/*
    * Copyright (c) 2002-2022, 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.genericattributes.service.anonymization;
  
  import java.io.IOException;
  import java.nio.file.Path;
  import java.nio.file.Paths;
  
  import org.apache.commons.io.FileUtils;
  import org.apache.commons.io.FilenameUtils;
  
  import fr.paris.lutece.plugins.genericattributes.business.Entry;
  import fr.paris.lutece.plugins.genericattributes.business.Response;
  import fr.paris.lutece.plugins.genericattributes.service.file.GenericAttributeFileService;
  import fr.paris.lutece.portal.business.file.File;
  import fr.paris.lutece.portal.business.file.FileHome;
  import fr.paris.lutece.portal.service.util.AppLogService;
  import fr.paris.lutece.portal.service.util.AppPathService;
  
  /**
   * {@link IEntryTypeAnonymisationService} that replace the file with an empty file.
   */
  public class FileReplaceAnonymizationService extends AbstractAnonymizationService
  {
  
      private static final String FILES_DIRECTORY = "/WEB-INF/anonymization/";
  
      @Override
      public void anonymizeResponse( Entry entry, Response response, boolean first )
      {
          if ( isAnonymizable( entry ) )
          {
              String pattern = getPattern( entry );
              if ( pattern.contains( _wildcard ) && response.getFile( ) != null )
              {
                  File responseFile = GenericAttributeFileService.getInstance().load( response.getFile( ).getFileKey( ) );
              	
                  if ( responseFile != null )
                  {
              	    String fileType = FilenameUtils.getExtension( responseFile.getTitle( ) );
  
                      try
                      {
                          java.io.File emptyFile = getEmptyFile( "empty." + fileType );
                          responseFile.setTitle( emptyFile.getName( ) );
                          responseFile.setSize( (int) emptyFile.length( ) );
                          responseFile.getPhysicalFile( ).setValue( FileUtils.readFileToByteArray( emptyFile ) );
                          response.setFile( responseFile );
                      }
                      catch( IOException e )
                      {
                          AppLogService.error( "Error while replacing file", e );
                          GenericAttributeFileService.getInstance().delete( response.getFile( ).getFileKey( ) );
                          response.setFile( null );
                      }
              	}
              	else
              	{
              	    response.setFile( null );
              	}
              }
          }
      }
  
      private java.io.File getEmptyFile( String filename )
      {
          Path path = Paths.get( AppPathService.getWebAppPath( ), FILES_DIRECTORY, filename );
  
         if ( !path.toFile( ).exists( ) )
         {
             path = Paths.get( AppPathService.getWebAppPath( ), FILES_DIRECTORY, "empty.txt" );
         }
         return path.toFile( );
     }
 }