/**
    * This file Copyright (c) 2012-2014 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.actionbar;
  
  import info.magnolia.ui.actionbar.definition.ActionbarDefinition;
  import info.magnolia.ui.actionbar.definition.ActionbarGroupDefinition;
  import info.magnolia.ui.actionbar.definition.ActionbarItemDefinition;
  import info.magnolia.ui.actionbar.definition.ActionbarSectionDefinition;
  import info.magnolia.ui.api.action.ActionDefinition;
  import info.magnolia.ui.vaadin.gwt.client.actionbar.shared.ActionbarItem;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  
  import javax.inject.Inject;
  
  import org.apache.commons.lang.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.vaadin.server.Resource;
  
  /**
   * Default presenter for an action bar.
   */
  public class ActionbarPresenter implements ActionbarView.Listener {
  
      /**
       * Listener interface for the Actionbar.
       */
      public interface Listener {
  
          void onActionbarItemClicked(String itemName);
      }
  
      private static final Logger log = LoggerFactory.getLogger(ActionbarPresenter.class);
  
      private ActionbarDefinition definition;
  
      private Map<String, ActionDefinition> actions;
  
      private ActionbarView view;
  
      private Listener listener;
  
      @Inject
      public ActionbarPresenter(ActionbarView view) {
          this.view = view;
          view.setListener(this);
      }
  
      public void setListener(Listener listener) {
          this.listener = listener;
      }
  
      /**
       * Initializes an action bar with the given definition and returns the view for the parent to add it.
       */
      public ActionbarView start(ActionbarDefinition definition, Map<String, ActionDefinition> actions) {
          this.definition = definition;
          this.actions = actions;
  
          if (definition != null) {
  
              // build action bar structure from definition
              for (ActionbarSectionDefinition section : definition.getSections()) {
                  view.addSection(section.getName(), section.getLabel());
                 List<String> actionNames = new ArrayList<String>();
 
                 for (ActionbarGroupDefinition group : section.getGroups()) {
                     // standalone groups make no sense
                     log.debug("Group actions: " + group.getItems());
 
                     for (ActionbarItemDefinition action : group.getItems()) {
                         if (actionNames.contains(action.getName())) {
                             log.warn("Action was not added: an action with name " + action + "': was already added to the section" + section.getName() + ".");
                             continue;
                         }
                         actionNames.add(action.getName());
                         addActionItem(action.getName(), group.getName(), section.getName());
                     }
                 }
             }
         } else {
             log.debug("No actionbar definition found. This will result in an empty action bar. Is that intended?");
         }
         return view;
     }
 
     private void addActionItem(String actionName, String groupName, String sectionName) {
 
         ActionDefinition actionDefinition = actions.get(actionName);
         if (actionDefinition != null) {
             String label = actionDefinition.getLabel();
             if (StringUtils.isBlank(label)) {
                 label = actionName;
             }
             String icon = actionDefinition.getIcon();
 
             // only icons from icon-fonts currently work
             ActionbarItem item = new ActionbarItem(actionName, label, icon, groupName);
             view.addAction(item, sectionName);
         }
     }
 
     public void setPreview(final Resource previewResource) {
         view.setPreview(previewResource);
     }
 
     // METHODS DELEGATING TO THE VIEW
 
     public void enable(String... actionNames) {
         if (view != null) {
             for (String action : actionNames) {
                 view.setActionEnabled(action, true);
             }
         }
     }
 
     public void disable(String... actionNames) {
         if (view != null) {
             for (String action : actionNames) {
                 view.setActionEnabled(action, false);
             }
         }
     }
 
     public void enableGroup(String groupName) {
         if (view != null) {
             view.setGroupEnabled(groupName, true);
         }
     }
 
     public void disableGroup(String groupName) {
         if (view != null) {
             view.setGroupEnabled(groupName, false);
         }
     }
 
     public void enableGroup(String groupName, String sectionName) {
         if (view != null) {
             view.setGroupEnabled(groupName, sectionName, true);
         }
     }
 
     public void disableGroup(String groupName, String sectionName) {
         if (view != null) {
             view.setGroupEnabled(groupName, sectionName, false);
         }
     }
 
     public void showSection(String... sectionNames) {
         if (view != null) {
             for (String section : sectionNames) {
                 view.setSectionVisible(section, true);
             }
         }
     }
 
     public void hideSection(String... sectionNames) {
         if (view != null) {
             for (String section : sectionNames) {
                 view.setSectionVisible(section, false);
             }
         }
     }
 
     // VIEW LISTENER
 
     @Override
     public void onActionbarItemClicked(String actionToken) {
         String actionName = getActionName(actionToken);
         listener.onActionbarItemClicked(actionName);
     }
 
     private String getActionName(String actionToken) {
         final String[] chunks = actionToken.split(":");
         if (chunks.length != 2) {
             log.warn("Invalid actionToken [{}]: it is expected to be in the form sectionName:actionName. Action name cannot be resolved. Please check actionbar definition.", actionToken);
             return null;
         }
         final String sectionName = chunks[0];
         final String actionName = chunks[1];
 
         return actionName;
     }
 }