/******************************************************************************
 *
 * Project:  OpenGIS Simple Features Reference Implementation
 * Purpose:  OGRSpatialReference translation from OziExplorer
 *           georeferencing information.
 * Author:   Andrey Kiselev, dron@ak4719.spb.edu
 *
 ******************************************************************************
 * Copyright (c) 2009, Andrey Kiselev <dron@ak4719.spb.edu>
 * Copyright (c) 2009-2012, Even Rouault <even dot rouault at spatialys.com>
 *
 * SPDX-License-Identifier: MIT
 ****************************************************************************/

#include "cpl_port.h"
#include "ogr_spatialref.h"

#include <cstdlib>
#include <cstring>

#include "cpl_conv.h"
#include "cpl_csv.h"
#include "cpl_error.h"
#include "cpl_string.h"
#include "ogr_core.h"
#include "ogr_srs_api.h"

/************************************************************************/
/*                          OSRImportFromOzi()                          */
/************************************************************************/

/**
 * Import coordinate system from OziExplorer projection definition.
 *
 * This function will import projection definition in style, used by
 * OziExplorer software.
 *
 * @param hSRS spatial reference object.
 * @param papszLines Map file lines. This is an array of strings containing
 * the whole OziExplorer .MAP file. The array is terminated by a NULL pointer.
 *
 * @return OGRERR_NONE on success or an error code in case of failure.
 */

OGRErr OSRImportFromOzi(OGRSpatialReferenceH hSRS,
                        const char *const *papszLines)

{
    VALIDATE_POINTER1(hSRS, "OSRImportFromOzi", OGRERR_FAILURE);

    return OGRSpatialReference::FromHandle(hSRS)->importFromOzi(papszLines);
}

/************************************************************************/
/*                            importFromOzi()                           */
/************************************************************************/

/**
 * Import coordinate system from OziExplorer projection definition.
 *
 * This method will import projection definition in style, used by
 * OziExplorer software.
 *
 * @param papszLines Map file lines. This is an array of strings containing
 * the whole OziExplorer .MAP file. The array is terminated by a NULL pointer.
 *
 * @return OGRERR_NONE on success or an error code in case of failure.
 *
 */

OGRErr OGRSpatialReference::importFromOzi(const char *const *papszLines)
{
    const char *pszDatum;
    const char *pszProj = nullptr;
    const char *pszProjParams = nullptr;

    Clear();

    const int nLines = CSLCount(papszLines);
    if (nLines < 5)
        return OGRERR_NOT_ENOUGH_DATA;

    pszDatum = papszLines[4];

    for (int iLine = 5; iLine < nLines; iLine++)
    {
        if (STARTS_WITH_CI(papszLines[iLine], "Map Projection"))
        {
            pszProj = papszLines[iLine];
        }
        else if (STARTS_WITH_CI(papszLines[iLine], "Projection Setup"))
        {
            pszProjParams = papszLines[iLine];
        }
    }

    if (!(pszDatum && pszProj && pszProjParams))
        return OGRERR_NOT_ENOUGH_DATA;

    /* -------------------------------------------------------------------- */
    /*      Operate on the basis of the projection name.                    */
    /* -------------------------------------------------------------------- */
    char **papszProj = CSLTokenizeStringComplex(pszProj, ",", TRUE, TRUE);
    char **papszProjParams =
        CSLTokenizeStringComplex(pszProjParams, ",", TRUE, TRUE);
    char **papszDatum = nullptr;

