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

class Brusautomat{
  private final int kapasitet;
  private int antBrusbokser;
  private int antBrusdrikkere;

  private final Lock laas = new ReentrantLock();
  private final Condition tom = laas.newCondition();
  private final Condition ikkeTom = laas.newCondition();

  public Brusautomat(int kapasitet, int Brusdrikkere){

    this.kapasitet = kapasitet;
    this.antBrusbokser = kapasitet;
    this.antBrusdrikkere = antBrusdrikkere;
  }

  public void refill() throws InterruptedException{
    
    laas.lock();
    try {

      while (antBrusbokser > 0) {
        if (antBrusdrikkere == 0) return;
        tom.await();
      }

      this.antBrusbokser = kapasitet;

      ikkeTom.signalAll();
      System.out.println("Brusautomaten er fylt opp!");

    }
    finally { laas.unlock(); }
  }
  
  public void kjopBrus() throws InterruptedException {
    laas.lock();
    try {
        while (antBrusbokser == 0) {
          ikkeTom.await();
        }

        antBrusbokser--;
        System.out.println("En brus ble kj?pt");

        if (antBrusbokser == 0) {tom.signal();}


    } finally {
      laas.unlock();
    }
}

  public boolean finnesFlereBrusdrikkere(){
    laas.lock();
    try {
      return antBrusdrikkere > 0;
    } finally {
      laas.unlock();
    }
  }

  public void ferdigAaDrikke(){
    laas.lock();
    try {
      antBrusdrikkere--;
      if (antBrusdrikkere == 0) {tom.signalAll();}
    } finally {laas.unlock();}
  }

}