#region Using Statements
using System;
using System.Reflection;
using System.Collections.Generic;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;
#endregion

namespace NekoCake
{
    /// <summary>
    /// This is a game component that implements IUpdateable.
    /// </summary>
    public class pmv1 : Microsoft.Xna.Framework.DrawableGameComponent
    {
        private ContentManager content;
        // display varibles
        private SpriteBatch batch;
        private SpriteFont font;
        //FPS varibles
        private int totalFrames;
        private double currentFPS;
        private double averageFPS;
        private double highestFPS;
        private double lowestFPS = 999; // has to be initilised to a value over 0
        //Frame Time varibles
        private double lastFrameTime;
        private double averageFrameTime;
        private double bestFrameTime = 999; // see lowestFPS
        private double worstFrameTime;
        // strings
        string output;
        //other
        GraphicsDeviceManager graphics;

        public pmv1(Game game, GraphicsDeviceManager graphics)
            : base(game)
        {
            this.graphics = graphics;
        }

        public override void Initialize()
        {
            content = new ContentManager(base.Game.Services);
            fontPos = new Vector2(100,100);

            base.Initialize();
        }

        protected override void LoadGraphicsContent(bool loadAllContent)
        {
            if (loadAllContent)
            {
                batch = new SpriteBatch(graphics.GraphicsDevice);
                //load content files
                font = content.Load<SpriteFont>("assets\\font\\console");
            }
        }

        protected override void UnloadGraphicsContent(bool unloadAllContent)
        {
            if (unloadAllContent == true)
            {
                content.Unload();
            }
        }

        public override void Update(GameTime gameTime)
        {
            // increment frame counter.
            totalFrames++;
            //fps calculations
            currentFPS = 1 / gameTime.ElapsedGameTime.TotalSeconds;
            averageFPS = totalFrames / gameTime.TotalGameTime.TotalSeconds;
            // highest fps (have to check if current fps is infinity, sometimes (mainly at the start of the program) currentFPS my be infinite!
            if (currentFPS > highestFPS && !double.IsInfinity(currentFPS)) highestFPS = currentFPS;
            // lowest fps
            if (currentFPS < lowestFPS) lowestFPS = currentFPS;

            //frame time calculations
            lastFrameTime = 1000 / currentFPS;
            averageFrameTime = gameTime.TotalGameTime.TotalMilliseconds / totalFrames;
            // best frame time
            if (lastFrameTime < bestFrameTime && lastFrameTime != 0) bestFrameTime = lastFrameTime;
            // worst
            if (lastFrameTime > worstFrameTime) worstFrameTime = lastFrameTime;
            
            //build the output string.
            output = "FPS Stats (Higher is better)\n CurrentFPS: " + currentFPS.ToString("##.##") + 
                " \n Average FPS: " + averageFPS.ToString("##.##") + 
                "\n Highest FPS: " + highestFPS.ToString("##.##") + 
                "\n Lowest FPS: " + lowestFPS.ToString("##.##") + 
                "\nFrame Time Stats (Lower is better) \n Last Frame Time: " + lastFrameTime.ToString("##.####") + 
                "\n Average Frame Time: " + averageFrameTime.ToString("##.####") + 
                " \n Best Frame Time: " + bestFrameTime.ToString("##.####") + 
                " \n Wosrts Frame Time: " + worstFrameTime.ToString("##.####") + 
                "\n \n \nTotal Frames: " + totalFrames.ToString() + 
                "\nTime Running " + gameTime.TotalRealTime.ToString();


            //base.Update(gameTime);
        }



        public override void Draw(GameTime gameTime)
        {
            batch.Begin();
            batch.DrawString(font,output,Vector2.Zero,Color.White);//draw the text
            batch.End();
        }

    }
}