/** ClickClackCloe.java is a simple "get 3 in a row" game...
 */
import javax.swing.*;     // JApplet, JButton, ...
import java.awt.*;        // BorderLayout, Color, ...
import java.awt.event.*;  // ActionEvent, ActionListener, ...

public class ClickClackCloe extends JApplet {
  private final int MY_ROWS = 3,
                    MY_COLUMNS = 3;

  public void init() {
     myGrid = new JButton[MY_ROWS][MY_COLUMNS];
     JPanel contentPane = new JPanel( new BorderLayout() );
     contentPane.setBorder( BorderFactory.createEtchedBorder() );
     JPanel topPane = new JPanel( new FlowLayout() );
     topPane.setBorder( BorderFactory.createEmptyBorder(5,5,5,5) );
     myFeedbackLabel = new JLabel("Red vs. Blue. Red's turn");
     topPane.add(myFeedbackLabel);
     contentPane.add(topPane, BorderLayout.NORTH);
     JPanel gridPane = new JPanel( new GridLayout(MY_ROWS, 
                                                  MY_COLUMNS) );
     gridPane.setBorder( BorderFactory.createEtchedBorder() );
     ButtonListener buttonListener = new ButtonListener();
     for (int r = 0; r < MY_ROWS; r++) {
        for (int c = 0; c < MY_COLUMNS; c++) {
           myGrid[r][c] = new JButton();
           myGrid[r][c].setBackground(Color.WHITE);
           myGrid[r][c].addActionListener(buttonListener);
           gridPane.add(myGrid[r][c]);
        }
     }
     contentPane.add(gridPane);
     this.setContentPane(contentPane);
  }

   private class ButtonListener implements ActionListener {
     public void actionPerformed(ActionEvent event) {
        if ( !gameIsDone ) {
           Object eventSource = event.getSource();
           if (eventSource instanceof JButton) {
              JButton buttonClicked = (JButton) eventSource;
              if (itsRedsTurn) {
                  handleClick(buttonClicked, Color.RED,
                               "Red", "Blue");
              } else {
                  handleClick(buttonClicked, Color.BLUE,
                               "Blue", "Red");
              }
           }
         }
     }

     private void handleClick(JButton button, Color color,
                               String thisPlayer, String nextPlayer) {
        if (button.getBackground() == Color.WHITE) {
           button.setBackground(color);
           if ( this.gameOver() ) {
              myFeedbackLabel.setText(thisPlayer + " WINS!");
              gameIsDone = true;
           } else {
              myFeedbackLabel.setText(nextPlayer + "'s turn.");
           }
           itsRedsTurn = !itsRedsTurn;
         }
     }

     private boolean gameOver() {
        if ( checkDiagonals() ) return true;
        else if ( checkRows() ) return true;
        else if ( checkColumns() ) return true;
        else { return false; }
     }

     private boolean checkColumns() {
    	for (int c = 0; c < MY_COLUMNS; c++) {
    		Color startColor = myGrid[0][c].getBackground();
    		if ( startColor != Color.WHITE
    		   && startColor == myGrid[1][c].getBackground()
    		   && startColor == myGrid[2][c].getBackground()) {
    			return true;
    		}
    	}
    	return false;
     }

     private boolean checkRows() {
    	 for (int r = 0; r < MY_ROWS; r++) {
    		 Color startColor = myGrid[r][0].getBackground();
    		 if ( startColor != Color.WHITE
    	       && startColor == myGrid[r][1].getBackground()
    		   && startColor == myGrid[r][2].getBackground()) {
    			 return true;
    		 }
    	 }
    	 return false;
     }

     private boolean checkDiagonals() {
    	 Color middleColor = myGrid[1][1].getBackground();
    	 if (middleColor != Color.WHITE) {
    		 return middleColor == myGrid[0][0].getBackground()
    		 	 && middleColor == myGrid[2][2].getBackground() ||
    		        middleColor == myGrid[0][2].getBackground()
    		     && middleColor == myGrid[2][0].getBackground();
    	 }
    	 return false;
      }
  }

  private JButton [][]      myGrid = null;
  private JLabel            myFeedbackLabel = null;
  private boolean           itsRedsTurn = true,
                            gameIsDone = false;
  private static final long serialVersionUID = 1L;
}