#!/usr/bin/env python
# -*- coding: utf-8 -*-
#*****************************************************************************
# $Id$
#
# Project:  OpenGIS Simple Features Reference Implementation
# Purpose:  Python port of a simple client for translating between formats.
# Author:   Even Rouault, <even dot rouault at mines dash paris dot org>
#
# Port from ogr2ogr.cpp whose author is Frank Warmerdam
#
#*****************************************************************************
# Copyright (c) 2010-2013, Even Rouault <even dot rouault at mines-paris dot org>
# Copyright (c) 1999, Frank Warmerdam
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
#**************************************************************************

# Note : this is the most direct port of ogr2ogr.cpp possible
# It could be made much more Python'ish !

import sys
import os
import stat

from osgeo import gdal
from osgeo import ogr
from osgeo import osr

###############################################################################

class ScaledProgressObject:
    def __init__(self, min, max, cbk, cbk_data = None):
        self.min = min
        self.max = max
        self.cbk = cbk
        self.cbk_data = cbk_data

###############################################################################

def ScaledProgressFunc(pct, msg, data):
    if data.cbk is None:
        return True
    return data.cbk(data.min + pct * (data.max - data.min), msg, data.cbk_data)

###############################################################################

def EQUAL(a, b):
    return a.lower() == b.lower()

###############################################################################
# Redefinition of GDALTermProgress, so that autotest/pyscripts/test_ogr2ogr_py.py
# can check that the progress bar is displayed

nLastTick = -1

def TermProgress( dfComplete, pszMessage, pProgressArg ):

    global nLastTick
    nThisTick = (int) (dfComplete * 40.0)

    if nThisTick < 0:
        nThisTick = 0
    if nThisTick > 40:
        nThisTick = 40

    # Have we started a new progress run?
    if nThisTick < nLastTick and nLastTick >= 39:
        nLastTick = -1

    if nThisTick <= nLastTick:
        return True

    while nThisTick > nLastTick:
        nLastTick = nLastTick + 1
        if (nLastTick % 4) == 0:
            sys.stdout.write('%d' % ((nLastTick / 4) * 10))
        else:
            sys.stdout.write('.')

    if nThisTick == 40:
        print(" - done." )
    else:
        sys.stdout.flush()

    return True

class TargetLayerInfo:
    def __init__(self):
        self.poDstLayer = None
        self.poCT = None
        #self.papszTransformOptions = None
        self.panMap = None
        self.iSrcZField = None

class AssociatedLayers:
    def __init__(self):
        self.poSrcLayer = None
        self.psInfo = None

#**********************************************************************
#                                main()
#**********************************************************************

bSkipFailures = False
nGroupTransactions = 200
bPreserveFID = False
nFIDToFetch = ogr.NullFID

class Enum(set):
    def __getattr__(self, name):
        if name in self:
            return name
        raise AttributeError

GeomOperation = Enum(["NONE", "SEGMENTIZE", "SIMPLIFY_PRESERVE_TOPOLOGY"])

def main(args = None, progress_func = TermProgress, progress_data = None):

    global bSkipFailures
    global nGroupTransactions
    global bPreserveFID
    global nFIDToFetch

    pszFormat = "ESRI Shapefile"
    pszDataSource = None
    pszDestDataSource = None
    papszLayers = []
    papszDSCO = []
    papszLCO = []
    bTransform = False
    bAppend = False
    bUpdate = False
    bOverwrite = False
    pszOutputSRSDef = None
    pszSourceSRSDef = None
    poOutputSRS = None
    bNullifyOutputSRS = False
    poSourceSRS = None
    pszNewLayerName = None
    pszWHERE = None
    poSpatialFilter = None
    pszSelect = None
    papszSelFields = None
    pszSQLStatement = None
    eGType = -2
    bPromoteToMulti = False
    eGeomOp = GeomOperation.NONE
    dfGeomOpParam = 0
    papszFieldTypesToString = []
    bDisplayProgress = False
    pfnProgress = None
    pProgressArg = None
    bClipSrc = False
    bWrapDateline = False
    poClipSrc = None
    pszClipSrcDS = None
    pszClipSrcSQL = None
    pszClipSrcLayer = None
    pszClipSrcWhere = None
    poClipDst = None
    pszClipDstDS = None
    pszClipDstSQL = None
    pszClipDstLayer = None
    pszClipDstWhere = None
    #pszSrcEncoding = None
    #pszDstEncoding = None
    bWrapDateline = False
    bExplodeCollections = False
    pszZField = None
    nCoordDim = -1

    if args is None:
        args = sys.argv

    args = ogr.GeneralCmdLineProcessor( args )

# --------------------------------------------------------------------
#      Processing command line arguments.
# --------------------------------------------------------------------
    if args is None:
        return False

    nArgc = len(args)

    iArg = 1
    while iArg < nArgc:
        if EQUAL(args[iArg],"-f") and iArg < nArgc-1:
            iArg = iArg + 1
            pszFormat = args[iArg]

        elif EQUAL(args[iArg],"-dsco") and iArg < nArgc-1:
            iArg = iArg + 1
            papszDSCO.append(args[iArg] )

        elif EQUAL(args[iArg],"-lco") and iArg < nArgc-1:
            iArg = iArg + 1
            papszLCO.append(args[iArg] )

        elif EQUAL(args[iArg],"-preserve_fid"):
            bPreserveFID = True

        elif len(args[iArg]) >= 5 and EQUAL(args[iArg][0:5], "-skip"):
            bSkipFailures = True
            nGroupTransactions = 1 # #2409

        elif EQUAL(args[iArg],"-append"):
            bAppend = True
            bUpdate = True

        elif EQUAL(args[iArg],"-overwrite"):
            bOverwrite = True
            bUpdate = True

        elif EQUAL(args[iArg],"-update"):
            bUpdate = True

        elif EQUAL(args[iArg],"-fid") and iArg < nArgc-1:
            iArg = iArg + 1
            nFIDToFetch = int(args[iArg])

        elif EQUAL(args[iArg],"-sql") and iArg < nArgc-1:
            iArg = iArg + 1
            pszSQLStatement = args[iArg]

        elif EQUAL(args[iArg],"-nln") and iArg < nArgc-1:
            iArg = iArg + 1
            pszNewLayerName = args[iArg]

        elif EQUAL(args[iArg],"-nlt") and iArg < nArgc-1:

            if EQUAL(args[iArg+1],"NONE"):
                eGType = ogr.wkbNone
            elif EQUAL(args[iArg+1],"GEOMETRY"):
                eGType = ogr.wkbUnknown
            elif EQUAL(args[iArg+1],"PROMOTE_TO_MULTI"):
                bPromoteToMulti = True
            elif EQUAL(args[iArg+1],"POINT"):
                eGType = ogr.wkbPoint
            elif EQUAL(args[iArg+1],"LINESTRING"):
                eGType = ogr.wkbLineString
            elif EQUAL(args[iArg+1],"POLYGON"):
                eGType = ogr.wkbPolygon
            elif EQUAL(args[iArg+1],"GEOMETRYCOLLECTION"):
                eGType = ogr.wkbGeometryCollection
            elif EQUAL(args[iArg+1],"MULTIPOINT"):
                eGType = ogr.wkbMultiPoint
            elif EQUAL(args[iArg+1],"MULTILINESTRING"):
                eGType = ogr.wkbMultiLineString
            elif EQUAL(args[iArg+1],"MULTIPOLYGON"):
                eGType = ogr.wkbMultiPolygon
            elif EQUAL(args[iArg+1],"GEOMETRY25D"):
                eGType = ogr.wkbUnknown | ogr.wkb25DBit
            elif EQUAL(args[iArg+1],"POINT25D"):
                eGType = ogr.wkbPoint25D
            elif EQUAL(args[iArg+1],"LINESTRING25D"):
                eGType = ogr.wkbLineString25D
            elif EQUAL(args[iArg+1],"POLYGON25D"):
                eGType = ogr.wkbPolygon25D
            elif EQUAL(args[iArg+1],"GEOMETRYCOLLECTION25D"):
                eGType = ogr.wkbGeometryCollection25D
            elif EQUAL(args[iArg+1],"MULTIPOINT25D"):
                eGType = ogr.wkbMultiPoint25D
            elif EQUAL(args[iArg+1],"MULTILINESTRING25D"):
                eGType = ogr.wkbMultiLineString25D
            elif EQUAL(args[iArg+1],"MULTIPOLYGON25D"):
                eGType = ogr.wkbMultiPolygon25D
            else:
                print("-nlt %s: type not recognised." % args[iArg+1])
                return False

