#!/usr/bin/env python3
#
# Copyright (C) 2022 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# 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, see <http://www.gnu.org/licenses/>.

# T4739 refactor, and remove "on" from segment routing from the configuration

from sys import argv
from sys import exit

from vyos.configtree import ConfigTree

if (len(argv) < 1):
    print("Must specify file name!")
    exit(1)

file_name = argv[1]

with open(file_name, 'r') as f:
    config_file = f.read()

config = ConfigTree(config_file)

# Check if ISIS segment routing is configured. Then check if segment routing "on" exists, then delete the "on" as it is no longer needed. This is for global configuration.
if config.exists(['protocols', 'isis']):
    if config.exists(['protocols', 'isis', 'segment-routing']):
        if config.exists(['protocols', 'isis', 'segment-routing', 'enable']):
            config.delete(['protocols', 'isis', 'segment-routing', 'enable'])

try:
    with open(file_name, 'w') as f:
        f.write(config.to_string())
except OSError as e:
    print(f'Failed to save the modified config: {e}')
    exit(1)