Added Uninstall feature, made everything async c:

EZPPClient Installer/MainWindow.xaml.cs

@@ -61,11 +61,17 @@ namespace EZPPClient_Installer
       InstallerWindow.Title = "EZPPClient Installer " + versionString.Replace(",", ".");
 
       string osuPath = "";
-
+      bool isValidFolder = await isValidOsuFolder(osuPath);
       UpdateInstallButton(!string.IsNullOrEmpty(osuPath));
       
-      if (!string.IsNullOrEmpty(osuPath))
+      if(!string.IsNullOrEmpty(osuPath) && isValidFolder)
+      {
+        bool foundInstall = await isEZPPClientInstallationFound(osuPath);
+        if(foundInstall)
+          InstallButton.Content = "Uninstall";
+        
         folderTextbox.Text = osuPath;
+      }
       else
         await new ContentDialog()
         {
@@ -138,10 +144,24 @@ namespace EZPPClient_Installer
     private void UpdateInstallButton(bool enable)
     {
       InstallButton.IsEnabled = enable;
+      linkFoldersCheckbox.IsEnabled = enable;
     }
 
-    private void Install_Click(object sender, RoutedEventArgs e)
+    private async void Install_Click(object sender, RoutedEventArgs e)
     {
+      string osuFolder = folderTextbox.Text;
+      bool isValid = await isValidOsuFolder(osuFolder);
+      if (!isValid)
+      {
+        await new ContentDialog()
+        {
+          Title = "Hmmm..",
+          Content = "It seems like the selected folder is not a osu! installation.",
+          PrimaryButtonText = "Okay qwq"
+        }.ShowAsync();
+        return;
+      }
+      
       
     }
 
@@ -151,7 +171,7 @@ namespace EZPPClient_Installer
       e.Handled = true;
     }
 
-    private void Browse_Click(object sender, RoutedEventArgs e)
+    private async void Browse_Click(object sender, RoutedEventArgs e)
     {
       using (var fbd = new FolderBrowserDialog())
       {
@@ -159,48 +179,80 @@ namespace EZPPClient_Installer
 
         if (result == System.Windows.Forms.DialogResult.OK && !string.IsNullOrWhiteSpace(fbd.SelectedPath))
         {
-          string[] files = Directory.GetFiles(fbd.SelectedPath, "*");
+          bool isValid = await isValidOsuFolder(fbd.SelectedPath);
-          string[] subDirs = Directory.GetDirectories(fbd.SelectedPath, "*");
-          bool hasSongsFolder = false;
-          bool hasSkinsFolder = false;
-          bool hasOsuExecutable = false;
-          foreach(string file in files)
-          {
-            if (file.Contains("osu!.exe"))
-            {
-              hasOsuExecutable = true;
-              break;
-            }
-          }
 
-          foreach (string dir in subDirs)
+          if (!isValid)
           {
-            if (dir.Contains("Songs") && !hasSongsFolder)
+            await new ContentDialog()
-              hasSongsFolder = true;
-            if (dir.Contains("Skins") && !hasSkinsFolder)
-              hasSkinsFolder = true;
-
-            if (hasSkinsFolder && hasSongsFolder)
-              break;
-          }
-
-          if (!hasSongsFolder || !hasSkinsFolder || !hasOsuExecutable)
-          {
-            new ContentDialog()
             {
               Title = "Hmmm..",
-              Content = "It seems like this Folder is not a osu! Installation.",
+              Content = "It seems like this folder is not a osu! installation.",
               PrimaryButtonText = "Okay qwq"
             }.ShowAsync();
           }
           else
           {
+            bool foundInstall = await isEZPPClientInstallationFound(fbd.SelectedPath);
             folderTextbox.Text = fbd.SelectedPath;
+            
+            if(foundInstall)
+              InstallButton.Content = "Uninstall";
+            
             UpdateInstallButton(true);
           }
         }
       }
     }
+
+    private async Task<bool> isEZPPClientInstallationFound(string folder)
+    {
+      string[] subDirs = Directory.GetDirectories(folder, "*");
+      bool doesExist = false;
+      
+      foreach (string dir in subDirs)
+      {
+        if(dir.Contains("EZPPClient"))
+        {
+          doesExist = true;
+          break;
+        }
+      }
+
+      return doesExist;
+    }
+
+    private async Task<bool> isValidOsuFolder(string folder)
+    {
+      if(string.IsNullOrEmpty(folder) || string.IsNullOrWhiteSpace(folder))
+        return false;
+      string[] files = Directory.GetFiles(folder, "*");
+      string[] subDirs = Directory.GetDirectories(folder, "*");
+      bool hasSongsFolder = false;
+      bool hasSkinsFolder = false;
+      bool hasOsuExecutable = false;
+      foreach(string file in files)
+      {
+        if (file.Contains("osu!.exe"))
+        {
+          hasOsuExecutable = true;
+          break;
+        }
+      }
+
+      foreach (string dir in subDirs)
+      {
+        if (dir.Contains("Songs") && !hasSongsFolder)
+          hasSongsFolder = true;
+        if (dir.Contains("Skins") && !hasSkinsFolder)
+          hasSkinsFolder = true;
+
+        if (hasSkinsFolder && hasSongsFolder)
+          break;
+      }
+
+      return hasOsuExecutable && hasSkinsFolder && hasSongsFolder;
+    }
+    
     private enum SymbolicLink
     {
       File,