"""
Elasticsearch 文档管理
"""
from typing import List, Dict, Any, Optional
from elasticsearch.helpers import bulk, BulkIndexError
from elasticsearch.exceptions import NotFoundError
from utils.es.base import ESConnection


class DocumentManager:
    """
    Elasticsearch 文档管理器
    负责：
    - 文档插入（单条和批量）
    - 文档更新
    - 文档删除（单条和批量）
    - 文档获取
    """
    
    def __init__(self, es_connection: Optional[ESConnection] = None):
        """
        初始化文档管理器
        
        Args:
            es_connection: ES 连接实例，可选
        """
        self.es_conn = es_connection or ESConnection()
        self.es = self.es_conn.get_client()
    
    def insert(self, index_name: str, document: Dict[str, Any], id: str = None, refresh: bool = False) -> bool:
        """
        插入单个文档
        
        Args:
            index_name: 索引名称
            document: 文档内容
            id: 文档ID，可选
            refresh: 是否立即刷新
        
        Returns:
            bool: 插入是否成功
        """
        try:
            self.es.index(index=index_name, body=document, id=id, refresh=refresh)
            return True
        except Exception as e:
            print(f"插入文档失败: {e}")
            return False
    
    def bulk_insert(self, index_name: str, documents: List[Dict[str, Any]], refresh: bool = False) -> Dict[str, Any]:
        """
        批量插入文档
        
        Args:
            index_name: 索引名称
            documents: 文档列表，每个文档可以包含"_id"字段指定ID
            refresh: 是否立即刷新
        
        Returns:
            Dict: 包含成功和失败信息的字典
        """
        try:
            # 准备批量操作
            actions = []
            for doc in documents:
                action = {
                    "_index": index_name,
                    "_source": doc.copy()
                }
                # 如果文档包含"_id"字段，将其作为文档ID
                if "_id" in doc:
                    action["_id"] = doc["_id"]
                    del action["_source"]["_id"]
                actions.append(action)
            
            # 执行批量操作
            success, failed = bulk(self.es, actions, refresh=refresh, stats_only=False)
            
            return {
                "success": success,
                "failed": len(failed) if failed else 0,
                "errors": failed if failed else []
            }
        except BulkIndexError as e:
            print(f"批量插入失败: {e}")
            return {
                "success": 0,
                "failed": len(e.errors),
                "errors": e.errors
            }
        except Exception as e:
            print(f"批量插入失败: {e}")
            return {
                "success": 0,
                "failed": len(documents),
                "errors": [str(e)] * len(documents)
            }
    
    def update(self, index_name: str, id: str, update_body: Dict[str, Any], refresh: bool = False) -> bool:
        """
        更新文档
        
        Args:
            index_name: 索引名称
            id: 文档ID
            update_body: 更新内容，格式如 {"doc": {"field": "value"}}
            refresh: 是否立即刷新
        
        Returns:
            bool: 更新是否成功
        """
        try:
            self.es.update(index=index_name, id=id, body=update_body, refresh=refresh)
            return True
        except NotFoundError:
            print(f"文档不存在: {id}")
            return False
        except Exception as e:
            print(f"更新文档失败: {e}")
            return False
    
    def delete(self, index_name: str, id: str, refresh: bool = False) -> bool:
        """
        删除单个文档
        
        Args:
            index_name: 索引名称
            id: 文档ID
            refresh: 是否立即刷新
        
        Returns:
            bool: 删除是否成功
        """
        try:
            self.es.delete(index=index_name, id=id, refresh=refresh)
            return True
        except NotFoundError:
            print(f"文档不存在: {id}")
            return False
        except Exception as e:
            print(f"删除文档失败: {e}")
            return False
    
    def delete_by_query(self, index_name: str, query: Dict[str, Any], refresh: bool = False) -> Dict[str, Any]:
        """
        按查询条件删除文档
        
        Args:
            index_name: 索引名称
            query: 查询条件
            refresh: 是否立即刷新
        
        Returns:
            Dict: 删除结果
        """
        try:
            result = self.es.delete_by_query(index=index_name, body={"query": query}, refresh=refresh)
            return {
                "deleted": result["deleted"],
                "failed": 0
            }
        except Exception as e:
            print(f"按条件删除失败: {e}")
            return {
                "deleted": 0,
                "failed": 1,
                "error": str(e)
            }
    
    def get(self, index_name: str, id: str, fields: List[str] = None) -> Optional[Dict[str, Any]]:
        """
        获取单个文档
        
        Args:
            index_name: 索引名称
            id: 文档ID
            fields: 要返回的字段列表，可选
        
        Returns:
            Dict: 文档内容，不存在则返回None
        """
        try:
            params = {}
            if fields:
                params["_source"] = fields
            result = self.es.get(index=index_name, id=id, **params)
            return result["_source"]
        except NotFoundError:
            return None
        except Exception as e:
            print(f"获取文档失败: {e}")
            return None