# Copyright 2023-2024 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/>.

# T5681: Firewall re-writing. Simplify cli when mathcing interface
# From
#   'set nat [source|destination] rule X [inbound-interface|outbound interface] interface-name <iface>'
#   'set nat [source|destination] rule X [inbound-interface|outbound interface] interface-group <iface_group>'
# to
#   'set nat [source|destination] rule X [inbound-interface|outbound interface] name <iface>'
#   'set nat [source|destination] rule X [inbound-interface|outbound interface] group <iface_group>'
# Also remove command if interface == any

from vyos.configtree import ConfigTree

def migrate(config: ConfigTree) -> None:
    if not config.exists(['nat']):
        # Nothing to do
        return

    for direction in ['source', 'destination']:
        # If a node doesn't exist, we obviously have nothing to do.
        if not config.exists(['nat', direction]):
            continue

        # However, we also need to handle the case when a 'source' or 'destination' sub-node does exist,
        # but there are no rules under it.
        if not config.list_nodes(['nat', direction]):
            continue

        for rule in config.list_nodes(['nat', direction, 'rule']):
            base = ['nat', direction, 'rule', rule]
            for iface in ['inbound-interface','outbound-interface']:
                if config.exists(base + [iface]):
                    if config.exists(base + [iface, 'interface-name']):
                        tmp = config.return_value(base + [iface, 'interface-name'])
                        if tmp != 'any':
                            config.delete(base + [iface, 'interface-name'])
                            if '+' in tmp:
                                tmp = tmp.replace('+', '*')
                            config.set(base + [iface, 'name'], value=tmp)
                        else:
                            config.delete(base + [iface])