/*******************************************************************************
 * Copyright (c) 2011-2014 Fernando Petrola
 *
 * This file is part of Dragome SDK.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 ******************************************************************************/
package com.dragome.web.serverside.servlets;

import java.io.File;
import java.io.IOException;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.dragome.commons.compiler.classpath.Classpath;
import com.dragome.services.ServiceLocator;
import com.dragome.services.WebServiceLocator;
import com.dragome.web.serverside.compile.watchers.DirectoryWatcher;

//@WebServlet(loadOnStartup= 1, value= "/compiler-service")
public class CompilerServlet extends GetPostServlet
{
	private static Logger LOGGER= Logger.getLogger(CompilerServlet.class.getName());

	protected void doService(HttpServletRequest req, HttpServletResponse resp) throws IOException
	{
		resp.getWriter().write(DirectoryWatcher.lastCompilation + "");
	}

	public void init() throws ServletException
	{
		try
		{
			WebServiceLocator webServiceLocator= WebServiceLocator.getInstance();
			compile();
		}
		catch (URISyntaxException e)
		{
			throw new RuntimeException(e);
		}
	}

	private void compile() throws URISyntaxException
	{
		ClassLoader c= getClass().getClassLoader();
		final Classpath classPath= new Classpath();
		if (c instanceof URLClassLoader)
		{
			URLClassLoader urlClassLoader= (URLClassLoader) c;
			URL[] urls= urlClassLoader.getURLs();
			String classesFolder= "";
			for (URL i : urls)
			{
				String classPathEntry= new File(i.toURI()).toString();
				boolean isClassesFolder= i.toString().endsWith("/classes/") || i.toString().endsWith("/classes");
				boolean addToClasspath= ServiceLocator.getInstance().getConfigurator().filterClassPath(classPathEntry);

				if (addToClasspath)
					classPath.addEntry(classPathEntry);

				if (isClassesFolder)
					classesFolder= classPathEntry;

				LOGGER.log(Level.INFO, "classpath entry: " + classPathEntry);
			}

			String compiledDir= ServiceLocator.getInstance().getConfigurator().getCompiledPath();

			if (compiledDir == null) // if path is not set use the /classes path
				compiledDir= new File(new java.io.File(classesFolder).getParentFile().getParentFile().toURI()).toString();

			final String path= compiledDir + File.separator + "compiled-js";

			LOGGER.log(Level.INFO, "classes: " + path);

			final String classesFolder2= classesFolder;

			new Thread()
			{
				public void run()
				{
					DirectoryWatcher.startWatching(new String[] { "-r", classesFolder2 }, classPath, path);
				}
			}.start();
		}
		else
			LOGGER.log(Level.SEVERE, "Cannot start compiler because there is no URLClassLoader available");
	}
}