namespace Volian.Controls.Library
{
	public static class RomanNumeral
	{
		private enum RomanOffset : int
		{
			Hundreds = 2,
			Tens = 4,
			Units = 6
		}
		private static readonly string _Romans = "MDCLXVI";
		private static string RomanPart(RomanOffset offset, int value)
		{
			int iFive = value / 5;
			int iUnits = value % 5;
			int iFour = iUnits / 4;
			return _Romans.Substring(((int)offset), iFour) +
				_Romans.Substring(((int)offset) - iFive - iFour, iFive | iFour) + 
				"".PadRight(iUnits % 4, _Romans[((int)offset)]);
		}
		public static string Convert(int number)
		{
			int thousands = number / 1000;
			int hundreds = (number % 1000) / 100;
			int tens = (number % 100) / 10;
			int units = number % 10;
			return "".PadRight(thousands, _Romans[0]) + 
				RomanPart(RomanOffset.Hundreds, hundreds) + 
				RomanPart(RomanOffset.Tens, tens) + 
				RomanPart(RomanOffset.Units, units);
		}
	}
}