using System;
using System.Collections.Generic;
using System.IO;
using System.Net.Http;
using System.Security.Cryptography;
using System.Text;

namespace DkSdkCore
{
	public class DtkApp
	{
		private string _appKey = "";

		private string _appSecret = "";

		public DtkApp()
		{
			//if (string.IsNullOrEmpty(appKey) || string.IsNullOrEmpty(appSecret))
			//{
			//	Console.WriteLine("AppKey 和 AppSecret 必填！");
			//	throw new Exception("AppKey 和 AppSecret 必填！");
			//}
			//this._appKey = appKey;
			//this._appSecret = appSecret;
			this._appKey = "641129ab40767";
			this._appSecret = "337944d910dcff5ba0ad331a4694b4b5";
		}

		public string Excute<T>(IDkRequest<T> request, string version = "v1.2.4") where T:DkResponse
        {
			return Get(request.GetUrl(), request.GetParameters(),version);

		}

		public string Get(string apiUrl, ApiParameters parameters,string version = "v1.2.4")
		{
			string result2;
			try
			{
				string url = this.BuildUrl(apiUrl, version, parameters);
				using (HttpClient client = new HttpClient())
				{
					HttpResponseMessage response = client.GetAsync(url).Result;
					if (response.IsSuccessStatusCode)
					{
						Stream expr_35 = response.Content.ReadAsStreamAsync().Result;
						StreamReader expr_45 = new StreamReader(expr_35, Encoding.GetEncoding("utf-8"));
						string result = expr_45.ReadToEnd();
						expr_45.Close();
						expr_35.Close();
						result2 = result;
					}
					else
					{
						result2 = response.StatusCode.ToString();
					}
				}
			}
			catch (Exception arg_7E_0)
			{
				result2 = arg_7E_0.Message;
			}
			return result2;
		}

		private string BuildUrl(string apiUrl, string version, ApiParameters parameters)
		{
			int nonce;
			string timer;
			string sign = this.MakeSign(out nonce, out timer);
			if (sign == "")
			{
				return "";
			}
			string url = string.Concat(new string[]
			{
				apiUrl.Trim(),
				"?appKey=",
				this._appKey.Trim(),
				"&nonce=",
				nonce.ToString(),
				"&signRan=",
				sign,
				"&version=",
				version.Trim(),
				"&timer=",
				timer
			});
			if (parameters.Value.Count <= 0)
			{
				return url;
			}
			for (int i = 0; i <= parameters.Value.Count - 1; i++)
			{
				url += string.Format("&{0}={1}", parameters.Value[i].Key, parameters.Value[i].Value);
			}
			return url;
		}

		private string MakeSign(out int nonce, out string timer)
		{
			Random rd = new Random();
			nonce = rd.Next(100000, 1000000);
			timer = DtkApp.GetTimeStamp();
			string result;
			try
			{
				result = DtkApp.Md5(string.Format("appKey={0}&timer={1}&nonce={2}&key={3}", new object[]
				{
					this._appKey,
					timer,
					nonce,
					this._appSecret
				})).ToUpper();
			}
			catch (Exception)
			{
				result = "";
			}
			return result;
		}

		private static string GetTimeStamp()
		{
			return Convert.ToInt64((DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0)).TotalMilliseconds).ToString();
		}

		private static string Md5(string value)
		{
			string result = string.Empty;
			if (string.IsNullOrEmpty(value))
			{
				return result;
			}
			using (MD5 md5 = MD5.Create())
			{
				result = DtkApp.GetMd5Hash(md5, value);
			}
			return result;
		}

		private static string GetMd5Hash(MD5 md5Hash, string input)
		{
			byte[] arg_17_0 = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(input));
			StringBuilder sBuilder = new StringBuilder();
			byte[] array = arg_17_0;
			for (int i = 0; i < array.Length; i++)
			{
				byte t = array[i];
				sBuilder.Append(t.ToString("x2"));
			}
			return sBuilder.ToString();
		}

		private static bool VerifyMd5Hash(MD5 md5Hash, string input, string hash)
		{
			string hashOfInput = DtkApp.GetMd5Hash(md5Hash, input);
			StringComparer comparer = StringComparer.OrdinalIgnoreCase;
			return comparer.Compare(hashOfInput, hash) == 0;
		}
	}

}