public enum DeviceTier { Potato, Low, Medium, High }

public static class DeviceGrader
{
    public static DeviceTier GetTier()
    {
#if UNITY_IOS
        // iOS 比较简单，直接通过 SystemInfo.deviceModel 判断代数
        // iPhone14,x 是 iPhone 12 系列
        string model = SystemInfo.deviceModel;
        if (model.Contains("iPhone14") || model.Contains("iPad13")) return DeviceTier.High;
        if (model.Contains("iPhone11") || model.Contains("iPhone12")) return DeviceTier.Medium;
        return DeviceTier.Low;
#elif UNITY_ANDROID
        string gpu = SystemInfo.graphicsDeviceName; // e.g., "Adreno (TM) 650"

        if (gpu.Contains("Adreno"))
        {
            int series = ExtractNumber(gpu); // 解析出 650, 512 等数字
            if (series >= 730) return DeviceTier.High;
            if (series >= 640) return DeviceTier.Medium; // 骁龙855
            if (series >= 610) return DeviceTier.Low;
            return DeviceTier.Potato;
        }
        else if (gpu.Contains("Mali"))
        {
            // Mali 命名比较乱 (G71, G72, G76, G77...)
            // 通常 G7x MPx, 数字越大越好
            if (gpu.Contains("G710") || gpu.Contains("G78")) return DeviceTier.High;
            if (gpu.Contains("G77") || gpu.Contains("G76")) return DeviceTier.Medium;
            return DeviceTier.Low;
        }

        return DeviceTier.Low; // 无法识别的默认为低
#else
        return DeviceTier.High; // PC 默认高
#endif
    }
}