"""
WebSocket连接管理器 — 支持 workspace 隔离
"""
from typing import Dict, Set, Optional
from fastapi import WebSocket
import json


class WebSocketManager:
    """WebSocket连接管理器（workspace 感知）"""

    def __init__(self):
        # execution_id -> Set[WebSocket]
        self.active_connections: Dict[str, Set[WebSocket]] = {}
        # websocket -> workspace_id (用于 workspace 隔离广播)
        self._ws_workspace: Dict[int, str] = {}

    async def connect(
        self, websocket: WebSocket, execution_id: str, workspace_id: Optional[str] = None
    ):
        """建立 WebSocket 连接，标记 workspace。"""
        await websocket.accept()

        if execution_id not in self.active_connections:
            self.active_connections[execution_id] = set()

        self.active_connections[execution_id].add(websocket)

        if workspace_id:
            self._ws_workspace[id(websocket)] = workspace_id

    def disconnect(self, websocket: WebSocket, execution_id: str):
        """断开 WebSocket 连接，清理 workspace 标记。"""
        self._ws_workspace.pop(id(websocket), None)

        if execution_id in self.active_connections:
            self.active_connections[execution_id].discard(websocket)

            if not self.active_connections[execution_id]:
                del self.active_connections[execution_id]

    def get_workspace_id(self, websocket: WebSocket) -> Optional[str]:
        """获取连接关联的 workspace_id。"""
        return self._ws_workspace.get(id(websocket))
    
    async def send_personal_message(self, message: dict, websocket: WebSocket):
        """
        发送个人消息
        
        Args:
            message: 消息内容
            websocket: WebSocket连接
        """
        try:
            await websocket.send_json(message)
        except Exception as e:
            print(f"发送WebSocket消息失败: {e}")
    
    async def broadcast_to_execution(self, execution_id: str, message: dict):
        """
        向特定执行的所有连接广播消息
        
        Args:
            execution_id: 执行记录ID
            message: 消息内容
        """
        if execution_id not in self.active_connections:
            return
        
        # 需要断开连接的连接
        disconnected = set()
        
        for websocket in self.active_connections[execution_id]:
            try:
                await websocket.send_json(message)
            except Exception as e:
                print(f"广播消息失败: {e}")
                disconnected.add(websocket)
        
        # 移除断开的连接
        for websocket in disconnected:
            self.disconnect(websocket, execution_id)


# 全局WebSocket管理器实例
websocket_manager = WebSocketManager()