#!/usr/bin/env python3
#
# Copyright (C) 2021 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/>.

# T3753: upgrade to FRR8 and move CLI options to better fit with the new FRR CLI

from sys import argv
from vyos.configtree import ConfigTree

def ospf_passive_migration(config, ospf_base):
    if config.exists(ospf_base):
        if config.exists(ospf_base + ['passive-interface']):
            default = False
            for interface in config.return_values(ospf_base + ['passive-interface']):
                if interface == 'default':
                    default = True
                    continue
                config.set(ospf_base + ['interface', interface, 'passive'])

            config.delete(ospf_base + ['passive-interface'])
            config.set(ospf_base + ['passive-interface'], value='default')

        if config.exists(ospf_base + ['passive-interface-exclude']):
            for interface in config.return_values(ospf_base + ['passive-interface-exclude']):
                config.set(ospf_base + ['interface', interface, 'passive', 'disable'])
            config.delete(ospf_base + ['passive-interface-exclude'])

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)

ospfv3_base = ['protocols', 'ospfv3']
if config.exists(ospfv3_base):
    area_base = ospfv3_base + ['area']
    if config.exists(area_base):
        for area in config.list_nodes(area_base):
            if not config.exists(area_base + [area, 'interface']):
                continue

            for interface in config.return_values(area_base + [area, 'interface']):
                config.set(ospfv3_base + ['interface', interface, 'area'], value=area)
                config.set_tag(ospfv3_base + ['interface'])

            config.delete(area_base + [area, 'interface'])

# Migrate OSPF syntax in default VRF
ospf_base = ['protocols', 'ospf']
ospf_passive_migration(config, ospf_base)

vrf_base = ['vrf', 'name']
if config.exists(vrf_base):
    for vrf in config.list_nodes(vrf_base):
        vrf_ospf_base = vrf_base + [vrf, 'protocols', 'ospf']
        if config.exists(vrf_ospf_base):
            ospf_passive_migration(config, vrf_ospf_base)

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)