/*
 *  keadataset.cpp
 *
 *  Created by Pete Bunting on 01/08/2012.
 *  Copyright 2012 LibKEA. All rights reserved.
 *
 *  This file is part of LibKEA.
 *
 *  Permission is hereby granted, free of charge, to any person
 *  obtaining a copy of this software and associated documentation
 *  files (the "Software"), to deal in the Software without restriction,
 *  including without limitation the rights to use, copy, modify,
 *  merge, publish, distribute, sublicense, and/or sell copies of the
 *  Software, and to permit persons to whom the Software is furnished
 *  to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be
 *  included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 *  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 *  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
 *  ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
 *  CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#include "keadataset.h"
#include "keaband.h"
#include "keacopy.h"
#include "../frmts/hdf5/hdf5vfl.h"
#include "cpl_vsi_virtual.h"

/************************************************************************/
/*                     KEADatasetDriverUnload()                        */
/************************************************************************/

void KEADatasetDriverUnload(GDALDriver *)
{
    HDF5VFLUnloadFileDriver();
}

// Function for converting a libkea type into a GDAL type
GDALDataType KEA_to_GDAL_Type(kealib::KEADataType ekeaType)
{
    GDALDataType egdalType = GDT_Unknown;
    switch (ekeaType)
    {
        case kealib::kea_8int:
            egdalType = GDT_Int8;
            break;
        case kealib::kea_8uint:
            egdalType = GDT_Byte;
            break;
        case kealib::kea_16int:
            egdalType = GDT_Int16;
            break;
        case kealib::kea_32int:
            egdalType = GDT_Int32;
            break;
        case kealib::kea_64int:
            egdalType = GDT_Int64;
            break;
        case kealib::kea_16uint:
            egdalType = GDT_UInt16;
            break;
        case kealib::kea_32uint:
            egdalType = GDT_UInt32;
            break;
        case kealib::kea_64uint:
            egdalType = GDT_UInt64;
            break;
        case kealib::kea_32float:
            egdalType = GDT_Float32;
            break;
        case kealib::kea_64float:
            egdalType = GDT_Float64;
            break;
        default:
            egdalType = GDT_Unknown;
            break;
    }
    return egdalType;
}

// function for converting a GDAL type to a kealib type
kealib::KEADataType GDAL_to_KEA_Type(GDALDataType egdalType)
{
    kealib::KEADataType ekeaType = kealib::kea_undefined;
    switch (egdalType)
    {
        case GDT_Int8:
            ekeaType = kealib::kea_8int;
            break;
        case GDT_Byte:
            ekeaType = kealib::kea_8uint;
            break;
        case GDT_Int16:
            ekeaType = kealib::kea_16int;
            break;
        case GDT_Int32:
            ekeaType = kealib::kea_32int;
            break;
        case GDT_Int64:
            ekeaType = kealib::kea_64int;
            break;
        case GDT_UInt16:
            ekeaType = kealib::kea_16uint;
            break;
        case GDT_UInt32:
            ekeaType = kealib::kea_32uint;
            break;
        case GDT_UInt64:
            ekeaType = kealib::kea_64uint;
            break;
        case GDT_Float32:
            ekeaType = kealib::kea_32float;
            break;
        case GDT_Float64:
            ekeaType = kealib::kea_64float;
            break;
        default:
            ekeaType = kealib::kea_undefined;
            break;
    }
    return ekeaType;
}

// static function - pointer set in driver
GDALDataset *KEADataset::Open(GDALOpenInfo *poOpenInfo)
{
    if (Identify(poOpenInfo))
    {
        try
        {
            // try and open it in the appropriate mode
            H5::H5File *pH5File;
            if (poOpenInfo->eAccess == GA_ReadOnly)
            {
                // use the virtual driver so we can open files using
                // /vsicurl etc
                // do this same as libkea
                H5::FileAccPropList keaAccessPlist =
                    H5::FileAccPropList(H5::FileAccPropList::DEFAULT);
                keaAccessPlist.setCache(
                    kealib::KEA_MDC_NELMTS, kealib::KEA_RDCC_NELMTS,
                    kealib::KEA_RDCC_NBYTES, kealib::KEA_RDCC_W0);
                keaAccessPlist.setSieveBufSize(kealib::KEA_SIEVE_BUF);
                hsize_t blockSize = kealib::KEA_META_BLOCKSIZE;
                keaAccessPlist.setMetaBlockSize(blockSize);
                // but set the driver
                keaAccessPlist.setDriver(HDF5VFLGetFileDriver(), nullptr);

