/******************************************************************************
 *
 * Project:  Hierarchical Data Format Release 5 (HDF5)
 * Purpose:  Header file for HDF5 datasets reader.
 * Author:   Denis Nadeau (denis.nadeau@gmail.com)
 *
 ******************************************************************************
 * Copyright (c) 2005, Frank Warmerdam <warmerdam@pobox.com>
 * Copyright (c) 2013, Even Rouault <even dot rouault at spatialys.com>
 *
 * SPDX-License-Identifier: MIT
 ****************************************************************************/

#ifndef HDF5DATASET_H_INCLUDED_
#define HDF5DATASET_H_INCLUDED_

#include "hdf5_api.h"
#include "hdf5eosparser.h"

#include "cpl_list.h"
#include "gdal_pam.h"

#include <map>

#ifdef ENABLE_HDF5_GLOBAL_LOCK
#include <mutex>
std::recursive_mutex &GetHDF5GlobalMutex();
#define HDF5_GLOBAL_LOCK()                                                     \
    std::lock_guard<std::recursive_mutex> oLock(GetHDF5GlobalMutex())
#else
#define HDF5_GLOBAL_LOCK()                                                     \
    do                                                                         \
    {                                                                          \
    } while (0)
#endif

typedef struct HDF5GroupObjects
{
    char *pszName;
    char *pszPath;
    char *pszUnderscorePath;
    char *pszTemp;
    int nType;
    int nIndex;
    hsize_t nbObjs;
    int nbAttrs;
    int nRank;
    hsize_t *paDims;
    hid_t native;
    hid_t HDatatype;
    unsigned long objno[2];
    struct HDF5GroupObjects *poHparent;
    struct HDF5GroupObjects *poHchild;
} HDF5GroupObjects;

herr_t HDF5CreateGroupObjs(hid_t, const char *, void *);

hid_t HDF5GetFileDriver();
void HDF5UnloadFileDriver();

hid_t GDAL_HDF5Open(const std::string &osFilename);

#if defined(H5_VERSION_GE)  // added in 1.8.7
#if !H5_VERSION_GE(1, 8, 13)
#ifndef _WIN32
#define H5free_memory(x) free(x)
#else
#define H5free_memory(x) CPL_IGNORE_RET_VAL(x)
#endif
#endif
#else
#ifndef _WIN32
#define H5free_memory(x) free(x)
#else
#define H5free_memory(x) CPL_IGNORE_RET_VAL(x)
#endif
#endif

// Release 1.6.3 or 1.6.4 changed the type of count in some API functions.

#if H5_VERS_MAJOR == 1 && H5_VERS_MINOR <= 6 &&                                \
    (H5_VERS_MINOR < 6 || H5_VERS_RELEASE < 3)
#define H5OFFSET_TYPE hssize_t
#else
#define H5OFFSET_TYPE hsize_t
#endif

class HDF5Dataset;
class HDF5EOSParser;
class BAGDataset;
class S100BaseDataset;

namespace GDAL
{
class HDF5Group;

/************************************************************************/
/*                         HDF5SharedResources                          */
/************************************************************************/

class HDF5SharedResources
{
    friend class ::HDF5Dataset;
    friend class ::BAGDataset;
    friend class ::S100BaseDataset;

    std::weak_ptr<HDF5SharedResources> m_poSelf{};
    bool m_bReadOnly = true;
    hid_t m_hHDF5 = 0;
    CPLString m_osFilename{};
    std::shared_ptr<GDALPamMultiDim> m_poPAM{};
    std::unique_ptr<HDF5EOSParser> m_poHDF5EOSParser{};
    std::map<std::string, std::vector<std::shared_ptr<GDALDimension>>>
        m_oMapEOSGridNameToDimensions{};
    std::map<std::string, std::vector<std::shared_ptr<GDALDimension>>>
        m_oMapEOSSwathNameToDimensions{};
    std::map<std::string, std::shared_ptr<GDALMDArray>> m_oRefKeeper;

    explicit HDF5SharedResources(const std::string &osFilename);

  public:
    static std::shared_ptr<HDF5SharedResources>
    Create(const std::string &osFilename);
    ~HDF5SharedResources();

    std::shared_ptr<HDF5Group> GetRootGroup();

    const std::string &GetFilename() const
    {
        return m_osFilename;
    }

    inline hid_t GetHDF5() const
    {
        return m_hHDF5;
    }

    inline bool IsReadOnly() const
    {
        return m_bReadOnly;
    }

    const std::shared_ptr<GDALPamMultiDim> &GetPAM()
    {
        return m_poPAM;
    }

