namespace AI.Utils
{
    /// <summary>
    /// 文件工具类
    /// </summary>
    public static class FileUnit
    {
        private static readonly string[] SizeUnits =
            ["B", "KB", "MB", "GB", "TB", "PB"];

        /// <summary>
        /// 格式化字节数为更易读的字符串格式
        /// </summary>
        /// <param name="bytes">字符数</param>
        /// <returns>易读的字符串格式</returns>
        public static string FormatFileSize(long bytes)
        {
            int unitIndex = 0;
            decimal size = bytes;

            // 主要是防止 UI 层可能没有做校验这些
            if (size < 0)
            {
                return "0 B";
            }

            while (size >= 1024 && unitIndex < SizeUnits.Length - 1)
            {
                size /= 1024;
                unitIndex++;
            }

            return $"{size:F1} {SizeUnits[unitIndex]}";
        }
    }
}