/*
 * Copyright (C) 2005-2019 Centre National d'Etudes Spatiales (CNES)
 *
 * This file is part of Orfeo Toolbox
 *
 *     https://www.orfeo-toolbox.org/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


#ifndef otbOGRFieldWrapper_hxx
#define otbOGRFieldWrapper_hxx

/*===========================================================================*/
/*===============================[ Includes ]================================*/
/*===========================================================================*/
#include "otbOGRFieldWrapper.h"
#include "otbConfigure.h"
#include <cassert>
#include <vector>
#include <boost/mpl/map.hpp>
#include <boost/mpl/vector.hpp>
#include <boost/mpl/pair.hpp>
#include <boost/mpl/int.hpp>
#include <boost/mpl/at.hpp>
#include <boost/mpl/assert.hpp>
// #include <boost/mpl/print.hpp>

#include <boost/static_assert.hpp>
#if defined(__GNUC__) || defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-local-typedefs"
#include <boost/range/size.hpp>
#pragma GCC diagnostic pop
#else
#include <boost/range/size.hpp>
#endif

#include <boost/type_traits/is_same.hpp>
// #include "boost/type_traits/is_array.hpp"
#include "boost/type_traits/is_contiguous.h" // from OTB actually

#if defined(__GNUC__) || defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wshadow"
#include "ogr_feature.h" // OGRFeature::*field_getters
#pragma GCC diagnostic pop
#else
#include "ogr_feature.h" // OGRFeature::*field_getters
#endif
#include "cpl_string.h" // CSLCount
#include "otbOGRHelpers.h"


/*===========================================================================*/
/*================[ Associations C++ types -> OGR functions ]================*/
/*===========================================================================*/

namespace otb
{
namespace ogr
{
/**\ingroup gGeometry
 * \defgroup GeometryInternals Geometry Internals
 * \since OTB v 3.14.0
 */

/**\ingroup GeometryInternals
 * Namespace used to host internal meta-prog definitions.
 * \since OTB v 3.14.0
 */
namespace internal
{ // namespace internal
namespace mpl = boost::mpl;

/**\ingroup GeometryInternals
 * Associative map of C++ types to OGR field types (\c OGRFieldType).
 * \internal Relies on Boost.MPL
 * \since OTB v 3.14.0
 * \todo \c OFTBinary, \c OFTDate, \c OFTTime and \c OFTDateTime are not managed
 * yet.
 */
typedef mpl::map<mpl::pair<int, mpl::int_<OFTInteger>>, mpl::pair<std::vector<int>, mpl::int_<OFTIntegerList>>, mpl::pair<double, mpl::int_<OFTReal>>,
                 mpl::pair<std::vector<double>, mpl::int_<OFTRealList>>, mpl::pair<std::string, mpl::int_<OFTString>>, mpl::pair<char*, mpl::int_<OFTString>>,
                 mpl::pair<char const*, mpl::int_<OFTString>>, mpl::pair<std::vector<std::string>, mpl::int_<OFTStringList>>,
                 mpl::pair<GIntBig, mpl::int_<OFTInteger64>>, mpl::pair<std::vector<GIntBig>, mpl::int_<OFTInteger64List>>

                 // OFTBinary
                 // OFTDate
                 // OFTTime
                 // OFTDateTime
                 >
    FieldType_Map;

/**\ingroup GeometryInternals
 * \class MemberGetterPtr
 * Type for hosting simple member-function pointers to field getters.
 * \tparam T type of field according to OGR API.
 * \tparam ptr_to_function member function pointer to a field getter from \c
 *         OGRFeature.
 * \tparam FinalReturnType type of the field according to OTB wrappers (default
 * <tt> = T</tt>)
 *
 * \internal
 * This is a hack to pass a member function pointer as template-parameter.
 * \since OTB v 3.14.0
 */
template <typename T
#if GDAL_VERSION_NUM >= 2030000
          ,
          T (OGRFeature::*ptr_to_function)(int) const
#else
          ,
          T (OGRFeature::*ptr_to_function)(int)
#endif
          ,
          typename FinalReturnType = T>
class MemberGetterPtr
{
public:
  static FinalReturnType call(OGRFeature& f, int index)
  {
    return (f.*ptr_to_function)(index);
  }
};

/**\ingroup GeometryInternals
 * \class StringListMemberGetterPtr
 * Type for hosting member-function pointers to string-list field getters.
 * \tparam FinalReturnType type of the field according to OTB wrappers (default
 * <tt> = T</tt>)
 *
 * \internal
 * This override is required because of the particular nature of the
 * <tt>char**</tt> type chosen by OGR API, plus the fact this is the only
 * const-correct getter...
 * \since OTB v 3.14.0
 */
template <typename FinalReturnType = std::vector<std::string>>
class StringListMemberGetterPtr
{
public:
  static FinalReturnType call(OGRFeature& f, int index)
  {
    char**          sl = f.GetFieldAsStringList(index);
    FinalReturnType res(sl, sl + CSLCount(sl));
    return res;
  }
};

