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

public class BardiskMonitor {
    private final Lock lock = new ReentrantLock();

    private Condition erIkkeFull = lock.newCondition();
    private Condition erIkkeTom = lock.newCondition();

    private Leveranse[] leveranser = new Leveranse[10];
    private int leveranseTeller = 0;

    private int antRetter;
    private int antRetterFerdig = 0;

    public BardiskMonitor(int antKokker){
        this.antRetter = antKokker * 10;
    }

    public void settFram(Leveranse l) {
        lock.lock();
        try{

            // Endret fra if til while. Når du bruker .signal() funker if,
            // når du bruker signalAll() må du bruke while slik at 
            while(leveranseTeller >= leveranser.length){
                erIkkeFull.await();
            }
            
            antRetterFerdig++;
            leveranser[leveranseTeller] = l;
            leveranseTeller++;
            erIkkeTom.signalAll();
            
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    public Leveranse leverLeveranse(){
        Leveranse hentet = null;
        lock.lock();
        try{
            while(leveranseTeller <= 0) {
                if(erFerdig()) return null;
                erIkkeTom.await();
            }

            leveranseTeller--;
            hentet = leveranser[leveranseTeller];
            erIkkeFull.signalAll();

        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
        return hentet;
    }

    public boolean erFerdig() {
        Boolean erTom = leveranseTeller == 0;
        Boolean kokkeneErFerdig = antRetter == antRetterFerdig; //todo

        // System.out.println(antRetter + " " + antRetterFerdig);
        return erTom && kokkeneErFerdig;
    }
}