/**
    * 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.pages.app;
  
  import info.magnolia.jcr.util.NodeNameHelper;
  import info.magnolia.jcr.util.NodeTypes;
  import info.magnolia.jcr.util.NodeUtil;
  import info.magnolia.registry.RegistrationException;
  import info.magnolia.rendering.template.TemplateDefinition;
  import info.magnolia.rendering.template.assignment.TemplateDefinitionAssignment;
  import info.magnolia.ui.contentapp.action.clipboard.JcrClipboard;
  import info.magnolia.ui.contentapp.browser.ItemInteractionAvailability;
  import info.magnolia.ui.datasource.jcr.JcrDatasource;
  
  import java.util.Collection;
  import java.util.stream.Collectors;
  
  import javax.inject.Inject;
  import javax.jcr.Item;
  import javax.jcr.Node;
  
  import com.machinezoo.noexception.Exceptions;
  
  /**
   * Content clipboard which checks template availability to see
   * whether the copied pages can be pasted to given location.
   */
  public class PageContentClipboard extends JcrClipboard {
  
      private TemplateDefinitionAssignment templateAssignment;
  
      @Inject
      public PageContentClipboard(ItemInteractionAvailability<Item> itemInteractionAvailability,
                                  NodeNameHelper nodeNameHelper,
                                  TemplateDefinitionAssignment templateAssignment, JcrDatasource jcrDatasource) {
          super(itemInteractionAvailability, nodeNameHelper, jcrDatasource);
          this.templateAssignment = templateAssignment;
      }
  
      @Override
      protected boolean canPasteInto(final Item source, final Item destination) {
          // Check whether copied Item is not marked as deleted
          Boolean isSourceMarkedAsDeleted = Exceptions.wrap().get(() -> NodeUtil.hasMixin((Node) source, NodeTypes.Deleted.NAME));
          if (isSourceMarkedAsDeleted || !super.canPasteInto(source, destination)) {
              return false;
          }
  
          // Both source and destination are page nodes
          Node sourcePage = (Node) source;
          Node destinationPage = (Node) destination;
  
          // Fetch available template ids for destination page
          Collection<String> availableTemplates = templateAssignment.getAvailableTemplates(destinationPage).stream()
                  .map(TemplateDefinition::getId)
                  .collect(Collectors.toList());
  
          // If the source page has a template id that is among assignable available templates for destination, the
          // source can be pasted into the destination
          try {
              String sourcePageTemplateDefinitionId = templateAssignment.getAssignedTemplateDefinition(sourcePage).getId();
              return availableTemplates.stream().anyMatch(availableTemplate -> availableTemplate.equals(sourcePageTemplateDefinitionId));
          } catch (RegistrationException e) {
              throw new RuntimeException(e);
          }
      }
  
  }