# Copyright 2022-2024 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/>.

# T4170: rename "policy ipv6-route" to "policy route6" to match common
#        IPv4/IPv6 schema
# T4178: Update tcp flags to use multi value node

from vyos.configtree import ConfigTree

base = ['policy']

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

    if config.exists(base + ['ipv6-route']):
        config.rename(base + ['ipv6-route'],'route6')
        config.set_tag(['policy', 'route6'])

    for route in ['route', 'route6']:
        if config.exists(base + [route]):
            for name in config.list_nodes(base + [route]):
                if config.exists(base + [route, name, 'rule']):
                    for rule in config.list_nodes(base + [route, name, 'rule']):
                        rule_tcp_flags = base + [route, name, 'rule', rule, 'tcp', 'flags']

                        if config.exists(rule_tcp_flags):
                            tmp = config.return_value(rule_tcp_flags)
                            config.delete(rule_tcp_flags)
                            for flag in tmp.split(","):
                                for flag in tmp.split(","):
                                    if flag[0] == '!':
                                        config.set(rule_tcp_flags + ['not', flag[1:].lower()])
                                    else:
                                        config.set(rule_tcp_flags + [flag.lower()])

    if config.exists(['interfaces']):
        def if_policy_rename(config, path):
            if config.exists(path + ['policy', 'ipv6-route']):
                config.rename(path + ['policy', 'ipv6-route'], 'route6')

        for if_type in config.list_nodes(['interfaces']):
            for ifname in config.list_nodes(['interfaces', if_type]):
                if_path = ['interfaces', if_type, ifname]
                if_policy_rename(config, if_path)

            for vif_type in ['vif', 'vif-s']:
                if config.exists(if_path + [vif_type]):
                    for vifname in config.list_nodes(if_path + [vif_type]):
                        if_policy_rename(config, if_path + [vif_type, vifname])

                        if config.exists(if_path + [vif_type, vifname, 'vif-c']):
                            for vifcname in config.list_nodes(if_path + [vif_type, vifname, 'vif-c']):
                                if_policy_rename(config, if_path + [vif_type, vifname, 'vif-c', vifcname])