                const H5std_string keaImgFilePath(poOpenInfo->pszFilename);
                pH5File = new H5::H5File(keaImgFilePath, H5F_ACC_RDONLY,
                                         H5::FileCreatPropList::DEFAULT,
                                         keaAccessPlist);
            }
            else
            {
                // Must be a local file
                pH5File =
                    kealib::KEAImageIO::openKeaH5RW(poOpenInfo->pszFilename);
            }
            // create the KEADataset object
            KEADataset *pDataset = new KEADataset(pH5File, poOpenInfo->eAccess);

            // set the description as the name
            pDataset->SetDescription(poOpenInfo->pszFilename);

            return pDataset;
        }
        catch (const kealib::KEAIOException &e)
        {
            // was a problem - can't be a valid file
            CPLError(CE_Failure, CPLE_OpenFailed,
                     "Attempt to open file `%s' failed. Error: %s\n",
                     poOpenInfo->pszFilename, e.what());
            return nullptr;
        }
        catch (...)
        {
            // was a problem - can't be a valid file
            CPLError(CE_Failure, CPLE_OpenFailed,
                     "Attempt to open file `%s' failed. Error: unknown\n",
                     poOpenInfo->pszFilename);
            return nullptr;
        }
    }
    else
    {
        // not a KEA file
        return nullptr;
    }
}

// static function- pointer set in driver
// this function is called in preference to Open
//
int KEADataset::Identify(GDALOpenInfo *poOpenInfo)
{

    /* -------------------------------------------------------------------- */
    /*      Is it an HDF5 file?                                             */
    /* -------------------------------------------------------------------- */
    static const char achSignature[] = "\211HDF\r\n\032\n";

    if (poOpenInfo->pabyHeader == nullptr ||
        memcmp(poOpenInfo->pabyHeader, achSignature, 8) != 0)
    {
        return 0;
    }

    // avoid using kealib::KEAImageIO::isKEAImage as this is likely
    // to be too slow over curl etc (and doesn't take a HDF5 file handle
    // anyway).
    // Just test the extension
    CPLString osExt(CPLGetExtension(poOpenInfo->pszFilename));
    if (EQUAL(osExt, "KEA"))
        return 1;
    else
        return 0;
}

// static function
H5::H5File *KEADataset::CreateLL(const char *pszFilename, int nXSize,
                                 int nYSize, int nBandsIn, GDALDataType eType,
                                 char **papszParamList)
{
    GDALDriverH hDriver = GDALGetDriverByName("KEA");
    if ((hDriver == nullptr) ||
        !GDALValidateCreationOptions(hDriver, papszParamList))
    {
        CPLError(
            CE_Failure, CPLE_OpenFailed,
            "Attempt to create file `%s' failed. Invalid creation option(s)\n",
            pszFilename);
        return nullptr;
    }

    // This helps avoiding issues with H5File handles in a bad state, that
    // may cause crashes at process termination
    // Cf https://github.com/OSGeo/gdal/issues/8743
    if (VSIFileManager::GetHandler(pszFilename) !=
        VSIFileManager::GetHandler(""))
    {
        CPLError(CE_Failure, CPLE_OpenFailed,
                 "Attempt to create file `%s' failed. /vsi file systems not "
                 "supported\n",
                 pszFilename);
        return nullptr;
    }

    // process any creation options in papszParamList
    // default value
    unsigned int nimageblockSize = kealib::KEA_IMAGE_CHUNK_SIZE;
    // see if they have provided a different value
    const char *pszValue = CSLFetchNameValue(papszParamList, "IMAGEBLOCKSIZE");
    if (pszValue != nullptr)
        nimageblockSize = (unsigned int)atol(pszValue);

    unsigned int nattblockSize = kealib::KEA_ATT_CHUNK_SIZE;
    pszValue = CSLFetchNameValue(papszParamList, "ATTBLOCKSIZE");
    if (pszValue != nullptr)
        nattblockSize = (unsigned int)atol(pszValue);

