from typing import Optional
from ragflow_sdk import Chunk
from utils.ragflow_sdk.document_util import DocumentUtil
from .base_util import RAGFlowBaseUtil



class ChunkUtil(RAGFlowBaseUtil):

    def __init__(self, dataset_id: str, document_id: str):
        super().__init__()
        self.dataset_id = dataset_id
        self.document_id = document_id

    def add_chunk(self, dataset_name: Optional[str] = None, document_id: Optional[str] = None, content: str = None, important_keywords: list[str] = []):
        """
        添加文档分块
        """
        try:
            if not dataset_name or not document_id or not content:
                raise ValueError("数据集名称、文档ID和内容不能为空")
            chunk = DocumentUtil().get_document(dataset_name=dataset_name, document_id=document_id).add_chunk(content=content, important_keywords=important_keywords)
            return chunk
        except Exception as e:
            print(f"添加文档分块失败: {e}")
            raise e
    
    def delete_chunks(self, chunk_ids: list[str]):
        """
        删除文档分块
        """
        try:
            DocumentUtil().get_document(dataset_name=dataset_name, document_id=document_id).delete_chunks(chunk_ids)
        except Exception as e:
            print(f"删除文档分块失败: {e}")
            raise e
    

    def list_chunks(self, keywords: str = None, page: int = 1, page_size: int = 30, id : str = None) -> list[Chunk]:
        """
        列出文档分块
        """
        try:
            chunks = DocumentUtil().get_document(dataset_name=dataset_name, document_id=document_id).list_chunks(keywords=keywords, page=page, page_size=page_size, id=id)
            return chunks
        except Exception as e:
            print(f"列出文档分块失败: {e}")
            raise e

    def get_chunk(self, chunk_id: str) -> Chunk:
        """
        获取文档分块
        """
        _list = self.list_chunks(id=chunk_id)
        if len(_list) > 0:
            return _list[0]
        raise Exception("Chunk %s not found" % chunk_id)
    

    def update_chunk(self, chunk_id: str, update_message: dict):
        """
        更新文档分块
        """
        try:
            self.get_chunk(chunk_id=chunk_id).update(update_message)
        except Exception as e:
            print(f"更新文档分块失败: {e}")
            raise e
    
    def retrieve(self, question: str, dataset_ids: list[str] = None, document_ids: list[str] = None, page: int = 1, page_size: int = 30, similarity_threshold: float = 0.2, vector_similarity_weight: float = 0.3, top_k: int = 1024, rerank_id: str = None, keyword: bool = False, cross_languages: list[str] = None, metadata_condition: dict = None) -> list[Chunk]:
        """
        检索文档分块
        """
        try:
            chunks = self.ragflow_client.retrieve(question=question, dataset_ids=dataset_ids, document_ids=document_ids, page=page, page_size=page_size, similarity_threshold=similarity_threshold, vector_similarity_weight=vector_similarity_weight, top_k=top_k, rerank_id=rerank_id, keyword=keyword, cross_languages=cross_languages, metadata_condition=metadata_condition)
            return chunks
        except Exception as e:
            print(f"检索文档分块失败: {e}")
            raise e