package at.knowcenter.wag.egov.egiz.web.servlets;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import at.knowcenter.wag.egov.egiz.web.FormFields;
import at.knowcenter.wag.egov.egiz.web.PDFContainer;

public class ProvidePDFServlet extends HttpServlet {

  /**
   * SVUID.
   */
  private static final long serialVersionUID = 1L; 
  
  /**
   * The log.
   */
  private static Log log = LogFactory.getLog(ProvidePDFServlet.class);
  
  public static Set signedDocuments = Collections.synchronizedSet(new HashSet());
  
  public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
  {
    
    long pdfId = Long.parseLong(request.getParameter(FormFields.FIELD_PDF_ID));
    
    Iterator it = signedDocuments.iterator();
    
    while(it.hasNext()) {
      PDFContainer current = (PDFContainer) it.next();
      if(current.id == pdfId) {  
        try {
          byte[] pdf = current.pdf;

          response.setContentType("application/pdf");
          response.setContentLength(pdf.length);

          InputStream is = new ByteArrayInputStream(pdf);
          final int bufferSize = 1024;
          byte[] buffer = new byte[bufferSize];
          int len = -1;
          while ((len = is.read(buffer)) != -1) {
              response.getOutputStream().write(buffer, 0, len);
          }
          response.getOutputStream().flush();
          signedDocuments.remove(current);
        } catch(IOException e) {
          log.warn("IO excepton while providing pdf document: " + e.getMessage());
        }
      }
    }
  }
  
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
  {
    doPost(request, response);
  }
  
}