# combo - content management system
# Copyright (C) 2014-2015  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/>.

import requests

from django.conf import settings
from django.core.cache import cache

def is_wcs_enabled(cls):
    return hasattr(settings, 'KNOWN_SERVICES') and settings.KNOWN_SERVICES.get('wcs')

def get_wcs_services():
    if not is_wcs_enabled(None):
        return {}
    return settings.KNOWN_SERVICES.get('wcs')

def get_wcs_json(wcs_url, path):
    if not wcs_url.endswith('/'):
        wcs_url += '/'
    url = wcs_url + path
    response_json = cache.get(url)
    if response_json is None:
        response_json = requests.get(url, headers={'accept': 'application/json'}).json()
        cache.set(url, response_json)
    return response_json

def get_wcs_options(url):
    references = []
    for wcs_key, wcs_site in get_wcs_services().iteritems():
        site_title = wcs_site.get('title')
        response_json = get_wcs_json(wcs_site.get('url'), url)
        if type(response_json) is dict:
            response_json = response_json.get('data')
        for element in response_json:
            slug = element.get('slug')
            title = element.get('title')
            if len(get_wcs_services()) == 1:
                label = title
            else:
                label = '%s : %s' % (site_title, title)
            reference = '%s:%s' % (wcs_key, slug)
            references.append((reference, label))
    references.sort(lambda x, y: cmp(x[1], y[1]))
    return references