using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Security;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading.Tasks;

namespace MyCode.Project.Infrastructure.WebPost
{
    public class RongHttpClient
    {
        String methodUrl = null;
        String postStr = null;
        String appkey = null;
        String appSecret = null;

        public RongHttpClient(String appkey, String appSecret, String methodUrl, String postStr)
        {
            this.methodUrl = methodUrl;
            this.postStr = postStr;
            this.appkey = appkey;
            this.appSecret = appSecret;
        }

        public String ExecutePost()
        {
            Random rd = new Random();
            int rd_i = rd.Next();
            String nonce = Convert.ToString(rd_i);

            String timestamp = Convert.ToString(ConvertDateTimeInt(DateTime.Now));

            String signature = GetHash(this.appSecret + nonce + timestamp);

            //ServicePointManager.ServerCertificateValidationCallback += ValidateRemoteCertificate;
            //ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;

            HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(this.methodUrl);

            myRequest.Method = "POST";
            myRequest.ContentType = "application/x-www-form-urlencoded";

            myRequest.Headers.Add("App-Key", this.appkey);
            myRequest.Headers.Add("Nonce", nonce);
            myRequest.Headers.Add("Timestamp", timestamp);
            myRequest.Headers.Add("Signature", signature);
            myRequest.ReadWriteTimeout = 30 * 1000;

            byte[] data = Encoding.UTF8.GetBytes(this.postStr);
            myRequest.ContentLength = data.Length;

            Stream newStream = myRequest.GetRequestStream();

            // Send the data.
            newStream.Write(data, 0, data.Length);
            newStream.Close();

            HttpWebResponse myResponse = null;
            try
            {
                myResponse = (HttpWebResponse)myRequest.GetResponse();
                StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);

                string content = reader.ReadToEnd();
                return content;
            }
            //异常请求
            catch (WebException e)
            {
                myResponse = (HttpWebResponse)e.Response;
                using (Stream errData = myResponse.GetResponseStream())
                {
                    using (StreamReader reader = new StreamReader(errData))
                    {
                        string text = reader.ReadToEnd();

                        return text;
                    }
                }
            }

            //WebClient myWebClient = new WebClient();

            //myWebClient.Headers.Add("App-Key", this.appkey);
            //myWebClient.Headers.Add("Nonce", nonce);
            //myWebClient.Headers.Add("Timestamp", timestamp);

            //myWebClient.Headers.Add("Signature", signature);

            //myWebClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");

            //byte[] byteArray = Encoding.UTF8.GetBytes(this.postStr);

            //byte[] responseArray = myWebClient.UploadData(this.methodUrl, "POST", byteArray);

            //return Encoding.UTF8.GetString(responseArray);

        }
        /// <summary>  
        /// DateTime时间格式转换为Unix时间戳格式  
        /// </summary>  
        /// <param name="time"> DateTime时间格式</param>  
        /// <returns>Unix时间戳格式</returns>  
        public int ConvertDateTimeInt(System.DateTime time)
        {
            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
            return (int)(time - startTime).TotalSeconds;
        }

        public String GetHash(String input)
        {
            //建立SHA1对象
            SHA1 sha = new SHA1CryptoServiceProvider();

            //将mystr转换成byte[]
            UTF8Encoding enc = new UTF8Encoding();
            byte[] dataToHash = enc.GetBytes(input);

            //Hash运算
            byte[] dataHashed = sha.ComputeHash(dataToHash);

            //将运算结果转换成string
            string hash = BitConverter.ToString(dataHashed).Replace("-", "");

            return hash;
        }

        /// <summary>
        /// Certificate validation callback.
        /// </summary>
        private static bool ValidateRemoteCertificate(object sender, X509Certificate cert, X509Chain chain, SslPolicyErrors error)
        {
            // If the certificate is a valid, signed certificate, return true.
            if (error == System.Net.Security.SslPolicyErrors.None)
            {
                return true;
            }

            Console.WriteLine("X509Certificate [{0}] Policy Error: '{1}'",
                cert.Subject,
                error.ToString());

            return false;
        }
    }
}