import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

/**
 * This class represents a GUI for a basic rock-paper-scissors game.
 * @author Marty Stepp
 * @version CSE 331 Spring 2011, 5/2/2011
 */
public class RockPaperScissorsGui {
	private JFrame frame;
	private JButton play;
	private JButton switchViews;
	private View view;
	private Game game;
	
	/**
	 * Constructs the GUI and displays it on the screen.
	 */
	public RockPaperScissorsGui() {
		game = Game.getInstance();
		setupComponents();
		handleEvents();
		doLayout();
		frame.setVisible(true);
	}
	
	// sets up graphical components in the window
	private void setupComponents() {
		frame = new JFrame("Rock-Paper-Scissors");
		frame.setLocation(300, 100);
		frame.setSize(400, 300);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		view = new TextView(game);
		
		play = new JButton("Play");
		switchViews = new JButton("Switch Views");
	}
	
	// attaches various listeners to handle events
	private void handleEvents() {
		ActionListener listener = new ButtonListener();
		play.addActionListener(listener);
		switchViews.addActionListener(listener);
	}
	
	// sets up containers for layout in the window
	private void doLayout() {
		Container south = new JPanel(new FlowLayout());
		south.add(play);
		south.add(switchViews);

		frame.add(view, BorderLayout.CENTER);
		frame.add(south, BorderLayout.SOUTH);
	}
	
	// This observer responds to changes in the state of the TTT game
	
	// This listener responds to clicks on the "Play" button.
	private class ButtonListener implements ActionListener {
		/**
		 * Called when the Play button is clicked.
		 * Plays a new game round of tic-tac-toe.
		 */
		public void actionPerformed(ActionEvent event) {
			if (event.getSource() == play) {
				game.playRound();
			} else {
				// switch views
				frame.remove(view);
				
				// hey view, stop listening now.
				view.goAway();
				
				if (view instanceof TextView) {
					view = new ImageView(game);
				} else {
					view = new TextView(game);
				}
				
				frame.add(view, BorderLayout.CENTER);
				
				// tell Java to update the layout on the screen
				frame.validate();
			}
		}
	}
}