from elasticsearch import AsyncElasticsearch
from elasticsearch.helpers import async_bulk

from applications.utils.async_utils import run_tasks_with_asyncio_task_group


class AsyncElasticSearchClient:

    def __init__(self, index_name, hosts, password):
        self.es = AsyncElasticsearch(hosts=hosts, basic_auth=("elastic", password))
        self.index_name = index_name

    async def create_index(self, settings, mappings):
        if await self.es.ping():
            print("ElasticSearch client is up and running")
        else:
            print("ElasticSearch client is not up and running")

        exists = await self.es.indices.exists(index=self.index_name)
        if exists:
            print("index exists")
            await self.es.indices.delete(index=self.index_name)
            print("already delete index")
        try:
            await self.es.indices.create(
                index=self.index_name, settings=settings, mappings=mappings
            )
            print("Index created successfully")
        except Exception as e:
            print("fail to create index, reason:", e)

    async def search(self, query):
        resp = await self.es.search(index=self.index_name, body=query)
        return resp

    async def update(self, obj):
        return await self.es.update(
            index=self.index_name, id=obj["es_id"], body=obj["doc"]
        )

    async def update_by_filed(self, field_name: str, field_value: str, doc: dict):
        try:
            # 先查出 doc_id
            query = {"query": {"term": {field_name: field_value}}}
            resp = await self.es.search(index=self.index_name, body=query)
            if not resp["hits"]["hits"]:
                print(f"No document found with {field_name}={field_value}")
                return None

            task_list = [
                {"es_id": hit["_id"], "doc": doc} for hit in resp["hits"]["hits"]
            ]

            # update by ids
            return await run_tasks_with_asyncio_task_group(
                task_list=task_list,
                handler=self.es.update,
                description="update by filed",
                unit="document",
                max_concurrency=10,
            )
        except Exception as e:
            print(f"fail to update by {field_name}={field_value}, reason:", e)
            return None

    async def bulk_insert(self, docs):
        success, errors = await async_bulk(self.es, docs, request_timeout=10)
        return {"success": success, "failed": len(errors), "errors": errors}

    async def close(self):
        await self.es.close()

    async def __aenter__(self):
        return self

    async def __aexit__(self, exc_type, exc_val, exc_tb):
        await self.es.close()