#!/usr/bin/env python
# -*- coding: utf-8 -*-
###############################################################################
# $Id: gdal_edit.py 554eb0a0ced2fbe219a5d7509fa6790df41aff8a 2019-04-16 23:20:05 +0200 Benjamin Leutner $
#
#  Project:  GDAL samples
#  Purpose:  Edit in place various information of an existing GDAL dataset
#  Author:   Even Rouault <even dot rouault at mines dash paris dot org>
#
###############################################################################
#  Copyright (c) 2011-2013, Even Rouault <even dot rouault at mines-paris dot org>
#
#  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.
###############################################################################

import sys
from osgeo import gdal
from osgeo import osr


def Usage():
    print('Usage: gdal_edit [--help-general] [-ro] [-a_srs srs_def] [-a_ullr ulx uly lrx lry]')
    print('                 [-tr xres yres] [-unsetgt] [-unsetrpc] [-a_nodata value] [-unsetnodata]')
    print('                 [-offset value] [-scale value]')
    print('                 [-colorinterp_X red|green|blue|alpha|gray|undefined]*')
    print('                 [-unsetstats] [-stats] [-approx_stats]')
    print('                 [-setstats min max mean stddev]')
    print('                 [-gcp pixel line easting northing [elevation]]*')
    print('                 [-unsetmd] [-oo NAME=VALUE]* [-mo "META-TAG=VALUE"]*  datasetname')
    print('')
    print('Edit in place various information of an existing GDAL dataset.')
    return -1


def ArgIsNumeric(s):
    i = 0

    while i < len(s):
        if (s[i] < '0' or s[i] > '9') and s[i] != '.' and s[i] != 'e' and s[i] != '+' and s[i] != '-':
            return False
        i = i + 1

    return True


def gdal_edit(argv):

    argv = gdal.GeneralCmdLineProcessor(argv)
    if argv is None:
        return -1

    datasetname = None
    srs = None
    ulx = None
    uly = None
    lrx = None
    lry = None
    nodata = None
    unsetnodata = False
    xres = None
    yres = None
    unsetgt = False
    unsetstats = False
    stats = False
    setstats = False
    approx_stats = False
    unsetmd = False
    ro = False
    molist = []
    gcp_list = []
    open_options = []
    offset = []
    scale = []
    colorinterp = {}
    unsetrpc = False

