/******************************************************************************
 *
 * Project:  Idrisi Translator
 * Purpose:  Implements OGRIdrisiLayer class.
 * Author:   Even Rouault, <even dot rouault at spatialys.com>
 *
 ******************************************************************************
 * Copyright (c) 2011-2013, Even Rouault <even dot rouault at spatialys.com>
 *
 * SPDX-License-Identifier: MIT
 ****************************************************************************/

#include "cpl_conv.h"
#include "cpl_string.h"
#include "ogr_idrisi.h"
#include "ogr_p.h"
#include "ogr_srs_api.h"

/************************************************************************/
/*                         OGRIdrisiLayer()                             */
/************************************************************************/

OGRIdrisiLayer::OGRIdrisiLayer(const char *pszFilename,
                               const char *pszLayerName, VSILFILE *fpIn,
                               OGRwkbGeometryType eGeomTypeIn,
                               const char *pszWTKString)
    : poFeatureDefn(new OGRFeatureDefn(pszLayerName)), poSRS(nullptr),
      eGeomType(eGeomTypeIn), fp(fpIn), fpAVL(nullptr), bEOF(false),
      nNextFID(1), bExtentValid(false), dfMinX(0.0), dfMinY(0.0), dfMaxX(0.0),
      dfMaxY(0.0), nTotalFeatures(0)
{
    if (pszWTKString)
    {
        poSRS = new OGRSpatialReference();
        poSRS->SetAxisMappingStrategy(OAMS_TRADITIONAL_GIS_ORDER);
        poSRS->importFromWkt(pszWTKString);
    }

    SetDescription(poFeatureDefn->GetName());
    poFeatureDefn->Reference();
    poFeatureDefn->GetGeomFieldDefn(0)->SetSpatialRef(poSRS);
    poFeatureDefn->SetGeomType(eGeomType);

    OGRFieldDefn oFieldDefn("id", OFTReal);
    poFeatureDefn->AddFieldDefn(&oFieldDefn);

    VSIFSeekL(fp, 1, SEEK_SET);
    if (VSIFReadL(&nTotalFeatures, sizeof(unsigned int), 1, fp) != 1)
        nTotalFeatures = 0;
    CPL_LSBPTR32(&nTotalFeatures);

    if (nTotalFeatures != 0)
    {
        if (!Detect_AVL_ADC(pszFilename))
        {
            if (fpAVL != nullptr)
                VSIFCloseL(fpAVL);
            fpAVL = nullptr;
        }
    }

    OGRIdrisiLayer::ResetReading();
}

/************************************************************************/
/*                          ~OGRIdrisiLayer()                           */
/************************************************************************/

OGRIdrisiLayer::~OGRIdrisiLayer()

{
    if (poSRS != nullptr)
        poSRS->Release();

    poFeatureDefn->Release();

    VSIFCloseL(fp);

    if (fpAVL != nullptr)
        VSIFCloseL(fpAVL);
}

/************************************************************************/
/*                           Detect_AVL_ADC()                           */
/************************************************************************/

bool OGRIdrisiLayer::Detect_AVL_ADC(const char *pszFilename)
{
    // --------------------------------------------------------------------
    //      Look for .adc file
    // --------------------------------------------------------------------
    std::string osADCFilename = CPLResetExtensionSafe(pszFilename, "adc");
    VSILFILE *fpADC = VSIFOpenL(osADCFilename.c_str(), "rb");
    if (fpADC == nullptr)
    {
        osADCFilename = CPLResetExtensionSafe(pszFilename, "ADC");
        fpADC = VSIFOpenL(osADCFilename.c_str(), "rb");
    }

    char **papszADC = nullptr;
    if (fpADC != nullptr)
    {
        VSIFCloseL(fpADC);
        fpADC = nullptr;

        CPLPushErrorHandler(CPLQuietErrorHandler);
        papszADC = CSLLoad2(osADCFilename.c_str(), 1024, 256, nullptr);
        CPLPopErrorHandler();
        CPLErrorReset();
    }

    if (papszADC == nullptr)
        return false;

