/**
    * This file Copyright (c) 2014-2018 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.dam.app.assets.field;
  
  import info.magnolia.cms.security.Permission;
  import info.magnolia.cms.security.PermissionUtil;
  import info.magnolia.cms.util.PathUtil;
  import info.magnolia.context.MgnlContext;
  import info.magnolia.event.EventBus;
  import info.magnolia.jcr.util.NodeTypes;
  import info.magnolia.jcr.util.NodeUtil;
  import info.magnolia.ui.api.action.ActionDefinition;
  import info.magnolia.ui.api.event.ChooseDialogEventBus;
  import info.magnolia.ui.api.view.View;
  import info.magnolia.ui.dialog.actionarea.ActionListener;
  import info.magnolia.ui.dialog.actionarea.renderer.DefaultEditorActionRenderer;
  import info.magnolia.ui.framework.action.AbstractRepositoryAction;
  import info.magnolia.ui.vaadin.integration.jcr.JcrNodeItemId;
  import info.magnolia.ui.workbench.event.SelectionChangedEvent;
  
  import java.util.Set;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.jcr.RepositoryException;
  
  import com.vaadin.ui.Button;
  
  /**
   * Extension of the default renderer to work around lack of availability checking for choose-dialog actions.
   * — in particular, to listen to SelectionChangedEvents, ChooseDialogPresenter should first be relocated to ui-contentapp.
   */
  public class UploadAndEditActionRenderer extends DefaultEditorActionRenderer {
  
      private final EventBus chooseDialogEventBus;
  
      @Inject
      public UploadAndEditActionRenderer(@Named(ChooseDialogEventBus.NAME) EventBus chooseDialogEventBus) {
          this.chooseDialogEventBus = chooseDialogEventBus;
      }
  
      @Override
      public View start(ActionDefinition definition, ActionListener listener) {
          View view = super.start(definition, listener);
          final Button button = (Button) view.asVaadinComponent();
          button.addClickListener(event -> event.getButton().setEnabled(true));
  
          chooseDialogEventBus.addHandler(SelectionChangedEvent.class, event -> {
              // inner availability logic here mirrors the one in UpladAssetActionRenderer (in use for DirectUploadAction)
              Set<Object> itemIds = event.getItemIds();
              if (itemIds == null || itemIds.isEmpty()) {
                  return;
              }
              try {
                  JcrNodeItemId nodeItemId = (JcrNodeItemId) itemIds.iterator().next();
                  javax.jcr.Node node = MgnlContext.getJCRSession(nodeItemId.getWorkspace()).getNodeByIdentifier(nodeItemId.getUuid());
                  boolean uploadAllowed = itemIds.size() == 1;
                  if (uploadAllowed) {
                      uploadAllowed = NodeUtil.isNodeType(node, NodeTypes.Folder.NAME) || NodeUtil.getAncestors(node).isEmpty();
                      // Upload is allowed only if user has WRITE permission on child path which is intended to create (checking "untitled" as default) under the current path.
                      uploadAllowed &= PermissionUtil.isGranted(node, Permission.WRITE)
                              && PermissionUtil.isGranted(node.getSession(), PathUtil.createPath(node.getPath(), AbstractRepositoryAction.DEFAULT_NEW_ITEM_NAME), Permission.WRITE);
                  }
                  button.setEnabled(uploadAllowed);
              } catch (RepositoryException e) {
                  button.setEnabled(false);
              }
          });
         return view;
     }
 }