/*******************************************************************************

 * Copyright (c) 2009 Symbian Foundation and/or its subsidiary(-ies).

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of the License "Eclipse Public License v1.0"

 * which accompanies this distribution, and is available

 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

 *

 * Initial Contributors:

 * Symbian Foundation - initial contribution.

 * Contributors:

 * Description:

 * Overview:

 * Details:

 * Platforms/Drives/Compatibility:

 * Assumptions/Requirement/Pre-requisites:

 * Failures and causes:

 *******************************************************************************/

package org.symbian.tools.wrttools.debug.internal.web;

import java.io.IOException;

import java.io.InputStream;

import java.io.UnsupportedEncodingException;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.URLDecoder;

import java.net.URLEncoder;

import java.util.StringTokenizer;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.eclipse.core.resources.IFile;

import org.eclipse.core.resources.IResource;

import org.eclipse.core.resources.ResourcesPlugin;

import org.eclipse.core.runtime.CoreException;

import org.eclipse.core.runtime.IPath;

import org.eclipse.core.runtime.Path;

import org.symbian.tools.wrttools.debug.internal.Activator;

public class WorkspaceResourcesServlet extends HttpServlet {

	private static final long serialVersionUID = -3217197074249607950L;

	@Override

	protected void doGet(HttpServletRequest req, HttpServletResponse resp)

			throws ServletException, IOException {

		IFile file = ResourcesPlugin.getWorkspace().getRoot().getFile(

				new Path(req.getPathInfo()));

		if (file.isAccessible()) {

			InputStream contents = null;

			try {

				contents = file.getContents();

				byte[] buf = new byte[4048];

				int i;

				while ((i = contents.read(buf)) >= 0) {

					resp.getOutputStream().write(buf, 0, i);

				}

			} catch (CoreException e) {

				Activator.log(e);

			} finally {

				if (contents != null) {

					contents.close();

				}

			}

		} else {

			resp.setStatus(HttpServletResponse.SC_NOT_FOUND);

		}

	}

	public static String getHttpUrl(IResource file) {

		try {

			String path = WebappManager.WORKSPACE_RESOURCES_CONTEXT

					+ (file != null ? encode(file.getFullPath()) : "/");

			URL url = new URL("http", WebappManager.getHost(), WebappManager

					.getPort(), path);

			return url.toString();

		} catch (MalformedURLException e) {

			return file.getLocationURI().toString();

		}

	}

	private static String encode(IPath fullPath) {

		try {

			StringBuffer result = new StringBuffer();

			String[] segments = fullPath.segments();

			for (int i = 0; i < segments.length; i++) {

				String string = segments[i];

				result.append("/");

				// java.net.URLEncoder encodes " " as "+" while Chrome needs "%20"

				StringTokenizer tokenizer = new StringTokenizer(string, " ", false);

				while (tokenizer.hasMoreElements()) {

					result.append(URLEncoder.encode(tokenizer.nextToken(),

							"UTF-8"));

					if (tokenizer.hasMoreTokens()) {

						result.append("%20");

					}

				}

			}

			return result.toString();

		} catch (UnsupportedEncodingException e) {

			// Something is horribly wrong - JRE doesn't have UTF8?

			throw new RuntimeException(e);

		}

	}

	public static IFile getFileFromUrl(String name) {

		try {

			String root = getHttpUrl(null);

			IFile file = null;

			if (name.startsWith(root)) {

				String fileName = name.substring(root.length());

				fileName = URLDecoder.decode(fileName, "UTF-8");

				final IPath path = new Path(fileName);

				file = ResourcesPlugin.getWorkspace().getRoot().getFile(path);

				if (!file.isAccessible()) {

					return null;

				}

			}

			return file;

		} catch (UnsupportedEncodingException e) {

			throw new RuntimeException(e);

		}

	}

}