import java.net.*;
import java.io.*;
import java.util.Scanner;
/**
 * A binary counter showing the bits for a numner 0 to 15 
 * for 4 LEDs at pin 6 using software Pulse Width Modulation (Soft PWD).
 * 
 * This class controls the PWM LED programatically.
 * 
 */
public class Counter implements ButtonListener
{
    // The Adjustable LED
    private pwmLED[] leds; 
    private Button button;
    
    /**
     * Constructor for objects of class Controller.
     */
    public Counter()
    {
        // initialise instance variables
        leds   = new pwmLED[4];
        leds[0] = new pwmLED(25);//wPi25 is BCM 26 phys 37
        leds[1] = new pwmLED(23);//wPi23 is BCM 13 phys 33
        leds[2] = new pwmLED(29);//wPi29 is BCM 21 phys 40
        leds[3] = new pwmLED(27);//wPi27 is BCM 16 phys 36
        button = new Button(7);       // Create the Button at pin 7 controlled by this
        button.addListener(this);     // Make the button tell us when it has changed (See buttonChanged() below)
        
    }

    public void allOn()
    {
        for (int i=0 ; i<4 ; i++){
           
            leds[i].on();
        }
    }
    public void shutdown()
    {
            allOff();
            button.removeAllListeners();
     }
    public void allOff()
    {
        for (int i=0 ; i<4 ; i++){
            
            leds[i].off();
        }
    }

    /**
     * This method should set the LED to full brightness.
     * (Exercise 3.2)
     * 
     */
    public void setLedBrightness(int index, int value)
    {
        leds[index].setValue(value);
    }

    public void leftShift()
    {
        leds[3].setValue(leds[2].getValue() );
        leds[2].setValue(leds[1].getValue() );
        leds[1].setValue(leds[0].getValue() );
        leds[0].setValue(0);          
    }

    public void rightShift()
    {
        leds[0].setValue(leds[1].getValue() );
        leds[1].setValue(leds[2].getValue() );
        leds[2].setValue(leds[3].getValue() );
        leds[3].setValue(0);           
    }

    public void setValue(int v)
    {

        if (v >= 0 && v<16)
        {
            allOff();
            if (v-8 >= 0){
                leds[3].on();
                v -= 8;
            }
            if (v -4 >=0){
                leds[2].on();
                v -= 4;
            }
            if (v - 2 >= 0){
                leds[1].on();
                v -= 2;
            }
            if (v == 1)
                leds[0].on();
           
        }
    }

    public int getValue()
    {
        int result = 0;
        for (int i=0; i<4; i++)
            if (leds[i].isOn() ) 
                result += Math.pow(2,i);
        return result;
    }
    public void addOne()
    {
         if (getValue() >= 15){ // is this overflow?
             allOff();
             //overflow
             return;
         }
         if (! leds[0].isOn() ){ // if even just turn on the last bit
             leds[0].on();
             return;
         }
         // otherwise it is odd, so need to carry the ones place
         leds[0].off();
         if (! leds[1].isOn() ){
             leds[1].on();
             return;
         }
         // already on, so carry the next digit
         leds[1].off();
         if( ! leds[2].isOn() ){
             leds[2].on();
             return;
         }
         // already on, so carry the next digit
         leds[2].off();
         if (! leds[3].isOn() ){
             leds[3].on();
             return;
         }
         return;   
    }
    public void buttonChanged(boolean isPressed)
    {
        if(!isPressed) {
            addOne();
            //try {Thread.sleep(100);} catch(Exception e) {}
            System.out.println(getValue() );
        }
    }
    public static void main(String[] args)
    {
           System.out.println("Count in binary\nPress black button to count, Type <ENTER> to quit");
           Counter c = new Counter();
           Scanner kb = new Scanner(System.in);
           kb.nextLine();
           c.shutdown();
           
           c =null;  // otherwise, the count and its LEDs continue to function.
           System.out.println("That's All Folks...");
    }
}