/*
 * (c) Copyright 2010-2011 AgileBirds
 *
 * This file is part of OpenFlexo.
 *
 * OpenFlexo 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 3 of the License, or
 * (at your option) any later version.
 *
 * OpenFlexo 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 OpenFlexo. If not, see <http://www.gnu.org/licenses/>.
 *
 */
package org.openflexo.toolbox;

import java.io.IOException;

import org.openflexo.toolbox.WinRegistryAccess.ConsoleReader;

/**
 * @author gpolet
 * 
 */
public class WindowsCommandRetriever {
	/**
	 * 
	 * @param extension
	 *            the file extension (with or without the preceding '.')
	 * @return the command to execute for the specified <code>extension</code> or null if there are no associated command
	 */
	public static String commandForExtension(String extension) {
		String regKey = "HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\FileExts\\" + extension;
		String fileType = WinRegistryAccess.getRegistryValue(regKey, "ProgID", WinRegistryAccess.REG_SZ_TOKEN);
		if (fileType == null) {
			StringBuilder sb = new StringBuilder("cmd /C assoc ");
			sb.append(extension.startsWith(".") ? extension : "." + extension);

			ConsoleReader reader;
			try {
				Process process = Runtime.getRuntime().exec(sb.toString());
				reader = new ConsoleReader(process.getInputStream());
				reader.start();
				process.waitFor();
				reader.join();
			} catch (IOException e) {
				e.printStackTrace();
				return null;
			} catch (InterruptedException e) {
				e.printStackTrace();
				return null;
			}
			String result = reader.getResult();
			if (result.indexOf("=") > -1) {
				fileType = result.substring(result.indexOf("=") + 1).trim();
			}
		}
		if (fileType == null) {
			return null;
		}
		return getCommandForFileType(fileType);
	}

	public static String getCommandForFileType(String fileType) {
		String path = "HKEY_CLASSES_ROOT\\" + fileType + "\\shell\\open\\command";
		return WinRegistryAccess.getRegistryValue(path, null, WinRegistryAccess.REG_SZ_TOKEN);
	}
}