/*
    * Copyright (c) 2002-2017, Mairie de 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.deployment.uploadhandler;
  
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Locale;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpSession;
  
  import org.apache.commons.fileupload.FileItem;
  import org.apache.commons.lang.StringUtils;
  
  import fr.paris.lutece.plugins.asynchronousupload.service.AbstractAsynchronousUploadHandler;
  import fr.paris.lutece.portal.service.i18n.I18nService;
  import fr.paris.lutece.portal.service.util.AppException;
  import fr.paris.lutece.portal.service.util.AppPropertiesService;
  import fr.paris.lutece.util.filesystem.UploadUtil;
  
  public class DeploymentUploadHandler extends AbstractAsynchronousUploadHandler
  {
      public static final String BEAN_NAME = "deployment.deploymentUploadHandler";
      private static final int DEFAULT_MAX_FILE_SIZE = 2097152;
      private static final String HANDLER_NAME = "deploymentUploadHandler";
  
      // Error messages
      private static final String ERROR_MESSAGE_MULTIPLE_UPLOAD = "deployment.upload.message.multipleUpload";
      private static final String ERROR_MESSAGE_UPLOAD_MAX_SIZE = "deployment.upload.message.uploadMaxSize";
      private static final String ERROR_MESSAGE_NOT_SQL_FILE = "deployment.upload.message.uploadNotSqlFile";
  
      // PROPERTY
      private static final String PROPERTY_UPLOAD_MAX_SIZE = "deployment.uploadMaxFileSize";
  
      /* contains uploaded file items */
      private static Map<String, Map<String, List<FileItem>>> _mapAsynchronousUpload = new ConcurrentHashMap<String, Map<String, List<FileItem>>>( );
  
      @Override
      public void addFileItemToUploadedFilesList( FileItem fileItem, String strFieldName, HttpServletRequest request )
      {
          // This is the name that will be displayed in the form. We keep
          // the original name, but clean it to make it cross-platform.
          String strFileName = UploadUtil.cleanFileName( fileItem.getName( ).trim( ) );
  
          initMap( request.getSession( ).getId( ), strFieldName );
  
          // Check if this file has not already been uploaded
          List<FileItem> uploadedFiles = getListUploadedFiles( strFieldName, request.getSession( ) );
  
          if ( uploadedFiles != null )
          {
              boolean bNew = true;
  
              if ( !uploadedFiles.isEmpty( ) )
              {
                  Iterator<FileItem> iterUploadedFiles = uploadedFiles.iterator( );
  
                  while ( bNew && iterUploadedFiles.hasNext( ) )
                  {
                      FileItem uploadedFile = iterUploadedFiles.next( );
                      String strUploadedFileName = UploadUtil.cleanFileName( uploadedFile.getName( ).trim( ) );
                      // If we find a file with the same name and the same
                      // length, we consider that the current file has
                      // already been uploaded
                      bNew = !( StringUtils.equals( strUploadedFileName, strFileName ) && ( uploadedFile.getSize( ) == fileItem.getSize( ) ) );
                 }
             }
 
             if ( bNew )
             {
                 uploadedFiles.add( fileItem );
             }
         }
     }
 
     @Override
     public String canUploadFiles( HttpServletRequest request, String strFieldName, List<FileItem> listFileItemsToUpload, Locale locale )
     {
         Long nMaxSize = AppPropertiesService.getPropertyLong( PROPERTY_UPLOAD_MAX_SIZE, DEFAULT_MAX_FILE_SIZE );
 
         // Check if this file has not already been uploaded
         List<FileItem> uploadedFiles = getListUploadedFiles( strFieldName, request.getSession( ) );
 
         if ( uploadedFiles != null && uploadedFiles.size( ) >= 1 )
         {
             return I18nService.getLocalizedString( ERROR_MESSAGE_MULTIPLE_UPLOAD, request.getLocale( ) );
         }
 
         for ( FileItem fileItem : listFileItemsToUpload )
         {
 
             if ( fileItem.getName( ) != null && !fileItem.getName( ).endsWith( ".sql" ) )
             {
                 return I18nService.getLocalizedString( ERROR_MESSAGE_NOT_SQL_FILE, request.getLocale( ) );
             }
 
             if ( fileItem.getSize( ) > nMaxSize )
             {
                 return I18nService.getLocalizedString( ERROR_MESSAGE_UPLOAD_MAX_SIZE, request.getLocale( ) );
             }
 
         }
 
         return null;
 
     }
 
     @Override
     public String getHandlerName( )
     {
         return HANDLER_NAME;
     }
 
     @Override
     public List<FileItem> getListUploadedFiles( String strFieldName, HttpSession session )
     {
         if ( StringUtils.isBlank( strFieldName ) )
         {
             throw new AppException( "id field name is not provided for the current file upload" );
         }
 
         initMap( session.getId( ), strFieldName );
 
         // find session-related files in the map
         Map<String, List<FileItem>> mapFileItemsSession = _mapAsynchronousUpload.get( session.getId( ) );
 
         return mapFileItemsSession.get( strFieldName );
     }
 
     @Override
     public void removeFileItem( String strFieldName, HttpSession session, int nIndex )
     {
         // Remove the file (this will also delete the file physically)
         List<FileItem> uploadedFiles = getListUploadedFiles( strFieldName, session );
 
         if ( ( uploadedFiles != null ) && !uploadedFiles.isEmpty( ) && ( uploadedFiles.size( ) > nIndex ) )
         {
             // Remove the object from the Hashmap
             FileItem fileItem = uploadedFiles.remove( nIndex );
             fileItem.delete( );
         }
     }
 
     /**
      * Init the map Copy paste from genericAttribute AbstractGenAttUploadHandler from
      * http://wiki.lutece.paris.fr/lutece/jsp/site/Portal.jsp?page=wiki&page_name=asynchronous_upload&view=page
      * 
      * @param strSessionId
      *            the session id
      * @param strFieldName
      *            the field name
      */
     private void initMap( String strSessionId, String strFieldName )
     {
         // find session-related files in the map
         Map<String, List<FileItem>> mapFileItemsSession = _mapAsynchronousUpload.get( strSessionId );
 
         // create map if not exists
         if ( mapFileItemsSession == null )
         {
             synchronized( this )
             {
                 // Ignore double check locking error : assignation and instanciation of objects are separated.
                 mapFileItemsSession = _mapAsynchronousUpload.get( strSessionId );
 
                 if ( mapFileItemsSession == null )
                 {
                     mapFileItemsSession = new ConcurrentHashMap<String, List<FileItem>>( );
                     _mapAsynchronousUpload.put( strSessionId, mapFileItemsSession );
                 }
             }
         }
 
         List<FileItem> listFileItems = mapFileItemsSession.get( strFieldName );
 
         if ( listFileItems == null )
         {
             listFileItems = new ArrayList<FileItem>( );
             mapFileItemsSession.put( strFieldName, listFileItems );
         }
     }
 
     /**
      * Removes all files associated to the session
      * 
      * @param strSessionId
      *            the session id
      */
     public void removeSessionFiles( String strSessionId )
     {
         _mapAsynchronousUpload.remove( strSessionId );
     }
 }