/*--------------------------------------------------------------------------
* BasicAPI.cs
 *Auth:deepleo
* Date:2013.12.31
* Email:2586662969@qq.com
 * Website:http://www.weixinsdk.net
*--------------------------------------------------------------------------*/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Http;
using Codeplex.Data;
using System.IO;
using Deepleo.Weixin.SDK.Helpers;

namespace Deepleo.Weixin.SDK
{
    /// <summary>
    /// 对应微信API的 "基础支持"
    /// </summary>
    public class BasicAPI
    {
        /// <summary>
        /// 检查签名是否正确:
        /// http://mp.weixin.qq.com/wiki/index.php?title=%E6%8E%A5%E5%85%A5%E6%8C%87%E5%8D%97
        /// </summary>
        /// <param name="signature"></param>
        /// <param name="timestamp"></param>
        /// <param name="nonce"></param>
        /// <param name="token">AccessToken</param>
        /// <returns>
        /// true: check signature success
        /// false: check failed, 非微信官方调用!
        /// </returns>
        public static bool CheckSignature(string signature, string timestamp, string nonce, string token, out string ent)
        {
            var arr = new[] { token, timestamp, nonce }.OrderBy(z => z).ToArray();
            var arrString = string.Join("", arr);
            var sha1 = System.Security.Cryptography.SHA1.Create();
            var sha1Arr = sha1.ComputeHash(Encoding.UTF8.GetBytes(arrString));
            StringBuilder enText = new StringBuilder();
            foreach (var b in sha1Arr)
            {
                enText.AppendFormat("{0:x2}", b);
            }
            ent = enText.ToString();
            return signature == enText.ToString();
        }

        /// <summary>
        /// 获取AccessToken
        /// http://mp.weixin.qq.com/wiki/index.php?title=%E8%8E%B7%E5%8F%96access_token
        /// </summary>
        /// <param name="grant_type"></param>
        /// <param name="appid"></param>
        /// <param name="secrect"></param>
        /// <returns>access_toke</returns>
        public static dynamic GetAccessToken(string appid, string secrect)
        {
            var url = string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type={0}&appid={1}&secret={2}", "client_credential", appid, secrect);
            var client = new HttpClient();
            var result = client.GetAsync(url).Result;
            if (!result.IsSuccessStatusCode) return string.Empty;
            var token = DynamicJson.Parse(result.Content.ReadAsStringAsync().Result);
            return token;
        }
        /// <summary>
        /// 获取微信服务器IP地址
        ///http://mp.weixin.qq.com/wiki/0/2ad4b6bfd29f30f71d39616c2a0fcedc.html
        /// </summary>
        /// <param name="access_token"></param>
        /// <returns>{"ip_list":["127.0.0.1","127.0.0.1"]}</returns>
        public static dynamic GetCallbackIP(string access_token)
        {
            var url = string.Format("https://api.weixin.qq.com/cgi-bin/getcallbackip?access_token={0}", access_token);
            var client = new HttpClient();
            var result = client.GetAsync(url).Result;
            if (!result.IsSuccessStatusCode) return string.Empty;
            return DynamicJson.Parse(result.Content.ReadAsStringAsync().Result);
        }

    }
}