/*
 * File: OneRowNimPanel.java
 * Author: Java Java Java
 * Description: This application plays One Row Nim via a GUI interface.
 */
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;

public class OneRowNimPanel extends JPanel implements ActionListener
{   private JTextArea display;
    private JTextField inField;
    private JButton goButton;
    private OneRowNim game;
	    
    public OneRowNimPanel() 
    {   game = new OneRowNim(21);  
        buildGUI();
    } // OneRowNimPanel()

    private void buildGUI() 
    {   Container contentPane = this;
        setBorder(BorderFactory.createTitledBorder("OneRowNim Game"));
        contentPane.setLayout(new BorderLayout());
        display = new JTextArea(20,30);
        display.setText("Let's play Take Away. There are " + game.getSticks() + 
            " sticks.\n" + "Pick up 1,2, or 3 at a time.\n" + "You go first.\n");
        inField = new JTextField(10);
        goButton = new JButton("Take Sticks");
        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);
    } // buildGUI

    private void userMove()
    {   int userTakes = Integer.parseInt(inField.getText());
        if (game.takeSticks(userTakes)) 
            display.append("You take " + userTakes + ".\n");
        else 
            display.append("You can't take " + userTakes + ". Try again\n");
    } // userMove()

    private void computerMove() 
    {   if (game.gameOver()) return;
        if (game.getPlayer() == 2) 
        {   game.takeSticks(1); // Temporary strategy
            display.append("I take one stick. ");
        } // if
    } // computerMove()

    private void endGame()
    {   goButton.setEnabled(false);  // Disable button and textfield
        inField.setEnabled(false);
        if (game.getWinner() == 1)
            display.append("Game over. You win. Nice game.\n");
        else  
            display.append("Game over. I win. Nice game.\n");
    } // endGame()

    public void actionPerformed(ActionEvent e) 
    {   if (e.getSource() == goButton) 
        {   userMove();
            computerMove();
            int sticksLeft = game.getSticks();
            display.append("There are " + sticksLeft + " sticks left.\n");
            if (game.gameOver()) endGame();
        } // if
    } // actionPerformed()

} // OneRowNimPanel