from typing import Dict, Any, List, Optional

class ChunkService:
    def __init__(self, http_client):
        self.http_client = http_client
    
    def create_chunk(self, dataset_id: str, document_id: str, content: str, 
                    meta_fields: Dict = None) -> Dict[str, Any]:
        endpoint = f"/api/v1/datasets/{dataset_id}/documents/{document_id}/chunks"
        
        data = {"content": content}
        if meta_fields is not None:
            data["meta_fields"] = meta_fields
        
        response = self.http_client.post(endpoint, json=data)
        
        if response.get("code") == 0 and response.get("data"):
            return response["data"]
        else:
            raise Exception(f"创建切片失败: {response.get('message', '未知错误')}")
    
    def update_chunk(self, dataset_id: str, chunk_id: str, content: str = None,
                    meta_fields: Dict = None) -> Dict[str, Any]:
        endpoint = f"/api/v1/datasets/{dataset_id}/chunks/{chunk_id}"
        
        data = {}
        if content is not None:
            data["content"] = content
        if meta_fields is not None:
            data["meta_fields"] = meta_fields
        
        response = self.http_client.post(endpoint, json=data)
        
        if response.get("code") == 0 and response.get("data"):
            return response["data"]
        else:
            raise Exception(f"更新切片失败: {response.get('message', '未知错误')}")
    
    def delete_chunk(self, dataset_id: str, chunk_id: str) -> bool:
        endpoint = f"/api/v1/datasets/{dataset_id}/chunks/{chunk_id}"
        
        response = self.http_client.post(endpoint, json={})
        
        if response.get("code") == 0:
            return True
        else:
            raise Exception(f"删除切片失败: {response.get('message', '未知错误')}")
    
    def delete_chunks(self, dataset_id: str, document_id: str, chunk_ids: List[str]) -> bool:
        endpoint = f"/api/v1/datasets/{dataset_id}/documents/{document_id}/chunks"
        
        response = self.http_client.post(endpoint, json={"chunk_ids": chunk_ids})
        
        if response.get("code") == 0:
            return True
        else:
            raise Exception(f"批量删除切片失败: {response.get('message', '未知错误')}")
    
    def retrieval(self, dataset_ids: List[str], query: str, top_k: int = 5,
                 similarity_threshold: float = 0.1, vector_similarity_weight: float = 0.3,
                 refine: bool = False) -> List[Dict[str, Any]]:
        endpoint = "/api/v1/retrieval"
        
        data = {
            "dataset_ids": dataset_ids,
            "query": query,
            "top_k": top_k,
            "similarity_threshold": similarity_threshold,
            "vector_similarity_weight": vector_similarity_weight,
            "refine": refine
        }
        
        response = self.http_client.post(endpoint, json=data)
        
        if response.get("code") == 0 and response.get("data"):
            return response["data"]
        else:
            raise Exception(f"检索失败: {response.get('message', '未知错误')}")