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

namespace efunbox_xyyf_windows.util
{
    public class HttpUtil
    {
        public static HttpResult HttpRequest(HttpItem httpItem)
        {
            HttpResult result = new HttpResult();
            try
            {
                HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(httpItem.Url);
                httpWebRequest.Method = httpItem.Method.ToString();
                httpWebRequest.Headers = httpItem.Header;
                httpWebRequest.ContentType = HttpContentType.APPLICATION_JSON;
                httpWebRequest.Timeout = httpItem.TimeOut;
                if (httpItem.Method == RequestMethod.POST && (httpItem.RequestValue != null))
                {
                    httpWebRequest.ContentLength = httpItem.RequestValue.Length;
                    using (Stream requestStream = httpWebRequest.GetRequestStream())
                    {
                        requestStream.Write(httpItem.RequestValue, 0, httpItem.RequestValue.Length);
                    }
                }




                try
                {
                    //正常情况获取web服务器返回数据
                    var httpWebResponse = (System.Net.HttpWebResponse)httpWebRequest.GetResponse();
                    using (Stream responseStream = httpWebResponse.GetResponseStream())
                    {
                        MemoryStream memoryStream = new MemoryStream();
                        responseStream.CopyTo(memoryStream);

                        result.HttpByteData = memoryStream.ToArray();
                        memoryStream.Seek(0, SeekOrigin.Begin);

                        result.HttpStringData = (httpWebResponse.ContentEncoding != null && httpWebResponse.ContentEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase)) ? memoryStream.ReadGzipText(httpItem.Encoding) : memoryStream.ReadText(httpItem.Encoding);

                    }

                }
                catch (System.Net.WebException ex)
                {
                    Console.Write(ex.Message);//远程服务器返回错误: (400) 错误的请求。
                    var strResponse = GetResponseAsString((System.Net.HttpWebResponse)ex.Response, Encoding.UTF8);//这样获取web服务器返回数据
                    result.HttpStringData = strResponse;
                }


                return result;
            }
            catch (Exception ex)
            {
                result.Status = false;
                result.Msg = ex.Message;
                return result;
            }
        }


        private static string GetResponseAsString(HttpWebResponse res, Encoding encoding)
        {
            try
            {
                StreamReader sr = new StreamReader(res.GetResponseStream(), encoding);
                return sr.ReadToEnd();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return "GetResponseAsString catch";
            }
        }
    }

    public class HttpItem
    {

        /// <summary>
        /// Url地址
        /// </summary>
        private string url;
        public string Url
        {
            get
            {
                if (!url.ToLower().StartsWith("http"))
                {
                    url = "http://" + url;
                }
                return url;
            }
            set { url = value; }
        }

        /// <summary>
        /// Method
        /// </summary>
        public RequestMethod Method { get; set; } = RequestMethod.POST;

        /// <summary>
        /// 超时时间
        /// </summary>
        public int TimeOut { get; set; } = 1000 * 60;

        /// <summary>
        /// 接收的ContentType
        /// </summary>
        public string ContentType { get; set; } = HttpContentType.APPLICATION_JSON;

        /// <summary>
        /// 发送的ContentType
        /// </summary>
        public string HeaderContentType { get; set; } = HttpContentType.APPLICATION_JSON;

        /// <summary>
        /// 
        /// </summary>
        public string UserAgent { get; set; }

        /// <summary>
        /// 编码
        /// </summary>
        public Encoding Encoding { get; set; } = Encoding.UTF8;

        /// <summary>
        /// 发送的数据类型
        /// </summary>
        public RequesDataType RequestDataType { get; set; } = RequesDataType.Text;

        /// <summary>
        /// 发送的数据
        /// </summary>
        public object RequestData { get; set; }

