/***************************************************************************

  BionxControl
  © 2025 -2026 christoph holzheuer
  christoph.holzheuer@gmail.com

  Using:

  mhs_can_drv.c
  © 2011 - 2023 by MHS-Elektronik GmbH & Co. KG, Germany
  Klaus Demlehner, klaus@mhs-elektronik.de
  @see www.mhs-elektronik.de

  Based on Bionx data type descriptions from:

  BigXionFlasher USB V 0.2.4 rev. 97
  © 2011-2013 by Thomas Koenig <info@bigxionflasher.org>
  @see www.bigxionflasher.org

  Bionx Bike Info
  © 2018 Thorsten Schmidt (tschmidt@ts-soft.de)
  @see www.ts-soft.de

  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
  (at your option) any later version.
  @see https://github.com/bikemike/bionx-bikeinfo

 ***************************************************************************/


#include <QFile>
#include <QFileDialog>
#include <QMessageBox>
#include <QMetaEnum>
#include <QHash>

#include <bcxmlloader.h>


using namespace Qt::StringLiterals;

BCXmlLoader::BCXmlLoader(QObject *parent)
  : QObject(parent)
{
  //qRegisterMetaType<BCValue*>("BCValue*");
  //qRegisterMetaType<BCValue*>();
}


void BCXmlLoader::loadXmlBikeData( const QString& fileName )
{
  /*
  auto printAttrs = [](const QXmlStreamReader& xml)
  {
    QStringList parts;
    for (const auto &attr : xml.attributes())
    {
      parts << attr.name().toString() + "=\"" + attr.value().toString() + "\"";
    }
    qDebug().noquote() << parts.join(" ");
  };
  */

  QMetaEnum bcDeviceEnum{QMetaEnum::fromType<BCDevice::ID>()};

  QFile file(fileName);
  if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
    throw BCException( "Fehler", "Datei konnte nicht geöffnet werden.");

  _xml.setDevice(&file);

  if (_xml.readNextStartElement())
  {
    if (_xml.name() != "Bike"_L1 )
      throw BCException( "Fehler", "Falsches Datenformat.");
  }
  // ??
  Q_ASSERT(_xml.isStartElement() && _xml.name() == "Bike"_L1);

  while (!_xml.atEnd() && !_xml.hasError())
  {
    QXmlStreamReader::TokenType token = _xml.readNext();
    if (token == QXmlStreamReader::StartElement)
    {
      QString deviceType = _xml.attributes().value("Type"_L1).toString();
      // Wir wollen die Device-ID aus dem XML Tag ermitteln
      if( deviceType.isEmpty() )
        continue;

      QByteArray byteArray =  deviceType.toUtf8();
      const char* deviceKey = byteArray.constData();
      bool ok=false;
      auto optDeviceID = bcDeviceEnum.keyToValue(deviceKey,&ok);
      //_currentDeviceID = BCDevice::ID( deviceID.value_or( BCDevice::ID::Invalid ) );
      //if( optDeviceID.has_value())
      if(!ok)
        throw BCException( "Fehler", QString("Devicetype %1 existiert nicht.").arg(deviceType) );
      //BCDevice::ID currentDeviceID = BCDevice::ID( optDeviceID.value() );
      BCDevice::ID currentDeviceID = BCDevice::ID( optDeviceID );
      loadXmlBikeDeviceData(currentDeviceID);
    } // if startElement
  } // end while
}


/**
 * @brief Lädt deie Daten des BionX eBikes
 * @param deviceID
 */

void BCXmlLoader::loadXmlBikeDeviceData(BCDevice::ID deviceID)
{
  auto printAttrs = [](const QXmlStreamReader& xml)
  {
    QStringList parts;
    for (const auto &attr : xml.attributes())
      parts << attr.name().toString() + "=\"" + attr.value().toString() + "\"";
    qDebug().noquote() << parts.join(" ");
  };

  printAttrs (_xml);
  Q_ASSERT(_xml.isStartElement() && _xml.name() == BCTags::Device );

