

            if (Update != null)

                Update(this, e);

        }



        public void Start()

        {

            stopwatch = Stopwatch.StartNew();

            Dispatcher.CurrentDispatcher.BeginInvoke(new EmptyEventHandler(MainLoop), DispatcherPriority.ApplicationIdle, null);

        }



        private void MainLoop()

        {

            long newTime = stopwatch.ElapsedTicks;

            delta = newTime - currentTimeEntity.TotalTime.Ticks;

            currentTimeEntity = new TimeEntity(TimeSpan.FromTicks(delta), TimeSpan.FromTicks(newTime));

            RaiseUpdate(new TimedEventArgs { TimeEntity = currentTimeEntity });

            Dispatcher.CurrentDispatcher.BeginInvoke(new EmptyEventHandler(MainLoop), DispatcherPriority.ApplicationIdle, null);

        }

    }



    public class TimedEventArgs

    {

        public TimeEntity TimeEntity

        {

            get;

            set;

        }

    }

}