/******************************************************************************
 *
 * Project:  MSSQL Spatial driver
 * Purpose:  Implements OGRMSSQLGeometryWriter class to write native
 *SqlGeometries. Author:   Tamas Szekeres, szekerest at gmail.com
 *
 ******************************************************************************
 * Copyright (c) 2016, Tamas Szekeres
 *
 * SPDX-License-Identifier: MIT
 ****************************************************************************/

#include "cpl_conv.h"
#include "ogr_mssqlspatial.h"

/*   SqlGeometry/SqlGeography serialization format

Simple Point (SerializationProps & IsSinglePoint)
  [SRID][0x01][SerializationProps][Point][z][m]

Simple Line Segment (SerializationProps & IsSingleLineSegment)
  [SRID][0x01][SerializationProps][Point1][Point2][z1][z2][m1][m2]

Complex Geometries
  [SRID][VersionAttribute][SerializationProps][NumPoints][Point1]..[PointN][z1]..[zN][m1]..[mN]
  [NumFigures][Figure]..[Figure][NumShapes][Shape]..[Shape]

Complex Geometries (FigureAttribute == Curve)
  [SRID][VersionAttribute][SerializationProps][NumPoints][Point1]..[PointN][z1]..[zN][m1]..[mN]
  [NumFigures][Figure]..[Figure][NumShapes][Shape]..[Shape][NumSegments][SegmentType]..[SegmentType]

VersionAttribute (1 byte)
  0x01 = Katmai (MSSQL2008+)
  0x02 = Denali (MSSQL2012+)

SRID
  Spatial Reference Id (4 bytes)

SerializationProps (bitmask) 1 byte
  0x01 = HasZValues
  0x02 = HasMValues
  0x04 = IsValid
  0x08 = IsSinglePoint
  0x10 = IsSingleLineSegment
  0x20 = IsLargerThanAHemisphere

Point (2-4)x8 bytes, size depends on SerializationProps & HasZValues &
HasMValues [x][y]                  - SqlGeometry [latitude][longitude]   -
SqlGeography

Figure
  [FigureAttribute][PointOffset]

FigureAttribute - Katmai (1 byte)
  0x00 = Interior Ring
  0x01 = Stroke
  0x02 = Exterior Ring

FigureAttribute - Denali (1 byte)
  0x00 = None
  0x01 = Line
  0x02 = Arc
  0x03 = Curve

Shape
  [ParentFigureOffset][FigureOffset][ShapeType]

ShapeType (1 byte)
  0x00 = Unknown
  0x01 = Point
  0x02 = LineString
  0x03 = Polygon
  0x04 = MultiPoint
  0x05 = MultiLineString
  0x06 = MultiPolygon
  0x07 = GeometryCollection
  -- Denali
  0x08 = CircularString
  0x09 = CompoundCurve
  0x0A = CurvePolygon
  0x0B = FullGlobe

SegmentType (1 byte)
  0x00 = Line
  0x01 = Arc
  0x02 = FirstLine
  0x03 = FirstArc

*/

/************************************************************************/
/*                        Geometry writer macros                        */
/************************************************************************/

#define WriteInt32(nPos, value)                                                \
    (*(reinterpret_cast<unsigned int *>(pszData + (nPos))) = value)

#define WriteByte(nPos, value) (pszData[nPos] = value)

#define WriteDouble(nPos, value)                                               \
    (*(reinterpret_cast<double *>(pszData + (nPos))) = value)

#define ParentOffset(iShape) (nShapePos + (iShape) * 9)
#define FigureOffset(iShape) (nShapePos + (iShape) * 9 + 4)
#define ShapeType(iShape) (nShapePos + (iShape) * 9 + 8)
#define SegmentType(iSegment) (nSegmentPos + (iSegment))

#define FigureAttribute(iFigure) (nFigurePos + (iFigure) * 5)
#define PointOffset(iFigure) (nFigurePos + (iFigure) * 5 + 1)

