#!/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/>.
​
# T3976: change cli
#     from: set policy route-map FOO rule 10 match ipv6 nexthop 'h:h:h:h:h:h:h:h'
#       to: set policy route-map FOO rule 10 match ipv6 nexthop address 'h:h:h:h:h:h:h:h'
​
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()
​
base = ['policy', 'route-map']
config = ConfigTree(config_file)
​
if not config.exists(base):
    # Nothing to do
    exit(0)
​
​
for route_map in config.list_nodes(base):
    if not config.exists(base + [route_map, 'rule']):
        continue
    for rule in config.list_nodes(base + [route_map, 'rule']):
        base_rule = base + [route_map, 'rule', rule]
​
        if config.exists(base_rule + ['match', 'ipv6', 'nexthop']):
            tmp = config.return_value(base_rule + ['match', 'ipv6', 'nexthop'])
            config.delete(base_rule + ['match', 'ipv6', 'nexthop'])
            config.set(base_rule + ['match', 'ipv6', 'nexthop', 'address'], value=tmp)
​
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)