    unsigned int nmdcElmts = kealib::KEA_MDC_NELMTS;
    pszValue = CSLFetchNameValue(papszParamList, "MDC_NELMTS");
    if (pszValue != nullptr)
        nmdcElmts = (unsigned int)atol(pszValue);

    hsize_t nrdccNElmts = kealib::KEA_RDCC_NELMTS;
    pszValue = CSLFetchNameValue(papszParamList, "RDCC_NELMTS");
    if (pszValue != nullptr)
        nrdccNElmts = (unsigned int)atol(pszValue);

    hsize_t nrdccNBytes = kealib::KEA_RDCC_NBYTES;
    pszValue = CSLFetchNameValue(papszParamList, "RDCC_NBYTES");
    if (pszValue != nullptr)
        nrdccNBytes = (unsigned int)atol(pszValue);

    double nrdccW0 = kealib::KEA_RDCC_W0;
    pszValue = CSLFetchNameValue(papszParamList, "RDCC_W0");
    if (pszValue != nullptr)
        nrdccW0 = CPLAtof(pszValue);

    hsize_t nsieveBuf = kealib::KEA_SIEVE_BUF;
    pszValue = CSLFetchNameValue(papszParamList, "SIEVE_BUF");
    if (pszValue != nullptr)
        nsieveBuf = (unsigned int)atol(pszValue);

    hsize_t nmetaBlockSize = kealib::KEA_META_BLOCKSIZE;
    pszValue = CSLFetchNameValue(papszParamList, "META_BLOCKSIZE");
    if (pszValue != nullptr)
        nmetaBlockSize = (unsigned int)atol(pszValue);

    unsigned int ndeflate = kealib::KEA_DEFLATE;
    pszValue = CSLFetchNameValue(papszParamList, "DEFLATE");
    if (pszValue != nullptr)
        ndeflate = (unsigned int)atol(pszValue);

    kealib::KEADataType keaDataType = GDAL_to_KEA_Type(eType);
    if (nBandsIn > 0 && keaDataType == kealib::kea_undefined)
    {
        CPLError(CE_Failure, CPLE_NotSupported,
                 "Data type %s not supported in KEA",
                 GDALGetDataTypeName(eType));
        return nullptr;
    }

    try
    {
        // now create it
        H5::H5File *keaImgH5File = kealib::KEAImageIO::createKEAImage(
            pszFilename, keaDataType, nXSize, nYSize, nBandsIn, nullptr,
            nullptr, nimageblockSize, nattblockSize, nmdcElmts, nrdccNElmts,
            nrdccNBytes, nrdccW0, nsieveBuf, nmetaBlockSize, ndeflate);
        return keaImgH5File;
    }
    catch (kealib::KEAIOException &e)
    {
        CPLError(CE_Failure, CPLE_OpenFailed,
                 "Attempt to create file `%s' failed. Error: %s\n", pszFilename,
                 e.what());
        return nullptr;
    }
    catch (...)
    {
        CPLError(CE_Failure, CPLE_OpenFailed,
                 "Attempt to create file `%s' failed. Error: unknown\n",
                 pszFilename);
        return nullptr;
    }
}

// static function- pointer set in driver
GDALDataset *KEADataset::Create(const char *pszFilename, int nXSize, int nYSize,
                                int nBandsIn, GDALDataType eType,
                                char **papszParamList)
{
    H5::H5File *keaImgH5File =
        CreateLL(pszFilename, nXSize, nYSize, nBandsIn, eType, papszParamList);
    if (keaImgH5File == nullptr)
        return nullptr;

    bool bThematic =
        CPLTestBool(CSLFetchNameValueDef(papszParamList, "THEMATIC", "FALSE"));

    try
    {
        // create our dataset object
        KEADataset *pDataset = new KEADataset(keaImgH5File, GA_Update);

        pDataset->SetDescription(pszFilename);

        // set all to thematic if asked
        if (bThematic)
        {
            for (int nCount = 0; nCount < nBandsIn; nCount++)
            {
                GDALRasterBand *pBand = pDataset->GetRasterBand(nCount + 1);
                pBand->SetMetadataItem("LAYER_TYPE", "thematic");
            }
        }

        return pDataset;
    }
    catch (kealib::KEAIOException &e)
    {
        CPLError(CE_Failure, CPLE_OpenFailed,
                 "Attempt to create file `%s' failed. Error: %s\n", pszFilename,
                 e.what());
        return nullptr;
    }
}

