/*
 * 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.upload;

import java.util.List;
import org.apache.wicket.Component;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.markup.html.AjaxLink;
import org.apache.wicket.ajax.markup.html.form.AjaxCheckBox;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.core.request.handler.IPartialPageRequestHandler;
import org.apache.wicket.event.IEvent;
import org.apache.wicket.examples.WicketExamplePage;
import org.apache.wicket.extensions.ajax.markup.html.form.upload.UploadProgressBar;
import org.apache.wicket.markup.head.IHeaderResponse;
import org.apache.wicket.markup.head.OnDomReadyHeaderItem;
import org.apache.wicket.markup.head.OnEventHeaderItem;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.markup.html.form.upload.resource.IUploadsFileManager;
import org.apache.wicket.markup.html.form.upload.resource.FileUploadToResourceField;
import org.apache.wicket.markup.html.panel.FeedbackPanel;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.Model;
import org.apache.wicket.request.mapper.parameter.PageParameters;
import org.apache.wicket.util.lang.Bytes;

/**
 * Upload example.
 *
 * @author reiern70
 */
public class UploadToResourcePage extends WicketExamplePage
{
    private static class UpdateInEachAjaxRequestBehavior extends Behavior
    {

        @Override
        public void bind(Component component)
        {
            component.setOutputMarkupPlaceholderTag(true);
        }

        @Override
        public void onEvent(Component component, IEvent<?> event)
        {
            if (event.getPayload() instanceof AjaxRequestTarget)
            {
                ((AjaxRequestTarget)event.getPayload()).add(component);
            }
        }
    }

    private final FeedbackPanel uploadFeedback;

    private final FileUploadToResourceField fileUploadToResourceField;

    private boolean uploading;

    private int counter;

    private final IModel<Boolean> allowToLeavePageWhileUploading = Model.of(true);

    /**
     * Constructor.
     *
     * @param parameters
     *            Page parameters
     */
    public UploadToResourcePage(final PageParameters parameters)
    {
        fileUploadToResourceField = new FileUploadToResourceField("fileInput")
        {

            private void updateFeedback(AjaxRequestTarget target)
            {
                target.add(uploadFeedback);
                uploading = false;
            }

            @Override
            protected void onUploadSuccess(AjaxRequestTarget target, List<UploadInfo> infos)
            {
                for (UploadInfo uploadInfo : infos) {
                    info("File " + uploadInfo.getClientFileName() + " successfully uploaded. Size: " + uploadInfo.getSize() + "bytes. ContentType: "
                            + uploadInfo.getContentType() +". Stored at " +  uploadInfo.getFile().getAbsolutePath());
                }
                updateFeedback(target);
            }

            @Override
            protected void onUploadFailure(AjaxRequestTarget target, String errorInfo)
            {
                updateFeedback(target);
            }

            @Override
            public void startUpload(IPartialPageRequestHandler target) {
                if (allowToLeavePageWhileUploading.getObject())
                {
                    target.prependJavaScript("Wicket.CurrentUpload = {};");
                }
                super.startUpload(target);
            }

            @Override
            protected void onUploadCanceled(AjaxRequestTarget target)
            {
                info("You have canceled the upload!");
                updateFeedback(target);
            }

            @Override
            protected CharSequence getClientSideSuccessCallBack() {
                return "function() {Wicket.CurrentUpload = null}";
            }

            @Override
            protected CharSequence getClientSideUploadErrorCallBack()
            {
                return "function() {Wicket.CurrentUpload = null}";
            }

            @Override
            protected String getClientSideCancelCallBack()
            {
                return "function() {Wicket.CurrentUpload = null}";
            }

            @Override
            protected IUploadsFileManager fileManager()
            {
                return getUploadsFileManager();
            }
        };
        fileUploadToResourceField.setMaxSize(Bytes.kilobytes(100));
        fileUploadToResourceField.setFileMaxSize(Bytes.kilobytes(90));
        fileUploadToResourceField.setFileCountMax(5L);
        add(fileUploadToResourceField);

        Form<Void> form = new Form<>("form");
        add(form);
        form.add(new AjaxCheckBox("allowToLeavePageWhileUploading", allowToLeavePageWhileUploading) {
            @Override
            protected void onUpdate(AjaxRequestTarget target) {

            }
        });
        final UploadProgressBar uploadProgressBar = new UploadProgressBar("progress", fileUploadToResourceField)
        {

            @Override
            protected String getOnProgressUpdatedCallBack()
            {
                return "function(percent) { console.log(percent);}";
            }
        };
        add(uploadProgressBar);
        add(new AjaxLink<Void>("upload")
        {
            @Override
            public void onClick(AjaxRequestTarget target)
            {
                uploading = true;
                fileUploadToResourceField.startUpload(target);
                uploadProgressBar.start(target);
                target.add(uploadFeedback);
            }

            @Override
            protected void onConfigure()
            {
                super.onConfigure();
                setVisible(!uploading);
            }
        }.add(new UpdateInEachAjaxRequestBehavior()));

        add(new AjaxLink<Void>("cancelUpload")
        {
            @Override
            public void onClick(AjaxRequestTarget target)
            {
                fileUploadToResourceField.cancelUpload(target);
                target.add(uploadFeedback);
            }

            @Override
            protected void onConfigure()
            {
                super.onConfigure();
                setVisible(uploading);
            }
        }.add(new UpdateInEachAjaxRequestBehavior()));


        add(new WebMarkupContainer("cancelUploadClientSide")
        {

            @Override
            public void renderHead(IHeaderResponse response) {
                super.renderHead(response);
                response.render(OnEventHeaderItem.forComponent(this, "click", fileUploadToResourceField.getTriggerCancelUploadScript()));
            }

            @Override
            protected void onConfigure()
            {
                super.onConfigure();
                setVisible(uploading);
            }

        }.add(new UpdateInEachAjaxRequestBehavior()));

        add(new AjaxLink<Void>("counter")
        {

            @Override
            public void onClick(AjaxRequestTarget target)
            {
                counter ++;
                target.add(this);
            }

        }.setBody(()-> "Click me: upload does not blocks normal wicket AJAX. I was clicked " + counter).setOutputMarkupId(true));
        // Create feedback panels
        uploadFeedback = new FeedbackPanel("uploadFeedback");
        uploadFeedback.setOutputMarkupId(true);

        // Add uploadFeedback to the page itself
        add(uploadFeedback);

    }

    @Override
    public void renderHead(IHeaderResponse response) {
        super.renderHead(response);
        response.render(
                OnDomReadyHeaderItem.forScript("$(window).bind('beforeunload', function(){ if (Wicket.CurrentUpload != null) { return 'leave?'; }});"));
    }

    @Override
    protected void onBeforeRender()
    {
        super.onBeforeRender();
        uploading = false;
    }

    private IUploadsFileManager getUploadsFileManager()
    {
        return UploadApplication.getInstance().getUploadsFileManager();
    }
}