/*
    * Copyright (c) 2002-2020, City of Paris
    * All rights reserved.
    *
    * Redistribution and use in source and binary forms, with or without
    * modification, are permitted provided that the following conditions
    * are met:
    *
    *  1. Redistributions of source code must retain the above copyright notice
   *     and the following disclaimer.
   *
   *  2. Redistributions in binary form must reproduce the above copyright notice
   *     and the following disclaimer in the documentation and/or other materials
   *     provided with the distribution.
   *
   *  3. Neither the name of 'Mairie de Paris' nor 'Lutece' nor the names of its
   *     contributors may be used to endorse or promote products derived from
   *     this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   * License 1.0
   */
  package fr.paris.lutece.plugins.mylutece.modules.users.service.search;
  
  import fr.paris.lutece.portal.service.search.IndexationService;
  import fr.paris.lutece.portal.service.search.LuceneSearchEngine;
  import fr.paris.lutece.portal.service.search.SearchItem;
  import fr.paris.lutece.portal.service.util.AppLogService;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import javax.servlet.http.HttpServletRequest;
  import org.apache.lucene.document.Document;
  import org.apache.lucene.index.DirectoryReader;
  import org.apache.lucene.index.IndexReader;
  import org.apache.lucene.index.IndexableField;
  import org.apache.lucene.queryparser.classic.QueryParser;
  import org.apache.lucene.search.BooleanClause;
  import org.apache.lucene.search.BooleanQuery;
  import org.apache.lucene.search.IndexSearcher;
  import org.apache.lucene.search.ScoreDoc;
  import org.apache.lucene.search.TopDocs;
  import org.apache.lucene.store.Directory;
  
  /**
   * 
   * LocalUserSearchEngine
   * 
   */
  public class LocalUserSearchEngine
  {
      /**
       * Return search results
       * 
       * @param strKeywords
       *            Keywords
       * @param request
       *            The HTTP request
       * @return Results as a collection of SearchResult
       */
      public static List<Map<String, String>> getSearchResults( String strKeywords, HttpServletRequest request )
      {
          List<Map<String, String>> listResults = new ArrayList<>( );
          IndexSearcher searcher = null;
          try ( Directory directory = IndexationService.getDirectoryIndex( ) ; IndexReader ir = DirectoryReader.open( directory ) )
          {
              searcher = new IndexSearcher( ir );
              BooleanQuery.Builder queryBuilder = new BooleanQuery.Builder( );
  
              if ( ( strKeywords != null ) && !strKeywords.equals( "" ) )
              {
                  QueryParser parser = new QueryParser( SearchItem.FIELD_CONTENTS, IndexationService.getAnalyser( ) );
                  queryBuilder.add( parser.parse( strKeywords ), BooleanClause.Occur.MUST );
              }
  
              TopDocs topDocs = searcher.search( queryBuilder.build( ), LuceneSearchEngine.MAX_RESPONSES );
              ScoreDoc [ ] hits = topDocs.scoreDocs;
              for ( int i = 0; i < hits.length; i++ )
              {
                  int docId = hits [i].doc;
                  Document document = searcher.doc( docId );
                  Map<String, String> listUserResults = new HashMap<>( );
                  for ( IndexableField field : document.getFields( ) )
                  {
  
                      listUserResults.put( field.name( ), field.stringValue( ) );
 
                 }
                 listResults.add( listUserResults );
             }
         }
         catch( Exception e )
         {
             AppLogService.error( e.getMessage( ), e );
         }
         return listResults;
     }
 
 }