    CSLSetNameValueSeparator(papszADC, ":");

    const char *pszVersion = CSLFetchNameValue(papszADC, "file format");
    if (pszVersion == nullptr || !EQUAL(pszVersion, "IDRISI Values A.1"))
    {
        CSLDestroy(papszADC);
        return false;
    }

    const char *pszFileType = CSLFetchNameValue(papszADC, "file type");
    if (pszFileType == nullptr || !EQUAL(pszFileType, "ascii"))
    {
        CPLDebug("IDRISI", ".adc file found, but file type != ascii");
        CSLDestroy(papszADC);
        return false;
    }

    const char *pszRecords = CSLFetchNameValue(papszADC, "records");
    if (pszRecords == nullptr || atoi(pszRecords) != (int)nTotalFeatures)
    {
        CPLDebug("IDRISI", ".adc file found, but 'records' not found or not "
                           "consistent with feature number declared in .vdc");
        CSLDestroy(papszADC);
        return false;
    }

    const char *pszFields = CSLFetchNameValue(papszADC, "fields");
    if (pszFields == nullptr || atoi(pszFields) <= 1)
    {
        CPLDebug("IDRISI",
                 ".adc file found, but 'fields' not found or invalid");
        CSLDestroy(papszADC);
        return false;
    }

    // --------------------------------------------------------------------
    //      Look for .avl file
    // --------------------------------------------------------------------
    std::string osAVLFilename = CPLResetExtensionSafe(pszFilename, "avl");
    fpAVL = VSIFOpenL(osAVLFilename.c_str(), "rb");
    if (fpAVL == nullptr)
    {
        osAVLFilename = CPLResetExtensionSafe(pszFilename, "AVL");
        fpAVL = VSIFOpenL(osAVLFilename.c_str(), "rb");
    }
    if (fpAVL == nullptr)
    {
        CSLDestroy(papszADC);
        return false;
    }

    // --------------------------------------------------------------------
    //      Build layer definition
    // --------------------------------------------------------------------

    char szKey[32];
    int iCurField = 0;
    snprintf(szKey, sizeof(szKey), "field %d", iCurField);

    char **papszIter = papszADC;
    const char *pszLine = nullptr;
    bool bFieldFound = false;
    CPLString osFieldName;
    while ((pszLine = *papszIter) != nullptr)
    {
        // CPLDebug("IDRISI", "%s", pszLine);
        if (strncmp(pszLine, szKey, strlen(szKey)) == 0)
        {
            const char *pszColon = strchr(pszLine, ':');
            if (pszColon)
            {
                osFieldName = pszColon + 1;
                bFieldFound = true;
            }
        }
        else if (bFieldFound && STARTS_WITH(pszLine, "data type:"))
        {
            const char *pszFieldType = pszLine + strlen("data type:");

            OGRFieldDefn oFieldDefn(osFieldName.c_str(),
                                    EQUAL(pszFieldType, "integer") ? OFTInteger
                                    : EQUAL(pszFieldType, "real")  ? OFTReal
                                                                   : OFTString);

            if (iCurField == 0 && oFieldDefn.GetType() != OFTInteger)
            {
                CSLDestroy(papszADC);
                return false;
            }

            if (iCurField != 0)
                poFeatureDefn->AddFieldDefn(&oFieldDefn);

            iCurField++;
            snprintf(szKey, sizeof(szKey), "field %d", iCurField);
        }

        papszIter++;
    }

    CSLDestroy(papszADC);

    return true;
}

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

void OGRIdrisiLayer::ResetReading()

{
    nNextFID = 1;
    bEOF = false;
    VSIFSeekL(fp, 0x105, SEEK_SET);
    if (fpAVL != nullptr)
        VSIFSeekL(fpAVL, 0, SEEK_SET);
}

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

int OGRIdrisiLayer::TestCapability(const char *pszCap) const

{
    if (EQUAL(pszCap, OLCFastFeatureCount))
        return m_poFilterGeom == nullptr && m_poAttrQuery == nullptr;

    if (EQUAL(pszCap, OLCFastGetExtent))
        return bExtentValid;

    return FALSE;
}

/************************************************************************/
/*                         GetNextRawFeature()                          */
/************************************************************************/

