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

 *

 * Project:  OpenGIS Simple Features Reference Implementation

 * Purpose:  Streaming parser for GeoJSON-like FeatureCollection

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

 *

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

 * Copyright (c) 2017, Even Rouault <even.rouault at spatialys.com>

 *

 * SPDX-License-Identifier: MIT

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

#ifndef OGRJSONCOLLECTIONSTREAMING_PARSER_H_INCLUDED

#define OGRJSONCOLLECTIONSTREAMING_PARSER_H_INCLUDED

#include "cpl_json_streaming_parser.h"

#include <json.h>  // JSON-C

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

/*                      OGRJSONCollectionStreamingParser                */

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

/** Streaming parser for GeoJSON-like FeatureCollection */

class OGRJSONCollectionStreamingParser CPL_NON_FINAL

    : public CPLJSonStreamingParser

{

    bool m_bFirstPass = false;

    int m_nDepth = 0;

    bool m_bInFeatures = false;

    bool m_bCanEasilyAppend = false;

    bool m_bInFeaturesArray = false;

    bool m_bInCoordinates = false;

    bool m_bInType = false;

    bool m_bIsTypeKnown = false;

    bool m_bIsFeatureCollection = false;

    json_object *m_poRootObj = nullptr;

    size_t m_nRootObjMemEstimate = 0;

    json_object *m_poCurObj = nullptr;

    size_t m_nCurObjMemEstimate = 0;

    GUIntBig m_nTotalOGRFeatureMemEstimate = 0;

    bool m_bKeySet = false;

    std::string m_osCurKey{};

    std::vector<json_object *> m_apoCurObj{};

    std::vector<bool> m_abFirstMember{};

    bool m_bStoreNativeData = false;

    std::string m_osJson{};

    size_t m_nMaxObjectSize = 0;

    bool m_bStartFeature = false;

    bool m_bEndFeature = false;

    void AppendObject(json_object *poNewObj);

    CPL_DISALLOW_COPY_ASSIGN(OGRJSONCollectionStreamingParser)

  protected:

    inline bool IsFirstPass() const

    {

        return m_bFirstPass;

    }

    virtual void GotFeature(json_object *poObj, bool bFirstPass,

                            const std::string &osJson) = 0;

    virtual void TooComplex() = 0;

  public:

    OGRJSONCollectionStreamingParser(bool bFirstPass, bool bStoreNativeData,

                                     size_t nMaxObjectSize);

    ~OGRJSONCollectionStreamingParser();

    virtual void String(const char * /*pszValue*/, size_t) override;

    virtual void Number(const char * /*pszValue*/, size_t) override;

    virtual void Boolean(bool b) override;

    virtual void Null() override;

    virtual void StartObject() override;

    virtual void EndObject() override;

    virtual void StartObjectMember(const char * /*pszKey*/, size_t) override;

    virtual void StartArray() override;

    virtual void EndArray() override;

    virtual void StartArrayMember() override;

    virtual void Exception(const char * /*pszMessage*/) override;

    json_object *StealRootObject();

    inline bool IsTypeKnown() const

    {

        return m_bIsTypeKnown;

    }

    inline bool IsFeatureCollection() const

    {

        return m_bIsFeatureCollection;

    }

    inline GUIntBig GetTotalOGRFeatureMemEstimate() const

    {

        return m_nTotalOGRFeatureMemEstimate;

    }

    inline bool CanEasilyAppend() const

    {

        return m_bCanEasilyAppend;

    }

    inline void ResetFeatureDetectionState()

    {

        m_bStartFeature = false;

        m_bEndFeature = false;

    }

    inline bool IsStartFeature() const

    {

        return m_bStartFeature;

    }

    inline bool IsEndFeature() const

    {

        return m_bEndFeature;

    }

};

#endif  // OGRJSONCOLLECTIONSTREAMING_PARSER_H_INCLUDED