# Copyright 2020-2024 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/>.

from vyos.configtree import ConfigTree

def merge_npt(config,base,rule):
    merge_base = ['nat66','source','rule',rule]
    # Configure migration functions
    if config.exists(base + ['description']):
        tmp = config.return_value(base + ['description'])
        config.set(merge_base + ['description'],value=tmp)

    if config.exists(base + ['disable']):
        tmp = config.return_value(base + ['disable'])
        config.set(merge_base + ['disable'],value=tmp)

    if config.exists(base + ['outbound-interface']):
        tmp = config.return_value(base + ['outbound-interface'])
        config.set(merge_base + ['outbound-interface'],value=tmp)

    if config.exists(base + ['source','prefix']):
        tmp = config.return_value(base + ['source','prefix'])
        config.set(merge_base + ['source','prefix'],value=tmp)

    if config.exists(base + ['translation','prefix']):
        tmp = config.return_value(base + ['translation','prefix'])
        config.set(merge_base + ['translation','address'],value=tmp)

def migrate(config: ConfigTree) -> None:
    if not config.exists(['nat', 'nptv6']):
        # Nothing to do
        return

    for rule in config.list_nodes(['nat', 'nptv6', 'rule']):
        base = ['nat', 'nptv6', 'rule', rule]
        # Merge 'nat nptv6' to 'nat66 source'
        merge_npt(config,base,rule)

    # Delete the original NPT configuration
    config.delete(['nat','nptv6']);