package cs320.servlet;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletConfig;
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 cs320.model.GuestBookEntry;

@WebServlet(urlPatterns = "/GuestBook", loadOnStartup = 1)
public class GuestBook extends HttpServlet {

    private static final long serialVersionUID = 1L;

    public GuestBook()
    {
        super();
    }

    public void init( ServletConfig config ) throws ServletException
    {
        super.init( config );

        try
        {
            Class.forName( "com.mysql.jdbc.Driver" );
        }
        catch( ClassNotFoundException e )
        {
            throw new ServletException( e );
        }
    }

    protected void doGet( HttpServletRequest request,
        HttpServletResponse response ) throws ServletException, IOException
    {
        List<GuestBookEntry> entries = new ArrayList<GuestBookEntry>();
        Connection c = null;
        try
        {
            String url = "jdbc:mysql://localhost/cs320stu31";
            String username = "cs320stu31";
            String password = "abcd";

            c = DriverManager.getConnection( url, username, password );
            Statement stmt = c.createStatement();
            ResultSet rs = stmt.executeQuery( "select * from guestbook" );

            while( rs.next() )
            {
                GuestBookEntry entry = new GuestBookEntry( rs.getInt( "id" ),
                    rs.getString( "name" ), rs.getString( "message" ) );
                entries.add( entry );
            }
        }
        catch( SQLException e )
        {
            throw new ServletException( e );
        }
        finally
        {
            try
            {
                if( c != null ) c.close();
            }
            catch( SQLException e )
            {
                throw new ServletException( e );
            }
        }

        request.setAttribute( "entries", entries );
        request.getRequestDispatcher( "/WEB-INF/GuestBook.jsp" ).forward(
            request, response );
    }

    protected void doPost( HttpServletRequest request,
        HttpServletResponse response ) throws ServletException, IOException
    {
        doGet( request, response );
    }

}