#!/usr/bin/env python3
from typing import Iterable
from subprocess import run


def onu_register(devices: Iterable):
    with open('/etc/dhcp/macs.conf', 'w') as f:
        for dev in devices:
            if not dev.has_attachable_to_subscriber() or dev.mac_addr is None:
                continue
            group_code = dev.group.code
            if not group_code:
                continue
            try:
                mn = dev.get_manager_klass()
                dev_code = mn.tech_code
                f.write('subclass "%(group_code)s.%(dev_code)s" "%(mac)s";\n' % {
                    'group_code': group_code,
                    'mac': dev.mac_addr,
                    'dev_code': dev_code
                })
            except TypeError:
                continue
    run(('/usr/bin/sudo', 'systemctl', 'restart', 'isc-dhcp-server.service'))