/******************************************************************************
 *
 * Project:  GDAL Core
 * Purpose:  Read metadata (mainly the remote sensing imagery) from files of
 *           different providers like DigitalGlobe, GeoEye etc.
 * Author:   Frank Warmerdam, warmerdam@pobox.com
 * Author:   Dmitry Baryshnikov, polimax@mail.ru
 *
 ******************************************************************************
 * Copyright (c) HER MAJESTY THE QUEEN IN RIGHT OF CANADA (2008)
 * as represented by the Canadian Nuclear Safety Commission
 * Copyright (c) 2014-2015, NextGIS info@nextgis.ru
 *
 * 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 "cpl_port.h"
#include "gdal_mdreader.h"

#include <cctype>
#include <cstddef>
#include <cstdio>
#include <cstring>
#include <ctime>
#include <string>

#include "cpl_conv.h"
#include "cpl_error.h"
#include "cpl_minixml.h"
#include "cpl_string.h"
#include "cpl_time.h"
#include "cpl_vsi.h"
#include "cplkeywordparser.h"
#include "gdal_priv.h"

// readers
#include "mdreader/reader_alos.h"
#include "mdreader/reader_digital_globe.h"
#include "mdreader/reader_eros.h"
#include "mdreader/reader_geo_eye.h"
#include "mdreader/reader_kompsat.h"
#include "mdreader/reader_landsat.h"
#include "mdreader/reader_orb_view.h"
#include "mdreader/reader_pleiades.h"
#include "mdreader/reader_rapid_eye.h"
#include "mdreader/reader_rdk1.h"
#include "mdreader/reader_spot.h"

/**
 * The RPC parameters names
 */

static const char *const apszRPCTXTSingleValItems[] = {
    RPC_ERR_BIAS,   RPC_ERR_RAND,  RPC_LINE_OFF,   RPC_SAMP_OFF,
    RPC_LAT_OFF,    RPC_LONG_OFF,  RPC_HEIGHT_OFF, RPC_LINE_SCALE,
    RPC_SAMP_SCALE, RPC_LAT_SCALE, RPC_LONG_SCALE, RPC_HEIGHT_SCALE,
    nullptr};

static const char *const apszRPCTXT20ValItems[] = {
    RPC_LINE_NUM_COEFF, RPC_LINE_DEN_COEFF, RPC_SAMP_NUM_COEFF,
    RPC_SAMP_DEN_COEFF, nullptr};

/**
 * GDALMDReaderManager()
 */
GDALMDReaderManager::GDALMDReaderManager() = default;

/**
 * ~GDALMDReaderManager()
 */
GDALMDReaderManager::~GDALMDReaderManager()
{
    if (nullptr != m_pReader)
    {
        delete m_pReader;
    }
}

/**
 * GetReader()
 */

#define INIT_READER(reader)                                                    \
    GDALMDReaderBase *pReaderBase = new reader(pszPath, papszSiblingFiles);    \
    if (pReaderBase->HasRequiredFiles())                                       \
    {                                                                          \
        m_pReader = pReaderBase;                                               \
        return m_pReader;                                                      \
    }                                                                          \
    delete pReaderBase

GDALMDReaderBase *GDALMDReaderManager::GetReader(const char *pszPath,
                                                 char **papszSiblingFiles,
                                                 GUInt32 nType)
{
    if (!GDALCanFileAcceptSidecarFile(pszPath))
        return nullptr;

    if (nType & MDR_DG)
    {
        INIT_READER(GDALMDReaderDigitalGlobe);
    }

    // required filename.tif filename.pvl filename_rpc.txt
    if (nType & MDR_OV)
    {
        INIT_READER(GDALMDReaderOrbView);
    }

    if (nType & MDR_GE)
    {
        INIT_READER(GDALMDReaderGeoEye);
    }

    if (nType & MDR_LS)
    {
        INIT_READER(GDALMDReaderLandsat);
    }

    if (nType & MDR_PLEIADES)
    {
        INIT_READER(GDALMDReaderPleiades);
    }

    if (nType & MDR_SPOT)
    {
        INIT_READER(GDALMDReaderSpot);
    }

    if (nType & MDR_RDK1)
    {
        INIT_READER(GDALMDReaderResursDK1);
    }

    if (nType & MDR_RE)
    {
        INIT_READER(GDALMDReaderRapidEye);
    }

    // required filename.tif filename.rpc filename.txt
    if (nType & MDR_KOMPSAT)
    {
        INIT_READER(GDALMDReaderKompsat);
    }

    if (nType & MDR_EROS)
    {
        INIT_READER(GDALMDReaderEROS);
    }

    if (nType & MDR_ALOS)
    {
        INIT_READER(GDALMDReaderALOS);
    }

    return nullptr;
}

/**
 * GDALMDReaderBase()
 */
GDALMDReaderBase::GDALMDReaderBase(const char * /* pszPath */,
                                   char ** /* papszSiblingFiles */)
{
}

/**
 * ~GDALMDReaderBase()
 */
GDALMDReaderBase::~GDALMDReaderBase()
{
    CSLDestroy(m_papszIMDMD);
    CSLDestroy(m_papszRPCMD);
    CSLDestroy(m_papszIMAGERYMD);
    CSLDestroy(m_papszDEFAULTMD);
}

