Added initial try for autoupdating

Author: Sebski123

YARDT/App.xaml

@@ -1,8 +1,7 @@
 <Application x:Class="YARDT.App"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             xmlns:local="clr-namespace:YARDT"
-             StartupUri="MainWindow.xaml">
+             Startup="Application_Startup">
     <Application.Resources>
 
     </Application.Resources>

YARDT/App.xaml.cs

@@ -13,5 +13,12 @@ namespace YARDT
     /// </summary>
     public partial class App : Application
     {
+        private async void Application_Startup(object sender, StartupEventArgs e)
+        {
+            await Task.Run(async () => await Updater.Run());
+
+            MainWindow window = new MainWindow();
+            window.Show();
+        }
     }
 }

YARDT/Classes/Updater.cs

@@ -0,0 +1,144 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace YARDT.Classes
+{
+    class Updater
+    {
+        private static readonly string APILatestURL = "https://api.github.com/repos/Assistant/ModAssistant/releases/latest";
+
+        private static Update LatestUpdate;
+        private static Version CurrentVersion;
+        private static Version LatestVersion;
+        private static bool NeedsUpdate = false;
+        private static string NewExe = Path.Combine(Path.GetDirectoryName(Utils.ExePath), "ModAssistant.exe");
+
+        public static async Task<bool> CheckForUpdate()
+        {
+            var resp = await HttpClient.GetAsync(APILatestURL);
+            var body = await resp.Content.ReadAsStringAsync();
+            LatestUpdate = JsonSerializer.Deserialize<Update>(body);
+
+            LatestVersion = new Version(LatestUpdate.tag_name.Substring(1));
+            CurrentVersion = new Version(App.Version);
+
+            return (LatestVersion > CurrentVersion);
+        }
+
+        public static async Task Run()
+        {
+            if (Path.GetFileName(Utils.ExePath).Equals("ModAssistant.old.exe")) RunNew();
+            try
+            {
+                NeedsUpdate = await CheckForUpdate();
+            }
+            catch
+            {
+                Console.WriteLine("Updater:CheckFailed");
+            }
+
+            if (NeedsUpdate) await StartUpdate();
+        }
+
+        public static async Task StartUpdate()
+        {
+            string OldExe = Path.Combine(Path.GetDirectoryName(Utils.ExePath), "ModAssistant.old.exe");
+            string DownloadLink = null;
+
+            foreach (Update.Asset asset in LatestUpdate.assets)
+            {
+                if (asset.name == "ModAssistant.exe")
+                {
+                    DownloadLink = asset.browser_download_url;
+                }
+            }
+
+            if (string.IsNullOrEmpty(DownloadLink))
+            {
+                Console.WriteLine("Updater:DownloadFailed");
+            }
+            else
+            {
+                if (File.Exists(OldExe))
+                {
+                    File.Delete(OldExe);
+                }
+
+                File.Move(Utils.ExePath, OldExe);
+
+                await Utils.Download(DownloadLink, NewExe);
+                RunNew();
+            }
+        }
+
+        private static void RunNew()
+        {
+            Process.Start(NewExe);
+            Application.Current.Dispatcher.Invoke(() => { Application.Current.Shutdown(); });
+        }
+    }
+    public class Update
+    {
+        public string url;
+        public string assets_url;
+        public string upload_url;
+        public string html_url;
+        public int id;
+        public string node_id;
+        public string tag_name;
+        public string target_commitish;
+        public string name;
+        public bool draft;
+        public User author;
+        public bool prerelease;
+        public string created_at;
+        public string published_at;
+        public Asset[] assets;
+        public string tarball_url;
+        public string zipball_url;
+        public string body;
+
+        public class Asset
+        {
+            public string url;
+            public int id;
+            public string node_id;
+            public string name;
+            public string label;
+            public User uploader;
+            public string content_type;
+            public string state;
+            public int size;
+            public string created_at;
+            public string updated_at;
+            public string browser_download_url;
+        }
+
+        public class User
+        {
+            public string login;
+            public int id;
+            public string node_id;
+            public string avatar_url;
+            public string gravatar_id;
+            public string url;
+            public string html_url;
+            public string followers_url;
+            public string following_url;
+            public string gists_url;
+            public string starred_url;
+            public string subscriptions_url;
+            public string organizations_url;
+            public string repos_url;
+            public string events_url;
+            public string received_events_url;
+            public string type;
+            public bool site_admin;
+
+        }
+    }
+}