using System;
using System.IO;
using System.Net;
using System.Text;
using System.Xml;
using System.Configuration;
using System.Web;
using System.Collections.Generic;
using Bowin.Common.Utility;
using Microsoft.AspNetCore.Http.Extensions;
using Microsoft.Extensions.Configuration;

namespace Bowin.Common
{
    internal class FileServerSettings
    {
        public string UserName { get; set; }
        public string Password { get; set; }
        public string Url { get; set; }
    }

	/// <summary>
	/// FileManager 的摘要说明。
	/// </summary>
	public class FileManager
	{
		public string ErrorMessage;
		private CredentialCache myCredentialCache;
		private FileServerSettings Settings;

		public FileManager()
		{
			this.ErrorMessage = "";
            var configuration = new ConfigurationBuilder()
                  .SetBasePath(Directory.GetCurrentDirectory())
                  .AddJsonFile("appsettings.json")
                  .Build();

            Settings = configuration.GetSection("FileServer").Get<FileServerSettings>();
			if (Settings.Url.Length > 0)
			{
				if (Settings.Url.Substring(Settings.Url.Length - 1, 1) != "/")
				{
					Settings.Url = Settings.Url + "/";
				}
			}
			this.myCredentialCache = new CredentialCache();
			this.myCredentialCache.Add(new Uri(Settings.Url), "NTLM", new NetworkCredential(Settings.UserName, Settings.Password));
		}

		public bool DeleteFile(string filename)
		{
			this.ErrorMessage = "";
			HttpWebRequest request = (HttpWebRequest) WebRequest.Create(Settings.Url + filename);
			request.Credentials = this.myCredentialCache;
			request.Method = "DELETE";
			WebResponse response = null;
			try
			{
				response = request.GetResponse();
			}
			catch (WebException ex)
			{
				this.ErrorMessage = ex.Message;
				return false;
			}
			finally
			{
				if (response != null)
				{
					response.Close();
				}
			}
			return true;
		}

		public bool IsFileExist(string filename)
		{
			this.ErrorMessage = "";
			string text1 = "<?xml version=\"1.0\"?><a:propfind xmlns:a=\"DAV:\"><a:prop><a:getcontentlength/></a:prop></a:propfind>";
			byte[] buffer1 = new ASCIIEncoding().GetBytes(text1);
			HttpWebRequest request = (HttpWebRequest) WebRequest.Create(Settings.Url + filename);
			request.Credentials = this.myCredentialCache;
			request.Method = "PROPFIND";
			request.ContentType = "text/xml";
			request.Headers.Add("Depth", "0");
			request.Headers.Add("Translate: f");
			request.ContentLength = buffer1.Length;
			Stream stream = request.GetRequestStream();
			stream.Write(buffer1, 0, buffer1.Length);
			stream.Close();
			WebResponse response = null;
			try
			{
				response = request.GetResponse();
			}
			catch (WebException ex)
			{
				if (ex.Message.IndexOf("404") == -1)
				{
					this.ErrorMessage = ex.Message;
					throw ex;
				}
				return false;
			}
			finally
			{
				if (response != null)
				{
					response.Close();
				}
			}
			return true;
		}

		public bool UploadFile(Stream inputStream, string filename)
		{
			this.ErrorMessage = "";
			WebClient client = new WebClient();
			client.Credentials = this.myCredentialCache;
			int num1 = (int)inputStream.Length;
			byte[] buffer1 = new byte[num1];
			inputStream.Read(buffer1, 0, num1);
			Stream stream = client.OpenWrite(Settings.Url + filename, "PUT");

			stream.Write(buffer1, 0, num1);
			try
			{

				stream.Close();
			}
			catch (WebException ex)
			{
				this.ErrorMessage = ex.Message;
				return false;
			}
			return true;
		}

		public bool UploadFile(byte[] buffer, string filename)
		{
			this.ErrorMessage = "";
			WebClient client = new WebClient();
			client.Credentials = this.myCredentialCache;

			Stream stream = client.OpenWrite(Settings.Url + filename, "PUT");

            stream.Write(buffer, 0, buffer.Length);
			try
			{
				stream.Close();
			}
			catch (WebException ex)
			{
				this.ErrorMessage = ex.Message;
				return false;
			}
			return true;
		}

		public Stream ReadFile(string FileName)
		{
			Stream stream  =  System.IO.File.OpenRead(FileName);
			return stream;
		}

        /// <summary>
        /// 下载文件服务器中的文件
        /// </summary>
        /// <param name="virtualFilePath">目标文件的虚拟路径</param>
        /// <param name="remoteFile">远程文件地址</param>
        public static void DownloadFile(string virtualFilePath, string remoteFile)
        {
            WebClient conn = new WebClient();
            var targetFile = remoteFile;

            File.Delete(HttpHelper.MapPath(virtualFilePath));
            if (!remoteFile.Trim().StartsWith("http") && !remoteFile.Trim().Contains("://"))
            {
                targetFile = new Uri(HttpHelper.Current.Request.GetDisplayUrl()).GetLeftPart(UriPartial.Authority);
                if (!remoteFile.StartsWith("/"))
                {
                    targetFile += "/";
                }
                targetFile += remoteFile;
            }
            conn.DownloadFile(targetFile, HttpHelper.MapPath(virtualFilePath));
        }
	}
}