import logging
from typing import List
from fastapi import WebSocket, WebSocketDisconnect

logger = logging.getLogger(__name__)

class ConnectionManager:
    def __init__(self):
        # 활성화된 웹소켓 커넥션 목록 관리
        self.active_connections: List[WebSocket] = []
    
    async def connect(self, websocket: WebSocket):
        await websocket.accept()
        self.active_connections.append(websocket)
        logger.info(f"[WS] Client connected. Total active connections: {len(self.active_connections)}")

    def disconnect(self, websocket: WebSocket):
        if websocket in self.active_connections:
            self.active_connections.remove(websocket)
            logger.info(f"[WS] Client disconnected. Total active connections: {len(self.active_connections)}")

    async def broadcast(self, message: dict):
        """
        접속한 모든 웹 브라우저 클라이언트에게 JSON 데이터를 전송합니다.
        """
        if not self.active_connections:
            return
            
        logger.debug(f"[WS BROADCAST] Broadcasting message to {len(self.active_connections)} clients.")
        disconnected_clients = []
        for connection in self.active_connections:
            try:
                await connection.send_json(message)
            except Exception as e:
                logger.warning(f"[WS BROADCAST] Failed to send message to client, marked for cleanup: {e}")
                disconnected_clients.append(connection)
                
        # 오류가 난 비정상 커넥션 정리
        for conn in disconnected_clients:
            self.disconnect(conn)

# 전역 싱글톤 매니저 인스턴스
ws_manager = ConnectionManager()