# 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/>.

# Delete 'protocols bgp address-family ipv6-unicast route-target vpn
# import/export', if 'protocols bgp address-family ipv6-unicast
# route-target vpn both' exists

from vyos.configtree import ConfigTree

def migrate(config: ConfigTree) -> None:
    bgp_base = ['protocols', 'bgp']
    # Delete 'import/export' in default vrf if 'both' exists
    if config.exists(bgp_base):
        for address_family in ['ipv4-unicast', 'ipv6-unicast']:
            rt_path = bgp_base + ['address-family', address_family, 'route-target',
                                  'vpn']
            if config.exists(rt_path + ['both']):
                if config.exists(rt_path + ['import']):
                    config.delete(rt_path + ['import'])
                if config.exists(rt_path + ['export']):
                    config.delete(rt_path + ['export'])

    # Delete import/export in vrfs if both exists
    if config.exists(['vrf', 'name']):
        for vrf in config.list_nodes(['vrf', 'name']):
            vrf_base = ['vrf', 'name', vrf]
            for address_family in ['ipv4-unicast', 'ipv6-unicast']:
                rt_path = vrf_base + bgp_base + ['address-family', address_family,
                                                 'route-target', 'vpn']
                if config.exists(rt_path + ['both']):
                    if config.exists(rt_path + ['import']):
                        config.delete(rt_path + ['import'])
                    if config.exists(rt_path + ['export']):
                        config.delete(rt_path + ['export'])