import asyncio
import logging
from typing import List
from fastapi import WebSocket

logger = logging.getLogger(__name__)

class ConnectionManager:
    def __init__(self):
        self.active_connections: List[WebSocket] = []
        self.loop = None  # Se registra al iniciar la app

    async def connect(self, websocket: WebSocket):
        await websocket.accept()
        self.active_connections.append(websocket)
        # Capturar el event loop principal en la primera conexión
        if self.loop is None:
            self.loop = asyncio.get_running_loop()
        logger.info(f"[WS Admin] Nueva conexión. Total activas: {len(self.active_connections)}")

    def disconnect(self, websocket: WebSocket):
        if websocket in self.active_connections:
            self.active_connections.remove(websocket)
            logger.info(f"[WS Admin] Conexión cerrada. Total activas: {len(self.active_connections)}")

    async def broadcast(self, message: dict):
        """Envía un mensaje JSON a todas las conexiones activas."""
        if not self.active_connections:
            return
            
        disconnected = []
        for connection in self.active_connections:
            try:
                await connection.send_json(message)
            except Exception as e:
                logger.warning(f"[WS Admin] Error al enviar mensaje, desconectando: {e}")
                disconnected.append(connection)
                
        for ws in disconnected:
            self.disconnect(ws)

    def broadcast_sync(self, message: dict):
        """Helper para broadcasts desde endpoints síncronos (def) de FastAPI.
        
        Los endpoints sync corren en un threadpool separado del event loop
        principal de uvicorn, por lo que usamos run_coroutine_threadsafe
        con la referencia guardada al loop principal.
        """
        if not self.active_connections:
            return
            
        if self.loop is not None and self.loop.is_running():
            asyncio.run_coroutine_threadsafe(self.broadcast(message), self.loop)
        else:
            # Fallback: intentar obtener el loop del hilo actual
            try:
                loop = asyncio.get_event_loop()
                if loop.is_running():
                    loop.create_task(self.broadcast(message))
                else:
                    loop.run_until_complete(self.broadcast(message))
            except RuntimeError:
                logger.warning("[WS Admin] No se pudo enviar broadcast: sin event loop disponible")


ws_manager = ConnectionManager()