last ...

Extensions/XModelsExtensions.cs

@@ -1,10 +1,20 @@
+using System;
+using OpenAI;
 using System.Linq;
+using OllamaSharp;
+using System.Net.Http;
 using xAiApi.Constants;
 using xAiModels.Models;
+using System.Threading;
+using System.ClientModel;
 using xCommons.Extensions;
+using xAiModels.Constants;
 using xAiModels.Extensions;
 using xAiApi.Configurations;
+using xExceptions.Constants;
+using Microsoft.Extensions.AI;
 using System.Collections.Generic;
+using System.ClientModel.Primitives;
 
 namespace xAiApi.Extensions
 {
@@ -176,5 +186,107 @@ namespace xAiApi.Extensions
             //
             return result;
         }
+
+        /// <summary>
+        /// Provide HttpClient for Common Usages ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static HttpClient GetHttpClient(this string source)
+        {
+            //
+            var result = new HttpClient
+            {
+                //
+                // Disable timeout completely (not recommended for production)
+                Timeout = Timeout.InfiniteTimeSpan,
+
+                //
+                BaseAddress = source.IsNullOrEmpty()
+                    ? null
+                    : new Uri(source),
+
+                //
+                // OR set a very long timeout (e.g., 30 minutes for large file uploads)
+                // Timeout = TimeSpan.FromMinutes(30)
+            };
+
+            //
+            return result;
+        }
+
+        /// <summary>
+        /// Instance and Retrieve Chat Client ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static IChatClient GetClient(this XAiModelDescriptor source)
+        {
+            //
+            // Try to Initialize LLm ...
+            var model = source.LLM;
+            var apiKey = source.ApiKey;
+            var url = new Uri(source.Url);
+            var httpClient = source.Url.GetHttpClient();
+
+            //
+            IChatClient result = null;
+            switch (source.Provider)
+            {
+                //
+                case XAiModelProviderType.Ollama:
+                    //
+                    // Instance Ollama Client using Custom HttpCLient ...
+                    var ollamaClient = new OllamaApiClient(httpClient, model);
+                    result =
+                        new ChatClientBuilder(ollamaClient)
+                        .UseFunctionInvocation()
+                        .Build();
+                    break;
+
+                //
+                case XAiModelProviderType.OpenAI:
+                    //
+                    // Instance Ollama Client using Custom HttpCLient ...
+                    var openAiClient = new OpenAIClient(
+                        new ApiKeyCredential(apiKey.IsNullOrEmpty() ? XAiApiConstants.XOpenAINoKey : apiKey),
+                        new OpenAIClientOptions
+                        {
+                            Endpoint = url,
+                            Transport = new HttpClientPipelineTransport(httpClient)
+                        }
+                    );
+                    result =
+                        new ChatClientBuilder(
+                            openAiClient
+                            .GetChatClient(model)
+                        .AsIChatClient())
+                        .UseFunctionInvocation()
+                        .Build();
+                    break;
+
+                //
+                case XAiModelProviderType.DeepSeek:
+                    break;
+
+                //
+                case XAiModelProviderType.HuggingFace:
+                    break;
+
+                //
+                default:
+                    break;
+            }
+
+            //
+            if (result.IsNullOrDefault())
+            {
+                XException.InvalidData.Throw();
+            }
+
+            //
+            return result;
+        }
+
     }
 }