/*******************************************************************************
 *    Copyright (c) 2010 Eteration A.S. and others.
 *    All rights reserved. This program and the accompanying materials
 *    are made available under the terms of the Eclipse Public License v1.0
 *    which accompanies this distribution, and is available at
 *    http://www.eclipse.org/legal/epl-v10.html
 *    
 *     Contributors:
 *        IBM Corporation - initial API and implementation
 *           - This code is based on WTP SDK frameworks and Tomcat Server Adapters
 *           org.eclipse.jst.server.core
 *           org.eclipse.jst.server.ui
 *           
 *       Naci Dai and Murat Yener, Eteration A.S. 
 *******************************************************************************/
package org.eclipse.libra.framework.core;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * Helper class to route trace output.
 */
public class Trace {
	public static final byte CONFIG = 0;
	public static final byte WARNING = 1;
	public static final byte SEVERE = 2;
	public static final byte FINEST = 3;
	public static final byte FINER = 4;
	
	private static final String[] levelNames = new String[] {
		"CONFIG   ", "WARNING  ", "SEVERE   ", "FINER    ", "FINEST   "};
	private static final String spacer = "                                   ";
	
	private static final SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yy HH:mm.ss.SSS");
	
	static int pluginLength = -1;

	/**
	 * Trace constructor comment.
	 */
	private Trace() {
		super();
	}

	/**
	 * Trace the given text.
	 *
	 * @param level the trace level
	 * @param s a message
	 */
	public static void trace(byte level, String s) {
		Trace.trace(level, s, null);
	}

	/**
	 * Trace the given message and exception.
	 *
	 * @param level the trace level
	 * @param s a message
	 * @param t a throwable
	 */
	public static void trace(byte level, String s, Throwable t) {
		if (!FrameworkCorePlugin.getDefault().isDebugging())
			return;

		trace(FrameworkCorePlugin.PLUGIN_ID, level, s, t);
	}

	/**
	 * Trace the given message and exception.
	 *
	 * @param level a trace level
	 * @param s a message
	 * @param t a throwable
	 */
	private static void trace(String pluginId, int level, String s, Throwable t) {
		if (pluginId == null || s == null)
			return;

		if (!FrameworkCorePlugin.getDefault().isDebugging())
			return;
		
		StringBuffer sb = new StringBuffer(pluginId);
		if (pluginId.length() > pluginLength)
			pluginLength = pluginId.length();
		else if (pluginId.length() < pluginLength)
			sb.append(spacer.substring(0, pluginLength - pluginId.length()));
		sb.append(" ");
		sb.append(levelNames[level]);
		sb.append(" ");
		sb.append(sdf.format(new Date()));
		sb.append(" ");
		sb.append(s);
		//Platform.getDebugOption(ServerCore.PLUGIN_ID + "/" + "resources");

		System.out.println(sb.toString());
		if (t != null)
			t.printStackTrace();
	}
	
	/**
	 * Gets state of debug flag for the plug-in.
	 * 
	 * @return true if tracing is enabled
	 */
	public static boolean isTraceEnabled() {
		return FrameworkCorePlugin.getDefault().isDebugging();
	}
}