/******************************************************************************
 *
 * Project:  OGR
 * Purpose:  Implements OGRAVCE00Layer class.
 * Author:   Frank Warmerdam, warmerdam@pobox.com
 *           James Flemer <jflemer@alum.rpi.edu>
 *
 ******************************************************************************
 * Copyright (c) 2002, Frank Warmerdam <warmerdam@pobox.com>
 * Copyright (c) 2006, James Flemer <jflemer@alum.rpi.edu>
 *
 * SPDX-License-Identifier: MIT
 ****************************************************************************/

#include "ogr_avc.h"
#include "ogr_api.h"
#include "cpl_conv.h"
#include "cpl_string.h"

#include <cstdlib>

/************************************************************************/
/*                           OGRAVCE00Layer()                           */
/************************************************************************/

OGRAVCE00Layer::OGRAVCE00Layer(OGRAVCDataSource *poDSIn,
                               AVCE00Section *psSectionIn)
    : OGRAVCLayer(psSectionIn->eType, poDSIn), psSection(psSectionIn),
      psRead(nullptr), poArcLayer(nullptr), nFeatureCount(-1),
      bNeedReset(false), nNextFID(1), psTableSection(nullptr),
      psTableRead(nullptr), pszTableFilename(nullptr), nTablePos(0),
      nTableBaseField(0), nTableAttrIndex(-1)
{
    SetupFeatureDefinition(psSection->pszName);
    /* psRead = AVCE00ReadOpenE00(psSection->pszFilename); */

#if 0
    szTableName[0] = '\0';
    if( psSection->eType == AVCFilePAL )
        sprintf( szTableName, "%s.PAT", poDS->GetCoverageName() );
    else if( psSection->eType == AVCFileRPL )
        sprintf( szTableName, "%s.PAT%s", poDS->GetCoverageName(),
                 psSectionIn->pszName );
    else if( psSection->eType == AVCFileARC )
        sprintf( szTableName, "%s.AAT", poDS->GetCoverageName() );
    else if( psSection->eType == AVCFileLAB )
    {
        AVCE00ReadPtr psInfo = ((OGRAVCE00DataSource *) poDS)->GetInfo();

        sprintf( szTableName, "%s.PAT", poDS->GetCoverageName() );

        for( int iSection = 0; iSection < psInfo->numSections; iSection++ )
        {
            if( psInfo->pasSections[iSection].eType == AVCFilePAL )
                nTableAttrIndex = poFeatureDefn->GetFieldIndex( "PolyId" );
        }
    }

#endif
}

/************************************************************************/
/*                          ~OGRAVCE00Layer()                           */
/************************************************************************/

OGRAVCE00Layer::~OGRAVCE00Layer()

{
    if (psRead)
    {
        AVCE00ReadCloseE00(psRead);
        psRead = nullptr;
    }

    if (psTableRead)
    {
        AVCE00ReadCloseE00(psTableRead);
        psTableRead = nullptr;
    }

    if (pszTableFilename)
    {
        CPLFree(pszTableFilename);
        pszTableFilename = nullptr;
    }
}

/************************************************************************/
/*                            ResetReading()                            */
/************************************************************************/

void OGRAVCE00Layer::ResetReading()

{
    if (psRead)
    {
        AVCE00ReadGotoSectionE00(psRead, psSection, 0);
    }

    if (psTableRead)
    {
        AVCE00ReadGotoSectionE00(psTableRead, psTableSection, 0);
    }

    m_bEOF = false;
    bNeedReset = false;
    nNextFID = 1;
}

/************************************************************************/
/*                             GetFeature()                             */
/************************************************************************/

OGRFeature *OGRAVCE00Layer::GetFeature(GIntBig nFID)

{
    if (nFID < 0 && nFID != SERIAL_ACCESS_FID)
        return nullptr;

    /* -------------------------------------------------------------------- */
    /*      If we haven't started yet, open the file now.                   */
    /* -------------------------------------------------------------------- */
    if (psRead == nullptr)
    {
        psRead = AVCE00ReadOpenE00(psSection->pszFilename);
        if (psRead == nullptr)
            return nullptr;
        /* advance to the specified line number */
        if (AVCE00ReadGotoSectionE00(psRead, psSection, 0) != 0)
            return nullptr;
        nNextFID = 1;
    }

