/******************************************************************************
 *
 * Project:  Erdas Imagine (.img) Translator
 * Purpose:  Private class declarations for the HFA classes used to read
 *           Erdas Imagine (.img) files.  Public (C callable) declarations
 *           are in hfa.h.
 * Author:   Frank Warmerdam, warmerdam@pobox.com
 *
 ******************************************************************************
 * Copyright (c) 1999, Intergraph Corporation
 *
 * SPDX-License-Identifier: MIT
 ****************************************************************************/

#ifndef HFA_P_H_INCLUDED
#define HFA_P_H_INCLUDED

#include "cpl_port.h"
#include "hfa.h"

#include <cstdio>
#include <memory>
#include <vector>
#include <set>

#include "cpl_error.h"
#include "cpl_vsi.h"
#include "ogr_spatialref.h"

#ifdef CPL_LSB
#define HFAStandard(n, p)                                                      \
    {                                                                          \
    }
#else
void HFAStandard(int, void *);
#endif

#include "hfa.h"

class HFABand;
class HFADictionary;
class HFAEntry;
class HFASpillFile;
class HFAType;

/************************************************************************/
/*      Flag indicating read/write, or read-only access to data.        */
/************************************************************************/
typedef enum
{
    /*! Read only (no update) access */ HFA_ReadOnly = 0,
    /*! Read/write access. */ HFA_Update = 1
} HFAAccess;

/************************************************************************/
/*                              HFAInfo_t                               */
/*                                                                      */
/*      This is just a structure, and used hold info about the whole    */
/*      dataset within hfaopen.cpp                                      */
/************************************************************************/
struct hfainfo
{
    VSILFILE *fp;

    char *pszPath;
    char *pszFilename;     // Sans path.
    char *pszIGEFilename;  // Sans path.

    HFAAccess eAccess;

    GUInt32 nEndOfFile;
    GUInt32 nRootPos;
    GUInt32 nDictionaryPos;

    GInt16 nEntryHeaderLength;
    GInt32 nVersion;

    bool bTreeDirty;
    HFAEntry *poRoot;

    HFADictionary *poDictionary;
    char *pszDictionary;

    int nXSize;
    int nYSize;

    int nBands;
    HFABand **papoBand;

    void *pMapInfo;
    void *pDatum;
    void *pProParameters;

    struct hfainfo *psDependent;
};

typedef struct hfainfo HFAInfo_t;

GUInt32 HFAAllocateSpace(HFAInfo_t *, GUInt32);
CPLErr HFAParseBandInfo(HFAInfo_t *);
HFAInfo_t *HFAGetDependent(HFAInfo_t *, const char *);
HFAInfo_t *HFACreateDependent(HFAInfo_t *psBase);
bool HFACreateSpillStack(HFAInfo_t *, int nXSize, int nYSize, int nLayers,
                         int nBlockSize, EPTType eDataType,
                         GIntBig *pnValidFlagsOffset, GIntBig *pnDataOffset);

const char *const *GetHFAAuxMetaDataList();

double *HFAReadBFUniqueBins(HFAEntry *poBinFunc, int nPCTColors);

int CPL_DLL HFACreateLayer(HFAHandle psInfo, HFAEntry *poParent,
                           const char *pszLayerName, int bOverview,
                           int nBlockSize, int bCreateCompressed,
                           int bCreateLargeRaster, int bDependentLayer,
                           int nXSize, int nYSize, EPTType eDataType,
                           char **papszOptions,

                           // These are only related to external (large) files.
                           GIntBig nStackValidFlagsOffset,
                           GIntBig nStackDataOffset, int nStackCount,
                           int nStackIndex);

std::unique_ptr<OGRSpatialReference>
HFAPCSStructToOSR(const Eprj_Datum *psDatum, const Eprj_ProParameters *psPro,
                  const Eprj_MapInfo *psMapInfo, HFAEntry *poMapInformation);

const char *const *HFAGetDatumMap();
const char *const *HFAGetUnitMap();

