# -*- coding: utf-8 -*-

#  This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
#    Copyright (C) 2018-2019 OzzieIsaacs, pwr
#
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU 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 General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program. If not, see <http://www.gnu.org/licenses/>.

from __future__ import division, print_function, unicode_literals
import base64

from flask_simpleldap import LDAP, LDAPException

from .. import constants, logger


log = logger.create()
_ldap = LDAP()


def init_app(app, config):
    global _ldap

    if config.config_login_type != constants.LOGIN_LDAP:
        _ldap = None
        return

    app.config['LDAP_HOST'] = config.config_ldap_provider_url
    app.config['LDAP_PORT'] = config.config_ldap_port
    app.config['LDAP_SCHEMA'] = config.config_ldap_schema
    app.config['LDAP_USERNAME'] = config.config_ldap_user_object.replace('%s', config.config_ldap_serv_username)\
                                  + ',' + config.config_ldap_dn
    app.config['LDAP_PASSWORD'] = base64.b64decode(config.config_ldap_serv_password)
    app.config['LDAP_REQUIRE_CERT'] = bool(config.config_ldap_require_cert)
    if config.config_ldap_require_cert:
        app.config['LDAP_CERT_PATH'] = config.config_ldap_cert_path
    app.config['LDAP_BASE_DN'] = config.config_ldap_dn
    app.config['LDAP_USER_OBJECT_FILTER'] = config.config_ldap_user_object
    app.config['LDAP_USE_SSL'] = bool(config.config_ldap_use_ssl)
    app.config['LDAP_USE_TLS'] = bool(config.config_ldap_use_tls)
    app.config['LDAP_OPENLDAP'] = bool(config.config_ldap_openldap)

    # app.config['LDAP_BASE_DN'] = 'ou=users,dc=yunohost,dc=org'
    # app.config['LDAP_USER_OBJECT_FILTER'] = '(uid=%s)'
    _ldap.init_app(app)



def basic_auth_required(func):
    return _ldap.basic_auth_required(func)


def bind_user(username, password):
    # ulf= _ldap.get_object_details('admin')
    '''Attempts a LDAP login.

    :returns: True if login succeeded, False if login failed, None if server unavailable.
    '''
    try:
        result = _ldap.bind_user(username, password)
        log.debug("LDAP login '%s': %r", username, result)
        return result is not None
    except LDAPException as ex:
        if ex.message == 'Invalid credentials':
            log.info("LDAP login '%s' failed: %s", username, ex)
            return False
        if ex.message == "Can't contact LDAP server":
            log.warning('LDAP Server down: %s', ex)
            return None
        else:
            log.warning('LDAP Server error: %s', ex.message)
            return None