    if (CSLCount(papszProj) < 2)
    {
        goto not_enough_data;
    }

    if (STARTS_WITH_CI(papszProj[1], "Latitude/Longitude"))
    {
        // Do nothing.
    }
    else if (STARTS_WITH_CI(papszProj[1], "Mercator"))
    {
        if (CSLCount(papszProjParams) < 6)
            goto not_enough_data;
        double dfScale = CPLAtof(papszProjParams[3]);
        // If unset, default to scale = 1.
        if (papszProjParams[3][0] == 0)
            dfScale = 1;
        SetMercator(CPLAtof(papszProjParams[1]), CPLAtof(papszProjParams[2]),
                    dfScale, CPLAtof(papszProjParams[4]),
                    CPLAtof(papszProjParams[5]));
    }
    else if (STARTS_WITH_CI(papszProj[1], "Transverse Mercator"))
    {
        if (CSLCount(papszProjParams) < 6)
            goto not_enough_data;
        SetTM(CPLAtof(papszProjParams[1]), CPLAtof(papszProjParams[2]),
              CPLAtof(papszProjParams[3]), CPLAtof(papszProjParams[4]),
              CPLAtof(papszProjParams[5]));
    }
    else if (STARTS_WITH_CI(papszProj[1], "Lambert Conformal Conic"))
    {
        if (CSLCount(papszProjParams) < 8)
            goto not_enough_data;
        SetLCC(CPLAtof(papszProjParams[6]), CPLAtof(papszProjParams[7]),
               CPLAtof(papszProjParams[1]), CPLAtof(papszProjParams[2]),
               CPLAtof(papszProjParams[4]), CPLAtof(papszProjParams[5]));
    }
    else if (STARTS_WITH_CI(papszProj[1], "Sinusoidal"))
    {
        if (CSLCount(papszProjParams) < 6)
            goto not_enough_data;
        SetSinusoidal(CPLAtof(papszProjParams[2]), CPLAtof(papszProjParams[4]),
                      CPLAtof(papszProjParams[5]));
    }
    else if (STARTS_WITH_CI(papszProj[1], "Albers Equal Area"))
    {
        if (CSLCount(papszProjParams) < 8)
            goto not_enough_data;
        SetACEA(CPLAtof(papszProjParams[6]), CPLAtof(papszProjParams[7]),
                CPLAtof(papszProjParams[1]), CPLAtof(papszProjParams[2]),
                CPLAtof(papszProjParams[4]), CPLAtof(papszProjParams[5]));
    }
    else if (STARTS_WITH_CI(papszProj[1],
                            "(UTM) Universal Transverse Mercator") &&
             nLines > 5)
    {
        // Look for the UTM zone in the calibration point data.
        int iLine = 5;  // Used after for.
        for (; iLine < nLines; iLine++)
        {
            if (STARTS_WITH_CI(papszLines[iLine], "Point"))
            {
                char **papszTok = CSLTokenizeString2(papszLines[iLine], ",",
                                                     CSLT_ALLOWEMPTYTOKENS |
                                                         CSLT_STRIPLEADSPACES |
                                                         CSLT_STRIPENDSPACES);
                if (CSLCount(papszTok) < 17 || EQUAL(papszTok[2], "") ||
                    EQUAL(papszTok[13], "") || EQUAL(papszTok[14], "") ||
                    EQUAL(papszTok[15], "") || EQUAL(papszTok[16], ""))
                {
                    CSLDestroy(papszTok);
                    continue;
                }
                SetUTM(atoi(papszTok[13]), EQUAL(papszTok[16], "N"));
                CSLDestroy(papszTok);
                break;
            }
        }
        if (iLine == nLines)  // Try to guess the UTM zone.
        {
            float fMinLongitude = 1000.0f;
            float fMaxLongitude = -1000.0f;
            float fMinLatitude = 1000.0f;
            float fMaxLatitude = -1000.0f;
            bool bFoundMMPLL = false;
            for (iLine = 5; iLine < nLines; iLine++)
            {
                if (STARTS_WITH_CI(papszLines[iLine], "MMPLL"))
                {
                    char **papszTok = CSLTokenizeString2(
                        papszLines[iLine], ",",
                        CSLT_ALLOWEMPTYTOKENS | CSLT_STRIPLEADSPACES |
                            CSLT_STRIPENDSPACES);
                    if (CSLCount(papszTok) < 4)
                    {
                        CSLDestroy(papszTok);
                        continue;
                    }
                    const float fLongitude =
                        static_cast<float>(CPLAtofM(papszTok[2]));
                    const float fLatitude =
                        static_cast<float>(CPLAtofM(papszTok[3]));
                    CSLDestroy(papszTok);

                    bFoundMMPLL = true;

                    if (fMinLongitude > fLongitude)
                        fMinLongitude = fLongitude;
                    if (fMaxLongitude < fLongitude)
                        fMaxLongitude = fLongitude;
                    if (fMinLatitude > fLatitude)
                        fMinLatitude = fLatitude;
                    if (fMaxLatitude < fLatitude)
                        fMaxLatitude = fLatitude;
                }
            }
            const float fMedianLatitude = (fMinLatitude + fMaxLatitude) / 2;
            const float fMedianLongitude = (fMinLongitude + fMaxLongitude) / 2;
            if (bFoundMMPLL && fMaxLatitude <= 90)
            {
                int nUtmZone = 0;
                if (fMedianLatitude >= 56 && fMedianLatitude <= 64 &&
                    fMedianLongitude >= 3 && fMedianLongitude <= 12)
                    nUtmZone = 32;  // Norway exception.
                else if (fMedianLatitude >= 72 && fMedianLatitude <= 84 &&
                         fMedianLongitude >= 0 && fMedianLongitude <= 42)
                    // Svalbard exception.
                    nUtmZone =
                        static_cast<int>((fMedianLongitude + 3) / 12) * 2 + 31;
                else
                    nUtmZone =
                        static_cast<int>((fMedianLongitude + 180) / 6) + 1;
                SetUTM(nUtmZone, fMedianLatitude >= 0);
            }
            else
            {
                CPLDebug("OSR_Ozi", "UTM Zone not found");
            }
        }
    }
    else if (STARTS_WITH_CI(papszProj[1], "(I) France Zone I"))
    {
        SetLCC1SP(49.5, 2.337229167, 0.99987734, 600000, 1200000);
    }
    else if (STARTS_WITH_CI(papszProj[1], "(II) France Zone II"))
    {
        SetLCC1SP(46.8, 2.337229167, 0.99987742, 600000, 2200000);
    }
    else if (STARTS_WITH_CI(papszProj[1], "(III) France Zone III"))
    {
        SetLCC1SP(44.1, 2.337229167, 0.99987750, 600000, 3200000);
    }
    else if (STARTS_WITH_CI(papszProj[1], "(IV) France Zone IV"))
    {
        SetLCC1SP(42.165, 2.337229167, 0.99994471, 234.358, 4185861.369);
    }

