package bradleyross.sound;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import java.text.DecimalFormat;
import java.io.IOException;
//import javax.sound.sampled.*;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.Clip;
import javax.sound.sampled.FloatControl;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;

import java.io.ByteArrayInputStream;
/** Beeper presents a small, loopable tone that can be heard
by clicking on the Code Key.  It uses a Clip to loop the sound,
as well as for access to the Clip's gain control.
 * <p> See
 *    <a href="http://stackoverflow.com/questions/7782721/java-raw-audio-output/7782749#7782749"
 *    target="_blank">
 *    http://stackoverflow.com/questions/7782721/java-raw-audio-output/7782749#7782749
 *    </a>
 *    </p>
 * <p>This runs when triggered  from the command line.  It may or may not run when triggered
 *    from within Eclipse.</p>
 * <p>It appears that this was based on an older library that did not contain clip.getControl.</p>
 * @author Andrew Thompson
 * @version 2009-12-19
 * <p>license LGPL</p> 
 * @see javax.sound.sampled.AudioSystem
 * @see AudioFormat
 * @see AudioInputStream
 * 
 * @see LineUnavailableException
 * @see UnsupportedAudioFileException
 */
@SuppressWarnings("serial")
public class Beeper extends JApplet {

        BeeperPanel bp;

        public void init() {
                bp = new BeeperPanel();
                getContentPane().add(bp);
                validate();

                String sampleRate = getParameter("samplerate");
                if (sampleRate!=null) {
                        try {
                                int sR = Integer.parseInt(sampleRate);
                                bp.setSampleRate(sR);
                        } catch(NumberFormatException useDefault) {
                        }
                }

                String fpw = getParameter("fpw");
                if (fpw!=null) {
                        try {
                                int fPW = Integer.parseInt(fpw);
                                JSlider slider = bp.getFramesPerWavelengthSlider();
                                slider.setValue( fPW );
                        } catch(NumberFormatException useDefault) {
                        }
                }

                boolean harmonic = (getParameter("addharmonic")!=null);
                bp.setAddHarmonic(harmonic);

                bp.setUpSound();

                if ( getParameter("autoloop")!=null ) {
                        String loopcount = getParameter("loopcount");
                        if (loopcount!=null) {
                                try {
                                        Integer lC = Integer.parseInt(loopcount);
                                        bp.loop( lC.intValue() );
                                } catch(NumberFormatException doNotLoop) {
                                }
                        }
                }
        }

        public void stop() {
                bp.loopSound(false);
        }

        public static void main(String[] args) {
                SwingUtilities.invokeLater(new Runnable() {
                        public void run() {
                                JFrame f = new JFrame("Beeper");
                                f.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
                                BeeperPanel BeeperPanel = new BeeperPanel();
                                f.setContentPane(BeeperPanel);
                                f.pack();
                                f.setMinimumSize( f.getSize() );
                                f.setLocationByPlatform(true);
                                f.setVisible(true);
                        }
                });
        }
}

/** The main UI of Beeper. */
@SuppressWarnings("serial")
class BeeperPanel extends JPanel {

        JComboBox<Integer> sampleRate;
        JSlider framesPerWavelength;
        JLabel frequency;
        JCheckBox harmonic;
        Clip clip;

        DecimalFormat decimalFormat = new DecimalFormat("###00.00");
        /**
         * Build panel for controlling tone generation.
         * 
         * It is not safe to set the volume on the audio device here 
         * because many systems only only the controls to be used when
         * the line is open.
         * 
         * @see FloatControl
         */
        BeeperPanel() {
                super(new BorderLayout());
                // Use current OS look and feel.
                try {
                        UIManager.setLookAndFeel(
                                        UIManager.getSystemLookAndFeelClassName());
                        SwingUtilities.updateComponentTreeUI(this);
                } catch (Exception e) {
                        e.printStackTrace();
                }
                setPreferredSize( new Dimension(300,300) );

                JPanel options = new JPanel();
                BoxLayout bl = new BoxLayout(options,BoxLayout.Y_AXIS);
                options.setLayout(bl);

                Integer[] rates = {
                                new Integer(8000),
                                new Integer(11025),
                                new Integer(16000),
                                new Integer(22050)
                };
                sampleRate = new JComboBox<Integer>(rates);
                sampleRate.setToolTipText("Samples per second");
                sampleRate.setSelectedIndex(1);
                JPanel pSampleRate = new JPanel(new BorderLayout());
                pSampleRate.setBorder(new TitledBorder("Sample Rate"));
                pSampleRate.add( sampleRate );
                sampleRate.addActionListener(new ActionListener() {
                        public void actionPerformed(ActionEvent ae) {
                                setUpSound();
                        }
                });
                options.add( pSampleRate );

                framesPerWavelength = new JSlider(JSlider.HORIZONTAL,10,200,25);
                framesPerWavelength.setPaintTicks(true);
                framesPerWavelength.setMajorTickSpacing(10);
                framesPerWavelength.setMinorTickSpacing(5);
                framesPerWavelength.setToolTipText("Frames per Wavelength");
                framesPerWavelength.addChangeListener( new ChangeListener(){
                        public void stateChanged(ChangeEvent ce) {
                                setUpSound();
                        }
                } );

