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

/**
 * The Input servlet, queries the user for preferences and starts up the process by
 * which the student's transcript is retrieved from Banner.
 */
public class Input extends HttpServlet
{
	private static final String PAGE_TITLE = "Input Page";

	public void doGet(HttpServletRequest req, HttpServletResponse rsp)
	{
		PrintWriter out = null;

		try
		{
			rsp.setContentType("text/html");
			out = rsp.getWriter();

			HttpSession session = req.getSession(false);

			if(session == null)
			{
				HTMLUtils.printRedirectPage(out,					
					"You must login to the system prior to viewing this page.",
					"Login");

				return;
			}

			TranscriptRequest transReq = (TranscriptRequest) 
				session.getAttribute("transcript_request");

			if(transReq == null)
			{
				transReq = new TranscriptRequest();
				session.setAttribute("transcript_request", transReq);
			}

			if(transReq.isStarted()) doPost(req, rsp);
			else HTMLUtils.printRedirectPage(out, 
				"You must log in to the system prior to viewing this page.", 
				"Login");			
		}
		catch(Exception e)
		{
			try
			{
				HTMLUtils.printException(out, e);
			}
			catch(Exception e2) {}	
		}		
	}

	public void doPost(HttpServletRequest req, HttpServletResponse rsp)
	{
		PrintWriter out = null;

		try
		{
			rsp.setContentType("text/html");
			out = rsp.getWriter();			

			if(req.getCookies() == null)
			{
				HTMLUtils.printRedirectPage(out,
					"You must enable cookies in your browser before using the advisement system.",
					"Login");

				return;
			}

			HttpSession session = req.getSession(false);

			if(session == null)
			{
				HTMLUtils.printRedirectPage(out,
					"You must login to the system prior to viewing this page.",
					"Login");

				return;
			}

			TranscriptRequest treq = (TranscriptRequest) 
				session.getAttribute("transcript_request");

			if(treq == null)
			{
				treq = new TranscriptRequest();
				session.setAttribute("transcript_request", treq);
			}

			if(!treq.isStarted())
			{
				String userId, password;

				if((userId = req.getParameter("userid")) == null)
				{
					throw new FrontEndException(
						"Missing POST Data: userid");
				}

				if((password = req.getParameter("password")) == null)
				{
					throw new FrontEndException(
						"Missing POST Data: password");
				}

				String errorMsg;
				if((errorMsg = InputChecker.isLoginOk(userId, password)) != null)
				{
					HTMLUtils.printRedirectPage(out, errorMsg, "Login");
					return;				
				}
	
				treq.start(userId, password);
			}

			HTMLUtils.printHeader(out, PAGE_TITLE);

			out.println("<FORM method=\"post\" action=\"Output\">");

			HashMap majors = RetrieverUtils.getMajors();
			HashMap minors = RetrieverUtils.getMinors();

			majors.put("Please make your selection", "none");
			minors.put("Please make your selection", "none");

			out.println("<P>");
			HTMLUtils.printSelect(out, "Major", "major", majors, 
				"Please make your selection");

			majors.remove("Please make your selection");
			majors.put("None", "no");
			out.println("<P>");
			HTMLUtils.printSelect(out, "Second Major", "secondmajor", majors, "None");

			out.println("<P>");
			HTMLUtils.printSelect(out, "Minor", "minor", minors, 
				"Please make your selection");

			out.println("<P>");
			HTMLUtils.printTextBox(out, "text", 
				"If you are a transfer student, how many CORE credits are you required to take?",
				"coreneeded", "(Leave blank if you don't know.)", null, null);

			out.println("<P>");
			out.println("<INPUT type=\"submit\" value=\"Submit\">");
			out.println("</FORM>");

			HTMLUtils.printFooter(out);
		}
		catch(Exception e)
		{
			if(out != null)
			{
				try
				{
					HTMLUtils.printException(out, e);
				}
				catch(Exception e2) {}
			}
		}	
	}
}