    /*
     *  Note: The following projections have not been implemented yet
     *
     */

    /*
        else if( STARTS_WITH_CI(papszProj[1], "(BNG) British National Grid") )
        {
        }
        else if( STARTS_WITH_CI(papszProj[1], "(IG) Irish Grid") )
        {
        }

        else if( STARTS_WITH_CI(papszProj[1], "(NZG) New Zealand Grid") )
        {
        }
        else if( STARTS_WITH_CI(papszProj[1], "(NZTM2) New Zealand TM 2000") )
        {
        }
        else if( STARTS_WITH_CI(papszProj[1], "(SG) Swedish Grid") )
        {
        }
        else if( STARTS_WITH_CI(papszProj[1], "(SUI) Swiss Grid") )
        {
        }
        else if( STARTS_WITH_CI(papszProj[1], "(A)Lambert Azimuthual Equal
       Area") )
        {
        }
        else if( STARTS_WITH_CI(papszProj[1], "(EQC) Equidistant Conic") )
        {
        }
        else if( STARTS_WITH_CI(papszProj[1], "Polyconic (American)") )
        {
        }
        else if( STARTS_WITH_CI(papszProj[1], "Van Der Grinten") )
        {
        }
        else if( STARTS_WITH_CI(papszProj[1], "Vertical Near-Sided Perspective")
       )
        {
        }
        else if( STARTS_WITH_CI(papszProj[1], "(WIV) Wagner IV") )
        {
        }
        else if( STARTS_WITH_CI(papszProj[1], "Bonne") )
        {
        }
        else if( STARTS_WITH_CI(papszProj[1],
                                "(MT0) Montana State Plane Zone 2500") )
        {
        }
        else if( STARTS_WITH_CI(papszProj[1], "ITA1) Italy Grid Zone 1") )
        {
        }
        else if( STARTS_WITH_CI(papszProj[1], "ITA2) Italy Grid Zone 2") )
        {
        }
        else if( STARTS_WITH_CI(papszProj[1],
                                "(VICMAP-TM) Victoria Aust.(pseudo AMG)") )
        {
        }
        else if( STARTS_WITH_CI(papszProj[1], "VICGRID) Victoria Australia") )
        {
        }
        else if( STARTS_WITH_CI(papszProj[1],
                                "(VG94) VICGRID94 Victoria Australia") )
        {
        }
        else if( STARTS_WITH_CI(papszProj[1], "Gnomonic") )
        {
        }
    */
    else
    {
        CPLDebug("OSR_Ozi", "Unsupported projection: \"%s\"", papszProj[1]);
        SetLocalCS(
            CPLString().Printf(R"("Ozi" projection "%s")", papszProj[1]));
    }

    /* -------------------------------------------------------------------- */
    /*      Try to translate the datum/spheroid.                            */
    /* -------------------------------------------------------------------- */
    papszDatum = CSLTokenizeString2(
        pszDatum, ",",
        CSLT_ALLOWEMPTYTOKENS | CSLT_STRIPLEADSPACES | CSLT_STRIPENDSPACES);
    if (papszDatum == nullptr)
        goto not_enough_data;

    if (!IsLocal())
    {
        /* --------------------------------------------------------------------
         */
        /*      Verify that we can find the CSV file containing the datums */
        /* --------------------------------------------------------------------
         */
        if (CSVScanFileByName(CSVFilename("ozi_datum.csv"), "EPSG_DATUM_CODE",
                              "4326", CC_Integer) == nullptr)
        {
            CPLError(CE_Failure, CPLE_OpenFailed,
                     "Unable to open OZI support file %s.  "
                     "Try setting the GDAL_DATA environment variable to point "
                     "to the directory containing OZI csv files.",
                     CSVFilename("ozi_datum.csv"));
            goto other_error;
        }

