/*******************************************************************************
 * Copyright (c) 2008, 2009 Ketan Padegaonkar and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Ketan Padegaonkar - initial API and implementation
 *     Ketan Padegaonkar - http://swtbot.org/bugzilla/show_bug.cgi?id=88
 *******************************************************************************/
package org.eclipse.swtbot.swt.finder.widgets;

import static org.eclipse.swtbot.swt.finder.matchers.WidgetMatcherFactory.withMnemonic;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.widgets.ToolItem;
import org.eclipse.swtbot.swt.finder.ReferenceBy;
import org.eclipse.swtbot.swt.finder.SWTBot;
import org.eclipse.swtbot.swt.finder.SWTBotWidget;
import org.eclipse.swtbot.swt.finder.Style;
import org.eclipse.swtbot.swt.finder.exceptions.WidgetNotFoundException;
import org.eclipse.swtbot.swt.finder.finders.EventContextMenuFinder;
import org.eclipse.swtbot.swt.finder.utils.MessageFormat;
import org.eclipse.swtbot.swt.finder.utils.SWTUtils;
import org.eclipse.swtbot.swt.finder.utils.internal.Assert;
import org.hamcrest.Matcher;
import org.hamcrest.SelfDescribing;

/**
 * This represents a toolbar item that is a drop down button.
 *
 * @author Ketan Padegaonkar &lt;KetanPadegaonkar [at] gmail [dot] com&gt;
 * @version $Id$
 * @since 1.2
 */
@SWTBotWidget(clasz = ToolItem.class, preferredName = "toolbarDropDownButton", style = @Style(name = "SWT.DROP_DOWN", value = SWT.DROP_DOWN), referenceBy = {
		ReferenceBy.MNEMONIC, ReferenceBy.TOOLTIP}, returnType = SWTBotToolbarDropDownButton.class )
public class SWTBotToolbarDropDownButton extends SWTBotToolbarButton {

	/**
	 * Constructs an new instance of this item.
	 *
	 * @param w the tool item.
	 * @throws WidgetNotFoundException if the widget is <code>null</code> or widget has been disposed.
	 */
	public SWTBotToolbarDropDownButton(ToolItem w) throws WidgetNotFoundException {
		this(w, null);
	}

	/**
	 * Constructs an new instance of this item.
	 * 
	 * @param w the tool item.
	 * @param description the description of the widget, this will be reported by {@link #toString()}
	 * @throws WidgetNotFoundException if the widget is <code>null</code> or widget has been disposed.
	 */
	public SWTBotToolbarDropDownButton(ToolItem w, SelfDescribing description) throws WidgetNotFoundException {
		super(w, description);
		Assert.isTrue(SWTUtils.hasStyle(w, SWT.DROP_DOWN), "Expecting a drop down button."); //$NON-NLS-1$

	}

	/**
	 * Finds the submenu inside this menu item.
	 * <p>
	 * <b>NOTE:</b>Invoking this keeps the menu open until you click on it.
	 * </p>
	 * 
	 * @param menuItem the submenu to search
	 * @return the menu item with the specified text
	 * @since 1.0
	 */
	public SWTBotMenu menuItem(String menuItem) {
		Matcher<MenuItem> withMnemonic = withMnemonic(menuItem);
		return menuItem(withMnemonic);
	}

	/**
	 * Finds all the submenu inside this menu item that match the given matcher.
	 * <p>
	 * <b>NOTE:</b>Invoking this keeps the menu open until you click on it.
	 * </p>
	 * 
	 * @param matcher the matcher
	 * @return the menu item with the specified text
	 */
	public SWTBotMenu menuItem(Matcher<MenuItem> matcher) {
		return menuItems(matcher).get(0);
	}

	/**
	 * Finds all the submenus inside this menu item that match the given matcher.
	 * <p>
	 * <b>NOTE:</b>Invoking this keeps the menu open until you click on it.
	 * </p>
	 * 
	 * @param matcher the matcher
	 * @return the menu items matching the matcher.
	 * @throws WidgetNotFoundException if the menuItem could not be found
	 */
	public List<? extends SWTBotMenu> menuItems(Matcher<MenuItem> matcher) {
		EventContextMenuFinder menuFinder = new EventContextMenuFinder();
		try {
			menuFinder.register();
			log.debug(MessageFormat.format("Clicking on {0}", this)); //$NON-NLS-1$
			waitForEnabled();
			notify(SWT.MouseEnter);
			notify(SWT.MouseMove);
			notify(SWT.Activate);
			notify(SWT.FocusIn);
			notify(SWT.MouseDown);
			notify(SWT.MouseUp);
			notify(SWT.Selection, arrowEvent());
			notify(SWT.MouseHover);
			notify(SWT.MouseMove);
			notify(SWT.MouseExit);
			notify(SWT.Deactivate);
			notify(SWT.FocusOut);
			log.debug(MessageFormat.format("Clicked on {0}", this)); //$NON-NLS-1$
			List<MenuItem> findMenus = menuFinder.findMenus(new SWTBot().activeShell().widget, matcher, true);
			return toSWTBotMenuItems(matcher, findMenus);
		} finally {
			menuFinder.unregister();
		}
	}

	/**
	 * Click on the tool item.
	 *
	 * @since 1.0
	 */
	public SWTBotToolbarDropDownButton click() {
		log.debug(MessageFormat.format("Clicking on {0}", this)); //$NON-NLS-1$
		waitForEnabled();
		sendNotifications();
		log.debug(MessageFormat.format("Clicked on {0}", this)); //$NON-NLS-1$
		return this;
	}

	private ArrayList<SWTBotMenu> toSWTBotMenuItems(Matcher<?> matcher, List<MenuItem> findMenus) {
		ArrayList<SWTBotMenu> result = new ArrayList<SWTBotMenu>(findMenus.size());
		for (MenuItem menuItem : findMenus) {
			result.add(new SWTBotMenu(menuItem, matcher));
		}

		if (result.isEmpty())
			throw new WidgetNotFoundException("Could not find a menu item"); //$NON-NLS-1$
		return result;
	}

	/**
	 * Gets the arrow event.
	 * 
	 * @return The event.
	 */
	private Event arrowEvent() {
		Event event = createEvent();
		event.detail = SWT.ARROW;
		return event;
	}
}