"""
try to use djadhere to authenticate users in matrix
cf https://github.com/matrix-org/matrix-synapse-ldap3/blob/master/ldap_auth_provider.py
"""

import treq
from twisted.internet import defer
from twisted.web import http


class SynapseDjadhere(object):
    def __init__(self, config, account_handler):
        self.auth_api_token = config.auth_api_token
        self.bot_user = config.bot_user
        self.bot_password = config.bot_password

    @defer.inlineCallbacks
    def check_password(self, user_id, password):
        localpart = user_id.split(":", 1)[0][1:]

        bot = (localpart == self.bot_user and password == self.bot_password)

        djadhere_response = yield treq.post(
            'https://adherents.tetaneutral.net/accounts/auth_api/%s/' %
            self.auth_api_token, {
                'username': localpart,
                'password': password
            })
        defer.returnValue(bot or djadhere_response.code == http.OK)

    @staticmethod
    def parse_config(config):
        class _DjadhereConf(object):
            pass

        conf = _DjadhereConf()
        if 'auth_api_token' not in config:
            raise Exception('Synapse-Djadhere needs AUTH_API_TOKEN')
        if 'bot_user' not in config:
            raise Exception('Synapse-Djadhere needs BOT_USER')
        if 'bot_password' not in config:
            raise Exception('Synapse-Djadhere needs BOT_PASSWORD')
        conf.auth_api_token = config['auth_api_token']
        conf.bot_user = config['bot_user']
        conf.bot_password = config['bot_password']

        return conf