/******************************************************************************
 * $Id$
 *
 * Project:  GRIB Driver
 * Purpose:  GDALDataset driver for GRIB translator for read support
 * Author:   Bas Retsios, retsios@itc.nl
 *
 ******************************************************************************
 * Copyright (c) 2007, ITC
 * Copyright (c) 2008-2013, Even Rouault <even dot rouault at spatialys.com>
 *
 * SPDX-License-Identifier: MIT
 ******************************************************************************
 *
 */

#ifndef GRIBDATASET_H
#define GRIBDATASET_H

#include "cpl_port.h"

#include <cerrno>
#include <cmath>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include <time.h>

#include <algorithm>
#include <memory>
#include <string>

#include "cpl_conv.h"
#include "cpl_error.h"
#include "cpl_multiproc.h"
#include "cpl_string.h"
#include "cpl_vsi.h"
#include "degrib/degrib/degrib2.h"
#include "degrib/degrib/inventory.h"
#include "degrib/degrib/meta.h"
#include "degrib/degrib/myerror.h"
#include "degrib/degrib/type.h"
#include "gdal.h"
#include "gdal_frmts.h"
#include "gdal_pam.h"
#include "gdal_priv.h"
#include "ogr_spatialref.h"

/************************************************************************/
/* ==================================================================== */
/*                              GRIBDataset                             */
/* ==================================================================== */
/************************************************************************/

class GRIBArray;
class GRIBRasterBand;

namespace gdal
{
namespace grib
{
class InventoryWrapper;
}
}  // namespace gdal

class GRIBDataset final : public GDALPamDataset
{
    friend class GRIBArray;
    friend class GRIBRasterBand;

  public:
    GRIBDataset();
    ~GRIBDataset();

    static GDALDataset *Open(GDALOpenInfo *);
    static int Identify(GDALOpenInfo *);
    static GDALDataset *CreateCopy(const char *pszFilename,
                                   GDALDataset *poSrcDS, int bStrict,
                                   char **papszOptions,
                                   GDALProgressFunc pfnProgress,
                                   void *pProgressData);

    CPLErr GetGeoTransform(double *padfTransform) override;

    const OGRSpatialReference *GetSpatialRef() const override
    {
        return m_poSRS.get();
    }

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

  private:
    void SetGribMetaData(grib_MetaData *meta);
    static GDALDataset *OpenMultiDim(GDALOpenInfo *);
    std::unique_ptr<gdal::grib::InventoryWrapper> Inventory(GDALOpenInfo *);

    VSILFILE *fp;
    // Calculate and store once as GetGeoTransform may be called multiple times.
    double adfGeoTransform[6];

    GIntBig nCachedBytes;
    GIntBig nCachedBytesThreshold;
    int bCacheOnlyOneBand;

    // Split&Swap: transparent rewrap around the prime meridian instead of the
    // antimeridian rows after nSplitAndSwapColumn are placed at the beginning
    // while rows before are placed at the end
    int nSplitAndSwapColumn;

    GRIBRasterBand *poLastUsedBand;
    std::shared_ptr<GDALGroup> m_poRootGroup{};
    std::shared_ptr<OGRSpatialReference> m_poSRS{};
    std::unique_ptr<OGRSpatialReference> m_poLL{};
    std::unique_ptr<OGRCoordinateTransformation> m_poCT{};

#ifdef BUILD_APPS
    bool m_bSideCarIdxUsed = false;
    bool m_bWarnedGdalinfoNomd = false;
    time_t m_nFirstMetadataQueriedTimeStamp = 0;
    bool m_bWarnedGdalinfoNonodata = false;
    time_t m_nFirstNodataQueriedTimeStamp = 0;
#endif
};

/************************************************************************/
/* ==================================================================== */
/*                            GRIBRasterBand                             */
/* ==================================================================== */
/************************************************************************/

class GRIBRasterBand final : public GDALPamRasterBand
{
    friend class GRIBArray;
    friend class GRIBDataset;

  public:
    GRIBRasterBand(GRIBDataset *, int, inventoryType *);
    virtual ~GRIBRasterBand();
    virtual CPLErr IReadBlock(int, int, void *) override;
    virtual const char *GetDescription() const override;

    virtual double GetNoDataValue(int *pbSuccess = nullptr) override;
    virtual char **GetMetadata(const char *pszDomain = "") override;
    virtual const char *GetMetadataItem(const char *pszName,
                                        const char *pszDomain = "") override;

    void FindPDSTemplateGRIB2();

    void UncacheData();

    static void ReadGribData(VSILFILE *, vsi_l_offset, int, double **,
                             grib_MetaData **);

  private:
    CPLErr LoadData();
    void FindNoDataGrib2(bool bSeekToStart = true);
    void FindMetaData();
    // Heuristic search for the start of the message
    static vsi_l_offset FindTrueStart(VSILFILE *, vsi_l_offset);

    vsi_l_offset start;
    int subgNum;
    char *longFstLevel;

    double *m_Grib_Data;
    grib_MetaData *m_Grib_MetaData;

    int nGribDataXSize;
    int nGribDataYSize;
    int m_nGribVersion;

    bool m_bHasLookedForNoData;
    double m_dfNoData;
    bool m_bHasNoData;

    int m_nDisciplineCode = -1;
    std::string m_osDisciplineName{};
    int m_nCenter = -1;
    std::string m_osCenterName{};
    int m_nSubCenter = -1;
    std::string m_osSubCenterName{};
    std::string m_osSignRefTimeName{};
    std::string m_osRefTime{};
    std::string m_osProductionStatus{};
    std::string m_osType{};
    int m_nPDTN = -1;
    std::vector<GUInt32> m_anPDSTemplateAssembledValues{};
    bool bLoadedPDS = false;
    bool bLoadedMetadata = false;
};

namespace gdal
{
namespace grib
{

// Thin layer to manage allocation and deallocation.
class InventoryWrapper
{
  public:
    InventoryWrapper()
    {
    }

    virtual ~InventoryWrapper()
    {
    }

    // Modifying the contents pointed to by the return is allowed.
    inventoryType *get(int i) const
    {
        if (i < 0 || i >= static_cast<int>(inv_len_))
            return nullptr;
        return inv_ + i;
    }

    uInt4 length() const
    {
        return inv_len_;
    }

    size_t num_messages() const
    {
        return num_messages_;
    }

    int result() const
    {
        return result_;
    }

  protected:
    inventoryType *inv_ = nullptr;
    uInt4 inv_len_ = 0;
    int num_messages_ = 0;
    int result_ = 0;
};

}  // namespace grib
}  // namespace gdal

const char *const apszJ2KDrivers[] = {"JP2KAK", "JP2OPENJPEG", "JPEG2000",
                                      "JP2ECW"};

#endif  // GRIBDATASET_H