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


public class Base extends JApplet implements  Runnable, MouseListener, ComponentListener {

    //Thanks, Mr. Fry
    public static final String javaVersionName = System.getProperty("java.version").substring(0,3);
    public static final float javaVersion =  new Float(javaVersionName).floatValue();    
    
    
    Random generator = new Random();
    Image offScreenImage;
    int width, height;
    int i = 0;
    Thread t = null;
    boolean threadSuspended;
    Font waterFont = new Font("serif", Font.PLAIN, 20);
    

    
    Vector traffic;
    Car staller = null;
    float incidentLoc =0;
    
    boolean mousePressed = false;
    
    sgSlider carPower = new sgSlider("Car Power",0,100,15);
    sgSlider trafficRate = new sgSlider("Traffic Rate",0,40,15);
    
    JPanel display = new JPanel();
    JPanel controls = new JPanel();
    
    public void init() {
        
        System.out.println("Init");
        addMouseListener(this);
        addComponentListener(this);
        
        traffic = new Vector();
        traffic.add(new Car(.15f));
        
        controls.setLayout(new BorderLayout());
        controls.add(carPower,"West");
        controls.add(trafficRate,"East");
        
        getContentPane().add(display,BorderLayout.CENTER);
        getContentPane().add(controls,BorderLayout.SOUTH);
        System.out.println(traffic);

        
    }
    
    public void destroy() {
    }
    
    public void start() {
         System.out.println("Start");  

        if ( t == null ) {
            t = new Thread( this );
            threadSuspended = false;
            t.start();
            
        } else {
            if ( threadSuspended ) {
                threadSuspended = false;
                
                synchronized( this ) {
                    notify();
                }
            }
        }
    }
    
    public void stop() {
        threadSuspended = true;
    }
    
    // Executed within the thread that this applet created.
    public void run() {
        try {
            while (true) {
                
                // Now the thread checks to see if it should suspend itself
                if ( threadSuspended ) {
                    synchronized( this ) {
                        while ( threadSuspended ) {
                            wait();
                        }
                    }
                }
                update(display.getGraphics());
                t.sleep( 1000/30 );  // interval given in milliseconds
            }
        } catch (InterruptedException e) { }
    }
    
    public void paint( Graphics g ) {
        
        
        if (javaVersion < 1.5f) {
            //System.out.println("monkey");
        }
        
        
        
        width = getSize().width;
        height = getSize().height;
        
        Graphics2D g2d = (Graphics2D)g;
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        
        int mid = height/2;
        
        g2d.setPaint(new Color(70,130,60));
        g2d.fill(new Rectangle2D.Double(0, 0,width, height));
        
        //gravel
        g2d.setPaint(new Color(100,100,100));
        g2d.fillRect(0, mid-20,width, 40);
        
        //yellow striping
        g2d.setPaint(new Color(230,230,0));
        g2d.drawRect(0,mid-13,width,26);
        
        //asphalt
        g2d.setPaint(new Color(80,80,80));
        g2d.fill(new Rectangle2D.Double(0,mid-12,width,24));
        
        //striping
        g2d.setPaint(Color.white);
        for (int i =0; i*7 < width; i++){
            g2d.fill(new Rectangle2D.Double(i*7, mid-1,4,2));
        }
        
        //watermark
        g2d.setColor(new Color(1.0f,1.0f,1.0f,.5f));
        g2d.setFont(waterFont);
        //g2d.drawString("screamyGuy.net",width-140,height-10);
        
        //cars
        
        //randomly add cars
        if (generator.nextDouble() < trafficRate.getValue()/100.0f){
            //check for existing backup
            
            if (((Car)traffic.elementAt(traffic.size()-1)).x > 0){
                traffic.add(new Car(carPower.getValue()/100.f));
            }
        }
        
        //draw the lead car

        Car curr = (Car)traffic.elementAt(0);
        curr.draw(null, this, g2d);
        
        //halt one of them
        if (mousePressed){
            if (staller == null){
                staller = (Car)traffic.elementAt(1);
                staller.distracted = true;
                incidentLoc = staller.x;
            } else{
                staller.distracted = true;
            }
            
