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 BadGame
{
    public struct PlayerData
    {
        public Vector2 Position;
        public int Health;
    }

    public class Game1 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        GraphicsDevice device;

        SpriteBatch spriteBatch;
        SpriteFont font;

        Texture2D backgroundTexture;
        Texture2D levelTexture;
        Texture2D foregroundTexture;
        Texture2D playerTexture;

        int screenHeight;
        int screenWidth;

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

        protected override void Initialize()
        {
            graphics.PreferredBackBufferWidth = 800;
            graphics.PreferredBackBufferHeight = 400;
            graphics.IsFullScreen = false;
            graphics.ApplyChanges();

            Window.Title = "Terrible Game";

            base.Initialize();
        }

        public static PlayerData Save1 = new PlayerData();
        public static void BuildPlayerData()
        {
            Save1.Position = new Vector2(0, 312);
            Save1.Health = 100;
        }

        protected override void LoadContent()
        {
            device = graphics.GraphicsDevice;
            spriteBatch = new SpriteBatch(GraphicsDevice);

            backgroundTexture = Content.Load<Texture2D>("background");
            levelTexture = Content.Load<Texture2D>("level");
            playerTexture = Content.Load<Texture2D>("player");
            foregroundTexture = Content.Load<Texture2D>("foreground");
            font = Content.Load<SpriteFont>("gameFont");

            screenWidth = device.PresentationParameters.BackBufferWidth;
            screenHeight = device.PresentationParameters.BackBufferHeight;

            BuildPlayerData();
        }

        protected override void UnloadContent()
        {

        }

        protected override void Update(GameTime gameTime)
        {
            KeyboardState keyboard = Keyboard.GetState();
            Vector2 input = Vector2.Zero;

            if (keyboard.IsKeyDown(Keys.W)) input.Y -= 1;
            if (keyboard.IsKeyDown(Keys.A)) input.X -= 1;
            if (keyboard.IsKeyDown(Keys.S)) input.Y += 1;
            if (keyboard.IsKeyDown(Keys.D)) input.X += 1;

            if (input != Vector2.Zero)
            {
                input.Normalize();
                Save1.Position += input * 2;

            }
            base.Update(gameTime);
        }

        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);

            spriteBatch.Begin();
            DrawLevel();
            DrawPlayer();
            DrawText();
            spriteBatch.End();

            base.Draw(gameTime);

        }

        private void DrawText()
        {
            spriteBatch.DrawString(font, String.Format("Position: {0}", Save1.Position), new Vector2(0, 0), Color.White);
        }

        private void DrawLevel()
        {
            Rectangle screenRectangle = new Rectangle(0, 0, screenWidth, screenHeight);
            spriteBatch.Draw(backgroundTexture, screenRectangle, Color.White);
            spriteBatch.Draw(levelTexture, screenRectangle, Color.White);
            spriteBatch.Draw(foregroundTexture, screenRectangle, Color.White);
        }

        private void DrawPlayer()
        {
            spriteBatch.Draw(playerTexture, Save1.Position, Color.White);
        }
    }
}