package int_2.servlets.assignments1;

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

import int_2.servlets.*;
import int_2.tools.*;

/**
Please respect the copyright of this code. It is not allowed to copy this code and use at any circumstances.
@author		<a href="mailto:fredand44@hotmail.com">&copy; Fredrik Andersson</a><br>

This servlet uses code from my home made toolbox that you can find in the folder 8/tools and 8/beans.
The toolbox is not ready yet, I have been working for it for a couple of years when I have time.
The goal is to get a toolbox of classes so it will be easier to map tasks to
use-case-diagram.

I do not use Java 1.5 since I do not have been able to download it cause I use a 56kb modem
for Internet access.
So I have done that old way as you can see.
*/
public class EnvironmentVariables_1b extends GeneralServlet
{
	public void start(HttpServletRequest request, HttpServletResponse response) throws IOException
	{
		response.setContentType("text/plain");
		out = new PrintWriter(response.getOutputStream());

		StringBuffer output = new StringBuffer(getServerSideInfo(request));
		output.append("\n\n");
		output.append( getClientSideInfo(request) );

		printString(output.toString());
		flush();
	}

	public String getServerSideInfo(HttpServletRequest request)
	{
		ServletContext sc = getServletContext();
		StringBuffer info = new StringBuffer("SERVLET INFORMATION:\n");

      	info.append("\tServlet name :");
      	info.append(getServletName());
      	info.append("\n\n");
		info.append("SERVLET INIT PARAMETERS:\n");
      	Enumeration e = getInitParameterNames();
      	while (e.hasMoreElements())
      	{
        	String key = (String)e.nextElement();
         	String value = getInitParameter(key);
         	info.append("\t");
         	info.append(key);
         	info.append(": ");
         	info.append(value);
         	info.append("\n");
      	}
		info.append("\n\n");


      	info.append("CONTEXT INIT PARAMETERS:\n");
      	e = sc.getInitParameterNames();
      	while (e.hasMoreElements())
      	{
         	String key = (String)e.nextElement();
         	String value = sc.getInitParameter(key);
         	info.append("\t");
         	info.append(key);
         	info.append(": ");
         	info.append(value);
         	info.append("\n");
      	}
		info.append("\n\n");

		info.append("SERVER INFORMATION:\n");
		info.append("\t");
		info.append("Server name: ");
		info.append(request.getServerName());
		info.append("\n");
		info.append("\t");
		info.append("Server port: ");
		info.append(request.getServerPort());
		info.append("\n");
		info.append("\t");
		info.append("Server info: ");
		info.append(sc.getServerInfo());
		info.append("\n\n\n");

      	info.append("SERVER ATTRIBUTES:\n");
      	e = sc.getAttributeNames();
      	while (e.hasMoreElements())
      	{
         	String key = (String)e.nextElement();
         	Object value = sc.getAttribute(key);
         	info.append("\t");
         	info.append(key);
         	info.append(": ");
         	info.append(value.toString());
         	info.append("\n");
      	}
		info.append("\n\n");

		info.append("RUNTIME VERSIONS:\n");
		info.append("\t");
		info.append("Major webserver version: ");
		info.append(sc.getMajorVersion());
		info.append("\n");
		info.append("\t");
		info.append("Minor webserver version: ");
		info.append(sc.getMinorVersion());
		info.append("\n");
		info.append("\t");
		info.append("JDK version: ");
		info.append(System.getProperty("java.version"));
		info.append("\n\n\n");

		return info.toString();
	}

	public String getClientSideInfo(HttpServletRequest request)
	{
		StringBuffer info = new StringBuffer("CLIENT-SIDE INFORMATION:\n");

		info.append("CLIENT INFORMATION:\n");
		info.append("\t");
		info.append("Remote address: ");
		info.append(request.getRemoteAddr());
		info.append("\n");
		info.append("\t");
		info.append("Remote host: ");
		info.append(request.getRemoteHost());
		info.append("\n");
		info.append("\t");
		info.append("Remote user: ");
		info.append(request.getRemoteUser());
		info.append("\n");
		info.append("\t");
		info.append("Authentication type: ");
		info.append(request.getAuthType());
		info.append("\n\n");