GDALDataset *KEADataset::CreateCopy(const char *pszFilename,
                                    GDALDataset *pSrcDs, CPL_UNUSED int bStrict,
                                    char **papszParamList,
                                    GDALProgressFunc pfnProgress,
                                    void *pProgressData)
{
    // get the data out of the input dataset
    int nXSize = pSrcDs->GetRasterXSize();
    int nYSize = pSrcDs->GetRasterYSize();
    int nBands = pSrcDs->GetRasterCount();

    GDALDataType eType = (nBands == 0)
                             ? GDT_Unknown
                             : pSrcDs->GetRasterBand(1)->GetRasterDataType();
    H5::H5File *keaImgH5File =
        CreateLL(pszFilename, nXSize, nYSize, nBands, eType, papszParamList);
    if (keaImgH5File == nullptr)
        return nullptr;

    bool bThematic =
        CPLTestBool(CSLFetchNameValueDef(papszParamList, "THEMATIC", "FALSE"));

    try
    {
        // create the imageio
        kealib::KEAImageIO *pImageIO = new kealib::KEAImageIO();

        // open the file
        pImageIO->openKEAImageHeader(keaImgH5File);

        // copy file
        if (!KEACopyFile(pSrcDs, pImageIO, pfnProgress, pProgressData))
        {
            delete pImageIO;
            return nullptr;
        }

        // close it
        try
        {
            pImageIO->close();
        }
        catch (const kealib::KEAIOException &)
        {
        }
        delete pImageIO;

        // now open it again - because the constructor loads all the info
        // in we need to copy the data first....
        keaImgH5File = kealib::KEAImageIO::openKeaH5RW(pszFilename);

        // and wrap it in a dataset
        KEADataset *pDataset = new KEADataset(keaImgH5File, GA_Update);
        pDataset->SetDescription(pszFilename);

        // set all to thematic if asked - overrides whatever set by CopyFile
        if (bThematic)
        {
            for (int nCount = 0; nCount < nBands; nCount++)
            {
                GDALRasterBand *pBand = pDataset->GetRasterBand(nCount + 1);
                pBand->SetMetadataItem("LAYER_TYPE", "thematic");
            }
        }

        for (int nCount = 0; nCount < nBands; nCount++)
        {
            pDataset->GetRasterBand(nCount + 1)
                ->SetColorInterpretation(pSrcDs->GetRasterBand(nCount + 1)
                                             ->GetColorInterpretation());
        }

        // KEA has no concept of per-dataset mask band for now.
        for (int nCount = 0; nCount < nBands; nCount++)
        {
            if (pSrcDs->GetRasterBand(nCount + 1)->GetMaskFlags() ==
                0)  // Per-band mask
            {
                pDataset->GetRasterBand(nCount + 1)->CreateMaskBand(0);
                if (GDALRasterBandCopyWholeRaster(
                        (GDALRasterBandH)pSrcDs->GetRasterBand(nCount + 1)
                            ->GetMaskBand(),
                        (GDALRasterBandH)pDataset->GetRasterBand(nCount + 1)
                            ->GetMaskBand(),
                        nullptr, nullptr, nullptr) != CE_None)
                {
                    delete pDataset;
                    return nullptr;
                }
            }
        }

        return pDataset;
    }
    catch (kealib::KEAException &e)
    {
        CPLError(CE_Failure, CPLE_OpenFailed,
                 "Attempt to create file `%s' failed. Error: %s\n", pszFilename,
                 e.what());
        return nullptr;
    }
}

// constructor
KEADataset::KEADataset(H5::H5File *keaImgH5File, GDALAccess eAccessIn)
{
    this->m_hMutex = CPLCreateMutex();
    CPLReleaseMutex(this->m_hMutex);
    try
    {
        // Create the image IO and initialize the refcount.
        m_pImageIO = new kealib::KEAImageIO();
        m_pRefcount = new LockedRefCount();

        // NULL until we read them in.
        m_papszMetadataList = nullptr;
        m_pGCPs = nullptr;

        // open the file
        m_pImageIO->openKEAImageHeader(keaImgH5File);
        kealib::KEAImageSpatialInfo *pSpatialInfo =
            m_pImageIO->getSpatialInfo();

