# Copyright 2025 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/>.

# T7163: migrate "address-family ipv4|6-unicast redistribute table" from a multi
# leafNode to a tagNode. This is needed to support per table definition of a
# route-map and/or metric

from vyos.configtree import ConfigTree

def migrate(config: ConfigTree) -> None:
    bgp_base = ['protocols', 'bgp']
    if not config.exists(bgp_base):
        return

    for address_family in ['ipv4-unicast', 'ipv6-unicast']:
        # there is no non-main routing table beeing redistributed under this addres family
        # bail out early and continue with next AFI
        table_path = bgp_base + ['address-family', address_family, 'redistribute', 'table']
        if not config.exists(table_path):
            continue

        tables = config.return_values(table_path)
        config.delete(table_path)

        for table in tables:
            config.set(table_path + [table])
            config.set_tag(table_path)