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

namespace ICSSoft.Common
{
    public class HTTPHelper
    {
        private static log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        public static string HttpPost(string apiName, string url, string body)
        {
            try
            {
                //log.Debug(url + Environment.NewLine + body);
                Encoding encoding = Encoding.UTF8;
                System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(url);
                request.Method = "POST";
                request.Accept = "application/json, text/javascript, */*"; //"text/html, application/xhtml+xml, */*";
                request.ContentType = "application/json; charset=utf-8";
                // request.ContentType = "text/html, application/xhtml+xml";
                byte[] buffer = encoding.GetBytes(body);
                request.ContentLength = buffer.Length;
                request.GetRequestStream().Write(buffer, 0, buffer.Length);
                System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();
                using (System.IO.StreamReader reader = new System.IO.StreamReader(response.GetResponseStream(), encoding))
                {
                    return reader.ReadToEnd();
                }
            }
            catch (System.Net.WebException ex)
            {
                log.Error(ex.ToString() + Environment.NewLine + url + Environment.NewLine + body);
                throw new Exception(apiName + "调用失败," + ex.Message);
            }
        }

        public static string HttpPost(string url, string body)
        {
            try
            {
                Encoding encoding = Encoding.UTF8;
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                request.Method = "POST";
                request.Accept = "text/html, application/xhtml+xml, */*";
                request.ContentLength = 110;
                request.ContentType = "application/json";

                byte[] buffer = encoding.GetBytes(body);
                request.ContentLength = buffer.Length;
                request.GetRequestStream().Write(buffer, 0, buffer.Length);
                log.Error(url + body);
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                using (StreamReader reader = new StreamReader(response.GetResponseStream(), encoding))
                {
                    return reader.ReadToEnd();
                }
            }
            catch (WebException ex)
            {
                var res = (HttpWebResponse)ex.Response;
                StringBuilder sb = new StringBuilder();
                StreamReader sr = new StreamReader(res.GetResponseStream(), Encoding.UTF8);
                sb.Append(sr.ReadToEnd());
                //string ssb = sb.ToString();

                //throw new Exception(sb.ToString());
                return "";
            }
        }

        /// <summary>
        /// 通过web api获取数据的方法
        /// </summary>
        /// <param name="url">api的url</param>
        /// <param name="method">请求类型,默认是get</param>
        /// <param name="postData">post请求所携带的数据</param>
        /// <returns></returns>
        public static string RequestData(string url, string method, string postData)
        {
            try
            {
                log.Error(postData);
                method = method.ToUpper();
                //设置安全通信协议   我方公司服务器有些强制使用tls1.2的安全通信协议,所以至少包含SecurityProtocolType.Tls12   如果沒有SecurityProtocolType.Tls12设置会报错:HttpWebRequest底层连接已关闭:传送时发生意外错误  
                ServicePointManager.SecurityProtocol =
                    SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls |
                    SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;

                //创建请求实例
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

                //设置请求类型
                request.Method = method;
                //设置请求消息主体的编码方法
                request.ContentType = "application/json";

                //POST方式處理
                if (method == "POST")
                {
                    //用UTF8字符集对post请求携带的数据进行编码,可防止中文乱码
                    byte[] byteArray = Encoding.UTF8.GetBytes(postData);
                    //指定客户端post请求携带的数据的长度
                    request.ContentLength = byteArray.Length;

                    //创建一个tream,用于写入post请求所携带的数据(该数据写入了请求体)
                    Stream stream = request.GetRequestStream();
                    stream.Write(byteArray, 0, byteArray.Length);
                    stream.Close();
                }

                //获取请求的响应实例
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                //获取读取流实体,用来以UTF8字符集读取响应流中的数据
                StreamReader myStreamReader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
                //进行数据读取
                string retString = myStreamReader.ReadToEnd();
                myStreamReader.Close();
                return retString;
            }
            catch (Exception ex)
            {
                //拋出異常
                throw ex;
            }
        }

