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

namespace DarkWynterEngine.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;
    #endregion

    using DarkWynterEngine.Globals;
    using DarkWynterEngine.UserInterface;

    /// <summary>
    /// Frames Per Second counter, drawn to screen.
    /// </summary>
    public class FPSCounter
    {
        // Global Timers
        TimeSpan elapsedTime = TimeSpan.Zero;
        int frameRate = 0;
        int frameCounter = 0;

        /// <summary>
        /// Init Frames Per Second Counter
        /// </summary>
        public FPSCounter() {}

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

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

        /// <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.SystemSettings.enableFPSDisplay)
            {
                frameCounter++;
                Statics.SystemSettings.graphics.GraphicsDevice.Viewport = Statics.RenderSettings.defaultViewport;

                spriteBatch.Begin(SpriteBlendMode.AlphaBlend);
                spriteBatch.DrawString(FontWriter.Arial, frameRate.ToString(), new Vector2(20, 20), Color.Red);
                spriteBatch.End();
            }
        }
    }
}