//---------------------------------------------------------------------------------------------------------------------------------------------------
// <copyright file="FPSCounter.cs" company="DarkWynter Studios">
//     Copyright (C)2007 DarkWynter Studios.  All rights reserved.
// </copyright>
//---------------------------------------------------------------------------------------------------------------------------------------------------
// {Contact : darkwynter.com for licensing information
//---------------------------------------------------------------------------------------------------------------------------------------------------

namespace DarkWynter.Engine.Utilities
{
    #region Using Statements
    using System;
    using System.Collections.Generic;
    using System.Diagnostics;
    using Microsoft.Xna.Framework;
    using Microsoft.Xna.Framework.Audio;
    using Microsoft.Xna.Framework.Content;
    using Microsoft.Xna.Framework.Graphics;
    using Microsoft.Xna.Framework.Input;
    using Microsoft.Xna.Framework.Storage;
    using System.Xml;
    using DarkWynter.Engine.Globals;
    using DarkWynter.Stream;
    #endregion


    /// <summary>
    /// Frames Per Second counter, drawn to screen.
    /// </summary>
    public class FPSCounter
    {
        // Global Timers
        TimeSpan elapsedTime = TimeSpan.Zero;
        
        private int _frameRate = 0;
        public int frameRate { get { return _frameRate; } set { _frameRate = value; } }

        private int _frameCounter = 0;
        public int frameCounter { get { return _frameCounter; } set { _frameCounter = value; } }

        private int _runTimeSum = 0;
        public int runTimeSum { get { return _runTimeSum; } set { _runTimeSum = value; } }

        private int _runTimeCycles = 1;
        public int runTimeCycles { get { return _runTimeCycles; } set { _runTimeCycles = value; } }

        /// <summary>
        /// Init Frames Per Second Counter
        /// </summary>
        public FPSCounter(bool visible) 
        {
            //Statics_Engine.SystemSettings.enableFPSDisplay = visible;
        }

        /// <summary>
        /// Update the Frames Per Second counter
        /// </summary>
        public void Update()
        {
            elapsedTime += Statics_Engine.SystemSettings.elementalGameTime.ElapsedGameTime;

            if (elapsedTime > TimeSpan.FromSeconds(1))
            {
                elapsedTime -= TimeSpan.FromSeconds(1);
                frameRate = frameCounter;
                frameCounter = 0;

                // MenuSystem framerates throw off calculations
                if (frameRate < 300)
                {
                    runTimeSum += frameRate;
                    runTimeCycles++;
                }
            }
        }

        /// <summary>
        /// Draw the Frames Per Second counter
        /// </summary>
        /// <param name="spriteBatch">SpriteBatch used to draw used to draw.</param>
        public void Draw(SpriteBatch spriteBatch)
        {
            if (Statics_Engine.SystemSettings.enableFPSDisplay)
            {
                frameCounter++;
                Statics_Stream.RenderSettings.graphics.GraphicsDevice.Viewport = Statics_Stream.RenderSettings.defaultViewport;

                spriteBatch.Begin(SpriteBlendMode.AlphaBlend);
                spriteBatch.DrawString(Statics_Stream.Fonts.Arial, frameRate.ToString(), new Vector2(20, 20), Color.Red);
                spriteBatch.DrawString(Statics_Stream.Fonts.Arial, (runTimeSum / runTimeCycles).ToString(), new Vector2(20, 40), Color.Green);
                spriteBatch.End();
            }
        }
    }
}