/**
    * This file Copyright (c) 2018 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.ui.vaadin.ckeditor;
  
  
  import static info.magnolia.ui.vaadin.gwt.client.ckeditor.VMagnoliaCKEditorTextEvents.*;
  
  import java.net.URI;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import java.util.Map;
  import java.util.Objects;
  import java.util.Optional;
  
  import org.apache.commons.lang3.StringUtils;
  import org.vaadin.alump.ckeditor.CKEditorTextField;
  
  import com.vaadin.server.Page;
  import com.vaadin.server.PaintException;
  import com.vaadin.server.PaintTarget;
  import com.vaadin.server.VaadinService;
  
  
  /**
   * Magnolia 6 - Vaadin 8 extended CKEditorTextField for custom made Magnolia plugins.
   * By default CKEditor wrapper for Vaadin does not allow
   * custom events between CKEditor plugins and server.
   */
  public class MagnoliaCKEditorTextField extends CKEditorTextField implements MagnoliaCKEditorTextFieldEvents {
  
      private String fireEvent;
      private String fireEventValue;
      private String[] customEvents;
      private Map<String, String> serverPlugins;
      private List<PluginListener> listeners = new ArrayList<>();
      private MagnoliaCKEditorConfig config;
  
      public void addListener(PluginListener listener) {
          listeners.add(listener);
      }
  
      public MagnoliaCKEditorTextField(MagnoliaCKEditorConfig config) {
          super(config);
          this.config = config;
          serverPlugins = config.getExternalPlugins();
          customEvents = config.getListenedEvents();
          config.setContentsCss(getPathToVaadin() + "/themes/resurface/richtextfield-contents/styles.css");
      }
  
      @Override
      public void changeVariables(Object source, Map<String, Object> variables) {
          super.changeVariables(source, variables);
  
          if (isEmpty()) {
              this.setValue(null, true);
          }
  
          Optional.ofNullable(config).ifPresent(c -> {
              // See if client sends events
              Arrays.stream(c.getListenedEvents())
                      .filter(Objects::nonNull)
                      .forEach(eventName -> {
                          final String eventNameResolved = VAR_EVENT_PREFIX + eventName;
                          if (variables.containsKey(eventNameResolved)) {
                              listeners.forEach(l -> l.onPluginEvent(eventName, variables.get(eventNameResolved).toString()));
                          }
                      });
         });
     }
     @Override
     public void firePluginEvent(String event, String value) {
         fireEvent = event;
         fireEventValue = value;
         markAsDirty();
     }
 
     @Override
     public void paintContent(PaintTarget target) throws PaintException {
         super.paintContent(target);
 
         if (serverPlugins != null) {
             target.addAttribute(VAR_SERVERPLUGINS, serverPlugins);
         }
 
         // tell client that server is interested of these events
         if (customEvents != null) {
             target.addAttribute(VAR_EVENTNAMES, customEvents);
         }
 
         // send event to plugin
         if (fireEvent != null && fireEventValue != null) {
             target.addAttribute(VAR_FIRE_PLUGIN_EVENT, fireEvent);
             target.addAttribute(VAR_FIRE_PLUGIN_EVENT_VALUE, fireEventValue);
             fireEvent = null;
             fireEventValue = null;
         }
     }
 
     @Override
     public void setHeight(float height, Unit unit) {
         super.setHeight(height, unit);
     }
 
     @Override
     public boolean isEmpty() {
         return StringUtils.isEmpty(getValue());
     }
 
     private String getPathToVaadin() {
         final URI location = Page.getCurrent().getLocation();
         return location.getScheme()  + "://" +location.getAuthority() + VaadinService.getCurrentRequest().getContextPath() + "/VAADIN";
     }
 }