import java.util.concurrent.locks.*;

// Kokk og servit?r
// med Doug Leas concurrent-bibliotek
// Stein Gjessing -> mars 2025, Magnus Skjegstad 2026-

class Restaurant {

    public static void main(String[] args) throws InterruptedException {
        FellesBord fellesBord = new FellesBord();

        final int antallPizzaer = 50;

        Kokk kokkRunP = new Kokk(antallPizzaer, fellesBord);
        Thread kokkTr?d = new Thread(kokkRunP);
        kokkTr?d.start();

        Servit?r servit?rRunP = new Servit?r(antallPizzaer, fellesBord);
        Thread servit?rTr?d = new Thread(servit?rRunP);
        servit?rTr?d.start();

        kokkTr?d.join();
        servit?rTr?d.join();

    }
    
}

class Servit?r implements Runnable {
    private FellesBord fellesBord;
    private int hentet = 0;
    private final int antallPizzaer;

    Servit?r(int antall, FellesBord fellesBord) {
        this.fellesBord = fellesBord;
        this.antallPizzaer = antall;
    }

    @Override
    public void run() {
        while(this.hentet < this.antallPizzaer) {
            try {
                this.fellesBord.hentPizza();
                this.hentet = this.hentet + 1;
                System.out.println("Servit?r hentet pizza " + this.hentet);
                Thread.sleep((int)(Math.random() * 1000));
            } catch (InterruptedException ex) {
                break;
            }
        }
        System.out.println("Servit?ren er ferdig");
    }
}

class Kokk implements Runnable {
    private FellesBord fellesBord;
    private int antallPizzaer;
    private int laget = 0;

    Kokk(int antallPizzaer, FellesBord fellesBord) {
        this.fellesBord = fellesBord;
        this.antallPizzaer = antallPizzaer;
    }

    @Override
    public void run() {
        while(this.laget < this.antallPizzaer) {
            this.laget = this.laget + 1;
            System.out.println("Kokken setter ut pizza " + this.laget);
            try {
                this.fellesBord.settUtPizza();   
                Thread.sleep((int)(Math.random() * 500));
            } catch (InterruptedException ex) {
                break;
            }
        }
        System.out.println("Kokken er ferdig");
    }
}

class FellesBord {
    private final int KAPASITET = 5;
    private int antallPizzaer = 0;
    private Lock l?s = new ReentrantLock();
    private Condition ikkeTomt = l?s.newCondition();
    private Condition ikkeFullt = l?s.newCondition();

    public void hentPizza() throws InterruptedException {
        l?s.lock();
        try {
            while (antallPizzaer == 0) {
                System.out.println("Bordet er tomt! Venter p? flere pizzaer...");
                ikkeTomt.await();
            }
            antallPizzaer = antallPizzaer - 1;
            ikkeFullt.signalAll();
        }finally {
            l?s.unlock();
        }
        
    }

    public void settUtPizza() throws InterruptedException {
        l?s.lock();
        try {
            while (antallPizzaer >= KAPASITET) {
                System.out.println("Bordet er fullt! Venter p? servit?r...");
                ikkeFullt.await();
            }
            antallPizzaer = antallPizzaer + 1;
            ikkeTomt.signalAll();
        } finally {
            l?s.unlock();
        }
    }
}