/*
 * 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.websocket;

import java.time.Duration;
import java.util.concurrent.ScheduledExecutorService;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.core.request.handler.IPartialPageRequestHandler;
import org.apache.wicket.examples.WicketExamplePage;
import org.apache.wicket.examples.websocket.charts.ChartUpdater;
import org.apache.wicket.examples.websocket.charts.WebSocketChart;
import org.apache.wicket.extensions.ajax.AjaxDownloadBehavior;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.protocol.ws.api.WebSocketBehavior;
import org.apache.wicket.protocol.ws.api.WebSocketRequestHandler;
import org.apache.wicket.protocol.ws.api.message.ConnectedMessage;
import org.apache.wicket.protocol.ws.api.message.TextMessage;
import org.apache.wicket.request.resource.ContentDisposition;
import org.apache.wicket.request.resource.IResource;
import org.apache.wicket.request.resource.ResourceStreamResource;
import org.apache.wicket.util.resource.IResourceStream;
import org.apache.wicket.util.resource.StringResourceStream;

public class WebSocketBehaviorDemoPage extends WicketExamplePage
{
    private static final long serialVersionUID = 1L;
    private final WebMarkupContainer downloadingContainer = new WebMarkupContainer("downloading");

    @Override
    protected void onInitialize() {
        super.onInitialize();

        ResourceStreamResource resource = new ResourceStreamResource()
        {
            private static final long serialVersionUID = 1L;
            private int i = 42;

            @Override
            protected IResourceStream getResourceStream(IResource.Attributes attributes)
            {
                return new StringResourceStream("downloaded via ajax " + (i++) + " times");
            }
        }.setContentDisposition(ContentDisposition.ATTACHMENT)
            .setFileName("File-from-IResource.txt")
            .setCacheDuration(Duration.ZERO);

        final AjaxDownloadBehavior download = new AjaxDownloadBehavior(resource)
        {
            private static final long serialVersionUID = 1L;

            @Override
            protected void onBeforeDownload(IPartialPageRequestHandler handler)
            {
                downloadingContainer.setVisible(true);
                handler.add(downloadingContainer);
            }

            @Override
            protected void onDownloadSuccess(AjaxRequestTarget target)
            {
                downloadingContainer.setVisible(false);
                target.add(downloadingContainer);
            }

            @Override
            protected void onDownloadFailed(AjaxRequestTarget target)
            {
                downloadingContainer.setVisible(false);
                target.add(downloadingContainer);

                target.appendJavaScript("alert('Download failed');");
            }
        };
        add(download);
        WebSocketChart chartPanel = new WebSocketChart("chartPanel");
        chartPanel.add(new WebSocketBehavior()
        {
            private static final long serialVersionUID = 1L;

            @Override
            protected void onConnect(ConnectedMessage message)
            {
                super.onConnect(message);

                ScheduledExecutorService service = JSR356Application.get().getScheduledExecutorService();
                ChartUpdater.start(message, service);
            }
        });
        add(downloadingContainer.setOutputMarkupPlaceholderTag(true).setVisible(false));
        add(chartPanel);

        add(new WebSocketBehavior()
        {
            private static final long serialVersionUID = 1L;

            @Override
            protected void onMessage(WebSocketRequestHandler handler, TextMessage message)
            {
                if ("start".equals(message.getText()))
                {
                    download.initiate(handler);
                }
            }
        });
    }
}