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

namespace Tutorial005
{
  public class Sprite
  {
    private Texture2D _texture;

    private float _rotation;

    public Vector2 Position;

    /// <summary>
    /// The point we rotate on
    /// </summary>
    public Vector2 Origin;

    /// <summary>
    /// The speed of the rotation
    /// </summary>
    public float RotationVelocity = 3f;

    /// <summary>
    /// The speed of moving forward
    /// </summary>
    public float LinearVelocity = 4f;

    public Sprite(Texture2D texture)
    {
      _texture = texture;
    }

    public void Update()
    {
      if (Keyboard.GetState().IsKeyDown(Keys.A))
        _rotation -= MathHelper.ToRadians(RotationVelocity);
      else if (Keyboard.GetState().IsKeyDown(Keys.D))
        _rotation += MathHelper.ToRadians(RotationVelocity);

      var direction = new Vector2((float)Math.Cos(MathHelper.ToRadians(90) - _rotation), -(float)Math.Sin(MathHelper.ToRadians(90) - _rotation));

      if (Keyboard.GetState().IsKeyDown(Keys.W))
        Position += direction * LinearVelocity;
    }

    public void Draw(SpriteBatch spriteBatch)
    {
      spriteBatch.Draw(_texture, Position, null, Color.White, _rotation, Origin, 1, SpriteEffects.None, 0f);
    }
  }
}