/******************************************************************************
 *
 * Project:  ESRI .hdr Driver
 * Purpose:  Implementation of EHdrDataset
 * Author:   Frank Warmerdam, warmerdam@pobox.com
 *
 ******************************************************************************
 * Copyright (c) 1999, Frank Warmerdam <warmerdam@pobox.com>
 * Copyright (c) 2007-2013, Even Rouault <even dot rouault at spatialys.com>
 *
 * SPDX-License-Identifier: MIT
 ****************************************************************************/

#ifndef GDAL_FRMTS_RAW_EHDRDATASET_H_INCLUDED
#define GDAL_FRMTS_RAW_EHDRDATASET_H_INCLUDED

#include "cpl_port.h"
#include "rawdataset.h"

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

#include <limits>
#include <memory>

#include "cpl_conv.h"
#include "cpl_error.h"
#include "cpl_progress.h"
#include "cpl_string.h"
#include "cpl_vsi.h"
#include "gdal.h"
#include "gdal_frmts.h"
#include "gdal_pam.h"
#include "gdal_priv.h"
#include "gdal_rat.h"
#include "ogr_core.h"
#include "ogr_spatialref.h"

/************************************************************************/
/* ==================================================================== */
/*                       EHdrDataset                                    */
/* ==================================================================== */
/************************************************************************/

class EHdrRasterBand;

class EHdrDataset final : public RawDataset
{
    friend class EHdrRasterBand;

    VSILFILE *fpImage;  // image data file.

    CPLString osHeaderExt{};

    bool bGotTransform{};
    double adfGeoTransform[6]{0, 1, 0, 0, 0, 1};
    OGRSpatialReference m_oSRS{};

    bool bHDRDirty{};
    char **papszHDR{};

    bool bCLRDirty{};
    std::shared_ptr<GDALColorTable> m_poColorTable{};
    std::shared_ptr<GDALRasterAttributeTable> m_poRAT{};

    CPLErr ReadSTX() const;
    CPLErr RewriteSTX() const;
    CPLErr RewriteHDR();
    void ResetKeyValue(const char *pszKey, const char *pszValue);
    const char *GetKeyValue(const char *pszKey, const char *pszDefault = "");
    void RewriteCLR(GDALRasterBand *) const;

    CPL_DISALLOW_COPY_ASSIGN(EHdrDataset)

    CPLErr Close() override;

  public:
    EHdrDataset();
    ~EHdrDataset() override;

    CPLErr GetGeoTransform(double *padfTransform) override;
    CPLErr SetGeoTransform(double *padfTransform) override;

    const OGRSpatialReference *GetSpatialRef() const override
    {
        return m_oSRS.IsEmpty() ? RawDataset::GetSpatialRef() : &m_oSRS;
    }

    CPLErr SetSpatialRef(const OGRSpatialReference *poSRS) override;

    char **GetFileList() override;

    static GDALDataset *Open(GDALOpenInfo *);
    static GDALDataset *Open(GDALOpenInfo *, bool bFileSizeCheck);
    static GDALDataset *Create(const char *pszFilename, int nXSize, int nYSize,
                               int nBands, GDALDataType eType,
                               char **papszParamList);
    static GDALDataset *CreateCopy(const char *pszFilename,
                                   GDALDataset *poSrcDS, int bStrict,
                                   char **papszOptions,
                                   GDALProgressFunc pfnProgress,
                                   void *pProgressData);
    static CPLString GetImageRepFilename(const char *pszFilename);
};

/************************************************************************/
/* ==================================================================== */
/*                          EHdrRasterBand                              */
/* ==================================================================== */
/************************************************************************/

class EHdrRasterBand final : public RawRasterBand
{
    friend class EHdrDataset;

    std::shared_ptr<GDALColorTable> m_poColorTable{};
    std::shared_ptr<GDALRasterAttributeTable> m_poRAT{};

    bool m_bValid = false;
    int nBits{};
    vsi_l_offset nStartBit{};
    int nPixelOffsetBits{};
    vsi_l_offset nLineOffsetBits{};

    int bNoDataSet{};  // TODO(schwehr): Convert to bool.
    double dfNoData{};
    double dfMin{};
    double dfMax{};
    double dfMean{};
    double dfStdDev{};

    int minmaxmeanstddev{};

    CPLErr IRasterIO(GDALRWFlag, int, int, int, int, void *, int, int,
                     GDALDataType, GSpacing nPixelSpace, GSpacing nLineSpace,
                     GDALRasterIOExtraArg *psExtraArg) override;

    CPL_DISALLOW_COPY_ASSIGN(EHdrRasterBand)

  public:
    EHdrRasterBand(GDALDataset *poDS, int nBand, VSILFILE *fpRaw,
                   vsi_l_offset nImgOffset, int nPixelOffset, int nLineOffset,
                   GDALDataType eDataType,
                   RawRasterBand::ByteOrder eByteOrderIn, int nBits);

    bool IsValid() const
    {
        return m_bValid;
    }

    CPLErr IReadBlock(int, int, void *) override;
    CPLErr IWriteBlock(int, int, void *) override;

    double GetNoDataValue(int *pbSuccess = nullptr) override;
    double GetMinimum(int *pbSuccess = nullptr) override;
    double GetMaximum(int *pbSuccess = nullptr) override;
    CPLErr GetStatistics(int bApproxOK, int bForce, double *pdfMin,
                         double *pdfMax, double *pdfMean,
                         double *pdfStdDev) override;
    CPLErr SetStatistics(double dfMin, double dfMax, double dfMean,
                         double dfStdDev) override;
    CPLErr SetColorTable(GDALColorTable *poNewCT) override;
    GDALColorTable *GetColorTable() override;

    GDALRasterAttributeTable *GetDefaultRAT() override;
    CPLErr SetDefaultRAT(const GDALRasterAttributeTable *poRAT) override;
};

#endif  // GDAL_FRMTS_RAW_EHDRDATASET_H_INCLUDED