using System;
using System.Collections.Generic;
using System.IO;
using PEIS.Common.Helper.Nlog;

namespace PEIS.Common.Helper.File
{
    public class FileHelper
    {
        /// <summary>
        /// 创建文件夹
        /// </summary>
        /// <param name="file"></param>
        public static void CreateFile(string file)
        {
            if (Directory.Exists(file))
                //文件夹已经存在
                return;

            try
            {
                Directory.CreateDirectory(file);
                //创建成功
            }
            catch (Exception e)
            {
                LogHelper.Log.Error($"文件创建出错:{e.ToString()}");
            }

        }

        /// <summary>
        /// 获取文件大小
        /// </summary>
        /// <param name="length">文件长度</param>
        /// <returns></returns>
        public static string FileSize(long length)
        {
            var unit = new List<string>() { "K", "M", "G" };
            var size = Math.Round(length / 1024.0, 2);
            var index = 0;
            while (size > 1024 && index < 2)
            {
                index++;
                size = Math.Round(size / 1024, 2);
            }

            return $"{size}{unit[index]}";

        }
    }
}