/*
    * 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.service.image;
  
  import fr.paris.lutece.portal.service.util.AppLogService;
  import fr.paris.lutece.portal.service.util.AppPathService;
  import fr.paris.lutece.portal.service.util.AppPropertiesService;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.io.OutputStream;
  
  import javax.servlet.ServletContext;
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServlet;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  
  /**
   * Servlet serving document file resources
   */
  public class ImageServlet extends HttpServlet
  {
      private static final long serialVersionUID = -5713203328367191908L;
      private static final String PARAMETER_RESOURCE_TYPE = "resource_type";
      private static final String PARAMETER_ID = "id";
      private static final String PROPERTY_PATH_IMAGES = "path.images.root";
      private static final String PROPERTY_IMAGE_PAGE_DEFAULT = "image.page.default";
  
      /**
       * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
       * methods.
       * @param request servlet request
       * @param response servlet response
       * @throws ServletException the servlet Exception
       * @throws IOException the io exception
       */
      protected void processRequest( HttpServletRequest request, HttpServletResponse response )
          throws ServletException, IOException
      {
          String strResourceId = request.getParameter( PARAMETER_ID );
          String strResourceTypeId = request.getParameter( PARAMETER_RESOURCE_TYPE );
  
          ImageResource image;
  
          if ( strResourceId != null )
          {
              int nResourceId = Integer.parseInt( strResourceId );
              image = ImageResourceManager.getImageResource( strResourceTypeId, nResourceId );
  
              // Test the field image value
              if ( getImageExist( image ) )
              {
                  response.setContentType( image.getMimeType(  ) );
  
                  OutputStream out = response.getOutputStream(  );
                  out.write( image.getImage(  ) );
                  out.flush(  );
                  out.close(  );
              }
              else
              {
                  ServletContext sc = getServletContext(  );
                  String strImageUrl = AppPathService.getAbsolutePathFromRelativePath( AppPropertiesService.getProperty( 
                              PROPERTY_PATH_IMAGES ) + "/" +
                          AppPropertiesService.getProperty( PROPERTY_IMAGE_PAGE_DEFAULT ) ); //
                 response.setContentType( sc.getMimeType( strImageUrl ) );
 
                 File file = new File( strImageUrl );
                 response.setContentLength( (int) file.length(  ) );
 
                 FileInputStream in = null;
 
                 try
                 {
                     //Open the file and output streams
                     in = new FileInputStream( file );
 
                     OutputStream out = response.getOutputStream(  );
 
                     // Copy the contents of the file to the output stream
                     byte[] buf = new byte[1024];
                     int count = 0;
 
                     while ( ( count = in.read( buf ) ) >= 0 )
                     {
                         out.write( buf, 0, count );
                     }
 
                     in.close(  );
                     out.close(  );
                 }
                 catch ( IOException e )
                 {
                     AppLogService.error( e.getMessage(  ), e );
                     throw e;
                 }
                 finally
                 {
                     if ( in != null )
                     {
                         in.close(  );
                     }
                 }
             }
         }
     }
 
     /**
      * Handles the HTTP <code>GET</code> method.
      * @param request servlet request
      * @param response servlet response
      * @throws ServletException the servlet Exception
      * @throws IOException the io exception
      */
     @Override
     protected void doGet( HttpServletRequest request, HttpServletResponse response )
         throws ServletException, IOException
     {
         processRequest( request, response );
     }
 
     /**
      * Handles the HTTP <code>POST</code> method.
      * @param request servlet request
      * @param response servlet response
      * @throws ServletException the servlet Exception
      * @throws IOException the io exception
      */
     @Override
     protected void doPost( HttpServletRequest request, HttpServletResponse response )
         throws ServletException, IOException
     {
         processRequest( request, response );
     }
 
     /**
      * Returns a short description of the servlet.
      * @return message
      */
     @Override
     public String getServletInfo(  )
     {
         return "Servlet serving images content";
     }
 
     /**
      * Test the existence of an image in the base.
      * If the size of the contents of the field is null or lower or
      * equal 1, nImageLength is with false, otherwise it's true
      * @param image The Resource Image
      * @return true if images exist, otherwise return false
      */
     private boolean getImageExist( ImageResource image )
     {
         if ( image.getImage(  ) != null )
         {
             int nImageLength = image.getImage(  ).length;
 
             if ( nImageLength >= 1 )
             {
                 return true;
             }
         }
 
         return false;
     }
 }