/****************************************************************************
 *
 *   (c) 2009-2016 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
 *
 * QGroundControl is licensed according to the terms in the file
 * COPYING.md in the root of the source code directory.
 *
 ****************************************************************************/

#include "TaisyncManager.h"
#include "TaisyncHandler.h"
#include "SettingsManager.h"
#include "QGCApplication.h"
#include "VideoManager.h"

//-----------------------------------------------------------------------------
TaisyncManager::TaisyncManager(QGCApplication* app, QGCToolbox* toolbox)
    : QGCTool(app, toolbox)
{
    connect(&_workTimer, &QTimer::timeout, this, &TaisyncManager::_checkTaisync);
    _workTimer.setSingleShot(true);
    _decodeList.append(tr("Stream"));
    _decodeList.append(tr("HDMI Port"));
    _rateList.append(tr("Low"));
    _rateList.append(tr("Medium"));
    _rateList.append(tr("High"));
}

//-----------------------------------------------------------------------------
TaisyncManager::~TaisyncManager()
{
    if(_taiSettings) {
        _taiSettings->close();
        _taiSettings->deleteLater();
        _taiSettings = nullptr;
    }
#if defined(__ios__) || defined(__android__)
    if (_taiTelemetery) {
        _taiTelemetery->close();
        _taiTelemetery->deleteLater();
        _taiTelemetery = nullptr;
    }
    if(_telemetrySocket) {
        _telemetrySocket->close();
        _telemetrySocket->deleteLater();
        _telemetrySocket = nullptr;
    }
    if (_taiVideo) {
        _taiVideo->close();
        _taiVideo->deleteLater();
        _taiVideo = nullptr;
    }
#endif
}

//-----------------------------------------------------------------------------
void
TaisyncManager::setToolbox(QGCToolbox* toolbox)
{
    QGCTool::setToolbox(toolbox);
    _taiSettings = new TaisyncSettings(this);
    connect(_taiSettings, &TaisyncSettings::updateSettings, this, &TaisyncManager::_updateSettings);
    connect(_taiSettings, &TaisyncSettings::connected,      this, &TaisyncManager::_connected);
    _appSettings = toolbox->settingsManager()->appSettings();
    connect(_appSettings->enableTaisync(),      &Fact::rawValueChanged, this, &TaisyncManager::_setEnabled);
    connect(_appSettings->enableTaisyncVideo(), &Fact::rawValueChanged, this, &TaisyncManager::_setVideoEnabled);
    _setEnabled();
    if(_enabled) {
        _setVideoEnabled();
    }
}

//-----------------------------------------------------------------------------
void
TaisyncManager::setDecodeIndex(int idx)
{
    (void)idx;
}

//-----------------------------------------------------------------------------
void
TaisyncManager::setRateIndex(int idx)
{
    (void)idx;
}

//-----------------------------------------------------------------------------
void
TaisyncManager::_setEnabled()
{
    bool enable = _appSettings->enableTaisync()->rawValue().toBool();
    if(enable) {
#if defined(__ios__) || defined(__android__)
        _taiTelemetery = new TaisyncTelemetry(this);
        QObject::connect(_taiTelemetery, &TaisyncTelemetry::bytesReady, this, &TaisyncManager::_readTelemBytes);
        _telemetrySocket = new QUdpSocket(this);
        _telemetrySocket->setSocketOption(QAbstractSocket::SendBufferSizeSocketOption,    64 * 1024);
        _telemetrySocket->setSocketOption(QAbstractSocket::ReceiveBufferSizeSocketOption, 64 * 1024);
        QObject::connect(_telemetrySocket, &QUdpSocket::readyRead, this, &TaisyncManager::_readUDPBytes);
        _telemetrySocket->bind(QHostAddress::LocalHost, 0, QUdpSocket::ShareAddress);
#endif
        _workTimer.start(1000);
    } else {
#if defined(__ios__) || defined(__android__)
        if (_taiTelemetery) {
            _taiTelemetery->close();
            _taiTelemetery->deleteLater();
            _taiTelemetery = nullptr;
        }
#endif
        _workTimer.stop();
    }
    _enabled = enable;
}

