package edu.dartmouth.cs.kalah;

/**
 * @author Scot Drysdale, 8/2011
 * Holds the graphical representation of the Kalah game board.
 */
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import edu.dartmouth.cs.kalah.KalahGame;


public class KalahFrame extends JFrame implements ActionListener {
	// Needed to eliminate a compiler warning.
	private static final long serialVersionUID = 1L;
	
	private static final Color BACKGROUND_COLOR = new Color(245,220,175);
	private static final Color ACTIVE_COLOR = Color.CYAN;
	private static final Color INACTIVE_COLOR = Color.BLACK;
	private static final Color HIGHLIGHT_COLOR = Color.RED;
	
	private JButton [] buttons;             // Hold the pit and kalah buttons.
	public int moveChosen;                  // Will hold the move clicked on
	
	public KalahFrame() {
	  Container boardPane;            // Pane representing Kalah board
	  JPanel northPanel, southPanel;  // Hold the two sets of pit buttons
	  
    // Note that the content pane uses the Border Layout manager.   
		boardPane = getContentPane();
		buttons = new JButton[KalahGame.NUMPITS];
		
		boardPane.setBackground(BACKGROUND_COLOR);
		for (int i = 0; i < KalahGame.NUMPITS; i++) {
			buttons[i] = new JButton(Integer.toString(KalahGame.INITSTONES));
			buttons[i].setForeground(INACTIVE_COLOR);
			buttons[i].addActionListener(this);
		}
		
		buttons[0].setText("0");
		buttons[KalahGame.HALFPITS].setText("0");
			
		boardPane.setLayout(new BorderLayout());
		
		southPanel = new JPanel();
		southPanel.setBackground(BACKGROUND_COLOR);
		for (int i = 1; i <= KalahGame.HALFPITS; i++)
			southPanel.add(buttons[i]);
		
		northPanel = new JPanel();
		northPanel.setBackground(BACKGROUND_COLOR);
		for (int i = KalahGame.NUMPITS-1; i > KalahGame.HALFPITS; i--)
			northPanel.add(buttons[i]);
		
		boardPane.add(northPanel, BorderLayout.NORTH);
		boardPane.add(southPanel, BorderLayout.SOUTH);
		boardPane.add(buttons[0], BorderLayout.WEST);
		boardPane.add(buttons[KalahGame.HALFPITS], BorderLayout.EAST);
	}
	
	/**
	 * Graphically displays the board
	 * @param state current game state
	 */
	public void display (KalahGame state) {
		int [] board = state.getBoard();
		
		for (int i = 0; i < KalahGame.NUMPITS; i++) {
			buttons[i].setText(Integer.toString(board[i]));
		}
		
		buttons[0].setForeground(INACTIVE_COLOR);
		buttons[KalahGame.HALFPITS].setForeground(INACTIVE_COLOR);
		
		// Make one half of the board the active color.
		if(state.getPlayerNum() == 0) {
			for(int i = 1; i < KalahGame.HALFPITS; i++)
				buttons[i].setForeground(ACTIVE_COLOR);
			for(int i = KalahGame.HALFPITS+1; i < KalahGame.NUMPITS; i++)
				buttons[i].setForeground(INACTIVE_COLOR);
		}
		else {
			for(int i = 1; i < KalahGame.HALFPITS; i++)
				buttons[i].setForeground(INACTIVE_COLOR);
			for(int i = KalahGame.HALFPITS+1; i < KalahGame.NUMPITS; i++)
				buttons[i].setForeground(ACTIVE_COLOR);		
		}
		
		if(state.getPitToHightlight() >= 0) 
			buttons[state.getPitToHightlight()].setForeground(HIGHLIGHT_COLOR);
		
		repaint();
	}

	/**
	 * Handles clicking on the buttons to get moves
	 * @param event the event that tiggered this listener
	 */
	public void actionPerformed(ActionEvent event) {
		Object source = event.getSource();
		
		int buttonNum;
		
	// Look for button clicked
		for(buttonNum = 0; 
				source != buttons[buttonNum] && buttonNum < KalahGame.NUMPITS; 
				buttonNum++); 
		
		// Only want to register clicks on the user's buttons, and only
		// if the game is waiting for a move.
		if(buttonNum < KalahGame.NUMPITS && moveChosen == -1)
			moveChosen = buttonNum;
	}
}