package class8_2_MultithreadPrimeApp;

import javax.swing.*;
import java.awt.*;

public class PrimeApp extends JFrame {

    private PrimeFinder primeFinder = new PrimeFinder(this);

    private final JLabel recentPrimeLabel;
    private Thread worker;

    public static void main(String[] ignored) {
        new PrimeApp();
    }

    public PrimeApp() {

        setSize(400, 300);
        setLayout(new FlowLayout());
        setDefaultCloseOperation(EXIT_ON_CLOSE);

        //--- The main window ---
        recentPrimeLabel = new JLabel();
        recentPrimeLabel.setText("Latest prime: (none)");
        add(recentPrimeLabel);

        JButton button = new JButton("Find Primes");
        button.addActionListener(l->startPrimes());
        add(button);

        //--- The menu bar ---
        JMenuBar bar = new JMenuBar();
        JMenu menu = new JMenu("Actions");

        JMenuItem item = new JMenuItem("Start finding primes");
        item.addActionListener(l->startPrimes());
        menu.add(item);

        item = new JMenuItem("Stop finding primes");
        item.addActionListener(l->stopPrimes());
        menu.add(item);

        bar.add(menu);
        setJMenuBar(bar);

        setVisible(true);
    }

    public void startPrimes() {
        primeFinder.findPrimes();
    }

    public void stopPrimes() {
        System.out.println("Interrupting worker.");
        worker.interrupt();
    }

    /**
     * Sets the most recently found prime text. Client must provide the "Latest prime:" prefix as well.
     * @param text The complete new text for the label.
     */
    public void setRecentPrime(String text) {
        SwingUtilities.invokeLater(() ->
                recentPrimeLabel.setText(text));
    }
}