    /* -------------------------------------------------------------------- */
    /*      Read the raw feature - the SERIAL_ACCESS_FID fid is a special flag
     */
    /*      indicating serial access.                                       */
    /* -------------------------------------------------------------------- */
    void *pFeature = nullptr;

    if (nFID == SERIAL_ACCESS_FID)
    {
        bLastWasSequential = true;

        while ((pFeature = AVCE00ReadNextObjectE00(psRead)) != nullptr &&
               psRead->hParseInfo->eFileType != AVCFileUnknown &&
               !MatchesSpatialFilter(pFeature))
        {
            nNextFID++;
        }
    }
    else
    {
        bNeedReset = true;

        if (nNextFID > nFID || bLastWasSequential)
        {
            bLastWasSequential = false;
            /* advance to the specified line number */
            if (AVCE00ReadGotoSectionE00(psRead, psSection, 0) != 0)
                return nullptr;
            nNextFID = 1;
        }

        do
        {
            pFeature = AVCE00ReadNextObjectE00(psRead);
            ++nNextFID;
        } while (nullptr != pFeature && nNextFID <= nFID);
    }

    if (pFeature == nullptr)
        return nullptr;
    if (eSectionType != psRead->hParseInfo->eFileType)
        return nullptr;

    /* -------------------------------------------------------------------- */
    /*      Translate the feature.                                          */
    /* -------------------------------------------------------------------- */
    OGRFeature *poFeature = TranslateFeature(pFeature);
    if (poFeature == nullptr)
        return nullptr;

    /* -------------------------------------------------------------------- */
    /*      LAB's we have to assign the FID to directly, since it           */
    /*      doesn't seem to be stored in the file structure.                */
    /* -------------------------------------------------------------------- */
    if (psSection->eType == AVCFileLAB)
    {
        if (nFID == SERIAL_ACCESS_FID)
            poFeature->SetFID(nNextFID++);
        else
            poFeature->SetFID(nFID);
    }

    /* -------------------------------------------------------------------- */
    /*      If this is a polygon layer, try to assemble the arcs to form    */
    /*      the whole polygon geometry.                                     */
    /* -------------------------------------------------------------------- */
    if (psSection->eType == AVCFilePAL || psSection->eType == AVCFileRPL)
    {
        FormPolygonGeometry(poFeature, static_cast<AVCPal *>(pFeature));
    }

    /* -------------------------------------------------------------------- */
    /*      If we have an attribute table, append the attributes now.       */
    /* -------------------------------------------------------------------- */
    AppendTableFields(poFeature);

    return poFeature;
}

/************************************************************************/
/*                           GetNextFeature()                           */
/************************************************************************/

OGRFeature *OGRAVCE00Layer::GetNextFeature()

{
    if (m_bEOF)
        return nullptr;

    if (bNeedReset)
        ResetReading();

    OGRFeature *poFeature = GetFeature(SERIAL_ACCESS_FID);

    // Skip universe polygon.
    if (poFeature != nullptr && poFeature->GetFID() == 1 &&
        psSection->eType == AVCFilePAL)
    {
        OGRFeature::DestroyFeature(poFeature);
        poFeature = GetFeature(SERIAL_ACCESS_FID);
    }

    while (poFeature != nullptr &&
           ((m_poAttrQuery != nullptr && !m_poAttrQuery->Evaluate(poFeature)) ||
            !FilterGeometry(poFeature->GetGeometryRef())))
    {
        OGRFeature::DestroyFeature(poFeature);
        poFeature = GetFeature(SERIAL_ACCESS_FID);
    }

    if (poFeature == nullptr)
        m_bEOF = true;

    return poFeature;
}

/************************************************************************/
/*                           TestCapability()                           */
/************************************************************************/

#if 0
int OGRAVCE00Layer::TestCapability( const char * pszCap )