            iArg = iArg + 1

        elif EQUAL(args[iArg],"-dim") and iArg < nArgc-1:

            nCoordDim = int(args[iArg+1])
            if nCoordDim != 2 and nCoordDim != 3:
                print("-dim %s: value not handled." % args[iArg+1])
                return False
            iArg = iArg + 1

        elif (EQUAL(args[iArg],"-tg") or \
                EQUAL(args[iArg],"-gt")) and iArg < nArgc-1:
            iArg = iArg + 1
            nGroupTransactions = int(args[iArg])

        elif EQUAL(args[iArg],"-s_srs") and iArg < nArgc-1:
            iArg = iArg + 1
            pszSourceSRSDef = args[iArg]

        elif EQUAL(args[iArg],"-a_srs") and iArg < nArgc-1:
            iArg = iArg + 1
            pszOutputSRSDef = args[iArg]
            if EQUAL(pszOutputSRSDef, "NULL") or \
               EQUAL(pszOutputSRSDef, "NONE"):
                pszOutputSRSDef = None
                bNullifyOutputSRS = True

        elif EQUAL(args[iArg],"-t_srs") and iArg < nArgc-1:
            iArg = iArg + 1
            pszOutputSRSDef = args[iArg]
            bTransform = True

        elif EQUAL(args[iArg],"-spat") and iArg + 4 < nArgc:
            oRing = ogr.Geometry(ogr.wkbLinearRing)

            oRing.AddPoint_2D( float(args[iArg+1]), float(args[iArg+2]) )
            oRing.AddPoint_2D( float(args[iArg+1]), float(args[iArg+4]) )
            oRing.AddPoint_2D( float(args[iArg+3]), float(args[iArg+4]) )
            oRing.AddPoint_2D( float(args[iArg+3]), float(args[iArg+2]) )
            oRing.AddPoint_2D( float(args[iArg+1]), float(args[iArg+2]) )

            poSpatialFilter = ogr.Geometry(ogr.wkbPolygon)
            poSpatialFilter.AddGeometry(oRing)
            iArg = iArg + 4

        elif EQUAL(args[iArg],"-where") and iArg < nArgc-1:
            iArg = iArg + 1
            pszWHERE = args[iArg]

        elif EQUAL(args[iArg],"-select") and iArg < nArgc-1:
            iArg = iArg + 1
            pszSelect = args[iArg]
            if pszSelect.find(',') != -1:
                papszSelFields = pszSelect.split(',')
            else:
                papszSelFields = pszSelect.split(' ')
            if papszSelFields[0] == '':
                papszSelFields = []

        elif EQUAL(args[iArg],"-simplify") and iArg < nArgc-1:
            iArg = iArg + 1
            eGeomOp = GeomOperation.SIMPLIFY_PRESERVE_TOPOLOGY
            dfGeomOpParam = float(args[iArg])

        elif EQUAL(args[iArg],"-segmentize") and iArg < nArgc-1:
            iArg = iArg + 1
            eGeomOp = GeomOperation.SEGMENTIZE
            dfGeomOpParam = float(args[iArg])

        elif EQUAL(args[iArg],"-fieldTypeToString") and iArg < nArgc-1:
            iArg = iArg + 1
            pszFieldTypeToString = args[iArg]
            if pszFieldTypeToString.find(',') != -1:
                tokens = pszFieldTypeToString.split(',')
            else:
                tokens = pszFieldTypeToString.split(' ')

            for token in tokens:
                if EQUAL(token,"Integer") or \
                    EQUAL(token,"Real") or \
                    EQUAL(token,"String") or \
                    EQUAL(token,"Date") or \
                    EQUAL(token,"Time") or \
                    EQUAL(token,"DateTime") or \
                    EQUAL(token,"Binary") or \
                    EQUAL(token,"IntegerList") or \
                    EQUAL(token,"RealList") or \
                    EQUAL(token,"StringList"):

                    papszFieldTypesToString.append(token)

                elif EQUAL(token,"All"):
                    papszFieldTypesToString = [ 'All' ]
                    break

                else:
                    print("Unhandled type for fieldtypeasstring option : %s " % token)
                    return Usage()

        elif EQUAL(args[iArg],"-progress"):
            bDisplayProgress = True

        #elif EQUAL(args[iArg],"-wrapdateline") )
        #{
        #    bWrapDateline = True;
        #}
        #
        elif EQUAL(args[iArg],"-clipsrc") and iArg < nArgc-1:

            bClipSrc = True
            if IsNumber(args[iArg+1]) and iArg < nArgc - 4:
                oRing = ogr.Geometry(ogr.wkbLinearRing)

                oRing.AddPoint_2D( float(args[iArg+1]), float(args[iArg+2]) )
                oRing.AddPoint_2D( float(args[iArg+1]), float(args[iArg+4]) )
                oRing.AddPoint_2D( float(args[iArg+3]), float(args[iArg+4]) )
                oRing.AddPoint_2D( float(args[iArg+3]), float(args[iArg+2]) )
                oRing.AddPoint_2D( float(args[iArg+1]), float(args[iArg+2]) )

                poClipSrc = ogr.Geometry(ogr.wkbPolygon)
                poClipSrc.AddGeometry(oRing)
                iArg = iArg + 4

            elif (len(args[iArg+1]) >= 7 and EQUAL(args[iArg+1][0:7],"POLYGON") ) or \
                  (len(args[iArg+1]) >= 12 and EQUAL(args[iArg+1][0:12],"MULTIPOLYGON") ) :
                poClipSrc = ogr.CreateGeometryFromWkt(args[iArg+1])
                if poClipSrc is None:
                    print("FAILURE: Invalid geometry. Must be a valid POLYGON or MULTIPOLYGON WKT\n")
                    return Usage()

                iArg = iArg + 1

            elif EQUAL(args[iArg+1],"spat_extent"):
                iArg = iArg + 1

            else:
                pszClipSrcDS = args[iArg+1]
                iArg = iArg + 1

        elif EQUAL(args[iArg],"-clipsrcsql") and iArg < nArgc-1:
            pszClipSrcSQL = args[iArg+1]
            iArg = iArg + 1

        elif EQUAL(args[iArg],"-clipsrclayer") and iArg < nArgc-1:
            pszClipSrcLayer = args[iArg+1]
            iArg = iArg + 1

        elif EQUAL(args[iArg],"-clipsrcwhere") and iArg < nArgc-1:
            pszClipSrcWhere = args[iArg+1]
            iArg = iArg + 1

        elif EQUAL(args[iArg],"-clipdst") and iArg < nArgc-1:

            if IsNumber(args[iArg+1]) and iArg < nArgc - 4:
                oRing = ogr.Geometry(ogr.wkbLinearRing)

                oRing.AddPoint_2D( float(args[iArg+1]), float(args[iArg+2]) )
                oRing.AddPoint_2D( float(args[iArg+1]), float(args[iArg+4]) )
                oRing.AddPoint_2D( float(args[iArg+3]), float(args[iArg+4]) )
                oRing.AddPoint_2D( float(args[iArg+3]), float(args[iArg+2]) )
                oRing.AddPoint_2D( float(args[iArg+1]), float(args[iArg+2]) )

                poClipDst = ogr.Geometry(ogr.wkbPolygon)
                poClipDst.AddGeometry(oRing)
                iArg = iArg + 4

