namespace OASystem.API.CMBPayBusiness
{
    public static class Common
    {
        public static string GetSignContent(Dictionary<string, string> sortedParams)
        {
            //字典排序，并用&进行拼接，例如，b=a，a=b，拼接后变成a=b&b=a
            StringBuilder content = new StringBuilder();
            //利用linq进行字典升序的排序
            var dicSort = from objDic in sortedParams orderby objDic.Key select objDic;
            foreach (KeyValuePair<string, string> kvp in dicSort)
            {
                string key = kvp.Key;
                string value = kvp.Value;
                if (null != key && null != value)
                {
                    content.Append(key + "=" + value + "&");
                }
            }
            if (content.Length != 0)
            {
                content.Remove(content.Length - 1, 1);
            }
            return content.ToString();
        }

        public static string GetSign(Dictionary<string, string> sortedParams)
        {
            //排序拼接参数
            string signContent = GetSignContent(sortedParams);
            //加签
            string sign = GmUtil.generateSmSign(signContent);
            return sign;
        }

        public static bool VerifySign(Dictionary<string, string> sortedParams)
        {
            //获取返回的sign
            string returnSign = sortedParams["sign"];
            //删除返回的sign
            sortedParams.Remove("sign");
            //排序拼接参数
            string signContent = GetSignContent(sortedParams);
            //验签
            bool flag = GmUtil.verifySmSign(signContent, returnSign);
            return flag;
        }

        public static Dictionary<string, string> PostForEntity(string url, string param, Dictionary<string, string> dic = null)
        {
            HttpWebRequest request;//仅作展示，这个方法用于发送网络请求可能有性能问题
            request = (HttpWebRequest)WebRequest.Create(url);
            // 以POST的方式提交
            request.Method = "POST";
            // 以json的方式提交
            request.ContentType = "application/json;charset=UTF-8";

            // 请求头部
            if (dic != null && dic.Count != 0)
            {
                foreach (var item in dic)
                {
                    request.Headers.Add(item.Key, item.Value);
                }
            }
            byte[] payload;
            // 请求参数
            payload = Encoding.UTF8.GetBytes(param);
            request.ContentLength = payload.Length;
            string strValue = "";
            try
            {
                Stream writer = request.GetRequestStream();
                writer.Write(payload, 0, payload.Length);
                writer.Close();
                HttpWebResponse response;
                response = (HttpWebResponse)request.GetResponse();
                Stream s;
                s = response.GetResponseStream();
                string StrDate = "";
                StreamReader Reader = new StreamReader(s, Encoding.UTF8);
                while ((StrDate = Reader.ReadLine()) != null)
                {
                    strValue += StrDate;
                }
            }
            catch (Exception e)
            {
                Console.WriteLine("post请求报错：" + e.Message);
                return null;
            }
            //JavaScriptSerializer jss = new JavaScriptSerializer();
            return JsonConvert.DeserializeObject<Dictionary<string, string>>(strValue);
        }

        /// <summary>
        /// 返回网络时间 --北京时间
        /// </summary>
        /// <returns></returns>
        public static DateTime GetBeijingTime()
        {
            WebRequest request = null;
            WebResponse response = null;
            WebHeaderCollection headerCollection = null;
            string datetime = string.Empty;
            try
            {
                request = WebRequest.Create("https://www.baidu.com");
                request.Timeout = 3000;
                request.Credentials = CredentialCache.DefaultCredentials;
                response = request.GetResponse();
                headerCollection = response.Headers;
                foreach (var h in headerCollection.AllKeys)
                {
                    if (h == "Date")
                    {
                        datetime = headerCollection[h];
                        break;
                    }
                }
                return Convert.ToDateTime(datetime);
            }
            catch (Exception)
            {
                return DateTime.Now;
            }
            finally
            {
                if (request != null)
                {
                    request.Abort();
                }
                if (response != null)
                {
                    response.Close();
                }
                if (headerCollection != null)
                {
                    headerCollection.Clear();
                }
            }

        }


        #region Http请求封装
        public static Dictionary<string, string> GetHeader(Dictionary<string, string> sortedParams)
        {
            //long timestamp = ConvertDateTime(System.DateTime.Now) / 10000000;
            long timestamp = ConvertDateTime(GetBeijingTime()) / 10000000;
            // 组apiSign加密Map
            Dictionary<string, string> apiSign = new Dictionary<string, string>();
            apiSign.Add("appid", BaseConfig.APPID);
            apiSign.Add("secret", BaseConfig.APP_SECRET);
            apiSign.Add("sign", sortedParams["sign"]);
            apiSign.Add("timestamp", "" + timestamp);

