# Copyright 2022-2024 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/>.

# T4739 refactor, and remove "on" from segment routing from the configuration

from vyos.configtree import ConfigTree

def migrate(config: ConfigTree) -> None:
    # Check if ISIS segment routing is configured. Then check if segment
    # routing "on" exists, then delete the "on" as it is no longer needed.
    # This is for global configuration.
    if config.exists(['protocols', 'isis']):
        if config.exists(['protocols', 'isis', 'segment-routing']):
            if config.exists(['protocols', 'isis', 'segment-routing', 'enable']):
                config.delete(['protocols', 'isis', 'segment-routing', 'enable'])