// server/socketio.ts
import type { NextApiRequest, NextApiResponse } from 'next';
import { Server as IOServer } from 'socket.io';
import type { Server as HTTPServer } from 'http';

// TS-Hilfstypen
type NextApiResponseWithSocket = NextApiResponse & {
  socket: {
    server: HTTPServer & {
      io?: IOServer;
    };
  };
};

export default function handler(
  _req: NextApiRequest,
  res: NextApiResponseWithSocket,
) {
  if (!res.socket.server.io) {
    const io = new IOServer(res.socket.server, {
      path: '/api/socketio',
      cors: {
        origin: '*', // für lokal egal, in Produktion einschränken
      },
    });

    // global speichern, damit wir aus anderen Routen darauf zugreifen können
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    (global as any).devicesIo = io;

    io.on('connection', (socket) => {
      console.log('[Socket.IO] client connected', socket.id);

      socket.on('disconnect', () => {
        console.log('[Socket.IO] client disconnected', socket.id);
      });
    });

    res.socket.server.io = io;
    console.log('[Socket.IO] server initialized');
  } else {
    console.log('[Socket.IO] server already running');
  }

  res.end();
}