/**
 * GetMetadataItem()
 */
char **GDALMDReaderBase::GetMetadataDomain(const char *pszDomain)
{
    LoadMetadata();
    if (EQUAL(pszDomain, MD_DOMAIN_DEFAULT))
        return m_papszDEFAULTMD;
    else if (EQUAL(pszDomain, MD_DOMAIN_IMD))
        return m_papszIMDMD;
    else if (EQUAL(pszDomain, MD_DOMAIN_RPC))
        return m_papszRPCMD;
    else if (EQUAL(pszDomain, MD_DOMAIN_IMAGERY))
        return m_papszIMAGERYMD;
    return nullptr;
}

/**
 * LoadMetadata()
 */
void GDALMDReaderBase::LoadMetadata()
{
    if (m_bIsMetadataLoad)
        return;
    m_bIsMetadataLoad = true;
}

/**
 * GetAcqisitionTimeFromString()
 */
GIntBig GDALMDReaderBase::GetAcquisitionTimeFromString(const char *pszDateTime)
{
    if (nullptr == pszDateTime)
        return 0;

    int iYear = 0;
    int iMonth = 0;
    int iDay = 0;
    int iHours = 0;
    int iMin = 0;
    int iSec = 0;

    const int r = sscanf(pszDateTime, "%d-%d-%dT%d:%d:%d.%*dZ", &iYear, &iMonth,
                         &iDay, &iHours, &iMin, &iSec);

    if (r != 6)
        return 0;

    struct tm tmDateTime;
    tmDateTime.tm_sec = iSec;
    tmDateTime.tm_min = iMin;
    tmDateTime.tm_hour = iHours;
    tmDateTime.tm_mday = iDay;
    tmDateTime.tm_mon = iMonth - 1;
    tmDateTime.tm_year = iYear - 1900;
    tmDateTime.tm_isdst = -1;

    return CPLYMDHMSToUnixTime(&tmDateTime);
}

/**
 * FillMetadata()
 */

#define SETMETADATA(mdmd, md, domain)                                          \
    if (nullptr != md)                                                         \
    {                                                                          \
        char **papszCurrentMd = CSLDuplicate(mdmd->GetMetadata(domain));       \
        papszCurrentMd = CSLMerge(papszCurrentMd, md);                         \
        mdmd->SetMetadata(papszCurrentMd, domain);                             \
        CSLDestroy(papszCurrentMd);                                            \
    }

bool GDALMDReaderBase::FillMetadata(GDALMultiDomainMetadata *poMDMD)
{
    if (nullptr == poMDMD)
        return false;

    LoadMetadata();

    SETMETADATA(poMDMD, m_papszIMDMD, MD_DOMAIN_IMD);
    SETMETADATA(poMDMD, m_papszRPCMD, MD_DOMAIN_RPC);
    SETMETADATA(poMDMD, m_papszIMAGERYMD, MD_DOMAIN_IMAGERY);
    SETMETADATA(poMDMD, m_papszDEFAULTMD, MD_DOMAIN_DEFAULT);

    return true;
}

/**
 * AddXMLNameValueToList()
 */
char **GDALMDReaderBase::AddXMLNameValueToList(char **papszList,
                                               const char *pszName,
                                               const char *pszValue)
{
    return CSLAddNameValue(papszList, pszName, pszValue);
}

/**
 * ReadXMLToListFirstPass()
 */
bool GDALMDReaderBase::ReadXMLToListFirstPass(
    const CPLXMLNode *psNode, std::map<std::string, int> &oMapCountKeysFull,
    const std::string &osPrefixFull, int nDepth)
{
    if (nDepth == 10)
    {
        CPLError(CE_Failure, CPLE_AppDefined, "Too much nested XML");
        return false;
    }
    if (nullptr == psNode)
        return true;
    while (true)
    {
        if (psNode->eType == CXT_Element)
        {
            std::string osNewPrefixFull;
            for (const CPLXMLNode *psChildNode = psNode->psChild;
                 nullptr != psChildNode; psChildNode = psChildNode->psNext)
            {
                if (psChildNode->eType == CXT_Element)
                {
                    osNewPrefixFull = !osPrefixFull.empty()
                                          ? osPrefixFull
                                          : std::string(psNode->pszValue);
                    osNewPrefixFull += '.';
                    osNewPrefixFull += psChildNode->pszValue;
                    osNewPrefixFull +=
                        CPLSPrintf("_%d", ++oMapCountKeysFull[osNewPrefixFull]);

                    if (!ReadXMLToListFirstPass(psChildNode, oMapCountKeysFull,
                                                osNewPrefixFull, nDepth + 1))
                        return false;
                }
            }
        }

        // proceed next only on top level

        if (nullptr != psNode->psNext && osPrefixFull.empty())
        {
            psNode = psNode->psNext;
        }
        else
        {
            break;
        }
    }
    return true;
}

