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();  
    	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 can pick up 1,2, or 3 at a time.\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);
    }
    
    private void userMove() {
        int userTakes = Integer.parseInt(inField.getText());
        if (game.takeAway(userTakes)) {
            display.append("You take " + userTakes + ".\n");
	    } else {
            display.append("Sorry, you can't take " + userTakes + ". Try again\n");
	    }
    }

    private void computerMove() {
        int maxTakeAway = Math.min(game.sticksLeft(), TakeAwayGame.MAX_TAKE_AWAY);
        int computerTakes = 1 + (int)(Math.random() * maxTakeAway);
	    game.takeAway(computerTakes);
        display.append("I take " + computerTakes + ". ");
    }

    public void actionPerformed(ActionEvent e) {
	    int sticksLeft = 0;
        if (e.getSource() == goButton || e.getSource() == inField) {
            userMove();
            if (game.gameOver() == false)
                if (game.getPlayer() == game.COMPUTER) 
                    computerMove();
            sticksLeft = game.sticksLeft();
            display.append("There are " + sticksLeft + " sticks left.\n");

            if (game.gameOver()) {
                goButton.setEnabled(false);  // End the game
                inField.setEnabled(false);
                if (game.getWinner() == game.USER)
                    display.append("Game over. You win. Nice game.\n");
                else
                    display.append("Game over. I win. Nice game.\n");
            }
        }
    } //actionPerformed()
}