# Copyright 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/>.

# T3417: migrate IS-IS tagNode to node as we can only have one IS-IS process

from vyos.configtree import ConfigTree

base = ['protocols', 'isis']

def migrate(config: ConfigTree) -> None:
    if not config.exists(base):
        # Nothing to do
        return

    if not config.is_tag(base):
        # Nothing to do
        exit(0)

    # Get IS-IS domain ID
    domain_id = config.list_nodes(base)
    if domain_id:
        # We need a temporary copy of the config
        tmp_base = ['protocols', 'isis2']
        config.copy(base + domain_id, tmp_base)

    # Now it's save to delete the old configuration
    config.delete(base)

    # Rename temporary node to new final config (IS-IS domain key is static and
    # no longer required to be set via CLI)
    if config.exists(tmp_base):
        config.rename(tmp_base, 'isis')