        public static string WorkDayPostData(string URL, string JsonData, string ContentType)
        {
            string str = string.Empty;
            try
            {
                WebRequest request = WebRequest.Create(URL);
                request.Method = "POST";
                byte[] bytes = System.Text.Encoding.UTF8.GetBytes(JsonData);
                request.ContentType = ContentType;
                request.ContentLength = bytes.Length;
                using (Stream postStream = request.GetRequestStream())
                {
                    postStream.Write(bytes, 0, bytes.Length);
                }
                request.Credentials = CredentialCache.DefaultCredentials;
                WebResponse response = null;
                try
                {
                    response = request.GetResponse();
                }
                catch (WebException ex)
                {
                    if (ex.Status == WebExceptionStatus.ProtocolError)
                        response = (WebResponse)ex.Response;
                }
                if (response != null)
                {
                    using (StreamReader st = new StreamReader(response.GetResponseStream(), System.Text.Encoding.UTF8))
                    {
                        str = System.Web.HttpUtility.UrlDecode(st.ReadToEnd());
                    }
                }
            }
            catch (Exception ex)
            {
                str = ex.Message;
            }
            return str;

        }

        public static void CreateObject(string URL, string DATA)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
            request.Method = "POST";
            request.ContentType = "application/json";
            request.ContentLength = DATA.Length;
            StreamWriter requestWriter = new StreamWriter(request.GetRequestStream(), System.Text.Encoding.ASCII);
            requestWriter.Write(DATA);
            requestWriter.Close();

            try
            {
                WebResponse webResponse = request.GetResponse();
                Stream webStream = webResponse.GetResponseStream();
                StreamReader responseReader = new StreamReader(webStream);
                string response = responseReader.ReadToEnd();
                Console.Out.WriteLine(response);
                responseReader.Close();
            }
            catch (Exception e)
            {
                Console.Out.WriteLine("-----------------");
                Console.Out.WriteLine(e.Message);
            }

        }

        public static string Post(string posturl, string jsonstr)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(posturl);

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

            //json字符串转为字节数组 
            byte[] bytes = System.Text.Encoding.UTF8.GetBytes(jsonstr);

            //设置请求的ContentLength   
            request.ContentLength = bytes.Length;

            //发送请求，获得请求流  
            Stream stream;
            try
            {
                //获取用于写入请求数据的Stream对象
                stream = request.GetRequestStream();
            }
            catch (Exception ex)
            {
                stream = null;
                Console.WriteLine(ex.Message);
            }
            //把数据写入流
            stream.Write(bytes, 0, bytes.Length);

            stream.Close();

            HttpWebResponse response;
            try
            {
                //获得响应流
                response = (HttpWebResponse)request.GetResponse();
            }
            catch (WebException ex)
            {
                response = ex.Response as HttpWebResponse;
            }

            Stream s = response.GetResponseStream();

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

            string strVal = sr.ReadToEnd().Trim();
            sr.Close();

            s.Close();

            return strVal;
        }

        /// <summary>
        /// HTTP访问method  常用的几样
        /// </summary>
        public enum HttpVerb
        {
            /// <summary>
            /// get：获取
            /// </summary>
            GET,
            /// <summary>
            /// post：修改
            /// </summary>
            POST,
            /// <summary>
            /// put：写入
            /// </summary>
            PUT,
            /// <summary>
            /// delete：删除
            /// </summary>
            DELETE
        }
        /// <summary>
        /// HTTP访问格式类型，根据Postman整理
        /// </summary>
        public enum HttpContentType
        {
            /// <summary>
            /// text/plain
            /// </summary>
            Text,
            /// <summary>
            /// application/json
            /// </summary>
            JSON,
            /// <summary>
            /// application/xml
            /// </summary>
            XML,
            /// <summary>
            /// text/xml
            /// </summary>
            TextXML,
            /// <summary>
            /// text/html
            /// </summary>
            HTML,
            /// <summary>
            /// application/javascript
            /// </summary>
            Javascript
        }
        /// <summary>
        /// Rest方式访问方法，ContentType为application/json
        /// </summary>
        public class RestHelper
        {
            /// <summary>
            /// 请求的url地址
            /// </summary>
            public string EndPoint { get; set; }
            /// <summary>
            /// 请求的方法,默认 GET
            /// </summary>
            public HttpVerb Method { get; set; }
            /// <summary>
            /// 格式类型：默认application/json 
            /// </summary>
            public HttpContentType ContentType { get; set; }
            /// <summary>
            /// 传送的数据，如json字符串
            /// </summary>
            public string PostData { get; set; }
            /// <summary>
            /// 编码规范，默认 UTF8
            /// </summary>
            public Encoding HttpEncoding { get; set; }
            /// <summary>
            /// 构造函数
            /// </summary>
            public RestHelper(HttpContentType contentType = HttpContentType.JSON)
            {
                EndPoint = "";
                Method = HttpVerb.GET;
                ContentType = contentType;
                PostData = "";
                HttpEncoding = Encoding.UTF8;
            }
            /// <summary>
            /// 构造函数
            /// </summary>
            public RestHelper(string endpoint, HttpContentType contentType = HttpContentType.JSON)
            {
                EndPoint = endpoint;
                Method = HttpVerb.GET;
                ContentType = contentType;
                PostData = "";
                HttpEncoding = Encoding.UTF8;
            }
            /// <summary>
            /// 构造函数
            /// </summary>
            public RestHelper(string endpoint, HttpVerb method, HttpContentType contentType = HttpContentType.JSON)
            {
                EndPoint = endpoint;
                Method = method;
                ContentType = contentType;
                PostData = "";
                HttpEncoding = Encoding.UTF8;
            }

