"""
Elasticsearch 索引管理
"""
from typing import Dict, Any, Optional
from utils.es.base import ESConnection


class IndexManager:
    """
    Elasticsearch 索引管理器
    负责：
    - 索引创建
    - 索引删除
    - 索引检查
    """
    
    def __init__(self, es_connection: Optional[ESConnection] = None):
        """
        初始化索引管理器
        
        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 create_index(self, index_name: str, mappings: Dict[str, Any] = None, settings: Dict[str, Any] = None) -> bool:
        """
        创建索引
        
        Args:
            index_name: 索引名称
            mappings: 自定义映射，会与动态模板合并
            settings: 索引设置
        
        Returns:
            bool: 创建是否成功
        """
        try:
            # 如果索引已存在，返回True
            if self.es.indices.exists(index=index_name):
                return True
            
            # 合并动态模板和自定义映射
            final_mappings = self.es_conn.dynamic_templates.copy()
            if mappings:
                if "dynamic_templates" in mappings:
                    final_mappings["dynamic_templates"] += mappings["dynamic_templates"]
                if "properties" in mappings:
                    final_mappings["properties"] = mappings["properties"]
            
            body = {}
            if settings:
                body["settings"] = settings
            body["mappings"] = final_mappings
            
            self.es.indices.create(index=index_name, body=body)
            return True
        except Exception as e:
            print(f"创建索引失败: {e}")
            return False
    
    def delete_index(self, index_name: str) -> bool:
        """
        删除索引
        
        Args:
            index_name: 索引名称
        
        Returns:
            bool: 删除是否成功
        """
        try:
            if self.es.indices.exists(index=index_name):
                self.es.indices.delete(index=index_name)
            return True
        except Exception as e:
            print(f"删除索引失败: {e}")
            return False
    
    def exists(self, index_name: str) -> bool:
        """
        检查索引是否存在
        
        Args:
            index_name: 索引名称
        
        Returns:
            bool: 索引是否存在
        """
        try:
            return self.es.indices.exists(index=index_name)
        except Exception as e:
            print(f"检查索引存在失败: {e}")
            return False
    
    def get_mappings(self, index_name: str) -> Optional[Dict[str, Any]]:
        """
        获取索引映射
        
        Args:
            index_name: 索引名称
        
        Returns:
            Dict[str, Any]: 索引映射，不存在则返回None
        """
        try:
            if self.exists(index_name):
                return self.es.indices.get_mapping(index=index_name)
            return None
        except Exception as e:
            print(f"获取索引映射失败: {e}")
            return None
    
    def get_settings(self, index_name: str) -> Optional[Dict[str, Any]]:
        """
        获取索引设置
        
        Args:
            index_name: 索引名称
        
        Returns:
            Dict[str, Any]: 索引设置，不存在则返回None
        """
        try:
            if self.exists(index_name):
                return self.es.indices.get_settings(index=index_name)
            return None
        except Exception as e:
            print(f"获取索引设置失败: {e}")
            return None