/**
 * ReadXMLToList()
 */
char **GDALMDReaderBase::ReadXMLToList(
    const CPLXMLNode *psNode, char **papszList,
    const std::map<std::string, int> &oMapCountKeysFullRef,
    std::map<std::string, int> &oMapCountKeysFull,
    std::map<std::string, int> &oMapCountKeys, const std::string &osPrefix,
    const std::string &osPrefixFull)
{
    if (nullptr == psNode)
        return papszList;

    while (true)
    {
        if (psNode->eType == CXT_Text)
        {
            papszList = AddXMLNameValueToList(papszList, osPrefix.c_str(),
                                              psNode->pszValue);
        }

        if (psNode->eType == CXT_Element)
        {
            std::string osNewPrefix;
            std::string osNewPrefixFull;
            for (const CPLXMLNode *psChildNode = psNode->psChild;
                 nullptr != psChildNode; psChildNode = psChildNode->psNext)
            {
                if (psChildNode->eType == CXT_Element)
                {
                    osNewPrefixFull = !osPrefixFull.empty()
                                          ? osPrefixFull
                                          : std::string(psNode->pszValue);
                    osNewPrefixFull += '.';
                    osNewPrefixFull += psChildNode->pszValue;

                    const auto oIter =
                        oMapCountKeysFullRef.find(osNewPrefixFull);
                    CPLAssert(oIter != oMapCountKeysFullRef.end());
                    osNewPrefixFull +=
                        CPLSPrintf("_%d", ++oMapCountKeysFull[osNewPrefixFull]);

                    osNewPrefix = !osPrefix.empty()
                                      ? osPrefix
                                      : std::string(psNode->pszValue);
                    osNewPrefix += '.';
                    osNewPrefix += psChildNode->pszValue;
                    const int nIndex = ++oMapCountKeys[osNewPrefix];
                    const bool bMultipleInstances = oIter->second >= 2;
                    if (bMultipleInstances)
                    {
                        osNewPrefix += CPLSPrintf("_%d", nIndex);
                    }
                    papszList = ReadXMLToList(psChildNode, papszList,
                                              oMapCountKeysFullRef,
                                              oMapCountKeysFull, oMapCountKeys,
                                              osNewPrefix, osNewPrefixFull);
                }
                else if (psChildNode->eType == CXT_Attribute)
                {
                    papszList = AddXMLNameValueToList(
                        papszList,
                        CPLSPrintf("%s.%s", osPrefix.c_str(),
                                   psChildNode->pszValue),
                        psChildNode->psChild->pszValue);
                }
                else
                {
                    // Text nodes should always have name
                    if (osPrefix.empty())
                    {
                        papszList = ReadXMLToList(
                            psChildNode, papszList, oMapCountKeysFullRef,
                            oMapCountKeysFull, oMapCountKeys, psNode->pszValue,
                            psNode->pszValue);
                    }
                    else
                    {
                        papszList = ReadXMLToList(
                            psChildNode, papszList, oMapCountKeysFullRef,
                            oMapCountKeysFull, oMapCountKeys, osPrefix.c_str(),
                            osNewPrefixFull.c_str());
                    }
                }
            }
        }

        // proceed next only on top level

        if (nullptr != psNode->psNext && osPrefix.empty())
        {
            psNode = psNode->psNext;
        }
        else
        {
            break;
        }
    }

    return papszList;
}

/**
 * ReadXMLToList()
 */
char **GDALMDReaderBase::ReadXMLToList(CPLXMLNode *psNode, char **papszList,
                                       const char *pszName)
{
    std::map<std::string, int> oMapCountKeysFullRef;
    if (!ReadXMLToListFirstPass(psNode, oMapCountKeysFullRef, pszName, 0))
        return papszList;
    std::map<std::string, int> oMapCountKeysFull;
    std::map<std::string, int> oMapCountKeys;
    return ReadXMLToList(psNode, papszList, oMapCountKeysFullRef,
                         oMapCountKeysFull, oMapCountKeys, pszName, pszName);
}

//------------------------------------------------------------------------------
// Miscellaneous functions
//------------------------------------------------------------------------------

/**
 * GDALCheckFileHeader()
 */
bool GDALCheckFileHeader(const CPLString &soFilePath, const char *pszTestString,
                         int nBufferSize)
{
    VSILFILE *fpL = VSIFOpenL(soFilePath, "r");
    if (fpL == nullptr)
        return false;
    char *pBuffer = new char[nBufferSize + 1];
    const int nReadBytes =
        static_cast<int>(VSIFReadL(pBuffer, 1, nBufferSize, fpL));
    CPL_IGNORE_RET_VAL(VSIFCloseL(fpL));
    if (nReadBytes == 0)
    {
        delete[] pBuffer;
        return false;
    }
    pBuffer[nReadBytes] = '\0';

    const bool bResult = strstr(pBuffer, pszTestString) != nullptr;
    delete[] pBuffer;

    return bResult;
}

/**
 * CPLStrip()
 */
CPLString CPLStrip(const CPLString &sString, const char cChar)
{
    if (sString.empty())
        return sString;

    size_t dCopyFrom = 0;
    size_t dCopyCount = sString.size();

    if (sString[0] == cChar)
    {
        dCopyFrom++;
        dCopyCount--;
    }

    if (sString.back() == cChar)
        dCopyCount--;

    if (dCopyCount == 0)
        return CPLString();

    return sString.substr(dCopyFrom, dCopyCount);
}

/**
 * CPLStripQuotes()
 */
CPLString CPLStripQuotes(const CPLString &sString)
{
    return CPLStrip(CPLStrip(sString, '"'), '\'');
}