//-----------------------------------------------------------------------------
void
TaisyncManager::_setVideoEnabled()
{
    bool enable = _appSettings->enableTaisyncVideo()->rawValue().toBool();
    if(enable) {
        //-- Hide video selection as we will be fixed to Taisync video and set the way we need it.
        VideoSettings* pVSettings = qgcApp()->toolbox()->settingsManager()->videoSettings();
        //-- First save current state
        _savedVideoSource = pVSettings->videoSource()->rawValue();
        _savedVideoUDP    = pVSettings->udpPort()->rawValue();
        _savedAR          = pVSettings->aspectRatio()->rawValue();
        _savedVideoState  = pVSettings->visible();
        //-- Now set it up the way we need it do be
        pVSettings->setVisible(false);
        pVSettings->udpPort()->setRawValue(5600);
        pVSettings->aspectRatio()->setRawValue(1024.0 / 768.0);
        pVSettings->videoSource()->setRawValue(QString(VideoSettings::videoSourceUDP));
#if defined(__ios__) || defined(__android__)
        //-- iOS and Android receive raw h.264 and need a different pipeline
        qgcApp()->toolbox()->videoManager()->setIsTaisync(true);
        _taiVideo = new TaisyncVideoReceiver(this);
        _taiVideo->start();
#endif
    } else {
        //-- Restore video settings
#if defined(__ios__) || defined(__android__)
        qgcApp()->toolbox()->videoManager()->setIsTaisync(false);
        if (_taiVideo) {
            _taiVideo->close();
            _taiVideo->deleteLater();
            _taiVideo = nullptr;
        }
#endif
        if(!_savedVideoSource.isValid()) {
            VideoSettings* pVSettings = qgcApp()->toolbox()->settingsManager()->videoSettings();
            pVSettings->videoSource()->setRawValue(_savedVideoSource);
            pVSettings->udpPort()->setRawValue(_savedVideoUDP);
            pVSettings->aspectRatio()->setRawValue(_savedAR);
            pVSettings->setVisible(_savedVideoState);
            _savedVideoSource.clear();
        }
    }
    _enableVideo = enable;
}

//-----------------------------------------------------------------------------
#if defined(__ios__) || defined(__android__)
void
TaisyncManager::_readTelemBytes(QByteArray bytesIn)
{
    //-- Send telemetry from vehicle to QGC (using normal UDP)
    _telemetrySocket->writeDatagram(bytesIn, QHostAddress::LocalHost, TAISYNC_TELEM_TARGET_PORT);
}
#endif

//-----------------------------------------------------------------------------
#if defined(__ios__) || defined(__android__)
void
TaisyncManager::_readUDPBytes()
{
    if (!_telemetrySocket || !_taiTelemetery) {
        return;
    }
    //-- Read UDP data from QGC
    while (_telemetrySocket->hasPendingDatagrams()) {
        QByteArray datagram;
        datagram.resize(static_cast<int>(_telemetrySocket->pendingDatagramSize()));
        _telemetrySocket->readDatagram(datagram.data(), datagram.size());
        //-- Send it to vehicle
        _taiTelemetery->writeBytes(datagram);
    }
}
#endif

//-----------------------------------------------------------------------------
void
TaisyncManager::_connected()
{
    qCDebug(TaisyncLog) << "Taisync Settings Connected";
    _isConnected = true;
    emit connectedChanged();
}

//-----------------------------------------------------------------------------
void
TaisyncManager::_checkTaisync()
{
    if(_enabled) {
        if(!_isConnected) {
            _taiSettings->start();
        } else {
            if(++_currReq >= REQ_LAST) {
                _currReq = REQ_LINK_STATUS;
            }
            switch(_currReq) {
            case REQ_LINK_STATUS:
                _taiSettings->requestLinkStatus();
                break;
            case REQ_DEV_INFO:
                _taiSettings->requestDevInfo();
                break;
            case REQ_FREQ_SCAN:
                _taiSettings->requestFreqScan();
                break;
            case REQ_VIDEO_SETTINGS:
                _taiSettings->requestVideoSettings();
                break;
            }
        }
        _workTimer.start(1000);
    }
}

//-----------------------------------------------------------------------------
void
TaisyncManager::_updateSettings(QByteArray jSonData)
{
    qDebug() << jSonData;
    QJsonParseError jsonParseError;
    QJsonDocument doc = QJsonDocument::fromJson(jSonData, &jsonParseError);
    if (jsonParseError.error != QJsonParseError::NoError) {
        qWarning() <<  "Unable to parse Taisync response:" << jsonParseError.errorString() << jsonParseError.offset;
        return;
    }
    QJsonObject jObj = doc.object();
    //-- Link Status?
    if(jSonData.contains("\"flight\":")) {
        _linkConnected  = jObj["flight"].toString("") == "online";
        _linkVidFormat  = jObj["videoformat"].toString(_linkVidFormat);
        _downlinkRSSI   = jObj["radiorssi"].toInt(_downlinkRSSI);
        _uplinkRSSI     = jObj["hdrssi"].toInt(_uplinkRSSI);
        emit linkChanged();
    //-- Device Info?
    } else if(jSonData.contains("\"firmwareversion\":")) {
        _fwVersion      = jObj["firmwareversion"].toString(_fwVersion);
        _serialNumber   = jObj["sn"].toString(_serialNumber);
    //-- Video Settings?
    } else if(jSonData.contains("\"maxbitrate\":")) {



    }
}