///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2018 Edouard Griffiths, F4EXB.                                  //
//                                                                               //
// Remote sink channel (Rx) UDP sender thread                                    //
//                                                                               //
// SDRangel can work as a detached SDR front end. With this plugin it can        //
// sends the I/Q samples stream to another SDRangel instance via UDP.            //
// It is controlled via a Web REST API.                                          //
//                                                                               //
// 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 as version 3 of the License, or                  //
// (at your option) 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 V3 for more details.                               //
//                                                                               //
// You should have received a copy of the GNU General Public License             //
// along with this program. If not, see <http://www.gnu.org/licenses/>.          //
///////////////////////////////////////////////////////////////////////////////////

#include "remotesink.h"

#include <sys/time.h>
#include <unistd.h>
#include <boost/crc.hpp>
#include <boost/cstdint.hpp>

#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QBuffer>

#include "SWGChannelSettings.h"

#include "util/simpleserializer.h"
#include "dsp/threadedbasebandsamplesink.h"
#include "dsp/downchannelizer.h"
#include "dsp/dspcommands.h"
#include "device/devicesourceapi.h"

#include "../remotesink/remotesinkthread.h"

MESSAGE_CLASS_DEFINITION(RemoteSink::MsgConfigureRemoteSink, Message)
MESSAGE_CLASS_DEFINITION(RemoteSink::MsgSampleRateNotification, Message)

const QString RemoteSink::m_channelIdURI = "sdrangel.channel.remotesink";
const QString RemoteSink::m_channelId = "RemoteSink";

RemoteSink::RemoteSink(DeviceSourceAPI *deviceAPI) :
        ChannelSinkAPI(m_channelIdURI),
        m_deviceAPI(deviceAPI),
        m_running(false),
        m_sinkThread(0),
        m_txBlockIndex(0),
        m_frameCount(0),
        m_sampleIndex(0),
        m_dataBlock(0),
        m_centerFrequency(0),
        m_sampleRate(48000),
        m_nbBlocksFEC(0),
        m_txDelay(35),
        m_dataAddress("127.0.0.1"),
        m_dataPort(9090)
{
    setObjectName(m_channelId);

    m_channelizer = new DownChannelizer(this);
    m_threadedChannelizer = new ThreadedBasebandSampleSink(m_channelizer, this);
    m_deviceAPI->addThreadedSink(m_threadedChannelizer);
    m_deviceAPI->addChannelAPI(this);

    m_networkManager = new QNetworkAccessManager();
    connect(m_networkManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(networkManagerFinished(QNetworkReply*)));
}

RemoteSink::~RemoteSink()
{
    disconnect(m_networkManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(networkManagerFinished(QNetworkReply*)));
    delete m_networkManager;
    m_dataBlockMutex.lock();

    if (m_dataBlock && !m_dataBlock->m_txControlBlock.m_complete) {
        delete m_dataBlock;
    }

    m_dataBlockMutex.unlock();
    m_deviceAPI->removeChannelAPI(this);
    m_deviceAPI->removeThreadedSink(m_threadedChannelizer);
    delete m_threadedChannelizer;
    delete m_channelizer;
}

void RemoteSink::setTxDelay(int txDelay, int nbBlocksFEC)
{
    double txDelayRatio = txDelay / 100.0;
    int samplesPerBlock = RemoteNbBytesPerBlock / sizeof(Sample);
    double delay = m_sampleRate == 0 ? 1.0 : (127*samplesPerBlock*txDelayRatio) / m_sampleRate;
    delay /= 128 + nbBlocksFEC;
    m_txDelay = roundf(delay*1e6); // microseconds
    qDebug() << "RemoteSink::setTxDelay:"
            << " " << txDelay
            << "% m_txDelay: " << m_txDelay << "us"
            << " m_sampleRate: " << m_sampleRate << "S/s";
}

