#!/usr/bin/env python3
###############################################################################
# $Id$
#
# Project:  GDAL Python samples
# Purpose:  Script to perform forward and inverse two-dimensional fast
#           Fourier transform.
# Author:   Andrey Kiselev, dron@remotesensing.org
#
###############################################################################
# Copyright (c) 2003, Andrey Kiselev <dron@remotesensing.org>
# Copyright (c) 2009, Even Rouault <even dot rouault at spatialys.com>
#
# SPDX-License-Identifier: MIT
###############################################################################

import sys

try:
    import FFT
except ModuleNotFoundError:
    print("Module FFT not found, cannot continue")
    sys.exit(1)
from osgeo import gdal

# =============================================================================


def Usage():
    print("Usage: fft.py [-inv] [-of out_format] [-ot out_type] infile outfile")
    print("")
    return 2


def ParseType(typ):
    if typ == "Byte":
        return gdal.GDT_Byte
    elif typ == "Int16":
        return gdal.GDT_Int16
    elif typ == "UInt16":
        return gdal.GDT_UInt16
    elif typ == "Int32":
        return gdal.GDT_Int32
    elif typ == "UInt32":
        return gdal.GDT_UInt32
    elif typ == "Float32":
        return gdal.GDT_Float32
    elif typ == "Float64":
        return gdal.GDT_Float64
    elif typ == "CInt16":
        return gdal.GDT_CInt16
    elif typ == "CInt32":
        return gdal.GDT_CInt32
    elif typ == "CFloat32":
        return gdal.GDT_CFloat32
    elif typ == "CFloat64":
        return gdal.GDT_CFloat64
    return gdal.GDT_Byte


def main(argv=sys.argv):
    infile = None
    outfile = None
    driver_name = "GTiff"
    typ = None
    transformation = "forward"

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

        if arg == "-inv":
            transformation = "inverse"
            if typ is None:
                typ = gdal.GDT_Float32

        elif arg == "-of":
            i = i + 1
            driver_name = argv[i]

        elif arg == "-ot":
            i = i + 1
            typ = ParseType(argv[i])
            # set_type = 'yes'

        elif infile is None:
            infile = arg

        elif outfile is None:
            outfile = arg

        else:
            return Usage()

        i = i + 1

    if infile is None:
        return Usage()
    if outfile is None:
        return Usage()

    if typ is None:
        typ = gdal.GDT_CFloat32

    indataset = gdal.Open(infile, gdal.GA_ReadOnly)

    out_driver = gdal.GetDriverByName(driver_name)
    outdataset = out_driver.Create(
        outfile,
        indataset.RasterXSize,
        indataset.RasterYSize,
        indataset.RasterCount,
        typ,
    )

    for iBand in range(1, indataset.RasterCount + 1):
        inband = indataset.GetRasterBand(iBand)
        outband = outdataset.GetRasterBand(iBand)

        data = inband.ReadAsArray(0, 0)
        if transformation == "forward":
            data_tr = FFT.fft2d(data)
        else:
            data_tr = FFT.inverse_fft2d(data)
        outband.WriteArray(data_tr)
    return 0


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