using CsharpHttpHelper;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace Api.Framework.Tools
{
    /// <summary>
    /// 快站短网址
    /// </summary>
    public class KuaiZhanShort
    {
        /// <summary>
        /// 快站缩短
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public static string GetShort(string url)
        {
            try
            {
                var APP_KEY = "LFxURPXd0Qy3";
                var APP_SECRET = "94e50cce6317fa27360247e64e7ae48149a04b88";
                var pams = new Dictionary<string, string>();
                pams.Add("url", url);
                pams.Add("appKey", APP_KEY);
                pams.Add("urlType", "default");
                var sign = signTopRequest(pams, APP_SECRET);
                pams.Add("sign", sign);

                var Postdata = HttpExtend.BuildQuery(pams);

                var http = new HttpHelper();
                var item = new HttpItem()
                {
                    URL = "https://cloud.kuaizhan.com/api/v1/tbk/genShortUrl",
                    Method = "post",
                    IsToLower = false,
                    Cookie = "",
                    Referer = "",
                    Postdata = Postdata,
                    Timeout = 100000,
                    ReadWriteTimeout = 30000,
                    UserAgent = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)",
                    ContentType = "application/x-www-form-urlencoded",
                    Allowautoredirect = false,
                    ProxyIp = ""
                };
                var result = http.GetHtml(item);

                //{"code":200,"msg":"ok","data":{"shortUrl":"http://kzurl07.cn/tbKy"}}
                var jobj = JObject.Parse(result.Html);
                if (jobj != null)
                {
                    if ((int)jobj["code"] == 200)
                    {
                        var data = (JObject)jobj["data"];
                        return data["shortUrl"].ToString();
                    }
                    else if ((int)jobj["code"] == 1001)
                    {
                        EventClient.OnEvent("短连接", "由于快站短连接接口请求的额度超限制,正在切换其他短连接");
                    }
                }
                else
                {

                }
            }
            catch (Exception ex)
            { }
            return url;
        }

        /// <summary>
        /// 计算快站的sign
        /// </summary>
        /// <param name="pams"></param>
        /// <param name="secret"></param>
        /// <returns></returns>
        private static String signTopRequest(Dictionary<String, String> pams, String secret)
        {
            // 第一步：检查参数是否已经排序
            IDictionary<string, string> sortedParams = new SortedDictionary<string, string>(pams, StringComparer.Ordinal);

            // 第二步：把所有参数名和参数值串在一起
            var query = new StringBuilder();
            query.Append(secret);

            foreach (KeyValuePair<string, string> kv in sortedParams)
            {
                if (!string.IsNullOrEmpty(kv.Key) && !string.IsNullOrEmpty(kv.Value) && "sign" != kv.Key)
                    query.Append(kv.Key).Append(kv.Value);
            }
            query.Append(secret);
            var ss = query.ToString();
            // 第三步：使用MD5加密
            return GetMd5(query.ToString());
        }

        /// <summary>
        /// MD5加密方法写法
        /// </summary>
        /// <param name="str">参数字符串</param>
        /// <returns></returns>
        private static string GetMd5(string str)
        {
            MD5 md5 = MD5.Create();
            byte[] ba = Encoding.Default.GetBytes(str);
            byte[] md55 = md5.ComputeHash(ba);
            StringBuilder sb = new StringBuilder();
            for (int I = 0; I < md55.Length; I++)
            {
                sb.Append(md55[I].ToString("x2"));
            }
            return sb.ToString();
        }


    }
}