/******************************************************************************
 *
 * Project:  OpenGIS Simple Features Reference Implementation
 * Purpose:  Implements OGRGPSBabelWriteDataSource class.
 * Author:   Even Rouault, <even dot rouault at spatialys.com>
 *
 ******************************************************************************
 * Copyright (c) 2010-2013, Even Rouault <even dot rouault at spatialys.com>
 *
 * SPDX-License-Identifier: MIT
 ****************************************************************************/

#include <cstring>
#include "cpl_conv.h"
#include "cpl_string.h"
#include "cpl_error.h"
#include "cpl_spawn.h"

#include "ogr_gpsbabel.h"

/************************************************************************/
/*                    OGRGPSBabelWriteDataSource()                      */
/************************************************************************/

OGRGPSBabelWriteDataSource::OGRGPSBabelWriteDataSource()
    : pszGPSBabelDriverName(nullptr), pszFilename(nullptr), poGPXDS(nullptr)
{
}

/************************************************************************/
/*                  ~OGRGPSBabelWriteDataSource()                       */
/************************************************************************/

OGRGPSBabelWriteDataSource::~OGRGPSBabelWriteDataSource()

{
    if (poGPXDS)
        GDALClose(poGPXDS);

    Convert();

    CPLFree(pszGPSBabelDriverName);
    CPLFree(pszFilename);
}

/************************************************************************/
/*                                Convert()                             */
/************************************************************************/

bool OGRGPSBabelWriteDataSource::Convert()
{
    int nRet = -1;
    if (!osTmpFileName.empty() && pszFilename != nullptr &&
        pszGPSBabelDriverName != nullptr)
    {
        if (OGRGPSBabelDataSource::IsSpecialFile(pszFilename))
        {
            /* Special file : don't try to open it */
            VSILFILE *tmpfp = VSIFOpenL(osTmpFileName.c_str(), "rb");
            if (tmpfp)
            {
                const char *const argv[] = {"gpsbabel",
                                            "-i",
                                            "gpx",
                                            "-f",
                                            "-",
                                            "-o",
                                            pszGPSBabelDriverName,
                                            "-F",
                                            pszFilename,
                                            nullptr};
                nRet = CPLSpawn(argv, tmpfp, nullptr, TRUE);

                VSIFCloseL(tmpfp);
                tmpfp = nullptr;
            }
        }
        else
        {
            VSILFILE *fp = VSIFOpenL(pszFilename, "wb");
            if (fp == nullptr)
            {
                CPLError(CE_Failure, CPLE_AppDefined, "Cannot open file %s",
                         pszFilename);
            }
            else
            {
                VSILFILE *tmpfp = VSIFOpenL(osTmpFileName.c_str(), "rb");
                if (tmpfp)
                {
                    const char *const argv[] = {"gpsbabel",
                                                "-i",
                                                "gpx",
                                                "-f",
                                                "-",
                                                "-o",
                                                pszGPSBabelDriverName,
                                                "-F",
                                                "-",
                                                nullptr};
                    nRet = CPLSpawn(argv, tmpfp, fp, TRUE);

                    VSIFCloseL(tmpfp);
                    tmpfp = nullptr;
                }

                VSIFCloseL(fp);
                fp = nullptr;
            }
        }

        VSIUnlink(osTmpFileName.c_str());
        osTmpFileName = "";
    }

    return nRet == 0;
}

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

int OGRGPSBabelWriteDataSource::Create(const char *pszNameIn,
                                       char **papszOptions)
{
    GDALDriver *poGPXDriver =
        OGRSFDriverRegistrar::GetRegistrar()->GetDriverByName("GPX");
    if (poGPXDriver == nullptr)
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "GPX driver is necessary for GPSBabel write support");
        return FALSE;
    }

    if (!STARTS_WITH_CI(pszNameIn, "GPSBABEL:"))
    {
        const char *pszOptionGPSBabelDriverName =
            CSLFetchNameValue(papszOptions, "GPSBABEL_DRIVER");
        if (pszOptionGPSBabelDriverName != nullptr)
            pszGPSBabelDriverName = CPLStrdup(pszOptionGPSBabelDriverName);
        else
        {
            CPLError(CE_Failure, CPLE_AppDefined,
                     "GPSBABEL_DRIVER dataset creation option expected");
            return FALSE;
        }

        pszFilename = CPLStrdup(pszNameIn);
    }
    else
    {
        const char *pszSep = strchr(pszNameIn + 9, ':');
        if (pszSep == nullptr)
        {
            CPLError(CE_Failure, CPLE_AppDefined,
                     "Wrong syntax. Expected GPSBabel:driver_name[,options]*:"
                     "file_name");
            return FALSE;
        }

        pszGPSBabelDriverName = CPLStrdup(pszNameIn + 9);
        *(strchr(pszGPSBabelDriverName, ':')) = '\0';

        pszFilename = CPLStrdup(pszSep + 1);
    }

    /* A bit of validation to avoid command line injection */
    if (!OGRGPSBabelDataSource::IsValidDriverName(pszGPSBabelDriverName))
        return FALSE;

    const char *pszOptionUseTempFile =
        CSLFetchNameValue(papszOptions, "USE_TEMPFILE");
    if (pszOptionUseTempFile == nullptr)
        pszOptionUseTempFile = CPLGetConfigOption("USE_TEMPFILE", nullptr);
    if (pszOptionUseTempFile && CPLTestBool(pszOptionUseTempFile))
        osTmpFileName = CPLGenerateTempFilename(nullptr);
    else
        osTmpFileName = VSIMemGenerateHiddenFilename("gpsbabel");

    poGPXDS = poGPXDriver->Create(osTmpFileName.c_str(), 0, 0, 0, GDT_Unknown,
                                  papszOptions);
    if (poGPXDS == nullptr)
        return FALSE;

    return TRUE;
}

/************************************************************************/
/*                           ICreateLayer()                             */
/************************************************************************/

OGRLayer *OGRGPSBabelWriteDataSource::ICreateLayer(
    const char *pszLayerName, const OGRGeomFieldDefn *poGeomFieldDefn,
    CSLConstList papszOptions)
{
    if (poGPXDS)
        return poGPXDS->CreateLayer(pszLayerName, poGeomFieldDefn,
                                    papszOptions);
    return nullptr;
}

/************************************************************************/
/*                           TestCapability()                           */
/************************************************************************/

int OGRGPSBabelWriteDataSource::TestCapability(const char *pszCap)

{
    if (EQUAL(pszCap, ODsCCreateLayer))
        return TRUE;

    return FALSE;
}

/************************************************************************/
/*                              GetLayer()                              */
/************************************************************************/

OGRLayer *OGRGPSBabelWriteDataSource::GetLayer(int iLayer)

{
    if (poGPXDS)
        return poGPXDS->GetLayer(iLayer);

    return nullptr;
}

/************************************************************************/
/*                         GetLayerCount()                              */
/************************************************************************/

int OGRGPSBabelWriteDataSource::GetLayerCount()

{
    if (poGPXDS)
        return poGPXDS->GetLayerCount();

    return 0;
}