        /// <summary>
        /// 根据数据类型转换数据
        /// </summary>
        public byte[] RequestValue
        {
            get
            {
                byte[] bytes = null;
                if (RequestData != null)
                {
                    switch (RequestDataType)
                    {
                        case RequesDataType.Text:
                            bytes = Encoding.GetBytes(RequestData.ToString());
                            //bytes = Encoding.UTF8.GetBytes(RequestData.ToString());
                            break;
                        case RequesDataType.StringText:
                            bytes = Encoding.GetBytes(Newtonsoft.Json.JsonConvert.SerializeObject(RequestData));
                            break;
                        case RequesDataType.Byte:
                            bytes = RequestData as byte[];
                            break;
                    }
                }
                return bytes;
            }
        }

        private WebHeaderCollection _header;
        /// <summary>
        /// 设置Header
        /// </summary>
        public WebHeaderCollection Header
        {
            get
            {
                if (_header == null)
                {
                    _header = new WebHeaderCollection();
                }

                //使用下面语句会出现异常 :error:必须使用适当的属性或方法修改“Content-Type”标头。
                //_header.Add(HttpResponseHeader.ContentType, HeaderContentType);
                return _header;
            }
            set { _header = value; }
        }

        public HttpItem(string url, RequesDataType requestDataType = RequesDataType.Text, object requestData = null)
        {
            Url = url;
            RequestDataType = requestDataType;
            RequestData = requestData;
        }
    }

    public class HttpResult
    {
        public bool Status { get; set; } = true;
        public string Msg { get; set; } = "Success";
        public string HttpStringData { get; set; }
        public byte[] HttpByteData { get; set; }
    }

    public enum RequestMethod
    {
        GET, POST
    }

    public enum RequesDataType
    {
        Text,

        // 如果WebApi设置接收类型为[FromBody]String,需将数据先转义为String
        // 如：SendData:"data", 转义:"\"data\""
        StringText,

        Byte
    }
}
/// <summary>
/// Stream扩展类
/// </summary>
public static class StreamEx
{

    /// <summary>
    /// 流转字符串
    /// </summary>
    /// <param name="stream"></param>
    /// <param name="encoding"></param>
    /// <returns></returns>
    public static string ReadText(this Stream stream, Encoding encoding)
    {
        string text = string.Empty;
        using (StreamReader streamReader = new StreamReader(stream, encoding))
        {
            text = streamReader.ReadToEnd();
        }
        return text;
    }

    /// <summary>
    /// 流转Gzip压缩字符串
    /// </summary>
    /// <param name="stream"></param>
    /// <param name="encoding"></param>
    /// <returns></returns>
    public static string ReadGzipText(this Stream stream, Encoding encoding)
    {
        string text = string.Empty;
        using (GZipStream gZipStream = new GZipStream(stream, CompressionMode.Decompress))
        {
            using (StreamReader reader = new StreamReader(gZipStream, encoding))
            {
                text = reader.ReadToEnd();
            }
        }
        return text;
    }
}



/// <summary>
/// HTTP 内容类型(Content-Type)
/// </summary>
public class HttpContentType
{
    /// <summary>
    /// 资源类型：普通文本
    /// </summary>
    public const string TEXT_PLAIN = "text/plain";

    /// <summary>
    /// 资源类型：JSON字符串
    /// </summary>
    public const string APPLICATION_JSON = "application/json";

    /// <summary>
    /// 资源类型：未知类型(数据流)
    /// </summary>
    public const string APPLICATION_OCTET_STREAM = "application/octet-stream";

    /// <summary>
    /// 资源类型：表单数据(键值对)
    /// </summary>
    public const string WWW_FORM_URLENCODED = "application/x-www-form-urlencoded";

    /// <summary>
    /// 资源类型：表单数据(键值对)。编码方式为 gb2312
    /// </summary>
    public const string WWW_FORM_URLENCODED_GB2312 = "application/x-www-form-urlencoded;charset=gb2312";

    /// <summary>
    /// 资源类型：表单数据(键值对)。编码方式为 utf-8
    /// </summary>
    public const string WWW_FORM_URLENCODED_UTF8 = "application/x-www-form-urlencoded;charset=utf-8";

    /// <summary>
    /// 资源类型：多分部数据
    /// </summary>
    public const string MULTIPART_FORM_DATA = "multipart/form-data";
}