{
    if( eSectionType == AVCFileARC && EQUAL(pszCap,OLCRandomRead) )
        return TRUE;

    return OGRAVCLayer::TestCapability( pszCap );
}
#endif

/************************************************************************/
/*                        FormPolygonGeometry()                         */
/*                                                                      */
/*      Collect all the arcs forming edges to this polygon and form     */
/*      them into the appropriate OGR geometry on the target feature.   */
/************************************************************************/

bool OGRAVCE00Layer::FormPolygonGeometry(OGRFeature *poFeature, AVCPal *psPAL)
{
    /* -------------------------------------------------------------------- */
    /*      Try to find the corresponding ARC layer if not already          */
    /*      recorded.                                                       */
    /* -------------------------------------------------------------------- */
    if (poArcLayer == nullptr)
    {
        for (int i = 0; i < poDS->GetLayerCount(); i++)
        {
            OGRAVCE00Layer *poLayer =
                static_cast<OGRAVCE00Layer *>(poDS->GetLayer(i));

            if (poLayer->eSectionType == AVCFileARC)
                poArcLayer = poLayer;
        }

        if (poArcLayer == nullptr)
            return false;
    }

    /* -------------------------------------------------------------------- */
    /*  Read all the arcs related to this polygon, making a working         */
    /*  copy of them since the one returned by AVC is temporary.            */
    /* -------------------------------------------------------------------- */
    OGRGeometryCollection oArcs;

    for (int iArc = 0; iArc < psPAL->numArcs; iArc++)
    {
        if (psPAL->pasArcs[iArc].nArcId == 0 ||
            psPAL->pasArcs[iArc].nArcId == INT_MIN)
        {
            continue;
        }

        // If the other side of the line is the same polygon then this
        // arc is a "bridge" arc and can be discarded.  If we don't discard
        // it, then we should double it as bridge arcs seem to only appear
        // once.  But by discarding it we ensure a multi-ring polygon will be
        // properly formed.
        if (psPAL->pasArcs[iArc].nAdjPoly == psPAL->nPolyId)
            continue;

        auto poArc = std::unique_ptr<OGRFeature>(
            poArcLayer->GetFeature(std::abs(psPAL->pasArcs[iArc].nArcId)));

        if (poArc == nullptr)
            return false;

        if (poArc->GetGeometryRef() == nullptr)
            return false;

        oArcs.addGeometryDirectly(poArc->StealGeometry());
    }

    OGRErr eErr;
    OGRGeometry *poPolygon = OGRGeometry::FromHandle(OGRBuildPolygonFromEdges(
        OGRGeometry::ToHandle(&oArcs), TRUE, FALSE, 0.0, &eErr));
    if (poPolygon != nullptr)
    {
        poPolygon->assignSpatialReference(GetSpatialRef());
        poFeature->SetGeometryDirectly(poPolygon);
    }

    return eErr == OGRERR_NONE;
}

/************************************************************************/
/*                          CheckSetupTable()                           */
/*                                                                      */
/*      Check if the named table exists, and if so, setup access to     */
/*      it (open it), and add its fields to the feature class           */
/*      definition.                                                     */
/************************************************************************/

bool OGRAVCE00Layer::CheckSetupTable(AVCE00Section *psTblSectionIn)
{
    if (psTableRead)
        return false;

    const char *pszTableType = nullptr;
    switch (eSectionType)
    {
        case AVCFileARC:
            pszTableType = ".AAT";
            break;

        case AVCFilePAL:
        case AVCFileLAB:
            pszTableType = ".PAT";
            break;

        default:
            break;
    }

    /* -------------------------------------------------------------------- */
    /*      Is the table type found anywhere in the section pszName?  Do    */
    /*      a case insensitive check.                                       */
    /* -------------------------------------------------------------------- */
    if (pszTableType == nullptr)
        return false;

    int iCheckOff = 0;
    for (; psTblSectionIn->pszName[iCheckOff] != '\0'; iCheckOff++)
    {
        if (EQUALN(psTblSectionIn->pszName + iCheckOff, pszTableType,
                   strlen(pszTableType)))
            break;
    }

    if (psTblSectionIn->pszName[iCheckOff] == '\0')
        return false;

    psTableSection = psTblSectionIn;

    /* -------------------------------------------------------------------- */
    /*      Try opening the table.                                          */
    /* -------------------------------------------------------------------- */
    psTableRead = AVCE00ReadOpenE00(psTblSectionIn->pszFilename);
    if (psTableRead == nullptr)
        return false;

    /* advance to the specified line number */
    if (AVCE00ReadGotoSectionE00(psTableRead, psTableSection, 0) != 0)
    {
        AVCE00ReadCloseE00(psTableRead);
        psTableRead = nullptr;
        return false;
    }

    AVCE00ReadNextObjectE00(psTableRead);
    bNeedReset = true;

