/**
  * Connection Handler for the serial connection to the sfm
  * $Id$
  * $HeadURL$
  * $Author$
  * Created by Philipp Dassow, NLST, 2018-01-29
  */

#include "connection_handler_serial.h"
#include <LtsUtilsCore/sfm_bytemessage_converter.h>

#include <QTimer>

namespace EffectShowClient
{

ConnectionHandlerSerial::ConnectionHandlerSerial(QObject *parent)
  : QObject(parent)
  , m_spQuerry(new LtsSerialPortQuerry::LtsSerialPortQuerry(this))
  , m_serialPort(nullptr)
  , m_receiveTimeoutTimer(new QTimer(this))
  , m_currentDataRead(QByteArray())
  , m_portName(QStringLiteral("COM5"))
  , m_readBuffer(new QByteArray())
  , m_logger(getLogger("ConnectionHandlerSerial"))
{
  m_receiveTimeoutTimer->setInterval(1700);
  connect(m_spQuerry, &LtsSerialPortQuerry::LtsSerialPortQuerry::connectionEstablished, this, &ConnectionHandlerSerial::open);
  m_spQuerry->restartQuerry();

  connect(m_receiveTimeoutTimer, &QTimer::timeout, m_spQuerry, &LtsSerialPortQuerry::LtsSerialPortQuerry::continueQuerry);
  connect(m_receiveTimeoutTimer, &QTimer::timeout, this, &ConnectionHandlerSerial::disconnectedFromSerialConverter);
}

ConnectionHandlerSerial::~ConnectionHandlerSerial()
{
  DEBUG_LOG(m_logger) << "ConnectionHandlerSerial::~ConnectionHandlerSerial";
}

bool ConnectionHandlerSerial::init()
{
  return true;
}

bool ConnectionHandlerSerial::send(const QByteArray &binaryData)
{
  // Checking port ---------------------------------------------

  if (!m_serialPort)
  {
    DEBUG_LOG(m_logger) << "Port is not initialized!";
    return false;
  }

  if (!m_serialPort->isOpen())
  {
    DEBUG_LOG(m_logger) << "Port is not opened!";
    return false;
  }

  // Sending data ---------------------------------------------

  const QByteArray writeThis = LtsUtils::byteStreamFromEscMessage(binaryData);
  DEBUG_LOG(m_logger) << "Send HEX:" << writeThis.toHex(' ');
  qint64 byteswritten = m_serialPort->write(writeThis);
  DEBUG_LOG(m_logger) << "Binary data:" << binaryData.size();
  DEBUG_LOG(m_logger) << "Try sending: " << writeThis.size();


  // Check for errors ---------------------------------------------

  if (byteswritten == -1)
  {
    DEBUG_LOG(m_logger) << "Failed to write data to port " << m_serialPort->portName() << " error: " << m_serialPort->errorString();
    return false;
  }
  else if (byteswritten != writeThis.size())
  {
    DEBUG_LOG(m_logger) << "Failed to write all data to port " << m_serialPort->portName() << " error: " << m_serialPort->errorString();
    return false;
  }

  return true;
}

bool ConnectionHandlerSerial::open()
{
  m_serialPort = m_spQuerry->currentSerialPort();
  connect(m_serialPort, &QSerialPort::readyRead, this, &ConnectionHandlerSerial::read);

  m_currentDataRead.clear();
  m_receiveTimeoutTimer->start();
  DEBUG_LOG(m_logger) << "(Re)openend serial port " << m_serialPort->portName() << " baudrate: " << m_serialPort->baudRate();

  emit connectedToSerialConverter();
  return true;
}

bool ConnectionHandlerSerial::isOpen() const
{
  return m_serialPort->isOpen();
}

void ConnectionHandlerSerial::read()
{
  const QByteArray ba = m_serialPort->readAll();
  m_currentDataRead.append(ba);

  //DEBUG_LOG(m_logger) << "Binary data from sfm: " << ba.toHex(' ');
  DEBUG_LOG(m_logger) << "Data size" << ba.size();
  int idxStart = -1;
  int idxEnd = -1;
  while ((idxStart = m_currentDataRead.indexOf(0x02)) >= 0 &&
         (idxEnd = m_currentDataRead.indexOf(0x03)) >= 0) // while complete message frame in buffer
  {

    //whatever happens: remove current frame from data
    //m_currentDataRead = m_currentDataRead.mid(idxEnd+1);

    QByteArray message = m_currentDataRead.mid(idxStart, (idxEnd - idxStart) + 1);
    m_currentDataRead = m_currentDataRead.mid(idxEnd + 1);
    DEBUG_LOG(m_logger) << "Data Message found: " << message.toHex(' ');
    message = LtsUtils::byteStreamToEscMessage(message);

    if (message.size() > 2)
    {
      ERROR_LOG(m_logger) << "Message to long: " << message.size();
      continue;
    }

    DEBUG_LOG(m_logger) << "Frame from sfm as binary " << message.toHex();
    //got message now remove frame


    unsigned int byte = 0;
    byte = message.at(0) & 0xFF;
    DEBUG_LOG(m_logger) << "ConnectionHandlerSerial::read var byte is" << byte;


    if (!isValidCommandByte(byte))
    {
      ERROR_LOG(m_logger) << "ConnectionHandlerSerial::read Commandbyte is invalid. Returning";
      return;
    }

    // If first byte is not between 43 and 91, then we need the second byte, because all other commands have payload. Just not this single piece of
    if (byte < 43 ||
        byte > 91)
    {
      if (message.size() > 1 &&
          !isValidPayloadByte(message.at(1)))
      {
        ERROR_LOG(m_logger) << "ConnectionHandlerSerial::read Payloadbyte is invalid. Returning";
        continue;
      }
    }

    if (message.size() != 2)
    {
      ERROR_LOG(m_logger) << "ConnectionHandlerSerial::read No 2nd byte was appended (QByteArray has bad size). Returning.";
      continue;
    }

    DEBUG_LOG(m_logger) << "Binary data from serial port: " << message.toHex(' ');
    m_receiveTimeoutTimer->start();

    emit received(message);
  }

  if (m_serialPort->bytesAvailable() > 0)
    DEBUG_LOG(m_logger) << "Still " << m_serialPort->bytesAvailable() << " available to be read";
}

bool ConnectionHandlerSerial::isValidCommandByte(const unsigned char command)
{
  DEBUG_LOG(m_logger) << "ConnectionHandlerSerial::isValidCommandByte" << command << (command == 192 ||
                                                                                      command == 240 ||
                                                                                      command == 244 ||
                                                                                      command == 255 ||
                                                                                      command == 144 ||
                                                                                      command == 202 ||
                                                                                      command == 224 ||
                                                                                      command == 213 ||
                                                                                      command == 15 ||
                                                                                      command == 42 ||
                                                                                      (command >= 43 &&
                                                                                       command <= 91));
  return (command == 192 ||
          command == 240 ||
          command == 244 ||
          command == 255 ||
          command == 144 ||
          command == 202 ||
          command == 224 ||
          command == 213 ||
          command == 15 ||
          command == 42 ||
          (command >= 43 &&
           command <= 91));
}

bool ConnectionHandlerSerial::isValidPayloadByte(const unsigned char payload)
{
  Q_UNUSED(payload);
  return true;
}
}