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

public class Bord {
    Lock laas = new ReentrantLock();
    Condition ikkeTom = laas.newCondition();
    ArrayList<Barista> baristaer = new ArrayList<>();
    int antBaristaer;
    boolean ferdigServert = false;

    public Bord(int ant){
        antBaristaer = ant;
    }

    //settInn metode
    public void serverKaffe(Barista barista, boolean ferdig){
        laas.lock();
        try{
            //System.out.println("\nbaristaer.size i serverKaffe(): " + baristaer.size());
            //System.out.println("serverer");
            baristaer.add(barista);
            //System.out.println("lagt til");
            //System.out.println("ferdig i serverKaffe(): " + ferdig);
            
            ikkeTom.signalAll();
            //System.out.println("signalisert");
        } finally{
            laas.unlock();
        }
    }

    public Barista hentKaffe() throws InterruptedException {
        laas.lock();
        try{
            //System.out.println("\nhentKaffe(), ferdigServert: " + ferdigServert);
            //System.out.println("baristaer.size i hentKaffe(): " + baristaer.size());
            //System.out.println("antBaristaer: " + antBaristaer);

            while(baristaer.size() == 0 && !ferdigServert){
                //System.out.println("ikketom.await");
                //System.out.println("antBaristaer: " + antBaristaer);
                ikkeTom.await();
            }

            if(antBaristaer == 0 || ferdigServert){
                //System.out.println("return null");
                return null;
            }

            if(baristaer.size() > 0){
                //System.out.println("returnerer kaffe");
                return baristaer.remove(0);
            }
        } finally{
            laas.unlock();
        }
        return null;
    }

    public void signaliser(){
        laas.lock();
        try{
            //System.out.println("\nsignaliserer - signaliser()");
            antBaristaer--;

            //System.out.println("antBaristaer i signaliser(): " + antBaristaer);

            if(antBaristaer == 0){
                ferdigServert = true;
                System.out.println("\nFERDIG");
            }

            ikkeTom.signalAll();
        } finally{
            laas.unlock();
        }
    }
}