import logging
from typing import Union, List

from elasticsearch import Elasticsearch
import elasticsearch.helpers # type: ignore

from towhee.operator import PyOperator, SharedType # type: ignore


logger = logging.getLogger()


class ESIndex(PyOperator):
    """
    Use bulk to insert docs into ElasticSearch index, using auto id generated.

    Args:
        host (`str`): host to connect ElasticSearch client
        port (`int`): port to connect ElasticSearch client
        user (`str=None`): user name to connect ElasticSearch client, defaults to None
        password (`str=None`): user password to connect ElasticSearch client, defaults to None
        ca_certs (`str=None`): path to CA certificate, defaults to None
    """
    def __init__(self, host: str, port: int, user: str = None, password: str = None, ca_certs: str = None):
        super().__init__()
        try:
            self.client = Elasticsearch(
                f'https://{host}:{port}',
                ca_certs=ca_certs,
                basic_auth=(user, password))
            logger.info('Successfully connected to ElasticSearch client.')
        except Exception as e:
            logger.error('Failed to connect ElasticSearch client:\n', e)
            raise e


    def __call__(self, index_name: str, doc: Union[dict, List[dict]]):
        # if index not exist, create with stop words analyzer to strengthen the search accuracy
        if not self.is_index_exist(index_name):
            logger.info(f'index{index_name} not exists, will create the index with stopwords analyzer')
            self.create_index_with_stopwords(index_name)

        if isinstance(doc, dict):
            docs = [doc]
        else:
            docs = doc

        for x in docs:
            assert isinstance(x, dict)

        actions = [
            {
                '_op_type': 'index',
                '_index': index_name,
                '_source': docs[i] 
            }
            for i in range(len(docs))
        ]
        res = elasticsearch.helpers.bulk(self.client, actions, refresh=True)
        return res

    def is_index_exist(self, index_name: str):
        return self.client.indices.exists(index=index_name)

    def create_index_with_stopwords(self, index_name: str):
        mappings = {
            "properties": {
                "milvus_id": {
                    "type": "long"
                },
                "paragraph": {
                    "type": "text",
                    "analyzer": "my_stop_analyzer",
                    "fields": {
                        "keyword": {
                            "type": "keyword",
                            "ignore_above": 256
                        }
                    }
                },
                "path": {
                    "type": "text",
                    "analyzer": "my_stop_analyzer",
                    "fields": {
                        "keyword": {
                            "type": "keyword",
                            "ignore_above": 256
                        }
                    }
                }
            }
        }
        settings = {
            "analysis": {
                "analyzer": {
                    "my_stop_analyzer": {
                        "type": "stop",
                        "stopwords_path": "stopwords/stopwords-en.txt"
                    }
                }
            },
            "number_of_shards": 3,
            "number_of_replicas": 0
        }
        self.client.indices.create(index=index_name, mappings=mappings, settings=settings)
        logger.info(f"created index{index_name}")