using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.GamerServices;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Media;

namespace PlanetTest
{
    /// <summary>
    /// This is the main type for your game
    /// </summary>
    public class Game1 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;

        PlanetTerrainMap terrain;
        Model sphere;

        Matrix ViewMatrix;
        Matrix ProjectionMatrix;

        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
        }

        /// <summary>
        /// Allows the game to perform any initialization it needs to before starting to run.
        /// This is where it can query for any required services and load any non-graphic
        /// related content.  Calling base.Initialize will enumerate through any components
        /// and initialize them as well.
        /// </summary>
        protected override void Initialize()
        {
            // TODO: Add your initialization logic here
            ViewMatrix = Matrix.CreateLookAt(new Vector3(0, 0, -10), new Vector3(0, 0, 0), Vector3.Up);
            ProjectionMatrix = Matrix.CreatePerspectiveFieldOfView(MathHelper.PiOver4, GraphicsDevice.Viewport.AspectRatio, 1, 1000);
            base.Initialize();
        }

        /// <summary>
        /// LoadContent will be called once per game and is the place to load
        /// all of your content.
        /// </summary>
        protected override void LoadContent()
        {
            // Create a new SpriteBatch, which can be used to draw textures.
            spriteBatch = new SpriteBatch(GraphicsDevice);
            sphere = Content.Load<Model>("sphere");
            terrain = new PlanetTerrainMap(1000, 20, GraphicsDevice, Content);
            // TODO: use this.Content to load your game content here
        }

        /// <summary>
        /// UnloadContent will be called once per game and is the place to unload
        /// all content.
        /// </summary>
        protected override void UnloadContent()
        {
            // TODO: Unload any non ContentManager content here
        }

        /// <summary>
        /// Allows the game to run logic such as updating the world,
        /// checking for collisions, gathering input, and playing audio.
        /// </summary>
        /// <param name="gameTime">Provides a snapshot of timing values.</param>
        protected override void Update(GameTime gameTime)
        {
            // Allows the game to exit
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
                this.Exit();

            

            // TODO: Add your update logic here

            base.Update(gameTime);
        }

        /// <summary>
        /// This is called when the game should draw itself.
        /// </summary>
        /// <param name="gameTime">Provides a snapshot of timing values.</param>
        protected override void Draw(GameTime gameTime)
        {

            float time = (float)gameTime.TotalGameTime.TotalSeconds;

            Matrix rotation = Matrix.CreateRotationY(time * 0.5f);

            GraphicsDevice.Clear(Color.CornflowerBlue);

            Matrix[] transforms = new Matrix[sphere.Bones.Count];
            sphere.CopyAbsoluteBoneTransformsTo(transforms);
            RasterizerState rState = new RasterizerState();
            rState.FillMode = FillMode.Solid;
            GraphicsDevice.RasterizerState = rState;

            foreach (ModelMesh mesh in sphere.Meshes)
            {
                foreach (BasicEffect effect in mesh.Effects)
                {
                    effect.World = (transforms[mesh.ParentBone.Index] * rotation);
                    //effect.Parameters["WorldInverseTranspose"].SetValue(Matrix.Transpose(Matrix.Invert(transforms[mesh.ParentBone.Index] * world)));
                    effect.View = ViewMatrix;
                    effect.Projection = ProjectionMatrix;
                    effect.Texture = terrain.Image;
                    //for testing purposes:
                    //effect.Parameters["DiffuseColor"].SetValue(new Vector4(1, 0, 0, 1));
                }
                mesh.Draw();
            }
            // TODO: Add your drawing code here

            base.Draw(gameTime);
        }
    }
}