    i = 1
    argc = len(argv)
    while i < argc:
        if argv[i] == '-ro':
            ro = True
        elif argv[i] == '-a_srs' and i < len(argv) - 1:
            srs = argv[i + 1]
            i = i + 1
        elif argv[i] == '-a_ullr' and i < len(argv) - 4:
            ulx = float(argv[i + 1])
            i = i + 1
            uly = float(argv[i + 1])
            i = i + 1
            lrx = float(argv[i + 1])
            i = i + 1
            lry = float(argv[i + 1])
            i = i + 1
        elif argv[i] == '-tr' and i < len(argv) - 2:
            xres = float(argv[i + 1])
            i = i + 1
            yres = float(argv[i + 1])
            i = i + 1
        elif argv[i] == '-a_nodata' and i < len(argv) - 1:
            nodata = float(argv[i + 1])
            i = i + 1
        elif argv[i] == '-scale' and i < len(argv) :
            scale.append(float(argv[i+1]))
            i = i + 1
            while i < len(argv) - 1 and ArgIsNumeric(argv[i+1]):
                scale.append(float(argv[i+1]))
                i = i + 1
        elif argv[i] == '-offset' and i < len(argv) - 1:
            offset.append(float(argv[i+1]))
            i = i + 1
            while i < len(argv) - 1 and ArgIsNumeric(argv[i+1]):
                offset.append(float(argv[i+1]))
                i = i + 1
        elif argv[i] == '-mo' and i < len(argv) - 1:
            molist.append(argv[i + 1])
            i = i + 1
        elif argv[i] == '-gcp' and i + 4 < len(argv):
            pixel = float(argv[i + 1])
            i = i + 1
            line = float(argv[i + 1])
            i = i + 1
            x = float(argv[i + 1])
            i = i + 1
            y = float(argv[i + 1])
            i = i + 1
            if i + 1 < len(argv) and ArgIsNumeric(argv[i + 1]):
                z = float(argv[i + 1])
                i = i + 1
            else:
                z = 0
            gcp = gdal.GCP(x, y, z, pixel, line)
            gcp_list.append(gcp)
        elif argv[i] == '-unsetgt':
            unsetgt = True
        elif argv[i] == '-unsetrpc':
            unsetrpc = True
        elif argv[i] == '-unsetstats':
            unsetstats = True
        elif argv[i] == '-approx_stats':
            stats = True
            approx_stats = True
        elif argv[i] == '-stats':
            stats = True
        elif argv[i] == '-setstats' and i < len(argv)-4:
            stats = True
            setstats = True
            if argv[i + 1] != 'None':
                statsmin = float(argv[i + 1])
            else:
                statsmin = None
            i = i + 1
            if argv[i + 1] != 'None':
                statsmax = float(argv[i + 1])
            else:
                statsmax = None
            i = i + 1
            if argv[i + 1] != 'None':
                statsmean = float(argv[i + 1])
            else:
                statsmean = None
            i = i + 1
            if argv[i + 1] != 'None':
                statsdev = float(argv[i + 1])
            else:
                statsdev = None
            i = i + 1
        elif argv[i] == '-unsetmd':
            unsetmd = True
        elif argv[i] == '-unsetnodata':
            unsetnodata = True
        elif argv[i] == '-oo' and i < len(argv) - 1:
            open_options.append(argv[i + 1])
            i = i + 1
        elif argv[i].startswith('-colorinterp_')and i < len(argv) - 1:
            band = int(argv[i][len('-colorinterp_'):])
            val = argv[i + 1]
            if val.lower() == 'red':
                val = gdal.GCI_RedBand
            elif val.lower() == 'green':
                val = gdal.GCI_GreenBand
            elif val.lower() == 'blue':
                val = gdal.GCI_BlueBand
            elif val.lower() == 'alpha':
                val = gdal.GCI_AlphaBand
            elif val.lower() == 'gray' or val.lower() == 'grey':
                val = gdal.GCI_GrayIndex
            elif val.lower() == 'undefined':
                val = gdal.GCI_Undefined
            else:
                sys.stderr.write('Unsupported color interpretation %s.\n' % val +
                                 'Only red, green, blue, alpha, gray, undefined are supported.\n')
                return Usage()
            colorinterp[band] = val
            i = i + 1
        elif argv[i][0] == '-':
            sys.stderr.write('Unrecognized option : %s\n' % argv[i])
            return Usage()
        elif datasetname is None:
            datasetname = argv[i]
        else:
            sys.stderr.write('Unexpected option : %s\n' % argv[i])
            return Usage()

        i = i + 1

    if datasetname is None:
        return Usage()

    if (srs is None and lry is None and yres is None and not unsetgt and
            not unsetstats and not stats and not setstats and nodata is None and
            not molist and not unsetmd and not gcp_list and
            not unsetnodata and not colorinterp and
            scale is None and offset is None and not unsetrpc):
        print('No option specified')
        print('')
        return Usage()

    exclusive_option = 0
    if lry is not None:
        exclusive_option = exclusive_option + 1
    if yres is not None:
        exclusive_option = exclusive_option + 1
    if unsetgt:
        exclusive_option = exclusive_option + 1
    if exclusive_option > 1:
        print('-a_ullr, -tr and -unsetgt options are exclusive.')
        print('')
        return Usage()

    if unsetstats and stats:
        print('-unsetstats and either -stats or -approx_stats options are exclusive.')
        print('')
        return Usage()

    if unsetnodata and nodata:
        print('-unsetnodata and -nodata options are exclusive.')
        print('')
        return Usage()

    if open_options is not None:
        if ro:
            ds = gdal.OpenEx(datasetname, gdal.OF_RASTER, open_options=open_options)
        else:
            ds = gdal.OpenEx(datasetname, gdal.OF_RASTER | gdal.OF_UPDATE, open_options=open_options)
    # GDAL 1.X compat
    elif ro:
        ds = gdal.Open(datasetname)
    else:
        ds = gdal.Open(datasetname, gdal.GA_Update)
    if ds is None:
        return -1