            elif (len(args[iArg+1]) >= 7 and EQUAL(args[iArg+1][0:7],"POLYGON") ) or \
                  (len(args[iArg+1]) >= 12 and EQUAL(args[iArg+1][0:12],"MULTIPOLYGON") ) :
                poClipDst = ogr.CreateGeometryFromWkt(args[iArg+1])
                if poClipDst is None:
                    print("FAILURE: Invalid geometry. Must be a valid POLYGON or MULTIPOLYGON WKT\n")
                    return Usage()

                iArg = iArg + 1

            elif EQUAL(args[iArg+1],"spat_extent"):
                iArg = iArg + 1

            else:
                pszClipDstDS = args[iArg+1]
                iArg = iArg + 1

        elif EQUAL(args[iArg],"-clipdstsql") and iArg < nArgc-1:
            pszClipDstSQL = args[iArg+1]
            iArg = iArg + 1

        elif EQUAL(args[iArg],"-clipdstlayer") and iArg < nArgc-1:
            pszClipDstLayer = args[iArg+1]
            iArg = iArg + 1

        elif EQUAL(args[iArg],"-clipdstwhere") and iArg < nArgc-1:
            pszClipDstWhere = args[iArg+1]
            iArg = iArg + 1

        elif EQUAL(args[iArg],"-explodecollections"):
            bExplodeCollections = True

        elif EQUAL(args[iArg],"-zfield") and iArg < nArgc-1:
            pszZField = args[iArg+1]
            iArg = iArg + 1

        elif args[iArg][0] == '-':
            return Usage()

        elif pszDestDataSource is None:
            pszDestDataSource = args[iArg]
        elif pszDataSource is None:
            pszDataSource = args[iArg]
        else:
            papszLayers.append (args[iArg] )

        iArg = iArg + 1

    if pszDataSource is None:
        return Usage()

    if bPreserveFID and bExplodeCollections:
        print("FAILURE: cannot use -preserve_fid and -explodecollections at the same time\n\n")
        return Usage()

    if bClipSrc and pszClipSrcDS is not None:
        poClipSrc = LoadGeometry(pszClipSrcDS, pszClipSrcSQL, pszClipSrcLayer, pszClipSrcWhere)
        if poClipSrc is None:
            print("FAILURE: cannot load source clip geometry\n" )
            return Usage()

    elif bClipSrc and poClipSrc is None:
        if poSpatialFilter is not None:
            poClipSrc = poSpatialFilter.Clone()
        if poClipSrc is None:
            print("FAILURE: -clipsrc must be used with -spat option or a\n" + \
                  "bounding box, WKT string or datasource must be specified\n")
            return Usage()

    if pszClipDstDS is not None:
        poClipDst = LoadGeometry(pszClipDstDS, pszClipDstSQL, pszClipDstLayer, pszClipDstWhere)
        if poClipDst is None:
            print("FAILURE: cannot load dest clip geometry\n" )
            return Usage()

# --------------------------------------------------------------------
#      Open data source.
# --------------------------------------------------------------------
    poDS = ogr.Open( pszDataSource, False )

# --------------------------------------------------------------------
#      Report failure
# --------------------------------------------------------------------
    if poDS is None:
        print("FAILURE:\n" + \
                "Unable to open datasource `%s' with the following drivers." % pszDataSource)

        for iDriver in range(ogr.GetDriverCount()):
            print("  ->  " + ogr.GetDriver(iDriver).GetName() )

        return False

# --------------------------------------------------------------------
#      Try opening the output datasource as an existing, writable
# --------------------------------------------------------------------
    poODS = None
    poDriver = None

    if bUpdate:
        poODS = ogr.Open( pszDestDataSource, True )
        if poODS is None:

            if bOverwrite or bAppend:
                poODS = ogr.Open( pszDestDataSource, False )
                if poODS is None:
                    # the datasource doesn't exist at all
                    bUpdate = False
                else:
                    poODS.delete()
                    poODS = None

            if bUpdate:
                print("FAILURE:\n" +
                        "Unable to open existing output datasource `%s'." % pszDestDataSource)
                return False

        elif len(papszDSCO) > 0:
            print("WARNING: Datasource creation options ignored since an existing datasource\n" + \
                    "         being updated." )

        if poODS is not None:
            poDriver = poODS.GetDriver()

# --------------------------------------------------------------------
#      Find the output driver.
# --------------------------------------------------------------------
    if not bUpdate:
        poDriver = ogr.GetDriverByName(pszFormat)
        if poDriver is None:
            print("Unable to find driver `%s'." % pszFormat)
            print( "The following drivers are available:" )

            for iDriver in range(ogr.GetDriverCount()):
                print("  ->  %s" % ogr.GetDriver(iDriver).GetName() )

            return False

        if poDriver.TestCapability( ogr.ODrCCreateDataSource ) == False:
            print( "%s driver does not support data source creation." % pszFormat)
            return False

# --------------------------------------------------------------------
#      Special case to improve user experience when translating
#      a datasource with multiple layers into a shapefile. If the
#      user gives a target datasource with .shp and it does not exist,
#      the shapefile driver will try to create a file, but this is not
#      appropriate because here we have several layers, so create
#      a directory instead.
# --------------------------------------------------------------------
        if EQUAL(poDriver.GetName(), "ESRI Shapefile") and \
           pszSQLStatement is None and \
           (len(papszLayers) > 1 or \
            (len(papszLayers) == 0 and poDS.GetLayerCount() > 1)) and \
            pszNewLayerName is None and \
            EQUAL(os.path.splitext(pszDestDataSource)[1], ".SHP") :

            try:
                os.stat(pszDestDataSource)
            except:
                try:
                    # decimal 493 = octal 0755. Python 3 needs 0o755, but
                    # this syntax is only supported by Python >= 2.6
                    os.mkdir(pszDestDataSource, 493)
                except:
                    print("Failed to create directory %s\n"
                          "for shapefile datastore.\n" % pszDestDataSource )
                    return False

# --------------------------------------------------------------------
#      Create the output data source.
# --------------------------------------------------------------------
        poODS = poDriver.CreateDataSource( pszDestDataSource, options = papszDSCO )
        if poODS is None:
            print( "%s driver failed to create %s" % (pszFormat, pszDestDataSource ))
            return False

# --------------------------------------------------------------------
#      Parse the output SRS definition if possible.
# --------------------------------------------------------------------
    if pszOutputSRSDef is not None:
        poOutputSRS = osr.SpatialReference()
        if poOutputSRS.SetFromUserInput( pszOutputSRSDef ) != 0:
            print( "Failed to process SRS definition: %s" % pszOutputSRSDef )
            return False

# --------------------------------------------------------------------
#      Parse the source SRS definition if possible.
# --------------------------------------------------------------------
    if pszSourceSRSDef is not None:
        poSourceSRS = osr.SpatialReference()
        if poSourceSRS.SetFromUserInput( pszSourceSRSDef ) != 0:
            print( "Failed to process SRS definition: %s" % pszSourceSRSDef )
            return False

# --------------------------------------------------------------------
#      For OSM file.
# --------------------------------------------------------------------
    bSrcIsOSM = poDS.GetDriver() is not None and \
                             poDS.GetDriver().GetName() == "OSM"
    nSrcFileSize = 0
    if bSrcIsOSM and poDS.GetName() != "/vsistdin/":
        sStat = gdal.VSIStatL(poDS.GetName())
        if sStat is not None:
            nSrcFileSize = sStat.size

# --------------------------------------------------------------------
#      Special case for -sql clause.  No source layers required.
# --------------------------------------------------------------------
    if pszSQLStatement is not None:
        if pszWHERE is not None:
            print( "-where clause ignored in combination with -sql." )
        if len(papszLayers) > 0:
            print( "layer names ignored in combination with -sql." )

        poResultSet = poDS.ExecuteSQL( pszSQLStatement, poSpatialFilter, \
                                        None )

        if poResultSet is not None:
            nCountLayerFeatures = 0
            if bDisplayProgress:
                if bSrcIsOSM:
                    pfnProgress = progress_func
                    pProgressArg = progress_data

                elif not poResultSet.TestCapability(ogr.OLCFastFeatureCount):
                    print( "Progress turned off as fast feature count is not available.")
                    bDisplayProgress = False

                else:
                    nCountLayerFeatures = poResultSet.GetFeatureCount()
                    pfnProgress = progress_func
                    pProgressArg = progress_data

