import java.util.concurrent.Executors;

public class HistogramGenerator implements HistogramGeneratorInterface  {

    private static DiceInterface dice;
    private HistogramInterface histogram;
    private int threads;
    int numberOfFaces;


    HistogramGenerator() {

    }

    @Override
    public void setHistogram(HistogramInterface histogram) {
        this.histogram = histogram;
    }

    @Override
    public void setDice(DiceInterface dice) {
        this.dice = dice;
    }

    @Override
    public void setNumberOfThreads(int threads) {
        this.threads = threads;
    }

    @Override
    public void start(int numberOfDraws) {
        histogram.setSize(dice.getNumberOfFaces());
        Threads[] watki = new Threads[threads];

        for(int i=0; i<watki.length; i++) {
            watki[i] = new Threads(dice, histogram, numberOfDraws, dice.getNumberOfFaces());
        }
        try {
            for (int i = 0; i < watki.length; i++) {
                watki[i].t.join();
            }

        }catch (InterruptedException e) {
            System.exit(1);
        }

    }

    public static void main(String args[]) {

    }
}

class Threads extends HistogramGenerator implements Runnable  {
    int wylosowane = 0;
    Thread t;
    private DiceInterface diceInterface;
    private HistogramInterface histogramInterface;
    int numberOfDraws, faces;
    static Object[] uzywaneBiny;
    final Object blokuj = new Object();

    Threads(DiceInterface diceInterface, HistogramInterface histogramInterface, int numberOfDraws, int faces) {
        this.diceInterface = diceInterface;
        this.histogramInterface = histogramInterface;
        this.numberOfDraws = numberOfDraws;
        this.faces = faces;

        uzywaneBiny = new Object[faces];

        for(int i=0; i<faces; i++) {
            uzywaneBiny[i] = new Object();
        }
        t = new Thread(this);
        t.start();
    }

    @Override
    public void run() {

        int draw;
        while(true) {
            //TU BYL LICZNIK
            draw = diceInterface.get();
            synchronized (uzywaneBiny[draw-2]) {
                histogramInterface.increment(draw);
            }
        }
    }
}