#region File Description
//-----------------------------------------------------------------------------
// Game.cs
//
// Microsoft XNA Community Game Platform
// Copyright (C) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
#endregion

#region Using Statements
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
#endregion

namespace ObjImporterSample
{
    /// <summary>
    /// This class displays the imported model and animates it rotating. 
    /// It is useful for testing importer.
    /// </summary>
    public class ObjImporterGame : Microsoft.Xna.Framework.Game
    {
        #region Fields

        GraphicsDeviceManager graphics;

        Model model;

        #endregion

        #region Initialization


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


        /// <summary>
        /// Load your graphics content.
        /// </summary>
        protected override void LoadContent()
        {
            model = Content.Load<Model>("Tank");                
        }


        #endregion

        #region Update and Draw


        /// <summary>
        /// Allows the game to run logic.
        /// </summary>
        protected override void Update(GameTime gameTime)
        {
            base.Update(gameTime);

            KeyboardState keyboardState = Keyboard.GetState();
            GamePadState gamePadState = GamePad.GetState(PlayerIndex.One);

            // Check for exit.
            if (keyboardState.IsKeyDown(Keys.Escape) ||
                gamePadState.Buttons.Back == ButtonState.Pressed)
            {
                Exit();
            }
        }


        /// <summary>
        /// This is called when the game should draw itself.
        /// </summary>
        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice device = graphics.GraphicsDevice;

            device.Clear(Color.CornflowerBlue);

            // Animated the model rotating
            float modelRotation = (float)gameTime.TotalGameTime.TotalSeconds / 5.0f;

            // Set the positions of the camera in world space, for our view matrix.
            Vector3 cameraPosition = new Vector3(0.0f, 200.0f, 350.0f);
            Vector3 lookAt = new Vector3(0.0f, 35.0f, 0.0f);

            // Copy any parent transforms.
            Matrix[] transforms = new Matrix[model.Bones.Count];
            model.CopyAbsoluteBoneTransformsTo(transforms);

            // Draw the model. A model can have multiple meshes, so loop.
            foreach (ModelMesh mesh in model.Meshes)
            {
                // This is where the mesh orientation is set,
                // as well as our camera and projection.
                foreach (BasicEffect effect in mesh.Effects)
                {
                    effect.EnableDefaultLighting();
                    effect.World = transforms[mesh.ParentBone.Index] *
                        Matrix.CreateRotationY(modelRotation);
                    effect.View = Matrix.CreateLookAt(cameraPosition, lookAt,
                        Vector3.Up);
                    effect.Projection = Matrix.CreatePerspectiveFieldOfView(
                        MathHelper.ToRadians(45.0f), device.Viewport.AspectRatio, 1.0f, 10000.0f);
                }
                // Draw the mesh, using the effects set above.
                mesh.Draw();
            }


            base.Draw(gameTime);
        }


        #endregion
    }


    #region Entry Point

    /// <summary>
    /// The main entry point for the application.
    /// </summary>
    static class Program
    {
        static void Main()
        {
            using (ObjImporterGame game = new ObjImporterGame())
            {
                game.Run();
            }
        }
    }

    #endregion
}