        // get the dimensions
        this->nBands = m_pImageIO->getNumOfImageBands();
        this->nRasterXSize = static_cast<int>(pSpatialInfo->xSize);
        this->nRasterYSize = static_cast<int>(pSpatialInfo->ySize);
        this->eAccess = eAccessIn;

        // create all the bands
        for (int nCount = 0; nCount < nBands; nCount++)
        {
            // Note: GDAL uses indices starting at 1 and so does kealib.
            // Create band object.
            KEARasterBand *pBand = new KEARasterBand(this, nCount + 1, eAccess,
                                                     m_pImageIO, m_pRefcount);
            // read in overviews
            pBand->readExistingOverviews();
            // set the band into this dataset
            this->SetBand(nCount + 1, pBand);
        }

        // read in the metadata
        this->UpdateMetadataList();
    }
    catch (const kealib::KEAIOException &e)
    {
        // ignore?
        CPLError(CE_Warning, CPLE_AppDefined,
                 "Caught exception in KEADataset constructor %s", e.what());
    }
}

KEADataset::~KEADataset()
{
    {
        CPLMutexHolderD(&m_hMutex);
        // destroy the metadata
        CSLDestroy(m_papszMetadataList);
        this->DestroyGCPs();
    }
    if (m_pRefcount->DecRef())
    {
        try
        {
            m_pImageIO->close();
        }
        catch (const kealib::KEAIOException &)
        {
        }
        delete m_pImageIO;
        delete m_pRefcount;
    }

    CPLDestroyMutex(m_hMutex);
    m_hMutex = nullptr;
}

// read in the metadata into our CSLStringList
void KEADataset::UpdateMetadataList()
{
    CPLMutexHolderD(&m_hMutex);
    std::vector<std::pair<std::string, std::string>> odata;
    // get all the metadata
    odata = this->m_pImageIO->getImageMetaData();
    for (std::vector<std::pair<std::string, std::string>>::iterator
             iterMetaData = odata.begin();
         iterMetaData != odata.end(); ++iterMetaData)
    {
        m_papszMetadataList =
            CSLSetNameValue(m_papszMetadataList, iterMetaData->first.c_str(),
                            iterMetaData->second.c_str());
    }
}

// read in the geotransform
CPLErr KEADataset::GetGeoTransform(double *padfTransform)
{
    try
    {
        kealib::KEAImageSpatialInfo *pSpatialInfo =
            m_pImageIO->getSpatialInfo();
        // GDAL uses an array format
        padfTransform[0] = pSpatialInfo->tlX;
        padfTransform[1] = pSpatialInfo->xRes;
        padfTransform[2] = pSpatialInfo->xRot;
        padfTransform[3] = pSpatialInfo->tlY;
        padfTransform[4] = pSpatialInfo->yRot;
        padfTransform[5] = pSpatialInfo->yRes;

        return CE_None;
    }
    catch (const kealib::KEAIOException &e)
    {
        CPLError(CE_Warning, CPLE_AppDefined, "Unable to read geotransform: %s",
                 e.what());
        return CE_Failure;
    }
}

// read in the projection ref
const OGRSpatialReference *KEADataset::GetSpatialRef() const
{
    if (!m_oSRS.IsEmpty())
        return &m_oSRS;

    try
    {
        kealib::KEAImageSpatialInfo *pSpatialInfo =
            m_pImageIO->getSpatialInfo();
        m_oSRS.SetAxisMappingStrategy(OAMS_TRADITIONAL_GIS_ORDER);
        m_oSRS.importFromWkt(pSpatialInfo->wktString.c_str());
        return m_oSRS.IsEmpty() ? nullptr : &m_oSRS;
    }
    catch (const kealib::KEAIOException &)
    {
        return nullptr;
    }
}

// set the geotransform
CPLErr KEADataset::SetGeoTransform(double *padfTransform)
{
    try
    {
        // get the spatial info and update it
        kealib::KEAImageSpatialInfo *pSpatialInfo =
            m_pImageIO->getSpatialInfo();
        // convert back from GDAL's array format
        pSpatialInfo->tlX = padfTransform[0];
        pSpatialInfo->xRes = padfTransform[1];
        pSpatialInfo->xRot = padfTransform[2];
        pSpatialInfo->tlY = padfTransform[3];
        pSpatialInfo->yRot = padfTransform[4];
        pSpatialInfo->yRes = padfTransform[5];

        m_pImageIO->setSpatialInfo(pSpatialInfo);
        return CE_None;
    }
    catch (const kealib::KEAIOException &e)
    {
        CPLError(CE_Warning, CPLE_AppDefined,
                 "Unable to write geotransform: %s", e.what());
        return CE_Failure;
    }
}

