/**
    * This file Copyright (c) 2019 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.datasource.jcr;
  
  import info.magnolia.context.Context;
  import info.magnolia.jcr.decoration.AbstractContentDecorator;
  import info.magnolia.jcr.util.NodeUtil;
  import info.magnolia.ui.contentapp.Datasource;
  
  import java.util.Collection;
  
  import javax.inject.Inject;
  import javax.inject.Provider;
  import javax.jcr.InvalidItemStateException;
  import javax.jcr.Item;
  import javax.jcr.Node;
  import javax.jcr.Property;
  import javax.jcr.RepositoryException;
  import javax.jcr.Session;
  
  import com.machinezoo.noexception.Exceptions;
  import com.vaadin.shared.ui.grid.DropLocation;
  
  /**
   * {@link info.magnolia.jcr.decoration.ContentDecorator} for JCR operations in content apps.
   */
  public class JcrDatasource extends AbstractContentDecorator implements Datasource<Item> {
  
      private static final String TMP_DELETED = "mgnl:tmpDeleted";
      static final String TMP_DELETED_NODE = TMP_DELETED + "$Node";
      static final String TMP_DELETED_PROPERTY = TMP_DELETED + "$Property";
  
      private final Provider<Context> contextProvider;
      private final JcrDatasourceDefinition datasourceDefinition;
  
      @Inject
      public JcrDatasource(Provider<Context> contextProvider, JcrDatasourceDefinition datasourceDefinition) {
          this.contextProvider = contextProvider;
          this.datasourceDefinition = datasourceDefinition;
      }
  
      @Override
      public boolean isMultipleWrapEnabled() {
          return false;
      }
  
      @Override
      public JcrSessionWrapper wrapSession(Session session) {
          return new JcrSessionWrapper(session, this);
      }
  
      @Override
      public JcrNodeWrapper wrapNode(Node node) {
          return new JcrNodeWrapper(node, this);
      }
  
      @Override
      public boolean evaluateNode(Node node) {
          return super.evaluateNode(node) && !Exceptions.wrap().get(node::getName).equals(TMP_DELETED_NODE);
      }
  
      @Override
      public JcrPropertyWrapper wrapProperty(Property property) {
          return new JcrPropertyWrapper(property, this);
      }
  
      @Override
      public boolean evaluateProperty(Property property) {
         String propertyName = Exceptions.wrap().get(property::getName);
         return super.evaluateProperty(property) && !propertyName.equals(TMP_DELETED_PROPERTY);
     }
 
     public Node getRoot() {
         return Exceptions.wrap().get(() -> getJCRSession().getNode(this.datasourceDefinition.getRootPath()));
     }
 
     public JcrSessionWrapper getJCRSession() throws RepositoryException {
         Session session = contextProvider.get().getJCRSession(datasourceDefinition.getWorkspace());
         return wrapSession(session);
     }
 
     public Item wrapItem(Item item) {
         return item instanceof Node ? wrapNode((Node) item) : wrapProperty((Property) item);
     }
 
     boolean exists(Item item) throws RepositoryException {
         try {
             item.getName();
             return true;
         } catch (InvalidItemStateException e) {
             return false;
         }
     }
 
     @Override
     public void moveItems(Collection<Item> items, Item target, DropLocation dropLocation) {
         items.forEach(Exceptions.wrap().consumer(item -> {
             Node targetNode = (Node) target;
             switch (dropLocation) {
             case ABOVE:
                 NodeUtil.moveNodeBefore((Node) item, targetNode);
                 break;
             case BELOW:
                 NodeUtil.moveNodeAfter((Node) item, targetNode);
                 break;
             case ON_TOP:
                 if (item.isNode()) {
                     NodeUtil.moveNode((Node) item, targetNode);
                 } else {
                     NodeUtil.moveProperty((Property) item, targetNode);
                 }
                 break;
             }
             commit(target);
         }));
     }
 
     @Override
     public void commit(Item item) {
         Exceptions.wrap().run(() -> item.getSession().save());
     }
 
     @Override
     public void remove(Item item) {
         Exceptions.wrap().run(item::remove);
     }
 }