/**
    * This file Copyright (c) 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.ui.contentapp;
  
  import info.magnolia.jcr.RuntimeRepositoryException;
  import info.magnolia.jcr.util.NodeNameHelper;
  import info.magnolia.jcr.util.NodeUtil;
  import info.magnolia.ui.contentapp.detail.ContentDetailSubApp;
  import info.magnolia.ui.editor.JcrNodeFromLocationResolutionDefinition;
  import info.magnolia.ui.datasource.jcr.JcrDatasource;
  import info.magnolia.ui.editor.ItemProviderStrategy;
  import info.magnolia.ui.datasource.ItemResolver;
  import info.magnolia.ui.contentapp.version.VersionResolver;
  
  import java.util.Optional;
  
  import javax.inject.Inject;
  import javax.jcr.Node;
  import javax.jcr.RepositoryException;
  import javax.jcr.Session;
  
  /**
   * JCR Node-specific item resolution strategy, attempts to get node
   * coordinates from the current Admincentral location.
   */
  public class ResolveJcrNodeFromLocationContext implements ItemProviderStrategy<Node, ContentDetailSubApp.DetailLocation> {
  
      private final JcrNodeFromLocationResolutionDefinition definition;
      private final ItemResolver<Node> itemResolver;
      private final VersionResolver<Node> versionResolver;
      private final JcrDatasource datasource;
      private final NodeNameHelper nodeNameHelper;
  
      @Inject
      public ResolveJcrNodeFromLocationContext(
              JcrNodeFromLocationResolutionDefinition definition,
              JcrDatasource datasource,
              ItemResolver<Node> itemResolver,
              VersionResolver<Node> versionResolver,
              NodeNameHelper nodeNameHelper) {
          this.definition = definition;
          this.datasource = datasource;
          this.itemResolver = itemResolver;
          this.versionResolver = versionResolver;
          this.nodeNameHelper = nodeNameHelper;
      }
  
      @Override
      public Optional<Node> read(ContentDetailSubApp.DetailLocation location) {
          return resolveNode(location);
      }
  
      private Optional<Node> resolveNode(ContentDetailSubApp.DetailLocation location) {
          final String nodePath = location.getNodePath();
          final String viewType = location.getViewType();
  
          switch (viewType) {
          case "add":
              return Optional.ofNullable(createNewNode(nodePath));
          case "version":
              return versionResolver.getVersion(nodePath, location.getVersion());
          case "edit":
          case "view":
          default:
              return itemResolver.getItemById(nodePath);
          }
      }
  
     private Node createNewNode(String path) {
         final Session jcrSession;
         try {
             jcrSession = datasource.getJCRSession();
             Node parent = jcrSession.getNode(path);
             String name = nodeNameHelper.getUniqueName(parent, nodeNameHelper.getValidatedName(null));
             return NodeUtil.createPath(parent, name, definition.getNodeType());
         } catch (RepositoryException e) {
             throw new RuntimeRepositoryException(e);
         }
     }
 }