/************************************************************************/
/*                               HFABand                                */
/************************************************************************/

class HFABand final
{
    int nBlocks;

    // Used for single-file modification.
    vsi_l_offset *panBlockStart;
    int *panBlockSize;
    int *panBlockFlag;

    // Used for spill-file modification.
    vsi_l_offset nBlockStart;
    vsi_l_offset nBlockSize;
    int nLayerStackCount;
    int nLayerStackIndex;

#define BFLG_VALID 0x01
#define BFLG_COMPRESSED 0x02

    int nPCTColors;
    double *apadfPCT[4];
    double *padfPCTBins;

    CPLErr LoadBlockInfo();
    CPLErr LoadExternalBlockInfo();

    void ReAllocBlock(int iBlock, int nSize);
    void NullBlock(void *);

    CPLString osOverName;

    CPL_DISALLOW_COPY_ASSIGN(HFABand)

  public:
    HFABand(HFAInfo_t *, HFAEntry *);
    ~HFABand();

    HFAInfo_t *psInfo;

    VSILFILE *fpExternal;

    EPTType eDataType;
    HFAEntry *poNode;

    int nBlockXSize;
    int nBlockYSize;

    int nWidth;
    int nHeight;

    int nBlocksPerRow;
    int nBlocksPerColumn;

    bool bNoDataSet;
    double dfNoData;

    bool bOverviewsPending;
    int nOverviews;
    HFABand **papoOverviews;

    CPLErr GetRasterBlock(int nXBlock, int nYBlock, void *pData, int nDataSize);
    CPLErr SetRasterBlock(int nXBlock, int nYBlock, void *pData);

    const char *GetBandName();
    void SetBandName(const char *pszName);

    CPLErr SetNoDataValue(double dfValue);

    CPLErr GetPCT(int *, double **, double **, double **, double **, double **);
    CPLErr SetPCT(int, const double *, const double *, const double *,
                  const double *);

    int CreateOverview(int nOverviewLevel, const char *pszResampling);
    CPLErr CleanOverviews();

    CPLErr LoadOverviews();
};

/************************************************************************/
/*                               HFAEntry                               */
/*                                                                      */
/*      Base class for all entry types.  Most entry types do not        */
/*      have a subclass, and are just handled generically with this     */
/*      class.                                                          */
/************************************************************************/
class HFAEntry final
{
    bool bDirty;
    GUInt32 nFilePos;

    HFAInfo_t *psHFA;
    HFAEntry *poParent;
    HFAEntry *poPrev;

    GUInt32 nNextPos;
    HFAEntry *poNext;

    GUInt32 nChildPos;
    HFAEntry *poChild;

    char szName[64];
    char szType[32];

    HFAType *poType;

    GUInt32 nDataPos;
    GUInt32 nDataSize;
    GByte *pabyData;

    void LoadData();

    bool GetFieldValue(const char *, char, void *, int *pnRemainingDataSize);
    CPLErr SetFieldValue(const char *, char, void *);

    bool bIsMIFObject;

    HFAEntry();
    HFAEntry(const char *pszDictionary, const char *pszTypeName,
             int nDataSizeIn, GByte *pabyDataIn);
    std::vector<HFAEntry *> FindChildren(const char *pszName,
                                         const char *pszType, int nRecLevel,
                                         int *pbErrorDetected);

    CPL_DISALLOW_COPY_ASSIGN(HFAEntry)

  public:
    static HFAEntry *New(HFAInfo_t *psHFA, GUInt32 nPos, HFAEntry *poParent,
                         HFAEntry *poPrev) CPL_WARN_UNUSED_RESULT;

    HFAEntry(HFAInfo_t *psHFA, const char *pszNodeName, const char *pszTypeName,
             HFAEntry *poParent);

    static HFAEntry *New(HFAInfo_t *psHFA, const char *pszNodeName,
                         const char *pszTypeName,
                         HFAEntry *poParent) CPL_WARN_UNUSED_RESULT;

    ~HFAEntry();

    static HFAEntry *BuildEntryFromMIFObject(HFAEntry *poContainer,
                                             const char *pszMIFObjectPath)
        CPL_WARN_UNUSED_RESULT;

