using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using Tutorial018.Sprites;

namespace Tutorial018
{
  /// <summary>
  /// This is the main type for your game.
  /// </summary>
  public class Game1 : Game
  {
    GraphicsDeviceManager graphics;
    SpriteBatch spriteBatch;

    private KeyboardState _currentKey;
    private KeyboardState _previousKey;

    private bool _showBorders = false;

    private List<Sprite> _sprites;

    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

      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);

      _sprites = new List<Sprite>
      {
        new Sprite(graphics.GraphicsDevice, Content.Load<Texture2D>("Square"))
        {
          Position = new Vector2(100, 100),
        },
        new Player(graphics.GraphicsDevice, Content.Load<Texture2D>("Apple"))
        {
          Position = new Vector2(200, 100),
        },
        new Sprite(graphics.GraphicsDevice, Content.Load<Texture2D>("Bomb"))
        {
          Position = new Vector2(200, 200),
        }
      };
    }

    /// <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)
    {
      _previousKey = _currentKey;
      _currentKey = Keyboard.GetState();

      if (_currentKey.IsKeyUp(Keys.F1) && _previousKey.IsKeyDown(Keys.F1))
        _showBorders = !_showBorders;

      foreach (var sprite in _sprites)
        sprite.Update(gameTime);

      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);

      spriteBatch.Begin();

      foreach (var sprite in _sprites)
      {
        sprite.ShowRectangle = _showBorders;
        sprite.Draw(gameTime, spriteBatch);
      }

      spriteBatch.End();

      base.Draw(gameTime);
    }
  }
}