/*
 * 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"));
    }
}