"""

真正的 MCP 客户端，用于与 Bright Data MCP 服务器通信

"""

  

import os

import json

import asyncio

import logging

from typing import List, Dict, Any, Optional

from dataclasses import dataclass

  

logger = logging.getLogger(__name__)

  

@dataclass

class SearchResult:

    """搜索结果数据类"""

    title: str

    url: str

    snippet: str

    position: int

    source: str = "brightdata_mcp"

  

class BrightDataMCPClient:

    """真正的 Bright Data MCP 客户端"""

    def __init__(self, api_token: Optional[str] = None):

        """

        初始化 MCP 客户端

        Args:

            api_token: Bright Data API Token

        """

        self.api_token = api_token or "57d1a452149d90e8e10399969cedd1c55871600e0c12ed12ef870b448f9a8c06" //这里是我的APIKEY

        self.process = None

    async def __aenter__(self):

        """异步上下文管理器入口"""

        await self.connect()

        return self

    async def __aexit__(self, exc_type, exc_val, exc_tb):

        """异步上下文管理器出口"""

        await self.disconnect()

    async def connect(self):

        """连接到 MCP 服务器"""

        try:

            env = dict(os.environ)

            env["API_TOKEN"] = self.api_token

            self.process = await asyncio.create_subprocess_exec(

                "npx", "@brightdata/mcp",

                stdin=asyncio.subprocess.PIPE,

                stdout=asyncio.subprocess.PIPE,

                stderr=asyncio.subprocess.PIPE,

                env=env

            )

            logger.info("已连接到 Bright Data MCP 服务器")

        except Exception as e:

            logger.error(f"连接 MCP 服务器失败: {e}")

            raise

    async def disconnect(self):

        """断开 MCP 服务器连接"""

        if self.process:

            self.process.terminate()

            await self.process.wait()

            logger.info("已断开 MCP 服务器连接")

    async def send_request(self, method: str, params: Dict[str, Any]) -> Dict[str, Any]:

        """发送 MCP 请求"""

        if not self.process:

            raise RuntimeError("MCP 服务器未连接")

        request = {

            "jsonrpc": "2.0",

            "id": 1,

            "method": method,

            "params": params

        }

        request_json = json.dumps(request) + "\n"

        try:

            if self.process.stdin is None:

                raise RuntimeError("进程的 stdin 不可用")

            if self.process.stdout is None:

                raise RuntimeError("进程的 stdout 不可用")

            self.process.stdin.write(request_json.encode())

            await self.process.stdin.drain()

            response_line = await self.process.stdout.readline()

            response = json.loads(response_line.decode().strip())

            if "error" in response:

                raise RuntimeError(f"MCP 错误: {response['error']}")

            return response.get("result", {})

        except Exception as e:

            logger.error(f"MCP 请求失败: {e}")

            raise

    async def search(self, query: str, num_results: int = 10, lang: str = "zh-CN") -> List[SearchResult]:

        """

        执行搜索

        Args:

            query: 搜索查询

            num_results: 结果数量

            lang: 搜索语言

        Returns:

            搜索结果列表

        """

        try:

            params = {

                "query": query,

                "num_results": min(num_results, 20),

                "language": lang,

                "country": "CN" if lang == "zh-CN" else "US"

            }

            result = await self.send_request("search", params)

            return self._parse_search_results(result)

        except Exception as e:

            logger.error(f"搜索失败: {e}")

            # 返回模拟结果作为后备

            return self._get_mock_results(query, num_results)

    def _parse_search_results(self, data: Dict[str, Any]) -> List[SearchResult]:

        """解析搜索结果"""

        results = []

        if "organic_results" in data:

            for i, item in enumerate(data["organic_results"]):

                result = SearchResult(

                    title=item.get("title", ""),

                    url=item.get("url", ""),

                    snippet=item.get("snippet", ""),

                    position=i + 1,

                    source="brightdata_mcp"

                )

                results.append(result)

        return results

    def _get_mock_results(self, query: str, num_results: int) -> List[SearchResult]:

        """获取模拟搜索结果（当 MCP 不可用时）"""

        mock_data = [

            {

                "title": f"关于 '{query}' 的搜索结果 - 百度百科",

                "url": f"https://baike.baidu.com/search?word={query}",

                "snippet": f"这是关于 {query} 的详细介绍和相关信息。包含定义、特点、应用等内容。"

            },

            {

                "title": f"{query} - 维基百科",

                "url": f"https://zh.wikipedia.org/wiki/{query}",

                "snippet": f"{query} 是一个重要的概念，在多个领域都有应用。本文详细介绍了其历史、发展和现状。"

            },

            {

                "title": f"{query} 官方网站",

                "url": f"https://www.{query.lower().replace(' ', '')}.com",

                "snippet": f"欢迎访问 {query} 官方网站，了解最新信息、产品和服务。"

            }

        ]

        results = []

        for i, item in enumerate(mock_data[:num_results]):

            result = SearchResult(

                title=item['title'],

                url=item['url'],

                snippet=item['snippet'],

                position=i + 1,

                source="mock_data"

            )

            results.append(result)

        return results

  

# 为了向后兼容，保留旧的类名

MCPGoogleSearchClient = BrightDataMCPClient

  

class MockMCPSearchClient(BrightDataMCPClient):

    """模拟 MCP 客户端，用于演示"""

    def __init__(self):

        super().__init__("mock-token")

    async def connect(self):

        """模拟连接"""

        logger.info("使用模拟 MCP 客户端")

    async def disconnect(self):

        """模拟断开连接"""

        pass

    async def search(self, query: str, num_results: int = 10, lang: str = "zh-CN") -> List[SearchResult]:

        """模拟搜索"""

        return self._get_mock_results(query, num_results)