#!/usr/bin/env python3
# ******************************************************************************
#  $Id: loslas2ntv2.py 19102 2010-03-15 23:41:44Z warmerdam $
#
#  Project:  LOS/LAS to NTv2 Translator
#  Purpose:  Translate one or many LOS/LAS sets into an NTv2 datum shift grid
#            file.
#  Author:   Frank Warmerdam, warmerdam@pobox.com
#  Financial Support: i-cubed (http://www.i-cubed.com)
#
# ******************************************************************************
#  Copyright (c) 2010, Frank Warmerdam
#
# SPDX-License-Identifier: MIT
# ******************************************************************************

import sys

from osgeo import gdal

# dummy object to hold options


class Options(object):
    def __init__(self):
        self.verbose_flag = 0
        self.append = 0
        self.create_self = []
        self.metadata = []
        self.negate = 0


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


def Usage():
    print("Usage: loslas2ntv2.py  [-a] [-auto] [-sub_name name] [-parent name]")
    print("                       [-created date] [-updated date] [-gs_type name]")
    print("                       [-system_f name] [-system_t name] [-version version]")
    print("                       [-major_f axis] [-minor_f axis]")
    print("                       [-major_t axis] [-minor_t axis]")
    print("                       [-negate] [src_file.los]... dst_file.gsb ")
    print("")
    print(" -a: append to existing NTv2 file.")
    print(" -auto: process a whole directory of nad27/hpgn los/las files.")
    print(" -negate: reverse direction of change.")
    print("")
    print("eg.")
    print(" loslas2ntv2.py -auto *.los")
    print(
        " loslas2ntv2.py -system_f NAD27 -system_t NAD83 -sub_name conus conus.los conus.gsb"
    )
    return 2


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


def TranslateLOSLAS(los, ntv2_filename, options):

    # Open the LOS and LAS files.
    los_filename = los[:-4] + ".los"
    las_filename = los[:-4] + ".las"

    los_db = gdal.Open(los_filename)
    las_db = gdal.Open(las_filename)

    # Create (or append to) the NTv2 file.
    create_options = options.create_options
    if options.append == 1:
        create_options.append("APPEND_SUBDATASET=YES")

    ntv2_driver = gdal.GetDriverByName("NTv2")
    ntv2_db = ntv2_driver.Create(
        ntv2_filename,
        los_db.RasterXSize,
        los_db.RasterYSize,
        4,
        gdal.GDT_Float32,
        create_options,
    )

    # Copy georeferencing
    ntv2_db.SetGeoTransform(los_db.GetGeoTransform())

    # Copy offsets.
    data = las_db.ReadAsArray()
    if options.negate:
        data = -1 * data
    ntv2_db.GetRasterBand(1).WriteArray(data)

    data = los_db.ReadAsArray()
    if options.negate:
        data = -1 * data
    ntv2_db.GetRasterBand(2).WriteArray(data)

    if options.metadata:
        ntv2_db.SetMetadata(options.metadata)


# =============================================================================
# Auto-process the normal NOAA director of los/las files, producing a
# NAD27 NTv2 file, and an HPGN NTv2 file.


def auto_noaa(options, loslas_list):

    options.append = 0
    options.verbose_flag = 0

    original_metadata = options.metadata

    have_nad27 = 0
    # have_hpgn = 0

    for los in loslas_list:

        options.create_options = []
        options.metadata = original_metadata
        if los.find("hpgn") != -1:
            ntv2_filename = los[:-4] + ".gsb"
            options.append = 0
            options.negate = 1
            options.metadata.append("SUB_NAME=" + los[:2])
            options.metadata.append("MAJOR_F=6378137.0")
            options.metadata.append("MINOR_F=6356752.31414")
            options.metadata.append("MAJOR_T=6378137.0")
            options.metadata.append("MINOR_T=6356752.31414")
            options.metadata.append("SYSTEM_F=HARN")
            options.metadata.append("SYSTEM_T=NAD83")

        else:
            ntv2_filename = "nad27_usa.gsb"
            options.metadata.append("SUB_NAME=" + los[:-4])
            if have_nad27 == 0:
                options.append = 0
                options.metadata.append("MAJOR_F=6378206.4")
                options.metadata.append("MINOR_F=6356583.8")
                options.metadata.append("MAJOR_T=6378137.0")
                options.metadata.append("MINOR_T=6356752.31414")
                options.metadata.append("SYSTEM_F=NAD27")
                options.metadata.append("SYSTEM_T=NAD83")
            else:
                options.append = 1
            have_nad27 = 1

        print("Integrate %s into %s." % (los, ntv2_filename))

        TranslateLOSLAS(los, ntv2_filename, options)

    return 0


def main(argv=sys.argv):
    ntv2_filename = None
    loslas_list = []
    auto_flag = 0

    options = Options()

    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 == "-v":
            options.verbose_flag = 1

        elif arg == "-version" and i < len(argv) - 1:
            options.metadata.append("VERSION=" + argv[i + 1])
            i = i + 1

        elif arg == "-created" and i < len(argv) - 1:
            options.metadata.append("CREATED=" + argv[i + 1])
            i = i + 1

        elif arg == "-updated" and i < len(argv) - 1:
            options.metadata.append("UPDATED=" + argv[i + 1])
            i = i + 1

        elif arg == "-system_f" and i < len(argv) - 1:
            options.metadata.append("SYSTEM_F=" + argv[i + 1])
            i = i + 1

        elif arg == "-system_t" and i < len(argv) - 1:
            options.metadata.append("SYSTEM_T=" + argv[i + 1])
            i = i + 1

        elif arg == "-parent" and i < len(argv) - 1:
            options.metadata.append("PARENT=" + argv[i + 1])
            i = i + 1

        elif arg == "-sub_name" and i < len(argv) - 1:
            options.metadata.append("SUB_NAME=" + argv[i + 1])
            i = i + 1

        elif arg == "-gs_type" and i < len(argv) - 1:
            options.metadata.append("GS_TYPE=" + argv[i + 1])
            i = i + 1

        elif arg == "-major_f" and i < len(argv) - 1:
            options.metadata.append("MAJOR_F=" + argv[i + 1])
            i = i + 1

        elif arg == "-minor_f" and i < len(argv) - 1:
            options.metadata.append("MINOR_F=" + argv[i + 1])
            i = i + 1

        elif arg == "-major_t" and i < len(argv) - 1:
            options.metadata.append("MAJOR_T=" + argv[i + 1])
            i = i + 1

        elif arg == "-minor_t" and i < len(argv) - 1:
            options.metadata.append("MINOR_T=" + argv[i + 1])
            i = i + 1

        elif arg == "-negate":
            options.negate = 1

        elif arg == "-auto":
            auto_flag = 1

        elif arg == "-a":
            options.append = 1

        elif arg[0] == "-":
            return Usage()

        elif arg[-4:] == ".los" or arg[-4:] == ".las":
            loslas_list.append(arg)

        elif arg[-4:] == ".gsb" and ntv2_filename is None:
            ntv2_filename = arg

        else:
            print("Unrecognized argument: ", arg)
            return Usage()

        i = i + 1

    if not loslas_list:
        print("No .los/.las files specified as input.")
        return Usage()

    if auto_flag == 1:
        auto_noaa(options, loslas_list)

    if ntv2_filename is None:
        print("No NTv2 file specified.")
        return Usage()

    # Process loslas files.

    for los in loslas_list:

        TranslateLOSLAS(los, ntv2_filename, options)
        options.append = 1

    return 0


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