/******************************************************************************
 * $Id $
 *
 * Project:  GeoRSS Translator
 * Purpose:  Definition of classes for OGR GeoRSS driver.
 * Author:   Even Rouault, even dot rouault at spatialys.com
 *
 ******************************************************************************
 * Copyright (c) 2008-2010, Even Rouault <even dot rouault at spatialys.com>
 *
 * SPDX-License-Identifier: MIT
 ****************************************************************************/

#ifndef OGR_GEORSS_H_INCLUDED
#define OGR_GEORSS_H_INCLUDED

#include "ogrsf_frmts.h"
#include "ogr_p.h"
#include "cpl_hash_set.h"

#ifdef HAVE_EXPAT
#include "ogr_expat.h"
#endif

constexpr int PARSER_BUF_SIZE = 8192;

class OGRGeoRSSDataSource;

typedef enum
{
    GEORSS_ATOM,
    GEORSS_RSS,
    GEORSS_RSS_RDF,
} OGRGeoRSSFormat;

typedef enum
{
    GEORSS_GML,
    GEORSS_SIMPLE,
    GEORSS_W3C_GEO
} OGRGeoRSSGeomDialect;

/************************************************************************/
/*                             OGRGeoRSSLayer                              */
/************************************************************************/

class OGRGeoRSSLayer final : public OGRLayer
{
    OGRFeatureDefn *poFeatureDefn;
    OGRSpatialReference *poSRS;
    OGRGeoRSSDataSource *poDS;
    OGRGeoRSSFormat eFormat;

    bool bWriteMode;
    int nTotalFeatureCount;

    // TODO(schwehr): Remove eof?
    bool eof;
    int nNextFID;
    VSILFILE *fpGeoRSS; /* Large file API */
    bool bHasReadSchema;
#ifdef HAVE_EXPAT
    XML_Parser oParser;
    XML_Parser oSchemaParser;
#endif
    OGRGeometry *poGlobalGeom;
    bool bStopParsing;
    bool bInFeature;
    bool hasFoundLat;
    bool hasFoundLon;
#ifdef HAVE_EXPAT
    double latVal;
    double lonVal;
#endif
    char *pszSubElementName;
    char *pszSubElementValue;
    int nSubElementValueLen;
#ifdef HAVE_EXPAT
    int iCurrentField;
#endif
    bool bInSimpleGeometry;
    bool bInGMLGeometry;
    bool bInGeoLat;
    bool bInGeoLong;
#ifdef HAVE_EXPAT
    bool bFoundGeom;
    bool bSameSRS;
#endif
    OGRwkbGeometryType eGeomType;
    char *pszGMLSRSName;
    bool bInTagWithSubTag;
    char *pszTagWithSubTag;
    int currentDepth;
    int featureDepth;
    int geometryDepth;
#ifdef HAVE_EXPAT
    OGRFieldDefn *currentFieldDefn;
    int nWithoutEventCounter;
    int nDataHandlerCounter;
#endif
    CPLHashSet *setOfFoundFields;

    OGRFeature *poFeature;
    OGRFeature **ppoFeatureTab;
    int nFeatureTabLength;
    int nFeatureTabIndex;

  private:
#ifdef HAVE_EXPAT
    void AddStrToSubElementValue(const char *pszStr);
#endif
    bool IsStandardField(const char *pszName);

  public:
    OGRGeoRSSLayer(const char *pszFilename, const char *layerName,
                   OGRGeoRSSDataSource *poDS, OGRSpatialReference *poSRSIn,
                   bool bWriteMode = false);
    ~OGRGeoRSSLayer() override;

    void ResetReading() override;
    OGRFeature *GetNextFeature() override;

    OGRErr ICreateFeature(OGRFeature *poFeature) override;
    OGRErr CreateField(const OGRFieldDefn *poField, int bApproxOK) override;

    OGRFeatureDefn *GetLayerDefn() override;

    int TestCapability(const char *) override;

    GIntBig GetFeatureCount(int bForce) override;

    GDALDataset *GetDataset() override;

    void LoadSchema();

#ifdef HAVE_EXPAT
    void startElementCbk(const char *pszName, const char **ppszAttr);
    void endElementCbk(const char *pszName);
    void dataHandlerCbk(const char *data, int nLen);

    void startElementLoadSchemaCbk(const char *pszName, const char **ppszAttr);
    void endElementLoadSchemaCbk(const char *pszName);
    void dataHandlerLoadSchemaCbk(const char *data, int nLen);
#endif
};

/************************************************************************/
/*                           OGRGeoRSSDataSource                        */
/************************************************************************/

typedef enum
{
    GEORSS_VALIDITY_UNKNOWN,
    GEORSS_VALIDITY_INVALID,
    GEORSS_VALIDITY_VALID
} OGRGeoRSSValidity;

class OGRGeoRSSDataSource final : public GDALDataset
{
    OGRGeoRSSLayer **papoLayers;
    int nLayers;

    /*  Export related */
    VSILFILE *fpOutput; /* Virtual file API */

#ifdef HAVE_EXPAT
    OGRGeoRSSValidity validity;
#endif
    OGRGeoRSSFormat eFormat;
    OGRGeoRSSGeomDialect eGeomDialect;
    bool bUseExtensions;
    bool bWriteHeaderAndFooter;
#ifdef HAVE_EXPAT
    XML_Parser oCurrentParser;
    int nDataHandlerCounter;
#endif

  public:
    OGRGeoRSSDataSource();
    ~OGRGeoRSSDataSource() override;

    int Open(const char *pszFilename, int bUpdate);

    int Create(const char *pszFilename, char **papszOptions);

    int GetLayerCount() override
    {
        return nLayers;
    }

    OGRLayer *GetLayer(int) override;

    OGRLayer *ICreateLayer(const char *pszName,
                           const OGRGeomFieldDefn *poGeomFieldDefn,
                           CSLConstList papszOptions) override;
    int TestCapability(const char *) override;

    VSILFILE *GetOutputFP()
    {
        return fpOutput;
    }

    OGRGeoRSSFormat GetFormat()
    {
        return eFormat;
    }

    OGRGeoRSSGeomDialect GetGeomDialect()
    {
        return eGeomDialect;
    }

    bool GetUseExtensions()
    {
        return bUseExtensions;
    }

#ifdef HAVE_EXPAT
    void startElementValidateCbk(const char *pszName, const char **ppszAttr);
    void dataHandlerValidateCbk(const char *data, int nLen);
#endif
};

#endif /* ndef _OGR_GeoRSS_H_INCLUDED */