///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2017 Edouard Griffiths, F4EXB                                   //
//                                                                               //
// 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 "udpsinkfec.h"

#include <QThread>
#include <QDebug>

#include <boost/crc.hpp>
#include <boost/cstdint.hpp>

#include "util/timeutil.h"

#include "remoteoutputsender.h"

UDPSinkFEC::UDPSinkFEC() :
    m_sampleRate(48000),
    m_nbSamples(0),
    m_nbBlocksFEC(0),
    m_nbTxBytes(2),
    m_txDelayRatio(0.0),
    m_dataFrame(nullptr),
    m_txBlockIndex(0),
    m_txBlocksIndex(0),
    m_frameCount(0),
    m_sampleIndex(0),
    m_remoteOutputSender(nullptr),
    m_senderThread(nullptr),
    m_remoteAddress("127.0.0.1"),
    m_remotePort(9090)
{
    memset((char *) &m_superBlock, 0, sizeof(RemoteSuperBlock));
    m_currentMetaFEC.init();

    m_senderThread = new QThread(this);
    m_remoteOutputSender = new RemoteOutputSender();
    m_remoteOutputSender->moveToThread(m_senderThread);
}

UDPSinkFEC::~UDPSinkFEC()
{
    delete m_remoteOutputSender;
    delete m_senderThread;
}

void UDPSinkFEC::init()
{
    m_dataFrame = nullptr;
    m_txBlockIndex = 0;
    m_txBlocksIndex = 0;
    m_frameCount = 0;
    m_sampleIndex = 0;
}

void UDPSinkFEC::startSender()
{
    qDebug("UDPSinkFEC::startSender");
    m_remoteOutputSender->setDestination(m_remoteAddress, m_remotePort);
    m_senderThread->start();
}

void UDPSinkFEC::stopSender()
{
    qDebug("UDPSinkFEC::stopSender");
	m_senderThread->exit();
	m_senderThread->wait();
}

void UDPSinkFEC::setNbBlocksFEC(uint32_t nbBlocksFEC)
{
    qDebug() << "UDPSinkFEC::setNbBlocksFEC: nbBlocksFEC: " << nbBlocksFEC;
    m_nbBlocksFEC = nbBlocksFEC;
}

void UDPSinkFEC::setSampleRate(uint32_t sampleRate)
{
    qDebug() << "UDPSinkFEC::setSampleRate: sampleRate: " << sampleRate;
    m_sampleRate = sampleRate;
}

void UDPSinkFEC::setRemoteAddress(const QString& address, uint16_t port)
{
    qDebug() << "UDPSinkFEC::setRemoteAddress: address: " << address << " port: " << port;
    m_remoteAddress = address;
    m_remotePort = port;
    m_remoteOutputSender->setDestination(m_remoteAddress, m_remotePort);
}

void UDPSinkFEC::write(const SampleVector::iterator& begin, uint32_t sampleChunkSize, bool isTx)
{
    const SampleVector::iterator end = begin + sampleChunkSize;

    SampleVector::const_iterator it = begin;

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

        if (m_txBlockIndex == 0)
        {
            RemoteMetaDataFEC metaData;
            uint64_t nowus = TimeUtil::nowus();

            metaData.m_centerFrequency = 0; // frequency not set by stream
            metaData.m_sampleRate = m_sampleRate;
            metaData.m_sampleBytes = m_nbTxBytes;;
            metaData.m_sampleBits = getNbSampleBits();
            metaData.m_nbOriginalBlocks = RemoteNbOrginalBlocks;
            metaData.m_nbFECBlocks = m_nbBlocksFEC;
            metaData.m_tv_sec = nowus / 1000000UL;  // tv.tv_sec;
            metaData.m_tv_usec = nowus % 1000000UL; // tv.tv_usec;

            if (!m_dataFrame) { // on the very first cycle there is no data block allocated
                m_dataFrame = m_remoteOutputSender->getDataFrame(); // ask a new block to sender
            }

            boost::crc_32_type crc32;
            crc32.process_bytes(&metaData, sizeof(RemoteMetaDataFEC)-4);
            metaData.m_crc32 = crc32.checksum();
            RemoteSuperBlock& superBlock = m_dataFrame->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 = m_nbTxBytes;
            superBlock.m_header.m_sampleBits = getNbSampleBits();

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

            if (!(metaData == m_currentMetaFEC))
            {
                qDebug() << "UDPSinkFEC::write: 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 / (m_nbTxBytes * 2); // two I or Q samples
        if (m_sampleIndex + inRemainingSamples < samplesPerBlock) // there is still room in the current super block
        {
            convertSampleToData(begin + inSamplesIndex, inRemainingSamples, isTx);
            m_sampleIndex += inRemainingSamples;
            it = end; // all input samples are consumed
        }
        else // complete super block and initiate the next if not end of frame
        {
            convertSampleToData(begin + inSamplesIndex, samplesPerBlock - m_sampleIndex, isTx);
            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 = m_nbTxBytes;
            m_superBlock.m_header.m_sampleBits = getNbSampleBits();
            m_dataFrame->m_superBlocks[m_txBlockIndex] = m_superBlock;

            if (m_txBlockIndex == RemoteNbOrginalBlocks - 1) // frame complete
            {
                m_dataFrame->m_txControlBlock.m_frameIndex = m_frameCount;
                m_dataFrame->m_txControlBlock.m_processed = false;
                m_dataFrame->m_txControlBlock.m_complete = true;
                m_dataFrame->m_txControlBlock.m_nbBlocksFEC = m_nbBlocksFEC;
                m_dataFrame->m_txControlBlock.m_dataAddress = m_remoteAddress;
                m_dataFrame->m_txControlBlock.m_dataPort = m_remotePort;

                m_dataFrame = m_remoteOutputSender->getDataFrame(); // ask a new block to sender

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

uint32_t UDPSinkFEC::getNbSampleBits()
{
    if (m_nbTxBytes == 1) {
        return 8;
    } else if (m_nbTxBytes == 2) {
        return 16;
    } else if (m_nbTxBytes == 4) {
        return 24;
    } else {
        return 16;
    }
}