#define WriteX(iPoint, value) (WriteDouble(nPointPos + 16 * (iPoint), value))
#define WriteY(iPoint, value)                                                  \
    (WriteDouble(nPointPos + 16 * (iPoint) + 8, value))
#define WriteZ(iPoint, value)                                                  \
    (WriteDouble(nPointPos + 16 * nNumPoints + 8 * (iPoint), value))
#define WriteM(iPoint, value)                                                  \
    (WriteDouble(nPointPos + 24 * nNumPoints + 8 * (iPoint), value))

/************************************************************************/
/*                       OGRMSSQLGeometryWriter()                       */
/************************************************************************/

OGRMSSQLGeometryWriter::OGRMSSQLGeometryWriter(OGRGeometry *poGeometry,
                                               int nGeomColumnType, int nSRS)
{
    nColType = nGeomColumnType;
    nSRSId = nSRS;
    poGeom2 = poGeometry;

    chProps = 0;

    /* calculate required buffer length and the attributes */
    nPointSize = 16;
    if (poGeom2->getCoordinateDimension() == 3)
    {
        chProps |= SP_HASZVALUES;
        nPointSize += 8;
    }

    if (poGeom2->IsMeasured())
    {
        chProps |= SP_HASMVALUES;
        nPointSize += 8;
    }

    iPoint = 0;
    nNumPoints = 0;
    iFigure = 0;
    nNumFigures = 0;
    iShape = 0;
    nNumShapes = 0;
    iSegment = 0;
    nNumSegments = 0;

    /* calculate points figures, shapes and segments*/
    chVersion = VA_KATMAI;
    TrackGeometry(poGeom2);
    ++nNumShapes;

    OGRwkbGeometryType geomType = wkbFlatten(poGeom2->getGeometryType());

    if (nNumPoints == 1 && geomType == wkbPoint)
    {
        /* writing a single point */
        chProps |= SP_ISSINGLEPOINT | SP_ISVALID;
        nPointPos = 6;
        nLen = nPointPos + nPointSize;
    }
    else if (nNumPoints == 2 && geomType == wkbLineString)
    {
        /* writing a single line */
        chProps |= SP_ISSINGLELINESEGMENT | SP_ISVALID;
        nPointPos = 6;
        nLen = nPointPos + nPointSize * 2;
    }
    else
    {
        /* complex geometry */
        nPointPos = 10;
        nFigurePos = nPointPos + nPointSize * nNumPoints + 4;
        nShapePos = nFigurePos + 5 * nNumFigures + 4;
        nSegmentPos = nShapePos + 9 * nNumShapes + 4;
        if (nNumSegments > 0)
            nLen = nSegmentPos + nNumSegments;
        else
            nLen = nShapePos + 9 * nNumShapes;
    }
}

/************************************************************************/
/*                             WritePoint()                             */
/************************************************************************/

void OGRMSSQLGeometryWriter::WritePoint(OGRPoint *poGeom)
{
    if ((chProps & SP_HASZVALUES) && (chProps & SP_HASMVALUES))
        WritePoint(poGeom->getX(), poGeom->getY(), poGeom->getZ(),
                   poGeom->getM());
    else if (chProps & SP_HASZVALUES)
        WritePoint(poGeom->getX(), poGeom->getY(), poGeom->getZ());
    else if (chProps & SP_HASMVALUES)
        WritePoint(poGeom->getX(), poGeom->getY(), poGeom->getM());
    else
        WritePoint(poGeom->getX(), poGeom->getY());
}

void OGRMSSQLGeometryWriter::WritePoint(double x, double y)
{
    if (nColType == MSSQLCOLTYPE_GEOGRAPHY)
    {
        WriteY(iPoint, x);
        WriteX(iPoint, y);
    }
    else
    {
        WriteX(iPoint, x);
        WriteY(iPoint, y);
    }
    ++iPoint;
}

void OGRMSSQLGeometryWriter::WritePoint(double x, double y, double z)
{
    WriteZ(iPoint, z);
    WritePoint(x, y);
}

void OGRMSSQLGeometryWriter::WritePoint(double x, double y, double z, double m)
{
    WriteZ(iPoint, z);
    WriteM(iPoint, m);
    WritePoint(x, y);
}

