/******************************************************************************
 * Product: Adempiere ERP & CRM Smart Business Solution                       *
 * Copyright (C) 1999-2006 ComPiere, Inc. All Rights Reserved.                *
 * This program is free software; you can redistribute it and/or modify it    *
 * under the terms version 2 of the GNU General Public License as published   *
 * by the Free Software Foundation. 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.                     *
 * For the text or an alternative of this public license, you may reach us    *
 * ComPiere, Inc., 2620 Augustine Dr. #245, Santa Clara, CA 95054, USA        *
 * or via info@compiere.org or http://www.compiere.org/license.html           *
 *****************************************************************************/
package org.compiere.util;

/**
 *	Amount in Words for English
 *	
 *  @author Jorg Janke - http://www.rgagnon.com/javadetails/java-0426.html
 *  @version $Id: AmtInWords_EN.java,v 1.3 2006/07/30 00:54:35 jjanke Exp $
 */
public class AmtInWords_EN implements AmtInWords
{
	/**
	 * 	AmtInWords_EN
	 */
	public AmtInWords_EN ()
	{
		super ();
	}	//	AmtInWords_EN

	/** Thousands plus				*/
	private static final String[]	majorNames	= {
		"", 
		"Thousand ", 
		"Million ",
		"Billion ", 
		"Trillion ", 
		"Quadrillion ",
		"Quintillion "
	};

	/** Ten to Ninety				*/
	private static final String[]	tensNames	= { 
		"", 
		"Ten ", 
		"Twenty ",
		"Thirty ", 
		"Forty ", 
		"Fifty ", 
		"Sixty ", 
		"Seventy ",
		"Eighty ", 
		"Ninety "
	};

	/** numbers to 19				*/
	private static final String[]	numNames	= { 
		"", 
		"One ", 
		"Two ",
		"Three ", 
		"Four ", 
		"Five ", 
		"Six ", 
		"Seven ", 
		"Eight ", 
		"Nine ",
		"Ten ", 
		"Eleven ", 
		"Twelve ", 
		"Thirteen ", 
		"Fourteen ", 
		"Fifteen ",
		"Sixteen ", 
		"Seventeen ", 
		"Eighteen ", 
		"Nineteen "
	};

	/**
	 * 	Convert Less Than One Thousand
	 *	@param number
	 *	@return amt
	 */
	private String convertLessThanOneThousand (int number)
	{
		String soFar;
		//	Below 20
		if (number % 100 < 20)
		{
			soFar = numNames[number % 100];
			number /= 100;
		}
		else
		{
			soFar = numNames[number % 10];
			number /= 10;
			soFar = tensNames[number % 10] + soFar;
			number /= 10;
		}
		if (number == 0)
			return soFar;
		return numNames[number] + "Hundred " + soFar;
	}	//	convertLessThanOneThousand

	/**
	 * 	Convert
	 *	@param number
	 *	@return amt
	 */
	private String convert (long number)
	{
		/* special case */
		if (number == 0)
		{
			return "Zero";
		}
		String prefix = "";
		if (number < 0)
		{
			number = -number;
			prefix = "Negative ";
		}
		String soFar = "";
		int place = 0;
		do
		{
			long n = number % 1000;
			if (n != 0)
			{
				String s = convertLessThanOneThousand ((int)n);
				soFar = s + majorNames[place] + soFar;
			}
			place++;
			number /= 1000;
		}
		while (number > 0);
		return (prefix + soFar).trim ();
	}	//	convert
	
	/**
	 * 	Get Amount in Words
	 * 	@param amount numeric amount (352.80)
	 * 	@return amount in words (three*five*two 80/100)
	 * 	@throws Exception
	 */
	@Override
	public String getAmtInWords (String amount) throws Exception
	{
		if (amount == null)
			return amount;
		//
		StringBuilder sb = new StringBuilder ();
		int pos = amount.lastIndexOf ('.');
		int pos2 = amount.lastIndexOf (',');
		if (pos2 > pos)
			pos = pos2;
		String oldamt = amount;
		amount = amount.replace(",", "");
		int newpos = amount.lastIndexOf ('.');
		long dollars = Long.parseLong(amount.substring (0, newpos));
		sb.append (convert (dollars));
		for (int i = 0; i < oldamt.length (); i++)
		{
			if (pos == i) //	we are done
			{
				String cents = oldamt.substring (i + 1);
				sb.append (' ').append (cents).append ("/100");
				break;
			}
		}
		return sb.toString ();
	}	//	getAmtInWords

	/**
	 * 	Test Print
	 *	@param amt amount
	 */
	private void print (String amt)
	{
		try
		{
			System.out.println(amt + " = " + getAmtInWords(amt));
		}
		catch (Exception e)
		{
			e.printStackTrace();
		}
	}	//	print
	
	/**
	 * 	Test
	 *	@param args ignored
	 */
	public static void main (String[] args)
	{
		AmtInWords_EN aiw = new AmtInWords_EN();
		aiw.print ("0.23");
		aiw.print ("1.23");
		aiw.print ("12.345");
		aiw.print ("123.45");
		aiw.print ("1234.56");
		aiw.print ("12345.78");
		aiw.print ("123457.89");
		aiw.print ("1,234,578.90");
	}	//	main
	
}	//	AmtInWords_EN
