#!/usr/bin/env python3
#
# Copyright (C) 2019-2020 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import os

from netifaces import interfaces
from sys import exit

from vyos.config import Config
from vyos.template import render
from vyos.util import call
from vyos import ConfigError
from vyos import airbag
airbag.enable()

config_file = r'/etc/curlrc'
systemd_action_file = '/lib/systemd/system/ctrl-alt-del.target'

def get_config():
    conf = Config()
    base = ['system', 'options']
    options = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
    return options

def verify(options):
    if 'http_client' in options.keys():
        config = options['http_client']
        if 'source_interface' in config.keys():
            if not config['source_interface'] in interfaces():
                raise ConfigError(f'Source interface {source_interface} does not '
                                  f'exist'.format(**config))

        if {'source_address', 'source_interface'} <= set(config):
            raise ConfigError('Can not define both HTTP source-interface and source-address')

    return None

def generate(options):
    render(config_file, 'system/curlrc.tmpl', options, trim_blocks=True)
    return None

def apply(options):
    # Beep action
    if 'beep_if_fully_booted' in options.keys():
        call('systemctl enable vyos-beep.service')
    else:
        call('systemctl disable vyos-beep.service')

    # Ctrl-Alt-Delete action
    if os.path.exists(systemd_action_file):
        os.unlink(systemd_action_file)

    if 'ctrl_alt_del_action' in options.keys():
        if options['ctrl_alt_del_action'] == 'reboot':
            os.symlink('/lib/systemd/system/reboot.target', systemd_action_file)
        elif options['ctrl_alt_del_action'] == 'poweroff':
            os.symlink('/lib/systemd/system/poweroff.target', systemd_action_file)

    # Reboot system on kernel panic
    with open('/proc/sys/kernel/panic', 'w') as f:
        if 'reboot_on_panic' in options.keys():
            f.write('60')
        else:
            f.write('0')

if __name__ == '__main__':
    try:
        c = get_config()
        verify(c)
        generate(c)
        apply(c)
    except ConfigError as e:
        print(e)
        exit(1)