#!/usr/bin/env python3
# ******************************************************************************
#  $Id: pct2rgb.py 05a98f65afa7e5048cae16a58c2268510cd89103 2021-01-15 16:16:00 +0200 Idan Miara $
#
#  Name:     pct2rgb
#  Project:  GDAL Python Interface
#  Purpose:  Utility to convert paletted images into RGB (or RGBA) images.
#  Author:   Frank Warmerdam, warmerdam@pobox.com
#
# ******************************************************************************
#  Copyright (c) 2001, Frank Warmerdam
#  Copyright (c) 2009-2010, Even Rouault <even dot rouault at spatialys.com>
#  Copyright (c) 2020, Idan Miara <idan@miara.com>
#
#  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
import numpy as np

from osgeo import gdal
from osgeo_utils.auxiliary.util import GetOutputDriverFor, open_ds
from osgeo_utils.auxiliary.color_palette import get_color_palette
from osgeo_utils.auxiliary.color_table import get_color_table

progress = gdal.TermProgress_nocb


def Usage():
    print('Usage: pct2rgb.py [-of format] [-b <band>] [-rgba] source_file dest_file')
    return 1


def main(argv):
    driver = None
    src_filename = None
    dst_filename = None
    pct_filename = None
    out_bands = 3
    band_number = 1

    argv = gdal.GeneralCmdLineProcessor(argv)
    if argv is None:
        return 0

    # Parse command line arguments.
    i = 1
    while i < len(argv):
        arg = argv[i]

        if arg == '-of' or arg == '-f':
            i = i + 1
            driver = argv[i]

        if arg == '-ct':
            i = i + 1
            pct_filename = argv[i]

        elif arg == '-b':
            i = i + 1
            band_number = int(argv[i])

        elif arg == '-rgba':
            out_bands = 4

        elif src_filename is None:
            src_filename = argv[i]

        elif dst_filename is None:
            dst_filename = argv[i]

        else:
            return Usage()

        i = i + 1

    if dst_filename is None:
        return Usage()

    _ds, err = doit(src_filename, pct_filename, dst_filename, band_number, out_bands, driver)
    return err


def doit(src_filename, pct_filename, dst_filename, band_number=1, out_bands=3, driver=None):
    # Open source file
    src_ds = open_ds(src_filename)
    if src_ds is None:
        print('Unable to open %s ' % src_filename)
        return None, 1

    src_band = src_ds.GetRasterBand(band_number)

    # ----------------------------------------------------------------------------
    # Ensure we recognise the driver.

    if driver is None:
        driver = GetOutputDriverFor(dst_filename)

    dst_driver = gdal.GetDriverByName(driver)
    if dst_driver is None:
        print('"%s" driver not registered.' % driver)
        return None, 1

    # ----------------------------------------------------------------------------
    # Build color table.

    if pct_filename is not None:
        pal = get_color_palette(pct_filename)
        if pal.has_percents():
            min_val = src_band.GetMinimum()
            max_val = src_band.GetMinimum()
            pal.apply_percent(min_val, max_val)
        ct = get_color_table(pal)
    else:
        ct = src_band.GetRasterColorTable()

    ct_size = ct.GetCount()
    lookup = [np.arange(ct_size),
              np.arange(ct_size),
              np.arange(ct_size),
              np.ones(ct_size) * 255]

    if ct is not None:
        for i in range(ct_size):
            entry = ct.GetColorEntry(i)
            for c in range(4):
                lookup[c][i] = entry[c]

    # ----------------------------------------------------------------------------
    # Create the working file.

    if driver.lower() == 'gtiff':
        tif_filename = dst_filename
    else:
        tif_filename = 'temp.tif'

    gtiff_driver = gdal.GetDriverByName('GTiff')

    tif_ds = gtiff_driver.Create(tif_filename, src_ds.RasterXSize, src_ds.RasterYSize, out_bands)


    # ----------------------------------------------------------------------------
    # We should copy projection information and so forth at this point.

    tif_ds.SetProjection(src_ds.GetProjection())
    tif_ds.SetGeoTransform(src_ds.GetGeoTransform())
    if src_ds.GetGCPCount() > 0:
        tif_ds.SetGCPs(src_ds.GetGCPs(), src_ds.GetGCPProjection())

    # ----------------------------------------------------------------------------
    # Do the processing one scanline at a time.

    progress(0.0)
    for iY in range(src_ds.RasterYSize):
        src_data = src_band.ReadAsArray(0, iY, src_ds.RasterXSize, 1)

        for iBand in range(out_bands):
            band_lookup = lookup[iBand]

            dst_data = np.take(band_lookup, src_data)
            tif_ds.GetRasterBand(iBand + 1).WriteArray(dst_data, 0, iY)

        progress((iY + 1.0) / src_ds.RasterYSize)

    # ----------------------------------------------------------------------------
    # Translate intermediate file to output format if desired format is not TIFF.

    if tif_filename == dst_filename:
        dst_ds = tif_ds
    else:
        dst_ds = dst_driver.CreateCopy(dst_filename or '', tif_ds)
        tif_ds = None
        gtiff_driver.Delete(tif_filename)

    return dst_ds, 0


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