///
///
/// Copyright (C) 2006  Lennart Lopin <novalis78 [at] gmx.net> 
/// All Rights Reserved.
///
/// This program is free software; you can redistribute it and/or
/// modify it under the terms of the GNU General Public License as
/// published by the Free Software Foundation; either version 2 of the
/// License, or (at your option) any later version.
/// 
/// This program is distributed in the hope that it will be useful, but
/// WITHOUT ANY WARRANTY; without even the implied warranty of
/// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
/// General Public License for more details.
/// 
/// You should have received a copy of the GNU General Public License
/// along with this program; if not, write to the Free Software
/// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
/// 02111-1307, USA.
/// 
///

using System;
using System.Globalization;

namespace Pali
{

	public class PaliComparer : object, System.Collections.IComparer
	{
	    
		/// <summary>
		/// Default constructor - initializes all fields to default values
		/// </summary>
		public PaliComparer()
		{
		}
	    
		/// <summary>
		/// TODO - add method description
		/// </summary>
		/// <remarks>
		/// Interface method from IComparer
		/// 
		/// </remarks>
		/// <param name='x'>TODO - add parameter description</param>
		/// <param name='y'>TODO - add parameter description</param>
		public virtual int Compare(object s1, object s2)
		{
			try
			{
				//get rid of special cases
				if(s1.ToString() == "aā" || s2.ToString() == "aā")
					Console.WriteLine("here he is");
				if((s1 == null) && (s2 == null)) return 0;
				else if(s1 == null) return -1;
				else if(s2 == null) return 1;
				else if(s1 == s2) return 0;

				if((s1.Equals(string.Empty) && (s2.Equals(string.Empty)))) return 0;
				else if(s1.Equals(string.Empty)) return -1;
				else if(s2.Equals(string.Empty)) return -1;
				char[] w1 = s1.ToString().ToCharArray();
				char[] w2 = s2.ToString().ToCharArray();
				for(int i = 0; i < w1.Length && i < w2.Length; i++)
				{
					if(w1[i] != w2[i])
					{
						return mapNumber(w1[i]) < mapNumber(w2[i]) ? -1 : 1;
					}
					else if(i == (w2.Length-1))
					{
						return 1;
					}
					else if(i == (w1.Length-1))
						return -1;
					else
						continue;
				}
			}
			catch(System.Exception ex)
			{
				Console.WriteLine("Error: " + ex.Message.ToString());
			}
			return 0;
			//throw new System.NotImplementedException();
		}

		public int mapNumber(char a)
		{
			switch(a)
			{
				case('a'): return 1;
				case('ā'): return 2;
				case('i'): return 3;
				case('ī'): return 4;
				case('u'): return 5;
				case('ū'): return 6;
				case('e'): return 7;
				case('o'): return 8;

				case('k'): return 9;
				case('g'): return 10;
				case('ṅ'): return 11;
				case('c'): return 12;
				case('j'): return 13;
				case('ñ'): return 14;
				case('ṭ'): return 15;
				case('ḍ'): return 16;
				case('ṇ'): return 17;
				case('t'): return 18;
				case('d'): return 19;
				case('n'): return 20;
				case('p'): return 21;
				case('b'): return 22;
				case('m'): return 23;
				case('y'): return 24;
				case('r'): return 25;
				case('l'): return 26;
				case('v'): return 27;
				case('s'): return 28;
				case('h'): return 29;
				case('ḷ'): return 30;
				case('ṃ'): return 31;
				default: return 0;
			}
		}
	}
}