/**
  * @RDE_HEADER@
  * GenericBase
  * $Id$
  * $HeadURL$
  * $Author$
  */

#include "generic_base.h"

#include <NGLLogger/NGLLoggerBootstrap.h>
#include <QStringList>
#include <QMetaMethod>

namespace DDS
{
namespace Helper
{

static inline bool endsWith(std::string const &str, std::string const &end)
{
  if (end.size() > str.size())
    return false;
  return std::equal(end.rbegin(), end.rend(), str.rbegin());
}

static inline std::string getSimpleTopicName(const std::string &fqName)
{
  const size_t idx = fqName.rfind("::");
  if (idx == std::string::npos)
    return fqName;
  return fqName.substr(idx + 2);
}

std::string getFunctionTopicName(const std::string &fqName)
{
  const std::string ftName = getSimpleTopicName(fqName);
  static const std::string request("Request");
  static const std::string reply("Reply");
  if (endsWith(ftName, request))
    return ftName.substr(0, ftName.size() - request.size());
  if (endsWith(ftName, reply))
    return ftName.substr(0, ftName.size() - reply.size());
  return ftName;
}

std::string getShortTopicName(const std::string &fqName)
{
  // add short project name instead of long project namespace (with ::)
  // i. e. Lts::SpatialData => LTS_SpatialData
  return std::string("LTS_") + getSimpleTopicName(fqName);
}

QMetaMethod getMethod(NGL::INGLLogger &logger,
                      QObject *objectToInform,
                      const char *slotToExecute,
                      const char *signalSignature,
                      bool bWarnOnEmptySlot)
{
  QMetaMethod ret;
  if(!slotToExecute || !objectToInform)
  {
    if(bWarnOnEmptySlot)
      WARNING_LOG(logger) << "invalid arguments to getMethod()";
    return ret;
  }

  int slotCode = slotToExecute[0] - '0';
  // check if it's really a signal or slot
  if(slotCode != QSLOT_CODE && slotCode != QSIGNAL_CODE)
  {
    ERROR_LOG(logger) << "Use the SLOT or SIGNAL macro for slot name!";
    return ret;
  }

  slotToExecute++;  // skip code
  const QMetaObject *mo = objectToInform->metaObject();
  const QByteArray slot = QMetaObject::normalizedSignature(slotToExecute);
  const int indexOfSlot = mo->indexOfSlot(slot.data());

  if(indexOfSlot < 0)
  {
    WARNING_LOG(logger) << "No such slot " << mo->className() << "::" << slot;
    return ret;
  }
  const QByteArray signal = QMetaObject::normalizedSignature(signalSignature);
  if(!QMetaObject::checkConnectArgs(signal.data(), slot.data()))
  {
    WARNING_LOG(logger) << "Incompatible slot arguments " << mo->className() << "::"
                        << slot << ", must be: " << signal;
    return ret;
  }
  return mo->method(indexOfSlot);
}
} // namespace Helper
} // namespace DDS