OGRFeature *OGRIdrisiLayer::GetNextRawFeature()
{
    if (bEOF)
        return nullptr;

    while (true)
    {
        if (eGeomType == wkbPoint)
        {
            double dfId = 0.0;
            double dfX = 0.0;
            double dfY = 0.0;
            if (VSIFReadL(&dfId, sizeof(double), 1, fp) != 1 ||
                VSIFReadL(&dfX, sizeof(double), 1, fp) != 1 ||
                VSIFReadL(&dfY, sizeof(double), 1, fp) != 1)
            {
                return nullptr;
            }
            CPL_LSBPTR64(&dfId);
            CPL_LSBPTR64(&dfX);
            CPL_LSBPTR64(&dfY);

            if (m_poFilterGeom != nullptr &&
                (dfX < m_sFilterEnvelope.MinX || dfX > m_sFilterEnvelope.MaxX ||
                 dfY < m_sFilterEnvelope.MinY || dfY > m_sFilterEnvelope.MaxY))
            {
                nNextFID++;
                continue;
            }

            OGRPoint *poGeom = new OGRPoint(dfX, dfY);
            if (poSRS)
                poGeom->assignSpatialReference(poSRS);
            OGRFeature *poFeature = new OGRFeature(poFeatureDefn);
            poFeature->SetField(0, dfId);
            poFeature->SetFID(nNextFID++);
            poFeature->SetGeometryDirectly(poGeom);
            ReadAVLLine(poFeature);
            return poFeature;
        }
        else if (eGeomType == wkbLineString)
        {
            double dfId = 0.0;
            double dfMinXShape = 0.0;
            double dfMaxXShape = 0.0;
            double dfMinYShape = 0.0;
            double dfMaxYShape = 0.0;

            if (VSIFReadL(&dfId, sizeof(double), 1, fp) != 1 ||
                VSIFReadL(&dfMinXShape, sizeof(double), 1, fp) != 1 ||
                VSIFReadL(&dfMaxXShape, sizeof(double), 1, fp) != 1 ||
                VSIFReadL(&dfMinYShape, sizeof(double), 1, fp) != 1 ||
                VSIFReadL(&dfMaxYShape, sizeof(double), 1, fp) != 1)
            {
                bEOF = true;
                return nullptr;
            }
            CPL_LSBPTR64(&dfId);
            CPL_LSBPTR64(&dfMinXShape);
            CPL_LSBPTR64(&dfMaxXShape);
            CPL_LSBPTR64(&dfMinYShape);
            CPL_LSBPTR64(&dfMaxYShape);

            unsigned int nNodes = 0;
            if (VSIFReadL(&nNodes, sizeof(unsigned int), 1, fp) != 1)
            {
                bEOF = true;
                return nullptr;
            }
            CPL_LSBPTR32(&nNodes);

            if (nNodes > 100 * 1000 * 1000)
            {
                bEOF = true;
                return nullptr;
            }

            if (m_poFilterGeom != nullptr &&
                (dfMaxXShape < m_sFilterEnvelope.MinX ||
                 dfMinXShape > m_sFilterEnvelope.MaxX ||
                 dfMaxYShape < m_sFilterEnvelope.MinY ||
                 dfMinYShape > m_sFilterEnvelope.MaxY))
            {
                nNextFID++;
                VSIFSeekL(fp, sizeof(OGRRawPoint) * nNodes, SEEK_CUR);
                continue;
            }

            OGRRawPoint *poRawPoints = static_cast<OGRRawPoint *>(
                VSI_MALLOC2_VERBOSE(sizeof(OGRRawPoint), nNodes));
            if (poRawPoints == nullptr)
            {
                bEOF = true;
                return nullptr;
            }

            if (static_cast<unsigned int>(VSIFReadL(
                    poRawPoints, sizeof(OGRRawPoint), nNodes, fp)) != nNodes)
            {
                VSIFree(poRawPoints);
                bEOF = true;
                return nullptr;
            }