/**\ingroup GeometryInternals
 * \class MemberSetterPtr
 * Type for hosting simple member-function pointers to field setters.
 * \tparam T type of field according to OGR API.
 * \tparam ptr_to_function member function pointer to a field setter from \c
 *         OGRFeature.
 * <tt> = T</tt>)
 *
 * \internal
 * This is a hack to pass a member function pointer as template-parameter.
 * \since OTB v 3.14.0
 */
template <typename T, void (OGRFeature::*ptr_to_function)(int, T value), typename ActualParamType = T>
class MemberSetterPtr
{
public:
  static void call(OGRFeature& f, int index, T const& value)
  {
    (f.*ptr_to_function)(index, value);
  }
};

/**\ingroup GeometryInternals
 * \class MemberContainerGetterPtr
 * Type for hosting simple member-function pointers to list-field getters.
 * \tparam T type of field according to OGR API.
 * \tparam ptr_to_function member function pointer to a list-field getter from
 * \c OGRFeature.
 * \tparam FinalReturnType type of the list-field according to OTB wrappers
 * (default <tt> = std::vector<T></tt>)
 *
 * \internal
 * This is a hack to pass a member function pointer as template-parameter.
 * \since OTB v 3.14.0
 */
template <typename T
#if GDAL_VERSION_NUM >= 2030000
          ,
          T const* (OGRFeature::*ptr_to_function)(int, int*)const
#else
          ,
          T const* (OGRFeature::*ptr_to_function)(int, int*)
#endif
          ,
          typename FinalReturnType = std::vector<T>>
class MemberContainerGetterPtr
{
public:
  static FinalReturnType call(OGRFeature& f, int index)
  {
    int                   nb            = 0;
    T const*              raw_container = (f.*ptr_to_function)(index, &nb);
    const FinalReturnType res(raw_container + 0, raw_container + nb);
    return res;
  }
};

/*===========================================================================*/
/**\ingroup GeometryInternals
 * \class TagDispatchMemberContainerSetterPtr
 * \brief Dispatcher function for the Field Setter.
 * The container-field setters from OGR API have a C API. This dispatcher will
 * check whether the parameter container has a contiguous storage. If so it will
 * directly inject the address of the first element of the contiguous container
 * in the OGR C API. If not, the container will be converted into a container
 * with contiguous storage.
 * \since OTB v 3.14.0
 */
template <typename T
#if GDAL_VERSION_NUM >= 2030000
          ,
          void (OGRFeature::*ptr_to_function)(int, int, const T*)
#else
          ,
          void (OGRFeature::*ptr_to_function)(int, int, T*) // not const-correct
#endif
              ,
          typename ActualParamType = std::vector<T>, bool Is_contiguous = boost::is_contiguous<ActualParamType>::value>
class TagDispatchMemberContainerSetterPtr;

/**\ingroup GeometryInternals
 */
template <typename T
#if GDAL_VERSION_NUM >= 2030000
          ,
          void (OGRFeature::*ptr_to_function)(int, int, const T*)
#else
          ,
          void (OGRFeature::*ptr_to_function)(int, int, T*) // not const-correct
#endif
              ,
          typename ActualParamType>
class TagDispatchMemberContainerSetterPtr<T, ptr_to_function, ActualParamType, true>
{
public:
  static void call(OGRFeature& f, int index, ActualParamType const& container)
  {
    const int nb = boost::size(container);
    (f.*ptr_to_function)(index, nb, const_cast<T*>(&container[0]));
  }
};

/**\ingroup GeometryInternals
 */
template <typename T
#if GDAL_VERSION_NUM >= 2030000
          ,
          void (OGRFeature::*ptr_to_function)(int, int, const T*)
#else
          ,
          void (OGRFeature::*ptr_to_function)(int, int, T*) // not const-correct
#endif
              ,
          typename ActualParamType>
class TagDispatchMemberContainerSetterPtr<T, ptr_to_function, ActualParamType, false>
{
public:
  static void call(OGRFeature& f, int index, ActualParamType const& container)
  {
    const int      nb = boost::size(container);
    std::vector<T> v(boost::begin(container), boost::end(container));
    (f.*ptr_to_function)(index, nb, &v[0]);
  }
};

