# -*- coding: utf-8 -*-
# copyright 2016 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr -- mailto:contact@logilab.fr
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 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 Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.

"""cubicweb-elasticsearch specific hooks and operations"""

import logging

from elasticsearch import Elasticsearch
from elasticsearch.exceptions import ConnectionError
from urllib3.exceptions import ProtocolError

from cubicweb.server import hook
from cubicweb.predicates import score_entity
from cubes.elasticsearch.es import indexable_types

log = logging.getLogger(__name__)


def entity_indexable(entity):
    return entity.cw_etype in indexable_types(entity._cw.vreg.schema)


class ContentUpdateIndexES(hook.Hook):

    """detect content change and updates ES indexing"""

    __regid__ = 'elasticsearch.contentupdatetoes'
    __select__ = hook.Hook.__select__ & score_entity(entity_indexable)
    events = ('after_update_entity', 'after_add_entity')
    category = 'es'

    def __call__(self):
        if self.entity.cw_etype == 'File':
            return  # FIXME hack!
        locations = self._cw.vreg.config['elasticsearch-locations']
        index_name = self._cw.vreg.config['index-name']
        if locations and index_name:
            es = Elasticsearch(locations and locations.split(','))
            # TODO : have a cache so that we don't check index on every transition
            if not es.indices.exists(index=index_name):
                es.indices.create(index=index_name,
                                  body=INDEX_SETTINGS,
                                  ignore=400)
            # serializer = self.entity.cw_adapt_to('IFTISerializable')
            serializer = self.entity.cw_adapt_to('ISerializable')
            json = serializer.serialize()
            try:
                # TODO option pour coté async ?
                es.index(index=index_name,
                         id=self.entity.eid,
                         doc_type=self.entity.cw_etype,
                         body=json)
            except (ConnectionError, ProtocolError):
                log.debug('Failed to index in hook, could not connect to ES')