/******************************************************************************

 *

 * Project:  GDAL

 * Purpose:  gdal "vector concat" subcommand

 * Author:   Even Rouault <even dot rouault at spatialys.com>

 *

 ******************************************************************************

 * Copyright (c) 2025, Even Rouault <even dot rouault at spatialys.com>

 *

 * SPDX-License-Identifier: MIT

 ****************************************************************************/

#ifndef GDALALG_VECTOR_CONCAT_INCLUDED

#define GDALALG_VECTOR_CONCAT_INCLUDED

#include "gdalalg_vector_pipeline.h"

#include "ogrsf_frmts.h"

#include "ogrlayerpool.h"

//! @cond Doxygen_Suppress

/************************************************************************/

/*                      GDALVectorConcatAlgorithm                       */

/************************************************************************/

class GDALVectorConcatAlgorithm /* non final */

    : public GDALVectorPipelineStepAlgorithm

{

  public:

    static constexpr const char *NAME = "concat";

    static constexpr const char *DESCRIPTION = "Concatenate vector datasets.";

    static constexpr const char *HELP_URL = "/programs/gdal_vector_concat.html";

    explicit GDALVectorConcatAlgorithm(bool bStandalone = false);

    ~GDALVectorConcatAlgorithm() override;

    bool CanBeFirstStep() const override

    {

        return true;

    }

  private:

    bool RunStep(GDALPipelineStepRunContext &ctxt) override;

    bool RunImpl(GDALProgressFunc pfnProgress, void *pProgressData) override;

    std::string m_layerNameTemplate{};

    std::string m_sourceLayerFieldName{};

    std::string m_sourceLayerFieldContent{};

    std::string m_mode = "merge-per-layer-name";

    std::string m_fieldStrategy = "union";

    std::string m_srsCrs{};

    std::string m_dstCrs{};

    std::unique_ptr<OGRLayerPool> m_poLayerPool{};

    std::vector<std::unique_ptr<OGRLayer>> m_tempLayersKeeper{};

};

/************************************************************************/

/*                 GDALVectorConcatAlgorithmStandalone                  */

/************************************************************************/

class GDALVectorConcatAlgorithmStandalone final

    : public GDALVectorConcatAlgorithm

{

  public:

    GDALVectorConcatAlgorithmStandalone()

        : GDALVectorConcatAlgorithm(/* standaloneStep = */ true)

    {

    }

    ~GDALVectorConcatAlgorithmStandalone() override;

};

//! @endcond

#endif