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

namespace HXX.Scanner.Biz
{
    /// <summary>
    /// http工具
    /// </summary>
    public partial class http_helper
    {
        /// <summary>
        /// 同时带参数和文件的post
        /// </summary>
        /// <param name="url">url</param>
        /// <param name="file_list">文件路径列表</param>
        /// <param name="paramName">文件参数名</param>
        /// <param name="contentType">文件类型</param>
        /// <param name="nvc">普通参数列表</param>
        /// <returns></returns>
        public static string HttpUploadFile(string url, List<string> file_list, string paramName, string contentType, string token, NameValueCollection nvc)
        {
            string result = string.Empty;

            string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
            byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");

            HttpWebRequest wr = (HttpWebRequest)WebRequest.Create(url);
            wr.ContentType = "multipart/form-data; boundary=" + boundary;
            wr.Method = "POST";
            wr.KeepAlive = true;
            wr.Credentials = System.Net.CredentialCache.DefaultCredentials;
            wr.Headers.Add("Authorization:" + token);

            Stream rs = wr.GetRequestStream();

            string formdataTemplate = "Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}";
            foreach (string key in nvc.Keys)
            {
                rs.Write(boundarybytes, 0, boundarybytes.Length);
                string formitem = string.Format(formdataTemplate, key, nvc[key]);
                byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);
                rs.Write(formitembytes, 0, formitembytes.Length);
            }
            rs.Write(boundarybytes, 0, boundarybytes.Length);

            foreach (var file in file_list)
            {
                //string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: {2};\r\naccess_token:\"{3}\"\r\n\r\n";
                string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\";\r\nContent-Type: {2};\"\r\nAuthorization: {3};\r\n\r\n";
                string header = string.Format(headerTemplate, paramName, file, contentType, token);
                byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
                rs.Write(headerbytes, 0, headerbytes.Length);

                FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read);
                byte[] buffer = new byte[4096];
                int bytesRead = 0;
                while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
                {
                    rs.Write(buffer, 0, bytesRead);
                }
                fileStream.Close();

                byte[] trailer = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");
                rs.Write(trailer, 0, trailer.Length);
            }

            rs.Close();

            WebResponse wresp = null;

            try
            {
                wresp = wr.GetResponse();
                Stream stream2 = wresp.GetResponseStream();
                StreamReader reader2 = new StreamReader(stream2);

                result = reader2.ReadToEnd();
            }
            catch (Exception ee)
            {
                string msg = ee.Message + Environment.NewLine + Environment.NewLine;

                msg += "URL:" + url + Environment.NewLine + "Method:POST" + Environment.NewLine +
                    "Content:" + "" + Environment.NewLine;

                System.Net.WebException webEE = ee as System.Net.WebException;

                if (webEE != null && webEE.Response != null)
                {
                    using (System.IO.Stream st = webEE.Response.GetResponseStream())
                    {
                        using (System.IO.StreamReader sr = new System.IO.StreamReader(st, Encoding.UTF8))
                        {
                            string webmsg = sr.ReadToEnd();

                            msg += Environment.NewLine + Environment.NewLine + webmsg;
                        }
                    }
                }

                throw new Exception(msg);
            }
            finally
            {
                wr = null;
            }

            return result;
        }

        /// <summary>
        /// 同时带参数和文件的post
        /// </summary>
        /// <param name="url">url</param>
        /// <param name="file_list">文件路径列表</param>
        /// <param name="paramName">文件参数名</param>
        /// <param name="contentType">文件类型</param>
        /// <param name="nvc">普通参数列表</param>
        /// <returns></returns>
        public static string HttpUploadFile2(string url, List<string> file_list, string paramName, string contentType, string token, NameValueCollection nvc)
        {
            string result = string.Empty;

            string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
            byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");

            HttpWebRequest wr = (HttpWebRequest)WebRequest.Create(url);
            wr.ContentType = "multipart/form-data; boundary=" + boundary;
            wr.Method = "POST";
            wr.KeepAlive = true;
            wr.Credentials = System.Net.CredentialCache.DefaultCredentials;
            wr.Headers.Add("Authorization:" + token);

            Stream rs = wr.GetRequestStream();

            string formdataTemplate = "Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}";
            foreach (string key in nvc.Keys)
            {
                rs.Write(boundarybytes, 0, boundarybytes.Length);
                string formitem = string.Format(formdataTemplate, key, nvc[key]);
                byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);
                rs.Write(formitembytes, 0, formitembytes.Length);
            }          

            foreach (var file in file_list)
            {
                rs.Write(boundarybytes, 0, boundarybytes.Length);

                string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\n\r\n";
                string header = string.Format(headerTemplate, paramName, file);
                byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
                rs.Write(headerbytes, 0, headerbytes.Length);

                FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read);
                byte[] buffer = new byte[4096];
                int bytesRead = 0;
                while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
                {
                    rs.Write(buffer, 0, bytesRead);
                }
                fileStream.Close();
            }

            byte[] trailer = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");
            rs.Write(trailer, 0, trailer.Length);

            rs.Close();

            WebResponse wresp = null;

            try
            {
                wresp = wr.GetResponse();
                Stream stream2 = wresp.GetResponseStream();
                StreamReader reader2 = new StreamReader(stream2);

                result = reader2.ReadToEnd();
            }
            catch (Exception ee)
            {
                string msg = ee.Message + Environment.NewLine + Environment.NewLine;

                msg += "URL:" + url + Environment.NewLine + "Method:POST" + Environment.NewLine +
                    "Content:" + "" + Environment.NewLine;

                System.Net.WebException webEE = ee as System.Net.WebException;

                if (webEE != null && webEE.Response != null)
                {
                    using (System.IO.Stream st = webEE.Response.GetResponseStream())
                    {
                        using (System.IO.StreamReader sr = new System.IO.StreamReader(st, Encoding.UTF8))
                        {
                            string webmsg = sr.ReadToEnd();

                            msg += Environment.NewLine + Environment.NewLine + webmsg;
                        }
                    }
                }

                throw new Exception(msg);
            }
            finally
            {
                wr = null;
            }

            return result;
        }
    }
}