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/*
    This file is part of Peers, a java SIP softphone.

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see .
    
    Copyright 2010, 2011, 2012 Yohann Martineau 
*/

package net.sourceforge.peers.javaxsound;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;
import javax.sound.sampled.TargetDataLine;

import net.sourceforge.peers.Logger;
import net.sourceforge.peers.media.AbstractSoundManager;
import net.sourceforge.peers.sip.Utils;

public class JavaxSoundManager extends AbstractSoundManager {

    private AudioFormat audioFormat;
    private TargetDataLine targetDataLine;
    private SourceDataLine sourceDataLine;
    private Object sourceDataLineMutex;
    private DataLine.Info targetInfo;
    private DataLine.Info sourceInfo;
    private FileOutputStream microphoneOutput;
    private FileOutputStream speakerInput;
    private boolean mediaDebug;
    private Logger logger;
    private String peersHome;
    
    public JavaxSoundManager(boolean mediaDebug, Logger logger, String peersHome) {
    	super();
        this.mediaDebug = mediaDebug;
        this.logger = logger;
        this.peersHome = peersHome;
        if (peersHome == null) {
            this.peersHome = Utils.DEFAULT_PEERS_HOME;
        }
        // linear PCM 8kHz, 16 bits signed, mono-channel, little endian
        audioFormat = new AudioFormat(8000, 16, 1, true, false);
        targetInfo = new DataLine.Info(TargetDataLine.class, audioFormat);
        sourceInfo = new DataLine.Info(SourceDataLine.class, audioFormat);
        sourceDataLineMutex = new Object();
    }

    @Override
    public void init() {
        logger.debug("openAndStartLines");
        if (mediaDebug) {
            SimpleDateFormat simpleDateFormat =
                new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss");
            String date = simpleDateFormat.format(new Date());
            StringBuffer buf = new StringBuffer();
            buf.append(peersHome).append(File.separator);
            buf.append(MEDIA_DIR).append(File.separator);
            buf.append(date).append("_");
            buf.append(audioFormat.getEncoding()).append("_");
            buf.append(audioFormat.getSampleRate()).append("_");
            buf.append(audioFormat.getSampleSizeInBits()).append("_");
            buf.append(audioFormat.getChannels()).append("_");
            buf.append(audioFormat.isBigEndian() ? "be" : "le");
            try {
                microphoneOutput = new FileOutputStream(buf.toString()
                        + "_microphone.output");
                speakerInput = new FileOutputStream(buf.toString()
                        + "_speaker.input");
            } catch (FileNotFoundException e) {
                logger.error("cannot create file", e);
                return;
            }
        }
        // AccessController.doPrivileged added for plugin compatibility
        AccessController.doPrivileged(
            new PrivilegedAction() {

                @Override
                public Void run() {
                    try {
                        targetDataLine = (TargetDataLine) AudioSystem.getLine(targetInfo);
                        targetDataLine.open(audioFormat);
                    } catch (LineUnavailableException e) {
                        logger.error("target line unavailable", e);
                        return null;
                    } catch (SecurityException e) {
                        logger.error("security exception", e);
                        return null;
                    } catch (Throwable t) {
                        logger.error("throwable " + t.getMessage());
                        return null;
                    }
                    targetDataLine.start();
                    synchronized (sourceDataLineMutex) {
                        try {
                            sourceDataLine = (SourceDataLine) AudioSystem.getLine(sourceInfo);
                            sourceDataLine.open(audioFormat);
                        } catch (LineUnavailableException e) {
                            logger.error("source line unavailable", e);
                            return null;
                        }
                        sourceDataLine.start();
                    }
                    return null;
                }
        });

    }

    @Override
    public synchronized void close() {
        logger.debug("closeLines");
        if (microphoneOutput != null) {
            try {
                microphoneOutput.close();
            } catch (IOException e) {
                logger.error("cannot close file", e);
            }
            microphoneOutput = null;
        }
        if (speakerInput != null) {
            try {
                speakerInput.close();
            } catch (IOException e) {
                logger.error("cannot close file", e);
            }
            speakerInput = null;
        }
        // AccessController.doPrivileged added for plugin compatibility
        AccessController.doPrivileged(new PrivilegedAction() {

            @Override
            public Void run() {
                if (targetDataLine != null) {
                    targetDataLine.close();
                    targetDataLine = null;
                }
                synchronized (sourceDataLineMutex) {
                    if (sourceDataLine != null) {
                        sourceDataLine.drain();
                        sourceDataLine.stop();
                        sourceDataLine.close();
                        sourceDataLine = null;
                    }
                }
                return null;
            }
        });
    }

    @Override
    public synchronized byte[] readData() {
        if (targetDataLine == null) {
            return null;
        }
        int ready = targetDataLine.available();
        while (ready == 0) {
            try {
                Thread.sleep(2);
                ready = targetDataLine.available();
            } catch (InterruptedException e) {
                return null;
            }
        }
        if (ready <= 0) {
            return null;
        }
        byte[] buffer = new byte[ready];
        targetDataLine.read(buffer, 0, buffer.length);
        if (mediaDebug) {
            try {
                microphoneOutput.write(buffer, 0, buffer.length);
            } catch (IOException e) {
                logger.error("cannot write to file", e);
                return null;
            }
        }
        return buffer;
    }

    @Override
    public int writeData(byte[] buffer, int offset, int length) {
        int numberOfBytesWritten;
        synchronized (sourceDataLineMutex) {
            if (sourceDataLine == null) {
                return 0;
            }
            numberOfBytesWritten = sourceDataLine.write(buffer, offset, length);
        }
        if (mediaDebug) {
            try {
                speakerInput.write(buffer, offset, numberOfBytesWritten);
            } catch (IOException e) {
                logger.error("cannot write to file", e);
                return -1;
            }
        }
        return numberOfBytesWritten;
    }

}