/******************************************************************************
 *
 * Project:  OGR
 * Purpose:  OGRNASDriver implementation
 * Author:   Frank Warmerdam, warmerdam@pobox.com
 *
 ******************************************************************************
 * Copyright (c) 2002, Frank Warmerdam <warmerdam@pobox.com>
 *
 * 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_conv.h"
#include "cpl_multiproc.h"
#include "nasreaderp.h"
#include "ogr_nas.h"

CPL_CVSID("$Id: ogrnasdriver.cpp 7c7e86d4dde07b3041902d7e8e3c65d433c03146 2018-07-27 17:17:52 +0200 Juergen E. Fischer $")

/************************************************************************/
/*                     OGRNASDriverIdentify()                           */
/************************************************************************/

static int OGRNASDriverIdentify( GDALOpenInfo* poOpenInfo )

{
    if( poOpenInfo->fpL == nullptr )
        return FALSE;

/* -------------------------------------------------------------------- */
/*      Check for a UTF-8 BOM and skip if found                         */
/*                                                                      */
/*      TODO: BOM is variable-length parameter and depends on encoding. */
/*            Add BOM detection for other encodings.                    */
/* -------------------------------------------------------------------- */

    // Used to skip to actual beginning of XML data
    // const char* szPtr = (const char*)poOpenInfo->pabyHeader;
    const char* szPtr = reinterpret_cast<char *>(poOpenInfo->pabyHeader);

    if( ( (unsigned char)szPtr[0] == 0xEF )
        && ( (unsigned char)szPtr[1] == 0xBB )
        && ( (unsigned char)szPtr[2] == 0xBF) )
    {
        szPtr += 3;
    }

/* -------------------------------------------------------------------- */
/*      Here, we expect the opening chevrons of NAS tree root element   */
/* -------------------------------------------------------------------- */
    if( szPtr[0] != '<' )
        return FALSE;

    if( !poOpenInfo->TryToIngest(8192) )
        return FALSE;
    szPtr = (const char*)poOpenInfo->pabyHeader;

    if( strstr(szPtr,"opengis.net/gml") == nullptr )
        return FALSE;

    char **papszIndicators = CSLTokenizeStringComplex(
        CPLGetConfigOption(
            "NAS_INDICATOR",
            "NAS-Operationen;AAA-Fachschema;aaa.xsd;aaa-suite" ),
        ";", 0, 0 );

    bool bFound = false;
    for( int i = 0; papszIndicators[i] && !bFound; i++ )
    {
        bFound = strstr( szPtr, papszIndicators[i] ) != nullptr;
    }

    CSLDestroy( papszIndicators );

    return bFound;
}

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

static GDALDataset *OGRNASDriverOpen( GDALOpenInfo* poOpenInfo )

{
    if( poOpenInfo->eAccess == GA_Update ||
        !OGRNASDriverIdentify(poOpenInfo) )
        return nullptr;

    VSIFCloseL(poOpenInfo->fpL);
    poOpenInfo->fpL = nullptr;

    OGRNASDataSource *poDS = new OGRNASDataSource();

    if( !poDS->Open( poOpenInfo->pszFilename )
        || poDS->GetLayerCount() == 0 )
    {
        delete poDS;
        return nullptr;
    }

    return poDS;
}

/************************************************************************/
/*                           RegisterOGRNAS()                           */
/************************************************************************/

void RegisterOGRNAS()

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

    GDALDriver *poDriver = new GDALDriver();

    poDriver->SetDescription( "NAS" );
    poDriver->SetMetadataItem( GDAL_DCAP_VECTOR, "YES" );
    poDriver->SetMetadataItem( GDAL_DMD_LONGNAME, "NAS - ALKIS" );
    poDriver->SetMetadataItem( GDAL_DMD_EXTENSION, "xml" );
    poDriver->SetMetadataItem( GDAL_DMD_HELPTOPIC, "drv_nas.html" );
    poDriver->SetMetadataItem( GDAL_DCAP_VIRTUALIO, "YES" );

    poDriver->pfnOpen = OGRNASDriverOpen;
    poDriver->pfnIdentify = OGRNASDriverIdentify;

    GetGDALDriverManager()->RegisterDriver( poDriver );
}