Added the guided chat to the BeyondFacts Lab (#1177)

app/MindWork AI Studio/Assistants/BeyondFactsLab/BeyondFactsLabAssistant.razor.Provider.cs

@@ -0,0 +1,69 @@
+using AIStudio.Chat;
+using AIStudio.Provider;
+using AIStudio.Settings;
+
+namespace AIStudio.Assistants.BeyondFactsLab;
+
+public partial class BeyondFactsLabAssistant
+{
+    /// <summary>
+    /// The provider for the chats of the preparation shown, or none.
+    /// </summary>
+    private AIStudio.Settings.Provider providerSettings = AIStudio.Settings.Provider.NONE;
+
+    /// <summary>
+    /// Chooses the provider of a preparation as it opens: the one the person chose for it, as long as its confidence
+    /// is still high enough, otherwise the preselected one.
+    /// </summary>
+    /// <param name="project">The preparation, or null when none is shown.</param>
+    private void ResolveProvider(BflProject? project)
+    {
+        this.providerSettings = project is null
+            ? AIStudio.Settings.Provider.NONE
+            : this.SettingsManager.GetPreselectedProvider(Tools.Components.BEYOND_FACTS_LAB_ASSISTANT, project.ProviderId);
+    }
+
+    /// <summary>
+    /// Takes over the provider the person chose and remembers it for the preparation.
+    /// </summary>
+    /// <param name="provider">The provider.</param>
+    private async Task SelectProviderAsync(AIStudio.Settings.Provider provider)
+    {
+        this.providerSettings = provider;
+        if (provider == AIStudio.Settings.Provider.NONE || this.ValidateProvider(provider) is not null)
+            return;
+
+        if (this.selectedProject?.Project is not { } project || project.ProviderId == provider.Id)
+            return;
+
+        try
+        {
+            this.ReplaceProject(await this.Store.SetProviderAsync(project.ProjectId, provider.Id));
+        }
+        catch (Exception exception) when (exception is IOException or UnauthorizedAccessException or InvalidDataException)
+        {
+            // The choice holds while the page is open; only the next opening falls back to the preselected provider:
+            this.Logger.LogWarning(exception, "Could not remember the provider of a preparation in the BeyondFacts Lab.");
+        }
+    }
+
+    /// <summary>
+    /// Checks whether a provider can run the chats of the lab.
+    /// </summary>
+    /// <remarks>
+    /// The confidence is checked before: the selection offers only providers whose confidence is high enough.
+    /// </remarks>
+    /// <param name="provider">The provider.</param>
+    /// <returns>Why the provider cannot run the chats, or null when it can.</returns>
+    private string? ValidateProvider(AIStudio.Settings.Provider provider)
+    {
+        if (provider.UsedLLMProvider is LLMProviders.NONE)
+            return TA("Please select a provider.");
+
+        var contextWindow = provider.GetModelProfile().Context;
+        if (!BflModelRequirements.HasEnoughContext(contextWindow))
+            return string.Format(Culture, TA("The model of this provider reads at most {0} tokens at once. The lab needs at least {1}, because its guide alone takes about 20,000. Please select another provider."), TokenAmount.Format(contextWindow.DefaultTokens, Culture), TokenAmount.Format(BflModelRequirements.MINIMUM_CONTEXT_TOKENS, Culture));
+
+        return null;
+    }
+}