/**
 * <copyright> Copyright (c) 2006 by Know-Center, Graz, Austria </copyright>
 * 
 * This software is the confidential and proprietary information of Know-Center,
 * Graz, Austria. You shall not disclose such Confidential Information and shall
 * use it only in accordance with the terms of the license agreement you entered
 * into with Know-Center.
 * 
 * KNOW-CENTER MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
 * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
 * NON-INFRINGEMENT. KNOW-CENTER SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY
 * LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES.
 * 
 * $Id: AsynchronousDataResponder.java,v 1.3 2006/08/30 14:02:35 wprinz Exp $
 */
package at.knowcenter.wag.egov.egiz.web;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.log4j.Logger;

import at.knowcenter.wag.egov.egiz.cfg.ConfigLogger;
import at.knowcenter.wag.egov.egiz.cfg.SettingsReader;

/**
 * Servlet that responds to the data post requests of the local service (e.g.
 * BKU).
 * 
 * @author wprinz
 */
public class AsynchronousDataResponder extends HttpServlet
{

  /**
   * SVUID.
   */
  private static final long serialVersionUID = -4992297156381763174L;

  /**
   * The logger definition.
   */
  private static final Logger logger_ = ConfigLogger.getLogger(AsynchronousDataResponder.class);

  protected void doGet(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException
  {
    logger_.debug("AsyncDataResp GET REQUEST.");
    super.doGet(arg0, arg1);
  }

  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
  {
    logger_.debug("AsyncDataResp !!!!!!!!!!!!!!!!!!!!!!");

    HttpSession session = request.getSession(false);
    if (session == null)
    {
      throw new ServletException("There is no session associated with this request.");
    }

    // String session_id_string = request.getParameter("session");
    // if (session_id_string == null)
    // {
    // throw new ServletException("The session parameter is missing.");
    // }

    SessionInformation si = (SessionInformation) session.getAttribute(SessionAttributes.ATTRIBUTE_SESSION_INFORMATION);
    // long session_id = Long.parseLong(session_id_string);
    // SessionInformation si = SessionTable.get(session_id);
    if (si == null)
    {
      throw new ServletException("The session is not found or no longer valid.");
    }

    // InputStream is = request.getInputStream();
    // byte [] data = new byte[request.getContentLength()];
    // is.read(data);
    // is.close();
    // String enc = request.getCharacterEncoding();
    // String ct = request.getContentType();
    // Enumeration enum = request.getHeaderNames();
    //    
    // String dat = new String(data, "US-ASCII");
    // // dat looks like: XMLResponse=blablabla ...
    // // so the actual XMLResponse begins after the =
    // String resp = URLDecoder.decode(dat, "UTF-8");

    logger_.debug("Answer from local service: content-type = '" + request.getContentType() + "', character encoding = '" + request.getCharacterEncoding() + "'");

    // .getParameter will use the character encoding specified by the
    // content-type header.
    // Unfortunately BKU forgets to specify a chatacter encoding.
    // Therefor, .getParameter will assume US-ASCII or something.
    // ==> we explicitely set UTF-8
    if (request.getCharacterEncoding() == null)
    {
      request.setCharacterEncoding("UTF-8");
      logger_.debug("  no character encoding specified - set to UTF-8");
    }

    logger_.debug("AsyncDataResponder: si.current_operation = " + si.current_operation);

    String resp_string = request.getParameter("XMLResponse");
    if (resp_string == null)
    {
      logger_.debug("response String is null => trying multipart form");

      DiskFileItemFactory fif = new DiskFileItemFactory();
      fif.setRepository(SettingsReader.getTemporaryDirectory());
      ServletFileUpload sfu = new ServletFileUpload(fif);

      try
      {
        List items = sfu.parseRequest(request);
        
        for (int i = 0; i < items.size(); i++)
        {
          FileItem item = (FileItem) items.get(i);
          logger_.debug("item = " + item.getFieldName());
          
          if (item.getFieldName().equals("XMLResponse"))
          {
            resp_string = item.getString("UTF-8");
          }
        }
      }
      catch (FileUploadException e)
      {
        throw new ServletException("File Upload exception. cannot parse POST data");
      }

    }

    si.response_string[si.current_operation] = resp_string; //request.getParameter("XMLResponse");
    //logger_.debug("AsyncDataResponder: si.response_string[si.current_operation] = " + si.response_string[si.current_operation]);

    si.current_operation++;

    si.finished = true;

    LocalRequestHelper.formatBKUOkResponse(response);
  }
}