/*
 * $Id$
 *
 * Copyright (c) 1996, 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
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 * questions.
 */
package com.sun.interview.wizard;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Toolkit;
import javax.help.BadIDException;
import javax.help.HelpSet;
import javax.help.InvalidHelpSetContextException;
import javax.help.JHelpContentViewer;
import javax.help.Map.ID;
import javax.accessibility.AccessibleContext;
import javax.swing.JComponent;
import javax.swing.event.AncestorEvent;
import javax.swing.event.AncestorListener;

import com.sun.interview.ErrorQuestion;
import com.sun.interview.Interview;
import com.sun.interview.Question;

class InfoPanel extends JComponent
{
    public InfoPanel(Interview interview) {
	this.interview = interview;
	infoHelpSet = interview.getHelpSet();
	viewer = new JHelpContentViewer(infoHelpSet);
	viewer.setName("help");
	viewer.setToolTipText(i18n.getString("info.tip"));
	AccessibleContext v_ac = viewer.getAccessibleContext();
	v_ac.setAccessibleName(i18n.getString("info.name"));
	v_ac.setAccessibleDescription(viewer.getToolTipText());
	setName("info");
	setLayout(new BorderLayout());
	addAncestorListener(new Listener());
	add(viewer, BorderLayout.CENTER);
    }

    public HelpSet getHelpSet() {
	return infoHelpSet;
    }

    public void setCurrentID(Question q) {
	try {
	    ID id = q.getHelpID();
	    // uugh
	    if (id == null) 
		System.err.println("WARNING: no help for " + q.getKey());
	    else {
		//System.err.println("IP: set help ID " + id);
		viewer.setCurrentID(id);
		//System.err.println("IP: currentURL " + viewer.getCurrentURL());
		//System.err.println("IP: currentTitle " + viewer.getDocumentTitle());
	    }
	}
	catch (BadIDException e) {
	    System.err.println("WARNING: no help for " + q.getKey());
	}
	catch (InvalidHelpSetContextException e) {
	    e.printStackTrace();
	}
    }

    public Dimension getPreferredSize() {
	Toolkit tk = Toolkit.getDefaultToolkit();
	Dimension d = new Dimension(PREFERRED_WIDTH*tk.getScreenResolution(),
				    PREFERRED_HEIGHT*tk.getScreenResolution());
	return d;
    }

    private Interview interview;
    private HelpSet infoHelpSet;
    private JHelpContentViewer viewer;
    private Listener listener = new Listener();

    private static final I18NResourceBundle i18n = I18NResourceBundle.getDefaultBundle();

    private static final int PREFERRED_WIDTH = 4; // inches
    private static final int PREFERRED_HEIGHT = 3; // inches

    private class Listener implements AncestorListener, Interview.Observer
    {
	// ---------- from AncestorListener -----------

	public void ancestorAdded(AncestorEvent e) {
	    interview.addObserver(this);
	    currentQuestionChanged(interview.getCurrentQuestion());
	}

	public void ancestorMoved(AncestorEvent e) { }

	public void ancestorRemoved(AncestorEvent e) {
	    interview.removeObserver(this);
	}

	//----- from Interview.Observer -----------

	public void pathUpdated() { }

	public void currentQuestionChanged(Question q) { 
	    if (!(q instanceof ErrorQuestion))
		setCurrentID(q);
	}
    }
}