void RemoteSink::setNbBlocksFEC(int nbBlocksFEC)
{
    qDebug() << "RemoteSink::setNbBlocksFEC: nbBlocksFEC: " << nbBlocksFEC;
    m_nbBlocksFEC = nbBlocksFEC;
}

void RemoteSink::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool firstOfBurst)
{
    (void) firstOfBurst;
    SampleVector::const_iterator it = begin;

    while (it != end)
    {
        int inSamplesIndex = it - begin;
        int inRemainingSamples = end - it;

        if (m_txBlockIndex == 0)
        {
            struct timeval tv;
            RemoteMetaDataFEC metaData;
            gettimeofday(&tv, 0);

            metaData.m_centerFrequency = m_centerFrequency;
            metaData.m_sampleRate = m_sampleRate;
            metaData.m_sampleBytes = (SDR_RX_SAMP_SZ <= 16 ? 2 : 4);
            metaData.m_sampleBits = SDR_RX_SAMP_SZ;
            metaData.m_nbOriginalBlocks = RemoteNbOrginalBlocks;
            metaData.m_nbFECBlocks = m_nbBlocksFEC;
            metaData.m_tv_sec = tv.tv_sec;
            metaData.m_tv_usec = tv.tv_usec;

            if (!m_dataBlock) { // on the very first cycle there is no data block allocated
                m_dataBlock = new RemoteDataBlock();
            }

            boost::crc_32_type crc32;
            crc32.process_bytes(&metaData, 20);
            metaData.m_crc32 = crc32.checksum();
            RemoteSuperBlock& superBlock = m_dataBlock->m_superBlocks[0]; // first block
            superBlock.init();
            superBlock.m_header.m_frameIndex = m_frameCount;
            superBlock.m_header.m_blockIndex = m_txBlockIndex;
            superBlock.m_header.m_sampleBytes = (SDR_RX_SAMP_SZ <= 16 ? 2 : 4);
            superBlock.m_header.m_sampleBits = SDR_RX_SAMP_SZ;

            RemoteMetaDataFEC *destMeta = (RemoteMetaDataFEC *) &superBlock.m_protectedBlock;
            *destMeta = metaData;

            if (!(metaData == m_currentMetaFEC))
            {
                qDebug() << "RemoteSink::feed: meta: "
                        << "|" << metaData.m_centerFrequency
                        << ":" << metaData.m_sampleRate
                        << ":" << (int) (metaData.m_sampleBytes & 0xF)
                        << ":" << (int) metaData.m_sampleBits
                        << "|" << (int) metaData.m_nbOriginalBlocks
                        << ":" << (int) metaData.m_nbFECBlocks
                        << "|" << metaData.m_tv_sec
                        << ":" << metaData.m_tv_usec;

                m_currentMetaFEC = metaData;
            }

            m_txBlockIndex = 1; // next Tx block with data
        } // block zero

        // handle different sample sizes...
        int samplesPerBlock = RemoteNbBytesPerBlock / (SDR_RX_SAMP_SZ <= 16 ? 4 : 8); // two I or Q samples
        if (m_sampleIndex + inRemainingSamples < samplesPerBlock) // there is still room in the current super block
        {
            memcpy((void *) &m_superBlock.m_protectedBlock.buf[m_sampleIndex*sizeof(Sample)],
                    (const void *) &(*(begin+inSamplesIndex)),
                    inRemainingSamples * sizeof(Sample));
            m_sampleIndex += inRemainingSamples;
            it = end; // all input samples are consumed
        }
        else // complete super block and initiate the next if not end of frame
        {
            memcpy((void *) &m_superBlock.m_protectedBlock.buf[m_sampleIndex*sizeof(Sample)],
                    (const void *) &(*(begin+inSamplesIndex)),
                    (samplesPerBlock - m_sampleIndex) * sizeof(Sample));
            it += samplesPerBlock - m_sampleIndex;
            m_sampleIndex = 0;

