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

 *

 * Project:  Sentinel SAFE products

 * Purpose:  Sentinel Products (manifest.safe) driver

 * Author:   Delfim Rego, delfimrego@gmail.com

 *

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

 * Copyright (c) 2015, Delfim Rego <delfimrego@gmail.com>

 *

 * SPDX-License-Identifier: MIT

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

#ifndef SAFEDATASET_H_INCLUDED

#define SAFEDATASET_H_INCLUDED

#include "cpl_minixml.h"

#include "cpl_string.h"

#include "gdal_frmts.h"

#include "gdal_pam.h"

#include "ogr_spatialref.h"

#include <set>

#include <map>

#include <chrono>

#include <ctime>

#include <iostream>

#include <thread>

#include <vector>

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

/* ==================================================================== */

/*                               SAFEDataset                            */

/* ==================================================================== */

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

class SAFEDataset final : public GDALPamDataset

{

    CPLXMLTreeCloser psManifest{nullptr};

    int nGCPCount = 0;

    GDAL_GCP *pasGCPList = nullptr;

    OGRSpatialReference m_oGCPSRS{};

    char **papszSubDatasets = nullptr;

    char **papszExtraFiles = nullptr;

    int m_nSubDSNum = 0;

  protected:

    int CloseDependentDatasets() override;

    static const CPLXMLNode *GetMetaDataObject(const CPLXMLNode *,

                                               const char *);

    static const CPLXMLNode *GetDataObject(const CPLXMLNode *, const char *);

    static const CPLXMLNode *GetDataObject(const CPLXMLNode *,

                                           const CPLXMLNode *, const char *);

    void AddSubDataset(const CPLString &osName, const CPLString &osDesc);

  public:

    SAFEDataset();

    ~SAFEDataset() override;

    int GetGCPCount() override;

    const OGRSpatialReference *GetGCPSpatialRef() const override;

    const GDAL_GCP *GetGCPs() override;

    char **GetMetadataDomainList() override;

    CSLConstList GetMetadata(const char *pszDomain = "") override;

    char **GetFileList(void) override;

    static GDALDataset *Open(GDALOpenInfo *);

    static int Identify(GDALOpenInfo *);

    const CPLXMLNode *GetManifest()

    {

        return psManifest.get();

    }

};

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

/* ==================================================================== */

/*                    SAFERasterBand                                    */

/* ==================================================================== */

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

class SAFERasterBand final : public GDALPamRasterBand

{

    std::unique_ptr<GDALDataset> poBandFile{};

  public:

    SAFERasterBand(SAFEDataset *poDSIn, GDALDataType eDataTypeIn,

                   const CPLString &osSwath, const CPLString &osPol,

                   std::unique_ptr<GDALDataset> &&poBandFileIn);

    CPLErr IReadBlock(int, int, void *) override;

    static GDALDataset *Open(GDALOpenInfo *);

};

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

/* ==================================================================== */

/*                    SAFESLCRasterBand                                 */

/* ==================================================================== */

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

class SAFESLCRasterBand final : public GDALPamRasterBand

{

  public:

    typedef enum BandType

    {

        COMPLEX = 0,

        INTENSITY

    } BandType;

    SAFESLCRasterBand(SAFEDataset *poDSIn, GDALDataType eDataTypeIn,

                      const CPLString &osSwath, const CPLString &osPol,

                      std::unique_ptr<GDALDataset> &&poBandFileIn,

                      BandType eBandType);

    CPLErr IReadBlock(int, int, void *) override;

    static GDALDataset *Open(GDALOpenInfo *);

  private:

    std::unique_ptr<GDALDataset> poBandFile{};

    BandType m_eBandType = COMPLEX;

    GDALDataType m_eInputDataType = GDT_Unknown;

};

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

/* ==================================================================== */

/*                   SAFECalibratedRasterBand                           */

/* ==================================================================== */

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

class SAFECalibratedRasterBand final : public GDALPamRasterBand

{

  public:

    typedef enum CalibrationType

    {

        SIGMA_NOUGHT = 0,

        BETA_NOUGHT,

        GAMMA

    } CalibrationType;

    SAFECalibratedRasterBand(SAFEDataset *poDSIn, GDALDataType eDataTypeIn,

                             const CPLString &osSwath,

                             const CPLString &osPolarization,

                             std::unique_ptr<GDALDataset> &&poBandDatasetIn,

                             const char *pszCalibrationFilename,

                             CalibrationType eCalibrationType);

    CPLErr IReadBlock(int, int, void *) override;

    bool ReadLUT();

    static GDALDataset *Open(GDALOpenInfo *);

  private:

    typedef std::chrono::system_clock::time_point TimePoint;

    std::unique_ptr<GDALDataset> poBandDataset{};

    GDALDataType m_eInputDataType = GDT_Unknown;

    std::vector<float> m_afTable;

    CPLString m_osCalibrationFilename;

    std::vector<int> m_anLineLUT;

    std::vector<int> m_anPixelLUT;

    TimePoint m_oStartTimePoint;

    TimePoint m_oStopTimePoint;

    int m_nNumPixels = 0;

    CPLStringList m_oAzimuthList;

    CalibrationType m_eCalibrationType = SIGMA_NOUGHT;

    static TimePoint getTimePoint(const char *pszTime);

    static double getTimeDiff(TimePoint oT1, TimePoint oT2);

    static TimePoint getazTime(TimePoint oStart, TimePoint oStop,

                               long nNumOfLines, int nOffset);

    int getCalibrationVectorIndex(int nLineNo);

    int getPixelIndex(int nPixelNo);

};

#endif