from fastapi import WebSocket, WebSocketDisconnect
from typing import Dict, Set
import json
import asyncio

class CollaborationManager:
    def __init__(self):
        self.active_connections: Dict[str, Set[WebSocket]] = {}
        
    async def connect(self, session_id: str, websocket: WebSocket):
        await websocket.accept()
        if session_id not in self.active_connections:
            self.active_connections[session_id] = set()
        self.active_connections[session_id].add(websocket)
        
    async def disconnect(self, session_id: str, websocket: WebSocket):
        self.active_connections[session_id].remove(websocket)
        
    async def broadcast(self, session_id: str, message: dict):
        if session_id in self.active_connections:
            for connection in self.active_connections[session_id]:
                await connection.send_json(message)

collaboration_manager = CollaborationManager()