Added instance name validation

app/MindWork AI Studio/Components/Pages/Settings.razor.cs

@@ -31,8 +31,13 @@ public partial class Settings : ComponentBase
     
     private async Task AddProvider()
     {
+        var dialogParameters = new DialogParameters<ProviderDialog>
+        {
+            { x => x.UsedInstanceNames, this.Providers.Select(x => x.InstanceName.ToLowerInvariant()).ToList() },
+        };
+
         var dialogOptions = new DialogOptions { CloseOnEscapeKey = true, FullWidth = true, MaxWidth = MaxWidth.Medium };
-        var dialogReference = await this.DialogService.ShowAsync<ProviderDialog>("Add Provider", dialogOptions);
+        var dialogReference = await this.DialogService.ShowAsync<ProviderDialog>("Add Provider", dialogParameters, dialogOptions);
         var dialogResult = await dialogReference.Result;
         if (dialogResult.Canceled)
             return;

app/MindWork AI Studio/Settings/ProviderDialog.razor

@@ -4,6 +4,7 @@
 <MudDialog>
     <DialogContent>
         <MudForm @ref="@this.form" @bind-IsValid="@this.dataIsValid" @bind-Errors="@this.dataIssues">
+            @* ReSharper disable once CSharpWarnings::CS8974 *@
             <MudTextField
                 T="string"
                 @bind-Text="@this.dataInstanceName"
@@ -12,7 +13,8 @@
                 AdornmentIcon="@Icons.Material.Filled.Lightbulb"
                 AdornmentColor="Color.Info"
                 Required="@true"
-                RequiredError="Please add an instance name."
+                RequiredError="Please enter an instance name."
+                Validation="@this.ValidatingInstanceName"
             />
             
             @* ReSharper disable once CSharpWarnings::CS8974 *@

app/MindWork AI Studio/Settings/ProviderDialog.razor.cs

@@ -1,3 +1,5 @@
+using System.Text.RegularExpressions;
+
 using AIStudio.Provider;
 
 using Microsoft.AspNetCore.Components;
@@ -10,6 +12,9 @@ public partial class ProviderDialog : ComponentBase
 {
     [CascadingParameter]
     private MudDialogInstance MudDialog { get; set; } = null!;
+    
+    [Parameter]
+    public IList<string> UsedInstanceNames { get; set; } = new List<string>();
 
     private bool dataIsValid;
     private string[] dataIssues = [];
@@ -41,6 +46,31 @@ public partial class ProviderDialog : ComponentBase
         
         return null;
     }
+    
+    private string? ValidatingInstanceName(string instanceName)
+    {
+        if(instanceName.StartsWith(' '))
+            return "The instance name must not start with a space.";
+        
+        if(instanceName.EndsWith(' '))
+            return "The instance name must not end with a space.";
+        
+        // The instance name must only contain letters, numbers, and spaces:
+        if (!InstanceNameRegex().IsMatch(instanceName))
+            return "The instance name must only contain letters, numbers, and spaces.";
+        
+        if(instanceName.Contains("  "))
+            return "The instance name must not contain consecutive spaces.";
+        
+        // The instance name must be unique:
+        if (this.UsedInstanceNames.Contains(instanceName.ToLowerInvariant()))
+            return "The instance name must be unique; the chosen name is already in use.";
+        
+        return null;
+    }
 
     private void Cancel() => this.MudDialog.Cancel();
+    
+    [GeneratedRegex("^[a-zA-Z0-9 ]+$")]
+    private static partial Regex InstanceNameRegex();
 }