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

public class LetterCanvas extends JPanel{
	Font font = new Font("SansSerif", Font.BOLD, 16);
	FontMetrics metrics = null;
	int letterHeight = 0;
	int overLetterIndex = -1;
	HangmanGame game = null;

	public LetterCanvas(){
		metrics = getFontMetrics(font);
		addMouseMotionListener(new MouseHandler());
		addMouseListener(new MouseHandler());
	}

	public void paint(Graphics g){
		int x = 10;
		int y = 0;
		String letters = game.letters;
		if(letters == null){
			return;
		}
		letterHeight = metrics.getHeight() + 4;
		g.setColor(new Color(127, 127, 255));
		g.fillRect(0, 0, getWidth(), getHeight());
		g.setFont(font);
		for (int i = 0; i < letters.length(); i++){
			String letter = letters.substring(i, i + 1);
			if(i == overLetterIndex){
				g.setColor(Color.gray);
				g.fillRect(0, y + 1, getWidth(), letterHeight);
			}
			g.setColor(Color.black);
			g.drawString(letter, x, y + metrics.getHeight());
			y+= letterHeight;
			g.drawLine(0, y, getWidth(), y);
		}
	}

	class MouseHandler implements MouseMotionListener, MouseListener{
		public void mouseMoved(MouseEvent e){
			overLetterIndex = e.getY()/letterHeight;
			if(overLetterIndex >= game.letters.length()){
				overLetterIndex = -1;
			}
			repaint();
		}

		public void mouseDragged(MouseEvent e){
		}

		public void mousePressed(MouseEvent e){
			if(overLetterIndex > -1){
				game.tryLetter(overLetterIndex);
			}
		}

		public void mouseReleased(MouseEvent e){
		}

		public void mouseClicked(MouseEvent e){
		}

		public void mouseExited(MouseEvent e){
			overLetterIndex = -1;
			repaint();
		}

		public void mouseEntered(MouseEvent e){
		}
	}
}