            m_superBlock.m_header.m_frameIndex = m_frameCount;
            m_superBlock.m_header.m_blockIndex = m_txBlockIndex;
            m_superBlock.m_header.m_sampleBytes = (SDR_RX_SAMP_SZ <= 16 ? 2 : 4);
            m_superBlock.m_header.m_sampleBits = SDR_RX_SAMP_SZ;
            m_dataBlock->m_superBlocks[m_txBlockIndex] = m_superBlock;

            if (m_txBlockIndex == RemoteNbOrginalBlocks - 1) // frame complete
            {
                m_dataBlockMutex.lock();
                m_dataBlock->m_txControlBlock.m_frameIndex = m_frameCount;
                m_dataBlock->m_txControlBlock.m_processed = false;
                m_dataBlock->m_txControlBlock.m_complete = true;
                m_dataBlock->m_txControlBlock.m_nbBlocksFEC = m_nbBlocksFEC;
                m_dataBlock->m_txControlBlock.m_txDelay = m_txDelay;
                m_dataBlock->m_txControlBlock.m_dataAddress = m_dataAddress;
                m_dataBlock->m_txControlBlock.m_dataPort = m_dataPort;

                emit dataBlockAvailable(m_dataBlock);
                m_dataBlock = new RemoteDataBlock(); // create a new one immediately
                m_dataBlockMutex.unlock();

                m_txBlockIndex = 0;
                m_frameCount++;
            }
            else
            {
                m_txBlockIndex++;
            }
        }
    }
}

void RemoteSink::start()
{
    qDebug("RemoteSink::start");

    memset((void *) &m_currentMetaFEC, 0, sizeof(RemoteMetaDataFEC));

    if (m_running) {
        stop();
    }

    m_sinkThread = new RemoteSinkThread();
    connect(this,
            SIGNAL(dataBlockAvailable(RemoteDataBlock *)),
            m_sinkThread,
            SLOT(processDataBlock(RemoteDataBlock *)),
            Qt::QueuedConnection);
    m_sinkThread->startStop(true);
    m_running = true;
}

void RemoteSink::stop()
{
    qDebug("RemoteSink::stop");

    if (m_sinkThread != 0)
    {
        m_sinkThread->startStop(false);
        m_sinkThread->deleteLater();
        m_sinkThread = 0;
    }

    m_running = false;
}

bool RemoteSink::handleMessage(const Message& cmd)
{
    (void) cmd;
	if (DownChannelizer::MsgChannelizerNotification::match(cmd))
	{
		DownChannelizer::MsgChannelizerNotification& notif = (DownChannelizer::MsgChannelizerNotification&) cmd;

        qDebug() << "RemoteSink::handleMessage: MsgChannelizerNotification:"
                << " channelSampleRate: " << notif.getSampleRate()
                << " offsetFrequency: " << notif.getFrequencyOffset();

        if (notif.getSampleRate() > 0) {
            setSampleRate(notif.getSampleRate());
        }

        setTxDelay(m_settings.m_txDelay, m_settings.m_nbFECBlocks);

        if (m_guiMessageQueue)
        {
            MsgSampleRateNotification *msg = MsgSampleRateNotification::create(notif.getSampleRate());
            m_guiMessageQueue->push(msg);
        }

		return true;
	}
    else if (DSPSignalNotification::match(cmd))
    {
        DSPSignalNotification& notif = (DSPSignalNotification&) cmd;

        qDebug() << "RemoteSink::handleMessage: DSPSignalNotification:"
                << " inputSampleRate: " << notif.getSampleRate()
                << " centerFrequency: " << notif.getCenterFrequency();

        setCenterFrequency(notif.getCenterFrequency());

        return true;
    }
    else if (MsgConfigureRemoteSink::match(cmd))
    {
        MsgConfigureRemoteSink& cfg = (MsgConfigureRemoteSink&) cmd;
        qDebug() << "RemoteSink::handleMessage: MsgConfigureRemoteSink";
        applySettings(cfg.getSettings(), cfg.getForce());

