using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Net;
using System.Text;
using System.Web;
using System.Web.Script.Serialization;

namespace DSWeb.Areas.Dispatch.Helper
{
    public static class WebRequestHelper
    {
        public static string DoGet(string url)
        {
            string responseString = "";//post返回的结果
            ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain, err) => { return true; };
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
            req.Method = "GET";
            req.ContentLength = 0;

            var response = req.GetResponse();
            Stream streamResponse = response.GetResponseStream();
            StreamReader streamRead = new StreamReader(streamResponse);
            responseString = streamRead.ReadToEnd();
            response.Close();
            streamRead.Close();

            return responseString;
        }

        public static string DoPost(string url, string json)
        {
            string responseString = "";//post返回的结果
            ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain, err) => { return true; };
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
            req.Method = "POST";

            if (!string.IsNullOrWhiteSpace(json))
            {
                byte[] postBytes = Encoding.UTF8.GetBytes(json);
                req.ContentType = "application/json; charset=utf-8";
                req.ContentLength = Encoding.UTF8.GetByteCount(json);
                Stream stream = req.GetRequestStream();
                stream.Write(postBytes, 0, postBytes.Length);
                req.Timeout = 10000;
                stream.Close();
            }
            else
            {
                req.ContentLength = 0;
            }
            var response = req.GetResponse();
            Stream streamResponse = response.GetResponseStream();
            StreamReader streamRead = new StreamReader(streamResponse);
            responseString = streamRead.ReadToEnd();
            response.Close();
            streamRead.Close();

            return responseString;
        }

        public static string DoPost_DSWMS(string url, Dictionary<string, string> dic, int timeout = 10000)
        {
            try
            {
                string responseString = "";//post返回的结果
                ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain, err) => { return true; };
                ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
                HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
                req.Method = "POST";
                req.ContentType = "application/json";
                req.Timeout = timeout;
                req.Headers.Add("Accept-Encoding", "gzip, deflate");




                if (dic.Count > 0)
                {
                    using (var streamWriter = new StreamWriter(req.GetRequestStream()))
                    {
                        string json = new JavaScriptSerializer().Serialize(
                            dic
                            );

                        streamWriter.Write(json);
                    }

                }
                else
                {
                    req.ContentLength = 0;
                }
                var response = req.GetResponse();
                responseString = GetResponseBody((HttpWebResponse)response);
                return responseString;
            }
            catch (Exception e) {
                return e.Message;
            }
        }

        public static string DoPost_Json(string url, object obj, int timeout = 10000)
        {
            try
            {
                string responseString = "";//post返回的结果
                ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain, err) => { return true; };
                ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
                HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
                req.Method = "POST";
                req.ContentType = "application/json";
                req.Timeout = timeout;
                req.Headers.Add("Accept-Encoding", "gzip, deflate");




                if (obj != null)
                {
                    using (var streamWriter = new StreamWriter(req.GetRequestStream()))
                    {
                        string json = new JavaScriptSerializer().Serialize(
                            obj
                            );

                        streamWriter.Write(json);
                    }

                }
                else
                {
                    req.ContentLength = 0;
                }
                var response = req.GetResponse();
                responseString = GetResponseBody((HttpWebResponse)response);
                return responseString;
            }
            catch (Exception e)
            {
                return e.Message;
            }
        }
        private static string GetResponseBody(HttpWebResponse response)
        {
            string responseBody = string.Empty;
            if (response.ContentEncoding.ToLower().Contains("gzip"))
            {
                using (GZipStream stream = new GZipStream(response.GetResponseStream(), CompressionMode.Decompress))
                {
                    using (StreamReader reader = new StreamReader(stream))
                    {
                        responseBody = reader.ReadToEnd();
                    }
                }
            }
            else if (response.ContentEncoding.ToLower().Contains("deflate"))
            {
                using (DeflateStream stream = new DeflateStream(
                    response.GetResponseStream(), CompressionMode.Decompress))
                {
                    using (StreamReader reader =
                        new StreamReader(stream, Encoding.UTF8))
                    {
                        responseBody = reader.ReadToEnd();
                    }
                }
            }
            else
            {
                using (Stream stream = response.GetResponseStream())
                {
                    using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
                    {
                        responseBody = reader.ReadToEnd();
                    }
                }
            }
            return responseBody;
        }

    }

}