from typing import Dict, Any, List
from langchain_core.tools import BaseTool
import requests


class WebSearchTool(BaseTool):
    """网络搜索工具（占位实现）"""
    
    name: str = "web_search"
    description: str = "Search the web for information. Input should be a search query."
    
    def _run(self, query: str) -> str:
        """搜索网络信息"""
        # 这是占位实现
        # 真实实现需接入搜索 API
        # 如 Serper、Tavily 或 Google Search API
        
        return f"""Web search functionality for query: '{query}' is not implemented. This is a placeholder. To implement real web search, you would need to:
        1. Sign up for a search API service (e.g., Serper, Tavily)
        2. Add your API key to the config/config.ini file
        3. Implement the actual search logic here"""
    
    async def _arun(self, query: str) -> str:
        """工具的异步版本"""
        return self._run(query)