# --------------------------------------------------------------------
#      Special case to improve user experience when translating into
#      single file shapefile and source has only one layer, and that
#      the layer name isn't specified
# --------------------------------------------------------------------
            if EQUAL(poDriver.GetName(), "ESRI Shapefile") and \
                pszNewLayerName is None:
                try:
                    mode = os.stat(pszDestDataSource).st_mode
                    if (mode & stat.S_IFDIR) == 0:
                        pszNewLayerName = os.path.splitext(os.path.basename(pszDestDataSource))[0]
                except:
                    pass


            psInfo = SetupTargetLayer(  poDS, \
                                        poResultSet,
                                        poODS, \
                                        papszLCO, \
                                        pszNewLayerName, \
                                        bTransform, \
                                        poOutputSRS, \
                                        bNullifyOutputSRS, \
                                        poSourceSRS, \
                                        papszSelFields, \
                                        bAppend, eGType, bPromoteToMulti, nCoordDim, bOverwrite, \
                                        papszFieldTypesToString, \
                                        bWrapDateline, \
                                        bExplodeCollections, \
                                        pszZField, \
                                        pszWHERE )

            poResultSet.ResetReading()

            if psInfo is None or not TranslateLayer( psInfo, poDS, poResultSet, poODS, \
                                poOutputSRS, bNullifyOutputSRS, \
                                eGType, bPromoteToMulti, nCoordDim, \
                                eGeomOp, dfGeomOpParam, \
                                nCountLayerFeatures, \
                                poClipSrc, poClipDst, \
                                bExplodeCollections, \
                                nSrcFileSize, None, \
                                pfnProgress, pProgressArg ):
                print(
                        "Terminating translation prematurely after failed\n" + \
                        "translation from sql statement." )

                return False

            poDS.ReleaseResultSet( poResultSet )


# --------------------------------------------------------------------
#      Special case for layer interleaving mode.
# --------------------------------------------------------------------
    elif bSrcIsOSM and gdal.GetConfigOption("OGR_INTERLEAVED_READING", None) is None:

        gdal.SetConfigOption("OGR_INTERLEAVED_READING", "YES")

        #if (bSplitListFields)
        #{
        #    fprintf( stderr, "FAILURE: -splitlistfields not supported in this mode\n" );
        #    exit( 1 );
        #}

        nSrcLayerCount = poDS.GetLayerCount()
        pasAssocLayers = [ AssociatedLayers() for i in range(nSrcLayerCount) ]

# --------------------------------------------------------------------
#      Special case to improve user experience when translating into
#      single file shapefile and source has only one layer, and that
#      the layer name isn't specified
# --------------------------------------------------------------------

        if EQUAL(poDriver.GetName(), "ESRI Shapefile") and \
           (len(papszLayers) == 1 or nSrcLayerCount == 1) and pszNewLayerName is None:
            try:
                mode = os.stat(pszDestDataSource).st_mode
                if (mode & stat.S_IFDIR) == 0:
                    pszNewLayerName = os.path.splitext(os.path.basename(pszDestDataSource))[0]
            except:
                pass

        if bDisplayProgress and bSrcIsOSM:
            pfnProgress = progress_func
            pProgressArg = progress_data

# --------------------------------------------------------------------
#      If no target layer specified, use all source layers.
# --------------------------------------------------------------------
        if len(papszLayers) == 0:
            papszLayers = [ None for i in range(nSrcLayerCount) ]
            for iLayer in range(nSrcLayerCount):
                poLayer = poDS.GetLayer(iLayer)
                if poLayer is None:
                    print("FAILURE: Couldn't fetch advertised layer %d!" % iLayer)
                    return False

                papszLayers[iLayer] = poLayer.GetName()
        else:
            if bSrcIsOSM:
                osInterestLayers = "SET interest_layers ="
                for iLayer in range(len(papszLayers)):
                    if iLayer != 0:
                        osInterestLayers = osInterestLayers + ","
                    osInterestLayers = osInterestLayers + papszLayers[iLayer]

                poDS.ExecuteSQL(osInterestLayers, None, None)

# --------------------------------------------------------------------
#      First pass to set filters and create target layers.
# --------------------------------------------------------------------
        for iLayer in range(nSrcLayerCount):
            poLayer = poDS.GetLayer(iLayer)
            if poLayer is None:
                print("FAILURE: Couldn't fetch advertised layer %d!" % iLayer)
                return False

            pasAssocLayers[iLayer].poSrcLayer = poLayer

            if CSLFindString(papszLayers, poLayer.GetName()) >= 0:
                if pszWHERE is not None:
                    if poLayer.SetAttributeFilter( pszWHERE ) != 0:
                        print("FAILURE: SetAttributeFilter(%s) on layer '%s' failed.\n" % (pszWHERE, poLayer.GetName()) )
                        if not bSkipFailures:
                            return False

                if poSpatialFilter is not None:
                    poLayer.SetSpatialFilter( poSpatialFilter )

                psInfo = SetupTargetLayer( poDS, \
                                           poLayer, \
                                           poODS, \
                                           papszLCO, \
                                           pszNewLayerName, \
                                           bTransform, \
                                           poOutputSRS, \
                                           bNullifyOutputSRS, \
                                           poSourceSRS, \
                                           papszSelFields, \
                                           bAppend, eGType, bPromoteToMulti, nCoordDim, bOverwrite, \
                                           papszFieldTypesToString, \
                                           bWrapDateline, \
                                           bExplodeCollections, \
                                           pszZField, \
                                           pszWHERE )

                if psInfo is None and not bSkipFailures:
                    return False

                pasAssocLayers[iLayer].psInfo = psInfo
            else:
                pasAssocLayers[iLayer].psInfo = None

# --------------------------------------------------------------------
#      Second pass to process features in a interleaved layer mode.
# --------------------------------------------------------------------
        bHasLayersNonEmpty = True
        while bHasLayersNonEmpty:
            bHasLayersNonEmpty = False

            for iLayer in range(nSrcLayerCount):
                poLayer = pasAssocLayers[iLayer].poSrcLayer
                psInfo = pasAssocLayers[iLayer].psInfo
                anReadFeatureCount = [0]

                if psInfo is not None:
                    if not TranslateLayer(psInfo, poDS, poLayer, poODS, \
                                        poOutputSRS, bNullifyOutputSRS,  \
                                        eGType, bPromoteToMulti, nCoordDim, \
                                        eGeomOp, dfGeomOpParam,  \
                                        0,  \
                                        poClipSrc, poClipDst,  \
                                        bExplodeCollections,  \
                                        nSrcFileSize,  \
                                        anReadFeatureCount, \
                                        pfnProgress, pProgressArg ) \
                        and not bSkipFailures:
                        print(
                                "Terminating translation prematurely after failed\n" + \
                                "translation of layer " + poLayer.GetName() + " (use -skipfailures to skip errors)")

                        return False
                else:
                    # No matching target layer : just consumes the features

                    poFeature = poLayer.GetNextFeature()
                    while poFeature is not None:
                        anReadFeatureCount[0] = anReadFeatureCount[0] + 1
                        poFeature = poLayer.GetNextFeature()

                if anReadFeatureCount[0] != 0:
                    bHasLayersNonEmpty = True

    else:

        nLayerCount = 0
        papoLayers = []

