# 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/>.

# T3090: migrate "firewall options interface <name> adjust-mss" to the
#        individual interface.

from vyos.configtree import ConfigTree
from vyos.ifconfig import Section

base = ['firewall', 'options', 'interface']

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

    for interface in config.list_nodes(base):
        if config.exists(base + [interface, 'disable']):
            continue

        if config.exists(base + [interface, 'adjust-mss']):
            section = Section.section(interface)
            tmp = config.return_value(base + [interface, 'adjust-mss'])

            vlan = interface.split('.')
            base_interface_path = ['interfaces', section, vlan[0]]

            if len(vlan) == 1:
                # Normal interface, no VLAN
                config.set(base_interface_path + ['ip', 'adjust-mss'], value=tmp)
            elif len(vlan) == 2:
                # Regular VIF or VIF-S interface - we need to check the config
                vif = vlan[1]
                if config.exists(base_interface_path + ['vif', vif]):
                    config.set(base_interface_path + ['vif', vif, 'ip', 'adjust-mss'], value=tmp)
                elif config.exists(base_interface_path + ['vif-s', vif]):
                    config.set(base_interface_path + ['vif-s', vif, 'ip', 'adjust-mss'], value=tmp)
            elif len(vlan) == 3:
                # VIF-S interface with VIF-C subinterface
                vif_s = vlan[1]
                vif_c = vlan[2]
                config.set(base_interface_path + ['vif-s', vif_s, 'vif-c', vif_c, 'ip', 'adjust-mss'], value=tmp)
                config.set_tag(base_interface_path + ['vif-s'])
                config.set_tag(base_interface_path + ['vif-s', vif_s, 'vif-c'])

        if config.exists(base + [interface, 'adjust-mss6']):
            section = Section.section(interface)
            tmp = config.return_value(base + [interface, 'adjust-mss6'])

            vlan = interface.split('.')
            base_interface_path = ['interfaces', section, vlan[0]]

            if len(vlan) == 1:
                # Normal interface, no VLAN
                config.set(['interfaces', section, interface, 'ipv6', 'adjust-mss'], value=tmp)
            elif len(vlan) == 2:
                # Regular VIF or VIF-S interface - we need to check the config
                vif = vlan[1]
                if config.exists(base_interface_path + ['vif', vif]):
                    config.set(base_interface_path + ['vif', vif, 'ipv6', 'adjust-mss'], value=tmp)
                    config.set_tag(base_interface_path + ['vif'])
                elif config.exists(base_interface_path + ['vif-s', vif]):
                    config.set(base_interface_path + ['vif-s', vif, 'ipv6', 'adjust-mss'], value=tmp)
                    config.set_tag(base_interface_path + ['vif-s'])
            elif len(vlan) == 3:
                # VIF-S interface with VIF-C subinterface
                vif_s = vlan[1]
                vif_c = vlan[2]
                config.set(base_interface_path + ['vif-s', vif_s, 'vif-c', vif_c, 'ipv6', 'adjust-mss'], value=tmp)
                config.set_tag(base_interface_path + ['vif-s'])
                config.set_tag(base_interface_path + ['vif-s', vif_s, 'vif-c'])

    config.delete(['firewall', 'options'])