/*
 * 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.versioning;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;

import org.apache.wicket.IPageManagerProvider;
import org.apache.wicket.Page;
import org.apache.wicket.page.IPageManager;
import org.apache.wicket.page.IPageManagerContext;
import org.apache.wicket.page.PageStoreManager;
import org.apache.wicket.pageStore.AsynchronousDataStore;
import org.apache.wicket.pageStore.DefaultPageStore;
import org.apache.wicket.pageStore.IDataStore;
import org.apache.wicket.protocol.http.WebApplication;
import org.apache.wicket.serialize.java.JavaSerializer;
import org.apache.wicket.util.tester.WicketTester;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

/**
 * A test for page versioning
 */
public class PageVersioningTest
{
	WicketTester wicketTester;

	/**
	 * setup()
	 */
	@Before
	public void setup()
	{
		final PageVersioningApplication application = new PageVersioningApplication();

		wicketTester = new WicketTester(application)
		{

			/**
			 * @see org.apache.wicket.util.tester.BaseWicketTester#newTestPageManagerProvider()
			 */
			@Override
			protected IPageManagerProvider newTestPageManagerProvider()
			{
				return new IPageManagerProvider()
				{

					@Override
					public IPageManager apply(IPageManagerContext pageManagerContext)
					{

						final IDataStore dataStore = new InMemoryPageStore();
						final AsynchronousDataStore asyncDS = new AsynchronousDataStore(dataStore,
							100);
						final DefaultPageStore pageStore = new DefaultPageStore(new JavaSerializer(
							application.getApplicationKey()), asyncDS, 40);
						return new PageStoreManager(application.getName(), pageStore,
							pageManagerContext);
					}
				};
			}

		};
	}

	/**
	 */
	@After
	public void after()
	{
		wicketTester.destroy();
	}

	/**
	 * versionPage()
	 */
	@Test
	public void versionPage()
	{
		Page versioningPage = wicketTester.startPage(VersioningTestPage.class);

		assertEquals(0, versioningPage.getPageId());

		wicketTester.clickLink("noopLink");
		assertEquals(0, versioningPage.getPageId());

		wicketTester.clickLink("ajaxUpdatingLink", true);
		assertEquals(0, versioningPage.getPageId());

		wicketTester.clickLink("ajaxUpdatingChangeModelLink", true);
		assertEquals(0, versioningPage.getPageId());

		wicketTester.clickLink("addTemporaryBehaviorLink");
		assertEquals(0, versioningPage.getPageId());

		wicketTester.clickLink("addBehaviorLink");
		assertEquals(1, versioningPage.getPageId());

		wicketTester.clickLink("changeEnabledStateLink");
		assertEquals(2, versioningPage.getPageId());

		wicketTester.clickLink("changeVisibilityStateLink");
		assertEquals(3, versioningPage.getPageId());

		try
		{
			// disable page versioning and execute something that otherwise would create a new
			// version
			versioningPage.setVersioned(false);
			wicketTester.clickLink("changeVisibilityStateLink");
			assertEquals(3, versioningPage.getPageId());
		}
		finally
		{
			versioningPage.setVersioned(true);
		}

		checkPageVersionsAreStored(versioningPage);
	}

	/**
	 * Asserts that there is a version of the page for each operation that modified the page
	 * 
	 * @param versioningPage
	 */
	private void checkPageVersionsAreStored(Page versioningPage)
	{
		IPageManager pageManager = wicketTester.getSession().getPageManager();

		int lastPageId = versioningPage.getPageId();
		while (lastPageId >= 0)
		{
			assertNotNull(pageManager.getPage(lastPageId));
			lastPageId--;
		}
	}

	private static final class PageVersioningApplication extends WebApplication
	{

		@Override
		public Class<? extends Page> getHomePage()
		{
			return VersioningTestPage.class;
		}
	};
}