/*
 * Copyright (c) 2010, Michael Grossmann
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * * Neither the name of the jo-widgets.org nor the
 * names of its contributors may be used to endorse or promote products
 * derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */
package org.jowidgets.spi.impl.swt.common.widgets;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.jowidgets.common.widgets.controller.IItemStateListener;
import org.jowidgets.spi.impl.controller.ItemStateObservable;
import org.jowidgets.spi.impl.swt.common.image.SwtImageRegistry;
import org.jowidgets.spi.widgets.ISelectableMenuItemSpi;

public class SelectableMenuItemImpl extends MenuItemImpl implements ISelectableMenuItemSpi {

    private final ItemStateObservable itemStateObservable;

    public SelectableMenuItemImpl(final MenuItem menuItem, final SwtImageRegistry imageRegistry) {
        super(menuItem, imageRegistry);

        this.itemStateObservable = new ItemStateObservable();
        menuItem.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(final SelectionEvent e) {
                itemStateObservable.fireItemStateChanged(isSelected());
            }
        });
    }

    @Override
    public boolean isSelected() {
        return getUiReference().getSelection();
    }

    private static boolean isRadio(final MenuItem menuItem) {
        return (menuItem.getStyle() & SWT.RADIO) == SWT.RADIO;
    }

    private static void unselectItem(final MenuItem menuItem) {
        if (menuItem.getSelection()) {
            menuItem.setSelection(false);
            menuItem.notifyListeners(SWT.Selection, new Event());
        }
    }

    @Override
    public void setSelected(final boolean selected) {
        if (selected && isRadio(getUiReference())) {
            final Menu menu = getUiReference().getParent();
            final MenuItem[] items = menu.getItems();
            final int index = menu.indexOf(getUiReference());

            int i = index - 1;
            while (i >= 0 && isRadio(items[i])) {
                unselectItem(items[i]);
                i--;
            }

            i = index + 1;
            while (i < menu.getItemCount() && isRadio(items[i])) {
                unselectItem(items[i]);
                i++;
            }
        }
        getUiReference().setSelection(selected);
        itemStateObservable.fireItemStateChanged(isSelected());
    }

    @Override
    public void addItemListener(final IItemStateListener listener) {
        itemStateObservable.addItemListener(listener);
    }

    @Override
    public void removeItemListener(final IItemStateListener listener) {
        itemStateObservable.removeItemListener(listener);
    }

}