/*
    * 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.frontend.classeditor;
  
  import static org.mycore.frontend.classeditor.json.MCRJSONCategoryHelper.PROP_HAS_CHILDREN;
  import static org.mycore.frontend.classeditor.json.MCRJSONCategoryHelper.PROP_HAS_LINK;
  import static org.mycore.frontend.classeditor.json.MCRJSONCategoryHelper.PROP_ID;
  import static org.mycore.frontend.classeditor.json.MCRJSONCategoryHelper.PROP_LABELS;
  import static org.mycore.frontend.classeditor.json.MCRJSONCategoryHelper.PROP_URISTR;
  
  import java.lang.reflect.Type;
  import java.net.URI;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  import java.util.SortedSet;
  
  import org.mycore.common.MCRJSONTypeAdapter;
  import org.mycore.datamodel.classifications2.MCRCategory;
  import org.mycore.datamodel.classifications2.MCRCategoryID;
  import org.mycore.datamodel.classifications2.MCRLabel;
  import org.mycore.frontend.classeditor.json.MCRJSONCategory;
  import org.mycore.frontend.classeditor.wrapper.MCRCategoryListWrapper;
  import org.mycore.frontend.classeditor.wrapper.MCRLabelSetWrapper;
  
  import com.google.gson.JsonArray;
  import com.google.gson.JsonDeserializationContext;
  import com.google.gson.JsonElement;
  import com.google.gson.JsonObject;
  import com.google.gson.JsonParseException;
  import com.google.gson.JsonSerializationContext;
  
  import jakarta.ws.rs.WebApplicationException;
  
  public class MCRCategoryListTypeAdapter extends MCRJSONTypeAdapter<MCRCategoryListWrapper> {
      private JsonSerializationContext serializationContext;
  
      @Override
      public JsonElement serialize(MCRCategoryListWrapper categListWrapper, Type typeOfSrc,
          JsonSerializationContext context) {
          this.serializationContext = context;
          Map<MCRCategoryID, Boolean> linkMap = categListWrapper.getLinkMap();
  
          if (linkMap == null) {
              throw new WebApplicationException("For serializing link map must not be null.");
          }
  
          return categListToJsonArray(categListWrapper.getList(), linkMap);
      }
  
      private JsonElement categListToJsonArray(List<MCRCategory> categList, Map<MCRCategoryID, Boolean> linkMap) {
          JsonArray categJsonArray = new JsonArray();
          for (MCRCategory categ : categList) {
              Boolean hasLink = linkMap.get(categ.getId());
              JsonElement element = createCategRefJSONObj(categ, hasLink);
              categJsonArray.add(element);
          }
  
          return categJsonArray;
      }
  
      private JsonElement createCategRefJSONObj(MCRCategory categ, Boolean hasLink) {
          JsonObject categRefJsonObject = new JsonObject();
          categRefJsonObject.add(PROP_ID, serializationContext.serialize(categ.getId()));
          SortedSet<MCRLabel> labels = categ.getLabels();
          categRefJsonObject.add(PROP_LABELS, serializationContext.serialize(new MCRLabelSetWrapper(labels)));
          URI uri = categ.getURI();
          if (uri != null) {
              categRefJsonObject.addProperty(PROP_URISTR, uri.toString());
          }
          categRefJsonObject.addProperty(PROP_HAS_CHILDREN, categ.hasChildren());
          categRefJsonObject.addProperty(PROP_HAS_LINK, hasLink);
          return categRefJsonObject;
      }
  
      @Override
      public MCRCategoryListWrapper deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
          throws JsonParseException {
          List<MCRCategory> categList = new ArrayList<>();
  
          for (JsonElement categRef : json.getAsJsonArray()) {
              JsonObject categRefJsonObject = categRef.getAsJsonObject();
  
             MCRCategory categ = context.deserialize(categRefJsonObject, MCRJSONCategory.class);
             categList.add(categ);
         }
 
         return new MCRCategoryListWrapper(categList);
     }
 }