/******************************************************************************
 *
 * Project:  KRO format reader/writer
 * Purpose:  Implementation of KOLOR Raw Format
 * Author:   Even Rouault, <even dot rouault at spatialys.com>
 * Financial Support: SITES (http://www.sites.fr)
 *
 ******************************************************************************
 * Copyright (c) 2014, Even Rouault <even dot rouault at spatialys.com>
 *
 * SPDX-License-Identifier: MIT
 ****************************************************************************/

#include "cpl_string.h"
#include "gdal_frmts.h"
#include "gdal_priv.h"
#include "rawdataset.h"

#include <algorithm>

// http://www.autopano.net/wiki-en/Format_KRO

/************************************************************************/
/* ==================================================================== */
/*                                KRODataset                            */
/* ==================================================================== */
/************************************************************************/

class KRODataset final : public RawDataset
{
    VSILFILE *fpImage = nullptr;  // image data file.

    CPL_DISALLOW_COPY_ASSIGN(KRODataset)

    CPLErr Close() override;

  public:
    KRODataset() = default;
    ~KRODataset() override;

    static GDALDataset *Open(GDALOpenInfo *);
    static GDALDataset *Create(const char *pszFilename, int nXSize, int nYSize,
                               int nBandsIn, GDALDataType eType,
                               char **papszOptions);
    static int Identify(GDALOpenInfo *);
};

/************************************************************************/
/* ==================================================================== */
/*                                  KRODataset                          */
/* ==================================================================== */
/************************************************************************/

/************************************************************************/
/*                             ~KRODataset()                            */
/************************************************************************/

KRODataset::~KRODataset()

{
    KRODataset::Close();
}

/************************************************************************/
/*                              Close()                                 */
/************************************************************************/

CPLErr KRODataset::Close()
{
    CPLErr eErr = CE_None;
    if (nOpenFlags != OPEN_FLAGS_CLOSED)
    {
        if (KRODataset::FlushCache(true) != CE_None)
            eErr = CE_Failure;

        if (fpImage)
        {
            if (VSIFCloseL(fpImage) != 0)
            {
                CPLError(CE_Failure, CPLE_FileIO, "I/O error");
                eErr = CE_Failure;
            }
        }

        if (GDALPamDataset::Close() != CE_None)
            eErr = CE_Failure;
    }
    return eErr;
}

/************************************************************************/
/*                              Identify()                              */
/************************************************************************/

int KRODataset::Identify(GDALOpenInfo *poOpenInfo)

{
    if (poOpenInfo->nHeaderBytes < 20)
        return FALSE;

    if (!STARTS_WITH_CI(reinterpret_cast<char *>(poOpenInfo->pabyHeader),
                        "KRO\x01"))
        return FALSE;

    return TRUE;
}

/************************************************************************/
/*                                Open()                                */
/************************************************************************/

GDALDataset *KRODataset::Open(GDALOpenInfo *poOpenInfo)

{
    if (!Identify(poOpenInfo) || poOpenInfo->fpL == nullptr)
        return nullptr;

    /* -------------------------------------------------------------------- */
    /*      Create a corresponding GDALDataset.                             */
    /* -------------------------------------------------------------------- */
    auto poDS = std::make_unique<KRODataset>();
    poDS->eAccess = poOpenInfo->eAccess;
    std::swap(poDS->fpImage, poOpenInfo->fpL);

    /* -------------------------------------------------------------------- */
    /*      Read the file header.                                           */
    /* -------------------------------------------------------------------- */
    char achHeader[20] = {'\0'};
    CPL_IGNORE_RET_VAL(VSIFReadL(achHeader, 1, 20, poDS->fpImage));

    int nXSize;
    memcpy(&nXSize, achHeader + 4, 4);
    CPL_MSBPTR32(&nXSize);

    int nYSize = 0;
    memcpy(&nYSize, achHeader + 8, 4);
    CPL_MSBPTR32(&nYSize);

    int nDepth = 0;
    memcpy(&nDepth, achHeader + 12, 4);
    CPL_MSBPTR32(&nDepth);

    int nComp = 0;
    memcpy(&nComp, achHeader + 16, 4);
    CPL_MSBPTR32(&nComp);

    if (!GDALCheckDatasetDimensions(nXSize, nYSize) ||
        !GDALCheckBandCount(nComp, FALSE))
    {
        return nullptr;
    }

    poDS->nRasterXSize = nXSize;
    poDS->nRasterYSize = nYSize;

    GDALDataType eDT = GDT_Unknown;
    if (nDepth == 8)
    {
        eDT = GDT_Byte;
    }
    else if (nDepth == 16)
    {
        eDT = GDT_UInt16;
    }
    else if (nDepth == 32)
    {
        eDT = GDT_Float32;
    }
    else
    {
        CPLError(CE_Failure, CPLE_AppDefined, "Unhandled depth : %d", nDepth);
        return nullptr;
    }

    const int nDataTypeSize = nDepth / 8;

    if (nComp == 0 || nDataTypeSize == 0 ||
        poDS->nRasterXSize > INT_MAX / (nComp * nDataTypeSize))
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "Too large width / number of bands");
        return nullptr;
    }

    vsi_l_offset nExpectedSize = static_cast<vsi_l_offset>(poDS->nRasterXSize) *
                                     poDS->nRasterYSize * nComp *
                                     nDataTypeSize +
                                 20;
    VSIFSeekL(poDS->fpImage, 0, SEEK_END);
    if (VSIFTellL(poDS->fpImage) < nExpectedSize)
    {
        CPLError(CE_Failure, CPLE_FileIO, "File too short");
        return nullptr;
    }

