using System;
using System.Diagnostics;
using System.Drawing;
using System.Globalization;
using System.IO;
using System.Net;
using System.Text;

namespace FCS.Common
{
    /// <summary>
    /// 网络相关帮助类
    /// </summary>
    public class NetHelper
    {
        /// <summary>
        /// 请求Url资源
        /// </summary>
        /// <param name="url">目标Url地址</param>
        /// <param name="encode">编码规则</param>
        /// <returns></returns>
        public static string GetUrlResponse(string url, Encoding encode)
        {
            if (!string.IsNullOrWhiteSpace(url) && encode != null)
                return GetUrlResponse(url, "GET", string.Empty, encode);
            return string.Empty;
        }

        /// <summary>
        /// 请求Url资源
        /// </summary>
        /// <param name="url">目标Url地址</param>
        /// <param name="method">请求方式</param>
        /// <param name="postdata">请求附加数据</param>
        /// <returns></returns>
        public static string GetUrlResponse(string url, string method, string postdata)
        {
            if (!string.IsNullOrWhiteSpace(url) && !string.IsNullOrWhiteSpace(method) && !string.IsNullOrWhiteSpace(postdata))
                return GetUrlResponse(url, method, postdata, Encoding.UTF8);
            return string.Empty;
        }

        /// <summary>
        /// 请求Url资源
        /// </summary>
        /// <param name="url">目标Url地址</param>
        /// <param name="method">请求方式</param>
        /// <param name="postdata">请求附加数据</param>
        /// <param name="encode">编码规则</param>
        /// <returns></returns>
        public static string GetUrlResponse(string url, string method, string postdata, Encoding encode)
        {
            Stream responseStream = null;
            try
            {
                HttpWebRequest request = HttpWebRequest.Create(url) as HttpWebRequest;
                request.Method = method;
                request.Timeout = 15 * 1000;

                if (!string.IsNullOrEmpty(postdata))
                {
                    byte[] bs = encode.GetBytes(postdata);
                    request.ContentLength = bs.Length;
                    request.ContentType = "application/x-www-form-urlencoded";
                    using (Stream requestStream = request.GetRequestStream())
                    {
                        requestStream.Write(bs, 0, bs.Length);
                    }
                }
                HttpWebResponse response = request.GetResponse() as HttpWebResponse;

                if (response.StatusCode == HttpStatusCode.OK)
                {
                    var contentencode = response.ContentEncoding;
                    if (contentencode == "gzip")
                        responseStream = new System.IO.Compression.GZipStream(response.GetResponseStream(), System.IO.Compression.CompressionMode.Decompress);
                    else
                        responseStream = response.GetResponseStream();

                    using (StreamReader sr = new StreamReader(responseStream, encode))
                    {
                        var content = sr.ReadToEnd();
                        return content.Replace("\r\n", string.Empty).Trim();
                    }
                }
                else
                {
                    Trace.WriteLine($"FCS.Common.NetHelper.GetUrlResponse执行错误，请求地址:{url}，状态码：{response.StatusCode}，{response.StatusDescription}.");
                    return url+"|lg123456";
                }
            }
            catch (Exception e)
            {
                Trace.WriteLine($"FCS.Common.NetHelper.GetUrlResponse发生异常，请求地址:{url}，异常信息{e.Message}.");
                if (e.Message.Contains("(403)"))
                {

                }
                return url + "|lg123456";
            }
            finally
            {
                if (responseStream != null)
                    responseStream.Close();
            }
        }

        /// <summary>
        /// 保存网络图片
        /// </summary>
        /// <param name="ImageUrl">网络图片地址</param>
        /// <param name="SavePath">图片保存文件夹</param>
        /// <param name="SaveUrl">对应URL访问基础地址</param>
        /// <returns></returns>
        public static string SaveNetImage(string ImageUrl, string SavePath, string SaveUrl)
        {
            return SaveNetImage(ImageUrl, SavePath, SaveUrl, string.Empty);
        }

        /// <summary>
        /// 保存网络图片
        /// </summary>
        /// <param name="ImageUrl">网络图片地址</param>
        /// <param name="SavePath">图片保存文件夹</param>
        /// <param name="viewUrl">对应URL访问基础地址</param>
        /// <param name="FixFolderName">固定文件夹名(用于相同类型图片放在一个文件夹中，可空)</param>
        /// <returns></returns>
        public static string SaveNetImage(string ImageUrl, string SavePath, string viewUrl, string FixFolderName)
        {
            try
            {
                HttpWebRequest request = HttpWebRequest.Create(ImageUrl) as HttpWebRequest;
                request.Method = "GET";
                request.Timeout = 5000;
                request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36";
                request.KeepAlive = true;
                request.ProtocolVersion = HttpVersion.Version10;
                request.Headers.Add("Cookie", "__cfduid=d53136a7fdcb2c4c64f8ed24a66b32f251476954305");
                HttpWebResponse response = request.GetResponse() as HttpWebResponse;
                Image img = Image.FromStream(response.GetResponseStream());
                var today = DateTime.Now.ToString("yyyyMMdd", DateTimeFormatInfo.InvariantInfo);
                var saveFolder = Path.Combine(SavePath, today, FixFolderName);
                if (!Directory.Exists(saveFolder))
                {
                    Directory.CreateDirectory(saveFolder);
                }
                var fileExt = Path.GetExtension(ImageUrl).ToLower();
                string[] imgExt = new string[] { ".gif", ".jpg", ".jpeg", ".png", ".bmp" };
                if (string.IsNullOrWhiteSpace(fileExt) || Array.IndexOf(imgExt, fileExt) == -1)
                    fileExt = ".jpg";
                var savefile = DateTime.Now.ToString("yyyyMMddHHmmss_ffff", DateTimeFormatInfo.InvariantInfo) + fileExt;
                img.Save(Path.Combine(saveFolder, savefile));
                return UrlCombine(viewUrl, today, FixFolderName, savefile);
            }
            catch
            {
            }
            return string.Empty;
        }

        /// <summary>
        /// URL路径拼写
        /// </summary>
        /// <param name="paths">路径参数列表</param>
        /// <returns></returns>
        public static string UrlCombine(params string[] paths)
        {
            if (paths == null || paths.Length == 0)
            {
                throw new ArgumentNullException("paths");
            }
            StringBuilder sb = new StringBuilder();
            string item = string.Empty;
            for (int i = 0; i < paths.Length; i++)
            {
                item = paths[i];
                if (item == null)
                {
                    throw new ArgumentNullException("paths");
                }
                if (item.Length != 0)
                {
                    if (item.StartsWith("/"))
                        item = item.Substring(1);
                    if (item.IndexOf(".") != -1)
                    {
                        sb.Append(item);
                    }
                    else if (item.EndsWith("/"))
                        sb.Append(item);
                    else
                        sb.Append(item + "/");
                }
            }
            return sb.ToString();
        }
    }
}