using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using Newtonsoft.Json;
namespace DSWeb.Common
{
    /// <summary>
    /// string 拓展
    /// </summary>
   public static class StringExtension
    {


        /// <summary>
        /// 隐藏中间字符串
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string GetHideCentre(this string str)
        {
            if (str.Length > 8)
            {

                return string.Format("{0}***{1}", str.Substring(0, 4), str.Substring(str.Length - 4, 4));
            }
            else if (str.Length > 5)
            {
                return string.Format("{0}***{1}", str.Substring(0, 2), str.Substring(str.Length - 2, 2));

            }
            else if (str.Length > 4)
            {
                return string.Format("{0}***{1}", str.Substring(0, 1), str.Substring(str.Length - 1, 1));

            }
            else
            {
                return GetHideHead(str);
            }
        }

        /// <summary>
        /// 隐藏头部
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string GetHideHead(this string str)
        {
            var length = 1;
            length = length > str.Length ? str.Length : length;
            if (str.Length < 4)
            {
                length = 1;
                if (str.Length == 1)
                {
                    return str;
                }

                return "**" + str.Substring(str.Length - length, length);
            }
            length = 4;
            return "****" + str.Substring(str.Length - length, length);


        }

        /// <summary>
        /// 用于判断是否为空字符
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static bool IsNull(this string s)
        {
            return s == null || (s.Trim().Length == 0);
        }

        /// <summary>
        /// 用于判断是否为非空字符
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static bool IsNotNull(this string s)
        {
            return !s.IsNull();
        }

        #region 加密算法


        /// <summary>  
        /// DES对称加密字符串  
        /// </summary>  
        /// <param name="encryptString">待加密的字符串</param>  
        /// <param name="key">加密密钥,要求为16位</param>  
        /// <returns>加密成功返回加密后的字符串，失败返回源串</returns>  
        public static string DESEncrypt(this string encryptString, string key)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(key);
                //用于对称算法的初始化向量（默认值）。  
                byte[] rgbIV = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F };
                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                Aes dCSP = Aes.Create();

                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Convert.ToBase64String(mStream.ToArray());
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>  
        /// DES对称解密字符串  
        /// </summary>  
        /// <param name="decryptString">待解密的字符串</param>  
        /// <param name="key">解密密钥，要求16位</param>  
        /// <returns></returns>  
        public static string DESDecrypt(this string decryptString, string key)
        {
            try
            {
                //用于对称算法的初始化向量（默认值）  
                byte[] Keys = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F };
                byte[] rgbKey = Encoding.UTF8.GetBytes(key);
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Convert.FromBase64String(decryptString);
                Aes DCSP = Aes.Create();

                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch
            {
                return decryptString;
            }
        }

        /// <summary>
        /// 将字符串转换成MD5加密字符串
        /// </summary>
        /// <param name="orgStr"></param>
        /// <returns></returns>
        public static string ToMd5(this string orgStr)
        {
            using (var md5 = MD5.Create())
            {
                var encoding = Encoding.UTF8;
                var encryptedBytes = md5.ComputeHash(encoding.GetBytes(orgStr));
                var sb = new StringBuilder(32);
                foreach (var bt in encryptedBytes)
                {
                    sb.Append(bt.ToString("x").PadLeft(2, '0'));
                }
                return sb.ToString().ToLower();
            }
        }
        #endregion
        /// <summary>
        /// 获取扩展名
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static string GetExt(this string s)
        {
            var ret = string.Empty;
            if (!s.Contains('.')) return ret;
            var temp = s.Split('.');
            ret = temp[temp.Length - 1];

            return ret;
        }
        /// <summary>
        /// 验证QQ格式
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static bool IsQq(this string s)
        {
            return s.IsNull() || Regex.IsMatch(s, @"^[1-9]\d{4,15}$");
        }

        /// <summary>
        /// 将字符串根据分隔符转换我List<string>
        /// </summary>
        /// <param name="str"></param>
        /// <param name="split">分隔符</param>
        /// <returns></returns>
        public static List<string> ToListString(this string str, char split)
        {
            return new List<string>(str.Split(split));

        }

        /// <summary>
        /// 判断是否为有效的Email地址
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static bool IsEmail(this string s)
        {
            if (!s.IsNull())
            {
                //return Regex.IsMatch(s,
                //         @"^(?("")("".+?""@)|(([0-9a-zA-Z]((\.(?!\.))|[-!#\$%&'\*\+/=\?\^`\{\}\|~\w])*)(?<=[0-9a-zA-Z])@))" +
                //         @"(?(\[)(\[(\d{1,3}\.){3}\d{1,3}\])|(([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,6}))$");
                const string pattern = @"^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$";
                return Regex.IsMatch(s, pattern);
            }
            return false;
        }
        /// <summary>
        /// 判断是否是url
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static bool IsUrl(this string s)
        {
            if (!s.IsNull())
            {
                const string pattern = @"^(http://|https://)?((?:[A-Za-z0-9]+-[A-Za-z0-9]+|[A-Za-z0-9]+)\.)+([A-Za-z]+)[/\?\:]?.*$";
                return Regex.IsMatch(s, pattern);
            }
            return false;
        }

