// $Header: /home/cvs/jakarta-jmeter/src/monitor/components/org/apache/jmeter/visualizers/MonitorHealthPanel.java,v 1.4 2004/03/16 13:56:34 woolfel Exp $
/*
 * Copyright 2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.jmeter.visualizers;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Font;
import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JPanel;

import java.util.HashMap;

import javax.swing.JScrollPane;

import org.apache.jmeter.util.JMeterUtils;
import org.apache.jmeter.samplers.Clearable;
/**
 * The health panel is responsible for showing the health
 * of the servers. It only uses the most current information
 * to show the status.
 */
public class MonitorHealthPanel extends JPanel
	implements MonitorListener, Clearable
{
	private HashMap SERVERMAP = new HashMap();
	private JPanel SERVERS = null;
	private MonitorAccumModel MODEL;
	private JScrollPane SCROLL = null;
	
	Font plainText = new Font("plain", Font.PLAIN, 9);
	public static final String INFO_H =
		JMeterUtils.getResString("monitor_equation_healthy");
	public static final String INFO_A =
		JMeterUtils.getResString("monitor_equation_active");
	public static final String INFO_W =
		JMeterUtils.getResString("monitor_equation_warning");
	public static final String INFO_D =
		JMeterUtils.getResString("monitor_equation_dead");
	public static final String INFO_LOAD =
		JMeterUtils.getResString("monitor_equation_load");

    /**
     * 
     * @deprecated Only for use in unit testing
     */
    public MonitorHealthPanel()
	{
    	//log.warn("Only for use in unit testing");
    }

    /**
     * 
     */
    public MonitorHealthPanel(MonitorAccumModel model)
    {
    	this.MODEL = model;
    	this.MODEL.addListener(this);
        init();
    }

	/**
	 * init is responsible for creating the necessary legends
	 * and information for the health panel.
	 */
	protected void init(){
		this.setLayout(new BorderLayout());
		ImageIcon legend = JMeterUtils.getImage("monitor-legend.gif");
		JLabel label = new JLabel(legend);
		label.setPreferredSize(new Dimension(550,25));
		this.add(label,BorderLayout.NORTH);

		this.SERVERS = new JPanel();
		this.SERVERS.setLayout(new BoxLayout(SERVERS, BoxLayout.Y_AXIS));
		this.SERVERS.setAlignmentX(Component.LEFT_ALIGNMENT);

		SCROLL = new JScrollPane(this.SERVERS);
		SCROLL.setPreferredSize(new Dimension(300,300));
		this.add(SCROLL,BorderLayout.CENTER);
		
		// the equations
		String eqstring1 = " " + INFO_H + "   |   " + INFO_A;
		String eqstring2 = " " + INFO_W + "   |   " + INFO_D;
		String eqstring3 = " " + INFO_LOAD;
		JLabel eqs = new JLabel();
		eqs.setLayout(new BorderLayout());
		eqs.setPreferredSize(new Dimension(500,60));
		eqs.add(new JLabel(eqstring1),BorderLayout.NORTH);
		eqs.add(new JLabel(eqstring2),BorderLayout.CENTER);
		eqs.add(new JLabel(eqstring3),BorderLayout.SOUTH);
		this.add(eqs,BorderLayout.SOUTH);
	}

	/**
	 * 
	 * @param model
	 */
	public void addSample(MonitorModel model){
		if (SERVERMAP.containsKey(model.getURL())){
			ServerPanel pane = null;
			if(SERVERMAP.get(model.getURL()) != null){
				pane = (ServerPanel)SERVERMAP.get((model.getURL()));
			} else {
				pane = new ServerPanel(model);
				SERVERMAP.put(model.getURL(),pane);
			}
			pane.updateGui(model);
		} else {
			ServerPanel newpane = new ServerPanel(model);
			SERVERMAP.put(model.getURL(),newpane);
			this.SERVERS.add(newpane);
			newpane.updateGui(model);
		}
		this.SERVERS.updateUI();
	}

	/**
	 * clear will clear the hashmap, remove all ServerPanels
	 * from the servers pane, and update the ui.
	 */
	public void clear(){
		this.SERVERMAP.clear();
		this.SERVERS.removeAll();
		this.SERVERS.updateUI();
	}
}