        } else{
            if (!(staller == null)) staller = null;
        }
        
        //update all of the traffic
        for (int i = 1; i < traffic.size(); i++){
            curr = (Car)traffic.elementAt(i);
            curr.draw((Car)traffic.elementAt(i-1), this,g2d);
        }
        
        //remove offscreen cars
        for (int i = 0; i < traffic.size(); i++){
            curr = (Car)traffic.elementAt(i);
            if (curr.x > width + 30) traffic.remove(i);
        }
        
        if (incidentLoc !=0 ){
            
            g2d.setPaint(new Color(255,255,255,100));
            g2d.fillRect((int)incidentLoc, mid-20,20,40);
            
        }
         
        controls.repaint();

    }
    static public void main(String [] argv){
        
        
        
        Base smonkaroni = new Base();
        JFrame frame = new JFrame("Blarg!");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(smonkaroni);
        frame.setSize(600,200);
        frame.setVisible(true);
        
        smonkaroni.init();
        smonkaroni.start();
  
        frame.setSize(600,200);

        
    }
    
    public void mousePressed(MouseEvent e) {
        mousePressed = true;
    }
    
    public void mouseReleased(MouseEvent e) {
        mousePressed = false;
    }
    
    public void mouseEntered(MouseEvent e) {
        
    }
    
    public void mouseExited(MouseEvent e) {
        
    }
    
    public void mouseClicked(MouseEvent e) {
        
    }
    
    
//perform double buffering manually
    public void update( Graphics g ){
        
        if ( offScreenImage == null){
            offScreenImage = createImage( getSize().width, getSize().height );
        }
        Graphics gOffScreenImage = offScreenImage.getGraphics();
        
        //Now draw on the offscreen image.
        paint( gOffScreenImage );
        g.drawImage(offScreenImage, 0, 0, this);
        gOffScreenImage.dispose();
    }
    
    public void componentResized(ComponentEvent e) {
        offScreenImage = null;
    }
    
    public void componentMoved(ComponentEvent e) {
    }
    
    public void componentShown(ComponentEvent e) {
    }
    
    public void componentHidden(ComponentEvent e) {
    }
    
    
    
}

class Car{
    
    Random generator = new Random();
    float x,y;
    float dx = 6;
    float dx2 = 0;
    float trailing = 25;
    float maxVel = 6.5f;
    float maxAccel = .15f;
    
    boolean distracted = false;
    
    public Car(float maxAccel){
        
        y = 3;
        x = -20;
        
        this.maxAccel = maxAccel;
        
    }
    
    public void draw(Car next, Base can, Graphics2D g){
        
        
        if (distracted) g.setPaint(new Color(255,0,0));
        else g.setPaint(new Color(220,220,250));
        
        g.fillRect((int)x,(int)(y + can.height/2),10,7);
        g.setColor(Color.black);
        g.drawRect((int)x,(int)(y + can.height/2),10,7);
        
        //even though we use P and D, this is not a PD controller!
        //Here, we have access to some variables that are not
        //available in real life.
        if (next != null){
            float P = next.x - trailing - x;
            float D = next.dx - dx;
            
            dx2 =  P/7 + D/8;
            
        }
        
        if (dx2 > maxAccel) dx2 = maxAccel;
        
        dx += dx2;
        
        //cars top speed limited
        if (dx > maxVel) dx = maxVel;
        
        if (distracted){
            dx -= 2;
            distracted = false;
        }
        
        //cars not allowed to reverse
        if (dx < 0) dx = 0;
        
        x += dx;
        
    }
}


class sgSlider extends JPanel{
    
    JLabel label;
    JSlider slider;
    int min,max;
    JPanel area;
    
    public sgSlider(String label, int min, int max, int value){
        this.label = new JLabel(label);
        slider = new JSlider(min,max,value);
        
        add(this.label);
        add(slider);
    }
    
    public int getValue(){
        return slider.getValue();
    }
    
    
    
}