// set the projection
CPLErr KEADataset::SetSpatialRef(const OGRSpatialReference *poSRS)
{
    try
    {
        // get the spatial info and update it
        kealib::KEAImageSpatialInfo *pSpatialInfo =
            m_pImageIO->getSpatialInfo();

        m_oSRS.Clear();
        if (poSRS)
        {
            m_oSRS = *poSRS;
            char *pszWKT = nullptr;
            m_oSRS.exportToWkt(&pszWKT);
            pSpatialInfo->wktString = pszWKT ? pszWKT : "";
            CPLFree(pszWKT);
        }
        else
        {
            pSpatialInfo->wktString.clear();
        }

        m_pImageIO->setSpatialInfo(pSpatialInfo);
        return CE_None;
    }
    catch (const kealib::KEAIOException &e)
    {
        CPLError(CE_Warning, CPLE_AppDefined, "Unable to write projection: %s",
                 e.what());
        return CE_Failure;
    }
}

// Thought this might be handy to pass back to the application
void *KEADataset::GetInternalHandle(const char *)
{
    return m_pImageIO;
}

// this is called by GDALDataset::BuildOverviews. we implement this function to
// support building of overviews
CPLErr KEADataset::IBuildOverviews(const char *pszResampling, int nOverviews,
                                   const int *panOverviewList, int nListBands,
                                   const int *panBandList,
                                   GDALProgressFunc pfnProgress,
                                   void *pProgressData,
                                   CSLConstList papszOptions)
{
    // go through the list of bands that have been passed in
    int nCurrentBand, nOK = 1;
    for (int nBandCount = 0; (nBandCount < nListBands) && nOK; nBandCount++)
    {
        // get the band number
        nCurrentBand = panBandList[nBandCount];
        // get the band
        KEARasterBand *pBand =
            (KEARasterBand *)this->GetRasterBand(nCurrentBand);
        // create the overview object
        pBand->CreateOverviews(nOverviews, panOverviewList);

        // get GDAL to do the hard work. It will calculate the overviews and
        // write them back into the objects
        if (GDALRegenerateOverviewsEx(
                (GDALRasterBandH)pBand, nOverviews,
                (GDALRasterBandH *)pBand->GetOverviewList(), pszResampling,
                pfnProgress, pProgressData, papszOptions) != CE_None)
        {
            nOK = 0;
        }
    }
    if (!nOK)
    {
        return CE_Failure;
    }
    else
    {
        return CE_None;
    }
}

// set a single metadata item
CPLErr KEADataset::SetMetadataItem(const char *pszName, const char *pszValue,
                                   const char *pszDomain)
{
    CPLMutexHolderD(&m_hMutex);
    // only deal with 'default' domain - no geolocation etc
    if ((pszDomain != nullptr) && (*pszDomain != '\0'))
        return CE_Failure;

    try
    {
        this->m_pImageIO->setImageMetaData(pszName, pszValue);
        // CSLSetNameValue will update if already there
        m_papszMetadataList =
            CSLSetNameValue(m_papszMetadataList, pszName, pszValue);
        return CE_None;
    }
    catch (const kealib::KEAIOException &e)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "Unable to write metadata: %s",
                 e.what());
        return CE_Failure;
    }
}

// get a single metadata item
const char *KEADataset::GetMetadataItem(const char *pszName,
                                        const char *pszDomain)
{
    CPLMutexHolderD(&m_hMutex);
    // only deal with 'default' domain - no geolocation etc
    if ((pszDomain != nullptr) && (*pszDomain != '\0'))
        return nullptr;
    // string returned from CSLFetchNameValue should be persistent
    return CSLFetchNameValue(m_papszMetadataList, pszName);
}

// get the whole metadata as CSLStringList - note may be thread safety issues
char **KEADataset::GetMetadata(const char *pszDomain)
{
    // only deal with 'default' domain - no geolocation etc
    if ((pszDomain != nullptr) && (*pszDomain != '\0'))
        return nullptr;
    // this is what we store it as anyway
    return m_papszMetadataList;
}