    /* -------------------------------------------------------------------- */
    /*      Create bands.                                                   */
    /* -------------------------------------------------------------------- */
    for (int iBand = 0; iBand < nComp; iBand++)
    {
        auto poBand = RawRasterBand::Create(
            poDS.get(), iBand + 1, poDS->fpImage, 20 + nDataTypeSize * iBand,
            nComp * nDataTypeSize, poDS->nRasterXSize * nComp * nDataTypeSize,
            eDT, RawRasterBand::ByteOrder::ORDER_BIG_ENDIAN,
            RawRasterBand::OwnFP::NO);
        if (!poBand)
            return nullptr;
        if (nComp == 3 || nComp == 4)
        {
            poBand->SetColorInterpretation(
                static_cast<GDALColorInterp>(GCI_RedBand + iBand));
        }
        poDS->SetBand(iBand + 1, std::move(poBand));
    }

    if (nComp > 1)
        poDS->SetMetadataItem("INTERLEAVE", "PIXEL", "IMAGE_STRUCTURE");

    /* -------------------------------------------------------------------- */
    /*      Initialize any PAM information.                                 */
    /* -------------------------------------------------------------------- */
    poDS->SetDescription(poOpenInfo->pszFilename);
    poDS->TryLoadXML();

    /* -------------------------------------------------------------------- */
    /*      Check for overviews.                                            */
    /* -------------------------------------------------------------------- */
    poDS->oOvManager.Initialize(poDS.get(), poOpenInfo->pszFilename);

    return poDS.release();
}

/************************************************************************/
/*                               Create()                               */
/************************************************************************/

GDALDataset *KRODataset::Create(const char *pszFilename, int nXSize, int nYSize,
                                int nBandsIn, GDALDataType eType,
                                char ** /* papszOptions */)
{
    if (eType != GDT_Byte && eType != GDT_UInt16 && eType != GDT_Float32)
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "Attempt to create KRO file with unsupported data type '%s'.",
                 GDALGetDataTypeName(eType));
        return nullptr;
    }
    if (nXSize == 0 || nYSize == 0 || nBandsIn == 0)
    {
        return nullptr;
    }

    /* -------------------------------------------------------------------- */
    /*      Try to create file.                                             */
    /* -------------------------------------------------------------------- */
    VSILFILE *fp = VSIFOpenL(pszFilename, "wb");
    if (fp == nullptr)
    {
        CPLError(CE_Failure, CPLE_OpenFailed,
                 "Attempt to create file `%s' failed.", pszFilename);
        return nullptr;
    }

    size_t nRet = VSIFWriteL("KRO\01", 4, 1, fp);

    /* -------------------------------------------------------------------- */
    /*      Create a file level header.                                     */
    /* -------------------------------------------------------------------- */
    int nTmp = nXSize;
    CPL_MSBPTR32(&nTmp);
    nRet += VSIFWriteL(&nTmp, 4, 1, fp);

    nTmp = nYSize;
    CPL_MSBPTR32(&nTmp);
    nRet += VSIFWriteL(&nTmp, 4, 1, fp);

    nTmp = GDALGetDataTypeSizeBits(eType);
    CPL_MSBPTR32(&nTmp);
    nRet += VSIFWriteL(&nTmp, 4, 1, fp);

    nTmp = nBandsIn;
    CPL_MSBPTR32(&nTmp);
    nRet += VSIFWriteL(&nTmp, 4, 1, fp);

    /* -------------------------------------------------------------------- */
    /*      Zero out image data                                             */
    /* -------------------------------------------------------------------- */

    CPL_IGNORE_RET_VAL(VSIFSeekL(fp,
                                 static_cast<vsi_l_offset>(nXSize) * nYSize *
                                         GDALGetDataTypeSizeBytes(eType) *
                                         nBandsIn -
                                     1,
                                 SEEK_CUR));
    GByte byNul = 0;
    nRet += VSIFWriteL(&byNul, 1, 1, fp);
    if (VSIFCloseL(fp) != 0)
    {
        CPLError(CE_Failure, CPLE_FileIO, "I/O error");
        return nullptr;
    }

    if (nRet != 6)
        return nullptr;

    return GDALDataset::FromHandle(GDALOpen(pszFilename, GA_Update));
}

/************************************************************************/
/*                         GDALRegister_KRO()                           */
/************************************************************************/

void GDALRegister_KRO()

{
    if (GDALGetDriverByName("KRO") != nullptr)
        return;

    GDALDriver *poDriver = new GDALDriver();

    poDriver->SetDescription("KRO");
    poDriver->SetMetadataItem(GDAL_DCAP_RASTER, "YES");
    poDriver->SetMetadataItem(GDAL_DMD_LONGNAME, "KOLOR Raw");
    poDriver->SetMetadataItem(GDAL_DMD_EXTENSION, "kro");
    poDriver->SetMetadataItem(GDAL_DCAP_VIRTUALIO, "YES");
    poDriver->SetMetadataItem(GDAL_DMD_CREATIONDATATYPES,
                              "Byte UInt16 Float32");

    poDriver->pfnIdentify = KRODataset::Identify;
    poDriver->pfnOpen = KRODataset::Open;
    poDriver->pfnCreate = KRODataset::Create;

    GetGDALDriverManager()->RegisterDriver(poDriver);
}