refactor for better support of streaming and etc ...

Providers/XAIServiceBase.cs

@@ -47,7 +47,7 @@ namespace xAiApi.Providers
         /// <param name="prompt"></param>
         /// <param name="cancellationToken"></param>
         /// <returns></returns>
-        public virtual async Task<string> AskAsync(
+        public virtual async Task<string> AskTextAsync(
             string prompt,
             CancellationToken cancellationToken = default
         )
@@ -81,10 +81,6 @@ namespace xAiApi.Providers
             // Retrieve Response Text ...
             var result = response.Text;
 
-            //
-            // Dispose Client ...
-            client.Dispose();
-
             //
             return result;
         }
@@ -95,7 +91,7 @@ namespace xAiApi.Providers
         /// <param name="prompt"></param>
         /// <param name="cancellationToken"></param>
         /// <returns></returns>
-        public virtual async IAsyncEnumerable<string> AskAsEnumerable(
+        public virtual async IAsyncEnumerable<string> AskTextAsEnumerable(
             string prompt,
             [EnumeratorCancellation]
             CancellationToken cancellationToken = default
@@ -117,7 +113,6 @@ namespace xAiApi.Providers
             );
 
             //
-            var result = "";
             await foreach (var res in enumerable)
             {
                 //
@@ -128,15 +123,8 @@ namespace xAiApi.Providers
                 }
 
                 //
-                result += res.Text;
+                yield return res.Text;
             }
-
-            //
-            // Dispose Client ...
-            client.Dispose();
-
-            //
-            yield return result;
         }
 
         /// <summary>
@@ -172,6 +160,7 @@ namespace xAiApi.Providers
                     var ollamaClient = new OllamaApiClient(httpClient, model);
                     result =
                         new ChatClientBuilder(ollamaClient)
+                        .UseFunctionInvocation()
                         .Build();
                     break;
                 
@@ -188,9 +177,12 @@ namespace xAiApi.Providers
                         }
                     );
                     result =
-                        openAiClient
-                        .GetChatClient(model)
-                        .AsIChatClient();
+                        new ChatClientBuilder(
+                            openAiClient
+                            .GetChatClient(model)
+                        .AsIChatClient())
+                        .UseFunctionInvocation()
+                        .Build();
                     break;
 
                 //
@@ -206,29 +198,6 @@ namespace xAiApi.Providers
                     break;
             }
 
-            // //
-            // if (isOllamaBased)
-            // {
-            // }
-            // else if (isDeepSeekBased)
-            // {
-            //     //
-            //     if (apiKey is null ||
-            //         string.IsNullOrWhiteSpace(apiKey))
-            //     {
-            //         throw new Exception("Inavlid Args ...");
-            //     }
-
-            //     //
-            //     var deepseekClient = new DeepSeekChatClient(apiKey: apiKey);
-            //     result = deepseekClient;
-            // }
-            // else
-            // {
-            //     //
-            //     // TODO: Implement this ...
-            // }
-
             //
             if (result.IsNullOrDefault())
             {
@@ -330,7 +299,7 @@ namespace xAiApi.Providers
             // Preparing Introduction Prompt ...
             var introductionPrompt = new ChatMessage(
                 ChatRole.System,
-                configuration.GetPrompt()
+                configuration.GetPrompt(XAiApiConstants.XAiApiIntroductionPromptName)
             );
 
             //
@@ -339,7 +308,7 @@ namespace xAiApi.Providers
                 introductionPrompt,
             ];
             if (forceMessage &&
-                message is not null)
+                !message.IsNullOrDefault())
             {
                 result.Add(message);
             }