# Copyright 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/>.

# Migrate 'tcp-flags' to 'tcp-flags is-set' and 'tcp-flags is-not-set' multi-value nodes (T8250)


from vyos.configtree import ConfigTree

base = ['vpp', 'acl', 'ip', 'tag-name']

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

    for tag_name in config.list_nodes(base):
        base_tag = base + [tag_name, 'rule']
        for rule in config.list_nodes(base_tag):
            base_tcp_flags = base_tag + [rule, 'tcp-flags']

            if not config.exists(base_tcp_flags):
                return

            flags = config.list_nodes(base_tcp_flags)
            set_flags = [flag for flag in flags if flag != 'not']
            not_set_flags = config.list_nodes(base_tcp_flags + ['not'])

            config.delete(base_tcp_flags)

            if set_flags:
                for flag in set_flags:
                    config.set(base_tcp_flags + ['is-set'], value=flag, replace=False)

            if not_set_flags:
                for flag in not_set_flags:
                    config.set(base_tcp_flags + ['is-not-set'], value=flag, replace=False)