using System;
using System.Collections;
using System.Globalization;
using System.IO;
using System.Net;
using System.Text;
using System.Windows.Forms;
using System.Xml;

namespace Microsoft.Samples.AppUpdater
{
	public class WebFileLoader
	{
		internal delegate void NotifyUpdateFileInfoEventHandler(object sender, NotifyUpdateFileInfoEventArgs e);

		private static NotifyUpdateFileInfoEventArgs UpdateFileInfoEventArgs;

		internal static event NotifyUpdateFileInfoEventHandler OnNotifyUpdateFileInfo;

		public static bool CheckForFileUpdate(string url, string filePath)
		{
			HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
			httpWebRequest.Method = "HEAD";
			httpWebRequest.Credentials = CredentialCache.DefaultCredentials;
			HttpWebResponse httpWebResponse;
			try
			{
				httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
			}
			catch (WebException ex)
			{
				if (ex.Response == null)
				{
					throw;
				}
				HttpWebResponse httpWebResponse2 = (HttpWebResponse)ex.Response;
				if (httpWebResponse2.StatusCode != HttpStatusCode.NotModified)
				{
					ex.Response.Close();
					throw;
				}
				ex.Response.Close();
				return false;
			}
			httpWebResponse.Close();
			return true;
		}

		public static void UpdateFile(string url, string filePath)
		{
			HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
			httpWebRequest.Headers.Add("Translate: f");
			httpWebRequest.Credentials = CredentialCache.DefaultCredentials;
			if (File.Exists(filePath))
			{
				httpWebRequest.IfModifiedSince = LastModFromDisk(filePath);
			}
			HttpWebResponse httpWebResponse;
			try
			{
				httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
			}
			catch (WebException ex)
			{
				if (ex.Response == null)
				{
					throw;
				}
				HttpWebResponse httpWebResponse2 = (HttpWebResponse)ex.Response;
				if (httpWebResponse2.StatusCode == HttpStatusCode.NotModified)
				{
					ex.Response.Close();
					return;
				}
				ex.Response.Close();
				throw;
			}
			Stream stream = null;
			try
			{
				stream = httpWebResponse.GetResponseStream();
				CopyStreamToDisk(stream, filePath);
				DateTime lastWriteTime = Convert.ToDateTime(httpWebResponse.GetResponseHeader("Last-Modified"));
				File.SetLastWriteTime(filePath, lastWriteTime);
			}
			catch (Exception)
			{
				throw;
			}
			finally
			{
				stream?.Close();
				httpWebResponse?.Close();
			}
		}

		public static int CopyDirectory(string url, string filePath, int fileTotal, bool bReport)
		{
			int num = 0;
			SortedList directoryContents = GetDirectoryContents(url, deep: false);
			foreach (object item in directoryContents)
			{
				Resource resource = (Resource)((DictionaryEntry)item).Value;
				if (fileTotal != 0 && !Directory.Exists(filePath))
				{
					Directory.CreateDirectory(filePath);
				}
				if (!resource.IsFolder)
				{
					num++;
					string text = filePath + resource.Name;
					if (fileTotal != 0 && (!File.Exists(text) || resource.LastModified > LastModFromDisk(text)))
					{
						if (bReport && WebFileLoader.OnNotifyUpdateFileInfo != null)
						{
							if (UpdateFileInfoEventArgs == null)
							{
								UpdateFileInfoEventArgs = new NotifyUpdateFileInfoEventArgs();
							}
							UpdateFileInfoEventArgs.FileTotal = fileTotal;
							UpdateFileInfoEventArgs.FileName = filePath;
							UpdateFileInfoEventArgs.CurrentFile = num;
							WebFileLoader.OnNotifyUpdateFileInfo(null, UpdateFileInfoEventArgs);
						}
						UpdateFile(resource.Url, text);
					}
				}
				else
				{
					string text = filePath + resource.Name + "\\";
					num += CopyDirectory(resource.Url, text, fileTotal, bReport: true);
				}
			}
			return num;
		}