// set the whole metadata as a CSLStringList
CPLErr KEADataset::SetMetadata(char **papszMetadata, const char *pszDomain)
{
    CPLMutexHolderD(&m_hMutex);
    // only deal with 'default' domain - no geolocation etc
    if ((pszDomain != nullptr) && (*pszDomain != '\0'))
        return CE_Failure;

    int nIndex = 0;
    try
    {
        // go through each item
        while (papszMetadata[nIndex] != nullptr)
        {
            // get the value/name
            char *pszName = nullptr;
            const char *pszValue =
                CPLParseNameValue(papszMetadata[nIndex], &pszName);
            if (pszValue == nullptr)
                pszValue = "";
            if (pszName != nullptr)
            {
                // set it with imageio
                this->m_pImageIO->setImageMetaData(pszName, pszValue);
                CPLFree(pszName);
            }
            nIndex++;
        }
    }
    catch (const kealib::KEAIOException &e)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "Unable to write metadata: %s",
                 e.what());
        return CE_Failure;
    }

    // destroy our one and replace it
    CSLDestroy(m_papszMetadataList);
    m_papszMetadataList = CSLDuplicate(papszMetadata);
    return CE_None;
}

CPLErr KEADataset::AddBand(GDALDataType eType, char **papszOptions)
{
    // process any creation options in papszOptions
    unsigned int nimageBlockSize = kealib::KEA_IMAGE_CHUNK_SIZE;
    unsigned int nattBlockSize = kealib::KEA_ATT_CHUNK_SIZE;
    unsigned int ndeflate = kealib::KEA_DEFLATE;
    if (papszOptions != nullptr)
    {
        const char *pszValue =
            CSLFetchNameValue(papszOptions, "IMAGEBLOCKSIZE");
        if (pszValue != nullptr)
        {
            nimageBlockSize = atoi(pszValue);
        }

        pszValue = CSLFetchNameValue(papszOptions, "ATTBLOCKSIZE");
        if (pszValue != nullptr)
        {
            nattBlockSize = atoi(pszValue);
        }

        pszValue = CSLFetchNameValue(papszOptions, "DEFLATE");
        if (pszValue != nullptr)
        {
            ndeflate = atoi(pszValue);
        }
    }

    kealib::KEADataType keaDataType = GDAL_to_KEA_Type(eType);
    if (keaDataType == kealib::kea_undefined)
    {
        CPLError(CE_Failure, CPLE_NotSupported,
                 "Data type %s not supported in KEA",
                 GDALGetDataTypeName(eType));
        return CE_Failure;
    }

    try
    {
        m_pImageIO->addImageBand(keaDataType, "", nimageBlockSize,
                                 nattBlockSize, ndeflate);
    }
    catch (const kealib::KEAIOException &e)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "Unable to create band: %s",
                 e.what());
        return CE_Failure;
    }

    // create a new band and add it to the dataset
    // note GDAL uses indices starting at 1 and so does kealib
    KEARasterBand *pBand = new KEARasterBand(
        this, this->nBands + 1, this->eAccess, m_pImageIO, m_pRefcount);
    this->SetBand(this->nBands + 1, pBand);

    return CE_None;
}

int KEADataset::GetGCPCount()
{
    try
    {
        return m_pImageIO->getGCPCount();
    }
    catch (const kealib::KEAIOException &)
    {
        return 0;
    }
}

const OGRSpatialReference *KEADataset::GetGCPSpatialRef() const
{
    CPLMutexHolderD(&m_hMutex);
    if (m_oGCPSRS.IsEmpty())
    {
        try
        {
            std::string sProj = m_pImageIO->getGCPProjection();
            m_oGCPSRS.SetAxisMappingStrategy(OAMS_TRADITIONAL_GIS_ORDER);
            m_oGCPSRS.Clear();
            if (!sProj.empty())
                m_oGCPSRS.importFromWkt(sProj.c_str());
        }
        catch (const kealib::KEAIOException &)
        {
            return nullptr;
        }
    }
    return m_oGCPSRS.IsEmpty() ? nullptr : &m_oGCPSRS;
}

