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

 *

 * Project:  GDAL

 * Purpose:  Private header

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

 *

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

 * Copyright (c) 2018, Even Rouault <even dot rouault at spatialys dot com>

 *

 * SPDX-License-Identifier: MIT

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

#ifndef OGR_PROJ_P_H_INCLUDED

#define OGR_PROJ_P_H_INCLUDED

#include "proj.h"

#include "cpl_mem_cache.h"

#include <unordered_map>

#include <memory>

#include <utility>

/*! @cond Doxygen_Suppress */

PJ_CONTEXT CPL_DLL *OSRGetProjTLSContext();

void OSRCleanupTLSContext();

class OSRProjTLSCache

{

    struct OSRPJDeleter

    {

        void operator()(PJ *pj) const

        {

            proj_destroy(pj);

        }

    };

    typedef std::unique_ptr<PJ, OSRPJDeleter> UniquePtrPJ;

    struct EPSGCacheKey

    {

        int nCode_;

        bool bUseNonDeprecated_;

        bool bAddTOWGS84_;

        EPSGCacheKey(int nCode, bool bUseNonDeprecated, bool bAddTOWGS84)

            : nCode_(nCode), bUseNonDeprecated_(bUseNonDeprecated),

              bAddTOWGS84_(bAddTOWGS84)

        {

        }

        bool operator==(const EPSGCacheKey &other) const

        {

            return nCode_ == other.nCode_ &&

                   bUseNonDeprecated_ == other.bUseNonDeprecated_ &&

                   bAddTOWGS84_ == other.bAddTOWGS84_;

        }

    };

    struct EPSGCacheKeyHasher

    {

        std::size_t operator()(const EPSGCacheKey &k) const

        {

            return k.nCode_ | ((k.bUseNonDeprecated_ ? 1 : 0) << 16) |

                   ((k.bAddTOWGS84_ ? 1 : 0) << 17);

        }

    };

    PJ_CONTEXT *m_tlsContext =

        nullptr;  // never use it directly. use GetPJContext()

    lru11::Cache<EPSGCacheKey, UniquePtrPJ, lru11::NullLock,

                 std::unordered_map<EPSGCacheKey,

                                    typename std::list<lru11::KeyValuePair<

                                        EPSGCacheKey, UniquePtrPJ>>::iterator,

                                    EPSGCacheKeyHasher>>

        m_oCacheEPSG{};

    lru11::Cache<std::string, UniquePtrPJ> m_oCacheWKT{};

    PJ_CONTEXT *GetPJContext();

    OSRProjTLSCache(const OSRProjTLSCache &) = delete;

    OSRProjTLSCache &operator=(const OSRProjTLSCache &) = delete;

  public:

    explicit OSRProjTLSCache(PJ_CONTEXT *tlsContext) : m_tlsContext(tlsContext)

    {

    }

    void clear();

    PJ *GetPJForEPSGCode(int nCode, bool bUseNonDeprecated, bool bAddTOWGS84);

    void CachePJForEPSGCode(int nCode, bool bUseNonDeprecated, bool bAddTOWGS84,

                            PJ *pj);

    PJ *GetPJForWKT(const std::string &wkt);

    void CachePJForWKT(const std::string &wkt, PJ *pj);

};

OSRProjTLSCache *OSRGetProjTLSCache();

void OGRCTDumpStatistics();

void OSRCTCleanCache();

/*! @endcond Doxygen_Suppress */

#endif