#
# This file is part of Plinth.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

"""
Plinth module to configure Privoxy.
"""

from gettext import gettext as _
import json

from plinth import actions
from plinth import action_utils
from plinth import cfg
from plinth import service as service_module


depends = ['plinth.modules.apps']

service = None


def init():
    """Intialize the module."""
    menu = cfg.main_menu.get('apps:index')
    menu.add_urlname(_('Web Proxy (Privoxy)'), 'glyphicon-cloud-upload',
                     'privoxy:index', 1000)

    global service
    service = service_module.Service(
        'privoxy', _('Privoxy Web Proxy'),
        is_external=False, enabled=is_enabled())


def is_enabled():
    """Return whether the module is enabled."""
    return action_utils.service_is_enabled('privoxy')


def is_running():
    """Return whether the service is running."""
    return action_utils.service_is_running('privoxy')


def diagnose():
    """Run diagnostics and return the results."""
    results = []

    results.append(action_utils.diagnose_port_listening(8118, 'tcp4'))
    results.append(action_utils.diagnose_port_listening(8118, 'tcp6'))
    results.append(action_utils.diagnose_url('https://www.debian.org'))
    results.extend(diagnose_url_with_proxy())

    return results


def diagnose_url_with_proxy():
    """Run a diagnostic on a URL with a proxy."""
    url = 'https://debian.org/'

    results = []
    for address in action_utils.get_addresses():
        if address['kind'] == '6':
            address['address'] = '[{0}]'.format(address['address'])

        proxy = 'http://{host}:8118/'.format(host=address['address'])
        if address['kind'] == '4':
            env = {'http_proxy': proxy}
        else:
            env = {'https_proxy': proxy}

        result = action_utils.diagnose_url(url, kind=address['kind'], env=env)
        result[0] = _('Access {url} with proxy {proxy} on tcp{kind}') \
                    .format(url=url, proxy=proxy, kind=address['kind'])
        results.append(result)

    return results