/******************************************************************************
 * $Id$
 *
 * Project:  jpip read driver
 * Purpose:  GDAL bindings for JPIP.
 * Author:   Norman Barker, ITT VIS, norman.barker@gmail.com
 *
 ******************************************************************************
 * ITT Visual Information Systems grants you use of this code, under the
following license:
 *
 * Copyright (c) 2000-2007, ITT Visual Information Solutions
 *
 * SPDX-License-Identifier: MIT
**/

#include "gdal_pam.h"
#include "gdaljp2metadata.h"
#include "cpl_conv.h"
#include "cpl_string.h"
#include "cpl_http.h"
#include "cpl_vsi.h"
#include "cpl_multiproc.h"

#include "jpipkak_headers.h"

#include <time.h>

#if KDU_MAJOR_VERSION > 7 || (KDU_MAJOR_VERSION == 7 && KDU_MINOR_VERSION >= 5)
using namespace kdu_core;
using namespace kdu_supp;
#endif

static void JPIPWorkerFunc(void *);

/************************************************************************/
/* ==================================================================== */
/*                           JPIPDataSegment                            */
/* ==================================================================== */
/************************************************************************/
class JPIPDataSegment
{
  private:
    long nId;
    long nAux;
    long nClassId;
    long nCodestream;
    long nOffset;
    long nLen;
    GByte *pabyData;
    int bIsFinal;
    int bIsEOR;

  public:
    long GetId() const
    {
        return nId;
    }

    long GetAux() const
    {
        return nAux;
    }

    long GetClassId() const
    {
        return nClassId;
    }

    long GetCodestreamIdx() const
    {
        return nCodestream;
    }

    long GetOffset() const
    {
        return nOffset;
    }

    long GetLen() const
    {
        return nLen;
    }

    GByte *GetData()
    {
        return pabyData;
    }

    int IsFinal() const
    {
        return bIsFinal;
    }

    int IsEOR() const
    {
        return bIsEOR;
    }

    void SetId(long nIdIn)
    {
        this->nId = nIdIn;
    }

    void SetAux(long nAuxIn)
    {
        this->nAux = nAuxIn;
    }

    void SetClassId(long nClassIdIn)
    {
        this->nClassId = nClassIdIn;
    }

    void SetCodestreamIdx(long nCodestreamIn)
    {
        this->nCodestream = nCodestreamIn;
    }

    void SetOffset(long nOffsetIn)
    {
        this->nOffset = nOffsetIn;
    }

    void SetLen(long nLenIn)
    {
        this->nLen = nLenIn;
    }

    void SetData(GByte *pabyDataIn)
    {
        this->pabyData = pabyDataIn;
    }

    void SetFinal(int bIsFinalIn)
    {
        this->bIsFinal = bIsFinalIn;
    }

    void SetEOR(int bIsEORIn)
    {
        this->bIsEOR = bIsEORIn;
    }

    JPIPDataSegment();
    ~JPIPDataSegment();
};

/************************************************************************/
/* ==================================================================== */
/*                           JPIPKAKDataset                             */
/* ==================================================================== */
/************************************************************************/

class JPIPKAKDataset final : public GDALPamDataset
{
  private:
    int bNeedReinitialize = FALSE;
    CPLString osRequestUrl;
    char *pszPath = nullptr;
    char *pszCid = nullptr;
    OGRSpatialReference m_oSRS{};

    int nPos = 0;
    int nVBASLen = 0;
    int nVBASFirstByte = 0;
    int nClassId = 0;
    int nQualityLayers = 0;
    int nResLevels = 0;
    int nComps = 0;
    int nBitDepth = 0;
    int bYCC = 0;
    GDALDataType eDT = GDT_Unknown;

    int nCodestream = 0;
    long nDatabins = 0;

    double adfGeoTransform[6];

    int bWindowDone = FALSE;
    int bGeoTransformValid = FALSE;

    int nGCPCount = 0;
    GDAL_GCP *pasGCPList = nullptr;

    // kakadu
    kdu_codestream *poCodestream = nullptr;
    kdu_region_decompressor *poDecompressor = nullptr;
    kdu_cache *poCache = nullptr;

    long ReadVBAS(GByte *pabyData, int nLen);
    JPIPDataSegment *ReadSegment(GByte *pabyData, int nLen, int &bError);
    int Initialize(const char *url, int bReinitializing);
    void Deinitialize();
    static int KakaduClassId(int nClassId);

    CPLMutex *pGlobalMutex = nullptr;

    // support two communication threads to the server, a main and an overview
    // thread
    volatile int bHighThreadRunning = 0;
    volatile int bLowThreadRunning = 0;
    volatile int bHighThreadFinished = 0;
    volatile int bLowThreadFinished = 0;

    // transmission counts
    volatile long nHighThreadByteCount = 0;
    volatile long nLowThreadByteCount = 0;

    static void KakaduInitialize();

  public:
    JPIPKAKDataset();
    virtual ~JPIPKAKDataset();