  // temporäre Wertliste für neues Device
  BCValueList currentValues;

  while( _xml.readNextStartElement() )
  {
    if( _xml.attributes().hasAttribute(BCTags::ID) )
    {    
      // füllen des Parameter packs
      BCValueParams params
      {
        .ID        = _xml.attributes().value(BCTags::ID).toString(),
        .Label     = _xml.attributes().value(BCTags::Label).toString(),
        .UnitLabel = _xml.attributes().value(BCTags::UnitLabel).toString(),
        .Factor    = _xml.attributes().value(BCTags::Factor).toString(),
        .Min       = _xml.attributes().value(BCTags::Min).toString(),
        .Max       = _xml.attributes().value(BCTags::Max).toString(),
        .IsWord    = _xml.attributes().value(BCTags::IsWord).toString(),
        .ReadOnly  = _xml.attributes().value(BCTags::ReadOnly).toString(),
        .ValueType = _xml.attributes().value(BCTags::ValueType).toString(),
      };

      // nur gültige Werte sind vorhanden und können gespeichert werden
      std::optional<BCValuePtr> newValue = makeValue( deviceID, params );
      if(newValue)
      {
        // wir merken uns gleich den index in der Werteliste
        (*newValue)->setIndexRow( currentValues.size() );
        currentValues.push_back( *newValue );
      }

    }
    // weiter zum nächsten Element
   _xml.skipCurrentElement();
  }

  // Wenn dieses Device fertig geladen wurde, soll das MainWindow es abholen
  if( !currentValues.isEmpty() )
    emit valueListReady( deviceID, currentValues );

}


/**
 * @brief Erzeugt einen BCValue für die DeviceID aus dem gegebenen parameter pack
 */

std::optional<BCValuePtr> BCXmlLoader::makeValue( BCDevice::ID deviceID, const BCValueParams& params )
{

  static QHash<QString,BCValue::ValueType> s_valueTypes
  {
    { "Plain",  BCValue::ValueType::Plain },
    { "Bool",   BCValue::ValueType::Bool },
    { "Number", BCValue::ValueType::Number },
    { "Float",  BCValue::ValueType::Float }
  };

  auto setIfExists = [&]<typename T>( T& target, QStringView source )
  {
    if( !source.isEmpty() )
    {
      bool ok;
      double testVal = source.toDouble(&ok);
      if (ok)
        target = testVal;
    }
  };

  //  Wir brauchen:
  //  - einen gültige ID String um die enum ID herauszufinden.
  //  - einen gültige UnitType String um den ValueType herauszufinden.

  // geht nicht auf qt6.8 von debian trixie
  //std::optional<quint64> IDVal = s_bcValueEnum.keyToValue64( params.ID.toLatin1().constData() );
  bool ok;
  static QMetaEnum s_bcValueEnum{QMetaEnum::fromType<BC::ID>()};
  QByteArray byteArray = params.ID.toUtf8();
  int IDVal = s_bcValueEnum.keyToValue( params.ID.toUtf8().constData(), &ok );
  //if( IDVal.has_value() )
  if( !ok )
    throw BCException( "Fehler", QString("Devicetype %1 existiert nicht.").arg(params.ID) );

  BCValuePtr newValuePtr = std::make_shared<BCValue>( deviceID, static_cast<BC::ID>(IDVal) );
  BCValue& newValue = *newValuePtr.get();

  // ValueType
  if( !s_valueTypes.contains( params.ValueType ) )
    throw BCException( "Fehler", QString("ValueType %1 existiert nicht.").arg(params.ValueType) );

  newValue._valueType = s_valueTypes[params.ValueType];

  newValue._label     = params.Label;
  newValue._unitLabel = params.UnitLabel;

  setIfExists( newValue._factor, params.Factor );
  setIfExists( newValue._optMin, params.Min );
  setIfExists( newValue._optMax, params.Max );

  if( params.IsWord == "true")
    newValue._valueFlags.setFlag( BCValue::Flag::IsWord, true );

  if( params.ReadOnly == "true")
    newValue._valueFlags.setFlag( BCValue::Flag::ReadOnly, true );

  //newValue.dumpValue();

  return std::optional<BCValuePtr>( newValuePtr );

}