using System.Windows.Media;

namespace ColorPicker
{
	public class ColorConverter
	{
		public static Color HSLtoRGB(double hue, double saturation, double luminance)
		{
			int Max, Mid, Min;
			double q;

			Max = Round(luminance * 255);
			Min = Round((1.0 - saturation) * (luminance / 1.0) * 255);
			q = (double)(Max - Min) / 255;

			if (hue >= 0 && hue <= (double)1 / 6)
			{
				Mid = Round(((hue - 0) * q) * 1530 + Min);
				return Color.FromArgb(255, (byte)Max, (byte)Mid, (byte)Min);
			}
			else if (hue <= (double)1 / 3)
			{
				Mid = Round(-((hue - (double)1 / 6) * q) * 1530 + Max);
				return Color.FromArgb(255, (byte)Mid, (byte)Max, (byte)Min);
			}
			else if (hue <= 0.5)
			{
				Mid = Round(((hue - (double)1 / 3) * q) * 1530 + Min);
				return Color.FromArgb(255, (byte)Min, (byte)Max, (byte)Mid);
			}
			else if (hue <= (double)2 / 3)
			{
				Mid = Round(-((hue - 0.5) * q) * 1530 + Max);
				return Color.FromArgb(255, (byte)Min, (byte)Mid, (byte)Max);
			}
			else if (hue <= (double)5 / 6)
			{
				Mid = Round(((hue - (double)2 / 3) * q) * 1530 + Min);
				return Color.FromArgb(255, (byte)Mid, (byte)Min, (byte)Max);
			}
			else if (hue <= 1.0)
			{
				Mid = Round(-((hue - (double)5 / 6) * q) * 1530 + Max);
				return Color.FromArgb(255, (byte)Max, (byte)Min, (byte)Mid);
			}
			else
			{
				return Color.FromArgb(255, (byte)0, (byte)0, (byte)0);
			}
		}
		private static int Round(double val)
		{
			int ret_val = (int)val;

			int temp = (int)(val * 100);

			if ((temp % 100) >= 50)
			{
				ret_val += 1;
			}

			return ret_val;
		}
	}
}