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package org.millstone.examples.gogame;

import org.millstone.base.Application;
import org.millstone.base.data.Item;
import org.millstone.base.data.Property;
import org.millstone.base.data.util.IndexedContainer;
import org.millstone.base.event.*;
import org.millstone.base.ui.*;

/** The classic game 'Go' as an example for the Millstone framework. 
 *
 * @author IT Mill Ltd.
 * @see org.millstone.base.Application
 */
public class Go
    extends Application
    implements Action.Handler, Property.ValueChangeListener {

    /* An IndexedContainer will hold the list of players - it can be
     * displayed directly by the 'Table' ui component. */
    private static IndexedContainer players = new IndexedContainer();
    
    // This action will be triggered when a player challenges another.
    private static Action challengeAction = new Action("Challenge", null);

    // The players can have a current game.
    static {
        players.addContainerProperty("Current game", Game.class, null);
    }

    // The layout
    private CustomLayout layout = new CustomLayout("goroom");
    
    // Label to be displayed in the login window.
    private TextField loginName = new TextField("Who are you stranger?", "");

    // Button for leaving the game
    private Button leaveButton = new Button("Leave game", this, "close");

    // Button for logging in        
    private Button loginButton = new Button("Enter game", this, "login");
    

    // A 'Table' ui component will be used to show the list of players.
    private Table playersTable;
    
    // Our Go-board ('Board') component.
    private Board board = null;

    /** The initialization method that is the only requirement for
     * inheriting the org.millstone.base.service.Application class. It will
     * be automatically called by the framework when a user accesses the
     * application.
     * We'll initialize our components here.
     */
    public void init() {

        // Use the GO theme that includes support for goboard component
        // and goroom layout
        setTheme("gogame");

        // Initialize main window with created layout
        addWindow(new Window("Game of GO",layout));
        
        // Xreate a table for showing the players in the IndexedContainer 'players'.
        playersTable = new Table("Players", players);
        playersTable.setRowHeaderMode(Table.ROW_HEADER_MODE_ID);
        playersTable.setColumnHeaderMode(Table.COLUMN_HEADER_MODE_ID);
        playersTable.addActionHandler(this);
        playersTable.setPageBufferingEnabled(false);

        // Add the Table and a Button to the main window.       
        layout.addComponent(playersTable,"players");
        layout.addComponent(leaveButton,"logoutbutton");

        // Hide game components
        leaveButton.setVisible(false);
        playersTable.setVisible(false);

        // Add login functionality
        layout.addComponent(loginName,"loginname");
        loginButton.dependsOn(loginName);
        layout.addComponent(loginButton,"loginbutton");
    }

    /** This function is called when a player tries to log in.
     */
    public void login() {
        String name = loginName.toString();
        if (name.length() > 0 && !players.containsId(name)) {

            // Login successful
            setUser(name);

            // Add user to player list.
            Item user = players.addItem(name);
            ((Property.ValueChangeNotifier) 
                user.getItemProperty("Current game")).addListener(this);

            // Update visible components
            layout.removeComponent(loginName);
            layout.removeComponent(loginButton);
            leaveButton.setVisible(true);
            playersTable.setVisible(true);
        }
    }

    // On logout, remove user from the player list
    public void close() {
        if (getUser() != null) {
            
            // Remove user from the player list.
            players.removeItem(getUser());
        }
        super.close();
    }


    /** Implementing the Action.Handler interface - this function returns
     * the available actions.
     * @see org.millstone.base.event.Action.Handler
     */
    public Action[] getActions(Object target, Object source) {
        Property p = players.getContainerProperty(target, "Current game");
        if (p != null && target != null && !target.equals(getUser())) {
            Game game = (Game) p.getValue();
            if (game == null) {
                return new Action[] { challengeAction };
            }
        }

        return new Action[] {
        };
    }

    /** Implementing the Action.Handler interface - this function handles
     * the specified action.
     * @see org.millstone.base.event.Action.Handler
     */
    public void handleAction(Action action, Object sender, Object target) {
        if (action == challengeAction) {
            Property p = players.getContainerProperty(target, "Current game");
            if (p != null && target != null && !target.equals(getUser())) {
                Game game = (Game) p.getValue();
                if (game == null) {
                    game = new Game(9, (String) getUser(), (String) target);
                    p.setValue(game);
                    players.getContainerProperty(getUser(), "Current game").setValue(
                        game);
                }
            }
        }
    }

    /** Implementing the Property.ValueChangeListener interface - this function 
     * is called when a value change event occurs.
     * @see org.millstone.base.data.Property.ValueChangeListener
     */
    public void valueChange(Property.ValueChangeEvent event) {
        if (board != null)
            layout.removeComponent(board);
        Game game = (Game) event.getProperty().getValue();
        if (game != null) {
            board = new Board(game, game.getBlackPlayer() == getUser());
            layout.addComponent(board,"board");
        }
    }
}

/* This Millstone sample code is public domain. *  
 * For more information see www.millstone.org.  */