/**
    * This file Copyright (c) 2012-2013 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.security.app.dialog.field;
  
  import info.magnolia.cms.util.QueryUtil;
  import info.magnolia.jcr.iterator.FilteringPropertyIterator;
  import info.magnolia.jcr.predicate.JCRMgnlPropertyHidingPredicate;
  import info.magnolia.jcr.util.NodeTypes;
  import info.magnolia.objectfactory.ComponentProvider;
  import info.magnolia.repository.RepositoryConstants;
  import info.magnolia.ui.form.field.definition.SelectFieldOptionDefinition;
  import info.magnolia.ui.form.field.factory.TwinColSelectFieldFactory;
  import info.magnolia.ui.form.field.transformer.Transformer;
  import info.magnolia.ui.vaadin.integration.jcr.JcrNodeAdapter;
  
  import java.util.ArrayList;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  import javax.inject.Inject;
  import javax.jcr.Node;
  import javax.jcr.NodeIterator;
  import javax.jcr.Property;
  import javax.jcr.PropertyIterator;
  import javax.jcr.RepositoryException;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.vaadin.data.Item;
  import com.vaadin.ui.AbstractSelect;
  import com.vaadin.ui.TwinColSelect;
  
  /**
   * GUI builder for the Group Management field.
   */
  public class GroupManagementFieldFactory extends TwinColSelectFieldFactory<GroupManagementFieldDefinition> {
  
      /**
       * Internal bean to represent basic group data.
       */
      public static class Group {
          public String name;
          public String uuid;
  
          public Group(String name, String uuid) {
              this.name = name;
              this.uuid = uuid;
          }
      }
  
      private static final Logger log = LoggerFactory.getLogger(GroupManagementFieldFactory.class);
      private ComponentProvider componentProvider;
  
      @Inject
      public GroupManagementFieldFactory(GroupManagementFieldDefinition definition, Item relatedFieldItem, ComponentProvider componentProvider) {
          super(definition, relatedFieldItem, componentProvider);
          this.definition.setOptions(getSelectFieldOptionDefinition());
          this.componentProvider = componentProvider;
      }
  
      @Override
      protected AbstractSelect createFieldComponent() {
          super.createFieldComponent();
          select.setMultiSelect(true);
          select.setNullSelectionAllowed(true);
          select.setImmediate(true);
         return select;
     }
 
     @Override
     protected AbstractSelect createSelectionField() {
         return new TwinColSelect() {
 
             @Override
             public String getConnectorId() {
                 return super.getConnectorId();
             }
 
             /* (non-Javadoc)
              * @see com.vaadin.ui.AbstractComponent#isVisible()
              */
             @Override
             public boolean isVisible() {
                 return super.isVisible();
             }
         };
     }
 
     /**
      * Returns the available groups with those already assigned marked selected,
      * according to the current node.
      */
     @Override
     public List<SelectFieldOptionDefinition> getSelectFieldOptionDefinition() {
         List<SelectFieldOptionDefinition> options = new ArrayList<SelectFieldOptionDefinition>();
         List<Group> allGroups = getAllGroups(); // name,uuid
         Set<String> assignedGroups = getAssignedGroups();
         String currentUUID = null;
         try {
             currentUUID = ((JcrNodeAdapter) item).getJcrItem().getIdentifier();
         } catch (RepositoryException e) {
             // nothing to do
         }
         for (Group group : allGroups) {
             SelectFieldOptionDefinition option = new SelectFieldOptionDefinition();
             option.setValue(group.uuid);
             option.setLabel(group.name);
             if (assignedGroups.contains(group.uuid)) {
                 option.setSelected(true);
             }
             if (!group.uuid.equals(currentUUID)) {
                 // we don't want the group to be assigned to itself, do we?
                 options.add(option);
             }
         }
         return options;
     }
 
     private List<Group> getAllGroups() {
         List<Group> groups = new ArrayList<Group>();
         try {
             NodeIterator ni = QueryUtil.search(RepositoryConstants.USER_GROUPS, "SELECT * FROM [" + NodeTypes.Group.NAME + "] ORDER BY name()");
 
             while (ni.hasNext()) {
                 Node n = ni.nextNode();
                 String name = n.getName();
                 String uuid = n.getIdentifier();
                 groups.add(new Group(name, uuid));
             }
         } catch (RepositoryException e) {
             log.error("Cannot read groups from the [" + RepositoryConstants.USER_GROUPS + "] workspace.", e);
         }
         return groups;
     }
 
     private Set<String> getAssignedGroups() {
         Set<String> groups = new HashSet<String>();
         try {
             Node mainNode = ((JcrNodeAdapter) item).getJcrItem();
             if (mainNode.hasNode("groups")) {
                 Node groupsNode = mainNode.getNode("groups");
                 if (groupsNode == null) {
                     // shouldn't happen, just in case
                     return groups;
                 }
                 for (PropertyIterator iter = new FilteringPropertyIterator(groupsNode.getProperties(), new JCRMgnlPropertyHidingPredicate()); iter.hasNext();) {
                     Property p = iter.nextProperty();
                     groups.add(p.getString());
 
                 }
             }
         } catch (RepositoryException re) {
             log.error("Cannot read assigned groups.", re);
         }
         return groups;
     }
 
     /**
      * Create a new Instance of {@link Transformer}.
      */
     @Override
     protected Transformer<?> initializeTransformer(Class<? extends Transformer<?>> transformerClass) {
         return this.componentProvider.newInstance(transformerClass, item, definition, HashSet.class, getAssignedGroups(), "groups");
     }
 
 }