        return true;
    }
    else
    {
        return false;
    }
}

QByteArray RemoteSink::serialize() const
{
    return m_settings.serialize();
}

bool RemoteSink::deserialize(const QByteArray& data)
{
    (void) data;
    if (m_settings.deserialize(data))
    {
        MsgConfigureRemoteSink *msg = MsgConfigureRemoteSink::create(m_settings, true);
        m_inputMessageQueue.push(msg);
        return true;
    }
    else
    {
        m_settings.resetToDefaults();
        MsgConfigureRemoteSink *msg = MsgConfigureRemoteSink::create(m_settings, true);
        m_inputMessageQueue.push(msg);
        return false;
    }
}

void RemoteSink::applySettings(const RemoteSinkSettings& settings, bool force)
{
    qDebug() << "RemoteSink::applySettings:"
            << " m_nbFECBlocks: " << settings.m_nbFECBlocks
            << " m_txDelay: " << settings.m_txDelay
            << " m_dataAddress: " << settings.m_dataAddress
            << " m_dataPort: " << settings.m_dataPort
            << " force: " << force;

    QList<QString> reverseAPIKeys;

    if ((m_settings.m_nbFECBlocks != settings.m_nbFECBlocks) || force)
    {
        reverseAPIKeys.append("nbFECBlocks");
        setNbBlocksFEC(settings.m_nbFECBlocks);
        setTxDelay(settings.m_txDelay, settings.m_nbFECBlocks);
    }

    if ((m_settings.m_txDelay != settings.m_txDelay) || force)
    {
        reverseAPIKeys.append("txDelay");
        setTxDelay(settings.m_txDelay, settings.m_nbFECBlocks);
    }

    if ((m_settings.m_dataAddress != settings.m_dataAddress) || force)
    {
        reverseAPIKeys.append("dataAddress");
        m_dataAddress = settings.m_dataAddress;
    }

    if ((m_settings.m_dataPort != settings.m_dataPort) || force)
    {
        reverseAPIKeys.append("dataPort");
        m_dataPort = settings.m_dataPort;
    }

    if ((settings.m_useReverseAPI) && (reverseAPIKeys.size() != 0))
    {
        bool fullUpdate = ((m_settings.m_useReverseAPI != settings.m_useReverseAPI) && settings.m_useReverseAPI) ||
                (m_settings.m_reverseAPIAddress != settings.m_reverseAPIAddress) ||
                (m_settings.m_reverseAPIPort != settings.m_reverseAPIPort) ||
                (m_settings.m_reverseAPIDeviceIndex != settings.m_reverseAPIDeviceIndex) ||
                (m_settings.m_reverseAPIChannelIndex != settings.m_reverseAPIChannelIndex);
        webapiReverseSendSettings(reverseAPIKeys, settings, fullUpdate || force);
    }

    m_settings = settings;
}

int RemoteSink::webapiSettingsGet(
        SWGSDRangel::SWGChannelSettings& response,
        QString& errorMessage)
{
    (void) errorMessage;
    response.setRemoteSinkSettings(new SWGSDRangel::SWGRemoteSinkSettings());
    response.getRemoteSinkSettings()->init();
    webapiFormatChannelSettings(response, m_settings);
    return 200;
}

int RemoteSink::webapiSettingsPutPatch(
        bool force,
        const QStringList& channelSettingsKeys,
        SWGSDRangel::SWGChannelSettings& response,
        QString& errorMessage)
{
    (void) errorMessage;
    RemoteSinkSettings settings = m_settings;

    if (channelSettingsKeys.contains("nbFECBlocks"))
    {
        int nbFECBlocks = response.getRemoteSinkSettings()->getNbFecBlocks();

        if ((nbFECBlocks < 0) || (nbFECBlocks > 127)) {
            settings.m_nbFECBlocks = 8;
        } else {
            settings.m_nbFECBlocks = response.getRemoteSinkSettings()->getNbFecBlocks();
        }
    }