            /// <summary>
            /// 构造函数
            /// </summary>
            public RestHelper(string endpoint, HttpVerb method, string postData, HttpContentType contentType = HttpContentType.JSON)
            {
                EndPoint = endpoint;
                Method = method;
                ContentType = contentType;
                PostData = postData;
                HttpEncoding = Encoding.UTF8;
            }

            /// <summary>
            /// 构造函数
            /// </summary>
            public RestHelper(string endpoint, Encoding encoding, HttpVerb method = HttpVerb.GET, string postData = "", HttpContentType contentType = HttpContentType.JSON)
            {
                EndPoint = endpoint;
                Method = method;
                ContentType = contentType;
                PostData = postData;
                HttpEncoding = encoding;
            }

            /// <summary>
            /// 直接访问
            /// </summary>
            /// <returns></returns>
            public string MakeRequest()
            {
                return MakeRequest("");
            }

            /// <summary>
            /// 带参数访问，如 MakeRequest("?param=0")
            /// </summary>
            /// <param name="parameters"></param>
            /// <returns></returns>
            public string MakeRequest(string parameters)
            {
                try
                {
                    var request = (HttpWebRequest)WebRequest.Create(EndPoint + parameters);

                    request.Method = Method.ToString();
                    request.ContentLength = 0;
                    request.ContentType = GetContentType(ContentType);

                    //如果传送的数据不为空，并且方法是post或put
                    if (!string.IsNullOrEmpty(PostData) && (Method == HttpVerb.POST || Method == HttpVerb.PUT))
                    {
                        var bytes = HttpEncoding.GetBytes(PostData);//编码方式，默认UTF-8  
                        request.ContentLength = bytes.Length;

                        using (var writeStream = request.GetRequestStream())
                        {
                            writeStream.Write(bytes, 0, bytes.Length);
                        }
                    }
                    using (var response = (HttpWebResponse)request.GetResponse())
                    {
                        var responseValue = string.Empty;

                        if (response.StatusCode != HttpStatusCode.OK)
                        {
                            var message = String.Format("Request failed. Received HTTP {0}", response.StatusCode);
                            throw new ApplicationException(message);
                        }

                        // grab the response  
                        using (var responseStream = response.GetResponseStream())
                        {
                            if (responseStream != null)
                            {
                                using (var reader = new StreamReader(responseStream))
                                {
                                    responseValue = reader.ReadToEnd();
                                }
                            }
                        }
                        return responseValue;
                    }

                }
                catch (Exception e)
                {
                    throw new Exception(e.Message);
                }
            }

            /// <summary>
            /// 将content type转成字符串描述
            /// </summary>
            /// <param name="contentType"></param>
            /// <returns></returns>
            private string GetContentType(HttpContentType contentType)
            {
                switch (contentType)
                {
                    case HttpContentType.Text:
                        return "text/plain";
                    case HttpContentType.JSON:
                        return "application/json";
                    case HttpContentType.XML:
                        return "application/xml";
                    case HttpContentType.TextXML:
                        return "text/xml";
                    case HttpContentType.HTML:
                        return "text/html";
                    case HttpContentType.Javascript:
                        return "application/javascript";
                    default:
                        return "";
                }
            }

        }


    }
}