# 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/>.

# T3316: Migrate to Kea
#        - global-parameters will not function
#        - shared-network-parameters will not function
#        - subnet-parameters will not function
#        - static-mapping-parameters will not function
#        - host-decl-name is on by default, option removed
#        - ping-check no longer supported
#        - failover is default enabled on all subnets that exist on failover servers

from vyos.configtree import ConfigTree

base = ['service', 'dhcp-server']

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

    if config.exists(base + ['host-decl-name']):
        config.delete(base + ['host-decl-name'])

    if config.exists(base + ['global-parameters']):
        config.delete(base + ['global-parameters'])

    if config.exists(base + ['shared-network-name']):
        for network in config.list_nodes(base + ['shared-network-name']):
            base_network = base + ['shared-network-name', network]

            if config.exists(base_network + ['ping-check']):
                config.delete(base_network + ['ping-check'])

            if config.exists(base_network + ['shared-network-parameters']):
                config.delete(base_network +['shared-network-parameters'])

            if not config.exists(base_network + ['subnet']):
                continue

            # Run this for every specified 'subnet'
            for subnet in config.list_nodes(base_network + ['subnet']):
                base_subnet = base_network + ['subnet', subnet]

                if config.exists(base_subnet + ['enable-failover']):
                    config.delete(base_subnet + ['enable-failover'])

                if config.exists(base_subnet + ['ping-check']):
                    config.delete(base_subnet + ['ping-check'])

                if config.exists(base_subnet + ['subnet-parameters']):
                    config.delete(base_subnet + ['subnet-parameters'])

                if config.exists(base_subnet + ['static-mapping']):
                    for mapping in config.list_nodes(base_subnet + ['static-mapping']):
                        if config.exists(base_subnet + ['static-mapping', mapping, 'static-mapping-parameters']):
                            config.delete(base_subnet + ['static-mapping', mapping, 'static-mapping-parameters'])