/*
    WebBox - Dein Server.
    Copyright (C) 2017 Ulrich Hilger, http://uhilger.de

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as
    published by the Free Software Foundation, either version 3 of the
    License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package de.uhilger.wbx.web;

import java.awt.Image;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.catalina.servlets.DefaultServlet;

/**
 * Mit dem TNServlet kann f&uuml;r eine Bilddatei eine 
 * Miniaturansicht erzeugt werden, wie sie im Dateimanager 
 * der WebBox verwendet wird.
 * 
 */
public class TNServlet extends DefaultServlet {
  
  private static final Logger logger = Logger.getLogger(TNServlet.class.getName());
  
  /**
   * Diese String-Konstanten noetigenfalls in eine 
   * Konfigurationsdatei auslagern
   */
  public static final String TN = "_tn";
  public static final String JPG = ".jpg";
  public static final String JPEG = ".jpeg";
  public static final String PNG = ".png";
  
  /**
   * Handles the HTTP <code>GET</code> method.
   *
   * @param request servlet request
   * @param response servlet response
   * @throws ServletException if a servlet-specific error occurs
   * @throws IOException if an I/O error occurs
   */
  @Override
  protected void doGet(HttpServletRequest request, HttpServletResponse response)
          throws ServletException, IOException {
    
    String uriStr = request.getRequestURI();
    File imgfile = new File(uriStr);
    
    logger.fine("realpath of /: " + request.getServletContext().getRealPath("/"));
    
    logger.fine("imgfile: " + imgfile.getAbsolutePath());
    
    if(uriStr.contains(TN) && (uriStr.endsWith(JPG) || uriStr.endsWith(JPEG) || uriStr.endsWith(PNG))) {
      /*
      TODO: hier mit Hilfe der Klasse Bild eine Miniaturansicht erzeugen  
      und in die Antwort schreiben
      */      
      //writeImageStream(Image image, int gr, String mimeType, response.getOutputStream());
    } else {
      super.doGet(request, response);
    }
            
    
  }
  
}