/*
    * This file is part of ***  M y C o R e  ***
    * See http://www.mycore.de/ for details.
    *
    * MyCoRe is free software: you can redistribute it and/or modify
    * it under the terms of the GNU General Public License as published by
    * the Free Software Foundation, either version 3 of the License, or
    * (at your option) any later version.
    *
   * MyCoRe is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with MyCoRe.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  package org.mycore.solr.classification;
  
  import java.net.URI;
  import java.util.Collection;
  import java.util.List;
  import java.util.SortedSet;
  
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  import org.apache.solr.client.solrj.SolrClient;
  import org.apache.solr.client.solrj.impl.HttpSolrClient;
  import org.mycore.datamodel.classifications2.MCRCategory;
  import org.mycore.datamodel.classifications2.MCRCategoryDAOFactory;
  import org.mycore.datamodel.classifications2.MCRCategoryID;
  import org.mycore.datamodel.classifications2.MCRLabel;
  import org.mycore.datamodel.classifications2.impl.MCRCategoryDAOImpl;
  import org.mycore.datamodel.classifications2.impl.MCRCategoryImpl;
  import org.mycore.solr.search.MCRSolrSearchUtils;
  
  /**
   * Extends the default category dao with solr support. Every create/write/delete operation
   * on a classification/category results in a solr reindex additionally.
   * 
   * @author Matthias Eichner
   */
  public class MCRSolrCategoryDAO extends MCRCategoryDAOImpl {
  
      private static final Logger LOGGER = LogManager.getLogger(MCRSolrCategoryDAO.class);
  
      @Override
      public MCRCategory setURI(MCRCategoryID id, URI uri) {
          MCRCategory category = super.setURI(id, uri);
          MCRSolrClassificationUtil.reindex(category);
          return category;
      }
  
      @Override
      public MCRCategory setLabel(MCRCategoryID id, MCRLabel label) {
          MCRCategory category = super.setLabel(id, label);
          MCRSolrClassificationUtil.reindex(category);
          return category;
      }
  
      @Override
      public MCRCategory setLabels(MCRCategoryID id, SortedSet<MCRLabel> labels) {
          MCRCategory category = super.setLabels(id, labels);
          MCRSolrClassificationUtil.reindex(category);
          return category;
      }
  
      @Override
      public MCRCategory removeLabel(MCRCategoryID id, String lang) {
          MCRCategory category = super.removeLabel(id, lang);
          MCRSolrClassificationUtil.reindex(category);
          return category;
      }
  
      @Override
      public MCRCategory addCategory(MCRCategoryID parentID, MCRCategory category, int position) {
          MCRCategory parent = super.addCategory(parentID, category, position);
          MCRSolrClassificationUtil.reindex(category, parent);
          return parent;
      }
  
      @Override
      public void deleteCategory(MCRCategoryID id) {
          MCRCategory category = MCRCategoryDAOFactory.getInstance().getCategory(id, 0);
          MCRCategory parent = category.getParent();
          super.deleteCategory(id);
          solrDelete(id, parent);
      }
  
      protected void solrDelete(MCRCategoryID id, MCRCategory parent) {
          try {
              // remove all descendants and itself
              HttpSolrClient solrClient = MCRSolrClassificationUtil.getCore().getClient();
              List<String> toDelete = MCRSolrSearchUtils.listIDs(solrClient,
                  "ancestor:" + MCRSolrClassificationUtil.encodeCategoryId(id));
              toDelete.add(id.toString());
              solrClient.deleteById(toDelete);
              // reindex parent
             MCRSolrClassificationUtil.reindex(parent);
         } catch (Exception exc) {
             LOGGER.error("Solr: unable to delete categories of parent {}", id);
         }
     }
 
     @Override
     public void moveCategory(MCRCategoryID id, MCRCategoryID newParentID, int index) {
         super.moveCategory(id, newParentID, index);
         solrMove(id, newParentID, index);
     }
 
     protected void solrMove(MCRCategoryID id, MCRCategoryID newParentID, int index) {
         try {
             SolrClient solrClient = MCRSolrClassificationUtil.getCore().getClient();
             List<String> reindexList = MCRSolrSearchUtils.listIDs(solrClient,
                 "ancestor:" + MCRSolrClassificationUtil.encodeCategoryId(id));
             reindexList.add(id.toString());
             reindexList.add(newParentID.toString());
             MCRSolrClassificationUtil.reindex(MCRSolrClassificationUtil.fromString(reindexList));
         } catch (Exception exc) {
             LOGGER.error("Solr: unable to move categories of category {} to {}", id, newParentID);
         }
     }
 
     @Override
     public Collection<MCRCategoryImpl> replaceCategory(MCRCategory newCategory) throws IllegalArgumentException {
         Collection<MCRCategoryImpl> replacedCategories = super.replaceCategory(newCategory);
         // remove all old categories
         solrDelete(newCategory.getId(), newCategory.getParent());
         // reindex all new
         MCRSolrClassificationUtil.reindex(replacedCategories.toArray(new MCRCategoryImpl[replacedCategories.size()]));
         return replacedCategories;
     }
 
 }