/*
    * Copyright (c) 2002-2014, 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.portal.web.upload;
  
  import fr.paris.lutece.portal.service.spring.SpringContextService;
  import fr.paris.lutece.portal.service.util.AppLogService;
  
  import net.sf.json.JSONArray;
  import net.sf.json.JSONObject;
  
  import org.apache.commons.fileupload.FileItem;
  
  import java.io.IOException;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map.Entry;
  
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServlet;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  
  /**
   * Handles asynchronous uploads.
   */
  public class UploadServlet extends HttpServlet
  {
      private static final long serialVersionUID = 1L;
      private static final String JSON_FILE_SIZE = "fileSize";
      private static final String JSON_FILE_NAME = "fileName";
      private static final String JSON_FILES = "files";
      private static final String JSON_UTF8_CONTENT_TYPE = "application/json; charset=UTF-8";
  
      /**
       * {@inheritDoc}
       */
      @Override
      protected void doPost( HttpServletRequest req, HttpServletResponse response )
          throws ServletException, IOException
      {
          MultipartHttpServletRequest request = (MultipartHttpServletRequest) req;
  
          List<FileItem> listFileItems = new ArrayList<FileItem>(  );
          JSONObject json = new JSONObject(  );
          json.element( JSON_FILES, new JSONArray(  ) );
  
          for ( Entry<String, List<FileItem>> entry : ( request.getFileListMap(  ) ).entrySet(  ) )
          {
              for ( FileItem fileItem : entry.getValue(  ) )
              {
                  JSONObject jsonFile = new JSONObject(  );
                  jsonFile.element( JSON_FILE_NAME, fileItem.getName(  ) );
                  jsonFile.element( JSON_FILE_SIZE, fileItem.getSize(  ) );
  
                  // add to existing array
                  json.accumulate( JSON_FILES, jsonFile );
  
                  listFileItems.add( fileItem );
              }
          }
  
          IAsynchronousUploadHandler handler = getHandler( request );
  
          if ( handler == null )
          {
              AppLogService.error( "No handler found, removing temporary files" );
 
             for ( FileItem fileItem : listFileItems )
             {
                 fileItem.delete(  );
             }
         }
         else
         {
             handler.process( request, response, json, listFileItems );
         }
 
         if ( AppLogService.isDebugEnabled(  ) )
         {
             AppLogService.debug( "Aysnchronous upload : " + json.toString(  ) );
         }
 
         response.setContentType(JSON_UTF8_CONTENT_TYPE);
         response.getWriter().print( json.toString(  ) );
     }
 
     /**
      * Gets the handler
      * @param request the reques
      * @return the handler found, <code>null</code> otherwise.
      * @see IAsynchronousUploadHandler#isInvoked(HttpServletRequest)
      */
     private IAsynchronousUploadHandler getHandler( HttpServletRequest request )
     {
         for ( IAsynchronousUploadHandler handler : SpringContextService.getBeansOfType( 
                 IAsynchronousUploadHandler.class ) )
         {
             if ( handler.isInvoked( request ) )
             {
                 return handler;
             }
         }
 
         return null;
     }
 }