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import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
//import java.sql.SQLException;
import java.sql.Statement;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.sql.*;

/**
 *
 * @author HP
 */
@WebServlet(urlPatterns = {"/Bloginservlet"})
public class Bloginservlet 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");
        try (PrintWriter out = response.getWriter()) {
            /* TODO output your page here. You may use following sample code. */
            out.println("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet Bloginservlet</title>");
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet LoginServlet at " + request.getContextPath() + "</h1>");
            out.println("</body>");
            out.println("</html>");
        }
    }

    // <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);
        dbConnection(request,response);
    }
    Connection connection;
        String urldb="jdbc:postgresql://localhost:5433/WADTRV15002";                     //step 6
        String userdb="postgres";
        String passworddb="wal@gecbh2012";
        String username = null;
        String pwd = null;
    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>


    public void dbConnection(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
        PrintWriter out = response.getWriter();
        out.println("hiiiiii");
        try {
            Class.forName("org.postgresql.Driver");
        } catch(ClassNotFoundException e ){
              //e.getMessage();
              out.println(e.getMessage());
              out.println("Unable to find org.postgresql.Driver");
        }
        try {
                String _username = request.getParameter("username");
                String _password = request.getParameter("pwd");
                Boolean found = false;
                connection = DriverManager.getConnection(urldb, userdb, passworddb);
                out.println("Connected");
                Statement stmt = connection.createStatement();
                out.println("Statement created");
                ResultSet rs = stmt.executeQuery("select * from public.\"Registration\"");
                out.println("Table retrieved to ResultSet");
                while(rs.next())
                {
                    username = rs.getString("uname");
                    pwd = rs.getString("upassword");
                    out.println("Searching Database...");
                    if (username.equals(_username)&&pwd.equals(_password))
                    {
                        found = true;
                        break;
                    }
                }
                out.println("Database Search Success");
                if (true == found)
                {
                   out.println("Login success");
                }
                else
                {
                    out.println("Login Failed");
                }

                connection.close();
        } catch (SQLException ex) {
        out.println(ex.getMessage());
        out.println("Akhil Bugs : line 110 (try statements not performed)");
        }
    }
}