    CPLFree(pszTableFilename);
    pszTableFilename = CPLStrdup(psTblSectionIn->pszFilename);
    nTableBaseField = poFeatureDefn->GetFieldCount();

    if (eSectionType == AVCFileLAB)
    {
        AVCE00ReadE00Ptr psInfo =
            static_cast<OGRAVCE00DataSource *>(poDS)->GetInfo();
        for (int iSection = 0; iSection < psInfo->numSections; iSection++)
        {
            if (psInfo->pasSections[iSection].eType == AVCFilePAL)
                nTableAttrIndex = poFeatureDefn->GetFieldIndex("PolyId");
        }
    }

    /* -------------------------------------------------------------------- */
    /*      Setup attributes.                                               */
    /* -------------------------------------------------------------------- */
    if (psTableRead->hParseInfo->hdr.psTableDef == nullptr)
    {
        AVCE00ReadCloseE00(psTableRead);
        psTableRead = nullptr;
        return false;
    }

    AppendTableDefinition(psTableRead->hParseInfo->hdr.psTableDef);

    /* -------------------------------------------------------------------- */
    /*      Close table so we don't have to many files open at once.        */
    /* -------------------------------------------------------------------- */
    /* AVCE00ReadCloseE00( psTableRead ); */

    return true;
}

/************************************************************************/
/*                         AppendTableFields()                          */
/************************************************************************/

bool OGRAVCE00Layer::AppendTableFields(OGRFeature *poFeature)

{
    if (psTableRead == nullptr)
        return false;
#ifdef deadcode
    /* -------------------------------------------------------------------- */
    /*      Open the table if it is currently closed.                       */
    /* -------------------------------------------------------------------- */
    if (psTableRead == nullptr)
    {
        psTableRead = AVCE00ReadOpenE00(pszTableFilename);
        if (psTableRead == nullptr)
            return false;

        /* Advance to the specified line number */
        if (AVCE00ReadGotoSectionE00(psTableRead, psTableSection, 0) != 0)
        {
            AVCE00ReadCloseE00(psTableRead);
            psTableRead = nullptr;
            return false;
        }
        nTablePos = 0;
    }
#endif
    /* -------------------------------------------------------------------- */
    /*      Read the info record.                                           */
    /*                                                                      */
    /*      We usually assume the FID of the feature is the key but in a    */
    /*      polygon coverage we need to use the PolyId attribute of LAB     */
    /*      features to lookup the related attributes.  In this case        */
    /*      nTableAttrIndex will already be setup to refer to the           */
    /*      PolyId field.                                                   */
    /* -------------------------------------------------------------------- */
    const int nRecordId = nTableAttrIndex == -1
                              ? static_cast<int>(poFeature->GetFID())
                              : poFeature->GetFieldAsInteger(nTableAttrIndex);

    if (nRecordId <= nTablePos)
    {
        if (AVCE00ReadGotoSectionE00(psTableRead, psTableSection, 0) != 0)
            return false;
        nTablePos = 0;
    }

    void *hRecord = nullptr;
    do
    {
        hRecord = AVCE00ReadNextObjectE00(psTableRead);
        ++nTablePos;
    } while (nullptr != hRecord && nTablePos < nRecordId);

    if (hRecord == nullptr)
        return false;
    if (psTableRead->hParseInfo->hdr.psTableDef == nullptr)
        return false;

    /* -------------------------------------------------------------------- */
    /*      Translate it.                                                   */
    /* -------------------------------------------------------------------- */
    return TranslateTableFields(poFeature, nTableBaseField,
                                psTableRead->hParseInfo->hdr.psTableDef,
                                static_cast<AVCField *>(hRecord));
}

GIntBig OGRAVCE00Layer::GetFeatureCount(int bForce)
{
    if (m_poAttrQuery != nullptr || m_poFilterGeom != nullptr)
        return OGRAVCLayer::GetFeatureCount(bForce);

    if (bForce && nFeatureCount < 0)
    {
        if (psSection->nFeatureCount < 0)
        {
            nFeatureCount = (int)OGRLayer::GetFeatureCount(bForce);
        }
        else
        {
            nFeatureCount = psSection->nFeatureCount;
            if (psSection->eType == AVCFilePAL)
                --nFeatureCount;
        }
    }
    return nFeatureCount;
}