/*
    * 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.search;
  
  import java.io.IOException;
  import java.text.MessageFormat;
  import java.util.Locale;
  
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  import org.apache.solr.client.solrj.SolrQuery;
  import org.apache.solr.client.solrj.SolrServerException;
  import org.apache.solr.client.solrj.response.QueryResponse;
  import org.mycore.frontend.servlets.MCRClassificationBrowser2.MCRQueryAdapter;
  import org.mycore.frontend.servlets.MCRServlet;
  import org.mycore.solr.MCRSolrClientFactory;
  import org.mycore.solr.MCRSolrConstants;
  
  import jakarta.servlet.http.HttpServletRequest;
  
  public class MCRSolrQueryAdapter implements MCRQueryAdapter {
      private static final Logger LOGGER = LogManager.getLogger(MCRSolrQueryAdapter.class);
  
      private String fieldName;
  
      private String restriction = "";
  
      private String objectType = "";
  
      private String category;
  
      private boolean filterCategory;
  
      private SolrQuery solrQuery;
  
      public void filterCategory(boolean filter) {
          this.filterCategory = filter;
      }
  
      @Override
      public void setRestriction(String text) {
          this.restriction = " " + text;
      }
  
      @Override
      public void setObjectType(String text) {
          this.objectType = " +objectType:" + text;
      }
  
      @Override
      public String getObjectType() {
          return this.objectType.isEmpty() ? null : this.objectType.split(":")[1];
      }
  
      @Override
      public void setCategory(String text) {
          this.category = text;
      }
  
      @Override
      public long getResultCount() {
          configureSolrQuery();
          LOGGER.debug("query: {}", solrQuery);
          solrQuery.set("rows", 0);
          QueryResponse queryResponse;
          try {
              queryResponse = MCRSolrClientFactory.getMainSolrClient().query(solrQuery);
          } catch (SolrServerException | IOException e) {
              LOGGER.warn("Could not query SOLR.", e);
              return -1;
          }
          return queryResponse.getResults().getNumFound();
      }
  
      @Override
      public String getQueryAsString() {
          configureSolrQuery();
          String queryString = solrQuery.toQueryString();
          return queryString.isEmpty() ? "" : queryString.substring("?".length());
      }
  
      public void prepareQuery() {
          this.solrQuery = new SolrQuery();
     }
 
     private void configureSolrQuery() {
         this.solrQuery.clear();
         String queryString = filterCategory
             ? new MessageFormat("{0}{1}", Locale.ROOT).format(new Object[] { objectType, restriction })
             : new MessageFormat("+{0}:\"{1}\"{2}{3}", Locale.ROOT)
                 .format(new Object[] { fieldName, category, objectType, restriction });
         this.solrQuery.setQuery(queryString.trim());
         if (filterCategory) {
             solrQuery.setFilterQueries(new MessageFormat("{0}+{1}:\"{2}\"", Locale.ROOT)
                 .format(new Object[] { MCRSolrConstants.SOLR_JOIN_PATTERN, fieldName, category }));
         }
     }
 
     @Override
     public void setFieldName(String fieldname) {
         this.fieldName = fieldname;
     }
 
     @Override
     public void configure(HttpServletRequest request) {
         String objectType = request.getParameter("objecttype");
         if ((objectType != null) && (objectType.trim().length() > 0)) {
             setObjectType(objectType);
         }
         String restriction = request.getParameter("restriction");
         if ((restriction != null) && (restriction.trim().length() > 0)) {
             setRestriction(restriction);
         }
         boolean filter = "true".equals(MCRServlet.getProperty(request, "filterCategory"));
         filterCategory(filter);
         prepareQuery();
     }
 }