                JPanel pFPW = new JPanel( new BorderLayout() );
                pFPW.setBorder(new TitledBorder("Frames per Wavelength"));

                pFPW.add( framesPerWavelength );
                options.add( pFPW );

                JPanel bottomOption = new JPanel( new BorderLayout(4,4) );
                harmonic = new JCheckBox("Add Harmonic", false);
                harmonic.setToolTipText(
                                "Add harmonic to second channel, one octave up");
                harmonic.addActionListener( new ActionListener(){
                        public void actionPerformed(ActionEvent ae) {
                                setUpSound();
                        }
                } );
                bottomOption.add( harmonic, BorderLayout.WEST );

                frequency = new JLabel();
                bottomOption.add( frequency, BorderLayout.CENTER );

                options.add(bottomOption);

                add( options, BorderLayout.NORTH );

                JPanel play = new JPanel(new BorderLayout(3,3));
                play.setBorder( new EmptyBorder(4,4,4,4) );
                JButton bPlay  = new JButton("Code Key");
                bPlay.setToolTipText("Click to make tone!");
                Dimension preferredSize = bPlay.getPreferredSize();
                bPlay.setPreferredSize( new Dimension(
                                (int)preferredSize.getWidth(),
                                (int)preferredSize.getHeight()*3) );

                // TODO comment out to try KeyListener!
                //bPlay.setFocusable(false);
                bPlay.addKeyListener( new KeyAdapter(){
                        @Override
                        public void keyPressed(KeyEvent ke) {
                                loopSound(true);
                        }
                } );
                bPlay.addMouseListener( new MouseAdapter() {
                        @Override
                        public void mousePressed(MouseEvent me) {
                                loopSound(true);
                        }

                        @Override
                        public void mouseReleased(MouseEvent me) {
                                loopSound(false);
                        }
                } );
                play.add( bPlay );
                /*
                 * There are multiple types of controls that can be supported 
                 * here.  Two of them are VOLUME and MASTER_GAIN.  None, one,
                 * or both of these may be supported by a given audio line.
                 * 
                 * The code previously did not check for support and assumed 
                 * support of MASTER_GAIN.  I changed the code to check
                 * for support of  both MASTER_GAIN and VOLUME.
                 */
                try {
                                clip = AudioSystem.getClip();

                } catch (LineUnavailableException e) {
                        e.printStackTrace();
                        clip = null;
                }
                if ( clip != null && clip.isControlSupported(FloatControl.Type.MASTER_GAIN))
                {
                        try {
                
                                final FloatControl control = (FloatControl)
                                                clip.getControl( FloatControl.Type.MASTER_GAIN );


                                final JSlider volume = new JSlider(
                                                JSlider.VERTICAL,
                                                (int)control.getMinimum(),
                                                (int)control.getMaximum(),
                                                (int)control.getValue()
                                                );
                                volume.setToolTipText("Volume of beep");
                                volume.addChangeListener( new ChangeListener(){
                                        public void stateChanged(ChangeEvent ce) {
                                                control.setValue( volume.getValue() );
                                        }
                                } );
                                play.add( volume, BorderLayout.EAST );
                        } catch(Exception e) {
                                e.printStackTrace();
                        }
                } else {
                        System.out.println("MASTER_GAIN not available");
                }
                /*
                 * Controls not supported at this point because clip is not open.
                 * This apparently varies between systems.
                 */

                if (clip != null && clip.isControlSupported(FloatControl.Type.VOLUME))
                {
                        try {
                                clip = AudioSystem.getClip();
                                final FloatControl control = (FloatControl)
                                                clip.getControl( FloatControl.Type.VOLUME);


                                final JSlider volume = new JSlider(
                                                JSlider.VERTICAL,
                                                (int)control.getMinimum(),
                                                (int)control.getMaximum(),
                                                (int)control.getValue()
                                                );
                                volume.setToolTipText("Volume of beep");
                                volume.addChangeListener( new ChangeListener(){
                                        public void stateChanged(ChangeEvent ce) {
                                                control.setValue( volume.getValue() );
                                        }
                                } );
                                play.add( volume, BorderLayout.EAST );
                        } catch(Exception e) {
                                e.printStackTrace();
                        }
                }       else {
                        System.out.println("VOLUME not available");
                }
                if (clip != null && clip.isControlSupported(FloatControl.Type.AUX_RETURN)) {
                        System.out.println("AUX_RETURN control is supported");
                } else {
                        System.out.println("AUX_RETURN control is not supported");
                }
                if (clip != null && clip.isControlSupported(FloatControl.Type.AUX_SEND)) {
                        System.out.println("AUX_SEND control is supported");
                } else {
                        System.out.println("AUX_SEND control is not supported");
                }
                if (clip != null && clip.isControlSupported(FloatControl.Type.BALANCE)) {
                        System.out.println("BALANCE control is supported");
                } else {
                        System.out.println("BALANCE control is not supported");
                }
                add(play, BorderLayout.CENTER);

                setUpSound();
        }

        public void loop(int loopcount) {
                if (clip!=null) {
                        clip.loop( loopcount );
                }
        }

        public void setAddHarmonic(boolean addHarmonic) {
                harmonic.setSelected(addHarmonic);
        }

