"""
use neo4j to build graph
"""

from dataclasses import fields

from applications.utils.neo4j import AsyncNeo4jRepository
from applications.utils.neo4j import Document, GraphChunk, ChunkRelations
from applications.utils.mysql import ContentChunks


class BuildGraph(AsyncNeo4jRepository):
    INIT_STATUS = 0
    PROCESSING_STATUS = 1
    FINISHED_STATUS = 2
    FAILED_STATUS = 3

    def __init__(self, neo4j, es_client, mysql_client):
        super().__init__(neo4j)
        self.es_client = es_client
        self.chunk_manager = ContentChunks(mysql_client)

    @staticmethod
    def from_dict(cls, data: dict):
        field_names = {f.name for f in fields(cls)}
        return cls(**{k: v for k, v in data.items() if k in field_names})

    async def add_single_chunk(self, param):
        """async process single chunk"""
        chunk_id = param["chunk_id"]
        doc_id = param["doc_id"]
        acquire_lock = await self.chunk_manager.update_graph_status(
            doc_id, chunk_id, self.INIT_STATUS, self.PROCESSING_STATUS
        )
        if not acquire_lock:
            print(f"while building graph, acquire lock for chunk {chunk_id}")
            return

        try:
            doc: Document = self.from_dict(Document, param)
            graph_chunk: GraphChunk = self.from_dict(GraphChunk, param)
            relations: ChunkRelations = self.from_dict(ChunkRelations, param)

            await self.add_document_with_chunk(doc, graph_chunk, relations)
            await self.chunk_manager.update_graph_status(
                doc_id, chunk_id, self.PROCESSING_STATUS, self.FINISHED_STATUS
            )
        except Exception as e:
            print(f"failed to build graph for chunk {chunk_id}: {e}")
            await self.chunk_manager.update_graph_status(
                doc_id, chunk_id, self.PROCESSING_STATUS, self.FAILED_STATUS
            )

    async def get_chunk_list_from_es(self, doc_id):
        """async get chunk list"""
        query = {
            "query": {"bool": {"must": [{"term": {"doc_id": doc_id}}]}},
            "_source": True,
        }
        try:
            resp = await self.es_client.async_search(query=query)
            return [hit["_source"] for hit in resp["hits"]["hits"]]
        except Exception as e:
            print(f"search failed: {e}")
            return []

    async def deal(self, doc_id):
        """async process single chunk"""
        chunk_list = await self.get_chunk_list_from_es(doc_id)
        for chunk in chunk_list:
            await self.add_single_chunk(chunk)

    async def deal_batch(self, dataset_id):
        """async task"""
        doc_ids = await self.chunk_manager.get_ungraphed_docs(dataset_id)
        for doc_id in doc_ids:
            try:
                await self.deal(doc_id)
            except Exception as e:
                print(f"failed to build graph for doc {doc_id}: {e}")