/************************************************************************/
/*                          GDALLoadRPBFile()                           */
/************************************************************************/

static const char *const apszRPBMap[] = {apszRPCTXTSingleValItems[0],
                                         "IMAGE.errBias",
                                         apszRPCTXTSingleValItems[1],
                                         "IMAGE.errRand",
                                         apszRPCTXTSingleValItems[2],
                                         "IMAGE.lineOffset",
                                         apszRPCTXTSingleValItems[3],
                                         "IMAGE.sampOffset",
                                         apszRPCTXTSingleValItems[4],
                                         "IMAGE.latOffset",
                                         apszRPCTXTSingleValItems[5],
                                         "IMAGE.longOffset",
                                         apszRPCTXTSingleValItems[6],
                                         "IMAGE.heightOffset",
                                         apszRPCTXTSingleValItems[7],
                                         "IMAGE.lineScale",
                                         apszRPCTXTSingleValItems[8],
                                         "IMAGE.sampScale",
                                         apszRPCTXTSingleValItems[9],
                                         "IMAGE.latScale",
                                         apszRPCTXTSingleValItems[10],
                                         "IMAGE.longScale",
                                         apszRPCTXTSingleValItems[11],
                                         "IMAGE.heightScale",
                                         apszRPCTXT20ValItems[0],
                                         "IMAGE.lineNumCoef",
                                         apszRPCTXT20ValItems[1],
                                         "IMAGE.lineDenCoef",
                                         apszRPCTXT20ValItems[2],
                                         "IMAGE.sampNumCoef",
                                         apszRPCTXT20ValItems[3],
                                         "IMAGE.sampDenCoef",
                                         nullptr,
                                         nullptr};

char **GDALLoadRPBFile(const CPLString &soFilePath)
{
    if (soFilePath.empty())
        return nullptr;

    /* -------------------------------------------------------------------- */
    /*      Read file and parse.                                            */
    /* -------------------------------------------------------------------- */
    VSILFILE *fp = VSIFOpenL(soFilePath, "r");

    if (fp == nullptr)
        return nullptr;

    CPLKeywordParser oParser;
    if (!oParser.Ingest(fp))
    {
        CPL_IGNORE_RET_VAL(VSIFCloseL(fp));
        return nullptr;
    }

    CPL_IGNORE_RET_VAL(VSIFCloseL(fp));

    /* -------------------------------------------------------------------- */
    /*      Extract RPC information, in a GDAL "standard" metadata format.  */
    /* -------------------------------------------------------------------- */
    char **papszMD = nullptr;
    for (int i = 0; apszRPBMap[i] != nullptr; i += 2)
    {
        const char *pszRPBVal = oParser.GetKeyword(apszRPBMap[i + 1]);
        CPLString osAdjVal;

        if (pszRPBVal == nullptr)
        {
            if (strcmp(apszRPBMap[i], RPC_ERR_RAND) == 0 ||
                strcmp(apszRPBMap[i], RPC_ERR_BIAS) == 0)
            {
                continue;
            }
            CPLError(
                CE_Failure, CPLE_AppDefined,
                "%s file found, but missing %s field (and possibly others).",
                soFilePath.c_str(), apszRPBMap[i + 1]);
            CSLDestroy(papszMD);
            return nullptr;
        }

        if (strchr(pszRPBVal, ',') == nullptr)
            osAdjVal = pszRPBVal;
        else
        {
            // strip out commas and turn newlines into spaces.
            for (int j = 0; pszRPBVal[j] != '\0'; j++)
            {
                switch (pszRPBVal[j])
                {
                    case ',':
                    case '\n':
                    case '\r':
                        osAdjVal += ' ';
                        break;

                    case '(':
                    case ')':
                        break;

                    default:
                        osAdjVal += pszRPBVal[j];
                }
            }
        }

        papszMD = CSLSetNameValue(papszMD, apszRPBMap[i], osAdjVal);
    }

    return papszMD;
}

/************************************************************************/
/*                          GDALLoadRPCFile()                           */
/************************************************************************/

/* Load a GeoEye _rpc.txt file. See ticket
 * http://trac.osgeo.org/gdal/ticket/3639 */

char **GDALLoadRPCFile(const CPLString &soFilePath)
{
    if (soFilePath.empty())
        return nullptr;

    /* -------------------------------------------------------------------- */
    /*      Read file and parse.                                            */
    /* -------------------------------------------------------------------- */
    // 100 lines would be enough, but some .rpc files have CR CR LF end of
    // lines, which result in a blank line to be recognized, so accept up
    // to 200 lines (#6341)
    char **papszLines = CSLLoad2(soFilePath, 200, 100, nullptr);
    if (!papszLines)
        return nullptr;

    char **papszMD = nullptr;

