/*
    * 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.datamodel.classifications2.impl;
  
  import java.net.URI;
  import java.util.ArrayList;
  import java.util.Locale;
  import java.util.Optional;
  
  import org.mycore.datamodel.classifications2.MCRCategory;
  import org.mycore.datamodel.classifications2.MCRCategoryID;
  import org.mycore.datamodel.classifications2.MCRLabel;
  
  /**
   * Used for specific JPA queries only. Do not use directly!
   * @author Thomas Scheffler (yagee)
   * @since 2016.04
   */
  public class MCRCategoryDTO {
      public static final String SELECT = "select new org.mycore.datamodel.classifications2.impl.MCRCategoryDTO"
          + "(cat.internalID, cat.URI, cat.id, cat.left, cat.right, cat.level, labels.lang, labels.text,"
          + " labels.description) from MCRCategoryImpl cat LEFT OUTER JOIN cat.labels labels";
  
      public static final String CAT_SELECT = "select new org.mycore.datamodel.classifications2.impl.MCRCategoryDTO"
          + "(cat.internalID, cat.URI, cat.id, cat.left, cat.right, cat.level) from MCRCategoryImpl cat";
  
      public static final String LRL_SELECT = "select new org.mycore.datamodel.classifications2.impl.MCRCategoryDTO"
          + "(cat.left, cat.right, cat.level) from MCRCategoryImpl cat";
  
      int internalID;
  
      URI uri;
  
      MCRCategoryID id;
  
      int leftValue, level, rightValue;
  
      String lang, text, description;
  
      public MCRCategoryDTO(int internalID, URI uri, MCRCategoryID id, int leftValue, int rightValue,
          int level, String lang, String text, String description) {
          this(internalID, uri, id, leftValue, rightValue, level);
          this.lang = lang;
          this.text = text;
          this.description = description;
      }
  
      public MCRCategoryDTO(int internalID, URI uri, MCRCategoryID id, int leftValue, int rightValue,
          int level) {
          this(leftValue, rightValue, level);
          this.internalID = internalID;
          this.uri = uri;
          this.id = id;
      }
  
      public MCRCategoryDTO(int leftValue, int rightValue, int level) {
          this.leftValue = leftValue;
          this.rightValue = rightValue;
          this.level = level;
      }
  
      public MCRCategoryImpl merge(MCRCategoryImpl predecessor) {
          if (predecessor == null) {
              return toCategory();
          }
          if (predecessor.getInternalID() == internalID) {
              //only add label
              return appendLabel(predecessor);
          }
          MCRCategoryImpl cat = toCategory();
          MCRCategory parent = predecessor;
          while (parent.getLevel() >= level) {
              parent = parent.getParent();
          }
          parent.getChildren().add(cat);
          cat.setLevel(level); //is reset to parent.level+1 in step before
          return cat;
      }
  
      private MCRCategoryImpl toCategory() {
          MCRCategoryImpl cat = new MCRCategoryImpl();
          cat.setInternalID(internalID);
          cat.setURI(uri);
         cat.setId(id);
         if (cat.getId().isRootID()) {
             cat.setRoot(cat);
         }
         cat.setLeft(leftValue);
         cat.setRight(rightValue);
         cat.setLevel(level);
         cat.setChildren(new ArrayList<>());
         return appendLabel(cat);
     }
 
     private MCRCategoryImpl appendLabel(MCRCategoryImpl cat) {
         if (lang != null) {
             MCRLabel label = new MCRLabel(lang, text,
                 Optional.ofNullable(description).filter(s -> !s.isEmpty()).orElse(null));
             cat.getLabels().add(label);
         }
         return cat;
     }
 
     @Override
     public String toString() {
         return String.format(Locale.ROOT,
             "MCRCategoryDTO [internalID=%s, id=%s, uri=%s, leftValue=%s, level=%s, "
                 + "rightValue=%s, lang=%s, text=%s, description=%s]",
             internalID, id, uri, leftValue, level, rightValue, lang, text, description);
     }
 
     public int getInternalID() {
         return internalID;
     }
 
 }