/*
 * Moonlight|3D
 * Copyright (C) 2007 The Moonlight|3D team
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Created on Sep 20, 2007
 */

package eu.moonlight3d.ant;

import java.io.File;
import java.util.ArrayList;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class BuildPluginListTask extends Task {
	
	public class PluginDef extends Task {
		public String filename;
		public String classname; 
		
		public void setFilename(String filename) {
			this.filename=filename;
		}
		
		public void setClassname(String classname) {
			this.classname=classname;
		}
	}
	
	private ArrayList<PluginDef> pluginDefs;
	
	private String filename;
	
	public BuildPluginListTask() {
		pluginDefs=new ArrayList<PluginDef>();
	}
	
	public PluginDef createPluginDef() {
		PluginDef pluginDef=new PluginDef();
		pluginDefs.add(pluginDef);
		return pluginDef;
	}
	
	public void setFilename(String filename) {
		this.filename=filename;
	}
	
	public void execute() {
		// TODO
		if(pluginDefs.size()==0) {
			throw new BuildException("refusing to build empty plugin list file");
		}
		
		try {
			Document document=DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();
			
			Element plugins=document.createElement("plugins");
			
			for(PluginDef pluginDef : pluginDefs) {
				Element classpath=document.createElement("classpath");				
				classpath.setAttribute("location", pluginDef.filename);
				
				Element plugin=document.createElement("plugin");
				plugin.setAttribute("className",pluginDef.classname);
				
				plugins.appendChild(classpath);
				plugins.appendChild(plugin);
			}

			document.appendChild(plugins);
			
            Source domSource=new DOMSource(document);
            Result streamResult=new StreamResult(new File(filename));
            Transformer transformer=TransformerFactory.newInstance().newTransformer();
            transformer.setOutputProperty("indent","yes");
            transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
            
            transformer.transform(domSource,streamResult);
		} catch (Exception e) {
			// rethrow anything that happens in this block as BuildException
			throw new BuildException(e);
		}
		
	}
}