/************************************************************************/
/*                          WriteSimpleCurve()                          */
/************************************************************************/

void OGRMSSQLGeometryWriter::WriteSimpleCurve(OGRSimpleCurve *poGeom,
                                              int iStartIndex, int nCount,
                                              bool bReversePoints)
{
    if (bReversePoints && iStartIndex == 0)
    {
        poGeom->reversePoints();
    }

    if ((chProps & SP_HASZVALUES) && (chProps & SP_HASMVALUES))
    {
        for (int i = iStartIndex; i < iStartIndex + nCount; i++)
            WritePoint(poGeom->getX(i), poGeom->getY(i), poGeom->getZ(i),
                       poGeom->getM(i));
    }
    else if (chProps & SP_HASZVALUES)
    {
        for (int i = iStartIndex; i < iStartIndex + nCount; i++)
            WritePoint(poGeom->getX(i), poGeom->getY(i), poGeom->getZ(i));
    }
    else if (chProps & SP_HASMVALUES)
    {
        for (int i = iStartIndex; i < iStartIndex + nCount; i++)
            WritePoint(poGeom->getX(i), poGeom->getY(i), poGeom->getM(i));
    }
    else
    {
        for (int i = iStartIndex; i < iStartIndex + nCount; i++)
            WritePoint(poGeom->getX(i), poGeom->getY(i));
    }
}

void OGRMSSQLGeometryWriter::WriteSimpleCurve(OGRSimpleCurve *poGeom,
                                              int iStartIndex,
                                              bool bReversePoints)
{
    WriteSimpleCurve(poGeom, iStartIndex, poGeom->getNumPoints() - iStartIndex,
                     bReversePoints);
}

void OGRMSSQLGeometryWriter::WriteSimpleCurve(OGRSimpleCurve *poGeom,
                                              bool bReversePoints)
{
    WriteSimpleCurve(poGeom, 0, poGeom->getNumPoints(), bReversePoints);
}

/************************************************************************/
/*                         WriteCompoundCurve()                         */
/************************************************************************/

void OGRMSSQLGeometryWriter::WriteCompoundCurve(OGRCompoundCurve *poGeom)
{
    OGRSimpleCurve *poSubGeom;
    WriteByte(FigureAttribute(iFigure), FA_CURVE);
    WriteInt32(PointOffset(iFigure), iPoint);
    for (int i = 0; i < poGeom->getNumCurves(); i++)
    {
        poSubGeom = poGeom->getCurve(i)->toSimpleCurve();
        switch (wkbFlatten(poSubGeom->getGeometryType()))
        {
            case wkbLineString:
                if (i == 0)
                    WriteSimpleCurve(poSubGeom, false);
                else
                    WriteSimpleCurve(poSubGeom, 1, false);
                for (int j = 1; j < poSubGeom->getNumPoints(); j++)
                {
                    if (j == 1)
                        WriteByte(SegmentType(iSegment++), SMT_FIRSTLINE);
                    else
                        WriteByte(SegmentType(iSegment++), SMT_LINE);
                }
                break;

            case wkbCircularString:
                if (i == 0)
                    WriteSimpleCurve(poSubGeom, false);
                else
                    WriteSimpleCurve(poSubGeom, 1, false);
                for (int j = 2; j < poSubGeom->getNumPoints(); j += 2)
                {
                    if (j == 2)
                        WriteByte(SegmentType(iSegment++), SMT_FIRSTARC);
                    else
                        WriteByte(SegmentType(iSegment++), SMT_ARC);
                }
                break;

            default:
                break;
        }
    }
}

/************************************************************************/
/*                             WriteCurve()                             */
/************************************************************************/

void OGRMSSQLGeometryWriter::WriteCurve(OGRCurve *poGeom, bool bReversePoints)
{
    switch (wkbFlatten(poGeom->getGeometryType()))
    {
        case wkbLineString:
        case wkbLinearRing:
            WriteByte(FigureAttribute(iFigure), FA_LINE);
            WriteInt32(PointOffset(iFigure), iPoint);
            WriteSimpleCurve(poGeom->toSimpleCurve(), bReversePoints);
            ++iFigure;
            break;

