using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Myshipping.Core
{
    public static class StringExtentions
    {
        /// <summary>
        /// 处理文件名称
        /// </summary>
        /// <param name="fn">文件名</param>
        /// <returns>返回合法的文件名</returns>
        public static string ValidFileName(this string fn)
        {
            char[] strs = "+#?*\"<>/;,-:%~".ToCharArray();
            foreach (char c in strs)
                fn = fn.Replace(c.ToString(), "_");

            strs = "：，。；？".ToCharArray();
            foreach (char c in strs)
                fn = fn.Replace(c.ToString(), "_");

            //去掉空格.
            while (fn.Contains(" ") == true)
                fn = fn.Replace(" ", "");

            //替换特殊字符.
            fn = fn.Replace("\t\n", "");

            //处理合法的文件名.
            StringBuilder rBuilder = new StringBuilder(fn);
            foreach (char rInvalidChar in Path.GetInvalidFileNameChars())
                rBuilder.Replace(rInvalidChar.ToString(), string.Empty);

            fn = rBuilder.ToString();

            fn = fn.Replace("__", "_");
            fn = fn.Replace("__", "_");
            fn = fn.Replace("__", "_");
            fn = fn.Replace("__", "_");
            fn = fn.Replace("__", "_");
            fn = fn.Replace("__", "_");
            fn = fn.Replace("__", "_");
            fn = fn.Replace("__", "_");
            fn = fn.Replace(" ", "");
            fn = fn.Replace(" ", "");
            fn = fn.Replace(" ", "");
            fn = fn.Replace(" ", "");
            fn = fn.Replace(" ", "");
            fn = fn.Replace(" ", "");
            fn = fn.Replace(" ", "");
            fn = fn.Replace(" ", "");

            if (fn.Length > 240)
                fn = fn.Substring(0, 240);

            return fn;
        }
    }
}