# Copyright 2020-2024 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/>.

# - rename CLI node 'dhcpv6-options delgate' to 'dhcpv6-options prefix-delegation
#   interface'
# - rename CLI node 'interface-id' for prefix-delegation to 'address' as it
#   represents the local interface IPv6 address assigned by DHCPv6-PD

from vyos.configtree import ConfigTree

def migrate(config: ConfigTree) -> None:
    for intf_type in config.list_nodes(['interfaces']):
        for intf in config.list_nodes(['interfaces', intf_type]):
            # cache current config tree
            base_path = ['interfaces', intf_type, intf, 'dhcpv6-options',
                          'delegate']

            if config.exists(base_path):
                # cache new config tree
                new_path = ['interfaces', intf_type, intf, 'dhcpv6-options',
                             'prefix-delegation']
                if not config.exists(new_path):
                    config.set(new_path)

                # copy to new node
                config.copy(base_path, new_path + ['interface'])

                # rename interface-id to address
                for interface in config.list_nodes(new_path + ['interface']):
                    config.rename(new_path + ['interface', interface, 'interface-id'], 'address')

                # delete old noe
                config.delete(base_path)