let capabilityPromise;

export function detectWebGpuCapability() {
  capabilityPromise ??= detect();
  return capabilityPromise;
}

async function detect() {
  if (!navigator.gpu) {
    return { available: false, label: "CPU fallback", detail: "WebGPU API 없음" };
  }
  try {
    const adapter = await navigator.gpu.requestAdapter({ powerPreference: "high-performance" });
    if (!adapter) {
      return { available: false, label: "CPU fallback", detail: "WebGPU adapter 없음" };
    }
    const info = adapter.info;
    const adapterName = [info?.vendor, info?.architecture || info?.device]
      .filter(Boolean)
      .join(" · ");
    return {
      available: true,
      label: adapterName ? `WebGPU · ${adapterName}` : "WebGPU adapter 준비됨",
      detail: adapterName || "WebGPU adapter 준비됨",
    };
  } catch (error) {
    return {
      available: false,
      label: "CPU fallback",
      detail: error instanceof Error ? error.message : String(error),
    };
  }
}