import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.Condition;

class BrusMaskin {
  private final Lock brusLaas = new ReentrantLock();
  private final Condition harBrusAaKjope = brusLaas.newCondition();
  private final Condition trengerPaafyll = brusLaas.newCondition();
  private int kapasitet;
  private int antBrus;

  public BrusMaskin(int k){
    kapasitet = k;
    antBrus = 0;
  }

  public void kjopBrus(){
    brusLaas.lock();
    try {
      while(antBrus == 0){
        harBrusAaKjope.await();
      }
      antBrus--;
      System.out.println("Kjoper brus, ant naa: " + antBrus);

      if (antBrus == 0){
        trengerPaafyll.signal();
      }
    } catch(InterruptedException e){
      System.out.println("Ble forstyrret naar vi kjopte brus.");
    } finally {
      brusLaas.unlock();
    }
  }
  public void fyllBrus(){
    brusLaas.lock();
    try {
      while (antBrus > 0){
        trengerPaafyll.await();
      }
      antBrus = kapasitet;
      System.out.println("Fyller opp brus, ant naa: " + antBrus);

      harBrusAaKjope.signalAll();
    } catch(InterruptedException e){
      System.out.println("Ble forstyrret under paafyll.");
    } finally {
      brusLaas.unlock();
    }
  }
}