package forms;

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

import org.apache.ecs.*;
import org.apache.ecs.html.*;

import java.util.zip.*;

/** 
 * A servlet to demonstrate how to compressed data sent to the client
 * It also uses ECS to format the results.
 * A compressed version of Parameters3
 *
 * @version 1.0 2001/08/15 
 * @since 1.0
 * @author Mike Gehard
 */


public class CompressedReg extends HttpServlet{
	
	// used so we can tell client how long the response is
	private ByteArrayOutputStream byteStream = new ByteArrayOutputStream(1024);
	private String compressionType;
	

	public void doPost(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException{
		
		// determine what type of encoding we are going to use
		OutputStream compressStream = getCompressionStream(request, response);
		
		response.setContentType("text/html"); 
		
		// you will write to the compression stream, not the response stream
  		PrintWriter out = new PrintWriter(compressStream); 
  		  		
		out.println(createPage(request));
		out.close();
		
		// tell the client how much data they are getting
		response.setContentLength(byteStream.size());
		// actually write the data to the client
		byteStream.writeTo(response.getOutputStream());
		
	}
	
	public void doGet(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException{
		// forward to doPost()
		doPost(request, response);		
	}
	
	private String createPage(HttpServletRequest request){
		
  		Table table = new Table(0); // border = 0
  		
  		// create the HTML tree
  		Html html = new Html();
  		Head head = new Head();
  		Title title = new Title("Registration");
  		Body body = new Body();
  		
  		head.addElement(title);
  		body.addElement(table);
  		html.addElement(head);
  		html.addElement(body);
  		
  		body.addElement(new H1("Thank you!  Your registration is confirmed."));
  		
  		body.addElement(request.getParameter("salutation") + " " + 
  						request.getParameter("lastName") + " " + 
  						request.getParameter("firstName"));
  						
  		body.addElement(new BR());
  		
  		body.addElement(request.getParameter("company"));
  		
  		body.addElement(new BR());
  		
  		body.addElement("Email: " + request.getParameter("email"));
  		
  		body.addElement(new BR());
  		
  		body.addElement("Primary area of business: " + request.getParameter("business"));
  		
  		body.addElement(new BR());
  		
  		body.addElement("Interest areas");
  		
      	String values[] = request.getParameterValues("interests");
      	//System.out.println("values[] length = " + values.length);
      	if (values != null) { 
      		UL list = new UL();
			for (int i = 0; i < values.length; i++) { 
				list.addElement(new LI(values[i]));
			}
			body.addElement(list);
      	}
      	
      	body.addElement("Comments: " + request.getParameter("comments"));
      	
      	body.addElement(new HR());
      	body.addElement(compressionType);
      	
      	
    	return html.toString();
		
		
	}
	
	private OutputStream getCompressionStream(HttpServletRequest request,
		 HttpServletResponse response) throws IOException{
		 	
		 // the default value for the return
		 OutputStream retVal = byteStream;
		 compressionType = "No Compression";
		 
		 	
		 String encodings = request.getHeader("Accept-Encoding");
		 
		 if (encodings != null && encodings.indexOf("gzip") >= 0){
		 	// tell client they are getting gzip
		 	response.setHeader("Content-Encoding", "gzip");
		 	retVal = new GZIPOutputStream(byteStream);
		 	compressionType = "GZip Compressed";
		 } else if (encodings != null && encodings.indexOf("compress") >= 0){
		 	// tell client they are getting compress
		 	response.setHeader("Content-Encoding", "compress");
		 	retVal = new ZipOutputStream(byteStream);
		 	compressionType = "Zip Compressed";			 	
		 }
		 
		 return retVal;
	}	

}