/*
 * Rapid Beans Framework, SDK, Ant Tasks: PlatformHelper.java
 * 
 * Copyright (C) 2009 Martin Bluemel
 * 
 * Creation Date: 12/07/2008
 * 
 * This program 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 3 of the License, or (at your option) any later version.
 * This program 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 copies of the GNU Lesser General Public License and the
 * GNU General Public License along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

package org.rapidbeans.ant;

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.LineNumberReader;

import org.apache.tools.ant.BuildException;

/**
 * Operating system recognition and operating system specific services. Could
 * also contain some detection for the virtual platform later on.
 * 
 * @author Martin Bluemel
 */
public final class PlatformHelper {

	private static OperatingSystem os = null;

	private static Version osVersion = null;

	/**
	 * @return the current operating system
	 */
	public static OperatingSystem getOs() {
		return os;
	}

	/**
	 * @return the current operating system's version
	 */
	public static Version getOsVersion() {
		return osVersion;
	}

	/**
	 * @return the operation system name
	 */
	public static String getOsName() {
		return System.getProperty("os.name");
	}

	// initializer
	static {
		final String osName = System.getProperty("os.name");
		osVersion = new Version(System.getProperty("os.version"));
		if (osName.equals("Linux")) {
			os = OperatingSystem.linux;
		} else if (osName.startsWith("Windows")) {
			os = OperatingSystem.windows;
		} else if (osName.startsWith("Mac")) {
			os = OperatingSystem.mac;
		}
	}

	/**
	 * @return the operation system specific line feed string.
	 */
	public static String getLineFeed() {
		switch (os) {
		case windows:
			return "\r\n";
		default:
			return "\n";
		}
	}

	/**
	 * Determines the host name via system command 'hostname' available on every
	 * Unix, Windows and hopefully also Mac.
	 * 
	 * @return the host name
	 */
	public static String hostname() {
		LineNumberReader reader = null;
		try {
			final Process proc = Runtime.getRuntime().exec("hostname");
			proc.waitFor();
			reader = new LineNumberReader(new InputStreamReader(proc.getInputStream()));
			return reader.readLine().trim();
		} catch (InterruptedException e) {
			throw new BuildException(e);
		} catch (IOException e) {
			throw new BuildException(e);
		} finally {
			if (reader != null) {
				try {
					reader.close();
				} catch (IOException e) {
					throw new BuildException(e);
				}
			}
		}
	}

	/**
	 * @return the current user name from system property user.name
	 */
	public static String username() {
		String str = System.getProperty("user.name");
		return str;
	}
}