package dtmgame;

import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.util.HashSet;
import java.util.Set;

import javax.swing.Timer;

/**
 * @author Shaohan Hu
 * 
 */
public class Particles extends Applet implements ActionListener, MouseListener,
						 MouseMotionListener {

    private static final long serialVersionUID = 1L;
    private int numParticles = 61;
    private Set<CircleParticle> particles;
    private Timer timer;
    private int delay = 61;
    private int size = 500;
    private Circle c;

    private long startTime;
    private long endTime;
    private double duration;

    private boolean gameInProgress = true;

    private boolean moreCircleNeeded = true;

    public void init() {
	setSize(size, size);
	this.addMouseListener(this);
	this.addMouseMotionListener(this);
	c = new Circle(30, new Point(-30, -30));
	particles = new HashSet<CircleParticle>();
	for (int i = 0; i < numParticles; i++) {
	    CircleParticle pt = new CircleParticle((int) (Math.random() * size),
						   (int) (Math.random() * size),
						   2, // (int) (Math.random() * 10),
						   (int) (Math.random() * 5) + 1, (int) (Math.random() * 5) + 1, 0, 500,
						   0, 500);
	    particles.add(pt);
	}
	timer = new Timer(delay, this);
	timer.start();
	setSize(size, size);
	repaint();
    }

    public void printEndMsg(Graphics g) {
	g.setColor(Color.black);
	g.fillRect(0, 0, size, size);
	g.setColor(Color.white);
	g.drawString("You survived " + duration + " seconds.", size - 200,
		     size - 20);
	g.drawString("You survived " + duration + " seconds.", size - 201,
		     size - 20);
	g.drawString("You survived " + duration + " seconds.", size - 201,
		     size - 21);
    }

    public void paint(Graphics g) {
	if (gameInProgress) {
	    drawParticles(g);
	    if (moreCircleNeeded) {
		c.drawPreview(g);
	    } else {
		c.drawCircle(g);
		examine();
	    }
	} else {
	    printEndMsg(g);
	    drawParticles(g);
	    c.drawCircle(g);
	}
    }

    public void examine() {
	for (CircleParticle pt : particles) {
	    if (c.isTouched(pt.getPosition())) {
		endTime = System.currentTimeMillis();
		timer.stop();
		this.gameInProgress = false;
		duration = (endTime - startTime) / 1000.0;
		this.removeMouseListener(this);
		this.removeMouseMotionListener(this);
		this.setEnabled(false);
		repaint();
	    }
	}
    }

    public void drawParticles(Graphics g) {
	for (CircleParticle pt : particles) {
	    pt.drawParticle(g);
	}
    }

    public void updateAllParticlePositions() {
	for (CircleParticle pt : particles) {
	    pt.takeOneStep();
	}
    }

    public void actionPerformed(ActionEvent e) {
	this.updateAllParticlePositions();
	repaint();
    }

    public void mouseClicked(MouseEvent e) {
	// TODO Auto-generated method stub

    }

    public void mouseEntered(MouseEvent e) {
	this.mouseMoved(e);
    }

    public void mouseExited(MouseEvent e) {
	// TODO Auto-generated method stub

    }

    public void mousePressed(MouseEvent e) {
	if (this.gameInProgress) {
	    if (this.moreCircleNeeded) {
		startTime = System.currentTimeMillis();
		this.moreCircleNeeded = false;
		repaint();
	    }
	}
    }

    public void mouseReleased(MouseEvent e) {
	// TODO Auto-generated method stub

    }

    public void mouseDragged(MouseEvent e) {
	this.mouseMoved(e);
    }

    public void mouseMoved(MouseEvent e) {
	if (this.gameInProgress) {
	    this.c.setPosition(e.getPoint());
	    repaint();
	}
    }
}