using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Security.Cryptography;
using System.Text;
using System.Xml;

namespace Mtxfw.Utility
{
    public class Interface_WxeditAddress
    {

        public static string Get_RequestHtml(HttpContext Context, string APPID,string accessToken, string webUrl)
        {
          
            //设置package订单参数
            SortedDictionary<string, string> dic = new SortedDictionary<string, string>();

            string wx_nonceStr = getNoncestr();
            dic.Add("url", webUrl);
            dic.Add("appid", APPID);
            dic.Add("timestamp", getTimestamp());
            dic.Add("noncestr", wx_nonceStr);
            dic.Add("accesstoken", accessToken);

            string get_sign = BuildRequest(dic);

            return "\"appId\" : \"" + APPID + "\",\"scope\" : \"jsapi_address\",\"signType\" : \"SHA1\",\"addrSign\" : \"" + get_sign + "\",\"timeStamp\" : \"" + getTimestamp() + "\",\"nonceStr\" : \"" + wx_nonceStr + "\"";
        }
        public static string getNoncestr()
        {
            Random random = new Random();
            return GetMD5(random.Next(1000).ToString(), "utf-8");
        }

        public static string getTimestamp()
        {
            TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
            return Convert.ToInt64(ts.TotalSeconds).ToString();
        }

        public static string BuildRequest(SortedDictionary<string, string> sParaTemp)
        {
            //获取过滤后的数组
            Dictionary<string, string> dicPara = new Dictionary<string, string>();
            dicPara = FilterPara(sParaTemp);

            //组合参数数组
            string prestr = CreateLinkString(dicPara);
            //拼接支付密钥
            string stringSignTemp = prestr;

            //获得加密结果
            string mySign = GetSHA(stringSignTemp);

            //返回转换为大写的加密串
            return mySign;
        }

        /// <summary>
        /// 除去数组中的空值和签名参数并以字母a到z的顺序排序
        /// </summary>
        /// <param name="dicArrayPre">过滤前的参数组</param>
        /// <returns>过滤后的参数组</returns>
        public static Dictionary<string, string> FilterPara(SortedDictionary<string, string> dicArrayPre)
        {
            Dictionary<string, string> dicArray = new Dictionary<string, string>();
            foreach (KeyValuePair<string, string> temp in dicArrayPre)
            {
                if (temp.Key != "sign" && !string.IsNullOrEmpty(temp.Value))
                {
                    dicArray.Add(temp.Key, temp.Value);
                }
            }

            return dicArray;
        }

        //组合参数数组
        public static string CreateLinkString(Dictionary<string, string> dicArray)
        {
            StringBuilder prestr = new StringBuilder();
            foreach (KeyValuePair<string, string> temp in dicArray)
            {
                prestr.Append(temp.Key + "=" + temp.Value + "&");
            }

            int nLen = prestr.Length;
            prestr.Remove(nLen - 1, 1);

            return prestr.ToString();
        }
        public static string GetSHA(string pwd)
        {
            string tmpStr = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(pwd, "SHA1");
            return tmpStr;
        }
        //加密
        public static string GetMD5(string pwd)
        {
            MD5 md5Hasher = MD5.Create();

            byte[] data = md5Hasher.ComputeHash(Encoding.UTF8.GetBytes(pwd));

            StringBuilder sBuilder = new StringBuilder();
            for (int i = 0; i < data.Length; i++)
            {
                sBuilder.Append(data[i].ToString("x2"));
            }

            return sBuilder.ToString();
        }

        /** 获取大写的MD5签名结果 */
        public static string GetMD5(string encypStr, string charset)
        {
            string retStr;
            MD5CryptoServiceProvider m5 = new MD5CryptoServiceProvider();

            //创建md5对象
            byte[] inputBye;
            byte[] outputBye;

            //使用GB2312编码方式把字符串转化为字节数组．
            try
            {
                inputBye = Encoding.GetEncoding(charset).GetBytes(encypStr);
            }
            catch (Exception ex)
            {
                inputBye = Encoding.GetEncoding("GB2312").GetBytes(encypStr);
            }
            outputBye = m5.ComputeHash(inputBye);

            retStr = System.BitConverter.ToString(outputBye);
            retStr = retStr.Replace("-", "").ToUpper();
            return retStr;
        }
    }
}