using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;

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

        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>
        Quad quad;
        Quad quad2;
        VertexDeclaration vertexDeclaration;
        Matrix View, Projection;
        protected override void Initialize()
        {
            quad = new Quad(Vector3.Zero, Vector3.Backward, Vector3.Up, 1, 1);
            quad2 = new Quad(new Vector3(0.5f,0,1), Vector3.Backward, Vector3.Up, 1, 1);
            View = Matrix.CreateLookAt(new Vector3(0, 0, 2), Vector3.Zero,
                Vector3.Up);
            Projection = Matrix.CreatePerspectiveFieldOfView(
                MathHelper.PiOver4, 4.0f / 3.0f, 1, 500);

            base.Initialize();
        }

        /// <summary>
        /// LoadContent will be called once per game and is the place to load
        /// all of your content.
        /// </summary>
        Texture2D texture;
        BasicEffect quadEffect;
        BasicEffect quadEffect2;
        protected override void LoadContent()
        {
            // Create a new SpriteBatch, which can be used to draw textures.
            spriteBatch = new SpriteBatch(GraphicsDevice);
            texture = Content.Load<Texture2D>("Placeholder");
            quadEffect = new BasicEffect(graphics.GraphicsDevice);
            quadEffect2 = new BasicEffect(graphics.GraphicsDevice);
            //quadEffect.EnableDefaultLighting();

            quadEffect.World = Matrix.Identity;
            quadEffect.View = View;
            quadEffect.Projection = Projection;
            quadEffect.TextureEnabled = true;
            quadEffect.Texture = texture;

            quadEffect2.World = Matrix.Identity;
            quadEffect2.View = View;
            quadEffect2.Projection = Projection;
            quadEffect2.TextureEnabled = true;
            quadEffect2.Texture = texture;

            vertexDeclaration = new VertexDeclaration(new VertexElement[]
                {
                    new VertexElement(0, VertexElementFormat.Vector3, VertexElementUsage.Position, 0),
                    new VertexElement(12, VertexElementFormat.Vector3, VertexElementUsage.Normal, 0),
                    new VertexElement(24, VertexElementFormat.Vector2, VertexElementUsage.TextureCoordinate, 0)
                });

        }

        /// <summary>
        /// UnloadContent will be called once per game and is the place to unload
        /// game-specific 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)
        {
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed || Keyboard.GetState().IsKeyDown(Keys.Escape))
                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)
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);
            foreach (EffectPass pass in quadEffect.CurrentTechnique.Passes)
            {
                pass.Apply();

                GraphicsDevice.DrawUserIndexedPrimitives
                    <VertexPositionNormalTexture>(
                    PrimitiveType.TriangleList,
                    quad2.Vertices, 0, 4,
                    quad2.Indexes, 0, 2);

                GraphicsDevice.DrawUserIndexedPrimitives
                    <VertexPositionNormalTexture>(
                    PrimitiveType.TriangleList,
                    quad.Vertices, 0, 4,
                    quad.Indexes, 0, 2);
            }

            base.Draw(gameTime);
        }
    }
}