    if (channelSettingsKeys.contains("txDelay"))
    {
        int txDelay = response.getRemoteSinkSettings()->getTxDelay();

        if (txDelay < 0) {
            settings.m_txDelay = 35;
        } else {
            settings.m_txDelay = txDelay;
        }
    }

    if (channelSettingsKeys.contains("dataAddress")) {
        settings.m_dataAddress = *response.getRemoteSinkSettings()->getDataAddress();
    }

    if (channelSettingsKeys.contains("dataPort"))
    {
        int dataPort = response.getRemoteSinkSettings()->getDataPort();

        if ((dataPort < 1024) || (dataPort > 65535)) {
            settings.m_dataPort = 9090;
        } else {
            settings.m_dataPort = dataPort;
        }
    }

    if (channelSettingsKeys.contains("rgbColor")) {
        settings.m_rgbColor = response.getRemoteSinkSettings()->getRgbColor();
    }
    if (channelSettingsKeys.contains("title")) {
        settings.m_title = *response.getRemoteSinkSettings()->getTitle();
    }
    if (channelSettingsKeys.contains("useReverseAPI")) {
        settings.m_useReverseAPI = response.getRemoteSinkSettings()->getUseReverseApi() != 0;
    }
    if (channelSettingsKeys.contains("reverseAPIAddress")) {
        settings.m_reverseAPIAddress = *response.getRemoteSinkSettings()->getReverseApiAddress();
    }
    if (channelSettingsKeys.contains("reverseAPIPort")) {
        settings.m_reverseAPIPort = response.getRemoteSinkSettings()->getReverseApiPort();
    }
    if (channelSettingsKeys.contains("reverseAPIDeviceIndex")) {
        settings.m_reverseAPIDeviceIndex = response.getRemoteSinkSettings()->getReverseApiDeviceIndex();
    }
    if (channelSettingsKeys.contains("reverseAPIChannelIndex")) {
        settings.m_reverseAPIChannelIndex = response.getRemoteSinkSettings()->getReverseApiChannelIndex();
    }

    MsgConfigureRemoteSink *msg = MsgConfigureRemoteSink::create(settings, force);
    m_inputMessageQueue.push(msg);

    qDebug("RemoteSink::webapiSettingsPutPatch: forward to GUI: %p", m_guiMessageQueue);
    if (m_guiMessageQueue) // forward to GUI if any
    {
        MsgConfigureRemoteSink *msgToGUI = MsgConfigureRemoteSink::create(settings, force);
        m_guiMessageQueue->push(msgToGUI);
    }

    webapiFormatChannelSettings(response, settings);

    return 200;
}

void RemoteSink::webapiFormatChannelSettings(SWGSDRangel::SWGChannelSettings& response, const RemoteSinkSettings& settings)
{
    response.getRemoteSinkSettings()->setNbFecBlocks(settings.m_nbFECBlocks);
    response.getRemoteSinkSettings()->setTxDelay(settings.m_txDelay);

    if (response.getRemoteSinkSettings()->getDataAddress()) {
        *response.getRemoteSinkSettings()->getDataAddress() = settings.m_dataAddress;
    } else {
        response.getRemoteSinkSettings()->setDataAddress(new QString(settings.m_dataAddress));
    }

    response.getRemoteSinkSettings()->setDataPort(settings.m_dataPort);
    response.getRemoteSinkSettings()->setRgbColor(settings.m_rgbColor);

    if (response.getRemoteSinkSettings()->getTitle()) {
        *response.getRemoteSinkSettings()->getTitle() = settings.m_title;
    } else {
        response.getRemoteSinkSettings()->setTitle(new QString(settings.m_title));
    }

    response.getRemoteSinkSettings()->setUseReverseApi(settings.m_useReverseAPI ? 1 : 0);

