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# 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/>.

# Remove network provider name from CLI and rather use provider APN from CLI

from vyos.configtree import ConfigTree

def migrate(config: ConfigTree) -> None:
    base = ['interfaces', 'wirelessmodem']

    if not config.exists(base):
        # Nothing to do
        return

    # list all individual wwan/wireless modem interfaces
    for i in config.list_nodes(base):
        iface = base + [i]

        # only three carries have been supported in the past, thus
        # this will be fairly simple \o/ - and only one (AT&T) did
        # configure an APN
        if config.exists(iface + ['network']):
            network = config.return_value(iface + ['network'])
            if network == "att":
                apn = 'isp.cingular'
                config.set(iface + ['apn'], value=apn)

            config.delete(iface + ['network'])

        # synchronize DNS configuration with PPPoE interfaces to have a
        # uniform CLI experience
        if config.exists(iface + ['no-dns']):
            config.rename(iface + ['no-dns'], 'no-peer-dns')