#!/usr/bin/env python3

# Copyright (C) 2023 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/>.

# T5154: allow only one ip address per family for parameter 'listen-address'
# Allow only one interface for parameter 'interface'
# If more than one are specified, remove such entries

import sys

from vyos.configtree import ConfigTree
from vyos.template import is_ipv4
from vyos.template import is_ipv6

if len(sys.argv) < 2:
    print("Must specify file name!")
    sys.exit(1)

file_name = sys.argv[1]

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

config = ConfigTree(config_file)

base_path = ['service', 'ntp']
if not config.exists(base_path):
    # Nothing to do
    sys.exit(0)

if config.exists(base_path + ['listen-address']) and (len([addr for addr in config.return_values(base_path + ['listen-address']) if is_ipv4(addr)]) > 1):
    for addr in config.return_values(base_path + ['listen-address']):
        if is_ipv4(addr):
            config.delete_value(base_path + ['listen-address'], addr)

if config.exists(base_path + ['listen-address']) and (len([addr for addr in config.return_values(base_path + ['listen-address']) if is_ipv6(addr)]) > 1):
    for addr in config.return_values(base_path + ['listen-address']):
        if is_ipv6(addr):
            config.delete_value(base_path + ['listen-address'], addr)

if config.exists(base_path + ['interface']):
    if len(config.return_values(base_path + ['interface'])) > 1:
        config.delete(base_path + ['interface'])

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