    if (response.getRemoteSinkSettings()->getReverseApiAddress()) {
        *response.getRemoteSinkSettings()->getReverseApiAddress() = settings.m_reverseAPIAddress;
    } else {
        response.getRemoteSinkSettings()->setReverseApiAddress(new QString(settings.m_reverseAPIAddress));
    }

    response.getRemoteSinkSettings()->setReverseApiPort(settings.m_reverseAPIPort);
    response.getRemoteSinkSettings()->setReverseApiDeviceIndex(settings.m_reverseAPIDeviceIndex);
    response.getRemoteSinkSettings()->setReverseApiChannelIndex(settings.m_reverseAPIChannelIndex);
}

void RemoteSink::webapiReverseSendSettings(QList<QString>& channelSettingsKeys, const RemoteSinkSettings& settings, bool force)
{
    SWGSDRangel::SWGChannelSettings *swgChannelSettings = new SWGSDRangel::SWGChannelSettings();
    swgChannelSettings->setTx(0);
    swgChannelSettings->setOriginatorChannelIndex(getIndexInDeviceSet());
    swgChannelSettings->setOriginatorDeviceSetIndex(getDeviceSetIndex());
    swgChannelSettings->setChannelType(new QString("RemoteSink"));
    swgChannelSettings->setRemoteSinkSettings(new SWGSDRangel::SWGRemoteSinkSettings());
    SWGSDRangel::SWGRemoteSinkSettings *swgRemoteSinkSettings = swgChannelSettings->getRemoteSinkSettings();

    // transfer data that has been modified. When force is on transfer all data except reverse API data

    if (channelSettingsKeys.contains("nbFECBlocks") || force) {
        swgRemoteSinkSettings->setNbFecBlocks(settings.m_nbFECBlocks);
    }
    if (channelSettingsKeys.contains("txDelay") || force)
    {
        swgRemoteSinkSettings->setTxDelay(settings.m_txDelay);
    }
    if (channelSettingsKeys.contains("dataAddress") || force) {
        swgRemoteSinkSettings->setDataAddress(new QString(settings.m_dataAddress));
    }
    if (channelSettingsKeys.contains("dataPort") || force) {
        swgRemoteSinkSettings->setDataPort(settings.m_dataPort);
    }
    if (channelSettingsKeys.contains("rgbColor") || force) {
        swgRemoteSinkSettings->setRgbColor(settings.m_rgbColor);
    }
    if (channelSettingsKeys.contains("title") || force) {
        swgRemoteSinkSettings->setTitle(new QString(settings.m_title));
    }

    QString channelSettingsURL = QString("http://%1:%2/sdrangel/deviceset/%3/channel/%4/settings")
            .arg(settings.m_reverseAPIAddress)
            .arg(settings.m_reverseAPIPort)
            .arg(settings.m_reverseAPIDeviceIndex)
            .arg(settings.m_reverseAPIChannelIndex);
    m_networkRequest.setUrl(QUrl(channelSettingsURL));
    m_networkRequest.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");

    QBuffer *buffer=new QBuffer();
    buffer->open((QBuffer::ReadWrite));
    buffer->write(swgChannelSettings->asJson().toUtf8());
    buffer->seek(0);

    // Always use PATCH to avoid passing reverse API settings
    m_networkManager->sendCustomRequest(m_networkRequest, "PATCH", buffer);

    delete swgChannelSettings;
}

void RemoteSink::networkManagerFinished(QNetworkReply *reply)
{
    QNetworkReply::NetworkError replyError = reply->error();

    if (replyError)
    {
        qWarning() << "RemoteSink::networkManagerFinished:"
                << " error(" << (int) replyError
                << "): " << replyError
                << ": " << reply->errorString();
        return;
    }

    QString answer = reply->readAll();
    answer.chop(1); // remove last \n
    qDebug("RemoteSink::networkManagerFinished: reply:\n%s", answer.toStdString().c_str());
}