        /// <summary>
        /// 验证是否是合法的电话号码
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static bool IsPhone(this string s)
        {
            if (!s.IsNull())
            {
                return Regex.IsMatch(s, @"^\+?((\d{2,4}(-)?)|(\(\d{2,4}\)))*(\d{0,16})*$");
            }
            return true;
        }

        /// <summary>
        /// 验证是否是合法的手机号码
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static bool IsMobile(this string s)
        {
            if (!s.IsNull())
            {
                return Regex.IsMatch(s, @"^\+?\d{0,4}?[1][3-8]\d{9}$");
            }
            return false;
        }

        /// <summary>
        /// 验证是否是合法的邮编
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static bool IsZipCode(this string s)
        {
            if (!s.IsNull())
            {
                return Regex.IsMatch(s, @"[1-9]\d{5}(?!\d)");
            }
            return true;
        }

        /// <summary>
        /// 验证是否是合法的传真
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static bool IsFax(this string s)
        {
            if (!s.IsNull())
            {
                return Regex.IsMatch(s, @"(^[0-9]{3,4}\-[0-9]{7,8}$)|(^[0-9]{7,8}$)|(^\([0-9]{3,4}\)[0-9]{3,8}$)|(^0{0,1}13[0-9]{9}$)");
            }
            return true;
        }

        /// <summary>
        /// 检查字符串是否为有效的int数字
        /// </summary>
        /// <param name="val"></param>
        /// <returns></returns>
        public static bool Isint(this string val)
        {
            if (IsNull(val))
                return false;
            int k;
            return int.TryParse(val, out k);
        }

        /// <summary>
        /// 字符串转数字，未转换成功返回0
        /// </summary>
        /// <param name="val"></param>
        /// <returns></returns>
        public static int ToInt(this string val)
        {

            if (IsNull(val))
                return 0;
            int k;
            return int.TryParse(val, out k) ? k : 0;
        }

        /// <summary>
        /// 将int间隔字符串抓换为list<int>
        /// </summary>
        /// <param name="str"></param>
        /// <param name="Split"></param>
        /// <returns></returns>
        public static List<int> ToIntList(this string str, char Split = ',')
        {
            return str.Split(Split).strToIntArray().ToList();
        }
       
        /// <summary>
        /// 判断是否是json字符串
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static bool IsJson(this string str)
        {
            try
            {
                if (str.IsNull())
                    return false;

                JsonConvert.DeserializeObject(str);
                return true;
            }
            catch
            {
                return false;
            }
        }

        /// <summary>
        /// 检查字符串是否为有效的INT64数字
        /// </summary>
        /// <param name="val"></param>
        /// <returns></returns>
        public static bool IsInt64(this string val)
        {
            if (IsNull(val))
                return false;
            long k;
            return long.TryParse(val, out k);
        }

        /// <summary>
        /// 验证是否是身份证
        /// </summary>
        /// <param name="ID"></param>
        /// <returns></returns>
        public static bool IsCardId(this string ID)
        {
            var r = false;
            if (IsNull(ID))
                r = false;
            if (ID.Length == 15)
            {

                var date = $"19{ID.Substring(6, 2)}-{ID.Substring(8, 2)}-{ID.Substring(10, 2)}";
                DateTime dt;
                return DateTime.TryParse(date, out dt);
            }
            else if (ID.Length == 18)
            {
                var date = $"{ID.Substring(6, 4)}-{ID.Substring(10, 2)}-{ID.Substring(12, 2)}";
                DateTime dt;
                return DateTime.TryParse(date, out dt);
            }
            else { r = false; }

            return r;
        }

        /// <summary>
        /// 检查字符串是否为有效的double
        /// </summary>
        /// <param name="val"></param>
        /// <returns></returns>
        public static bool IsDecimal(this string val)
        {
            if (IsNull(val))
                return false;
            double d;
            return double.TryParse(val, out d);
        }

        /// <summary>
        ///检测字符串是否是时间类型
        /// </summary>
        /// <param name="val"></param>
        /// <returns></returns>
        public static bool IsDateTime(this string val)
        {
            if (IsNull(val))
                return false;
            DateTime d;
            return DateTime.TryParse(val, out d);
        }
        /// <summary>
        /// 字符串转时间 非时间返回空
        /// </summary>
        /// <param name="val"></param>
        /// <returns></returns>
        public static DateTime? ToDateTime(this string val)
        {
            if (val.IsDateTime())
            {
                return DateTime.Parse(val);
            }
            else
            {
                return null;
            }
        }
        /// <summary>
        /// 将时间类型字符转时间戳
        /// </summary>
        /// <param name="Val"></param>
        /// <returns></returns>
        public static long ToTimestamp(this string Val)
        {
            var time = Val.ToDateTime();
            return time != null ? ((DateTime)time).ToTimeStamp() : 0;
        }

        /// <summary>
        /// 从左边截取N个字符
        /// </summary>
        /// <param name="val"></param>
        /// <returns></returns>
        public static string GetLeftStr(this string val, int count = 0)
        {
            if (count > val.Length)
                return null;

            return val.Substring(0, count);
        }

        /// <summary>
        ///从右边截取N个字符
        /// </summary>
        /// <param name="val"></param>
        /// <param name="count"></param>
        /// <returns></returns>
        public static string GetRightStr(this string val, int count = 0)
        {

            if (count > val.Length)
                return null;

            return val.Substring(val.Length - count, count);

        }


    }
}