using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.IO;
using Newtonsoft.Json.Linq;

namespace HZQR.Common
{
    public class HttpUtil
    {
        /// <summary>
        /// 创建POST方式的HTTP请求 
        /// </summary>
        /// <param name="url">请求路径</param>
        /// <param name="parameters">参数</param>
        /// <param name="userAgent">代理</param>
        /// <param name="cookies">cookie</param>
        /// <param name="timeout">超时时间</param>
        /// <param name="headParam">请求头</param>
        /// <returns></returns>

        public static string HttpUrlPost(string url, IDictionary<string, string> parameters,
             string userAgent = null, CookieCollection cookies = null, int timeout = 200,
             IDictionary<string, string> headParam = null, string contentType = "application/x-www-form-urlencoded")
        {
            string reString = "";
           
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;

            #region http请求带请求头部分
            if (!(headParam == null || headParam.Count == 0))
            {
                foreach (string key in headParam.Keys)
                {
                    request.Headers.Add(key, headParam[key]);
                }
            }
            #endregion

            request.Method = "POST";
            request.ContentType = contentType;
            //设置代理UserAgent和超时
            request.UserAgent = userAgent;
            if (timeout > 0)
            {
                request.Timeout = timeout * 1000;
            }
            if (cookies != null)
            {
                request.CookieContainer = new CookieContainer();
                request.CookieContainer.Add(cookies);
            }

            //发送POST数据  
            if (!(parameters == null || parameters.Count == 0))
            {
                if (contentType == "application/json")
                {
                    request.KeepAlive = false;
                    JObject info = new JObject();
                    foreach (string key in parameters.Keys)
                    {
                        info[key] = parameters[key];
                    }
                    string postDataStr = info.ToString();
                    byte[] postBytes = System.Text.Encoding.UTF8.GetBytes(postDataStr);
                    request.ContentLength = postBytes.Length;
                    using (Stream stream = request.GetRequestStream())
                    {
                        stream.Write(postBytes, 0, postBytes.Length);
                    }
                }
                else
                {
                    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);
                    }
                }
            }

            System.Net.HttpWebResponse res = request.GetResponse() as HttpWebResponse;
            if (res == null)
            {
                reString = "error";
            }
            else
            {
                //获取返回数据转为字符串
                reString = GetResponseString(res);
            }
            return reString;
        }


        /// <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();

            }
        }

        ///
        /// Get请求
        /// 
        /// 
        /// 字符串
        public static string HttpUrlGet(string url, int timeout = 200)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "GET";
            request.ContentType = "text/html;charset=UTF-8";
            request.UserAgent = null;
            request.Timeout = timeout;
            HttpWebResponse response;
            try
            {
                response = (HttpWebResponse)request.GetResponse();
            }
            catch (WebException ex)
            {
                response = (HttpWebResponse)ex.Response;
            }
            Stream myResponseStream = response.GetResponseStream();
            StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
            string retString = myStreamReader.ReadToEnd();
            myStreamReader.Close();
            myResponseStream.Close();

            return retString;
        }

    }
}