# --------------------------------------------------------------------
#      Process each data source layer.
# --------------------------------------------------------------------
        if len(papszLayers) == 0:
            nLayerCount = poDS.GetLayerCount()
            papoLayers = [None for i in range(nLayerCount)]
            iLayer = 0

            for iLayer in range(nLayerCount):
                poLayer = poDS.GetLayer(iLayer)

                if poLayer is None:
                    print("FAILURE: Couldn't fetch advertised layer %d!" % iLayer)
                    return False

                papoLayers[iLayer] = poLayer
                iLayer = iLayer + 1

# --------------------------------------------------------------------
#      Process specified data source layers.
# --------------------------------------------------------------------
        else:
            nLayerCount = len(papszLayers)
            papoLayers = [None for i in range(nLayerCount)]
            iLayer = 0

            for layername in papszLayers:
                poLayer = poDS.GetLayerByName(layername)

                if poLayer is None:
                    print("FAILURE: Couldn't fetch advertised layer %s!" % layername)
                    return False

                papoLayers[iLayer] = poLayer
                iLayer = iLayer + 1

        panLayerCountFeatures = [0 for i in range(nLayerCount)]
        nCountLayersFeatures = 0
        nAccCountFeatures = 0

        # First pass to apply filters and count all features if necessary
        for iLayer in range(nLayerCount):
            poLayer = papoLayers[iLayer]

            if pszWHERE is not None:
                if poLayer.SetAttributeFilter( pszWHERE ) != 0:
                    print("FAILURE: SetAttributeFilter(%s) failed." % pszWHERE)
                    if not bSkipFailures:
                        return False

            if poSpatialFilter is not None:
                poLayer.SetSpatialFilter( poSpatialFilter )

            if bDisplayProgress and not bSrcIsOSM:
                if not poLayer.TestCapability(ogr.OLCFastFeatureCount):
                    print("Progress turned off as fast feature count is not available.")
                    bDisplayProgress = False
                else:
                    panLayerCountFeatures[iLayer] = poLayer.GetFeatureCount()
                    nCountLayersFeatures += panLayerCountFeatures[iLayer]

        # Second pass to do the real job
        for iLayer in range(nLayerCount):
            poLayer = papoLayers[iLayer]

            if bDisplayProgress:
                if bSrcIsOSM:
                    pfnProgress = progress_func
                    pProgressArg = progress_data
                else:
                    pfnProgress = ScaledProgressFunc
                    pProgressArg = ScaledProgressObject( \
                            nAccCountFeatures * 1.0 / nCountLayersFeatures, \
                            (nAccCountFeatures + panLayerCountFeatures[iLayer]) * 1.0 / nCountLayersFeatures, \
                            progress_func, progress_data)

            nAccCountFeatures += panLayerCountFeatures[iLayer]

# --------------------------------------------------------------------
#      Special case to improve user experience when translating into
#      single file shapefile and source has only one layer, and that
#      the layer name isn't specified
# --------------------------------------------------------------------
            if EQUAL(poDriver.GetName(), "ESRI Shapefile") and \
                nLayerCount == 1 and pszNewLayerName is None:
                try:
                    mode = os.stat(pszDestDataSource).st_mode
                    if (mode & stat.S_IFDIR) == 0:
                        pszNewLayerName = os.path.splitext(os.path.basename(pszDestDataSource))[0]
                except:
                    pass


            psInfo = SetupTargetLayer( poDS, \
                                       poLayer, \
                                       poODS, \
                                       papszLCO, \
                                       pszNewLayerName, \
                                       bTransform, \
                                       poOutputSRS, \
                                       bNullifyOutputSRS, \
                                       poSourceSRS, \
                                       papszSelFields, \
                                       bAppend, eGType, bPromoteToMulti, nCoordDim, bOverwrite, \
                                       papszFieldTypesToString, \
                                       bWrapDateline, \
                                       bExplodeCollections, \
                                       pszZField, \
                                       pszWHERE )

            poLayer.ResetReading()

            if (psInfo is None or \
                not TranslateLayer( psInfo, poDS, poLayer, poODS, \
                                    poOutputSRS, bNullifyOutputSRS, \
                                    eGType, bPromoteToMulti, nCoordDim, \
                                    eGeomOp, dfGeomOpParam, \
                                    panLayerCountFeatures[iLayer], \
                                    poClipSrc, poClipDst, \
                                    bExplodeCollections, \
                                    nSrcFileSize, None, \
                                    pfnProgress, pProgressArg )) \
                and not bSkipFailures:
                print(
                        "Terminating translation prematurely after failed\n" + \
                        "translation of layer " + poLayer.GetLayerDefn().GetName() + " (use -skipfailures to skip errors)")

                return False

# --------------------------------------------------------------------
#      Close down.
# --------------------------------------------------------------------
    # We must explicitly destroy the output dataset in order the file
    # to be properly closed !
    poODS.Destroy()
    poDS.Destroy()

    return True

#**********************************************************************
#                               Usage()
#**********************************************************************

def Usage():

    print( "Usage: ogr2ogr [--help-general] [-skipfailures] [-append] [-update] [-gt n]\n" + \
            "               [-select field_list] [-where restricted_where] \n" + \
            "               [-progress] [-sql <sql statement>] \n" + \
            "               [-spat xmin ymin xmax ymax] [-preserve_fid] [-fid FID]\n" + \
            "               [-a_srs srs_def] [-t_srs srs_def] [-s_srs srs_def]\n" + \
            "               [-f format_name] [-overwrite] [[-dsco NAME=VALUE] ...]\n" + \
            "               [-simplify tolerance]\n" + \
            #// "               [-segmentize max_dist] [-fieldTypeToString All|(type1[,type2]*)]\n" + \
            "               [-fieldTypeToString All|(type1[,type2]*)] [-explodecollections] \n" + \
            "               dst_datasource_name src_datasource_name\n" + \
            "               [-lco NAME=VALUE] [-nln name] [-nlt type] [-dim 2|3] [layer [layer ...]]\n" + \
            "\n" + \
            " -f format_name: output file format name, possible values are:")

    for iDriver in range(ogr.GetDriverCount()):
        poDriver = ogr.GetDriver(iDriver)

        if poDriver.TestCapability( ogr.ODrCCreateDataSource ):
            print( "     -f \"" + poDriver.GetName() + "\"" )

    print( " -append: Append to existing layer instead of creating new if it exists\n" + \
            " -overwrite: delete the output layer and recreate it empty\n" + \
            " -update: Open existing output datasource in update mode\n" + \
            " -progress: Display progress on terminal. Only works if input layers have the \"fast feature count\" capability\n" + \
            " -select field_list: Comma-delimited list of fields from input layer to\n" + \
            "                     copy to the new layer (defaults to all)\n" + \
            " -where restricted_where: Attribute query (like SQL WHERE)\n" + \
            " -sql statement: Execute given SQL statement and save result.\n" + \
            " -skipfailures: skip features or layers that fail to convert\n" + \
            " -gt n: group n features per transaction (default 200)\n" + \
            " -spat xmin ymin xmax ymax: spatial query extents\n" + \
            " -simplify tolerance: distance tolerance for simplification.\n" + \
            #//" -segmentize max_dist: maximum distance between 2 nodes.\n" + \
            #//"                       Used to create intermediate points\n" + \
            " -dsco NAME=VALUE: Dataset creation option (format specific)\n" + \
            " -lco  NAME=VALUE: Layer creation option (format specific)\n" + \
            " -nln name: Assign an alternate name to the new layer\n" + \
            " -nlt type: Force a geometry type for new layer.  One of NONE, GEOMETRY,\n" + \
            "      POINT, LINESTRING, POLYGON, GEOMETRYCOLLECTION, MULTIPOINT,\n" + \
            "      MULTIPOLYGON, or MULTILINESTRING.  Add \"25D\" for 3D layers.\n" + \
            "      Default is type of source layer.\n" + \
            " -dim dimension: Force the coordinate dimension to the specified value.\n" + \
            " -fieldTypeToString type1,...: Converts fields of specified types to\n" + \
            "      fields of type string in the new layer. Valid types are : \n" + \
            "      Integer, Real, String, Date, Time, DateTime, Binary, IntegerList, RealList,\n" + \
            "      StringList. Special value All can be used to convert all fields to strings.")

