# -*- coding: utf-8 -*-
import ldap

from allauth.account.models import EmailAddress
from allauth.socialaccount.providers.base import ProviderAccount
from allauth_cas.providers import CASProvider

from django.conf import settings


class ClipperAccount(ProviderAccount):
    pass


class ClipperProvider(CASProvider):
    id = 'clipper'
    name = 'Clipper'
    account_class = ClipperAccount

    def extract_email(self, data):
        uid, extra = data
        return '{}@clipper.ens.fr'.format(uid.strip().lower())

    def extract_common_fields(self, data):
        def get_names(clipper):
            assert clipper.isalnum()
            try:
                ldap.set_option(ldap.OPT_X_TLS_REQUIRE_CERT,
                                ldap.OPT_X_TLS_NEVER)
                l = ldap.initialize("ldaps://ldap.spi.ens.fr:636")
                l.set_option(ldap.OPT_REFERRALS, 0)
                l.set_option(ldap.OPT_PROTOCOL_VERSION, 3)
                l.set_option(ldap.OPT_X_TLS, ldap.OPT_X_TLS_DEMAND)
                l.set_option(ldap.OPT_X_TLS_DEMAND, True)
                l.set_option(ldap.OPT_DEBUG_LEVEL, 255)
                l.set_option(ldap.OPT_NETWORK_TIMEOUT, 10)
                l.set_option(ldap.OPT_TIMEOUT, 10)

                info = l.search_s('dc=spi,dc=ens,dc=fr',
                                  ldap.SCOPE_SUBTREE,
                                  ('(uid=%s)' % (clipper,)),
                                  [str("cn"), ])

                if len(info) > 0:
                    fullname = info[0][1].get('cn', [''])[0].decode("utf-8")
                    first_name, last_name = fullname.split(' ', 1)
                    return first_name, last_name

            except ldap.LDAPError:
                pass

            return '', ''

        common = super(ClipperProvider, self).extract_common_fields(data)
        fn, ln = get_names(common['username'])
        common['email'] = self.extract_email(data)
        common['name'] = fn
        common['last_name'] = ln
        return common

    def extract_email_addresses(self, data):
        return [
            EmailAddress(
                email=self.extract_email(data),
                verified=True, primary=True,
            ),
        ]

    def extract_extra_data(self, data):
        extra_data = super(ClipperProvider, self).extract_extra_data(data)
        extra_data['email'] = self.extract_email(data)
        return extra_data

    def message_suggest_caslogout_on_logout(self, request):
        return (
            self.get_settings()
            .get('MESSAGE_SUGGEST_CASLOGOUT_ON_LOGOUT', True)
        )


provider_classes = [ClipperProvider]