        case wkbCircularString:
            WriteByte(FigureAttribute(iFigure), FA_ARC);
            WriteInt32(PointOffset(iFigure), iPoint);
            WriteSimpleCurve(poGeom->toSimpleCurve(), bReversePoints);
            ++iFigure;
            break;

        case wkbCompoundCurve:
            WriteCompoundCurve(poGeom->toCompoundCurve());
            ++iFigure;
            break;

        default:
            break;
    }
}

/************************************************************************/
/*                            WritePolygon()                            */
/************************************************************************/

void OGRMSSQLGeometryWriter::WritePolygon(OGRPolygon *poGeom)
{
    int r;
    OGRLinearRing *poRing = poGeom->getExteriorRing();

    if (poRing == nullptr)
        return;

    if (chVersion == VA_KATMAI)
        WriteByte(FigureAttribute(iFigure), FA_EXTERIORRING);
    else
        WriteByte(FigureAttribute(iFigure), FA_LINE);

    WriteInt32(PointOffset(iFigure), iPoint);
    WriteSimpleCurve(poRing, poRing->isClockwise() &&
                                 nColType == MSSQLCOLTYPE_GEOGRAPHY);
    ++iFigure;
    for (r = 0; r < poGeom->getNumInteriorRings(); r++)
    {
        /* write interior rings */
        poRing = poGeom->getInteriorRing(r);
        if (chVersion == VA_KATMAI)
            WriteByte(FigureAttribute(iFigure), FA_INTERIORRING);
        else
            WriteByte(FigureAttribute(iFigure), FA_LINE);

        WriteInt32(PointOffset(iFigure), iPoint);
        WriteSimpleCurve(poRing, !poRing->isClockwise() &&
                                     nColType == MSSQLCOLTYPE_GEOGRAPHY);
        ++iFigure;
    }
}

/************************************************************************/
/*                         WriteCurvePolygon()                          */
/************************************************************************/

void OGRMSSQLGeometryWriter::WriteCurvePolygon(OGRCurvePolygon *poGeom)
{
    if (poGeom->getExteriorRingCurve() == nullptr)
        return;

    WriteCurve(poGeom->getExteriorRingCurve(),
               poGeom->getExteriorRingCurve()->isClockwise() &&
                   nColType == MSSQLCOLTYPE_GEOGRAPHY);
    for (int r = 0; r < poGeom->getNumInteriorRings(); r++)
    {
        /* write interior rings */
        WriteCurve(poGeom->getInteriorRingCurve(r),
                   !poGeom->getInteriorRingCurve(r)->isClockwise() &&
                       nColType == MSSQLCOLTYPE_GEOGRAPHY);
    }
}

/************************************************************************/
/*                      WriteGeometryCollection()                       */
/************************************************************************/

void OGRMSSQLGeometryWriter::WriteGeometryCollection(
    OGRGeometryCollection *poGeom, int iParent)
{
    for (int i = 0; i < poGeom->getNumGeometries(); i++)
        WriteGeometry(poGeom->getGeometryRef(i), iParent);
}

/************************************************************************/
/*                           WriteGeometry()                            */
/************************************************************************/

void OGRMSSQLGeometryWriter::WriteGeometry(OGRGeometry *poGeom, int iParent)
{
    /* write shape */
    int iCurrentFigure = iFigure;
    int iCurrentShape = iShape;
    WriteInt32(ParentOffset(iShape), iParent);

    iParent = iShape;

    switch (wkbFlatten(poGeom->getGeometryType()))
    {
        case wkbPoint:
            WriteByte(ShapeType(iShape++), ST_POINT);
            if (!poGeom->IsEmpty())
            {
                if (chVersion == VA_KATMAI)
                    WriteByte(FigureAttribute(iFigure), FA_STROKE);
                else
                    WriteByte(FigureAttribute(iFigure), FA_LINE);
                WriteInt32(PointOffset(iFigure), iPoint);
                WritePoint(poGeom->toPoint());
                ++iFigure;
            }
            break;