    CPLErr RemoveAndDestroy();

    GUInt32 GetFilePos() const CPL_WARN_UNUSED_RESULT
    {
        return nFilePos;
    }

    const char *GetName() const CPL_WARN_UNUSED_RESULT
    {
        return szName;
    }

    void SetName(const char *pszNodeName);

    const char *GetType() const CPL_WARN_UNUSED_RESULT
    {
        return szType;
    }

    HFAType *GetTypeObject() CPL_WARN_UNUSED_RESULT;

    GByte *GetData() CPL_WARN_UNUSED_RESULT
    {
        LoadData();
        return pabyData;
    }

    GUInt32 GetDataPos() const CPL_WARN_UNUSED_RESULT
    {
        return nDataPos;
    }

    GUInt32 GetDataSize() const CPL_WARN_UNUSED_RESULT
    {
        return nDataSize;
    }

    HFAEntry *GetChild() CPL_WARN_UNUSED_RESULT;
    HFAEntry *GetNext() CPL_WARN_UNUSED_RESULT;
    HFAEntry *GetNamedChild(const char *) CPL_WARN_UNUSED_RESULT;
    std::vector<HFAEntry *>
    FindChildren(const char *pszName,
                 const char *pszType) CPL_WARN_UNUSED_RESULT;

    GInt32 GetIntField(const char *, CPLErr * = nullptr) CPL_WARN_UNUSED_RESULT;
    double GetDoubleField(const char *,
                          CPLErr * = nullptr) CPL_WARN_UNUSED_RESULT;
    const char *
    GetStringField(const char *, CPLErr * = nullptr,
                   int *pnRemainingDataSize = nullptr) CPL_WARN_UNUSED_RESULT;
    GIntBig GetBigIntField(const char *,
                           CPLErr * = nullptr) CPL_WARN_UNUSED_RESULT;
    int GetFieldCount(const char *, CPLErr * = nullptr) CPL_WARN_UNUSED_RESULT;

    CPLErr SetIntField(const char *, int);
    CPLErr SetDoubleField(const char *, double);
    CPLErr SetStringField(const char *, const char *);

    void DumpFieldValues(FILE *, const char * = nullptr);

    void SetPosition();
    CPLErr FlushToDisk();

    void MarkDirty();
    GByte *MakeData(int nSize = 0);
};

/************************************************************************/
/*                               HFAField                               */
/*                                                                      */
/*      A field in a HFAType in the dictionary.                         */
/************************************************************************/

class HFAField final
{
  public:
    int nBytes;

    int nItemCount;
    // TODO(schwehr): Rename chPointer to something more meaningful.
    // It's not a pointer.
    char chPointer;   // '\0', '*' or 'p'
    char chItemType;  // 1|2|4|e|...

    char *pszItemObjectType;  // if chItemType == 'o'
    HFAType *poItemObjectType;

    char **papszEnumNames;  // Normally NULL if not an enum.

    char *pszFieldName;

    char szNumberString[36];  // Buffer used to return int as a string.

    HFAField();
    ~HFAField();

    const char *Initialize(const char *);

    bool CompleteDefn(HFADictionary *);

    void Dump(FILE *);

    bool ExtractInstValue(const char *pszField, int nIndexValue,
                          GByte *pabyData, GUInt32 nDataOffset, int nDataSize,
                          char chReqType, void *pReqReturn,
                          int *pnRemainingDataSize = nullptr);

    CPLErr SetInstValue(const char *pszField, int nIndexValue, GByte *pabyData,
                        GUInt32 nDataOffset, int nDataSize, char chReqType,
                        void *pValue);

    void DumpInstValue(FILE *fpOut, GByte *pabyData, GUInt32 nDataOffset,
                       int nDataSize, const char *pszPrefix = nullptr);

    int GetInstBytes(GByte *, int, std::set<HFAField *> &oVisitedFields);
    int GetInstCount(GByte *pabyData, int nDataSize) const;
};

