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

public class HitShrew extends JFrame {
	ImageIcon hamtaro = new ImageIcon(getClass().getResource("Hamtaro.jpg"));
	int n=5;  //width & height
	int gameLength=30;  //seconds
	int score;
	long startTime;
	ShrewButton[] button;
	JLabel status;
	public HitShrew() {
		super("Hit Shrew");
		Container c=getContentPane();
		JPanel gamePanel = new JPanel();
		gamePanel.setLayout(new GridLayout(n,n));
		button = new ShrewButton[n*n];
		for(int i=0; i<n*n; i++) {
			button[i] = new ShrewButton(hamtaro,this);
			button[i].setNumber(n);
			button[i].setBackground(Color.lightGray);
			gamePanel.add(button[i]);
		}
		status = new JLabel("Prepared!");
		c.add(gamePanel, BorderLayout.CENTER);
		c.add(status, BorderLayout.SOUTH);
		setBounds(150,150,500,500);
		show();
		init();
	}
	public void init() {
		JOptionPane.showMessageDialog(this,"箇稱!");
		startTime = System.currentTimeMillis()/1000;
		for(int i=0;i<n*n;i++) {
			button[i].setStartTime(startTime);
			button[i].setGameLength(gameLength);
			new Thread(button[i]).start();
		}
		long t=0;
		while( (t=System.currentTimeMillis()/1000) < startTime+gameLength) {
			t = startTime+gameLength - t;
			status.setText("Time:" + t + " Scores:" + score*10);
			Thread.yield();
		}
		status.setText("Finish! You get " + score*10 + " points!");
	}
	public void setScore(int score) {
		this.score+=score;
	}
	public static void main(String[] args) {
		HitShrew obj = new HitShrew();
		obj.setDefaultCloseOperation(EXIT_ON_CLOSE);
	}
}

class ShrewButton extends JButton implements Runnable,ActionListener {
	long startTime;
	long endTime;
	ImageIcon ic;
	boolean flag=false;
	int score;
	int n;
	HitShrew controller;
	public ShrewButton(ImageIcon ic, HitShrew controller) {
		this.ic = ic;
		this.controller = controller;
		addActionListener(this);
	}
	public void setNumber(int n) {
		this.n = n;
	}
	public void setStartTime(long second) {
		startTime = second;
	}
	public void setGameLength(long second) {
		endTime=startTime+second;
	}
	public void run() {
		while ( System.currentTimeMillis()/1000 < endTime) {
			int flag = (int) (Math.random()*n*n);
			setBackground(Color.lightGray);
			if (flag == 1) {
				setIcon(ic);
				setFlag(true);
			}
			else {
				setIcon(null);
				setText("");
				setFlag(false);
			}
			try {
				Thread.sleep(750);
			}
			catch(InterruptedException e) {
				System.out.println("Unexpected exception!");
			}
			setIcon(null);
			setText("");
			setFlag(false);
		}
		setIcon(null);
		setBackground(Color.lightGray);
		setText(score + " hit!");
	}
	public void setFlag(boolean flag) {
		this.flag = flag;
	}
	public boolean getFlag() {
		return flag;
	}
	public void actionPerformed(ActionEvent e) {
		if ( this.flag == true) {
			setFlag(false);
			setText("HIT!");
			setBackground(Color.red);
			setIcon(null);
			score++;
			controller.setScore(1);
		}
	}
}