/*
 * 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.examples.ajax.builtin;

import java.util.List;
import java.util.Optional;
import java.util.concurrent.TimeUnit;

import org.apache.wicket.Component;
import org.apache.wicket.WicketRuntimeException;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.attributes.AjaxCallListener;
import org.apache.wicket.ajax.attributes.AjaxRequestAttributes;
import org.apache.wicket.ajax.attributes.IAjaxCallListener;
import org.apache.wicket.ajax.markup.html.AjaxFallbackLink;
import org.apache.wicket.ajax.markup.html.AjaxLink;
import org.apache.wicket.extensions.ajax.markup.html.IndicatingAjaxLink;
import org.apache.wicket.markup.head.CssHeaderItem;
import org.apache.wicket.markup.head.IHeaderResponse;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.model.PropertyModel;
import org.apache.wicket.settings.ExceptionSettings;


/**
 * Ajax links demo.
 * 
 * @author ivaynberg
 */
public class LinksPage extends BasePage
{
	private int counter1 = 0;
	private int counter2 = 0;
	private int counter3 = 0;

	/**
	 * @return Value of counter1
	 */
	public int getCounter1()
	{
		return counter1;
	}

	/**
	 * @return Value for counter2
	 */
	public int getCounter2()
	{
		return counter2;
	}

	/**
	 * @return Value of counter3
	 */
	public int getCounter3()
	{
		return counter3;
	}

	/**
	 * Constructor
	 */
	public LinksPage()
	{
		final Label c1 = new Label("c1", new PropertyModel<>(this, "counter1"));
		c1.setOutputMarkupId(true);
		add(c1);

		final Label c2 = new Label("c2", new PropertyModel<>(this, "counter2"));
		c2.setOutputMarkupId(true);
		add(c2);

		final Label c3 = new Label("c3", new PropertyModel<>(this, "counter3"));
		c3.setOutputMarkupId(true);
		add(c3);

		add(new AjaxLink<Void>("c1-link")
		{
			@Override
			public void onClick(AjaxRequestTarget target)
			{
				counter1++;
				target.add(c1);
			}
		});

		add(new AjaxFallbackLink<Void>("c2-link")
		{
			@Override
			public void onClick(Optional<AjaxRequestTarget> targetOptional)
			{
				counter2++;
				// notice that for a fallback link we need to make sure the
				// target is not null. if the target is null ajax failed and the
				// fallback was used, so there is no need to do any ajax-related
				// processing.
				targetOptional.ifPresent(target -> target.add(c2));
			}
		});

		add(IndicatingAjaxLink.onClick("c3-link", (link, target) -> {
			counter3++;
			target.add(c3);
			try
			{
				// sleep for 5 seconds to show off the busy indicator
				TimeUnit.SECONDS.sleep(5);
			}
			catch (InterruptedException e)
			{
				// noop
			}
		}));

		add(new AjaxLink<Void>("success-link")
		{
			@Override
			public void onClick(AjaxRequestTarget target)
			{
			}

			@Override
			protected void updateAjaxAttributes(AjaxRequestAttributes attributes)
			{
				super.updateAjaxAttributes(attributes);

				IAjaxCallListener ajaxCallListener = new AjaxCallListener() {
					@Override
					public CharSequence getSuccessHandler(Component component)
					{
						return "alert('Success');";
					}

					@Override
					public CharSequence getBeforeSendHandler(Component component)
					{
						return "alert('Before ajax call');";
					}

					@Override
					public CharSequence getFailureHandler(Component component)
					{
						return "alert('Failure');";
					}
				};
				attributes.getAjaxCallListeners().add(ajaxCallListener);

				List<CharSequence> urlArgumentMethods = attributes.getDynamicExtraParameters();
				urlArgumentMethods.add("return {'htmlname': document.documentElement.tagName};");
				urlArgumentMethods.add("return {'bodyname': document.body.tagName};");
			}
		});

		add(new AjaxLink<Void>("failure-link")
		{
			@Override
			public void onClick(AjaxRequestTarget target)
			{
				// Set the proper setting to execute ajax failure handler
				// note: will be set until the "exception" link is clicked or the application is
				// restarted
				getApplication().getExceptionSettings().setAjaxErrorHandlingStrategy(
					ExceptionSettings.AjaxErrorStrategy.INVOKE_FAILURE_HANDLER);

				throw new WicketRuntimeException("Failure link clicked");
			}

			@Override
			protected void updateAjaxAttributes(AjaxRequestAttributes attributes)
			{
				super.updateAjaxAttributes(attributes);
				
				IAjaxCallListener ajaxCallListener = new AjaxCallListener() {
					@Override
					public CharSequence getBeforeHandler(Component component)
					{
						return "alert('Before ajax call');";
					}

					@Override
					public CharSequence getSuccessHandler(Component component)
					{
						return "alert('Success');";
					}

					@Override
					public CharSequence getFailureHandler(Component component)
					{
						return "alert('Failure');";
					}
				};
				attributes.getAjaxCallListeners().add(ajaxCallListener);
			}
		});

		add(new AjaxLink<Void>("set-response-page") {
			@Override
			public void onClick(AjaxRequestTarget target) {
				setResponsePage(LinksPage.class);
			}
		});

		add(new AjaxLink<Void>("exception") {
			@Override
			public void onClick(AjaxRequestTarget target) {
				// Set the proper setting to show the error page
				// note: will be set until the "failure" link is clicked or the application is
				// restarted
				getApplication().getExceptionSettings().setAjaxErrorHandlingStrategy(
					ExceptionSettings.AjaxErrorStrategy.REDIRECT_TO_ERROR_PAGE);

				throw new RuntimeException("test whether the exception handling works");
			}
		});
	}
	
	@Override
	public void renderHead(IHeaderResponse response)
	{
		super.renderHead(response);
		response.render(CssHeaderItem.forCSS(
			"span.wicket-ajax-indicator { margin:0; padding:0; padding-left: 2px; }", "indicator"));
	}
}