/************************************************************************/
/*                               HFAType                                */
/*                                                                      */
/*      A type in the dictionary.                                       */
/************************************************************************/

class HFAType
{
    bool bInCompleteDefn;

  public:
    int nBytes;

    std::vector<std::unique_ptr<HFAField>> apoFields;

    char *pszTypeName;

    HFAType();
    ~HFAType();

    const char *Initialize(const char *);

    bool CompleteDefn(HFADictionary *);

    void Dump(FILE *);

    int GetInstBytes(GByte *, int, std::set<HFAField *> &oVisitedFields) const;
    int GetInstCount(const char *pszField, GByte *pabyData, GUInt32 nDataOffset,
                     int nDataSize);
    bool ExtractInstValue(const char *pszField, GByte *pabyData,
                          GUInt32 nDataOffset, int nDataSize, char chReqType,
                          void *pReqReturn, int *pnRemainingDataSize);
    CPLErr SetInstValue(const char *pszField, GByte *pabyData,
                        GUInt32 nDataOffset, int nDataSize, char chReqType,
                        void *pValue);
    void DumpInstValue(FILE *fpOut, GByte *pabyData, GUInt32 nDataOffset,
                       int nDataSize, const char *pszPrefix = nullptr) const;
};

/************************************************************************/
/*                            HFADictionary                             */
/************************************************************************/

class HFADictionary
{
  public:
    explicit HFADictionary(const char *pszDict);
    ~HFADictionary();

    HFAType *FindType(const char *);
    void AddType(HFAType *);

    static int GetItemSize(char);

    void Dump(FILE *);

  private:
    int nTypes;
    int nTypesMax;
    HFAType **papoTypes;

    CPL_DISALLOW_COPY_ASSIGN(HFADictionary)

  public:
    // TODO(schwehr): Make these members private.
    CPLString osDictionaryText;
    bool bDictionaryTextDirty;
};

/************************************************************************/
/*                             HFACompress                              */
/*                                                                      */
/*      Class that given a block of memory compresses the contents      */
/*      using run length encoding (RLE) as used by Imagine.             */
/************************************************************************/

class HFACompress
{
  public:
    HFACompress(void *pData, GUInt32 nBlockSize, EPTType eDataType);
    ~HFACompress();

    // This is the method that does the work.
    bool compressBlock();

    // Static method to allow us to query whether HFA type supported.
    static bool QueryDataTypeSupported(EPTType eHFADataType);

    // Get methods - only valid after compressBlock has been called.
    GByte *getCounts() const
    {
        return m_pCounts;
    }

    GUInt32 getCountSize() const
    {
        return m_nSizeCounts;
    }

    GByte *getValues() const
    {
        return m_pValues;
    }

    GUInt32 getValueSize() const
    {
        return m_nSizeValues;
    }

    GUInt32 getMin() const
    {
        return m_nMin;
    }

    GUInt32 getNumRuns() const
    {
        return m_nNumRuns;
    }

    GByte getNumBits() const
    {
        return m_nNumBits;
    }

  private:
    static void makeCount(GUInt32 count, GByte *pCounter, GUInt32 *pnSizeCount);
    GUInt32 findMin(GByte *pNumBits);
    GUInt32 valueAsUInt32(GUInt32 index);
    void encodeValue(GUInt32 val, GUInt32 repeat);

    void *m_pData;
    GUInt32 m_nBlockSize;
    GUInt32 m_nBlockCount;
    EPTType m_eDataType;
    // The number of bits the datatype we are trying to compress takes.
    int m_nDataTypeNumBits;

    GByte *m_pCounts;
    GByte *m_pCurrCount;
    GUInt32 m_nSizeCounts;

    GByte *m_pValues;
    GByte *m_pCurrValues;
    GUInt32 m_nSizeValues;

    GUInt32 m_nMin;
    GUInt32 m_nNumRuns;
    // The number of bits needed to compress the range of values in the block.
    GByte m_nNumBits;
};

#endif /* ndef HFA_P_H_INCLUDED */