        case wkbLineString:
            WriteByte(ShapeType(iShape++), ST_LINESTRING);
            if (!poGeom->IsEmpty())
            {
                if (chVersion == VA_KATMAI)
                    WriteByte(FigureAttribute(iFigure), FA_STROKE);
                else
                    WriteByte(FigureAttribute(iFigure), FA_LINE);
                WriteInt32(PointOffset(iFigure), iPoint);
                WriteSimpleCurve(poGeom->toSimpleCurve(), false);
                ++iFigure;
            }
            break;

        case wkbCircularString:
            WriteByte(ShapeType(iShape++), ST_CIRCULARSTRING);
            if (!poGeom->IsEmpty())
            {
                if (chVersion == VA_KATMAI)
                    WriteByte(FigureAttribute(iFigure), FA_STROKE);
                else
                    WriteByte(FigureAttribute(iFigure), FA_ARC);
                WriteInt32(PointOffset(iFigure), iPoint);
                WriteSimpleCurve(poGeom->toSimpleCurve(), false);
                ++iFigure;
            }
            break;

        case wkbCompoundCurve:
            WriteByte(ShapeType(iShape++), ST_COMPOUNDCURVE);
            if (!poGeom->IsEmpty())
            {
                WriteCompoundCurve(poGeom->toCompoundCurve());
                ++iFigure;
            }
            break;

        case wkbPolygon:
            WriteByte(ShapeType(iShape++), ST_POLYGON);
            WritePolygon(poGeom->toPolygon());
            break;

        case wkbCurvePolygon:
            WriteByte(ShapeType(iShape++), ST_CURVEPOLYGON);
            WriteCurvePolygon(poGeom->toCurvePolygon());
            break;

        case wkbMultiPoint:
            WriteByte(ShapeType(iShape++), ST_MULTIPOINT);
            WriteGeometryCollection(poGeom->toGeometryCollection(), iParent);
            break;

        case wkbMultiLineString:
            WriteByte(ShapeType(iShape++), ST_MULTILINESTRING);
            WriteGeometryCollection(poGeom->toGeometryCollection(), iParent);
            break;

        case wkbMultiPolygon:
            WriteByte(ShapeType(iShape++), ST_MULTIPOLYGON);
            WriteGeometryCollection(poGeom->toGeometryCollection(), iParent);
            break;

        case wkbGeometryCollection:
            WriteByte(ShapeType(iShape++), ST_GEOMETRYCOLLECTION);
            WriteGeometryCollection(poGeom->toGeometryCollection(), iParent);
            break;

        default:
            return;
    }
    // check if new figures have been added to shape
    WriteInt32(FigureOffset(iCurrentShape),
               iFigure == iCurrentFigure ? 0xFFFFFFFF : iCurrentFigure);
}

/************************************************************************/
/*                           TrackGeometry()                            */
/************************************************************************/

void OGRMSSQLGeometryWriter::TrackGeometry(OGRGeometry *poGeom)
{
    switch (wkbFlatten(poGeom->getGeometryType()))
    {
        case wkbPoint:
            if (!poGeom->IsEmpty())
            {
                ++nNumFigures;
                ++nNumPoints;
            }
            break;

        case wkbLineString:
            if (!poGeom->IsEmpty())
            {
                ++nNumFigures;
                nNumPoints += poGeom->toLineString()->getNumPoints();
            }
            break;

        case wkbCircularString:
            chVersion = VA_DENALI;
            if (!poGeom->IsEmpty())
            {
                ++nNumFigures;
                nNumPoints += poGeom->toCircularString()->getNumPoints();
            }
            break;

        case wkbCompoundCurve:
        {
            int c;
            chVersion = VA_DENALI;
            if (!poGeom->IsEmpty())
            {
                OGRCompoundCurve *g = poGeom->toCompoundCurve();
                OGRCurve *poSubGeom;
                ++nNumFigures;
                for (int i = 0; i < g->getNumCurves(); i++)
                {
                    poSubGeom = g->getCurve(i);
                    switch (wkbFlatten(poSubGeom->getGeometryType()))
                    {
                        case wkbLineString:
                            c = poSubGeom->toLineString()->getNumPoints();
                            if (c > 1)
                            {
                                if (i == 0)
                                    nNumPoints += c;
                                else
                                    nNumPoints += c - 1;
                                nNumSegments += c - 1;
                            }
                            break;

