# combo - content management system
# Copyright (C) 2015-2018  Entr'ouvert
#
# 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/>.

from django.utils.six.moves.html_parser import HTMLParser
from django.utils.six.moves.urllib import parse as urlparse

from django.conf import settings
from django.template.context import BaseContext
from django.utils.html import strip_tags


def ellipsize(text, length=50):
    text = HTMLParser().unescape(strip_tags(text))
    if len(text) < length:
        return text
    return text[:(length-10)] + '...'


def flatten_context(context):
    # flatten a context to a dictionary, with full support for embedded Context
    # objects.
    flat_context = {}
    if isinstance(context, BaseContext):
        for ctx in context.dicts:
            flat_context.update(flatten_context(ctx))
    else:
        flat_context.update(context)
    return flat_context


def is_url_from_known_service(url):
    netloc = urlparse.urlparse(url).netloc
    if not netloc:
        return True
    for service_id in settings.KNOWN_SERVICES or {}:
        for service_key in settings.KNOWN_SERVICES[service_id]:
            service = settings.KNOWN_SERVICES[service_id][service_key]
            if urlparse.urlparse(service.get('url')).netloc == netloc:
                return True
    return False