/**
    * 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 static info.magnolia.ui.contentapp.detail.ContentDetailSubApp.LocationContext;
  
  import info.magnolia.context.Context;
  import info.magnolia.jcr.util.NodeUtil;
  import info.magnolia.ui.contentapp.detail.ContentDetailSubApp;
  import info.magnolia.ui.databinding.JcrNodeFromLocationResolutionDefinition;
  import info.magnolia.ui.framework.databinding.ItemProviderStrategy;
  import info.magnolia.ui.framework.datasource.DatasourceComponent;
  import info.magnolia.ui.framework.datasource.components.ItemResolver;
  
  import java.util.Optional;
  
  import javax.inject.Provider;
  import javax.jcr.Node;
  import javax.jcr.Session;
  
  import lombok.SneakyThrows;
  
  /**
   * JCR Node-specific item resolution strategy, attempts to get node
   * coordinates from the current Admincentral location.
   */
  public class ResolveJcrNodeFromLocationContext implements ItemProviderStrategy<Node> {
  
      private final JcrNodeFromLocationResolutionDefinition definition;
      private final LocationContext locationContext;
      private final Provider<Context> contextProvider;
      private final ItemResolver<Node> itemResolver;
  
      public ResolveJcrNodeFromLocationContext(
              JcrNodeFromLocationResolutionDefinition definition,
              LocationContext locationContext,
              Provider<Context> contextProvider,
              @DatasourceComponent ItemResolver<Node> itemResolver) {
          this.definition = definition;
          this.locationContext = locationContext;
          this.contextProvider = contextProvider;
          this.itemResolver = itemResolver;
      }
  
      @Override
      public Optional<Node> read() {
          return locationContext.location()
                  .value()
                  .flatMap(this::resolveNode);
      }
  
      private Optional<Node> resolveNode(ContentDetailSubApp.DetailLocation location) {
          final String nodePath = location.getNodePath();
          final String viewType = location.getViewType();
  
          switch (viewType) {
          case "add":
              return Optional.ofNullable(this.createNode(String.format("%s/%s", nodePath, "untitled")));
          case "edit": case "view":
              return itemResolver.getItemByPath(nodePath);
          default:
              return Optional.empty();
          }
      }
  
      @SneakyThrows
      private Node createNode(String path) {
          final Session jcrSession = this.contextProvider.get().getJCRSession(this.definition.getWorkspace());
         return NodeUtil.createPath(jcrSession.getRootNode(), path, definition.getNodeType());
     }
 }