using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.Xml;
using System.Configuration;
using System.IO;

namespace Core.LgMes.Client.LgIntegrationQuery
{
    public class ElementsConfig
    {
        public ElementsConfig()
        {
            
        }
        //密钥
        static string encryptKey = "HNSTCGLG";
        //默认密钥向量
        static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
        /// <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 EncryptDES(string encryptString, string encryptKey)
        {
            try
            {   
                byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
                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
            {
                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 DecryptDES(string decryptString, string decryptKey)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Convert.FromBase64String(decryptString);
                DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
                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>
        /// 读取Value值
        /// </summary>
        /// <param name="key">KEY</param>
        /// <returns></returns>
        public static string GetConfigString(string key)
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //            
            string ElementsValue = "";//  = ConfigurationManager.AppSettings[key];

            XmlDocument xDoc = new XmlDocument();
            //获取可执行文件的路径和名称


            xDoc.Load(System.Windows.Forms.Application.StartupPath + "\\ElementsRowSet.config");
           // xDoc.Load(System.Windows.Forms.Application.ExecutablePath + ".config");
            XmlNode xNode;
            XmlElement xElem1;
            xNode = xDoc.SelectSingleNode("//appSettings");

            xElem1 = (XmlElement)xNode.SelectSingleNode("//add[@key='Elements']");
            if (xElem1 != null)
                ElementsValue = xElem1.GetAttribute("value");

            return ElementsValue;
        }

        /// <summary>
        /// 对Config文件进行写操作
        /// </summary>
        /// <param name="AppKey">Key值</param>
        /// <param name="AppValue">要写的值</param>
        public static void SetValue(string AppKey, string AppValue)
        {
            XmlDocument xDoc = new XmlDocument();
            //获取可执行文件的路径和名称
            xDoc.Load(System.Windows.Forms.Application.StartupPath + "\\ElementsRowSet.config");
            XmlNode xNode;
            XmlElement xElem1;
            XmlElement xElem2;
            xNode = xDoc.SelectSingleNode("//appSettings");

            xElem1 = (XmlElement)xNode.SelectSingleNode("//add[@key='" + AppKey + "']");
            if (xElem1 != null) xElem1.SetAttribute("value", AppValue);
            else
            {
                xElem2 = xDoc.CreateElement("add");
                xElem2.SetAttribute("key", AppKey);
                xElem2.SetAttribute("value", AppValue);
                xNode.AppendChild(xElem2);
            }
            xDoc.Save(System.Windows.Forms.Application.StartupPath + "\\ElementsRowSet.config");
        }

        /// <summary>
        /// 从文件获取列名
        /// </summary>
        public static string GetElementsRow()
        {
            string strElementsRow = DecryptDES(GetConfigString("Elements"), encryptKey);  //服务器名      
            return strElementsRow;
        }

        /// <summary>
        /// 将设置好的列名保存到文件
        /// </summary>
        public static void SetElementsRow(string strElementsRow)
        {
            //修改服务器联接
            SetValue("Elements", EncryptDES(strElementsRow, encryptKey));
        }
    }
}