    // progressive methods
    virtual GDALAsyncReader *
    BeginAsyncReader(int xOff, int yOff, int xSize, int ySize, void *pBuf,
                     int bufXSize, int bufYSize, GDALDataType bufType,
                     int nBandCount, int *bandMap, int nPixelSpace,
                     int nLineSpace, int nBandSpace,
                     char **papszOptions) override;

    virtual void EndAsyncReader(GDALAsyncReader *) override;

    int GetNQualityLayers() const
    {
        return nQualityLayers;
    }

    int GetNResolutionLevels() const
    {
        return nResLevels;
    }

    int GetNComponents() const
    {
        return nComps;
    }

    int ReadFromInput(GByte *pabyData, int nLen, int &bError);

    int TestUseBlockIO(int nXOff, int nYOff, int nXSize, int nYSize,
                       int nBufXSize, int nBufYSize, GDALDataType eDataType,
                       int nBandCount, const int *panBandList) const;

    // gdaldataset methods
    virtual CPLErr GetGeoTransform(double *) override;
    const OGRSpatialReference *GetSpatialRef() const override;
    virtual int GetGCPCount() override;
    const OGRSpatialReference *GetGCPSpatialRef() const override;
    virtual const GDAL_GCP *GetGCPs() override;
    virtual CPLErr IRasterIO(GDALRWFlag eRWFlag, int nXOff, int nYOff,
                             int nXSize, int nYSize, void *pData, int nBufXSize,
                             int nBufYSize, GDALDataType eBufType,
                             int nBandCount, BANDMAP_TYPE panBandMap,
                             GSpacing nPixelSpace, GSpacing nLineSpace,
                             GSpacing nBandSpace,
                             GDALRasterIOExtraArg *psExtraArg) override;

    static GDALDataset *Open(GDALOpenInfo *);
    static const GByte JPIP_EOR_IMAGE_DONE = 1;
    static const GByte JPIP_EOR_WINDOW_DONE = 2;
    static const GByte MAIN_HEADER_DATA_BIN_CLASS = 6;
    static const GByte META_DATA_BIN_CLASS = 8;
    static const GByte PRECINCT_DATA_BIN_CLASS = 0;
    static const GByte TILE_HEADER_DATA_BIN_CLASS = 2;
    static const GByte TILE_DATA_BIN_CLASS = 4;

    friend class JPIPKAKAsyncReader;
    friend class JPIPKAKRasterBand;
    friend void JPIPWorkerFunc(void *);
};

/************************************************************************/
/* ==================================================================== */
/*                            JPIPKAKRasterBand                          */
/* ==================================================================== */
/************************************************************************/

class JPIPKAKRasterBand final : public GDALPamRasterBand
{
    friend class JPIPKAKDataset;

    JPIPKAKDataset *poBaseDS;

    int nDiscardLevels;

    kdu_dims band_dims;

    int nOverviewCount;
    JPIPKAKRasterBand **papoOverviewBand;

    kdu_codestream *oCodeStream;

    GDALColorTable oCT;
    GDALColorInterp eInterp;

  public:
    JPIPKAKRasterBand(int, int, kdu_codestream *, int, JPIPKAKDataset *);
    virtual ~JPIPKAKRasterBand();

    virtual CPLErr IReadBlock(int, int, void *) override;
    virtual CPLErr IRasterIO(GDALRWFlag, int, int, int, int, void *, int, int,
                             GDALDataType, GSpacing nPixelSpace,
                             GSpacing nLineSpace,
                             GDALRasterIOExtraArg *psExtraArg) override;

    virtual int GetOverviewCount() override;
    virtual GDALRasterBand *GetOverview(int) override;
};

/************************************************************************/
/* ==================================================================== */
/*                           JPIPKAKAsyncReader                         */
/* ==================================================================== */
/************************************************************************/

class JPIPKAKAsyncReader final : public GDALAsyncReader
{
  private:
    void *pAppBuf;
    int nAppPixelSpace, nAppLineSpace, nAppBandSpace;

    int nDataRead;
    int nLevel;
    int nQualityLayers;
    int bHighPriority;
    int bComplete;
    kdu_channel_mapping channels;
    kdu_coords exp_numerator, exp_denominator;

    kdu_dims rr_win;  // user requested window expressed on reduced res level

    void Start();
    void Stop();

  public:
    JPIPKAKAsyncReader();
    virtual ~JPIPKAKAsyncReader();

    virtual GDALAsyncStatusType
    GetNextUpdatedRegion(double timeout, int *pnxbufoff, int *pnybufoff,
                         int *pnxbufsize, int *pnybufsize) override;

    void SetComplete(int bFinished)
    {
        this->bComplete = bFinished;
    }

    friend class JPIPKAKDataset;

    CPLString osErrorMsg;
};

/************************************************************************/
/* ==================================================================== */
/*                           JPIPRequest                                */
/* ==================================================================== */
/************************************************************************/
struct JPIPRequest
{
    int bPriority;
    CPLString osRequest;
    JPIPKAKAsyncReader *poARIO;
};