using System;
using System.Collections.Generic;
using System.Text;

namespace Volian.Controls.Library
{
	public static class RomanNumeral
	{
		private static readonly log4net.ILog _MyLog = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
		private enum RomanOffset : int
		{
			Hundreds = 2,
			Tens = 4,
			Units = 6
		}
		private static 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);
		}
	//  private static int[] _TestRomans = new int[] {
	//    1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,25,30,40,50,60,69,70,80,90,99,
	//    100,200,400,500,600,666,700,800,900,1000,1444,1666,1945,1997,1999,2000,2007,3000
	//  };
	//  public static void ShowRomans()
	//  {
	//    for (int i = 0; i < _TestRomans.Length; i++)
	//    {
		//      if(_MyLog.IsInfoEnabled)_MyLog.InfoFormat("{0},{1}", _TestRomans[i], Convert(_TestRomans[i]));
	//    }
		//    //if(_MyLog.IsInfoEnabled)_MyLog.InfoFormat("{0},{1}", 4, Convert(4));
		//    //if(_MyLog.IsInfoEnabled)_MyLog.InfoFormat("{0},{1}", 5, Convert(5));
		//    //if(_MyLog.IsInfoEnabled)_MyLog.InfoFormat("{0},{1}", 6, Convert(6));
		//    //if(_MyLog.IsInfoEnabled)_MyLog.InfoFormat("{0},{1}", 8, Convert(8));
		//    //if(_MyLog.IsInfoEnabled)_MyLog.InfoFormat("{0},{1}", 9, Convert(9));
	//  }
	}
}