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import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.*;
import javax.servlet.ServletException;
import java.util.ArrayList;
//import javax.servlet.http.HttpServlet;
//import javax.servlet.http.HttpServletRequest;
//import javax.servlet.http.HttpServletResponse;
import java.sql.*;

/**
 *
 * @author Owner
 */
public class Insert_Servlet extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        HttpSession mySession = request.getSession();
        ArrayList uNames = (ArrayList)mySession.getAttribute("uNames");
        String UName = request.getParameter("txtUsername");
        String PWord = request.getParameter("txtPassword");
        String error = null;

        if(UName != null && PWord != null)
        {
           if(UName.trim().length() > 0 && PWord.trim().length() > 0)
           {

            if(UName.matches("^[A-za-z0-9]+$") && PWord.matches("^[A-Za-z0-9]+$"))
            {
                if(uNames !=null)
                {
                    if(!uNames.contains(UName))
                    {
 // write record to database
                String dbURL = "jdbc:odbc:dbJDBC1";
                String sql = "INSERT INTO tUsers (username,password) VALUES('" + UName + "','" + PWord + "')";

                try
                {
                    Connection conn = DriverManager.getConnection(dbURL);
                    Statement s = conn.createStatement();
                    s.executeUpdate(sql);
                    s.close();
                    conn.close();
                    response.sendRedirect("Admin_Servlet");


                }
                    catch(SQLException e)
                    {

                    }
               }
                    else
                    {
                        error = "Primary key violation....("+ UName + ")...Enter new username!";
                    }
                }
                else
                {
                    error ="Cookies need to be enabled!";
                }

            }
            else
            {
                error = "Fields contain invalid characters!";
            }
          }
           else
           {
                error="Fields must be completed!";
           }
        }
        try {

            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet Insert_Servlet</title>");
            out.println("</head>");
            out.println("<body style = 'font-family: Verdana, Arial, Sans-Serif'>");
            out.println("<h2 align='center'>Insert_Servlet</h2>");
            if(error != null)
            {
                out.println("<p>" +  error + "</p>");
            }
            out.println("<form action='Insert_Servlet' method='post'>");
            out.println("<table align='center'>");
            out.println("<tr>");
            out.println("<td align='right'>Username:<input type='text' name='txtUsername' /></td>");
            out.println("</tr>");
            out.println("<tr>");
            out.println("<td align='right'>Password:<input type='text' name='txtPassword' /></td>");
            out.println("</tr>");
            out.println("<tr>");
            out.println("<td align='center' colspan='2'><input type='submit' value='Write Record' /></td>");
            out.println("</tr>");
            out.println("</table>");
            out.println("</form>");
            out.println("</body>");
            out.println("</html>");


        } finally {
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}