package lt.bit.laikas;

import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;
import javax.swing.*;
import java.awt.*;

public class Vykdymas {
    public static float SAMPLE_RATE = 8000f;
    public static void tone(int hz, int msecs, double vol)
            throws LineUnavailableException
    {
        byte[] buf = new byte[1];
        AudioFormat af =
                new AudioFormat(
                        SAMPLE_RATE, // sampleRate
                        8,           // sampleSizeInBits
                        1,           // channels
                        true,        // signed
                        false);      // bigEndian
        SourceDataLine sdl = AudioSystem.getSourceDataLine(af);
        sdl.open(af);
        sdl.start();
        for (int i=0; i < msecs*8; i++) {
            double angle = i / (SAMPLE_RATE / hz) * 2.0 * Math.PI;
            buf[0] = (byte)(Math.sin(angle) * 127.0 * vol);
            sdl.write(buf,0,1);
        }
        sdl.drain();
        sdl.stop();
        sdl.close();
    }

    public static void main(String[] args) {

        JFrame f=new JFrame("Chronometras");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(600,400);
        f.setLocationRelativeTo(null);
        JPanel p=new JPanel();


        JButton start=new JButton("Start");
        JButton pause=new JButton("Pause/Resume");
        JButton reset=new JButton("Reset");
        JLabel  out=new JLabel("0.0", SwingConstants.CENTER);
        out.setFont(new Font("Serif", Font.BOLD, 64));

        Laikas l=new Laikas(out);
        l.start();
        start.addActionListener((e)->{
            l.setRunning(true);
            try {
                tone(300,2000,0.5);
            } catch (LineUnavailableException ex) {
                ex.printStackTrace();
            }
        });
        pause.addActionListener((e)->{
            l.setRunning( ! l.isRunning()  );
        });
        reset.addActionListener((e)->{
            l.reset();

        });

        p.add(start);
        p.add(pause);
        p.add(reset);
        f.add(out, BorderLayout.CENTER);
        f.add(p, BorderLayout.PAGE_END);
        f.setVisible(true);


    }
}