    /* From LINE_OFF to HEIGHT_SCALE */
    for (size_t i = 0; i < 23; i += 2)
    {
        const char *pszRPBVal = CSLFetchNameValue(papszLines, apszRPBMap[i]);

        if (pszRPBVal == nullptr)
        {
            if (strcmp(apszRPBMap[i], RPC_ERR_RAND) == 0 ||
                strcmp(apszRPBMap[i], RPC_ERR_BIAS) == 0)
            {
                continue;
            }
            CPLError(
                CE_Failure, CPLE_AppDefined,
                "%s file found, but missing %s field (and possibly others).",
                soFilePath.c_str(), apszRPBMap[i]);
            CSLDestroy(papszMD);
            CSLDestroy(papszLines);
            return nullptr;
        }
        else
        {
            while (*pszRPBVal == ' ' || *pszRPBVal == '\t')
                pszRPBVal++;
            papszMD = CSLSetNameValue(papszMD, apszRPBMap[i], pszRPBVal);
        }
    }

    /* For LINE_NUM_COEFF, LINE_DEN_COEFF, SAMP_NUM_COEFF, SAMP_DEN_COEFF */
    /* parameters that have 20 values each */
    for (size_t i = 24; apszRPBMap[i] != nullptr; i += 2)
    {
        CPLString soVal;
        for (int j = 1; j <= 20; j++)
        {
            CPLString soRPBMapItem;
            soRPBMapItem.Printf("%s_%d", apszRPBMap[i], j);
            const char *pszRPBVal =
                CSLFetchNameValue(papszLines, soRPBMapItem.c_str());
            if (pszRPBVal == nullptr)
            {
                CPLError(CE_Failure, CPLE_AppDefined,
                         "%s file found, but missing %s field (and possibly "
                         "others).",
                         soFilePath.c_str(), soRPBMapItem.c_str());
                CSLDestroy(papszMD);
                CSLDestroy(papszLines);
                return nullptr;
            }
            else
            {
                while (*pszRPBVal == ' ' || *pszRPBVal == '\t')
                    pszRPBVal++;
                soVal += pszRPBVal;
                soVal += " ";
            }
        }
        papszMD = CSLSetNameValue(papszMD, apszRPBMap[i], soVal.c_str());
    }

    CSLDestroy(papszLines);
    return papszMD;
}

/************************************************************************/
/*                         GDALWriteRPCTXTFile()                        */
/************************************************************************/

CPLErr GDALWriteRPCTXTFile(const char *pszFilename, char **papszMD)

{
    CPLString osRPCFilename = pszFilename;
    CPLString soPt(".");
    size_t found = osRPCFilename.rfind(soPt);
    if (found == CPLString::npos)
        return CE_Failure;
    osRPCFilename.replace(found, osRPCFilename.size() - found, "_RPC.TXT");
    if (papszMD == nullptr)
    {
        VSIUnlink(osRPCFilename);
        return CE_None;
    }

    /* -------------------------------------------------------------------- */
    /*      Read file and parse.                                            */
    /* -------------------------------------------------------------------- */
    VSILFILE *fp = VSIFOpenL(osRPCFilename, "w");

    if (fp == nullptr)
    {
        CPLError(CE_Failure, CPLE_OpenFailed,
                 "Unable to create %s for writing.\n%s", osRPCFilename.c_str(),
                 CPLGetLastErrorMsg());
        return CE_Failure;
    }

    /* -------------------------------------------------------------------- */
    /*      Write RPC values from our RPC metadata.                         */
    /* -------------------------------------------------------------------- */
    bool bOK = true;
    for (int i = 0; apszRPCTXTSingleValItems[i] != nullptr; i++)
    {
        const char *pszRPCVal =
            CSLFetchNameValue(papszMD, apszRPCTXTSingleValItems[i]);
        if (pszRPCVal == nullptr)
        {
            if (strcmp(apszRPCTXTSingleValItems[i], RPC_ERR_BIAS) == 0 ||
                strcmp(apszRPCTXTSingleValItems[i], RPC_ERR_RAND) == 0)
            {
                continue;
            }
            CPLError(CE_Failure, CPLE_AppDefined,
                     "%s field missing in metadata, %s file not written.",
                     apszRPCTXTSingleValItems[i], osRPCFilename.c_str());
            CPL_IGNORE_RET_VAL(VSIFCloseL(fp));
            VSIUnlink(osRPCFilename);
            return CE_Failure;
        }

        bOK &= VSIFPrintfL(fp, "%s: %s\n", apszRPCTXTSingleValItems[i],
                           pszRPCVal) > 0;
    }

    for (int i = 0; apszRPCTXT20ValItems[i] != nullptr; i++)
    {
        const char *pszRPCVal =
            CSLFetchNameValue(papszMD, apszRPCTXT20ValItems[i]);
        if (pszRPCVal == nullptr)
        {
            CPLError(CE_Failure, CPLE_AppDefined,
                     "%s field missing in metadata, %s file not written.",
                     apszRPCTXTSingleValItems[i], osRPCFilename.c_str());
            CPL_IGNORE_RET_VAL(VSIFCloseL(fp));
            VSIUnlink(osRPCFilename);
            return CE_Failure;
        }

        char **papszItems =
            CSLTokenizeStringComplex(pszRPCVal, " ,", FALSE, FALSE);

        if (CSLCount(papszItems) != 20)
        {
            CPLError(CE_Failure, CPLE_AppDefined,
                     "%s field is corrupt (not 20 values), %s file not "
                     "written.\n%s = %s",
                     apszRPCTXT20ValItems[i], osRPCFilename.c_str(),
                     apszRPCTXT20ValItems[i], pszRPCVal);
            CPL_IGNORE_RET_VAL(VSIFCloseL(fp));
            VSIUnlink(osRPCFilename);
            CSLDestroy(papszItems);
            return CE_Failure;
        }

        for (int j = 0; j < 20; j++)
        {
            bOK &= VSIFPrintfL(fp, "%s_%d: %s\n", apszRPCTXT20ValItems[i],
                               j + 1, papszItems[j]) > 0;
        }
        CSLDestroy(papszItems);
    }

    if (VSIFCloseL(fp) != 0)
        bOK = false;

    return bOK ? CE_None : CE_Failure;
}

/************************************************************************/
/*                          GDALWriteRPBFile()                          */
/************************************************************************/

