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

/**
 * An HTTP Servlet that responds to the GET and HEAD methods of the
 * HTTP protocol.  It returns a form to the user that gathers data.
 * The form POSTs to another servlet.
 */
public class MyCashierServlet extends HttpServlet { 

    public void doGet (HttpServletRequest request,
                       HttpServletResponse response)
	throws ServletException, IOException
    {
        // Get the user's session and shopping cart
        HttpSession session = request.getSession(true);
        MyCart cart =
            (MyCart)session.getValue(session.getId());
        
        // If the user has no cart, create a new one
        if (cart == null) {
            cart = new MyCart();
            session.putValue(session.getId(), cart);
	}

	// set content-type header before accessing Writer
        response.setContentType("text/html");
	PrintWriter out = response.getWriter();

	// then write the data of the response
        out.println("<html>" +
                    "<head><title> Cashier </title></head>" +

                    "<body  bgcolor=\"#ffffff\">" +
                    "<center>" +
                    "<hr> <br> &nbsp;" +
                    "<h1>" +
                    "<font size=\"+3\" color=\"red\">Duke's </font>" +
                    "<font size=\"+3\" color=\"purple\">Bookstore</font>" +
                    "</h1>" +
                    "</center>" +
                    "<br> &nbsp; <hr> <br> &nbsp;");

        // Determine the total price of the user's books
        MyCashier cashier = new MyCashier(cart);
	double total = cashier.getTotal();

        // Print out the total and the form for the user
        out.println("<p>Your total purchase amount is: " +
                    "<strong>" + cashier.format(total) + "</strong>" +
                    "<p>To purchase the items in your shopping cart," +
                    "please provide us with the following information:" +

                    "<form action=\"" +
                    response.encodeUrl("/servlet/receipt") +
                    "\" method=\"post\">" +

                    "<table>" +
                    "<tr>" +
                    "<td><strong>Name:</strong></td>" +
                    "<td><input type=\"text\" name=\"cardname\"" +
                    "value=\"Gwen Canigetit\" size=\"19\"></td>" +
                    "</tr>" +

                    "<tr>" +
                    "<td><strong>Credit Card Number:</strong></td>" +
                    "<td>" +
                    "<input type=\"text\" name=\"cardnum\" " +
                    "value=\"xxxx xxxx xxxx xxxx\" size=\"19\"></td>" +
                    "</tr>" +

                    "<tr>" +
                    "<td></td>" +
                    "<td><input type=\"submit\"" +
                    "value=\"Submit Information\"></td>" +
                    "</tr>" +

                    "</table>" +
                    "</form>" +
                    "</body>" +
                    "</html>");
        out.close();
    }

    public String getServletInfo() {
        return "The Cashier servlet takes the user's name and " +
               "credit-card number so that the user can buy the books.";

    }
}