using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Security.Cryptography;
using System.Text;

namespace WX.CRM.Common.WxPay
{
    public class CheckPayApi
    {
        public CheckPayApi(string username, string secret, string identityKey)
        {
            UserName = username;
            Secret = secret;
            IdentityKey = identityKey;
        }

        /// <summary>
        /// 微信支付状态
        /// </summary>
        /// <param name="param"></param>
        /// <returns></returns>
        public ApiResult<PayStatus> WechatPayStatus(Dictionary<string, object> param)
        {
            try
            {
                string url = $"{apiPath}wechat/queryTradeStatusByChannel";
                //默认参数 

                //拼接验证头
                Dictionary<string, string> header = new Dictionary<string, string>();
                var timestamps = GetTimeStamp();
                var sign = GetSign(param, timestamps);
                var authorization = $"{UserName}:{sign}";

                header.Add("authorization", authorization);
                header.Add("timestamps", timestamps);

                //请求
                var req = Post(url, param, header);
                LogHelper.Info("wechat:" + req);
                //返回 
                var reqInfo = JsonConvert.DeserializeObject<ApiResult<PayStatus>>(req);
                if (reqInfo == null)
                {
                    return new ApiResult<PayStatus> { code = "501", message = "数据为空" };
                }
                return reqInfo;
            }
            catch (Exception ex)
            {
                return new ApiResult<PayStatus> { code = "501", message = ex.Message };
            }
        }
        /// <summary>
        /// 支付宝支付状态
        /// </summary>
        /// <param name="param"></param>
        /// <returns></returns>
        public ApiResult<PayStatus> AliPayStatus(Dictionary<string, object> param)
        {
            try
            {
                string url =  $"{apiPath}alipay/queryTradeStatusByChannel";
                
                //拼接验证头
                Dictionary<string, string> header = new Dictionary<string, string>();
                var timestamps = GetTimeStamp();
                var sign = GetSign(param, timestamps);
                var authorization = $"{UserName}:{sign}";

                header.Add("authorization", authorization);
                header.Add("timestamps", timestamps);

                //请求
                var req = Post(url, param, header);
                LogHelper.Info("alipay:" + req);
                //返回 
                var reqInfo = JsonConvert.DeserializeObject<ApiResult<PayStatus>>(req);
                if (reqInfo == null)
                {
                    return new ApiResult<PayStatus> { code = "501", message = "数据为空" };
                }
                return reqInfo;
            }
            catch (Exception ex)
            {
                return new ApiResult<PayStatus> { code = "501", message = ex.Message };
            }
        }


        #region 内部参数
        // https://uppay.soft.dn8188.com/payServer/ 正式
        // https://uppay.soft.dn8188.com/payServerTest/ 测试
        // "https://uppay.soft.dn8188.com/unifiedpaytest/"; 本地
        private string apiPath = Utility.GetSettingByKey("DGpayApi");
        private string UserName { get; set; }
        private string Secret { get; set; }
        //DG_SOFTWARE
        private string IdentityKey { get; set; }
        #endregion

        #region 内部方法
        /// <summary>
        /// 内置请求
        /// </summary>
        /// <param name=""></param>
        /// <returns></returns>
        private string Post(string url, Dictionary<string, object> param, Dictionary<string, string> header)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            //请求设置
            request.Method = "POST";
            request.ContentType = "application/json;charset=UTF-8";
            request.Timeout = 3000;//设置超时时间
            //拼接请求头
            foreach (var item in header)
            {
                request.Headers.Add(item.Key, item.Value);
            }
            //拼接参数   
            if (param.Any())
            {
                var pStr = JsonConvert.SerializeObject(param);
                byte[] data = Encoding.UTF8.GetBytes(pStr);
                using (Stream stream = request.GetRequestStream())
                {
                    stream.Write(data, 0, data.Length);
                }
            }
            //提交请求
            HttpWebResponse response;
            try
            {
                response = (HttpWebResponse)request.GetResponse();

            }
            catch (WebException ex)
            {
                response = (HttpWebResponse)ex.Response;
            }
            //解析请求结果
            using (Stream myResponseStream = response.GetResponseStream())
            {
                StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
                string retString = myStreamReader.ReadToEnd();
                myStreamReader.Close();
                //记录请求情况
                LogHelper.Info($"url:{url},param:{JsonConvert.SerializeObject(param)},header:{JsonConvert.SerializeObject(header)},req:{retString}");
                return retString;
            }
        }
        /// <summary>
        /// 计算签名
        /// </summary>
        /// <param name="param"></param>
        /// <param name="timestamps"></param>
        /// <returns></returns>
        private string GetSign(Dictionary<string, object> param, string timestamps)
        {

            //一次排序
            var newP = param.OrderBy(m => m.Key).ToDictionary(m => m.Key, n => n.Value);
            var pJosn = JsonConvert.SerializeObject(newP);

            //二次排序
            var enStrList = new string[] { UserName, pJosn, Secret, timestamps };
            Array.Sort(enStrList, string.CompareOrdinal);

            //拼接
            var enStr = string.Join("", enStrList);
            //md5 加密
            return _md5(enStr);
        }
        /// <summary>
        ///  计算 md5
        /// </summary>
        /// <param name="enCode"></param>
        /// <returns></returns>
        private string _md5(string enCode)
        {
            string res = "";
            byte[] data = Encoding.GetEncoding("utf-8").GetBytes(enCode);
            MD5 md5 = new MD5CryptoServiceProvider();
            byte[] bytes = md5.ComputeHash(data);
            for (int i = 0; i < bytes.Length; i++)
            {
                res += bytes[i].ToString("x2");
            }
            return res;
        }
        /// <summary>
        /// 获取时间戳
        /// </summary>
        /// <returns></returns>
        private string GetTimeStamp()
        {
            TimeSpan ts = DateTime.Now - new DateTime(1970, 1, 1, 8, 0, 0, 0);
            return Convert.ToInt64(ts.TotalSeconds).ToString();
        }
        #endregion
    }
    /// <summary>
    /// 返回格式
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class ApiResult<T> where T : new()
    {
        public string code { get; set; }
        public T data { get; set; }
        public string message { get; set; }
    }
    public class PayStatus
    {
        /// <summary>
        /// 三方订单号(微信/支付宝)
        /// </summary>
        public string tradeNo { get; set; }
        /// <summary>
        /// 商户订单号
        /// </summary>
        public string outTradeNo { get; set; }
        /// <summary>
        /// 金额
        /// </summary>
        public int totalAmount { get; set; }
        /// <summary>
        /// 状态 0 未支付 1 已支付
        /// </summary>
        public int tradeStatus { get; set; }
        /// <summary>
        /// 付款时间
        /// </summary>
        public DateTime? payTime { get; set; }
    }
}