"""
mcp/mcp_server.py
本地 MCP Server —— 集成 SkillRegistry，统一处理本地工具和在线 Skill 调用
"""

import json
import sys
from typing import Any

from config.settings import settings
from mcp.skill_registry import SkillRegistry
from tools.calculator import CalculatorTool
from tools.code_executor import CodeExecutorTool
from tools.file_reader import FileReaderTool
from tools.ssh_docker import SSHDockerTool
from tools.static_analyzer import StaticAnalyzerTool
from tools.web_search import WebSearchTool
from utils.logger import get_logger

logger = get_logger("MCP.Server")

# 本地工具类映射表
_LOCAL_TOOL_CLASSES: dict[str, type] = {
    "calculator":      CalculatorTool,
    "web_search":      WebSearchTool,
    "file_reader":     FileReaderTool,
    "code_executor":   CodeExecutorTool,
    "static_analyzer": StaticAnalyzerTool,
    "ssh_docker":      SSHDockerTool,
}


class MCPServer:
    """
    本地 MCP Server

    启动流程:
        1. 根据 config.yaml mcp.enabled_tools 实例化本地工具
        2. 通过 SkillRegistry 注册本地工具
        3. 连接 config.yaml mcp_skills 中所有 enabled 的在线 MCP Skill
        4. 进入请求处理循环（stdio 模式）
    """

    def __init__(self):
        self.registry = SkillRegistry()
        self._setup()

    def _setup(self) -> None:
        """初始化：注册本地工具 + 连接在线 Skill"""
        # ── 注册本地工具 ──────────────────────────────────────
        enabled = settings.mcp.enabled_tools
        logger.info(f"🔧 注册本地工具: {enabled}")
        for tool_name in enabled:
            cls = _LOCAL_TOOL_CLASSES.get(tool_name)
            if cls:
                self.registry.register_local(cls())
            else:
                logger.warning(f"⚠️  未知工具: {tool_name}，跳过")

        # ── 连接在线 MCP Skill ────────────────────────────────
        skill_map = self.registry.connect_skills()
        if skill_map:
            logger.info(
                "🌐 在线 Skill 注册汇总:\n" +
                "\n".join(
                    f"   [{name}]: {tools}"
                    for name, tools in skill_map.items()
                )
            )

        # ── 打印工具总览 ──────────────────────────────────────
        all_tools = self.registry.list_all_tools()
        logger.info(
            f"📦 工具总览（共 {len(all_tools)} 个）:\n" +
            "\n".join(
                f"   {'🔵' if t['source'] == 'local' else '🟢'} "
                f"[{t['source']:20s}] {t['name']}: {t['description']}"
                for t in all_tools
            )
        )

    # ── 请求处理 ──────────────────────────────────────────────

    def handle_request(self, request: dict) -> dict:
        """
        处理单条 JSON-RPC 请求

        支持的 method:
            initialize      → 握手
            tools/list      → 返回所有工具 schema
            tools/call      → 调用工具（自动路由本地/远端）
            ping            → 心跳
        """
        method = request.get("method", "")
        req_id = request.get("id")
        params = request.get("params", {})

        logger.debug(f"📨 收到请求: method={method}  id={req_id}")

        try:
            match method:
                case "initialize":
                    result = self._handle_initialize(params)
                case "tools/list":
                    result = self._handle_list_tools()
                case "tools/call":
                    result = self._handle_call_tool(params)
                case "ping":
                    result = {}
                case _:
                    return self._error_response(
                        req_id, -32601, f"Method not found: {method}"
                    )
            return {"jsonrpc": "2.0", "id": req_id, "result": result}

        except Exception as e:
            logger.error(f"❌ 处理请求异常: {e}")
            return self._error_response(req_id, -32603, str(e))

    def _handle_initialize(self, params: dict) -> dict:
        client_info = params.get("clientInfo", {})
        logger.info(
            f"🤝 MCP 握手\n"
            f"   客户端: {client_info.get('name', 'unknown')} "
            f"v{client_info.get('version', '?')}\n"
            f"   协议版本: {params.get('protocolVersion', 'unknown')}"
        )
        return {
            "protocolVersion": "2024-11-05",
            "capabilities":    {"tools": {"listChanged": False}},
            "serverInfo": {
                "name":    settings.mcp.server_name,
                "version": "1.0.0",
            },
        }

    def _handle_list_tools(self) -> dict:
        schemas = self.registry.get_all_schemas()
        logger.debug(f"📋 tools/list → {len(schemas)} 个工具")
        return {"tools": schemas}

    def _handle_call_tool(self, params: dict) -> dict:
        tool_name = params.get("name", "")
        arguments = params.get("arguments", {})

        if not tool_name:
            raise ValueError("tools/call 缺少 name 参数")

        result = self.registry.dispatch(tool_name, arguments)
        logger.info(
            f"{'✅' if result.success else '❌'} "
            f"tools/call [{result.source}] {tool_name}  "
            f"耗时={result.elapsed_sec:.2f}s"
        )

        if not result.success:
            raise RuntimeError(result.error)

        return {
            "content": [{"type": "text", "text": result.content}]
        }

    @staticmethod
    def _error_response(req_id: Any, code: int, message: str) -> dict:
        return {
            "jsonrpc": "2.0",
            "id":      req_id,
            "error":   {"code": code, "message": message},
        }

    # ── stdio 运行模式 ────────────────────────────────────────

    def run_stdio(self) -> None:
        """
        stdio 模式主循环
        从 stdin 逐行读取 JSON-RPC 请求，向 stdout 写入响应
        """
        logger.info(
            f"🚀 {settings.mcp.server_name} 已启动（stdio 模式）\n"
            f"{settings.display()}"
        )
        try:
            for line in sys.stdin:
                line = line.strip()
                if not line:
                    continue
                try:
                    request  = json.loads(line)
                    response = self.handle_request(request)
                    print(json.dumps(response, ensure_ascii=False), flush=True)
                except json.JSONDecodeError as e:
                    err = self._error_response(None, -32700, f"Parse error: {e}")
                    print(json.dumps(err, ensure_ascii=False), flush=True)
        except KeyboardInterrupt:
            logger.info("⏹  收到中断信号，正在关闭...")
        finally:
            self.registry.close()
            logger.info("👋 MCP Server 已关闭")

    def close(self) -> None:
        self.registry.close()

    def __enter__(self):
        return self

    def __exit__(self, *_):
        self.close()


# ── 入口 ──────────────────────────────────────────────────────
if __name__ == "__main__":
    with MCPServer() as server:
        server.run_stdio()