package isg;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import java.util.List;

import javax.jdo.PersistenceManager;
import javax.servlet.http.*;

@SuppressWarnings("serial")
public class ISGServlet extends HttpServlet {
private String[] PlayerActions = { "display_all", "uname_available", "create_user", "authenticate" };

    @SuppressWarnings("unchecked")
    public Player getPlayer( PersistenceManager pm, String name ) {
        javax.jdo.Query query = pm.newQuery( Player.class, "this.playerName == name");
        query.declareParameters("String name");
        List<Player> players = (List<Player>)query.execute(name);

        if( players.isEmpty() ) {
            return null;
        }

        // there should either be 0 matches or 1 match
        return players.get(0);
    }

    public boolean isPlayerAction( String action ) {
        for( String availableAction:PlayerActions )
            if( availableAction.equals( action ) )
                return true;

        return false;
    }

    // note: user input sanitization should be done on the client ( eg. checking inputs are not null, etc. )
    @SuppressWarnings("unchecked")
    public void doGet( HttpServletRequest req, HttpServletResponse resp )
            throws IOException {
        PrintWriter out = resp.getWriter();
        resp.setContentType("text/plain");

        String username   = req.getHeader( "username" );
        String action     = req.getHeader( "action" );

        if( action == null ) {
            action   = req.getParameter( "action" );
            username = req.getParameter( "username" );
        }

        if( isPlayerAction( action ) ) {
            if( action.equals("display_all") ) {
                PersistenceManager pm = PMF.get().getPersistenceManager();
                javax.jdo.Query query = pm.newQuery( Player.class );
                List<Player> players = (List<Player>)query.execute();

                for( Player p:players ) {
                    out.println( "Name    : " + p.getName() );
                    out.println( "Password: " + p.getPassword() );
                    out.println( "Email   : " + p.getEmail() );
                    out.println( "ShipName: " + p.getShipName() + "\n\n" );
                }
            }

            else if( action.equals("uname_available") ) {
                PersistenceManager pm = PMF.get().getPersistenceManager();
                int returnValue = ( getPlayer( pm, username ) == null ) ? 0 : 1;
                out.print( returnValue );
            }
            else if( action.equals("create_user") ) {
                String password, email, ship;

                if( req.getHeader("action") != null ) {
                    password = req.getHeader( "password" );
                    email    = req.getHeader( "email" );
                    ship        = req.getHeader( "shipName" );
                }
                else {
                    password = req.getParameter( "password" );
                    email    = req.getParameter( "email" );
                    ship        = req.getParameter( "shipName" );
                }

                int returnValue = 0;
                PersistenceManager pm = PMF.get().getPersistenceManager();
                if( getPlayer( pm, username ) == null ) {
                    Player player = new Player( username, password, email, ship );

                    try {
                        pm.makePersistent( player );
                    } finally {
                        pm.close();
                    }

                    returnValue = 1;
                }

                out.print( returnValue );
            }
            else if( action.equals("authenticate") ) {
                PersistenceManager pm = PMF.get().getPersistenceManager();

                String password;

                if( req.getHeader("action") != null )
                    password = req.getHeader("password");
                else
                    password = req.getParameter("password");

                out.println("received name : " + username);
                out.println("received pass : " + password);

                Player p = getPlayer( pm, username );
                int returnValue = 0;

                if( p != null )
                  returnValue = p.getPassword().equals( password ) ? 1 : 0;

                out.print( returnValue );
            }
        }
        else
            out.print("the action I received was : " + action );
    }

    public void doPost( HttpServletRequest req, HttpServletResponse resp )
            throws IOException {
        // redirect all POST requests to a common handler
        doGet( req, resp );
    }
}