using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Net;

using System.Net.Security;

using System.Security.Cryptography.X509Certificates;

using System.Text;

using System.Threading.Tasks;

namespace Nova.NovaiCloud.NovaiCloudCareHelper.Common

{

    public class HttpRequestHelper

    {

        public static string HttpPost(string Url, string postDataStr,ref bool isSuccess)

        {

            try

            {

                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);

                request.Method = "POST";

                request.ContentType = "application/json";

                request.ContentLength = Encoding.UTF8.GetByteCount(postDataStr);

                //request.CookieContainer = cookie;

                Stream myRequestStream = request.GetRequestStream();

                StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("gb2312"));

                myStreamWriter.Write(postDataStr);

                myStreamWriter.Close();

                HttpWebResponse response = (HttpWebResponse)request.GetResponse();

                //response.Cookies = cookie.GetCookies(response.ResponseUri);

                Stream myResponseStream = response.GetResponseStream();

                StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));

                string retString = myStreamReader.ReadToEnd();

                myStreamReader.Close();

                myResponseStream.Close();

                return retString;

            }

            catch (Exception e)

            {

                isSuccess = false;

                Console.Write(e.Message);

                return e.Message;

            }

        }

        public string HttpGet(string Url, string postDataStr)

        {

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url + (postDataStr == "" ? "" : "?") + postDataStr);

            request.Method = "GET";

            request.ContentType = "application/json";

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            Stream myResponseStream = response.GetResponseStream();

            StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));

            string retString = myStreamReader.ReadToEnd();

            myStreamReader.Close();

            myResponseStream.Close();

            return retString;

        }

        /// <summary>

        /// 创建GET方式的HTTP请求

        /// </summary>

        //public static HttpWebResponse CreateGetHttpResponse(string url, int timeout, string userAgent, CookieCollection cookies)

        public static HttpWebResponse CreateGetHttpResponse(string url)

        {

            HttpWebRequest request = null;

            if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))

            {

                //对服务端证书进行有效性校验（非第三方权威机构颁发的证书，如自己生成的，不进行验证，这里返回true）

                ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);

                request = WebRequest.Create(url) as HttpWebRequest;

                request.ProtocolVersion = HttpVersion.Version10;    //http版本，默认是1.1,这里设置为1.0

            }

            else

            {

                request = WebRequest.Create(url) as HttpWebRequest;

            }

            request.Method = "GET";

            //设置代理UserAgent和超时

            //request.UserAgent = userAgent;

            //request.Timeout = timeout;

            //if (cookies != null)

            //{

            //    request.CookieContainer = new CookieContainer();

            //    request.CookieContainer.Add(cookies);

            //}

            return request.GetResponse() as HttpWebResponse;

        }

        /// <summary>

        /// 创建POST方式的HTTP请求

        /// </summary>

        //public static HttpWebResponse CreatePostHttpResponse(string url, IDictionary<string, string> parameters, int timeout, string userAgent, CookieCollection cookies)

        public static HttpWebResponse CreatePostHttpResponse(string url, IDictionary<string, string> parameters)

        {

            HttpWebRequest request = null;

            //如果是发送HTTPS请求

            if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))

            {

                //ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);

                request = WebRequest.Create(url) as HttpWebRequest;

                //request.ProtocolVersion = HttpVersion.Version10;

            }

            else

            {

                request = WebRequest.Create(url) as HttpWebRequest;

            }

            request.Method = "POST";

            request.ContentType = "application/json";

            //设置代理UserAgent和超时

            //request.UserAgent = userAgent;

            //request.Timeout = timeout; 

            //if (cookies != null)

            //{

            //    request.CookieContainer = new CookieContainer();

            //    request.CookieContainer.Add(cookies);

            //}

            //发送POST数据

            if (!(parameters == null || parameters.Count == 0))

            {

                StringBuilder buffer = new StringBuilder();

                int i = 0;

                foreach (string key in parameters.Keys)

                {

                    if (i > 0)

                    {

                        buffer.AppendFormat("&{0}={1}", key, parameters[key]);

                    }

                    else

                    {

                        buffer.AppendFormat("{0}={1}", key, parameters[key]);

                        i++;

                    }

                }

                byte[] data = Encoding.ASCII.GetBytes(buffer.ToString());

                using (Stream stream = request.GetRequestStream())

                {

                    stream.Write(data, 0, data.Length);

                }

            }

            string[] values = request.Headers.GetValues("Content-Type");

            return request.GetResponse() as HttpWebResponse;

        }

        /// <summary>

        /// 获取请求的数据

        /// </summary>

        public static string GetResponseString(HttpWebResponse webresponse)

        {

            using (Stream s = webresponse.GetResponseStream())

            {

                StreamReader reader = new StreamReader(s, Encoding.UTF8);

                return reader.ReadToEnd();

            }

        }

        /// <summary>

        /// 验证证书

        /// </summary>

        private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)

        {

            if (errors == SslPolicyErrors.None)

                return true;

            return false;

        }

    }

}