/**
    * This file Copyright (c) 2015 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.dam.external.app.field;
  
  import info.magnolia.cms.beans.config.MIMEMapping;
  import info.magnolia.dam.api.Asset;
  import info.magnolia.dam.app.ui.field.configuration.PreviewComponentProvider;
  import info.magnolia.dam.external.app.field.definition.AssetMediaFieldDefinition;
  import info.magnolia.objectfactory.ComponentProvider;
  import info.magnolia.ui.vaadin.integration.ItemAdapter;
  
  import java.io.InputStream;
  
  import org.apache.commons.lang3.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.vaadin.data.Item;
  import com.vaadin.data.util.BeanItem;
  import com.vaadin.server.Resource;
  import com.vaadin.server.StreamResource;
  import com.vaadin.shared.ui.label.ContentMode;
  import com.vaadin.ui.Button;
  import com.vaadin.ui.Button.ClickEvent;
  import com.vaadin.ui.Component;
  import com.vaadin.ui.CssLayout;
  import com.vaadin.ui.CustomField;
  import com.vaadin.ui.Image;
  import com.vaadin.ui.Label;
  
  /**
   * A base custom field comprising of an image and expand button.
   */
  public class AssetMediaField extends CustomField<BeanItem> {
  
      public static final String ICON_TAG = "<span class=\"file-preview preview-image %s v-label-icon-element\"></span>";
      private static final String SEARCH_ICON = "<span class=\"icon-search\"></span>";
      private static final Logger log = LoggerFactory.getLogger(AssetMediaField.class);
      private CssLayout root;
      protected Image embedded = new Image();
  
      protected final ComponentProvider componentProvider;
      protected final AssetMediaFieldDefinition definition;
      protected final Item relatedFieldItem;
  
      public AssetMediaField(AssetMediaFieldDefinition definition, Item relatedFieldItem, ComponentProvider componentProvider) {
          this.componentProvider = componentProvider;
          this.definition = definition;
          this.relatedFieldItem = relatedFieldItem;
      }
  
      @Override
      protected Component initContent() {
          root = new CssLayout();
          root.setWidth("150px");
          root.setHeight("150px");
          setImmediate(false);
          initFields();
          return root;
      }
  
      protected void initFields() {
          BeanItem<Asset> value = (BeanItem<Asset>) getPropertyDataSource().getValue();
          initFields(value);
          // Update DataSource in order to handle the fields default values
          if (relatedFieldItem instanceof ItemAdapter && ((ItemAdapter) relatedFieldItem).isNew()) {
              getPropertyDataSource().setValue(getValue());
          }
     }
 
     protected void initFields(BeanItem<Asset> beanItem) {
         if (beanItem == null || beanItem.getBean() == null) {
             return;
         }
         // Get Asset
         final Asset asset = beanItem.getBean();
         if (asset.getMimeType().startsWith("image/")) {
             final Resource imageResource = getResource(asset);
 
             Button lightboxButton = new Button();
             lightboxButton.addStyleName("lightbox-button");
             lightboxButton.setHtmlContentAllowed(true);
             lightboxButton.setCaption(SEARCH_ICON);
             root.addComponent(lightboxButton);
 
             embedded = new Image("", imageResource);
             embedded.addStyleName("preview-image");
             root.addComponent(embedded);
 
             lightboxButton.addClickListener(new Button.ClickListener() {
                 @Override
                 public void buttonClick(ClickEvent event) {
                     Class<? extends PreviewComponentProvider> previewActionClass = definition.getPreviewComponentProviderClass();
                     // Launch Lightbox component
                     if (previewActionClass != null) {
                         PreviewComponentProvider implementation = componentProvider.newInstance(previewActionClass);
                         implementation.open(imageResource);
                     } else {
                         log.warn("No preview component defined.");
                     }
                 }
             });
         } else {
             Label icon = getIcon(asset);
             icon.addStyleName("preview-image");
             root.addComponent(icon);
         }
     }
 
     private Label getIcon(Asset asset) {
         String mimeType = asset.getMimeType();
         if (StringUtils.isBlank(mimeType)) {
             return new Label(String.format(ICON_TAG, MIMEMapping.DEFAULT_ICON_STYLE), ContentMode.HTML);
         }
         String icon = MIMEMapping.getMIMETypeIconStyle(mimeType);
         return new Label(String.format(ICON_TAG, icon), ContentMode.HTML);
     }
 
     /**
      * Create a resource from the content stream.
      */
     protected Resource getResource(final Asset asset) {
         final String mimeType = asset.getMimeType();
         StreamResource.StreamSource streamSource = new StreamResource.StreamSource() {
             @Override
             public InputStream getStream() {
                 return asset.getAssetProvider().getAsset(asset.getItemKey()).getContentStream();
             }
         };
 
         final Resource resource = new StreamResource(streamSource, asset.getFileName()) {
             @Override
             public String getMIMEType() {
                 return mimeType;
             }
         };
         return resource;
     }
 
     @Override
     public Class<? extends BeanItem> getType() {
         return (Class<? extends BeanItem>) BeanItem.class;
     }
 }