# Copyright 2021-2024 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library.  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 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.set_tag(ospf_base + ['interface'])

            config.delete(ospf_base + ['passive-interface'])
            if default:
                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.set_tag(ospf_base + ['interface'])
            config.delete(ospf_base + ['passive-interface-exclude'])

ospfv3_base = ['protocols', 'ospfv3']

def migrate(config: ConfigTree) -> None:
    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)