/**
 * <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: AsynchronousRedirectResponder.java,v 1.4 2006/10/11 07:39:13 wprinz Exp $
 */
package at.knowcenter.wag.egov.egiz.web;

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

import javax.servlet.RequestDispatcher;
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.log4j.Logger;

import at.knowcenter.wag.egov.egiz.PdfASID;
import at.knowcenter.wag.egov.egiz.cfg.ConfigLogger;
import at.knowcenter.wag.egov.egiz.exceptions.ErrorCodeException;
import at.knowcenter.wag.egov.egiz.exceptions.PresentableException;
import at.knowcenter.wag.egov.egiz.framework.Signator;
import at.knowcenter.wag.egov.egiz.framework.SignatorFactory;
import at.knowcenter.wag.egov.egiz.sig.ConnectorFactory;
import at.knowcenter.wag.egov.egiz.sig.SignatureResponse;
import at.knowcenter.wag.egov.egiz.sig.connectors.BKUConnector;

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

  /**
   * SVUID.
   */
  private static final long serialVersionUID = -682360466333727236L;

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

  protected void dispatch(HttpServletRequest request,
      HttpServletResponse response, String resource) throws ServletException, IOException
  {
    response.setContentType("text/html");
    response.setCharacterEncoding("UTF-8");

    RequestDispatcher disp = getServletContext().getRequestDispatcher(resource);
    disp.forward(request, response);
  }

  protected void dispatchToResults(List results, HttpServletRequest request,
      HttpServletResponse response) throws ServletException, IOException
  {
    request.setAttribute("results", results);
    dispatch(request, response, "/jsp/results.jsp");
  }
  
  protected void dispatchToRedirectRefreshPage (HttpServletRequest request,
      HttpServletResponse response, String refresh_url) throws ServletException, IOException
  {
    request.setAttribute("refresh_url", refresh_url);
    dispatch(request, response, LocalRequestHelper.REDIRECT_REFRESH_PAGE_JSP);
  }

  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
  {
    logger_.debug("AsyncRedirResp");
    
    SessionInformation si = null;
    
    HttpSession session = null;
    try
    {
      session = request.getSession(false);
      //String session_id_string = request.getParameter("session");
      if (session == null)
      {
        throw new ErrorCodeException(600, "The session is missing.");
      }

      si = (SessionInformation) session.getAttribute(SessionAttributes.ATTRIBUTE_SESSION_INFORMATION);
//      long session_id = Long.parseLong(session_id_string);
//      si = SessionTable.get(session_id);
      if (si == null)
      {
        throw new ErrorCodeException(600, "The session is not found or is no longer valid.");
      }

    }
    catch (PresentableException e)
    {
      e.printStackTrace();
      Sign.prepareDispatchToErrorPage(e, request);
      dispatch(request, response, "/jsp/error.jsp");
      
      return;
    }

    try
    {
      if (si.finished == false)
      {
        String url = request.getRequestURL().toString();
        logger_.debug("RequestURL = " + url);
        String refresh_url = response.encodeURL(url);
        logger_.debug("RefreshURL = " + refresh_url);
        dispatchToRedirectRefreshPage(request, response, refresh_url);
        return;
      }

      si.finished = false;

      if (si.current_operation < si.requests.length)
      {
        LocalRequestHelper.prepareDispatchToLocalConnectionPage(si.requests[si.current_operation], request, response);
        dispatch(request, response, LocalRequestHelper.LOCAL_CONNECTION_PAGE_JSP);
        return;
      }

      // all requests have been carried out.
      //session.removeAttribute(SessionAttributes.ATTRIBUTE_SESSION_INFORMATION);
      //SessionTable.remove(si.session_id);

      BKUConnector local_conn = (BKUConnector) ConnectorFactory.createConnector(si.connector);

      if (si.application.equals("verify"))
      {
        List results = new ArrayList();

        for (int i = 0; i < si.response_string.length; i++)
        {
          SignatureResponse sig_resp = local_conn.analyzeVerifyResponse(si.response_string[i]);
          results.add(sig_resp);
        }

        dispatchToResults(results, request, response);
      }
      else
      {
        //logger_.debug("AsyncRedirResponder: si.response_string[0] = " + si.response_string[0]);
        logger_.debug("AsyncRedirResponder: si.current_op = " + si.current_operation);

        if (si.response_string[0] == null)
        {
          String url = request.getRequestURL().toString();
          logger_.debug("RequestURL = " + url);
          String refresh_url = response.encodeURL(url);
          logger_.debug("RefreshURL = " + refresh_url);
          dispatchToRedirectRefreshPage(request, response, refresh_url);
          return ;
        }
        
        si.iui.signed_signature_object = local_conn.analyzeSignResponse(si.response_string[0], si.type);
        
        PdfASID algorithm = FormFields.translateSignatureModeToPdfASID(si.mode);
        Signator signator = SignatorFactory.createSignator(algorithm);

        si.sign_result = signator.finishSign(si.iui);

        Sign.returnSignResponse(si, response);
      }

    }
    catch (PresentableException e)
    {
      session.removeAttribute(SessionAttributes.ATTRIBUTE_SESSION_INFORMATION);
      //SessionTable.remove(si.session_id);

      e.printStackTrace();
      Sign.prepareDispatchToErrorPage(e, request);
      dispatch(request, response, "/jsp/error.jsp");
    }

  }
}