using System;
using System.IO;
using System.Text;

namespace ZJ_BYD.Untils
{
    public class StrHelper
    {
        ///<summary>
        ///生成随机字符串 
        ///</summary>
        ///<param name="length">目标字符串的长度</param>
        ///<param name="useNum">是否包含数字，1=包含，默认为包含</param>
        ///<param name="useLow">是否包含小写字母，1=包含，默认为包含</param>
        ///<param name="useUpp">是否包含大写字母，1=包含，默认为包含</param>
        ///<param name="useSpe">是否包含特殊字符，1=包含，默认为不包含</param>
        ///<param name="custom">要包含的自定义字符，直接输入要包含的字符列表</param>
        ///<returns>指定长度的随机字符串</returns>
        public static string GetRandomString(int length, bool useNum, bool useLow, bool useUpp, bool useSpe)
        {
            byte[] b = new byte[4];
            new System.Security.Cryptography.RNGCryptoServiceProvider().GetBytes(b);
            Random r = new Random(BitConverter.ToInt32(b, 0));
            string s = null, str = "";
            if (useNum == true) { str += "0123456789"; }
            if (useLow == true) { str += "abcdefghijklmnopqrstuvwxyz"; }
            if (useUpp == true) { str += "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; }
            if (useSpe == true) { str += "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~"; }
            for (int i = 0; i < length; i++)
            {
                s += str.Substring(r.Next(0, str.Length - 1), 1);
            }
            return s;
        }

        /// <summary>
        /// 写入文本文档
        /// </summary>
        /// <param name="s"></param>
        public static bool WriteText(string path, string content)
        {
            try
            {
                FileStream fs = new FileStream(path, FileMode.Create);
                StreamWriter sw = new StreamWriter(fs);
                //开始写入
                sw.Write(content);
                //清空缓冲区
                sw.Flush();
                //关闭流
                sw.Close();
                fs.Close();
                return true;
            }
            catch (Exception ex)
            {
                LogHelper.WriteErrorLog("写入文本文件异常", ex);
                return false;
            }
        }

        /// <summary>
        /// 读取文本文档
        /// </summary>
        /// <returns></returns>
        public static string ReadText(string path)
        {
            var content = "";
            try
            {
                FileStream fileStream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
                var sw = new StreamReader(fileStream, Encoding.Default);
                while (!sw.EndOfStream)
                {
                    content = sw.ReadLine();
                }
                sw.Close();
            }
            catch (Exception ex)
            {
                LogHelper.WriteErrorLog("读取文本文件异常", ex);
                return null;
            }
            return content;
        }
    }
}