using System;
using System.Diagnostics;


namespace SpaceInvaders
{
    public class GlobalTimer
    {
        //-------------------------------------------------------------------
        //  FIELDS
        //-------------------------------------------------------------------

        protected float currGlobalTime;
        private static GlobalTimer poInstance = null;


        //-------------------------------------------------------------------
        //  PRIVATE CONSTRUCTION
        //-------------------------------------------------------------------

        private GlobalTimer()
        {
            this.currGlobalTime = 0.0f;
        }


        //-------------------------------------------------------------------
        //  PUBLIC METHODS
        //-------------------------------------------------------------------

        public static void Update(float time)
        {
            GlobalTimer pTimer = GlobalTimer.GetInstance();
            pTimer.currGlobalTime = time;
        }

        public static float GetTime()
        {
            GlobalTimer pTimer = GlobalTimer.GetInstance();
            return pTimer.currGlobalTime;
        }


        //-------------------------------------------------------------------
        //  PRIVATE METHODS
        //-------------------------------------------------------------------

        private static GlobalTimer GetInstance()
        {
            if (GlobalTimer.poInstance == null)
            {
                GlobalTimer.poInstance = new GlobalTimer();
                Debug.Assert(GlobalTimer.poInstance != null);
            }

            return GlobalTimer.poInstance;
        }


    } //end class

} // end namespace