using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Serialization;
using System.IO;
using System.Xml;
using System.Net;
using System.IO.Compression;
using System.Collections.Specialized;

namespace DSWeb.Areas.MvcShipping.Comm
{
    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;
        }

        public static string DoGet_Param_Header(string url, Dictionary<string, string> dic, int timeout = 10000, NameValueCollection Headers = null)
        {
            string responseString = "";//post返回的结果
            ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain, err) => { return true; };
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

            if (dic.Count > 0)
            {
                url += "?";

                var paramstr = "";

                foreach (var item in dic)
                {
                    if (paramstr != "") paramstr += "&";
                    paramstr += $"{item.Key}={item.Value}";
                }

                url += paramstr;
            }

            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
            req.Method = "GET";
            req.Timeout = timeout;

            if (Headers != null)
            {
                foreach (string key in Headers.Keys)
                {
                    req.Headers.Add(key, Headers[key]);
                }
            }

            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_JSON_Header(string url, string json, int timeout = 10000, NameValueCollection Headers = null)
        {
            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 (Headers != null)
            {
                foreach (string key in Headers.Keys)
                {
                    req.Headers.Add(key, Headers[key]);
                }
            }

            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;
        }


        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;
        }

    }
    public static class XmlHelper
    {
        private static string NAMESPACE = "http://HCHX.Schemas.";
        private static void XmlSerializeInternal ( Stream stream, object o, Encoding encoding,string ip)
        {
            if (o == null)
                throw new ArgumentNullException("o");
            if (encoding == null)
                throw new ArgumentNullException("encoding");

            XmlSerializer serializer = new XmlSerializer(o.GetType());

            XmlWriterSettings settings = new XmlWriterSettings();
            settings.Indent = true;
            settings.NewLineChars = "\r\n";
            settings.Encoding = encoding;
            settings.IndentChars = "    ";
            settings.NamespaceHandling = NamespaceHandling.OmitDuplicates;

            using (XmlWriter writer = XmlWriter.Create(stream, settings))
            {
                XmlSerializerNamespaces namespaces = new XmlSerializerNamespaces();
                namespaces.Add("ns", ip);

                serializer.Serialize(writer, o, namespaces);
                writer.Close();
            }
        }

        /// <summary>
        /// 将一个对象序列化为XML字符串
        /// </summary>
        /// <param name="o">要序列化的对象</param>
        /// <param name="encoding">编码方式</param>
        /// <param name="nameSpace">命名空间</param>
        /// <returns>序列化产生的XML字符串</returns>
        public static string XmlSerialize ( object o, Encoding encoding, string nameSpace,string ip )
        {
            NAMESPACE = NAMESPACE + nameSpace;
            using (MemoryStream stream = new MemoryStream())
            {
                XmlSerializeInternal(stream, o, encoding,ip);

                stream.Position = 0;
                using (StreamReader reader = new StreamReader(stream, encoding))
                {
                    return reader.ReadToEnd();
                }
            }
        }

        /// <summary>
        /// 将一个对象按XML序列化的方式写入到一个文件
        /// </summary>
        /// <param name="o">要序列化的对象</param>
        /// <param name="path">保存文件路径</param>
        /// <param name="encoding">编码方式</param>
        public static void XmlSerializeToFile ( object o, string path, Encoding encoding, string nameSpace ,string ip)
        {
            NAMESPACE = NAMESPACE + nameSpace;
            if (string.IsNullOrEmpty(path))
                throw new ArgumentNullException("path");

            using (FileStream file = new FileStream(path, FileMode.Create, FileAccess.Write))
            {
                XmlSerializeInternal(file, o, encoding,ip);
            }
        }

        /// <summary>
        /// 从XML字符串中反序列化对象
        /// </summary>
        /// <typeparam name="T">结果对象类型</typeparam>
        /// <param name="s">包含对象的XML字符串</param>
        /// <param name="encoding">编码方式</param>
        /// <returns>反序列化得到的对象</returns>
        public static T XmlDeserialize<T> ( string s, Encoding encoding )
        {
            if (string.IsNullOrEmpty(s))
                throw new ArgumentNullException("s");
            if (encoding == null)
                throw new ArgumentNullException("encoding");

            XmlSerializer mySerializer = new XmlSerializer(typeof(T));
            using (MemoryStream ms = new MemoryStream(encoding.GetBytes(s)))
            {
                using (StreamReader sr = new StreamReader(ms, encoding))
                {
                    return (T)mySerializer.Deserialize(sr);
                }
            }
        }

        /// <summary>
        /// 读入一个文件，并按XML的方式反序列化对象。
        /// </summary>
        /// <typeparam name="T">结果对象类型</typeparam>
        /// <param name="path">文件路径</param>
        /// <param name="encoding">编码方式</param>
        /// <returns>反序列化得到的对象</returns>
        public static T XmlDeserializeFromFile<T> ( string path, Encoding encoding )
        {
            if (string.IsNullOrEmpty(path))
                throw new ArgumentNullException("path");
            if (encoding == null)
                throw new ArgumentNullException("encoding");

            string xml = File.ReadAllText(path, encoding);
            return XmlDeserialize<T>(xml, encoding);
        }
    }
}