/******************************************************************************
 * 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.impexp;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PipedReader;
import java.io.PipedWriter;
import java.util.logging.Level;

import org.compiere.util.CLogger;

/**
 *	Covert OFX 1XX (SQGML) into valid XML.
 *  <p>
 *  SGML BASED OFX 1 compliant data is read from the BufferedReader
 *  passed to init. This class extends InputStream, allowing the
 *  XML compliant output data to be read from it.
 *
 *  @author Maarten Klinker
 * 	@version $Id: OFX1ToXML.java,v 1.3 2006/07/30 00:51:05 jjanke Exp $
 */
public final class OFX1ToXML extends InputStream implements Runnable
{
 	/**	Reader object					*/
	private PipedReader m_reader = new PipedReader();
	/**	Writer object					*/
	private BufferedWriter m_writer;
	/**	Temp String					*/
	private String m_ofx = "";

	/**	Logger			*/
	private static final CLogger	log = CLogger.getCLogger(OFX1ToXML.class);
	
	/**
	 * Constructor for OFX1ToXML
	 * @param is InputStream
	 * @throws IOException
	 */
	public OFX1ToXML(InputStream is) throws IOException
	{
		BufferedReader br = new BufferedReader(new InputStreamReader(is));
		init(br);
	}	//	OFX1ToXML
	
	/**
	 * Constructor for OFX1ToXML
	 * @param br BufferedReader
	 * @throws IOException
	 */
	public OFX1ToXML(BufferedReader br) throws IOException
	{
		init(br);	
	}	//	OFX1ToXML
	
	/**
	 * Method init
	 * @param br BufferedReader
	 * @throws IOException
	 */
	public void init(BufferedReader br) throws IOException
	{
		m_writer = new BufferedWriter(new PipedWriter(m_reader));
		String line = br.readLine();

		write("<?xml version=\"1.0\"?>\n");
		write("<?OFX ");
		while(line.indexOf('<') != 0)
		{
			if (line.length() > 0) 
			{
				write(line.replaceAll(":", "=\"") + "\" ");
			}
			line = br.readLine();
		}
		write("?>\n");

		while(line != null)
		{
			m_ofx += line + "\n";
			line = br.readLine();
		}
		br.close();

		new Thread(this).start();
	}	//i	nit

	/**
	 * Method run
	 * @see java.lang.Runnable#run()
	 */
	@Override
	public void run()
	{
		boolean addCloseTag;
		int tag2Start;
		int tagStart;
		int tagEnd;
		String tag;
		String line = "";

		try
		{
			while(!m_ofx.equals(""))
			{
				addCloseTag = false;
				tagStart = m_ofx.indexOf('<');
				if (tagStart == -1) 
				{
					break;
				}
				tagEnd = m_ofx.indexOf('>');
				if (tagEnd <= tagStart + 1) 
				{
					throw new IOException("PARSE ERROR: Invalid tag");
				}
				tag = m_ofx.substring(tagStart + 1, tagEnd);
				if (tag.indexOf(' ') != -1) 
				{
					throw new IOException("PARSE ERROR: Invalid tag");
				}
				if (!tag.startsWith("/")) 
				{
					addCloseTag = (m_ofx.indexOf("</"+tag+">") == -1);
				}
				tag2Start = m_ofx.indexOf("<", tagEnd);
				if (m_ofx.indexOf("\n", tagEnd) < tag2Start) 
				{
					tag2Start = m_ofx.indexOf("\n", tagEnd);
				}
				if (tag2Start == -1) 
				{
					tag2Start = m_ofx.length();
				}
				
				String data=m_ofx.substring(tagEnd+1, tag2Start);
				line = m_ofx.substring(0, tagEnd+1)+xmlEncodeTextAsPCDATA(data);
				
				m_ofx = m_ofx.substring(tag2Start);
				if (addCloseTag) 
				{
					line += "</" + tag + ">";
				}
				write(line);
			}
			write(m_ofx);
			m_writer.close();
		}
		catch (IOException e)
		{
			log.log(Level.SEVERE, "Ofx1To2Convertor: IO Exception", e);
		}
	}	//	run

	/**
	 * Method write
	 * @param str String
	 * @throws IOException
	 */
	private void write(String str) throws IOException
	{
		m_writer.write(str, 0, str.length());
	}	//	write

	/**
	 * Method read
	 * @return int
	 * @throws IOException
	 */
	@Override
	public int read() throws IOException
	{
		return m_reader.read();
	}	//	read

	/**
	 * Method read
	 * @param cbuf char[]
	 * @param off int
	 * @param len int
	 * @return int
	 * @throws IOException
	 */
	public int read(char[] cbuf, int off, int len) throws IOException
	{
		return m_reader.read(cbuf, off, len);
	}	//	read
	
	/**
	 *	Encodes strings for XML
	 * 	@param text text	
	 *	@return string
	 */
	 public final static String xmlEncodeTextAsPCDATA(String text) 
	 {
		if (text == null)
			return null;
		char c;
		StringBuilder n = new StringBuilder (text.length () * 2);
		for (int i = 0; i < text.length (); i++)
		{
			c = text.charAt (i);
			switch (c)
			{
				case '&':
					n.append ("&amp;");
					break;
				case '<':
					n.append ("&lt;");
					break;
				case '>':
					n.append ("&gt;");
					break;
				case '"':
					n.append ("&quot;");
					break;
				case '\'':
					n.append ("&apos;");
					break;
				default:
				{
					n.append (c);
					break;
				}
			}
		}
		return n.toString ();
	}	//	xmlEncodeTextAsPCDATA
	 

}	//Ofx1To2Convertor