using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Net;
using System.Text;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

namespace JobGuanMaoYun
{
    public static class DataTableToJsonHelper
    {
        public static string ConvertToString(DataTable table)
        {
            StringWriter writer = new StringWriter();
            JsonWriter jsonWriter = new JsonTextWriter(writer);

            jsonWriter.WriteStartArray();
            foreach (DataRow row in table.Rows)
            {
                jsonWriter.WriteStartObject();

                foreach (DataColumn col in table.Columns)
                {
                    jsonWriter.WritePropertyName(col.ColumnName);
                    jsonWriter.WriteValue(row[col.ColumnName]);
                }

                jsonWriter.WriteEndObject();
            }
            jsonWriter.WriteEndArray();

            return writer.ToString();
        }

        public static JArray ConvertToJson(DataTable table)
        {
            JArray jarr = new JArray();
            foreach (DataRow row in table.Rows)
            {
                JObject jobj = new JObject();

                foreach (DataColumn col in table.Columns)
                {
                    jobj.Add(col.ColumnName, new JValue(row[col.ColumnName]));
                }

                jarr.Add(jobj);
            }

            return jarr;

        }
    }


    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, int timeout = 10000)
        {
            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.Timeout = timeout;
            req.Headers.Add("Accept-Encoding", "gzip, deflate");

            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);
                stream.Close();
            }
            else
            {
                req.ContentLength = 0;
            }
            var response = req.GetResponse();
            responseString = GetResponseBody((HttpWebResponse)response);
            return responseString;
        }

        public static string DoPost(string url, Dictionary<string, string> dic, int timeout = 10000)
        {
            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.Timeout = timeout;
            req.Headers.Add("Accept-Encoding", "gzip, deflate");

            if (dic.Count > 0)
            {
                string strContent = string.Empty;
                foreach (var item in dic)
                {
                    if (strContent.Length > 0)
                    {
                        strContent += "&";
                    }
                    strContent += $"{item.Key}={item.Value}";
                }

                byte[] postBytes = Encoding.UTF8.GetBytes(strContent);
                req.ContentType = "application/x-www-form-urlencoded";
                req.ContentLength = postBytes.Length;
                Stream stream = req.GetRequestStream();
                stream.Write(postBytes, 0, postBytes.Length);
                stream.Close();
            }
            else
            {
                req.ContentLength = 0;
            }
            var response = req.GetResponse();
            responseString = GetResponseBody((HttpWebResponse)response);
            return responseString;
        }

        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;
        }
    }
}