CPLErr GDALWriteRPBFile(const char *pszFilename, char **papszMD)

{
    CPLString osRPBFilename = CPLResetExtension(pszFilename, "RPB");
    if (papszMD == nullptr)
    {
        VSIUnlink(osRPBFilename);
        return CE_None;
    }

    /* -------------------------------------------------------------------- */
    /*      Read file and parse.                                            */
    /* -------------------------------------------------------------------- */
    VSILFILE *fp = VSIFOpenL(osRPBFilename, "w");

    if (fp == nullptr)
    {
        CPLError(CE_Failure, CPLE_OpenFailed,
                 "Unable to create %s for writing.\n%s", osRPBFilename.c_str(),
                 CPLGetLastErrorMsg());
        return CE_Failure;
    }

    /* -------------------------------------------------------------------- */
    /*      Write the prefix information.                                   */
    /* -------------------------------------------------------------------- */
    bool bOK = VSIFPrintfL(fp, "%s", "satId = \"QB02\";\n") > 0;
    bOK &= VSIFPrintfL(fp, "%s", "bandId = \"P\";\n") > 0;
    bOK &= VSIFPrintfL(fp, "%s", "SpecId = \"RPC00B\";\n") > 0;
    bOK &= VSIFPrintfL(fp, "%s", "BEGIN_GROUP = IMAGE\n") > 0;

    /* -------------------------------------------------------------------- */
    /*      Write RPC values from our RPC metadata.                         */
    /* -------------------------------------------------------------------- */
    for (int i = 0; apszRPBMap[i] != nullptr; i += 2)
    {
        const char *pszRPBVal = CSLFetchNameValue(papszMD, apszRPBMap[i]);
        const char *pszRPBTag;

        if (pszRPBVal == nullptr)
        {
            if (strcmp(apszRPBMap[i], RPC_ERR_BIAS) == 0)
            {
                bOK &= VSIFPrintfL(fp, "%s", "\terrBias = 0.0;\n") > 0;
                continue;
            }
            else if (strcmp(apszRPBMap[i], RPC_ERR_RAND) == 0)
            {
                bOK &= VSIFPrintfL(fp, "%s", "\terrRand = 0.0;\n") > 0;
                continue;
            }
            CPLError(CE_Failure, CPLE_AppDefined,
                     "%s field missing in metadata, %s file not written.",
                     apszRPBMap[i], osRPBFilename.c_str());
            CPL_IGNORE_RET_VAL(VSIFCloseL(fp));
            VSIUnlink(osRPBFilename);
            return CE_Failure;
        }

        pszRPBTag = apszRPBMap[i + 1];
        if (STARTS_WITH_CI(pszRPBTag, "IMAGE."))
            pszRPBTag += 6;

        if (strstr(apszRPBMap[i], "COEF") == nullptr)
        {
            bOK &= VSIFPrintfL(fp, "\t%s = %s;\n", pszRPBTag, pszRPBVal) > 0;
        }
        else
        {
            // Reformat in brackets with commas over multiple lines.

            bOK &= VSIFPrintfL(fp, "\t%s = (\n", pszRPBTag) > 0;

            char **papszItems =
                CSLTokenizeStringComplex(pszRPBVal, " ,", FALSE, FALSE);

            if (CSLCount(papszItems) != 20)
            {
                CPLError(CE_Failure, CPLE_AppDefined,
                         "%s field is corrupt (not 20 values), %s file not "
                         "written.\n%s = %s",
                         apszRPBMap[i], osRPBFilename.c_str(), apszRPBMap[i],
                         pszRPBVal);
                CPL_IGNORE_RET_VAL(VSIFCloseL(fp));
                VSIUnlink(osRPBFilename);
                CSLDestroy(papszItems);
                return CE_Failure;
            }

            for (int j = 0; j < 20; j++)
            {
                if (j < 19)
                    bOK &= VSIFPrintfL(fp, "\t\t\t%s,\n", papszItems[j]) > 0;
                else
                    bOK &= VSIFPrintfL(fp, "\t\t\t%s);\n", papszItems[j]) > 0;
            }
            CSLDestroy(papszItems);
        }
    }

    /* -------------------------------------------------------------------- */
    /*      Write end part                                                  */
    /* -------------------------------------------------------------------- */
    bOK &= VSIFPrintfL(fp, "%s", "END_GROUP = IMAGE\n") > 0;
    bOK &= VSIFPrintfL(fp, "END;\n") > 0;
    if (VSIFCloseL(fp) != 0)
        bOK = false;

    return bOK ? CE_None : CE_Failure;
}

/************************************************************************/
/*                           GDAL_IMD_AA2R()                            */
/*                                                                      */
/*      Translate AA version IMD file to R version.                     */
/************************************************************************/

static bool GDAL_IMD_AA2R(char ***ppapszIMD)