/**\ingroup GeometryInternals
 * \class StringListMemberSetterPtr
 * Type for hosting member-function pointers to string-list field setters.
 * \tparam ActualParamType type of the field according to OTB wrappers (default
 * <tt> = T</tt>)
 *
 * \internal
 * This override is required because of the particular nature of the
 * <tt>char**</tt> type chosen by OGR API.
 * \since OTB v 3.14.0
 */
template <typename ActualParamType>
class StringListMemberSetterPtr
{
public:
  static void call(OGRFeature& f, int index, ActualParamType const& container)
  {
    f.SetField(index, StringListConverter(container).to_ogr());
  }
};

/**\ingroup GeometryInternals
 * \class MemberContainerSetterPtr
 * Type for hosting simple member-function pointers to list-field setters.
 * \tparam T type of field according to OGR API.
 * \tparam ptr_to_function member function pointer to a list-field setter from
 * \c OGRFeature.
 * \tparam FinalReturnType type of the list-field according to OTB wrappers
 * (default <tt> = std::vector<T></tt>)
 *
 * \internal
 * This is a hack to pass a member function pointer as template-parameter.
 * \since OTB v 3.14.0
 */
template <typename T
#if GDAL_VERSION_NUM >= 2030000
          ,
          void (OGRFeature::*ptr_to_function)(int, int, const T*)
#else
          ,
          void (OGRFeature::*ptr_to_function)(int, int, T*) // not const-correct
#endif
              ,
          typename ActualParamType = std::vector<T>>
class MemberContainerSetterPtr
{
public:
  static void call(OGRFeature& f, int index, ActualParamType const& container)
  {
    TagDispatchMemberContainerSetterPtr<T, ptr_to_function, ActualParamType, boost::is_contiguous<ActualParamType>::value>::call(f, index, container);
  }
};

/**\ingroup GeometryInternals
 * Associative map of OGR field types (\c OGRFieldType) to their associated
 * getters.
 * \internal Relies on Boost.MPL
 * \since OTB v 3.14.0
 */
typedef mpl::map<mpl::pair<mpl::int_<OFTInteger>, MemberGetterPtr<int, &OGRFeature::GetFieldAsInteger>>,
                 mpl::pair<mpl::int_<OFTIntegerList>, MemberContainerGetterPtr<int, &OGRFeature::GetFieldAsIntegerList>>,
                 mpl::pair<mpl::int_<OFTReal>, MemberGetterPtr<double, &OGRFeature::GetFieldAsDouble>>,
                 mpl::pair<mpl::int_<OFTRealList>, MemberContainerGetterPtr<double, &OGRFeature::GetFieldAsDoubleList>>,
                 mpl::pair<mpl::int_<OFTString>, MemberGetterPtr<char const*, &OGRFeature::GetFieldAsString, std::string>>,
                 mpl::pair<mpl::int_<OFTStringList>, StringListMemberGetterPtr<std::vector<std::string>>>,
                 mpl::pair<mpl::int_<OFTInteger64>, MemberGetterPtr<GIntBig, &OGRFeature::GetFieldAsInteger64>>,
                 mpl::pair<mpl::int_<OFTInteger64List>, MemberContainerGetterPtr<GIntBig, &OGRFeature::GetFieldAsInteger64List>>>
    FieldGetters_Map;

/**\ingroup GeometryInternals
 * Associative map of OGR field types (\c OGRFieldType) to their associated
 * setters.
 * \internal Relies on Boost.MPL
 * \since OTB v 3.14.0
 */
typedef mpl::map<mpl::pair<mpl::int_<OFTInteger>, MemberSetterPtr<int, &OGRFeature::SetField>>,
                 mpl::pair<mpl::int_<OFTIntegerList>, MemberContainerSetterPtr<int, &OGRFeature::SetField>>,
                 mpl::pair<mpl::int_<OFTReal>, MemberSetterPtr<double, &OGRFeature::SetField>>,
                 mpl::pair<mpl::int_<OFTRealList>, MemberContainerSetterPtr<double, &OGRFeature::SetField>>,
                 mpl::pair<mpl::int_<OFTString>, MemberSetterPtr<char const*, &OGRFeature::SetField /*, std::string*/>>,
                 mpl::pair<mpl::int_<OFTStringList>, StringListMemberSetterPtr<std::vector<std::string>>>,
                 mpl::pair<mpl::int_<OFTInteger64>, MemberSetterPtr<GIntBig, &OGRFeature::SetField>>,
                 mpl::pair<mpl::int_<OFTInteger64List>, MemberContainerSetterPtr<const GIntBig, &OGRFeature::SetField>>>
    FieldSetters_Map;

/**\ingroup GeometryInternals
 * \class CppToOGRConverter_trait
 * \brief Trait class for converting C++ types into OGR field setter compatible types.
 * \tparam T initial C++ type
 * \return C compatible type for OGR API.
 * \note C static arrays become pointers (in order to support literal strings)
 * \note C++ \c std::string becomes <tt>char const*</tt>
 * \since OTB v 3.14.0
 */
template <typename T>
struct CppToOGRConverter_trait
{
  typedef T       type;
  static T const& convert(T const& value)
  {
    return value;
  }
};