        /** Provides the slider for determining the # of frames per wavelength,
    primarily to allow easy adjustment by host classes. */
        public JSlider getFramesPerWavelengthSlider() {
                return framesPerWavelength;
        }

        /** Sets the sample rate to one of the four
    allowable rates. Is ignored otherwise. */
        public void setSampleRate(int sR) {
                switch (sR) {
                case 8000:
                        sampleRate.setSelectedIndex(0);
                        break;
                case 11025:
                        sampleRate.setSelectedIndex(1);
                        break;
                case 16000:
                        sampleRate.setSelectedIndex(2);
                        break;
                case 22050:
                        sampleRate.setSelectedIndex(3);
                        break;
                default:
                }
        }

        /** Sets label to current frequency settings. */
        public void setFrequencyLabel() {
                float freq = getFrequency();
                if (harmonic.isSelected()) {
                        frequency.setText(
                                        decimalFormat.format(freq) +
                                        "(/" +
                                        decimalFormat.format(freq*2f) +
                                        ") Hz" );
                } else {
                        frequency.setText( decimalFormat.format(freq) + " Hz" );
                }
        }

        /** Generate the tone and inform the user of settings. */
        public void setUpSound() {
                try {
                        generateTone();
                        setFrequencyLabel();
                } catch(Exception e) {
                        e.printStackTrace();
                }
        }

        /** Provides the frequency at current settings for
    sample rate & frames per wavelength. */
        public float getFrequency() {
                Integer sR = (Integer)sampleRate.getSelectedItem();
                int intST = sR.intValue();
                int intFPW = framesPerWavelength.getValue();

                return (float)intST/(float)intFPW;
        }

        /** Loops the current Clip until a commence false is passed. */
        public void loopSound(boolean commence) {
                if ( commence ) {
                        clip.setFramePosition(0);
                        clip.loop( Clip.LOOP_CONTINUOUSLY );
                } else {
                        clip.stop();
                }
        }

        /** Generates a tone, and assigns it to the Clip. 
         * @see AudioSystem
         */
        public void generateTone()
                        throws LineUnavailableException {
                if ( clip!=null ) {
                        clip.stop();
                        clip.close();
                } else {
                        clip = AudioSystem.getClip();
                }
                boolean addHarmonic = harmonic.isSelected();

                int intSR = ((Integer)sampleRate.getSelectedItem()).intValue();
                int intFPW = framesPerWavelength.getValue();

                float sampleRate = (float)intSR;

                // oddly, the sound does not loop well for less than
                // around 5 or so, wavelengths
                int wavelengths = 20;
                byte[] buf = new byte[2*intFPW*wavelengths];
                AudioFormat af = new AudioFormat(
                                sampleRate,
                                8,  // sample size in bits
                                2,  // channels
                                true,  // signed
                                false  // bigendian
                                );

                // int maxVol = 127;
                for(int i=0; i<intFPW*wavelengths; i++){
                        double angle = ((float)(i*2)/((float)intFPW))*(Math.PI);
                        buf[i*2]=getByteValue(angle);
                        if(addHarmonic) {
                                buf[(i*2)+1]=getByteValue(2*angle);
                        } else {
                                buf[(i*2)+1] = buf[i*2];
                        }
                }

                try {
                        byte[] b = buf;
                        AudioInputStream ais = new AudioInputStream(
                                        new ByteArrayInputStream(b),
                                        af,
                                        buf.length/2 );

                        clip.open( ais );
                        System.out.println("Clip opened in generateTone");
                        System.out.println("VOLUME: " + clip.isControlSupported(FloatControl.Type.VOLUME));
                        System.out.println("MASTER_GAIN: " + clip.isControlSupported(FloatControl.Type.MASTER_GAIN));
                        if (clip.isControlSupported(FloatControl.Type.MASTER_GAIN)) {
                                FloatControl gain =  (FloatControl) clip.getControl(FloatControl.Type.MASTER_GAIN);
                                System.out.println("Min. Gain: " + Float.toString(gain.getMinimum()));
                                System.out.println("Max Gain: " + Float.toString(gain.getMaximum()));
                        }
                        System.out.println("AUX_RETURN: " + clip.isControlSupported(FloatControl.Type.AUX_RETURN));
                        System.out.println("AUX_SEND: " + clip.isControlSupported(FloatControl.Type.AUX_SEND));
                } catch(IOException e) {
                        e.printStackTrace();
                }
        }

        /** Provides the byte value for this point in the sinusoidal wave. */
        private static byte getByteValue(double angle) {
                int maxVol = 127;
                return (new Integer(
                                (int)Math.round(
                                                Math.sin(angle)*maxVol))).
                                                byteValue();
        }
}