using System.Diagnostics;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace BouncyCatIsBouncy.Debugging
{
    static class RadialBBRenderer
    {
        static Texture2D s_radialTexture;
        const float RADIUS = 100f;
        static readonly Vector2 ORIGIN = new Vector2(RADIUS, RADIUS);
        static LineBrush s_brush;
        static bool s_initialized;

        static private void Init(GraphicsDevice device)
        {
            s_radialTexture = DrawingHelper.CreateCircleTexture(device, (int)RADIUS, 3, Color.Blue);
            s_brush = new LineBrush(2, Color.Blue);
            s_brush.Load(device);

            s_initialized = true;
        }

        [Conditional("DEBUG")]
        static public void Draw(SpriteBatch spriteBatch, RadialBB boundingBox)
        {
            Debug.Assert(spriteBatch != null);
            if (!s_initialized)
                Init(spriteBatch.GraphicsDevice);

            var scale = boundingBox.Radius / RADIUS;
            spriteBatch.Draw(s_radialTexture, boundingBox.Center, null, Color.White, 0.0f, ORIGIN, scale, SpriteEffects.None, 1.0f);

            const float LENGTH = 10.0f;
            s_brush.Draw(spriteBatch, boundingBox.Center + new Vector2(LENGTH, 0f), boundingBox.Center - new Vector2(LENGTH, 0f));
            s_brush.Draw(spriteBatch, boundingBox.Center + new Vector2(0f, LENGTH), boundingBox.Center - new Vector2(0f, LENGTH));
        }
    }
}