/**\ingroup GeometryInternals
 * \brief Specialisation for C static arrays.
 */
template <typename T, std::size_t N>
struct CppToOGRConverter_trait<T[N]>
{
  typedef T*      type;
  static T const* convert(const T value[N])
  {
    return &value[0];
  }
};

/**\ingroup GeometryInternals
 * \brief Specialisation for C++ \c std::string.
 */
template <>
struct CppToOGRConverter_trait<std::string>
{
  typedef char*      type;
  static char const* convert(std::string const& value)
  {
    return value.c_str();
  }
};

} // namespace internal
}
} // end namespace otb::ogr

/*===========================================================================*/
/*=======================[ otb::ogr::Field functions ]=======================*/
/*===========================================================================*/

inline void otb::ogr::Field::CheckInvariants() const
{
  assert(m_Feature && "OGR Fields must be associated to a valid feature");
  assert(m_index < m_Feature->GetFieldCount() && "Out-of-range index for a OGR field");
  assert(m_Feature->GetFieldDefnRef(m_index) && "No definition available for the OGR field");
}

template <typename T>
inline void otb::ogr::Field::SetValue(T const& value)
{
  CheckInvariants();
  typedef internal::CppToOGRConverter_trait<T> Converter;
  typedef typename Converter::type             InterfaceType;
  // uncomment the next line to debug the InterfaceType computed
  // boost::mpl::print<typename internal::CppToOGRConverter_trait<T>::type> interface_type; (void) interface_type;
  BOOST_MPL_ASSERT_MSG(!boost::is_array<InterfaceType>::value, InterFaceType_Cant_Be_An_array, (T, InterfaceType));
  typedef typename boost::mpl::at<internal::FieldType_Map, InterfaceType>::type Kind;
  BOOST_MPL_ASSERT_MSG(!(boost::is_same<Kind, boost::mpl::void_>::value), UNEXPECTED_KIND_TYPE, (T, InterfaceType, Kind));
  // const int VALUE = Kind::value;
  assert(m_Definition.GetType() == Kind::value && "OGR field type mismatches the type of new field value");
  typedef typename boost::mpl::at<internal::FieldSetters_Map, Kind>::type SetterType;
  // If you experience a static assertion failure in the line below, it means
  // the type of the parameter is not supported to set a field.
  BOOST_MPL_ASSERT_NOT((boost::is_same<SetterType, boost::mpl::void_>));
  SetterType::call(*m_Feature, m_index, Converter::convert(value));
}

template <typename T>
inline T otb::ogr::Field::GetValue() const
{
  CheckInvariants();
  assert(HasBeenSet() && "Cannot access the value of a field that hasn't been set");
  typedef typename boost::mpl::at<internal::FieldType_Map, T>::type Kind;
  // const int VALUE = Kind::value;
  BOOST_STATIC_ASSERT(!(boost::is_same<Kind, boost::mpl::void_>::value));
  typedef typename boost::mpl::at<internal::FieldGetters_Map, Kind>::type GetterType;
  // If you experience a static assertion failure in the line below, it means
  // the field cannot be extracted into the type requested.
  BOOST_STATIC_ASSERT(!(boost::is_same<GetterType, boost::mpl::void_>::value));
  return GetterType::call(*m_Feature, m_index);
}

inline std::ostream& otb::ogr::Field::PrintSelf(std::ostream& os, itk::Indent indent) const
{
  CheckInvariants();
  return UncheckedPrintSelf(os, indent);
}

inline bool otb::ogr::Field::HasBeenSet() const
{
  CheckInvariants();
  return UncheckedHasBeenSet();
}

inline void otb::ogr::Field::Unset() const
{
  CheckInvariants();
  UncheckedUnset();
}

inline void otb::ogr::Field::Assign(Field const& f)
{
  CheckInvariants();
  f.CheckInvariants();
  assert(f.GetType() == this->GetType() && "Cannot assign from a field that doesn't have the same definition");
  // We can't assume the following as sometimes field names are altered by the
  // datasource driver; for instance, shp driver truncates field names to 8
  // characters.
  // assert(f.GetDefinition() == this->GetDefinition() && "Cannot assign from a field that doesn't have the same definition");
  UncheckedAssign(f);
  CheckInvariants();
}

inline OGRField& otb::ogr::Field::ogr()
{
  CheckInvariants();
  OGRField* f = m_Feature->GetRawFieldRef(m_index);
  assert(f && "The field obtained shall not be null");
  return *f;
}

inline OGRField& otb::ogr::Field::ogr() const
{
  return const_cast<Field*>(this)->ogr();
}

#endif // otbOGRFieldWrapper_hxx