/*
 * $Id$
 *
 * Copyright (c) 2001, 2009, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.sun.javatest.exec;

import java.awt.AWTEventMulticaster;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.accessibility.Accessible;
import javax.accessibility.AccessibleContext;
import javax.accessibility.AccessibleRole;
import javax.accessibility.AccessibleValue;

import javax.swing.JComponent;
import javax.swing.Timer;

import com.sun.javatest.util.I18NResourceBundle;

// this class needs to be rewritten; it's unclear what it's place in the world is

/**
 * ProgressMeter provides a horizontal bar that displays the relative proportions of
 * an array of numbers.
 */
class ProgressMeter extends JComponent implements Accessible {
    ProgressMeter(Color[] colors, MonitorState m) {
	this(colors);
	this.state = m;
	values = new int[colors.length];
    }

    ProgressMeter(Color[] colors, MonitorState m, String[] actions) {
	this(colors);
	this.actions = actions;
	this.state = m;
	values = new int[colors.length];
    }

    ProgressMeter(Color[] colors) {
	this.colors = colors;
	values = new int[colors.length];
	//setBorder(BorderFactory.createEmptyBorder(10,5,10,5));
    }

    public AccessibleContext getAccessibleContext() {
	if (ac == null)
	    ac = new PM_AccessibleContext(this);
	
	return ac;
    }

    public void setIndeterminate(boolean state) {
	indet = state;
    }

    public void start() {
	if (indet == false) {
	    myThread = new Thread() {
		public void run() {
		    while(myThread == currentThread()) {
			try {
			    synchronized (myThread) {
				update();

				// this is really an assertion, sync in
				// stop() should not allow this to happen
				// null indicates that we are not running and
				// should not be updating
				if (myThread == null)
				    break;

				myThread.wait(5000);
			    }
			}
			catch(InterruptedException e) {
			}
		    }	// while
		}
	    };	// Thread()

	    // user will notice this, so set a higher priority
	    myThread.setPriority(Thread.MIN_PRIORITY + 2);
	    myThread.start();
	}
	else {
	    clear();
	    indetTimer = new Timer(100, new ActionListener() {
		public void actionPerformed(ActionEvent evt) {
		    System.err.println("updating, width=" + getSize().width);
		}
	    });
	}
    }

    public void stop() {
	if (myThread == null)
	    return;

	if (indet == false) {
	    Thread old = myThread;

	    synchronized (myThread) {
		// sync because update Thread in start() is using this
		// variable
		myThread = null;
	    }

	    synchronized (old) {
		old.notify();
	    }
	}
	else {
	    indetTimer.stop();
	    clear();
	}
    }

    public void addActionListener(ActionListener l) {
	actionListener = AWTEventMulticaster.add(actionListener, l);
	if (actionListener != null && mouseListener == null) {
	    mouseListener = new MouseAdapter() {
		public void mouseClicked(MouseEvent me) {
		    int index = resolve(me.getX(), me.getY());
		    if (index == -1) 
			index = actions.length - 1;
		    if (index != -1) {
			ActionEvent ae = 
			    new ActionEvent(ProgressMeter.this, 
					    ActionEvent.ACTION_PERFORMED,
					    actions[index]);
			actionListener.actionPerformed(ae);
		    }
		}
	    };
	    addMouseListener(mouseListener);
	}
    }

    public void removeActionListener(ActionListener l) {
	actionListener = AWTEventMulticaster.remove(actionListener, l);
	if (actionListener == null)
	    removeMouseListener(mouseListener);
    }

    public void clear() {
	values = new int[colors.length];
	repaint();
    }

    public Dimension getMinimumSize() {
	return new Dimension(30, 8);
    }

    public Dimension getPreferredSize() {
	return new Dimension(50, 15);
    }


    public synchronized void set(int[] v) {
	int total = 0;
	for (int i = 0; i < v.length; i++)
	    total += v[i];
	set(v, total);
    }

    /**
     * Retrieve the stats from the MonitorState and repaint.
     */
    public synchronized void update() {
	int[] stats = state.getStats();
	set(stats, state.getTestsFoundCount());
	//repaint();
    }

    public synchronized void set(int[] v, int total) {
	// convert to normalized cumulative values and see if any have changed
	boolean changed = false;
	int totalSoFar = 0;
	for (int i = 0; i < v.length; i++) {
	    totalSoFar += v[i];
	    int x = (total == 0 ? 0 : totalSoFar * SCALE / total);
	    if (values[i] != x ) {
		values[i] = x;
		changed = true;
	    }
	}
		
	if (changed) {
	    repaint(100);
	    if (ac != null)
		ac.notifyNewStats();
	}
    }

    public synchronized void paint(Graphics g) {
	Dimension dims = getSize();
	g.drawRect(0, 0, dims.width - 1, dims.height - 1);
	g.setColor(Color.white);
	g.fillRect(1, 1, dims.width - 2, dims.height - 2);
	int start = 0;
	for (int i = 0; i < values.length; i++) {
	    int end = values[i] * (dims.width - 2) / SCALE;
	    g.setColor(colors[i]);
	    g.fillRect(1 + start, 1, end - start, dims.height - 2);
	    start = end;
	}
    }

    int resolve(int x, int y) {
	Dimension dims = getSize();
	if (x > 0) {
	    for (int i = 0; i < values.length; i++) {
		int end = values[i] * (dims.width - 2) / SCALE;
		if (x < end)
		    return i;
	    }
	}
	return -1;
    }

    private boolean indet;
    private Timer indetTimer;

    private Color[] colors;
    private String[] actions;
    private int[] values;
    private static final int SCALE = 1024;
    private ActionListener actionListener;
    private MouseListener mouseListener;
    private MonitorState state;
    private PM_AccessibleContext ac;
    private volatile Thread myThread;
    private static I18NResourceBundle i18n;

    private class PM_AccessibleContext
	    extends JComponent.AccessibleJComponent
	    implements AccessibleValue /*, AccessibleText*/ {
	PM_AccessibleContext(ProgressMeter pm) {
	    //super();
	    this.pm = pm;
	}

	public String getAccessibleDescription() {
	    String superdesc = super.getAccessibleDescription();
	    if (superdesc == null)
		return pm.getToolTipText();
	    else {
		if (i18n == null)
		    i18n = I18NResourceBundle.getBundleForClass(getClass());

		return i18n.getString("pmtr.desc");
	    }
	}

	public String getAccessibleName() {
	    String supername = super.getAccessibleName();
	    if (supername == null) {
		if (i18n == null)
		    i18n = I18NResourceBundle.getBundleForClass(getClass());
		else { }

		return i18n.getString("pmtr.name");
	    }
	    else {
		return supername;
	    }
	}

	public AccessibleRole getAccessibleRole() {
	    return AccessibleRole.PROGRESS_BAR;
	}

	public AccessibleValue getAccessibleValue() {
	    return this;
	}

	// accessible value
	public Number getCurrentAccessibleValue() {
	    int ttl = 0;
	    int[] stats = state.getStats();

	    // add up all but last component
	    // this gives the info of a traditional progress bar
	    for (int i = 0; i < stats.length - 1; i++)
		ttl += stats[i];

	    return new Integer(ttl);
	}

	public Number getMaximumAccessibleValue() {
	    return new Integer(state.getTestsFoundCount());
	}

	public Number getMinimumAccessibleValue() {
	    return new Integer(0);
	}

	public boolean setCurrentAccessibleValue(Number n) {
	    // not a valid action
	    return false;
	}

	// specialized methods

	/**
	 * External notification that the PM has changed.
	 */
	void notifyNewStats() {
	}

	private ProgressMeter pm;
    }
}
