Remember chat provider (#217)

app/MindWork AI Studio/Settings/ConfigurationSelectData.cs

@@ -25,6 +25,19 @@ public readonly record struct ConfigurationSelectData<T>(string Name, T Value);
 /// </summary>
 public static class ConfigurationSelectDataFactory
 {
+    public static IEnumerable<ConfigurationSelectData<LoadingChatProviderBehavior>> GetLoadingChatProviderBehavior()
+    {
+        yield return new("When possible, use the LLM provider which was used for each chat in the first place", LoadingChatProviderBehavior.USE_CHAT_PROVIDER_IF_AVAILABLE);
+        yield return new("Use the latest LLM provider, which was used before; use the default chat provider initially", LoadingChatProviderBehavior.ALWAYS_USE_LATEST_CHAT_PROVIDER);
+        yield return new("Always use the default chat provider when loading chats", LoadingChatProviderBehavior.ALWAYS_USE_DEFAULT_CHAT_PROVIDER);
+    }
+    
+    public static IEnumerable<ConfigurationSelectData<AddChatProviderBehavior>> GetAddChatProviderBehavior()
+    {
+        yield return new("Use the latest LLM provider, which was used before; use the default chat provider initially", AddChatProviderBehavior.ADDED_CHATS_USE_LATEST_PROVIDER);
+        yield return new("Always use the default chat provider for new chats", AddChatProviderBehavior.ADDED_CHATS_USE_DEFAULT_PROVIDER);
+    }
+    
     public static IEnumerable<ConfigurationSelectData<SendBehavior>> GetSendBehaviorData()
     {
         yield return new("No key is sending the input", SendBehavior.NO_KEY_IS_SENDING);

app/MindWork AI Studio/Settings/DataModel/AddChatProviderBehavior.cs

@@ -0,0 +1,7 @@
+namespace AIStudio.Settings.DataModel;
+
+public enum AddChatProviderBehavior
+{
+    ADDED_CHATS_USE_DEFAULT_PROVIDER = 0,
+    ADDED_CHATS_USE_LATEST_PROVIDER,
+}

app/MindWork AI Studio/Settings/DataModel/DataChat.cs

@@ -7,6 +7,16 @@ public sealed class DataChat
     /// </summary>
     public SendBehavior ShortcutSendBehavior { get; set; } = SendBehavior.ENTER_IS_SENDING;
 
+    /// <summary>
+    /// Defines the provider behavior for loading a chat.
+    /// </summary>
+    public LoadingChatProviderBehavior LoadingProviderBehavior { get; set; } = LoadingChatProviderBehavior.USE_CHAT_PROVIDER_IF_AVAILABLE;
+
+    /// <summary>
+    /// Defines the provider behavior when adding a chat.
+    /// </summary>
+    public AddChatProviderBehavior AddChatProviderBehavior { get; set; } = AddChatProviderBehavior.ADDED_CHATS_USE_LATEST_PROVIDER;
+
     /// <summary>
     /// Preselect any chat options?
     /// </summary>

app/MindWork AI Studio/Settings/DataModel/LoadingChatProviderBehavior.cs

@@ -0,0 +1,8 @@
+namespace AIStudio.Settings.DataModel;
+
+public enum LoadingChatProviderBehavior
+{
+    USE_CHAT_PROVIDER_IF_AVAILABLE = 0,
+    ALWAYS_USE_DEFAULT_CHAT_PROVIDER,
+    ALWAYS_USE_LATEST_CHAT_PROVIDER,
+}

app/MindWork AI Studio/Settings/SettingsManager.cs

@@ -131,7 +131,7 @@ public sealed class SettingsManager(ILogger<SettingsManager> logger)
         return minimumLevel;
     }
     
-    public Provider GetPreselectedProvider(Tools.Components component)
+    public Provider GetPreselectedProvider(Tools.Components component, string? chatProviderId = null)
     {
         var minimumLevel = this.GetMinimumConfidenceLevel(component);
         
@@ -139,6 +139,14 @@ public sealed class SettingsManager(ILogger<SettingsManager> logger)
         if (this.ConfigurationData.Providers.Count == 1 && this.ConfigurationData.Providers[0].UsedLLMProvider.GetConfidence(this).Level >= minimumLevel)
             return this.ConfigurationData.Providers[0];
 
+        // When there is a chat provider, and it has a confidence level that is high enough, we return it:
+        if (chatProviderId is not null && !string.IsNullOrWhiteSpace(chatProviderId))
+        {
+            var chatProvider = this.ConfigurationData.Providers.FirstOrDefault(x => x.Id == chatProviderId);
+            if (chatProvider.UsedLLMProvider.GetConfidence(this).Level >= minimumLevel)
+                return chatProvider;
+        }
+        
         // When there is a component-preselected provider, and it has a confidence level that is high enough, we return it:
         var preselectedProvider = component.PreselectedProvider(this);
         if(preselectedProvider != default && preselectedProvider.UsedLLMProvider.GetConfidence(this).Level >= minimumLevel)