package lettergame;

import java.io.*;
import javax.sound.sampled.*;

/**
 * A Recorder takes input from the microphone and saves the audio as a
 * monaural wave file.
 * 
 * @author Kenneth J. Goldman, adapted in part from code by Ming Chow
 * @version 1.0
 */
class Recorder {
	private AudioFileFormat.Type fileType = AudioFileFormat.Type.WAVE;
	private AudioFormat format =
		new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, 44100, 16, 1, 2, 44100, true);
	private TargetDataLine microphone;
	private Thread session;

	/**
	 * Starts recording to the given file.
	 * @param soundFile the new .wav file in which to save the sound clip
	 * @throws IOException when the file cannot not be written
	 * @throws LineUnavailableException when the microphone is not accessible
	 */
	public synchronized void beginRecording(final File soundFile) throws IOException, LineUnavailableException {
		DataLine.Info info = new DataLine.Info(TargetDataLine.class, format);
		if (!AudioSystem.isLineSupported(info))
			throw new IOException("Line type not supported: " + info);
		microphone = (TargetDataLine) AudioSystem.getLine(info);
		microphone.open(format, microphone.getBufferSize());
		session = new Thread() {
			public void run() {
				AudioInputStream sound = new AudioInputStream(microphone);
				microphone.start();
				try {
					AudioSystem.write(sound, fileType, soundFile);
				} catch (IOException e) {
					e.printStackTrace();
					System.out.println(e);
				}
			}
		};
		session.start();
	}

	/**
	 * Terminates the current recording session.
	 */
	public synchronized void endRecording() {
		microphone.stop();
		microphone.close();
		if (session != null) {
		   try {
		       session.join();
		   } catch (InterruptedException e) {
		   }
		   session = null;
		}
		notify();
	}

	/**
	 * Waits until the current recording session, if any, has terminated.
	 */
	public synchronized void waitForEnd() {
		while (session != null)
			try {
				wait();
			} catch (InterruptedException e) {
			}
	}
}