        /* --------------------------------------------------------------------
         */
        /*      Search for matching datum */
        /* --------------------------------------------------------------------
         */
        const char *pszOziDatum = CSVFilename("ozi_datum.csv");
        CPLString osDName = CSVGetField(pszOziDatum, "NAME", papszDatum[0],
                                        CC_ApproxString, "NAME");
        if (osDName.empty())
        {
            CPLError(CE_Failure, CPLE_AppDefined,
                     "Failed to find datum %s in ozi_datum.csv.",
                     papszDatum[0]);
            goto other_error;
        }

        const int nDatumCode =
            atoi(CSVGetField(pszOziDatum, "NAME", papszDatum[0],
                             CC_ApproxString, "EPSG_DATUM_CODE"));

        if (nDatumCode > 0)  // There is a matching EPSG code
        {
            OGRSpatialReference oGCS;
            oGCS.importFromEPSG(nDatumCode);
            CopyGeogCSFrom(&oGCS);
        }
        else  // We use the parameters from the CSV files
        {
            CPLString osEllipseCode =
                CSVGetField(pszOziDatum, "NAME", papszDatum[0], CC_ApproxString,
                            "ELLIPSOID_CODE");
            const double dfDeltaX = CPLAtof(CSVGetField(
                pszOziDatum, "NAME", papszDatum[0], CC_ApproxString, "DELTAX"));
            const double dfDeltaY = CPLAtof(CSVGetField(
                pszOziDatum, "NAME", papszDatum[0], CC_ApproxString, "DELTAY"));
            const double dfDeltaZ = CPLAtof(CSVGetField(
                pszOziDatum, "NAME", papszDatum[0], CC_ApproxString, "DELTAZ"));

            /* --------------------------------------------------------------------
             */
            /*     Verify that we can find the CSV file containing the
             * ellipsoids.  */
            /* --------------------------------------------------------------------
             */
            if (CSVScanFileByName(CSVFilename("ozi_ellips.csv"),
                                  "ELLIPSOID_CODE", "20",
                                  CC_Integer) == nullptr)
            {
                CPLError(
                    CE_Failure, CPLE_OpenFailed,
                    "Unable to open OZI support file %s.  "
                    "Try setting the GDAL_DATA environment variable to point "
                    "to the directory containing OZI csv files.",
                    CSVFilename("ozi_ellips.csv"));
                goto other_error;
            }

            /* --------------------------------------------------------------------
             */
            /*      Lookup the ellipse code. */
            /* --------------------------------------------------------------------
             */
            const char *pszOziEllipse = CSVFilename("ozi_ellips.csv");

            CPLString osEName =
                CSVGetField(pszOziEllipse, "ELLIPSOID_CODE", osEllipseCode,
                            CC_ApproxString, "NAME");
            if (osEName.empty())
            {
                CPLError(CE_Failure, CPLE_AppDefined,
                         "Failed to find ellipsoid %s in ozi_ellips.csv.",
                         osEllipseCode.c_str());
                goto other_error;
            }

            const double dfA =
                CPLAtof(CSVGetField(pszOziEllipse, "ELLIPSOID_CODE",
                                    osEllipseCode, CC_ApproxString, "A"));
            const double dfInvF =
                CPLAtof(CSVGetField(pszOziEllipse, "ELLIPSOID_CODE",
                                    osEllipseCode, CC_ApproxString, "INVF"));

            /* --------------------------------------------------------------------
             */
            /*      Create geographic coordinate system. */
            /* --------------------------------------------------------------------
             */
            SetGeogCS(osDName, osDName, osEName, dfA, dfInvF);
            SetTOWGS84(dfDeltaX, dfDeltaY, dfDeltaZ);
        }
    }

    /* -------------------------------------------------------------------- */
    /*      Grid units translation                                          */
    /* -------------------------------------------------------------------- */
    if (IsLocal() || IsProjected())
        SetLinearUnits(SRS_UL_METER, 1.0);

    CSLDestroy(papszProj);
    CSLDestroy(papszProjParams);
    CSLDestroy(papszDatum);

    return OGRERR_NONE;

not_enough_data:

    CSLDestroy(papszProj);
    CSLDestroy(papszProjParams);
    CSLDestroy(papszDatum);

    return OGRERR_NOT_ENOUGH_DATA;

other_error:

    CSLDestroy(papszProj);
    CSLDestroy(papszProjParams);
    CSLDestroy(papszDatum);

    return OGRERR_FAILURE;
}