# Copyright 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/>.

# T3316:
# - Add subnet IDs to existing subnets
# - Move options to option node
# - Migrate address-range to range tagNode

from vyos.configtree import ConfigTree

base = ['service', 'dhcpv6-server', 'shared-network-name']

option_nodes = ['captive-portal', 'domain-search', 'name-server',
                'nis-domain', 'nis-server', 'nisplus-domain', 'nisplus-server',
                'sip-server', 'sntp-server', 'vendor-option']


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

    subnet_id = 1

    for network in config.list_nodes(base):
        if config.exists(base + [network, 'subnet']):
            for subnet in config.list_nodes(base + [network, 'subnet']):
                base_subnet = base + [network, 'subnet', subnet]

                if config.exists(base_subnet + ['address-range']):
                    config.set(base_subnet + ['range'])
                    config.set_tag(base_subnet + ['range'])

                    range_id = 1

                    if config.exists(base_subnet + ['address-range', 'prefix']):
                        for prefix in config.return_values(base_subnet + ['address-range', 'prefix']):
                            config.set(base_subnet + ['range', range_id, 'prefix'], value=prefix)

                            range_id += 1

                    if config.exists(base_subnet + ['address-range', 'start']):
                        for start in config.list_nodes(base_subnet + ['address-range', 'start']):
                            stop = config.return_value(base_subnet + ['address-range', 'start', start, 'stop'])

                            config.set(base_subnet + ['range', range_id, 'start'], value=start)
                            config.set(base_subnet + ['range', range_id, 'stop'], value=stop)

                            range_id += 1

                    config.delete(base_subnet + ['address-range'])

                for option in option_nodes:
                    if config.exists(base_subnet + [option]):
                        config.set(base_subnet + ['option'])
                        config.copy(base_subnet + [option], base_subnet + ['option', option])
                        config.delete(base_subnet + [option])

                config.set(base_subnet + ['subnet-id'], value=subnet_id)
                subnet_id += 1