/******************************************************************************
 *
 * Project:  ODS Translator
 * Purpose:  Definition of classes for OGR OpenOfficeSpreadsheet .ods driver.
 * Author:   Even Rouault, even dot rouault at spatialys.com
 *
 ******************************************************************************
 * Copyright (c) 2012, Even Rouault <even dot rouault at spatialys.com>
 *
 * SPDX-License-Identifier: MIT
 ****************************************************************************/

#ifndef OGR_ODS_H_INCLUDED
#define OGR_ODS_H_INCLUDED

#include "ogrsf_frmts.h"
#include "memdataset.h"

#include "ogr_expat.h"

#include <vector>
#include <string>
#include <set>

namespace OGRODS
{

/************************************************************************/
/*                             OGRODSLayer                              */
/************************************************************************/

class OGRODSDataSource;

class OGRODSLayer final : public OGRMemLayer
{
    OGRODSDataSource *poDS;
    bool bUpdated;
    bool bHasHeaderLine;
    OGRFeatureQuery *m_poAttrQueryODS;

    GIntBig TranslateFIDFromMemLayer(GIntBig nFID) const;
    GIntBig TranslateFIDToMemLayer(GIntBig nFID) const;

  public:
    OGRODSLayer(OGRODSDataSource *poDSIn, const char *pszName,
                bool bUpdateIn = FALSE);
    ~OGRODSLayer() override;

    void SetUpdated(bool bUpdatedIn = true);

    bool GetHasHeaderLine()
    {
        return bHasHeaderLine;
    }

    void SetHasHeaderLine(bool bIn)
    {
        bHasHeaderLine = bIn;
    }

    const char *GetName() const override
    {
        return OGRMemLayer::GetLayerDefn()->GetName();
    }

    OGRwkbGeometryType GetGeomType() const override
    {
        return wkbNone;
    }

    const OGRSpatialReference *GetSpatialRef() const override
    {
        return nullptr;
    }

    /* For external usage. Mess with FID */
    OGRFeature *GetNextFeature() override;
    OGRFeature *GetFeature(GIntBig nFeatureId) override;
    OGRErr ISetFeature(OGRFeature *poFeature) override;
    OGRErr IUpdateFeature(OGRFeature *poFeature, int nUpdatedFieldsCount,
                          const int *panUpdatedFieldsIdx,
                          int nUpdatedGeomFieldsCount,
                          const int *panUpdatedGeomFieldsIdx,
                          bool bUpdateStyleString) override;
    OGRErr DeleteFeature(GIntBig nFID) override;

    GIntBig GetFeatureCount(int) override;

    OGRErr SetAttributeFilter(const char *pszQuery) override;

    int TestCapability(const char *pszCap) const override;

    /* For internal usage, for cell resolver */
    OGRFeature *GetNextFeatureWithoutFIDHack()
    {
        return OGRMemLayer::GetNextFeature();
    }

    OGRErr SetFeatureWithoutFIDHack(OGRFeature *poFeature)
    {
        SetUpdated();
        return OGRMemLayer::ISetFeature(poFeature);
    }

    OGRErr ICreateFeature(OGRFeature *poFeature) override;

    virtual OGRErr CreateField(const OGRFieldDefn *poField,
                               int bApproxOK = TRUE) override
    {
        SetUpdated();
        return OGRMemLayer::CreateField(poField, bApproxOK);
    }

    OGRErr DeleteField(int iField) override
    {
        SetUpdated();
        return OGRMemLayer::DeleteField(iField);
    }

    OGRErr ReorderFields(int *panMap) override
    {
        SetUpdated();
        return OGRMemLayer::ReorderFields(panMap);
    }

    virtual OGRErr AlterFieldDefn(int iField, OGRFieldDefn *poNewFieldDefn,
                                  int nFlagsIn) override
    {
        SetUpdated();
        return OGRMemLayer::AlterFieldDefn(iField, poNewFieldDefn, nFlagsIn);
    }