#if defined(CPL_MSB)
            for (unsigned int iNode = 0; iNode < nNodes; iNode++)
            {
                CPL_LSBPTR64(&poRawPoints[iNode].x);
                CPL_LSBPTR64(&poRawPoints[iNode].y);
            }
#endif

            OGRLineString *poGeom = new OGRLineString();
            poGeom->setPoints(nNodes, poRawPoints, nullptr);

            VSIFree(poRawPoints);

            if (poSRS)
                poGeom->assignSpatialReference(poSRS);
            OGRFeature *poFeature = new OGRFeature(poFeatureDefn);
            poFeature->SetField(0, dfId);
            poFeature->SetFID(nNextFID++);
            poFeature->SetGeometryDirectly(poGeom);
            ReadAVLLine(poFeature);
            return poFeature;
        }
        else  // if (eGeomType == wkbPolygon)
        {
            double dfId = 0.0;
            double dfMinXShape = 0.0;
            double dfMaxXShape = 0.0;
            double dfMinYShape = 0.0;
            double dfMaxYShape = 0.0;

            if (VSIFReadL(&dfId, sizeof(double), 1, fp) != 1 ||
                VSIFReadL(&dfMinXShape, sizeof(double), 1, fp) != 1 ||
                VSIFReadL(&dfMaxXShape, sizeof(double), 1, fp) != 1 ||
                VSIFReadL(&dfMinYShape, sizeof(double), 1, fp) != 1 ||
                VSIFReadL(&dfMaxYShape, sizeof(double), 1, fp) != 1)
            {
                bEOF = true;
                return nullptr;
            }
            CPL_LSBPTR64(&dfId);
            CPL_LSBPTR64(&dfMinXShape);
            CPL_LSBPTR64(&dfMaxXShape);
            CPL_LSBPTR64(&dfMinYShape);
            CPL_LSBPTR64(&dfMaxYShape);
            unsigned int nParts = 0;
            unsigned int nTotalNodes = 0;
            if (VSIFReadL(&nParts, sizeof(unsigned int), 1, fp) != 1 ||
                VSIFReadL(&nTotalNodes, sizeof(unsigned int), 1, fp) != 1)
            {
                bEOF = true;
                return nullptr;
            }
            CPL_LSBPTR32(&nParts);
            CPL_LSBPTR32(&nTotalNodes);

            if (nParts > 100000 || nTotalNodes > 100 * 1000 * 1000)
            {
                bEOF = true;
                return nullptr;
            }

            if (m_poFilterGeom != nullptr &&
                (dfMaxXShape < m_sFilterEnvelope.MinX ||
                 dfMinXShape > m_sFilterEnvelope.MaxX ||
                 dfMaxYShape < m_sFilterEnvelope.MinY ||
                 dfMinYShape > m_sFilterEnvelope.MaxY))
            {
                VSIFSeekL(fp,
                          sizeof(unsigned int) * nParts +
                              sizeof(OGRRawPoint) * nTotalNodes,
                          SEEK_CUR);
                nNextFID++;
                continue;
            }

            OGRRawPoint *poRawPoints = static_cast<OGRRawPoint *>(
                VSI_MALLOC2_VERBOSE(sizeof(OGRRawPoint), nTotalNodes));
            if (poRawPoints == nullptr)
            {
                bEOF = true;
                return nullptr;
            }
            unsigned int *panNodesCount = nullptr;
            if (nParts > 1)
            {
                panNodesCount = static_cast<unsigned int *>(
                    CPLMalloc(sizeof(unsigned int) * nParts));
                if (VSIFReadL(panNodesCount, sizeof(unsigned int) * nParts, 1,
                              fp) != 1)
                {
                    VSIFree(poRawPoints);
                    VSIFree(panNodesCount);
                    bEOF = true;
                    return nullptr;
                }
#if defined(CPL_MSB)
                for (unsigned int iPart = 0; iPart < nParts; iPart++)
                {
                    CPL_LSBPTR32(&panNodesCount[iPart]);
                }
#endif
            }
            else
            {
                unsigned int nNodes = 0;
                if (VSIFReadL(&nNodes, sizeof(unsigned int) * nParts, 1, fp) !=
                    1)
                {
                    VSIFree(poRawPoints);
                    bEOF = true;
                    return nullptr;
                }
                CPL_LSBPTR32(&nNodes);
                if (nNodes != nTotalNodes)
                {
                    VSIFree(poRawPoints);
                    bEOF = true;
                    return nullptr;
                }
            }

