package philosopher3;

import src.Chopstick;

public class Philosopher implements Runnable {
    private final Chopstick leftChopstick;
    private final Chopstick rightChopstick;

    public Philosopher(Chopstick leftChopstick, Chopstick rightChopstick) {
        this.leftChopstick = leftChopstick;
        this.rightChopstick = rightChopstick;
    }

    @Override
    public void run() {
        try {
            while (true) {
                think();
                if (tryToEat()) {
                    eat();
                }
            }
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        }
    }

    private void think() {
        System.out.println(Thread.currentThread().getName() + " is thinking.");
    }

    private boolean tryToEat() throws InterruptedException {
        synchronized (leftChopstick) {
            leftChopstick.pickUp();
            if (!tryPickUpRightChopstick()) {
                leftChopstick.putDown();
                return false;  // Couldn't get both chopsticks, return to thinking
            }
        }
        return true;
    }

    private boolean tryPickUpRightChopstick() throws InterruptedException {
        synchronized (rightChopstick) {
            rightChopstick.pickUp();
            return true;
        }
    }

    private void eat() throws InterruptedException {
        System.out.println(Thread.currentThread().getName() + " is eating.");
        rightChopstick.putDown();
        leftChopstick.putDown();
    }
}