#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""
This is the ES library for Blocky.
It stores the elasticsearch handler and config options.
"""


# Main imports
import cgi
import re
import urllib3
urllib3.disable_warnings()
import elasticsearch

class BlockyESWrapper(object):
    """
       Class for rewriting old-style queries to the new ones,
       where doc_type is an integral part of the DB name
    """
    def __init__(self, ES):
        self.ES = ES

    def get(self, index, doc_type, id):
        return self.ES.get(index = index+'_'+doc_type, doc_type = '_doc', id = id)
    def exists(self, index, doc_type, id):
        return self.ES.exists(index = index+'_'+doc_type, doc_type = '_doc', id = id)
    def exists_doctype(self, index, doc_type):
        return self.ES.indices.exists(index = index+'_'+doc_type)
    def create(self, index, doc_type):
        return self.ES.indices.create(index = index+'_'+doc_type)
    def delete(self, index, doc_type, id):
        return self.ES.delete(index = index+'_'+doc_type, doc_type = '_doc', id = id)
    def index(self, index, doc_type, id, body, refresh = False):
        return self.ES.index(index = index+'_'+doc_type, doc_type = '_doc', id = id, refresh = refresh, body = body)
    def update(self, index, doc_type, id, body):
        return self.ES.update(index = index+'_'+doc_type, doc_type = '_doc', id = id, body = body)
    def search(self, index, doc_type, size = 100, _source_include = None, body = None):
        return self.ES.search(
            index = index+'_'+doc_type,
            doc_type = '_doc',
            size = size,
            _source_include = _source_include,
            body = body
            )
    def count(self, index, doc_type, body = None):
        return self.ES.count(
            index = index+'_'+doc_type,
            doc_type = '_doc',
            body = body
            )


class BlockyDatabase(object):
    def __init__(self, config):
        self.config = config
        self.dbname = config['elasticsearch']['dbname']
        self.ES = elasticsearch.Elasticsearch([{
                'host': config['elasticsearch']['host'],
                'port': int(config['elasticsearch']['port']),
                'use_ssl': config['elasticsearch']['ssl'],
                'verify_certs': False,
                'url_prefix': config['elasticsearch']['uri'] if 'uri' in config['elasticsearch'] else '',
                'http_auth': config['elasticsearch']['auth'] if 'auth' in config['elasticsearch'] else None
            }],
                max_retries=5,
                retry_on_timeout=True
            )

        # IMPORTANT BIT: Figure out if this is ES 6.x or newer.
        # If so, we're using the new ES DB mappings, and need to adjust ALL
        # ES calls to match this.
        es6 = True if int(self.ES.info()['version']['number'].split('.')[0]) >= 6 else False
        if es6:
            self.ES = BlockyESWrapper(self.ES)