#!/usr/bin/env python3
#
# Copyright (C) 2019 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 sys
import os
import json
from copy import deepcopy

import vyos.defaults
from vyos.config import Config
from vyos import ConfigError
from vyos.util import cmd
from vyos.util import call

from vyos import airbag
airbag.enable()

config_file = '/etc/vyos/http-api.conf'

vyos_conf_scripts_dir=vyos.defaults.directories['conf_mode']

# XXX: this model will need to be extended for tag nodes
dependencies = [
    'https.py',
]

def get_config(config=None):
    http_api = deepcopy(vyos.defaults.api_data)
    x = http_api.get('api_keys')
    if x is None:
        default_key = None
    else:
        default_key = x[0]
    keys_added = False

    if config:
        conf = config
    else:
        conf = Config()

    if not conf.exists('service https api'):
        return None
    else:
        conf.set_level('service https api')

    if conf.exists('strict'):
        http_api['strict'] = 'true'

    if conf.exists('debug'):
        http_api['debug'] = 'true'

    if conf.exists('port'):
        port = conf.return_value('port')
        http_api['port'] = port

    if conf.exists('keys'):
        for name in conf.list_nodes('keys id'):
            if conf.exists('keys id {0} key'.format(name)):
                key = conf.return_value('keys id {0} key'.format(name))
                new_key = { 'id': name, 'key': key }
                http_api['api_keys'].append(new_key)
                keys_added = True

    if keys_added and default_key:
        if default_key in http_api['api_keys']:
            http_api['api_keys'].remove(default_key)

    return http_api

def verify(http_api):
    return None

def generate(http_api):
    if http_api is None:
        return None

    if not os.path.exists('/etc/vyos'):
        os.mkdir('/etc/vyos')

    with open(config_file, 'w') as f:
        json.dump(http_api, f, indent=2)

    return None

def apply(http_api):
    if http_api is not None:
        call('systemctl restart vyos-http-api.service')
    else:
        call('systemctl stop vyos-http-api.service')

    for dep in dependencies:
        cmd(f'{vyos_conf_scripts_dir}/{dep}', raising=ConfigError)

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