            OGRPolygon *poGeom = new OGRPolygon();
            for (unsigned int iPart = 0; iPart < nParts; iPart++)
            {
                unsigned int nNodes =
                    (nParts > 1) ? panNodesCount[iPart] : nTotalNodes;
                if (nNodes > nTotalNodes ||
                    static_cast<unsigned int>(VSIFReadL(poRawPoints,
                                                        sizeof(OGRRawPoint),
                                                        nNodes, fp)) != nNodes)
                {
                    VSIFree(poRawPoints);
                    VSIFree(panNodesCount);
                    delete poGeom;
                    bEOF = true;
                    return nullptr;
                }

#if defined(CPL_MSB)
                for (unsigned int iNode = 0; iNode < nNodes; iNode++)
                {
                    CPL_LSBPTR64(&poRawPoints[iNode].x);
                    CPL_LSBPTR64(&poRawPoints[iNode].y);
                }
#endif

                OGRLinearRing *poLR = new OGRLinearRing();
                poGeom->addRingDirectly(poLR);
                poLR->setPoints(nNodes, poRawPoints, nullptr);
            }

            VSIFree(poRawPoints);
            VSIFree(panNodesCount);

            if (poSRS)
                poGeom->assignSpatialReference(poSRS);
            OGRFeature *poFeature = new OGRFeature(poFeatureDefn);
            poFeature->SetField(0, dfId);
            poFeature->SetFID(nNextFID++);
            poFeature->SetGeometryDirectly(poGeom);
            ReadAVLLine(poFeature);
            return poFeature;
        }
    }
}

/************************************************************************/
/*                            ReadAVLLine()                             */
/************************************************************************/

void OGRIdrisiLayer::ReadAVLLine(OGRFeature *poFeature)
{
    if (fpAVL == nullptr)
        return;

    const char *pszLine = CPLReadLineL(fpAVL);
    if (pszLine == nullptr)
        return;

    char **papszTokens = CSLTokenizeStringComplex(pszLine, "\t", TRUE, TRUE);
    if (CSLCount(papszTokens) == poFeatureDefn->GetFieldCount())
    {
        const int nID = atoi(papszTokens[0]);
        if (nID == poFeature->GetFID())
        {
            for (int i = 1; i < poFeatureDefn->GetFieldCount(); i++)
            {
                poFeature->SetField(i, papszTokens[i]);
            }
        }
    }
    CSLDestroy(papszTokens);
}

/************************************************************************/
/*                             SetExtent()                              */
/************************************************************************/

void OGRIdrisiLayer::SetExtent(double dfMinXIn, double dfMinYIn,
                               double dfMaxXIn, double dfMaxYIn)
{
    bExtentValid = true;
    dfMinX = dfMinXIn;
    dfMinY = dfMinYIn;
    dfMaxX = dfMaxXIn;
    dfMaxY = dfMaxYIn;
}

/************************************************************************/
/*                            IGetExtent()                              */
/************************************************************************/

OGRErr OGRIdrisiLayer::IGetExtent(int iGeomField, OGREnvelope *psExtent,
                                  bool bForce)
{
    if (!bExtentValid)
        return OGRLayer::IGetExtent(iGeomField, psExtent, bForce);

    psExtent->MinX = dfMinX;
    psExtent->MinY = dfMinY;
    psExtent->MaxX = dfMaxX;
    psExtent->MaxY = dfMaxY;
    return OGRERR_NONE;
}

/************************************************************************/
/*                          GetFeatureCount()                           */
/************************************************************************/

GIntBig OGRIdrisiLayer::GetFeatureCount(int bForce)
{
    if (nTotalFeatures > 0 && m_poFilterGeom == nullptr &&
        m_poAttrQuery == nullptr)
        return nTotalFeatures;

    return OGRLayer::GetFeatureCount(bForce);
}
