import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class TakeAwayGUI extends JFrame implements ActionListener {
    private JTextArea display;
    private JTextField inField;
    private JButton goButton;
    private TakeAwayGame game;
	    
    public TakeAwayGUI(String title) {
        game = new TakeAwayGame(21);  
    	buildGUI();
        setTitle(title);
        pack();
        show();
    }
        
    private void buildGUI() {
        Container contentPane = getContentPane();
    	contentPane.setLayout(new BorderLayout());
        display = new JTextArea(20,30);
        display.setText("Let's play Take Away. There are " + game.sticksLeft() + "sticks.\n" +
                        "You go first.\n");
        inField = new JTextField(10);
        inField.addActionListener(this);
        goButton = new JButton("Take Away!");
        goButton.addActionListener(this);
        JPanel inputPanel = new JPanel();
        inputPanel.add(new JLabel("How many sticks do you take: "));
        inputPanel.add(inField);
        inputPanel.add(goButton);
        contentPane.add("Center", display);
        contentPane.add("South", inputPanel);
    }
    
    public void actionPerformed(ActionEvent e) {
	int sticksLeft = 0;
        if (e.getSource() == goButton || e.getSource() == inField) {
	    String inString = inField.getText();
            int userTakes = Integer.parseInt(inString);
            game.takeAway(userTakes);
            sticksLeft = game.sticksLeft();
            display.append("There are " + sticksLeft + " sticks left.\n");
            if (sticksLeft <= 0) {
                display.append("Game over. I win. Nice game.\n");
	    } else {
                int computerTakes = 1 + (int)(Math.random() * 3);
                game.takeAway(computerTakes);
                sticksLeft = game.sticksLeft();
                display.append("I take " + computerTakes + ". ");
                display.append("There are " + sticksLeft + " sticks left.\n");
                if (sticksLeft <= 0) {
                    display.append("Game over. You win. Nice game.\n");
                }
            }
        }
        if (sticksLeft <= 0) {
            goButton.setEnabled(false);
            inField.setEnabled(false);
        }
    }
}