{
    char **papszIMD = *ppapszIMD;

    /* -------------------------------------------------------------------- */
    /*      Verify that we have a new format file.                          */
    /* -------------------------------------------------------------------- */
    const char *pszValue = CSLFetchNameValue(papszIMD, "version");

    if (pszValue == nullptr)
        return false;

    if (EQUAL(pszValue, "\"R\""))
        return true;

    if (!EQUAL(pszValue, "\"AA\""))
    {
        CPLDebug("IMD",
                 "The file is not the expected 'version = \"AA\"' format.\n"
                 "Proceeding, but file may be corrupted.");
    }

    /* -------------------------------------------------------------------- */
    /*      Fix the version line.                                           */
    /* -------------------------------------------------------------------- */
    papszIMD = CSLSetNameValue(papszIMD, "version", "\"R\"");

    /* -------------------------------------------------------------------- */
    /*      remove a bunch of fields.                                       */
    /* -------------------------------------------------------------------- */
    static const char *const apszToRemove[] = {
        "productCatalogId",   "childCatalogId",
        "productType",        "numberOfLooks",
        "effectiveBandwidth", "mode",
        "scanDirection",      "cloudCover",
        "productGSD",         nullptr};

    for (int iKey = 0; apszToRemove[iKey] != nullptr; iKey++)
    {
        int iTarget = CSLFindName(papszIMD, apszToRemove[iKey]);
        if (iTarget != -1)
            papszIMD = CSLRemoveStrings(papszIMD, iTarget, 1, nullptr);
    }

    /* -------------------------------------------------------------------- */
    /*      Replace various min/mean/max with just the mean.                */
    /* -------------------------------------------------------------------- */
    static const char *const keylist[] = {"CollectedRowGSD",
                                          "CollectedColGSD",
                                          "SunAz",
                                          "SunEl",
                                          "SatAz",
                                          "SatEl",
                                          "InTrackViewAngle",
                                          "CrossTrackViewAngle",
                                          "OffNadirViewAngle",
                                          nullptr};

    for (int iKey = 0; keylist[iKey] != nullptr; iKey++)
    {
        CPLString osTarget;
        osTarget.Printf("IMAGE_1.min%s", keylist[iKey]);
        int iTarget = CSLFindName(papszIMD, osTarget);
        if (iTarget != -1)
            papszIMD = CSLRemoveStrings(papszIMD, iTarget, 1, nullptr);

        osTarget.Printf("IMAGE_1.max%s", keylist[iKey]);
        iTarget = CSLFindName(papszIMD, osTarget);
        if (iTarget != -1)
            papszIMD = CSLRemoveStrings(papszIMD, iTarget, 1, nullptr);

        osTarget.Printf("IMAGE_1.mean%s", keylist[iKey]);
        iTarget = CSLFindName(papszIMD, osTarget);
        if (iTarget != -1)
        {
            CPLString osValue = CSLFetchNameValue(papszIMD, osTarget);
            CPLString osLine;
            osTarget.Printf("IMAGE_1.%c%s", tolower(keylist[iKey][0]),
                            keylist[iKey] + 1);

            osLine = osTarget + "=" + osValue;

            CPLFree(papszIMD[iTarget]);
            papszIMD[iTarget] = CPLStrdup(osLine);
        }
    }

    *ppapszIMD = papszIMD;
    return true;
}

/************************************************************************/
/*                          GDALLoadIMDFile()                           */
/************************************************************************/

char **GDALLoadIMDFile(const CPLString &osFilePath)
{
    if (osFilePath.empty())
        return nullptr;

    /* -------------------------------------------------------------------- */
    /*      Read file and parse.                                            */
    /* -------------------------------------------------------------------- */
    CPLKeywordParser oParser;

    VSILFILE *fp = VSIFOpenL(osFilePath, "r");

    if (fp == nullptr)
        return nullptr;

    if (!oParser.Ingest(fp))
    {
        CPL_IGNORE_RET_VAL(VSIFCloseL(fp));
        return nullptr;
    }

    CPL_IGNORE_RET_VAL(VSIFCloseL(fp));

    /* -------------------------------------------------------------------- */
    /*      Consider version changing.                                      */
    /* -------------------------------------------------------------------- */
    char **papszIMD = CSLDuplicate(oParser.GetAllKeywords());
    const char *pszVersion = CSLFetchNameValue(papszIMD, "version");

    if (pszVersion == nullptr)
    {
        /* ? */;
    }
    else if (EQUAL(pszVersion, "\"AA\""))
    {
        GDAL_IMD_AA2R(&papszIMD);
    }

    return papszIMD;
}

/************************************************************************/
/*                       GDALWriteIMDMultiLine()                        */
/*                                                                      */
/*      Write a value that is split over multiple lines.                */
/************************************************************************/

static void GDALWriteIMDMultiLine(VSILFILE *fp, const char *pszValue)

{
    char **papszItems =
        CSLTokenizeStringComplex(pszValue, "(,) ", FALSE, FALSE);
    const int nItemCount = CSLCount(papszItems);