		public static SortedList GetDirectoryContents(string url, bool deep)
		{
			HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
			httpWebRequest.Headers.Add("Translate: f");
			httpWebRequest.Credentials = CredentialCache.DefaultCredentials;
			string text = "<?xml version=\"1.0\" encoding=\"utf-8\" ?><a:propfind xmlns:a=\"DAV:\"><a:prop><a:displayname/><a:iscollection/><a:getlastmodified/></a:prop></a:propfind>";
			httpWebRequest.Method = "PROPFIND";
			if (deep)
			{
				httpWebRequest.Headers.Add("Depth: infinity");
			}
			else
			{
				httpWebRequest.Headers.Add("Depth: 1");
			}
			httpWebRequest.ContentLength = text.Length;
			httpWebRequest.ContentType = "text/xml";
			Stream requestStream = httpWebRequest.GetRequestStream();
			requestStream.Write(Encoding.ASCII.GetBytes(text), 0, Encoding.ASCII.GetBytes(text).Length);
			requestStream.Close();
			StreamReader streamReader;
			try
			{
				HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
				streamReader = new StreamReader(httpWebResponse.GetResponseStream());
			}
			catch (WebException ex)
			{
				throw ex;
			}
			StringBuilder stringBuilder = new StringBuilder();
			char[] array = new char[1024];
			int num = 0;
			for (num = streamReader.Read(array, 0, 1024); num > 0; num = streamReader.Read(array, 0, 1024))
			{
				stringBuilder.Append(array, 0, num);
			}
			streamReader.Close();
			XmlDocument xmlDocument = new XmlDocument();
			xmlDocument.LoadXml(stringBuilder.ToString());
			XmlNamespaceManager xmlNamespaceManager = new XmlNamespaceManager(xmlDocument.NameTable);
			xmlNamespaceManager.AddNamespace("a", "DAV:");
			XmlNodeList xmlNodeList = xmlDocument.SelectNodes("//a:prop/a:displayname", xmlNamespaceManager);
			XmlNodeList xmlNodeList2 = xmlDocument.SelectNodes("//a:prop/a:iscollection", xmlNamespaceManager);
			XmlNodeList xmlNodeList3 = xmlDocument.SelectNodes("//a:prop/a:getlastmodified", xmlNamespaceManager);
			XmlNodeList xmlNodeList4 = xmlDocument.SelectNodes("//a:href", xmlNamespaceManager);
			SortedList sortedList = new SortedList();
			for (int i = 1; i < xmlNodeList.Count; i++)
			{
				if (xmlNodeList4[i].InnerText.ToLower(new CultureInfo("en-US")).TrimEnd('/') != url.ToLower(new CultureInfo("en-US")).TrimEnd('/'))
				{
					Resource resource = new Resource();
					resource.Name = xmlNodeList[i].InnerText;
					resource.IsFolder = Convert.ToBoolean(Convert.ToInt32(xmlNodeList2[i].InnerText));
					resource.Url = xmlNodeList4[i].InnerText;
					resource.LastModified = Convert.ToDateTime(xmlNodeList3[i].InnerText);
					sortedList.Add(resource.Url, resource);
				}
			}
			return sortedList;
		}

		public static void UpdateFileList(SortedList fileList, string sourceUrl, string destPath)
		{
			if (!Directory.Exists(destPath))
			{
				Directory.CreateDirectory(destPath);
			}
			foreach (object file in fileList)
			{
				Resource resource = (Resource)((DictionaryEntry)file).Value;
				string url = sourceUrl + resource.Name;
				string filePath = destPath + resource.Name;
				UpdateFile(url, filePath);
			}
		}