    print(" -a_srs srs_def: Assign an output SRS\n"
        " -t_srs srs_def: Reproject/transform to this SRS on output\n"
        " -s_srs srs_def: Override source SRS\n"
        "\n"
        " Srs_def can be a full WKT definition (hard to escape properly),\n"
        " or a well known definition (i.e. EPSG:4326) or a file with a WKT\n"
        " definition." )

    return False

def CSLFindString(v, mystr):
    i = 0
    for strIter in v:
        if EQUAL(strIter, mystr):
            return i
        i = i + 1
    return -1

def IsNumber( pszStr):
    try:
        (float)(pszStr)
        return True
    except:
        return False

def LoadGeometry( pszDS, pszSQL, pszLyr, pszWhere):
    poGeom = None

    poDS = ogr.Open( pszDS, False )
    if poDS is None:
        return None

    if pszSQL is not None:
        poLyr = poDS.ExecuteSQL( pszSQL, None, None )
    elif pszLyr is not None:
        poLyr = poDS.GetLayerByName(pszLyr)
    else:
        poLyr = poDS.GetLayer(0)

    if poLyr is None:
        print("Failed to identify source layer from datasource.")
        poDS.Destroy()
        return None

    if pszWhere is not None:
        poLyr.SetAttributeFilter(pszWhere)

    poFeat = poLyr.GetNextFeature()
    while poFeat is not None:
        poSrcGeom = poFeat.GetGeometryRef()
        if poSrcGeom is not None:
            eType = wkbFlatten(poSrcGeom.GetGeometryType())

            if poGeom is None:
                poGeom = ogr.Geometry( ogr.wkbMultiPolygon )

            if eType == ogr.wkbPolygon:
                poGeom.AddGeometry( poSrcGeom )
            elif eType == ogr.wkbMultiPolygon:
                for iGeom in range(poSrcGeom.GetGeometryCount()):
                    poGeom.AddGeometry(poSrcGeom.GetGeometryRef(iGeom) )

            else:
                print("ERROR: Geometry not of polygon type." )
                if pszSQL is not None:
                    poDS.ReleaseResultSet( poLyr )
                poDS.Destroy()
                return None

        poFeat = poLyr.GetNextFeature()

    if pszSQL is not None:
        poDS.ReleaseResultSet( poLyr )
    poDS.Destroy()

    return poGeom


def wkbFlatten(x):
    return x & (~ogr.wkb25DBit)

#**********************************************************************
#                               SetZ()
#**********************************************************************

def SetZ (poGeom, dfZ ):

    if poGeom is None:
        return

    eGType = wkbFlatten(poGeom.GetGeometryType())
    if eGType == ogr.wkbPoint:
        poGeom.SetPoint(0, poGeom.GetX(), poGeom.GetY(), dfZ)

    elif eGType == ogr.wkbLineString or \
         eGType == ogr.wkbLinearRing:
        for i in range(poGeom.GetPointCount()):
            poGeom.SetPoint(i, poGeom.GetX(i), poGeom.GetY(i), dfZ)

    elif eGType == ogr.wkbPolygon or \
         eGType == ogr.wkbMultiPoint or \
         eGType == ogr.wkbMultiLineString or \
         eGType == ogr.wkbMultiPolygon or \
         eGType == ogr.wkbGeometryCollection:
        for i in range(poGeom.GetGeometryCount()):
            SetZ(poGeom.GetGeometryRef(i), dfZ)

#**********************************************************************
#                         SetupTargetLayer()
#**********************************************************************

def SetupTargetLayer( poSrcDS, poSrcLayer, poDstDS, papszLCO, pszNewLayerName, \
                    bTransform,  poOutputSRS, bNullifyOutputSRS, poSourceSRS, papszSelFields, \
                    bAppend, eGType, bPromoteToMulti, nCoordDim, bOverwrite, \
                    papszFieldTypesToString, bWrapDateline, \
                    bExplodeCollections, pszZField, pszWHERE) :

    if pszNewLayerName is None:
        pszNewLayerName = poSrcLayer.GetLayerDefn().GetName()

# --------------------------------------------------------------------
#      Setup coordinate transformation if we need it.
# --------------------------------------------------------------------
    poCT = None

    if bTransform:
        if poSourceSRS is None:
            poSourceSRS = poSrcLayer.GetSpatialRef()

        if poSourceSRS is None:
            print("Can't transform coordinates, source layer has no\n" + \
                    "coordinate system.  Use -s_srs to set one." )
            return None

        poCT = osr.CoordinateTransformation( poSourceSRS, poOutputSRS )
        if gdal.GetLastErrorMsg().find( 'Unable to load PROJ.4 library' ) != -1:
            poCT = None

        if poCT is None:
            pszWKT = None

            print("Failed to create coordinate transformation between the\n" + \
                "following coordinate systems.  This may be because they\n" + \
                "are not transformable, or because projection services\n" + \
                "(PROJ.4 DLL/.so) could not be loaded." )

            pszWKT = poSourceSRS.ExportToPrettyWkt( 0 )
            print( "Source:\n" + pszWKT )

            pszWKT = poOutputSRS.ExportToPrettyWkt( 0 )
            print( "Target:\n" + pszWKT )
            return None

# --------------------------------------------------------------------
#      Get other info.
# --------------------------------------------------------------------
    poSrcFDefn = poSrcLayer.GetLayerDefn()

    if poOutputSRS is None and not bNullifyOutputSRS:
        poOutputSRS = poSrcLayer.GetSpatialRef()

# --------------------------------------------------------------------
#      Find the layer.
# --------------------------------------------------------------------

    # GetLayerByName() can instantiate layers that would have been
    # 'hidden' otherwise, for example, non-spatial tables in a
    # PostGIS-enabled database, so this apparently useless command is
    # not useless. (#4012)
    gdal.PushErrorHandler('CPLQuietErrorHandler')
    poDstLayer = poDstDS.GetLayerByName(pszNewLayerName)
    gdal.PopErrorHandler()
    gdal.ErrorReset()

    iLayer = -1
    if poDstLayer is not None:
        nLayerCount = poDstDS.GetLayerCount()
        for iLayer in range(nLayerCount):
            poLayer = poDstDS.GetLayer(iLayer)
            # The .cpp version compares on pointers directly, but we cannot
            # do this with swig object, so just compare the names.
            if poLayer is not None \
                and poLayer.GetName() == poDstLayer.GetName():
                break

        if (iLayer == nLayerCount):
            # Shouldn't happen with an ideal driver
            poDstLayer = None

# --------------------------------------------------------------------
#      If the user requested overwrite, and we have the layer in
#      question we need to delete it now so it will get recreated
#      (overwritten).
# --------------------------------------------------------------------
    if poDstLayer is not None and bOverwrite:
        if poDstDS.DeleteLayer( iLayer ) != 0:
            print("DeleteLayer() failed when overwrite requested." )
            return None

        poDstLayer = None

# --------------------------------------------------------------------
#      If the layer does not exist, then create it.
# --------------------------------------------------------------------
    if poDstLayer is None:
        if eGType == -2:
            eGType = poSrcFDefn.GetGeomType()

            n25DBit = eGType & ogr.wkb25DBit
            if bPromoteToMulti:
                if wkbFlatten(eGType) == ogr.wkbLineString:
                    eGType = ogr.wkbMultiLineString | n25DBit
                elif wkbFlatten(eGType) == ogr.wkbPolygon:
                    eGType = ogr.wkbMultiPolygon | n25DBit

            if bExplodeCollections:
                if wkbFlatten(eGType) == ogr.wkbMultiPoint:
                    eGType = ogr.wkbPoint | n25DBit
                elif wkbFlatten(eGType) == ogr.wkbMultiLineString:
                    eGType = ogr.wkbLineString | n25DBit
                elif wkbFlatten(eGType) == ogr.wkbMultiPolygon:
                    eGType = ogr.wkbPolygon | n25DBit
                elif wkbFlatten(eGType) == ogr.wkbGeometryCollection:
                    eGType = ogr.wkbUnknown | n25DBit