const GDAL_GCP *KEADataset::GetGCPs()
{
    CPLMutexHolderD(&m_hMutex);
    if (m_pGCPs == nullptr)
    {
        // convert to GDAL data structures
        try
        {
            unsigned int nCount = m_pImageIO->getGCPCount();
            std::vector<kealib::KEAImageGCP *> *pKEAGCPs =
                m_pImageIO->getGCPs();

            m_pGCPs = (GDAL_GCP *)CPLCalloc(nCount, sizeof(GDAL_GCP));
            for (unsigned int nIndex = 0; nIndex < nCount; nIndex++)
            {
                GDAL_GCP *pGCP = &m_pGCPs[nIndex];
                kealib::KEAImageGCP *pKEAGCP = pKEAGCPs->at(nIndex);
                pGCP->pszId = CPLStrdup(pKEAGCP->pszId.c_str());
                pGCP->pszInfo = CPLStrdup(pKEAGCP->pszInfo.c_str());
                pGCP->dfGCPPixel = pKEAGCP->dfGCPPixel;
                pGCP->dfGCPLine = pKEAGCP->dfGCPLine;
                pGCP->dfGCPX = pKEAGCP->dfGCPX;
                pGCP->dfGCPY = pKEAGCP->dfGCPY;
                pGCP->dfGCPZ = pKEAGCP->dfGCPZ;

                delete pKEAGCP;
            }

            delete pKEAGCPs;
        }
        catch (const kealib::KEAIOException &)
        {
            return nullptr;
        }
    }
    return m_pGCPs;
}

CPLErr KEADataset::SetGCPs(int nGCPCount, const GDAL_GCP *pasGCPList,
                           const OGRSpatialReference *poSRS)
{
    CPLMutexHolderD(&m_hMutex);
    this->DestroyGCPs();
    m_oGCPSRS.Clear();
    CPLErr result = CE_None;

    std::vector<kealib::KEAImageGCP *> *pKEAGCPs =
        new std::vector<kealib::KEAImageGCP *>(nGCPCount);
    for (int nIndex = 0; nIndex < nGCPCount; nIndex++)
    {
        const GDAL_GCP *pGCP = &pasGCPList[nIndex];
        kealib::KEAImageGCP *pKEA = new kealib::KEAImageGCP;
        pKEA->pszId = pGCP->pszId;
        pKEA->pszInfo = pGCP->pszInfo;
        pKEA->dfGCPPixel = pGCP->dfGCPPixel;
        pKEA->dfGCPLine = pGCP->dfGCPLine;
        pKEA->dfGCPX = pGCP->dfGCPX;
        pKEA->dfGCPY = pGCP->dfGCPY;
        pKEA->dfGCPZ = pGCP->dfGCPZ;
        pKEAGCPs->at(nIndex) = pKEA;
    }
    try
    {
        char *pszGCPProjection = nullptr;
        if (poSRS)
        {
            m_oGCPSRS = *poSRS;
            poSRS->exportToWkt(&pszGCPProjection);
            m_pImageIO->setGCPs(pKEAGCPs,
                                pszGCPProjection ? pszGCPProjection : "");
            CPLFree(pszGCPProjection);
        }
        else
        {
            m_pImageIO->setGCPs(pKEAGCPs, "");
        }
    }
    catch (const kealib::KEAIOException &e)
    {
        CPLError(CE_Warning, CPLE_AppDefined, "Unable to write GCPs: %s",
                 e.what());
        result = CE_Failure;
    }

    for (std::vector<kealib::KEAImageGCP *>::iterator itr = pKEAGCPs->begin();
         itr != pKEAGCPs->end(); ++itr)
    {
        kealib::KEAImageGCP *pKEA = (*itr);
        delete pKEA;
    }
    delete pKEAGCPs;

    return result;
}

void KEADataset::DestroyGCPs()
{
    CPLMutexHolderD(&m_hMutex);
    if (m_pGCPs != nullptr)
    {
        // we assume this is always the same as the internal list...
        int nCount = this->GetGCPCount();
        for (int nIndex = 0; nIndex < nCount; nIndex++)
        {
            GDAL_GCP *pGCP = &m_pGCPs[nIndex];
            CPLFree(pGCP->pszId);
            CPLFree(pGCP->pszInfo);
        }
        CPLFree(m_pGCPs);
        m_pGCPs = nullptr;
    }
}
