/**
 * GEDCOM 5.5 <-> XML representation converter, based on GenJ API
 *
 * Copyright (C) 2005 Werner Bailer <werner@wbailer.com>
 *
 * This piece of code 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 code 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
 * 
 */

import genj.gedcom.*;
import genj.io.*;
import java.io.*;
import java.nio.charset.Charset;
import java.nio.charset.UnsupportedCharsetException;
import java.util.Collection;
import java.util.Iterator;

import javax.xml.parsers.*;
import org.w3c.dom.*;

import genj.util.Origin;

import org.apache.xerces.parsers.*;
import org.xml.sax.*;

public class GedcomDOMReader extends GedcomReader {

  private Gedcom              gedcom;
  private BufferedReader      in;

  private Origin origin;
  private Thread worker;
  private Object lock = new Object();

  public GedcomDOMReader(Origin org) throws IOException {
       
    super(org); 
       
    // open origin
    InputStream oin = org.open();
    
    // init some data
    in       = new BufferedReader(new InputStreamReader(oin, Charset.forName("ISO-8859-1")));
    origin   = org;
    gedcom   = new Gedcom(origin);
    gedcom.setEncoding(Gedcom.LATIN1);
    
    // Done
  }
  
  public void setGedcom(Gedcom gedcom) {
  	this.gedcom = gedcom;
  }
  
  public Gedcom read() throws GedcomIOException, GedcomFormatException {

    // Remember working thread
    synchronized (lock) {
      worker=Thread.currentThread();
    }
    
    // try it
    try {
    	
      DOMParser domParser = new DOMParser();
      
      InputSource ips = new InputSource(in);
    
      domParser.parse(ips);
      
      Document doc = domParser.getDocument();
      
      Element rootElem = doc.getDocumentElement();
      
      if (!rootElem.getTagName().equals("GEDCOM")) throw new GedcomIOException("XML root tag is not GEDCOM", 0);
      
	  parseProperty(doc,rootElem,gedcom,null);
    
      //readGedcom();
      return gedcom;
    } catch (Exception e) {
    	e.printStackTrace();
      throw new GedcomIOException(e.getMessage(), 0);
    } finally  {
      // close in
      try { in.close(); } catch (Throwable t) {};
      // forget working thread
      synchronized (lock) {
        worker=null;
      }
    }

    // nothing happening here
  }
  
  
  protected void parseProperty(Document doc, Element propertyElem, Gedcom gedcom, Property prop) throws GedcomException
  {
  	String tag = propertyElem.getTagName();
  	
  	Property newProperty = null;
  		
  	if (!tag.equals("GEDCOM")) {
	  	String id = null;
	  	String value = null;
	  	
	  	if (propertyElem.hasAttribute("id")) id = propertyElem.getAttribute("id");
	  	if (propertyElem.hasAttribute("value")) value = propertyElem.getAttribute("value");
	  		  	
	  	// if we are on top level, create an entity
	  	if (prop == null) {
	  		genj.gedcom.Entity entity = gedcom.createEntity(tag,id);
	  		newProperty = entity;
	  	}
	  	else {
	  		// get tag path to parent
	  		TagPath tagpath = prop.getPath();
	  		tagpath = new TagPath(tagpath,tag);
	  		
	  		// get meta-property
	  		MetaProperty mp = MetaProperty.get(tagpath);
	  		
	  		if (value == null) value = "";
	  		newProperty = mp.create(value);
	  		prop.addProperty(newProperty);
	  	}
  	
  	}
  	// iterate through children
  	
  	Node childNode = propertyElem.getFirstChild();
  	Element child = null;
	
	while (childNode != null) {
		if (childNode instanceof Element) {
			child = (Element) childNode;
  			parseProperty(doc,child,gedcom,newProperty);
		}
		
  		childNode = childNode.getNextSibling();
  		
  	}
  	
  }
  
  
} //GedcomDOMReader