# Copyright 2021-2024 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/>.

# - T2450: drop interface-route and interface-route6 from "protocols vrf"

from vyos.configtree import ConfigTree

base = ['protocols', 'vrf']

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

    for vrf in config.list_nodes(base):
        static_base = base + [vrf, 'static']
        if not config.exists(static_base):
            continue

        #
        # Migrate interface-route into route
        #
        interface_route_path = static_base + ['interface-route']
        if config.exists(interface_route_path):
            for route in config.list_nodes(interface_route_path):
                interface = config.list_nodes(interface_route_path + [route, 'next-hop-interface'])

                tmp = interface_route_path + [route, 'next-hop-interface']
                for interface in config.list_nodes(tmp):
                    new_base = static_base + ['route', route, 'interface']
                    config.set(new_base)
                    config.set_tag(new_base)
                    config.copy(tmp + [interface], new_base + [interface])

            config.delete(interface_route_path)

        #
        # Migrate interface-route6 into route6
        #
        interface_route_path = static_base + ['interface-route6']
        if config.exists(interface_route_path):
            for route in config.list_nodes(interface_route_path):
                interface = config.list_nodes(interface_route_path + [route, 'next-hop-interface'])

                tmp = interface_route_path + [route, 'next-hop-interface']
                for interface in config.list_nodes(tmp):
                    new_base = static_base + ['route6', route, 'interface']
                    config.set(new_base)
                    config.set_tag(new_base)
                    config.copy(tmp + [interface], new_base + [interface])

            config.delete(interface_route_path)

        #
        # Cleanup nodes inside route
        #
        route_path = static_base + ['route']
        if config.exists(route_path):
            for route in config.list_nodes(route_path):
                next_hop = route_path + [route, 'next-hop']
                if config.exists(next_hop):
                    for gateway in config.list_nodes(next_hop):
                        interface_path = next_hop + [gateway, 'next-hop-interface']
                        if config.exists(interface_path):
                            config.rename(interface_path, 'interface')
                        vrf_path = next_hop + [gateway, 'next-hop-vrf']
                        if config.exists(vrf_path):
                            config.rename(vrf_path, 'vrf')

                next_hop = route_path + [route, 'interface']
                if config.exists(next_hop):
                    for interface in config.list_nodes(next_hop):
                        interface_path = next_hop + [interface, 'next-hop-interface']
                        if config.exists(interface_path):
                            config.rename(interface_path, 'interface')
                        vrf_path = next_hop + [interface, 'next-hop-vrf']
                        if config.exists(vrf_path):
                            config.rename(vrf_path, 'vrf')

        #
        # Cleanup nodes inside route6
        #
        route_path = static_base + ['route6']
        if config.exists(route_path):
            for route in config.list_nodes(route_path):
                next_hop = route_path + [route, 'next-hop']
                if config.exists(next_hop):
                    for gateway in config.list_nodes(next_hop):
                        vrf_path = next_hop + [gateway, 'next-hop-vrf']
                        if config.exists(vrf_path):
                            config.rename(vrf_path, 'vrf')

                next_hop = route_path + [route, 'interface']
                if config.exists(next_hop):
                    for interface in config.list_nodes(next_hop):
                        interface_path = next_hop + [interface, 'next-hop-interface']
                        if config.exists(interface_path):
                            config.rename(interface_path, 'interface')
                        vrf_path = next_hop + [interface, 'next-hop-vrf']
                        if config.exists(vrf_path):
                            config.rename(vrf_path, 'vrf')