		info.append("HEADERS:\n");
		Enumeration e = request.getHeaderNames();
		while (e.hasMoreElements())
		{
         	String key = (String)e.nextElement();
         	String value = request.getHeader(key);
         	info.append("\t");
         	info.append(key);
         	info.append(": ");
         	info.append(value);
         	info.append("\n");
      	}
      	info.append("\n\n");

      	info.append("REQUEST PARAMETERS:\n");
		info.append("\t");
      	info.append("Query string: ");
      	info.append(request.getQueryString());
      	info.append("\n");
		info.append("\t");
      	info.append("Character encoding: ");
      	info.append(request.getCharacterEncoding()); // Test
      	info.append("\n");
		info.append("\t");
      	info.append("Content length: ");
      	info.append(request.getContentLength()); // Test
      	info.append("\n");
		info.append("\t");
      	info.append("Content type: ");
      	info.append(request.getContentType()); // Test
      	info.append("\n\n");

      	info.append("REQUEST PARAMETERS, ONE BY ONE:\n");
      	e = request.getParameterNames();
      	while (e.hasMoreElements())
      	{
         	String key = (String)e.nextElement();
         	String[] values = request.getParameterValues(key);
         	for(int i = 0; i < values.length; i++)
         	{
         		info.append("\t");
         		info.append(key);
         		info.append(": ");
         		info.append(values[i]);
         		info.append("\n");
			}
        }
        info.append("\n\n");

      	info.append("COOKIES, ONE BY ONE:\n");
      	Cookie[] cookies = request.getCookies();
      	if(cookies != null)
      	{
			for (int i = 0; i < cookies.length; i++)
			{
				Cookie cookie = cookies[i];
				info.append("\t");
				info.append(cookie.getName());
				info.append(": ");
				info.append(cookie.getValue());
				info.append("\n");
			}
      	}
      	info.append("\n\n");

		info.append("PATH AND CONNECTION INFORMATION:\n");
		info.append("\t");
		info.append("Path info: ");
		info.append(request.getPathInfo());
		info.append("\n");
		info.append("\t");
		info.append("Translated path: ");
		info.append(request.getPathTranslated());
		info.append("\n");
		info.append("\t");
		info.append("Request URI: ");
		info.append(request.getRequestURI());
		info.append("\n");
		info.append("\t");
		info.append("Request URL: ");
		info.append(request.getRequestURL().toString());
		info.append("\n");
		info.append("\t");
		info.append("Request scheme: ");
		info.append(request.getScheme());
		info.append("\n");
		info.append("\t");
		info.append("Context path: ");
		info.append(request.getContextPath());
		info.append("\n");
		info.append("\t");
		info.append("Servlet path: ");
		info.append(request.getServletPath());
		info.append("\n");
		info.append("\t");
		info.append("Request protocol: ");
		info.append(request.getProtocol());
		info.append("\n");
		info.append("\t");
		info.append("Request method: ");
		info.append(request.getMethod());
		info.append("\n\n");

		info.append("REQUEST ATTRIBUTES:\n");
		e = request.getAttributeNames();
		while (e.hasMoreElements())
		{
			String key = (String)e.nextElement();
			Object value = request.getAttribute(key);
			info.append("\t");
			info.append(key);
			info.append(": ");
			info.append(value.toString());
			info.append("\n");
		}
		info.append("\n\n");

		info.append("SESSION INFORMATION:\n");
		info.append("\t");
		info.append("Requested session ID: ");
		info.append(request.getRequestedSessionId());
		info.append("\n");
		info.append("\t");
		HttpSession session = request.getSession(true);
		info.append("Session creation time: ");
		info.append(session.getCreationTime());
		info.append("\n");
		info.append("\t");
		info.append("Session ID: ");
		info.append(session.getId());
		info.append("\n");
		info.append("\t");
		info.append("Session last accessed: ");
		info.append(session.getLastAccessedTime());
		info.append("\n");
		info.append("\t");
		info.append("Session max inactive interval: ");
		info.append(session.getMaxInactiveInterval());
		info.append("\n\n");

      	info.append("SESSION VALUES:\n");
      	e = session.getAttributeNames();
      	while (e.hasMoreElements())
      	{
        	String key = (String)e.nextElement();
         	Object value = request.getAttribute(key);
			info.append("\t");
			info.append(key);
			info.append(": ");
			info.append(value.toString());
			info.append("\n");
      	}

      	return info.toString();
	}
}