		public static DateTime GetLastModTime(string url)
		{
			HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
			httpWebRequest.Method = "HEAD";
			HttpWebResponse httpWebResponse;
			try
			{
				httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
			}
			catch (WebException ex)
			{
				if (ex.Response != null)
				{
					ex.Response.Close();
				}
				throw;
			}
			return Convert.ToDateTime(httpWebResponse.GetResponseHeader("Last-Modified"));
		}

		public static Stream LoadFile(string url)
		{
			HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
			HttpWebResponse httpWebResponse;
			try
			{
				httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
			}
			catch (WebException)
			{
				throw;
			}
			return httpWebResponse.GetResponseStream();
		}

		public static bool CheckForFileUpdate(string url, DateTime lastModeTime)
		{
			HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
			httpWebRequest.Method = "HEAD";
			httpWebRequest.IfModifiedSince = lastModeTime;
			HttpWebResponse httpWebResponse;
			try
			{
				httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
			}
			catch (WebException ex)
			{
				if (ex.Response == null)
				{
					throw;
				}
				HttpWebResponse httpWebResponse2 = (HttpWebResponse)ex.Response;
				if (httpWebResponse2.StatusCode != HttpStatusCode.NotModified)
				{
					ex.Response.Close();
					throw;
				}
				ex.Response.Close();
				return false;
			}
			httpWebResponse.Close();
			return true;
		}

		public static int GetFileCount(string filePath)
		{
			string[] directories = Directory.GetDirectories(filePath);
			string[] files = Directory.GetFiles(filePath);
			int num = 0;
			num = files.Length + directories.Length;
			string[] array = directories;
			foreach (string text in array)
			{
				string str = text.Remove(0, text.LastIndexOf("\\") + 1);
				num += GetFileCount(filePath + str + "\\");
			}
			return num;
		}

		private static void CopyStreamToDisk(Stream responseStream, string filePath)
		{
			byte[] buffer = new byte[4096];
			Random random = new Random();
			string str = Environment.GetEnvironmentVariable("temp") + "\\";
			str += filePath.Remove(0, filePath.LastIndexOf("\\") + 1);
			str = str + random.Next(10000).ToString() + ".tmp";
			FileStream fileStream = File.Open(str, FileMode.Create, FileAccess.ReadWrite);
			for (int num = responseStream.Read(buffer, 0, 4096); num > 0; num = responseStream.Read(buffer, 0, 4096))
			{
				fileStream.Write(buffer, 0, num);
			}
			fileStream.Close();
			if (File.Exists(filePath))
			{
				File.Delete(filePath);
			}
			File.Move(str, filePath);
		}

		public static DateTime LastModFromDisk(string filePath)
		{
			FileInfo fileInfo = new FileInfo(filePath);
			return fileInfo.LastWriteTime;
		}

		public static void CopyAndRename(string source, string dest)
		{
			string[] directories = Directory.GetDirectories(source);
			string[] files = Directory.GetFiles(source);
			if (!Directory.Exists(dest))
			{
				Directory.CreateDirectory(dest);
			}
			string[] array = files;
			foreach (string text in array)
			{
				string text2 = text.Remove(0, text.LastIndexOf("\\") + 1);
				MessageBox.Show(text2);
				if (File.Exists(dest + text2))
				{
					File.Delete(dest + text2);
				}
				File.Move(text, dest + text2);
			}
			string[] array2 = directories;
			foreach (string text3 in array2)
			{
				string text2 = text3.Remove(0, text3.LastIndexOf("\\") + 1);
				MessageBox.Show(text2);
				if (!Directory.Exists(dest + text2 + "\\"))
				{
					Directory.CreateDirectory(dest + text2 + "\\");
				}
				CopyAndRename(source + text2 + "\\", dest + text2 + "\\");
			}
			Directory.Delete(source, recursive: true);
		}

		public static string CreateHttpsUrl(string url)
		{
			url = url.ToLower(new CultureInfo("en-US"));
			if (url.StartsWith("https"))
			{
				return url;
			}
			return url.Insert(4, "s");
		}
	}
}