            // MD5加密
            string MD5Content = GetSignContent(apiSign);
            string apiSignString = GetMD5(MD5Content, "UTF-8");

            // 组request头部Map
            Dictionary<string, string> apiHeader = new Dictionary<string, string>();
            apiHeader.Add("appid", BaseConfig.APPID);
            apiHeader.Add("timestamp", "" + timestamp);
            apiHeader.Add("apisign", apiSignString);

            return apiHeader;
        }

        private static long ConvertDateTime(DateTime time)
        {
            DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1, 0, 0, 0, 0));
            return time.Ticks - startTime.Ticks;
        }

        public static string GetMD5(string data, string charset)
        {
            //MD5加密，同样的字符串在每次加密后的字符串是一样的
            byte[] bData = Encoding.GetEncoding(charset).GetBytes(data);
            MD5CryptoServiceProvider myMD5 = new MD5CryptoServiceProvider();
            bData = myMD5.ComputeHash(bData);
            StringBuilder sBuilder = new StringBuilder();
            for (int i = 0; i < bData.Length; i++)
            {
                //十六进制转成小写的英文字符
                sBuilder.Append(bData[i].ToString("x2"));
            }
            return sBuilder.ToString();
        }

        #endregion

        #region 二维码图片处理

        /// <summary>
        /// 调用此函数后使此两种图片合并，类似相册，有个
        /// 背景图，中间贴自己的目标图片
        /// </summary>
        /// <param name="imgBack">粘贴的源图片</param>
        /// <param name="destImg">粘贴的目标图片</param>
        public static Image CombinImage(Image imgBack, string destImg)
        {
            Image img = Image.FromFile(destImg);    //照片图片
            if (img.Height != 65 || img.Width != 65)
            {
                img = KiResizeImage(img, 65, 65, 0);
            }
            Graphics g = Graphics.FromImage(imgBack);
            g.DrawImage(imgBack, 0, 0, imgBack.Width, imgBack.Height);   //g.DrawImage(imgBack, 0, 0, 相框宽, 相框高);
                                                                         //g.FillRectangle(System.Drawing.Brushes.White, imgBack.Width / 2 - img.Width / 2 - 1, imgBack.Width / 2 - img.Width / 2 - 1,1,1);//相片四周刷一层黑色边框
                                                                         //g.DrawImage(img, 照片与相框的左边距, 照片与相框的上边距, 照片宽, 照片高);
            g.DrawImage(img, imgBack.Width / 2 - img.Width / 2, imgBack.Width / 2 - img.Width / 2, img.Width, img.Height);
            GC.Collect();
            return imgBack;
        }
        /// <summary>
        /// Resize图片
        /// </summary>
        /// <param name="bmp">原始Bitmap</param>
        /// <param name="newW">新的宽度</param>
        /// <param name="newH">新的高度</param>
        /// <param name="Mode">保留着，暂时未用</param>
        /// <returns>处理以后的图片</returns>
        public static Image KiResizeImage(Image bmp, int newW, int newH, int Mode)
        {
            try
            {
                Image b = new Bitmap(newW, newH);
                Graphics g = Graphics.FromImage(b);
                // 插值算法的质量
                g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                g.DrawImage(bmp, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel);
                g.Dispose();
                return b;
            }
            catch
            {
                return null;
            }
        }
        //public bool IsReusable
        //{
        //    get
        //    {
        //        return false;
        //    }
        //}

        #endregion

        #region 通知参数处理
        public static Dictionary<string, string> str2Map(string str)
        {
            Dictionary<string, string> result = new Dictionary<string, string>();
            string[] results = str.Split('&');
            if (results != null && results.Length > 0)
            {
                for (int var = 0; var < results.Length; ++var)
                {
                    string pair = results[var];
                    string[] kv = pair.Split('=');
                    if (kv != null && kv.Length == 2)
                    {
                        result.Add(kv[0], kv[1]);
                    }
                }
            }
            return result;
        }

        public static string decode(string str)
        {
            string result = null;
            if (str != null)
            {
                result = Uri.UnescapeDataString(str);
            }
            return result;
        }

        public static string NotifySign(string requestJsonStr)
        {
            return "";
        }
        #endregion
    }
}