package jogamp.opengl.util.av;

import java.nio.ByteBuffer;
import java.util.Arrays;

import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.SourceDataLine;

import com.jogamp.opengl.util.av.AudioSink;

/***
 * JavaSound Audio Sink
 * <p>
 * FIXME: Parameterize .. all configs .. best via an init-method, passing requested
 * audio capabilities
 * </p>
 */
public class JavaSoundAudioSink implements AudioSink {

    // Chunk of audio processed at one time
    public static final int BUFFER_SIZE = 1000;
    public static final int SAMPLES_PER_BUFFER = BUFFER_SIZE / 2;
    private static final boolean staticAvailable;
    
    // Sample time values
    // public static final double SAMPLE_TIME_IN_SECS = 1.0 / DEFAULT_SAMPLE_RATE;
    // public static final double BUFFER_TIME_IN_SECS = SAMPLE_TIME_IN_SECS * SAMPLES_PER_BUFFER;
    
    private javax.sound.sampled.AudioFormat format;
    private DataLine.Info info;
    private SourceDataLine auline;
    private int bufferCount;
    private byte [] sampleData = new byte[BUFFER_SIZE];  
    private boolean initialized = false;
    private AudioDataFormat chosenFormat = null;
    
    private volatile boolean playRequested = false;
    
    static {
        boolean ok = false;
        try {
            AudioSystem.getAudioFileTypes();
            ok = true;
        } catch (Throwable t) {
            
        }
        staticAvailable=ok;
    }   
    
    @Override
    public String toString() {
        return "JavaSoundSink[init "+initialized+", dataLine "+info+", source "+auline+", bufferCount "+bufferCount+
               ", chosen "+chosenFormat+", jsFormat "+format;
    }
    
    @Override
    public final float getPlaySpeed() { return 1.0f; } // FIXME
    
    @Override
    public final boolean setPlaySpeed(float rate) { 
        return false; // FIXME 
    }
    
    @Override
    public AudioDataFormat getPreferredFormat() {
        return DefaultFormat;
    }
    
    @Override
    public AudioDataFormat init(AudioDataFormat requestedFormat, float frameDuration, int initialQueueSize, int queueGrowAmount, int queueLimit) {
        if( !staticAvailable ) {
            return null;
        }
        // Create the audio format we wish to use
        format = new javax.sound.sampled.AudioFormat(requestedFormat.sampleRate, requestedFormat.sampleSize, requestedFormat.channelCount, requestedFormat.signed, !requestedFormat.littleEndian);

        // Create dataline info object describing line format
        info = new DataLine.Info(SourceDataLine.class, format);

        // Clear buffer initially
        Arrays.fill(sampleData, (byte) 0);
        try{
            // Get line to write data to
            auline = (SourceDataLine) AudioSystem.getLine(info);
            auline.open(format);
            auline.start();
            System.out.println("JavaSound audio sink");
            initialized=true;
            chosenFormat = requestedFormat;
        } catch (Exception e) {
            initialized=false;
        }
        return chosenFormat;
    }
    
    @Override
    public boolean isPlaying() {
        return playRequested && auline.isRunning();
    }
    
    @Override
    public void play() {
        if( null != auline ) {
            playRequested = true;
            playImpl();
        }
    }
    private void playImpl() {
        if( playRequested && !auline.isRunning() ) {
            auline.start();
        }
    }
    
    @Override
    public void pause() {
        if( null != auline ) {
            playRequested = false;
            auline.stop();
        }
    }
    
    @Override
    public void flush() {        
        if( null != auline ) {
            playRequested = false;
            auline.stop();
            auline.flush();
        }
    }

    @Override
    public final int getEnqueuedFrameCount() {
        return 0; // FIXME
    }
    
    @Override
    public int getFrameCount() {
        return 1;
    }
    
    @Override
    public int getQueuedFrameCount() {
        return 0;
    }
    
    @Override
    public boolean isInitialized() {
        return initialized;
    }

    @Override
    public void destroy() {
        initialized = false;
        chosenFormat = null;
        // FIXEM: complete code!
    }
    
    @Override
    public AudioFrame enqueueData(AudioDataFrame audioDataFrame) {
        int byteSize = audioDataFrame.getByteSize();
        final ByteBuffer byteBuffer = audioDataFrame.getData();
        final byte[] bytes = new byte[byteSize];
        final int p = byteBuffer.position();
        byteBuffer.get(bytes, 0, byteSize);
        byteBuffer.position(p);
        
        int written = 0;
        int len;
        while (byteSize > 0) {
            len = auline.write(bytes, written, byteSize);
            byteSize -= len;
            written += len;
        }
        playImpl();
        return audioDataFrame;
    }

    @Override
    public AudioFrame enqueueData(int pts, ByteBuffer bytes, int byteCount) {
        return enqueueData(new AudioDataFrame(pts, chosenFormat.getBytesDuration(byteCount), bytes, byteCount));
    }    
    
    @Override
    public int getQueuedByteCount() {
        return auline.getBufferSize() - auline.available();
    }
    
    @Override
    public int getFreeFrameCount() {
        return auline.available();
    }
    
    @Override
    public int getQueuedTime() {
        return getQueuedTimeImpl( getQueuedByteCount() );
    }
    private final int getQueuedTimeImpl(int byteCount) {
        final int bytesPerSample = chosenFormat.sampleSize >>> 3; // /8
        return byteCount / ( chosenFormat.channelCount * bytesPerSample * ( chosenFormat.sampleRate / 1000 ) );        
    }

    @Override
    public final int getPTS() { return 0; } // FIXME        
}