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

# Copyright (C) 2016-2016  RhodeCode GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License, version 3
# (only), as published by the Free Software Foundation.
#
# 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 Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# This program is dual-licensed. If you wish to learn more about the
# RhodeCode Enterprise Edition, including its added features, Support services,
# and proprietary license terms, please see https://rhodecode.com/licenses/

"""
RhodeCode authentication token plugin for built in internal auth
"""

import logging

from sqlalchemy.ext.hybrid import hybrid_property

from rhodecode.translation import _
from rhodecode.authentication.base import RhodeCodeAuthPluginBase, VCS_TYPE
from rhodecode.authentication.routes import AuthnPluginResourceBase
from rhodecode.model.db import User, UserApiKeys


log = logging.getLogger(__name__)


def plugin_factory(plugin_id, *args, **kwds):
    plugin = RhodeCodeAuthPlugin(plugin_id)
    return plugin


class RhodecodeAuthnResource(AuthnPluginResourceBase):
    pass


class RhodeCodeAuthPlugin(RhodeCodeAuthPluginBase):
    """
    Enables usage of authentication tokens for vcs operations.
    """

    def includeme(self, config):
        config.add_authn_plugin(self)
        config.add_authn_resource(self.get_id(), RhodecodeAuthnResource(self))
        config.add_view(
            'rhodecode.authentication.views.AuthnPluginViewBase',
            attr='settings_get',
            request_method='GET',
            route_name='auth_home',
            context=RhodecodeAuthnResource)
        config.add_view(
            'rhodecode.authentication.views.AuthnPluginViewBase',
            attr='settings_post',
            request_method='POST',
            route_name='auth_home',
            context=RhodecodeAuthnResource)

    def get_display_name(self):
        return _('Rhodecode Token Auth')

    @hybrid_property
    def name(self):
        return "authtoken"

    def user_activation_state(self):
        def_user_perms = User.get_default_user().AuthUser.permissions['global']
        return 'hg.register.auto_activate' in def_user_perms

    def allows_authentication_from(
            self, user, allows_non_existing_user=True,
            allowed_auth_plugins=None, allowed_auth_sources=None):
        """
        Custom method for this auth that doesn't accept empty users. And also
        allows rhodecode and authtoken extern_type to auth with this. But only
        via vcs mode
        """
        # only this and rhodecode plugins can use this type
        from rhodecode.authentication.plugins import auth_rhodecode
        allowed_auth_plugins = [
            self.name, auth_rhodecode.RhodeCodeAuthPlugin.name]
        # only for vcs operations
        allowed_auth_sources = [VCS_TYPE]

        return super(RhodeCodeAuthPlugin, self).allows_authentication_from(
            user, allows_non_existing_user=False,
            allowed_auth_plugins=allowed_auth_plugins,
            allowed_auth_sources=allowed_auth_sources)

    def auth(self, userobj, username, password, settings, **kwargs):
        if not userobj:
            log.debug('userobj was:%s skipping' % (userobj, ))
            return None

        user_attrs = {
            "username": userobj.username,
            "firstname": userobj.firstname,
            "lastname": userobj.lastname,
            "groups": [],
            "email": userobj.email,
            "admin": userobj.admin,
            "active": userobj.active,
            "active_from_extern": userobj.active,
            "extern_name": userobj.user_id,
            "extern_type": userobj.extern_type,
        }

        log.debug('Authenticating user with args %s', user_attrs)
        if userobj.active:
            role = UserApiKeys.ROLE_VCS
            active_tokens = [x.api_key for x in
                             User.extra_valid_auth_tokens(userobj, role=role)]
            if userobj.username == username and password in active_tokens:
                log.info(
                    'user `%s` successfully authenticated via %s',
                    user_attrs['username'], self.name)
                return user_attrs
            log.error(
                'user `%s` failed to authenticate via %s, reason: bad or '
                'inactive token.', username, self.name)
        else:
            log.warning(
                'user `%s` failed to authenticate via %s, reason: account not '
                'active.', username, self.name)
        return None