    if scale:
        if len(scale) == 1:
            scale = scale * ds.RasterCount 
        elif len(scale) != ds.RasterCount:
            print('If more than one scale value is provided, their number must match the number of bands.')
            print('')
            return Usage()
    
    if offset:
        if len(offset) == 1:
            offset = offset * ds.RasterCount
        elif len(offset) != ds.RasterCount:
            print('If more than one offset value is provided, their number must match the number of bands.')
            print('')
            return Usage()
    
    wkt = None
    if srs == '' or srs == 'None':
        ds.SetProjection('')
    elif srs is not None:
        sr = osr.SpatialReference()
        if sr.SetFromUserInput(srs) != 0:
            print('Failed to process SRS definition: %s' % srs)
            return -1
        wkt = sr.ExportToWkt()
        if not gcp_list:
            ds.SetProjection(wkt)

    if lry is not None:
        gt = [ulx, (lrx - ulx) / ds.RasterXSize, 0,
              uly, 0, (lry - uly) / ds.RasterYSize]
        ds.SetGeoTransform(gt)

    if yres is not None:
        gt = ds.GetGeoTransform()
        # Doh ! why is gt a tuple and not an array...
        gt = [gt[j] for j in range(6)]
        gt[1] = xres
        gt[5] = yres
        ds.SetGeoTransform(gt)

    if unsetgt:
        # For now only the GTiff drivers understands full-zero as a hint
        # to unset the geotransform
        if ds.GetDriver().ShortName == 'GTiff':
            ds.SetGeoTransform([0, 0, 0, 0, 0, 0])
        else:
            ds.SetGeoTransform([0, 1, 0, 0, 0, 1])

    if gcp_list:
        if wkt is None:
            wkt = ds.GetGCPProjection()
        if wkt is None:
            wkt = ''
        ds.SetGCPs(gcp_list, wkt)

    if nodata is not None:
        for i in range(ds.RasterCount):
            ds.GetRasterBand(i + 1).SetNoDataValue(nodata)
    elif unsetnodata:
        for i in range(ds.RasterCount):
            ds.GetRasterBand(i + 1).DeleteNoDataValue()

    if scale:
        for i in range(ds.RasterCount):
            ds.GetRasterBand(i + 1).SetScale(scale[i])

    if offset:
        for i in range(ds.RasterCount):
            ds.GetRasterBand(i + 1).SetOffset(offset[i])

    if unsetstats:
        for i in range(ds.RasterCount):
            band = ds.GetRasterBand(i + 1)
            for key in band.GetMetadata().keys():
                if key.startswith('STATISTICS_'):
                    band.SetMetadataItem(key, None)

    if stats:
        for i in range(ds.RasterCount):
            ds.GetRasterBand(i + 1).ComputeStatistics(approx_stats)

    if setstats:
        for i in range(ds.RasterCount):
            if statsmin is None or statsmax is None or statsmean is None or statsdev is None:
                ds.GetRasterBand(i+1).ComputeStatistics(approx_stats)
                min,max,mean,stdev = ds.GetRasterBand(i+1).GetStatistics(approx_stats,True)
                if statsmin is None:
                    statsmin = min
                if statsmax is None:
                    statsmax = max
                if statsmean is None:
                    statsmean = mean
                if statsdev is None:
                    statsdev = stdev
            ds.GetRasterBand(i+1).SetStatistics(statsmin, statsmax, statsmean, statsdev)

    if molist:
        if unsetmd:
            md = {}
        else:
            md = ds.GetMetadata()
        for moitem in molist:
            equal_pos = moitem.find('=')
            if equal_pos > 0:
                md[moitem[0:equal_pos]] = moitem[equal_pos + 1:]
        ds.SetMetadata(md)
    elif unsetmd:
        ds.SetMetadata({})

    for band in colorinterp:
        ds.GetRasterBand(band).SetColorInterpretation(colorinterp[band])

    if unsetrpc:
        ds.SetMetadata(None, 'RPC')

    ds = band = None

    return 0


def main():
    return gdal_edit(sys.argv)


if __name__ == '__main__':
    sys.exit(gdal_edit(sys.argv))
