from __future__ import annotations
from typing import Optional
from .virtual_gpu_device import VirtualGPUDevice

_default_device = None

def get_default_device() -> VirtualGPUDevice:
    """Get the default virtual GPU device"""
    global _default_device
    if _default_device is None:
        _default_device = VirtualGPUDevice()
    return _default_device

def get_gpu_device(device_id: Optional[int] = None) -> VirtualGPUDevice:
    """Get a specific virtual GPU device by ID"""
    if device_id is None:
        return get_default_device()
    return VirtualGPUDevice(device_id)