                        case wkbCircularString:
                            c = poSubGeom->toCircularString()->getNumPoints();
                            if (c > 2)
                            {
                                if (i == 0)
                                    nNumPoints += c;
                                else
                                    nNumPoints += c - 1;
                                nNumSegments += static_cast<int>((c - 1) / 2);
                            }
                            break;

                        default:
                            break;
                    }
                }
            }
        }
        break;

        case wkbPolygon:
        {
            OGRPolygon *g = poGeom->toPolygon();
            for (auto &&poIter : *g)
                TrackGeometry(poIter);
        }
        break;

        case wkbCurvePolygon:
        {
            chVersion = VA_DENALI;
            OGRCurvePolygon *g = poGeom->toCurvePolygon();
            for (auto &&poIter : *g)
                TrackGeometry(poIter);
        }
        break;

        case wkbMultiPoint:
        case wkbMultiLineString:
        case wkbMultiPolygon:
        case wkbGeometryCollection:
        {
            OGRGeometryCollection *g = poGeom->toGeometryCollection();
            for (auto &&poMember : *g)
            {
                TrackGeometry(poMember);
                ++nNumShapes;
            }
        }
        break;

        default:
            break;
    }
}

/************************************************************************/
/*                          WriteSqlGeometry()                          */
/************************************************************************/

OGRErr OGRMSSQLGeometryWriter::WriteSqlGeometry(unsigned char *pszBuffer,
                                                int nBufLen)
{
    pszData = pszBuffer;

    if (nBufLen < nLen)
        return OGRERR_FAILURE;

    OGRwkbGeometryType geomType = wkbFlatten(poGeom2->getGeometryType());

    if (nNumPoints == 1 && geomType == wkbPoint)
    {
        /* writing a single point */
        OGRPoint *g = poGeom2->toPoint();
        WriteInt32(0, nSRSId);
        WriteByte(4, VA_KATMAI);
        WriteByte(5, chProps);
        WritePoint(g);
    }
    else if (nNumPoints == 2 && geomType == wkbLineString)
    {
        /* writing a single line */
        OGRLineString *g = poGeom2->toLineString();
        WriteInt32(0, nSRSId);
        WriteByte(4, VA_KATMAI);
        WriteByte(5, chProps);

        if ((chProps & SP_HASZVALUES) && (chProps & SP_HASMVALUES))
        {
            WritePoint(g->getX(0), g->getY(0), g->getZ(0), g->getM(0));
            WritePoint(g->getX(1), g->getY(1), g->getZ(1), g->getM(1));
        }
        else if (chProps & SP_HASZVALUES)
        {
            WritePoint(g->getX(0), g->getY(0), g->getZ(0));
            WritePoint(g->getX(1), g->getY(1), g->getZ(1));
        }
        else if (chProps & SP_HASMVALUES)
        {
            WritePoint(g->getX(0), g->getY(0), g->getM(0));
            WritePoint(g->getX(1), g->getY(1), g->getM(1));
        }
        else
        {
            WritePoint(g->getX(0), g->getY(0));
            WritePoint(g->getX(1), g->getY(1));
        }
    }
    else
    {
        /* complex geometry */
        if (poGeom2->IsValid())
            chProps |= SP_ISVALID;

        WriteInt32(0, nSRSId);
        WriteByte(4, chVersion);
        WriteByte(5, chProps);
        WriteInt32(nPointPos - 4, nNumPoints);
        WriteInt32(nFigurePos - 4, nNumFigures);
        WriteInt32(nShapePos - 4, nNumShapes);
        if (nNumSegments > 0)
            WriteInt32(nSegmentPos - 4, nNumSegments);

        WriteGeometry(poGeom2, 0xFFFFFFFF);
    }
    return OGRERR_NONE;
}

#undef ParentOffset
#undef FigureOffset
#undef ShapeType
#undef SegmentType

#undef FigureAttribute
#undef PointOffset
#undef NextPointOffset