    const HDF5EOSParser *GetHDF5EOSParser() const
    {
        return m_poHDF5EOSParser.get();
    }

    void RegisterEOSGridDimensions(
        const std::string &osGridName,
        const std::vector<std::shared_ptr<GDALDimension>> &apoDims)
    {
        m_oMapEOSGridNameToDimensions[osGridName] = apoDims;
    }

    std::vector<std::shared_ptr<GDALDimension>>
    GetEOSGridDimensions(const std::string &osGridName) const
    {
        auto oIter = m_oMapEOSGridNameToDimensions.find(osGridName);
        if (oIter == m_oMapEOSGridNameToDimensions.end())
            return {};
        return oIter->second;
    }

    void RegisterEOSSwathDimensions(
        const std::string &osSwathName,
        const std::vector<std::shared_ptr<GDALDimension>> &apoDims)
    {
        m_oMapEOSSwathNameToDimensions[osSwathName] = apoDims;
    }

    std::vector<std::shared_ptr<GDALDimension>>
    GetEOSSwathDimensions(const std::string &osSwathName) const
    {
        auto oIter = m_oMapEOSSwathNameToDimensions.find(osSwathName);
        if (oIter == m_oMapEOSSwathNameToDimensions.end())
            return {};
        return oIter->second;
    }

    void KeepRef(const std::shared_ptr<GDALMDArray> &poArray)
    {
        m_oRefKeeper[poArray->GetFullName()] = poArray;
    }
};

}  // namespace GDAL

/************************************************************************/
/* ==================================================================== */
/*                              HDF5Dataset                             */
/* ==================================================================== */
/************************************************************************/
class HDF5Dataset CPL_NON_FINAL : public GDALPamDataset
{
  protected:
    hid_t m_hHDF5 = -1;
    hid_t hGroupID;  // H handler interface.
    char **papszSubDatasets;
    int nDatasetType;
    int nSubDataCount;

    HDF5GroupObjects *poH5RootGroup; /* Contain hdf5 Groups information */
    std::shared_ptr<GDALGroup> m_poRootGroup{};

    CPLStringList m_aosMetadata{};

    HDF5EOSParser m_oHDFEOSParser{};

    CPLErr ReadGlobalAttributes(int);
    CPLErr HDF5ListGroupObjects(HDF5GroupObjects *, int);
    static CPLErr CreateMetadata(hid_t hHDF5, HDF5GroupObjects *, int,
                                 bool bPrefixWithDatasetName,
                                 CPLStringList &aosMetadata);

    HDF5GroupObjects *HDF5FindDatasetObjects(HDF5GroupObjects *, const char *);
    HDF5GroupObjects *HDF5FindDatasetObjectsbyPath(HDF5GroupObjects *,
                                                   const char *);
    char *CreatePath(HDF5GroupObjects *);
    static void DestroyH5Objects(HDF5GroupObjects *);

    /**
     * Reads an array of double attributes from the HDF5 metadata.
     * It reads the attributes directly on its binary form directly,
     * thus avoiding string conversions.
     *
     * Important: It allocates the memory for the attributes internally,
     * so the caller must free the returned array after using it.
     * @param pszAttrName Name of the attribute to be read.
     *                    the attribute name must be the form:
     *                                    root attribute name
     *                                    SUBDATASET/subdataset attribute name
     * @param pdfValues pointer which will store the array of doubles read.
     * @param nLen it stores the length of the array read. If NULL it doesn't
     * inform the length of the array.
     * @return CPLErr CE_None in case of success, CE_Failure in case of failure
     */
    CPLErr HDF5ReadDoubleAttr(const char *pszAttrName, double **pdfValues,
                              int *nLen = nullptr);

  public:
    HDF5Dataset();
    ~HDF5Dataset();

    std::shared_ptr<GDALGroup> GetRootGroup() const override
    {
        return m_poRootGroup;
    }

    static GDALDataset *Open(GDALOpenInfo *);
    static GDALDataset *OpenMultiDim(GDALOpenInfo *);
    static std::shared_ptr<GDALGroup> OpenGroup(
        const std::shared_ptr<GDAL::HDF5SharedResources> &poSharedResources);

    static bool IsNativeCFloat16(hid_t hDataType);
    static const char *GetDataTypeName(hid_t);
    static GDALDataType GetDataType(hid_t);
};

#endif /* HDF5DATASET_H_INCLUDED_ */
