const resolveChatSocketUrl = (raw?: string): string => {
  if (!raw) return 'http://localhost:3000'

  const trimmed = raw.replace(/\/+$/, '')

  if (trimmed.endsWith('/api/v1')) {
    return trimmed.slice(0, -'/api/v1'.length)
  }

  return trimmed
}

export const CHAT_SOCKET_URL = resolveChatSocketUrl(process.env.NEXT_PUBLIC_API_URL)
/** Socket.IO namespace (logical channel). */
export const CHAT_SOCKET_NAMESPACE = '/chat'
/** Engine.IO transport path — appears as `wss://host/chat/...` (not `/socket.io`). */
export const CHAT_SOCKET_PATH = '/chat'