            if pszZField is not None:
                eGType = eGType | ogr.wkb25DBit

        if nCoordDim == 2:
            eGType = eGType & ~ogr.wkb25DBit
        elif nCoordDim == 3:
            eGType = eGType | ogr.wkb25DBit

        if poDstDS.TestCapability( ogr.ODsCCreateLayer ) == False:
            print("Layer " + pszNewLayerName + "not found, and CreateLayer not supported by driver.")
            return None

        gdal.ErrorReset()

        poDstLayer = poDstDS.CreateLayer( pszNewLayerName, poOutputSRS, \
                                            eGType, papszLCO )

        if poDstLayer is None:
            return None

        bAppend = False

# --------------------------------------------------------------------
#      Otherwise we will append to it, if append was requested.
# --------------------------------------------------------------------
    elif not bAppend:
        print("FAILED: Layer " + pszNewLayerName + "already exists, and -append not specified.\n" + \
                            "        Consider using -append, or -overwrite.")
        return None
    else:
        if len(papszLCO) > 0:
            print("WARNING: Layer creation options ignored since an existing layer is\n" + \
                    "         being appended to." )

# --------------------------------------------------------------------
#      Add fields.  Default to copy all field.
#      If only a subset of all fields requested, then output only
#      the selected fields, and in the order that they were
#      selected.
# --------------------------------------------------------------------

    # Initialize the index-to-index map to -1's
    nSrcFieldCount = poSrcFDefn.GetFieldCount()
    panMap = [ -1 for i in range(nSrcFieldCount) ]

    poDstFDefn = poDstLayer.GetLayerDefn()

    if papszSelFields is not None and not bAppend:

        nDstFieldCount = 0
        if poDstFDefn is not None:
            nDstFieldCount = poDstFDefn.GetFieldCount()

        for iField in range(len(papszSelFields)):

            iSrcField = poSrcFDefn.GetFieldIndex(papszSelFields[iField])
            if iSrcField >= 0:
                poSrcFieldDefn = poSrcFDefn.GetFieldDefn(iSrcField)
                oFieldDefn = ogr.FieldDefn( poSrcFieldDefn.GetNameRef(),
                                            poSrcFieldDefn.GetType() )
                oFieldDefn.SetWidth( poSrcFieldDefn.GetWidth() )
                oFieldDefn.SetPrecision( poSrcFieldDefn.GetPrecision() )

                if papszFieldTypesToString is not None and \
                    (CSLFindString(papszFieldTypesToString, "All") != -1 or \
                    CSLFindString(papszFieldTypesToString, \
                                ogr.GetFieldTypeName(poSrcFieldDefn.GetType())) != -1):

                    oFieldDefn.SetType(ogr.OFTString)

                # The field may have been already created at layer creation
                iDstField = -1
                if poDstFDefn is not None:
                    iDstField = poDstFDefn.GetFieldIndex(oFieldDefn.GetNameRef())
                if iDstField >= 0:
                    panMap[iSrcField] = iDstField
                elif poDstLayer.CreateField( oFieldDefn ) == 0:
                    # now that we've created a field, GetLayerDefn() won't return NULL
                    if poDstFDefn is None:
                        poDstFDefn = poDstLayer.GetLayerDefn()

                    # Sanity check : if it fails, the driver is buggy
                    if poDstFDefn is not None and \
                        poDstFDefn.GetFieldCount() != nDstFieldCount + 1:
                        print("The output driver has claimed to have added the %s field, but it did not!" %  oFieldDefn.GetNameRef() )
                    else:
                        panMap[iSrcField] = nDstFieldCount
                        nDstFieldCount = nDstFieldCount + 1

            else:
                print("Field '" + papszSelFields[iField] + "' not found in source layer.")
                if not bSkipFailures:
                    return None

        # --------------------------------------------------------------------
        # Use SetIgnoredFields() on source layer if available
        # --------------------------------------------------------------------

        # Here we differ from the ogr2ogr.cpp implementation since the OGRFeatureQuery
        # isn't mapped to swig. So in that case just don't use SetIgnoredFields()
        # to avoid issue raised in #4015
        if poSrcLayer.TestCapability(ogr.OLCIgnoreFields) and pszWHERE is None:
            papszIgnoredFields = []
            for iSrcField in range(nSrcFieldCount):
                pszFieldName = poSrcFDefn.GetFieldDefn(iSrcField).GetNameRef()
                bFieldRequested = False
                for iField in range(len(papszSelFields)):
                    if EQUAL(pszFieldName, papszSelFields[iField]):
                        bFieldRequested = True
                        break

                if pszZField is not None and EQUAL(pszFieldName, pszZField):
                    bFieldRequested = True

                # If source field not requested, add it to ignored files list
                if not bFieldRequested:
                    papszIgnoredFields.append(pszFieldName)

            poSrcLayer.SetIgnoredFields(papszIgnoredFields)

    elif not bAppend:

        nDstFieldCount = 0
        if poDstFDefn is not None:
            nDstFieldCount = poDstFDefn.GetFieldCount()

        for iField in range(nSrcFieldCount):

            poSrcFieldDefn = poSrcFDefn.GetFieldDefn(iField)
            oFieldDefn = ogr.FieldDefn( poSrcFieldDefn.GetNameRef(),
                                        poSrcFieldDefn.GetType() )
            oFieldDefn.SetWidth( poSrcFieldDefn.GetWidth() )
            oFieldDefn.SetPrecision( poSrcFieldDefn.GetPrecision() )

            if papszFieldTypesToString is not None and \
                (CSLFindString(papszFieldTypesToString, "All") != -1 or \
                CSLFindString(papszFieldTypesToString, \
                            ogr.GetFieldTypeName(poSrcFieldDefn.GetType())) != -1):

                oFieldDefn.SetType(ogr.OFTString)

            # The field may have been already created at layer creation
            iDstField = -1
            if poDstFDefn is not None:
                 iDstField = poDstFDefn.GetFieldIndex(oFieldDefn.GetNameRef())
            if iDstField >= 0:
                panMap[iField] = iDstField
            elif poDstLayer.CreateField( oFieldDefn ) == 0:
                # now that we've created a field, GetLayerDefn() won't return NULL
                if poDstFDefn is None:
                    poDstFDefn = poDstLayer.GetLayerDefn()

                # Sanity check : if it fails, the driver is buggy
                if poDstFDefn is not None and \
                    poDstFDefn.GetFieldCount() != nDstFieldCount + 1:
                    print("The output driver has claimed to have added the %s field, but it did not!" %  oFieldDefn.GetNameRef() )
                else:
                    panMap[iField] = nDstFieldCount
                    nDstFieldCount = nDstFieldCount + 1

    else:
        # For an existing layer, build the map by fetching the index in the destination
        # layer for each source field
        if poDstFDefn is None:
            print( "poDstFDefn == NULL.\n" )
            return None

        for iField in range(nSrcFieldCount):
            poSrcFieldDefn = poSrcFDefn.GetFieldDefn(iField)
            iDstField = poDstFDefn.GetFieldIndex(poSrcFieldDefn.GetNameRef())
            if iDstField >= 0:
                panMap[iField] = iDstField

    iSrcZField = -1
    if pszZField is not None:
        iSrcZField = poSrcFDefn.GetFieldIndex(pszZField)

    psInfo = TargetLayerInfo()
    psInfo.poDstLayer = poDstLayer
    psInfo.poCT = poCT
    #psInfo.papszTransformOptions = papszTransformOptions
    psInfo.panMap = panMap
    psInfo.iSrcZField = iSrcZField

    return psInfo

#**********************************************************************
#                           TranslateLayer()
#**********************************************************************

def TranslateLayer( psInfo, poSrcDS, poSrcLayer, poDstDS,  \
                    poOutputSRS, bNullifyOutputSRS, \
                    eGType, bPromoteToMulti, nCoordDim, eGeomOp, dfGeomOpParam, \
                    nCountLayerFeatures, \
                    poClipSrc, poClipDst, bExplodeCollections, nSrcFileSize, \
                    pnReadFeatureCount, pfnProgress, pProgressArg) :

    bForceToPolygon = False
    bForceToMultiPolygon = False
    bForceToMultiLineString = False

    poDstLayer = psInfo.poDstLayer
    #papszTransformOptions = psInfo.papszTransformOptions
    poCT = psInfo.poCT
    panMap = psInfo.panMap
    iSrcZField = psInfo.iSrcZField

    if poOutputSRS is None and not bNullifyOutputSRS:
        poOutputSRS = poSrcLayer.GetSpatialRef()

    if wkbFlatten(eGType) == ogr.wkbPolygon:
        bForceToPolygon = True
    elif wkbFlatten(eGType) == ogr.wkbMultiPolygon:
        bForceToMultiPolygon = True
    elif wkbFlatten(eGType) == ogr.wkbMultiLineString:
        bForceToMultiLineString = True

