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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/>.

from vyos.configtree import ConfigTree


def migrate(config: ConfigTree) -> None:
    base = ['qos', 'policy', 'cake']
    if config.exists(base):
        for policy in config.list_nodes(base):
            if config.exists(base + [policy, 'flow-isolation']):
                isolation = None
                for isol in config.list_nodes(base + [policy, 'flow-isolation']):
                    if isol == 'nat':
                        config.set(base + [policy, 'flow-isolation-nat'])
                    else:
                        isolation = isol

                config.delete(base + [policy, 'flow-isolation'])

                if isolation:
                    config.set(base + [policy, 'flow-isolation'], value=isolation)