    OGRErr SyncToDisk() override;

    GDALDataset *GetDataset() override;
};

/************************************************************************/
/*                           OGRODSDataSource                           */
/************************************************************************/
#define STACK_SIZE 5

typedef enum
{
    STATE_DEFAULT,
    STATE_TABLE,
    STATE_ROW,
    STATE_CELL,
    STATE_TEXTP,
} HandlerStateEnum;

typedef struct
{
    HandlerStateEnum eVal;
    int nBeginDepth;
} HandlerState;

class OGRODSDataSource final : public GDALDataset
{
    char *pszName;
    bool bUpdatable;
    bool bUpdated;
    bool bAnalysedFile;

    int nLayers;
    OGRLayer **papoLayers;

    VSILFILE *fpSettings;
    std::string osCurrentConfigTableName;
    std::string osConfigName;
    int nVerticalSplitFlags;
    std::set<std::string> osSetLayerHasSplitter;
    void AnalyseSettings();

    VSILFILE *fpContent;
    void AnalyseFile();

    bool bFirstLineIsHeaders;
    int bAutodetectTypes;

    XML_Parser oParser;
    bool bStopParsing;
    int nWithoutEventCounter;
    int nDataHandlerCounter;
    int nCurLine;
    int nEmptyRowsAccumulated;
    int nRowsRepeated;
    int nCurCol;
    int nCellsRepeated;
    // Accumulated memory allocations related to repeated cells.
    size_t m_nAccRepeatedMemory = 0;
    bool bEndTableParsing;

    OGRODSLayer *poCurLayer;

    int nStackDepth;
    int nDepth;
    HandlerState stateStack[STACK_SIZE];

    CPLString osValueType;
    CPLString osValue;
    bool m_bValueFromTableCellAttribute = false;
    std::string osFormula;

    std::vector<std::string> apoFirstLineValues;
    std::vector<std::string> apoFirstLineTypes;
    std::vector<std::string> apoCurLineValues;
    std::vector<std::string> apoCurLineTypes;

    void PushState(HandlerStateEnum eVal);
    void startElementDefault(const char *pszName, const char **ppszAttr);
    void startElementTable(const char *pszName, const char **ppszAttr);
    void endElementTable(const char *pszName);
    void startElementRow(const char *pszName, const char **ppszAttr);
    void endElementRow(const char *pszName);
    void startElementCell(const char *pszName, const char **ppszAttr);
    void endElementCell(const char *pszName);
    void dataHandlerTextP(const char *data, int nLen);

    void DetectHeaderLine();

    OGRFieldType GetOGRFieldType(const char *pszValue, const char *pszValueType,
                                 OGRFieldSubType &eSubType);

    void DeleteLayer(const char *pszLayerName);

    void FillRepeatedCells(bool wasLastCell);

  public:
    explicit OGRODSDataSource(CSLConstList papszOpenOptionsIn);
    ~OGRODSDataSource() override;
    CPLErr Close() override;

    int Open(const char *pszFilename, VSILFILE *fpContentIn,
             VSILFILE *fpSettingsIn, int bUpdatableIn);
    int Create(const char *pszName, char **papszOptions);

    int GetLayerCount() const override;
    const OGRLayer *GetLayer(int) const override;

    int TestCapability(const char *) const override;

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

    OGRErr DeleteLayer(int iLayer) override;

    CPLErr FlushCache(bool bAtClosing) override;

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

    void startElementStylesCbk(const char *pszName, const char **ppszAttr);
    void endElementStylesCbk(const char *pszName);
    void dataHandlerStylesCbk(const char *data, int nLen);

    bool GetUpdatable()
    {
        return bUpdatable;
    }

    void SetUpdated()
    {
        bUpdated = true;
    }
};

}  // namespace OGRODS

#endif /* ndef OGR_ODS_H_INCLUDED */
