/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.wicket.extensions.ajax.markup.html.tabs;

import java.util.List;
import java.util.Optional;

import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.markup.html.AjaxFallbackLink;
import org.apache.wicket.extensions.markup.html.tabs.ITab;
import org.apache.wicket.extensions.markup.html.tabs.TabbedPanel;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.model.IModel;


/**
 * Ajaxified version of the tabbed panel. Uses AjaxFallbackLink instead of regular wicket links so
 * it can update itself inplace.
 * 
 * @author Igor Vaynberg (ivaynberg)
 * 
 * @param <T>
 *            The type of panel to be used for this component's tabs. Just use {@link ITab} if you
 *            have no special needs here.
 */
public class AjaxTabbedPanel<T extends ITab> extends TabbedPanel<T>
{
	private static final long serialVersionUID = 1L;

	/**
	 * Constructor
	 * 
	 * @param id
	 * @param tabs
	 */
	public AjaxTabbedPanel(final String id, final List<T> tabs)
	{
		this(id, tabs, null);
	}

	/**
	 * Constructor
	 * 
	 * @param id
	 * @param tabs
	 * @param model
	 *            model holding the index of the selected tab
	 */
	public AjaxTabbedPanel(final String id, final List<T> tabs, IModel<Integer> model)
	{
		super(id, tabs, model);
		setOutputMarkupId(true);

		setVersioned(false);
	}

	@Override
	protected WebMarkupContainer newLink(final String linkId, final int index)
	{
		return new AjaxFallbackLink<Void>(linkId)
		{
			private static final long serialVersionUID = 1L;

			@Override
			public void onClick(Optional<AjaxRequestTarget> targetOptional)
			{
				setSelectedTab(index);
				targetOptional.ifPresent(target -> target.add(AjaxTabbedPanel.this));
				onAjaxUpdate(targetOptional);
			}
		};
	}

	/**
	 * A template method that lets users add additional behavior when ajax update occurs. This
	 * method is called after the current tab has been set so access to it can be obtained via
	 * {@link #getSelectedTab()}.
	 * <p>
	 * <strong>Note</strong> Since an {@link AjaxFallbackLink} is used to back the ajax update the
	 * <code>target</code> argument can be null when the client browser does not support ajax and
	 * the fallback mode is used. See {@link AjaxFallbackLink} for details.
	 *
	 * @param target
	 *            ajax target used to update this component
	 */
	protected void onAjaxUpdate(final Optional<AjaxRequestTarget> target)
	{
	}

}