    CPL_IGNORE_RET_VAL(VSIFPrintfL(fp, "(\n"));

    for (int i = 0; i < nItemCount; i++)
    {
        if (i == nItemCount - 1)
            CPL_IGNORE_RET_VAL(VSIFPrintfL(fp, "\t%s );\n", papszItems[i]));
        else
            CPL_IGNORE_RET_VAL(VSIFPrintfL(fp, "\t%s,\n", papszItems[i]));
    }
    CSLDestroy(papszItems);
}

/************************************************************************/
/*                          GDALWriteIMDFile()                          */
/************************************************************************/

CPLErr GDALWriteIMDFile(const char *pszFilename, char **papszMD)

{
    CPLString osRPBFilename = CPLResetExtension(pszFilename, "IMD");

    /* -------------------------------------------------------------------- */
    /*      Read file and parse.                                            */
    /* -------------------------------------------------------------------- */
    VSILFILE *fp = VSIFOpenL(osRPBFilename, "w");

    if (fp == nullptr)
    {
        CPLError(CE_Failure, CPLE_OpenFailed,
                 "Unable to create %s for writing.\n%s", osRPBFilename.c_str(),
                 CPLGetLastErrorMsg());
        return CE_Failure;
    }

    /* ==================================================================== */
    /* -------------------------------------------------------------------- */
    /*      Loop through all values writing.                                */
    /* -------------------------------------------------------------------- */
    /* ==================================================================== */
    CPLString osCurSection;
    bool bOK = true;

    for (int iKey = 0; papszMD[iKey] != nullptr; iKey++)
    {
        char *pszRawKey = nullptr;
        const char *pszValue = CPLParseNameValue(papszMD[iKey], &pszRawKey);
        if (pszRawKey == nullptr)
            continue;
        CPLString osKeySection;
        CPLString osKeyItem;
        char *pszDot = strchr(pszRawKey, '.');

        /* --------------------------------------------------------------------
         */
        /*      Split stuff like BAND_P.ULLon into section and item. */
        /* --------------------------------------------------------------------
         */
        if (pszDot == nullptr)
        {
            osKeyItem = pszRawKey;
        }
        else
        {
            osKeyItem = pszDot + 1;
            *pszDot = '\0';
            osKeySection = pszRawKey;
        }
        CPLFree(pszRawKey);

        /* --------------------------------------------------------------------
         */
        /*      Close and/or start sections as needed. */
        /* --------------------------------------------------------------------
         */
        if (!osCurSection.empty() && !EQUAL(osCurSection, osKeySection))
            bOK &=
                VSIFPrintfL(fp, "END_GROUP = %s\n", osCurSection.c_str()) > 0;

        if (!osKeySection.empty() && !EQUAL(osCurSection, osKeySection))
            bOK &=
                VSIFPrintfL(fp, "BEGIN_GROUP = %s\n", osKeySection.c_str()) > 0;

        osCurSection = osKeySection;

        /* --------------------------------------------------------------------
         */
        /*      Print out simple item. */
        /* --------------------------------------------------------------------
         */
        if (!osCurSection.empty())
            bOK &= VSIFPrintfL(fp, "\t%s = ", osKeyItem.c_str()) > 0;
        else
            bOK &= VSIFPrintfL(fp, "%s = ", osKeyItem.c_str()) > 0;

        if (pszValue[0] != '(')
        {
            const bool bHasSingleQuote = strchr(pszValue, '\'') != nullptr;
            const bool bHasDoubleQuote = strchr(pszValue, '"') != nullptr;
            if (strchr(pszValue, ' ') != nullptr ||
                strchr(pszValue, ';') != nullptr ||
                strchr(pszValue, '\t') != nullptr || bHasSingleQuote ||
                (bHasDoubleQuote && !(pszValue[0] == '"' &&
                                      pszValue[strlen(pszValue) - 1] == '"')))
            {
                if (!bHasDoubleQuote)
                    bOK &= VSIFPrintfL(fp, "\"%s\";\n", pszValue) > 0;
                else if (!bHasSingleQuote)
                    bOK &= VSIFPrintfL(fp, "'%s';\n", pszValue) > 0;
                else
                {
                    // There does not seem to have a way to escape double-quotes
                    // in a double-quoted string (or single-quote in a
                    // single-quoted string), so we are going to convert
                    // double-quotes as two single-quotes...
                    bOK &=
                        VSIFPrintfL(
                            fp, "\"%s\";\n",
                            CPLString(pszValue).replaceAll('"', "''").c_str()) >
                        0;
                }
            }
            else
            {
                bOK &= VSIFPrintfL(fp, "%s;\n", pszValue) > 0;
            }
        }
        else
            GDALWriteIMDMultiLine(fp, pszValue);
    }

    /* -------------------------------------------------------------------- */
    /*      Close off.                                                      */
    /* -------------------------------------------------------------------- */
    if (!osCurSection.empty())
        bOK &= VSIFPrintfL(fp, "END_GROUP = %s\n", osCurSection.c_str()) > 0;

    bOK &= VSIFPrintfL(fp, "END;\n") > 0;

    if (VSIFCloseL(fp) != 0)
        bOK = false;

    return bOK ? CE_None : CE_Failure;
}
