#!/usr/bin/env python3
# ******************************************************************************
#  $Id$
#
#  Project:  GDAL Python Interface
#  Purpose:  Application for filling nodata areas in a raster by interpolation
#  Author:   Frank Warmerdam, warmerdam@pobox.com
#
# ******************************************************************************
#  Copyright (c) 2008, Frank Warmerdam
#  Copyright (c) 2009-2011, Even Rouault <even dot rouault at spatialys.com>
#  Copyright (c) 2021, Idan Miara <idan@miara.com>
#
# SPDX-License-Identifier: MIT
# ******************************************************************************

import sys
import textwrap
from numbers import Real
from typing import Optional

from osgeo import gdal
from osgeo_utils.auxiliary.gdal_argparse import GDALArgumentParser, GDALScript
from osgeo_utils.auxiliary.util import enable_gdal_exceptions


def CopyBand(srcband, dstband):
    for line in range(srcband.YSize):
        line_data = srcband.ReadRaster(0, line, srcband.XSize, 1)
        dstband.WriteRaster(
            0, line, srcband.XSize, 1, line_data, buf_type=srcband.DataType
        )


@enable_gdal_exceptions
def gdal_fillnodata(
    src_filename: Optional[str] = None,
    band_number: int = 1,
    dst_filename: Optional[str] = None,
    driver_name: str = "GTiff",
    creation_options: Optional[list] = None,
    quiet: bool = False,
    mask: str = "default",
    max_distance: Real = 100,
    smoothing_iterations: int = 0,
    interpolation: Optional[str] = None,
    options: Optional[list] = None,
):
    options = options or []
    creation_options = creation_options or []

    if interpolation:
        options.append("INTERPOLATION=" + interpolation)

    # =============================================================================
    # 	Verify we have next gen bindings with the sievefilter method.
    # =============================================================================
    try:
        gdal.FillNodata
    except AttributeError:
        print("")
        print('gdal.FillNodata() not available.  You are likely using "old gen"')
        print("bindings or an older version of the next gen bindings.")
        print("")
        return 1

    # =============================================================================
    # Open source file
    # =============================================================================

    if dst_filename is None:
        src_ds = gdal.Open(src_filename, gdal.GA_Update)
    else:
        src_ds = gdal.Open(src_filename, gdal.GA_ReadOnly)

    if src_ds is None:
        print("Unable to open %s" % src_filename)
        return 1

    srcband = src_ds.GetRasterBand(band_number)

    # =============================================================================
    #       Create output file if one is specified.
    # =============================================================================

    if dst_filename is not None:

        drv = gdal.GetDriverByName(driver_name)
        dst_ds = drv.Create(
            dst_filename,
            src_ds.RasterXSize,
            src_ds.RasterYSize,
            1,
            srcband.DataType,
            creation_options,
        )
        wkt = src_ds.GetProjection()
        if wkt != "":
            dst_ds.SetProjection(wkt)
        gt = src_ds.GetGeoTransform(can_return_null=True)
        if gt:
            dst_ds.SetGeoTransform(gt)

        dstband = dst_ds.GetRasterBand(1)
        ndv = srcband.GetNoDataValue()
        if ndv is not None:
            dstband.SetNoDataValue(ndv)

        color_interp = srcband.GetColorInterpretation()
        dstband.SetColorInterpretation(color_interp)
        if color_interp == gdal.GCI_PaletteIndex:
            color_table = srcband.GetColorTable()
            dstband.SetColorTable(color_table)

        CopyBand(srcband, dstband)

    else:
        dstband = srcband

    # =============================================================================
    # Invoke algorithm.
    # =============================================================================

    if quiet:
        prog_func = None
    else:
        prog_func = gdal.TermProgress_nocb

    if mask == "default":
        maskband = dstband.GetMaskBand()
    else:
        mask_ds = gdal.Open(mask)
        maskband = mask_ds.GetRasterBand(1)

    result = gdal.FillNodata(
        dstband,
        maskband,
        max_distance,
        smoothing_iterations,
        options,
        callback=prog_func,
    )

    src_ds = None
    dst_ds = None
    mask_ds = None

    return result


class GDALFillNoData(GDALScript):
    def __init__(self):
        super().__init__()
        self.title = "Fill raster regions by interpolation from edges"
        self.description = textwrap.dedent(
            """\
            It Fills selection regions (usually nodata areas)
            by interpolating from valid pixels around the edges of the area.
            Additional details on the algorithm are available in the GDALFillNodata() docs."""
        )

    def get_parser(self, argv) -> GDALArgumentParser:
        parser = self.parser

        parser.add_argument(
            "-q",
            "-quiet",
            dest="quiet",
            action="store_true",
            help="The script runs in quiet mode. "
            "The progress monitor is suppressed and routine messages are not displayed.",
        )

        parser.add_argument(
            "-md",
            dest="max_distance",
            type=float,
            default=100,
            metavar="max_distance",
            help="The maximum distance (in pixels) "
            "that the algorithm will search out for values to interpolate. "
            "The default is 100 pixels.",
        )

        parser.add_argument(
            "-si",
            dest="smoothing_iterations",
            type=int,
            default=0,
            metavar="smoothing_iterations",
            help="The number of 3x3 average filter smoothing iterations to run after the interpolation "
            "to dampen artifacts. The default is zero smoothing iterations.",
        )

        parser.add_argument(
            "-o",
            dest="options",
            type=str,
            action="extend",
            nargs="*",
            metavar="name=value",
            help="Specify a special argument to the algorithm.",
        )

        parser.add_argument(
            "-mask",
            dest="mask",
            type=str,
            metavar="filename",
            default="default",
            help="Use the first band of the specified file as a validity mask "
            "(zero is invalid, non-zero is valid).",
        )

        parser.add_argument(
            "-interp",
            "--interpolation",
            dest="interpolation",
            choices=["inv_dist", "nearest"],
            help="Interpolation method.",
        )

        parser.add_argument(
            "-b",
            "-band",
            dest="band_number",
            metavar="band",
            type=int,
            default=1,
            help="The band to operate on, defaults to 1.",
        )

        parser.add_argument(
            "-of",
            dest="driver_name",
            default="GTiff",
            metavar="gdal_format",
            help="Select the output format. Use the short format name.",
        )

        parser.add_argument(
            "-co",
            dest="creation_options",
            type=str,
            default=[],
            action="append",
            metavar="name=value",
            help="Passes a creation option to the output format driver. Multiple "
            "options may be listed. See format specific documentation for legal "
            "creation options for each format.",
        )

        parser.add_argument(
            "src_filename",
            type=str,
            help="The source raster file used to identify target pixels. "
            "Only one band is used.",
        )

        parser.add_argument(
            "dst_filename",
            type=str,
            help="The new file to create with the interpolated result. "
            "If not provided, the source band is updated in place.",
        )

        return parser

    def doit(self, **kwargs):
        return gdal_fillnodata(**kwargs)


def main(argv=sys.argv):
    return GDALFillNoData().main(argv)


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