using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace BouncyCatIsBouncy.Debugging
{
    static class DrawingHelper
    {
        public static Texture2D CreateLineTexture(GraphicsDevice graphicss, int lineThickness, Color color)
        {
            Texture2D texture2D = new Texture2D(graphicss, 2, lineThickness + 2, 1, TextureUsage.None, SurfaceFormat.Color);

            int count = 2 * (lineThickness + 2);
            Color[] colorArray = new Color[count];
            colorArray[0] = Color.TransparentWhite;
            colorArray[1] = Color.TransparentWhite;

            for (int i = 2; i < count - 2; i++)
            {
                colorArray[i] = color;
            }

            colorArray[count - 2] = Color.TransparentWhite;
            colorArray[count - 1] = Color.TransparentWhite;
            texture2D.SetData(colorArray);
            return texture2D;
        }

        public static Texture2D CreateCircleTexture(GraphicsDevice graphics, int radius, int borderWidth, Color borderColor)
        {
            Color color = Color.TransparentWhite;

            int y = -1;
            int diameter = radius + radius;
            Vector2 center = new Vector2(radius);

            Texture2D circle = new Texture2D(graphics, diameter, diameter, 1, TextureUsage.None, SurfaceFormat.Color);
            Color[] colors = new Color[diameter * diameter];

            for (int i = 0; i < colors.Length; i++)
            {
                int x = i % diameter;
                if (x == 0)
                    y += 1;

                Vector2 diff = new Vector2(x, y) - center;
                float length = diff.Length();

                if (length > radius)
                {
                    colors[i] = Color.TransparentBlack;
                }
                else if (length >= radius - borderWidth)
                {
                    colors[i] = borderColor;
                }
                else
                {
                    colors[i] = color;
                }
            }
            circle.SetData(colors);
            return circle;
        }
    }
}