#!/usr/bin/python3
# -*- coding: utf-8 -*-
## Copyright (C) 2001-2008 Alberto Milone <albertomilone@gmail.com>
## Copyright (C) 2019 Canonical Ltd

## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.

## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.

## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.


import logging
import argparse
import os
import shutil

from xkit import xutils, xorgparser


# Usage:
# /usr/share/screen-resolution-extra/nvidia-polkit --help
#

if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('destination', help='The destination path')
    parser.add_argument("-w", "--write-from", help='write xorg.conf from FILE', metavar='FILE')
    parser.add_argument("-b", "--backup-to", help='backup file to FILE', metavar='FILE')

    args = parser.parse_args()

    if args.backup_to and os.path.isfile(args.destination):
        try:
            shutil.copyfile(args.destination, args.backup_to)
            logging.debug('Making backup of %s to %s' % (args.destination, args.backup_to))
        except IOError as e:
            logging.error('%s' % e)
            exit(1)

    try:
        xutils.XUtils(args.write_from)
        logging.debug('%s is a valid xorg.conf file.' % args.write_from)
    except(IOError, xorgparser.ParseException):#if xorg.conf is missing or broken
        logging.error('%s does not seem to be a valid xorg.conf file.' % args.write_from)
        exit(1)

    try:
        shutil.copyfile(args.write_from, args.destination)
        logging.debug('%s was written successfully to %s.' % (args.write_from, args.destination))
    except IOError as e:
        logging.error('%s' % e)
        exit(1)