/*

 * Copyright (c) 2011, 2016, 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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 */

package sun.lwawt.macosx;

import java.awt.Component;

import java.beans.PropertyChangeEvent;

import java.beans.PropertyChangeListener;

import java.lang.reflect.Field;

import javax.accessibility.Accessible;

import javax.accessibility.AccessibleContext;

import javax.swing.JProgressBar;

import javax.swing.JSlider;

import javax.swing.event.ChangeEvent;

import javax.swing.event.ChangeListener;

class CAccessible extends CFRetainedResource implements Accessible {

    static Field getNativeAXResourceField() {

        try {

            final Field field = AccessibleContext.class.getDeclaredField("nativeAXResource");

            field.setAccessible(true);

            return field;

        } catch (final Exception e) {

            e.printStackTrace();

            return null;

        }

    }

    private static Field nativeAXResourceField = getNativeAXResourceField();

    public static CAccessible getCAccessible(final Accessible a) {

        if (a == null) return null;

        AccessibleContext context = a.getAccessibleContext();

        try {

            final CAccessible cachedCAX = (CAccessible) nativeAXResourceField.get(context);

            if (cachedCAX != null) return cachedCAX;

            final CAccessible newCAX = new CAccessible(a);

            nativeAXResourceField.set(context, newCAX);

            return newCAX;

        }  catch (final Exception e) {

            e.printStackTrace();

            return null;

        }

    }

    private static native void unregisterFromCocoaAXSystem(long ptr);

    private static native void valueChanged(long ptr);

    private static native void selectionChanged(long ptr);

    private Accessible accessible;

    private CAccessible(final Accessible accessible) {

        super(0L, true); // real pointer will be poked in by native

        if (accessible == null) throw new NullPointerException();

        this.accessible = accessible;

        if (accessible instanceof Component) {

            addNotificationListeners((Component)accessible);

        }

    }

    @Override

    protected synchronized void dispose() {

        if (ptr != 0) unregisterFromCocoaAXSystem(ptr);

        super.dispose();

    }

    @Override

    public AccessibleContext getAccessibleContext() {

        return accessible.getAccessibleContext();

    }

    public void addNotificationListeners(Component c) {

        if (c instanceof Accessible) {

        }

        if (c instanceof JProgressBar) {

            JProgressBar pb = (JProgressBar) c;

            pb.addChangeListener(new AXProgressChangeNotifier());

        } else if (c instanceof JSlider) {

            JSlider slider = (JSlider) c;

            slider.addChangeListener(new AXProgressChangeNotifier());

        }

    }

        @Override

        public void propertyChange(PropertyChangeEvent e) {

            String name = e.getPropertyName();

            if ( ptr != 0 ) {

                    selectionChanged(ptr);

                }

            }

        }

    }

    private class AXProgressChangeNotifier implements ChangeListener {

        @Override

        public void stateChanged(ChangeEvent e) {

            if (ptr != 0) valueChanged(ptr);

        }

    }

    static Accessible getSwingAccessible(final Accessible a) {

        return (a instanceof CAccessible) ? ((CAccessible)a).accessible : a;

    }

}