# --------------------------------------------------------------------
#      Transfer features.
# --------------------------------------------------------------------
    nFeaturesInTransaction = 0
    nCount = 0

    if nGroupTransactions > 0:
        poDstLayer.StartTransaction()

    while True:
        poDstFeature = None

        if nFIDToFetch != ogr.NullFID:

            #// Only fetch feature on first pass.
            if nFeaturesInTransaction == 0:
                poFeature = poSrcLayer.GetFeature(nFIDToFetch)
            else:
                poFeature = None

        else:
            poFeature = poSrcLayer.GetNextFeature()

        if poFeature is None:
            break

        nParts = 0
        nIters = 1
        if bExplodeCollections:
            poSrcGeometry = poFeature.GetGeometryRef()
            if poSrcGeometry is not None:
                eSrcType = wkbFlatten(poSrcGeometry.GetGeometryType())
                if eSrcType == ogr.wkbMultiPoint or \
                   eSrcType == ogr.wkbMultiLineString or \
                   eSrcType == ogr.wkbMultiPolygon or \
                   eSrcType == ogr.wkbGeometryCollection:
                        nParts = poSrcGeometry.GetGeometryCount()
                        nIters = nParts
                        if nIters == 0:
                            nIters = 1

        for iPart in range(nIters):
            nFeaturesInTransaction = nFeaturesInTransaction + 1
            if nFeaturesInTransaction == nGroupTransactions:
                poDstLayer.CommitTransaction()
                poDstLayer.StartTransaction()
                nFeaturesInTransaction = 0

            gdal.ErrorReset()
            poDstFeature = ogr.Feature( poDstLayer.GetLayerDefn() )

            if poDstFeature.SetFromWithMap( poFeature, 1, panMap ) != 0:

                if nGroupTransactions > 0:
                    poDstLayer.CommitTransaction()

                print("Unable to translate feature %d from layer %s" % (poFeature.GetFID() , poSrcLayer.GetName() ))

                return False

            if bPreserveFID:
                poDstFeature.SetFID( poFeature.GetFID() )

            poDstGeometry = poDstFeature.GetGeometryRef()
            if poDstGeometry is not None:

                if nParts > 0:
                    # For -explodecollections, extract the iPart(th) of the geometry
                    poPart = poDstGeometry.GetGeometryRef(iPart).Clone()
                    poDstFeature.SetGeometryDirectly(poPart)
                    poDstGeometry = poPart

                if iSrcZField != -1:
                    SetZ(poDstGeometry, poFeature.GetFieldAsDouble(iSrcZField))
                    # This will correct the coordinate dimension to 3
                    poDupGeometry = poDstGeometry.Clone()
                    poDstFeature.SetGeometryDirectly(poDupGeometry)
                    poDstGeometry = poDupGeometry


                if nCoordDim == 2 or nCoordDim == 3:
                    poDstGeometry.SetCoordinateDimension( nCoordDim )

                if eGeomOp == GeomOperation.SEGMENTIZE:
                    pass
                    #if (poDstFeature.GetGeometryRef() is not None and dfGeomOpParam > 0)
                    #    poDstFeature.GetGeometryRef().segmentize(dfGeomOpParam);
                elif eGeomOp == GeomOperation.SIMPLIFY_PRESERVE_TOPOLOGY and dfGeomOpParam > 0:
                    poNewGeom = poDstGeometry.SimplifyPreserveTopology(dfGeomOpParam)
                    if poNewGeom is not None:
                        poDstFeature.SetGeometryDirectly(poNewGeom)
                        poDstGeometry = poNewGeom

                if poClipSrc is not None:
                    poClipped = poDstGeometry.Intersection(poClipSrc)
                    if poClipped is None or poClipped.IsEmpty():
                        # Report progress
                        nCount = nCount +1
                        if pfnProgress is not None:
                            pfnProgress(nCount * 1.0 / nCountLayerFeatures, "", pProgressArg)
                        continue

                    poDstFeature.SetGeometryDirectly(poClipped)
                    poDstGeometry = poClipped

                if poCT is not None:
                    eErr = poDstGeometry.Transform( poCT )
                    if eErr != 0:
                        if nGroupTransactions > 0:
                            poDstLayer.CommitTransaction()

                        print("Failed to reproject feature %d (geometry probably out of source or destination SRS)." % poFeature.GetFID())
                        if not bSkipFailures:
                            return False

                elif poOutputSRS is not None:
                    poDstGeometry.AssignSpatialReference(poOutputSRS)

                if poClipDst is not None:
                    poClipped = poDstGeometry.Intersection(poClipDst)
                    if poClipped is None or poClipped.IsEmpty():
                        continue

                    poDstFeature.SetGeometryDirectly(poClipped)
                    poDstGeometry = poClipped

                if bForceToPolygon:
                    poDstFeature.SetGeometryDirectly(ogr.ForceToPolygon(poDstGeometry))

                elif bForceToMultiPolygon or \
                        (bPromoteToMulti and wkbFlatten(poDstGeometry.GetGeometryType()) == ogr.wkbPolygon):
                    poDstFeature.SetGeometryDirectly(ogr.ForceToMultiPolygon(poDstGeometry))

                elif bForceToMultiLineString or \
                        (bPromoteToMulti and wkbFlatten(poDstGeometry.GetGeometryType()) == ogr.wkbLineString):
                    poDstFeature.SetGeometryDirectly(ogr.ForceToMultiLineString(poDstGeometry))

            gdal.ErrorReset()
            if poDstLayer.CreateFeature( poDstFeature ) != 0 and not bSkipFailures:
                if nGroupTransactions > 0:
                    poDstLayer.RollbackTransaction()

                return False

        # Report progress
        nCount = nCount  + 1
        if pfnProgress is not None:
            if nSrcFileSize != 0:
                if (nCount % 1000) == 0:
                    poFCLayer = poSrcDS.ExecuteSQL("GetBytesRead()", None, None)
                    if poFCLayer is not None:
                        poFeat = poFCLayer.GetNextFeature()
                        if poFeat is not None:
                            pszReadSize = poFeat.GetFieldAsString(0)
                            nReadSize = int(pszReadSize)
                            pfnProgress(nReadSize * 1.0 / nSrcFileSize, "", pProgressArg)
                    poSrcDS.ReleaseResultSet(poFCLayer)
            else:
                pfnProgress(nCount * 1.0 / nCountLayerFeatures, "", pProgressArg)

        if pnReadFeatureCount is not None:
            pnReadFeatureCount[0] = nCount

    if nGroupTransactions > 0:
        poDstLayer.CommitTransaction()

    return True

if __name__ == '__main__':
    version_num = int(gdal.VersionInfo('VERSION_NUM'))
    if version_num < 1800: # because of ogr.GetFieldTypeName
        print('ERROR: Python bindings of GDAL 1.8.0 or later required')
        sys.exit(1)

    if not main(sys.argv):
        sys.exit(1)
    else:
        sys.exit(0)