using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
namespace ViewModels
{
    public class Tools
    {
        private static byte[] Keys = { 0xEF, 0xAB, 0x56, 0x78, 0x90, 0x34, 0xCD, 0x12 };

        public static string encryptKey = "20su#pe1r%boolive";
        /// <summary>
        /// DES加密字符串
        /// </summary>
        /// <param name="encryptString">待加密的字符串</param>
        /// <param name="encryptKey">加密密钥,要求为8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 EncryptString(string encryptString)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                var dCSP = new DESCryptoServiceProvider();
                using MemoryStream mStream = new MemoryStream();
                using 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
            {
                return encryptString;
            }
        }

        /// <summary>
        /// DES解密字符串
        /// </summary>
        /// <param name="decryptString">待解密的字符串</param>
        /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
        /// <returns>解密成功返回解密后的字符串，失败返源串</returns>
        public static string DecryptString(string decryptString)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Convert.FromBase64String(decryptString);
                var DCSP = new DESCryptoServiceProvider();
                using MemoryStream mStream = new MemoryStream();
                using 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;
            }
        }


        public static string HashPassword(string pwd)
        {
            string v = CryptoHelper.Crypto.HashPassword(pwd);
            return v;
        }
        public static bool VerifyHashedPassword(string encrypwd, string original_pwd)
        {
            bool v = CryptoHelper.Crypto.VerifyHashedPassword(encrypwd, original_pwd);
            return v;
        }



        /// <summary>
        ///  时间戳转本地时间-时间戳精确到秒
        /// </summary> 
        public static DateTime ToLocalTimeDateBySeconds(long unix)
        {
            var dto = DateTimeOffset.FromUnixTimeSeconds(unix);
            return dto.ToLocalTime().DateTime;
        }

        /// <summary>
        ///  时间转时间戳Unix-时间戳精确到秒
        /// </summary> 
        public static long ToUnixTimestampBySeconds(DateTime dt)
        {
            DateTimeOffset dto = new DateTimeOffset(dt);
            return dto.ToUnixTimeSeconds();
        }


        /// <summary>
        ///  时间戳转本地时间-时间戳精确到毫秒
        /// </summary> 
        public static DateTime ToLocalTimeDateByMilliseconds(long unix)
        {
            var dto = DateTimeOffset.FromUnixTimeMilliseconds(unix);
            return dto.ToLocalTime().DateTime;
        }

        /// <summary>
        ///  时间转时间戳Unix-时间戳精确到毫秒
        /// </summary> 
        public static long ToUnixTimestampByMilliseconds(DateTime dt)
        {
            DateTimeOffset dto = new DateTimeOffset(dt);
            return dto.ToUnixTimeMilliseconds();
        }
    }
}