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# Copyright 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/>.

# Migrating to named ipv6 pools

from vyos.configtree import ConfigTree

base = ['service', 'ipoe-server']
pool_base = base + ['client-ipv6-pool']

def migrate(config: ConfigTree) -> None:
    if not config.exists(base):
        return

    if not config.exists(pool_base):
        return

    ipv6_pool_name = 'ipv6-pool'
    config.copy(pool_base, pool_base + [ipv6_pool_name])

    if config.exists(pool_base + ['prefix']):
        config.delete(pool_base + ['prefix'])
        config.set(base + ['default-ipv6-pool'], value=ipv6_pool_name)
    if config.exists(pool_base + ['delegate']):
        config.delete(pool_base + ['delegate'])

    # format as tag node
    config.set_tag(pool_base)