using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace Tutorial018.Sprites
{
  public class Sprite : Component
  {
    protected Texture2D _rectangleTexture;

    protected Texture2D _texture;

    public Vector2 Position;

    public Rectangle Rectangle
    {
      get { return new Rectangle((int)Position.X, (int)Position.Y, _texture.Width, _texture.Height); }
    }

    public bool ShowRectangle { get; set; }

    public Sprite(Texture2D texture)
    {
      _texture = texture;

      ShowRectangle = false;
    }

    public Sprite(GraphicsDevice graphicsDevice, Texture2D texture)
      : this(texture)
    {
      SetRectangleTexture(graphicsDevice, texture);
    }

    private void SetRectangleTexture(GraphicsDevice graphicsDevice, Texture2D texture)
    {
      var colours = new List<Color>();

      for (int y = 0; y < texture.Height; y++)
      {
        for (int x = 0; x < texture.Width; x++)
        {
          if (y == 0 || // On the top
              x == 0 || // On the left
              y == texture.Height - 1 || // on the bottom
              x == texture.Width - 1) // on the right
          {
            colours.Add(new Color(255, 255, 255, 255)); // white
          }
          else
          {
            colours.Add(new Color(0, 0, 0, 0)); // transparent 
          }
        }
      }

      _rectangleTexture = new Texture2D(graphicsDevice, texture.Width, texture.Height);
      _rectangleTexture.SetData<Color>(colours.ToArray());
    }

    public override void Update(GameTime gameTime)
    {

    }

    public override void Draw(GameTime gameTime, SpriteBatch spriteBatch)
    {
      spriteBatch.Draw(_texture, Position, Color.White);

      if (ShowRectangle)
      {
        if (_rectangleTexture != null)
          spriteBatch.Draw(_rectangleTexture, Position, Color.Red);
      }
    }
  }
}