add support for OCR ...

Configurations/XAiApiConfiguration.cs

@@ -1,3 +1,4 @@
+using xAiApi.Models;
 using xAiModels.Models;
 
 namespace xAiApi.Configurations
@@ -13,5 +14,10 @@ namespace xAiApi.Configurations
         /// Allowed Prompts to Use ...
         /// </summary>
         public XAiPromptDescriptor[] Prompts { get; set; } = [];
+
+        /// <summary>
+        /// OCR Configuration ...
+        /// </summary>
+        public XAiOCRDescriptor OCR { get; set; }
     }
 }

Models/XAiOCRDescriptor.cs

@@ -0,0 +1,27 @@
+using Tesseract;
+
+namespace xAiApi.Models
+{
+    public class XAiOCRDescriptor
+    {
+        /// <summary>
+        /// Provides Trained Data Path ...
+        /// </summary>
+        public string DataPath { get; set; }
+
+        /// <summary>
+        /// The Engine for Doing OCR ...
+        /// </summary>
+        public EngineMode EngineMode { get; set; }
+
+        /// <summary>
+        /// Enable OCR Fallback using Model ...
+        /// </summary>
+        public bool EnableOcrFallback { get; set; }
+
+        /// <summary>
+        /// Default OCR Language ...
+        /// </summary>
+        public string DefaultLanguage { get; set; }
+    }
+}

Providers/Extractors/XImageFileContentExtractor.cs

@@ -5,6 +5,10 @@ using System.Threading;
 using xAiModels.Models;
 using System.Threading.Tasks;
 using xAiApi.Interfaces.Extractors;
+using xAiApi.Configurations;
+using xCommons.Extensions;
+using xExceptions.Constants;
+using Tesseract;
 
 namespace xAiApi.Providers.Extractors
 {
@@ -24,16 +28,25 @@ namespace xAiApi.Providers.Extractors
         ];
 
         /// <summary>
-        /// آیا OCR فعال است (برای مدل‌های غیر Vision) ...
+        /// AI Api Configuration ...
         /// </summary>
-        private readonly bool _enableOcrFallback;
+        private readonly XAiApiConfiguration configuration;
 
-        public XImageFileContentExtractor() : this(enableOcrFallback: true)
-        { }
-
-        public XImageFileContentExtractor(bool enableOcrFallback = true)
+        public XImageFileContentExtractor(
+            XAiApiConfiguration configuration
+        )
         {
-            _enableOcrFallback = enableOcrFallback;
+            //
+            if (configuration.IsNullOrDefault() ||
+                configuration.OCR.IsNullOrDefault() ||
+                configuration.OCR.DataPath.IsNullOrEmpty() ||
+                configuration.OCR.DefaultLanguage.IsNullOrEmpty())
+            {
+                XException.InvalidConfiguration.Throw();
+            }
+
+            //
+            this.configuration = configuration;
         }
 
         /// <summary>
@@ -103,8 +116,9 @@ namespace xAiApi.Providers.Extractors
                 Description = $"Attached image: {fileName}"
             });
 
-            // OCR Fallback برای مدل‌های متنی
-            if (_enableOcrFallback)
+            //
+            // OCR Fallback ...
+            if (configuration.OCR.EnableOcrFallback)
             {
                 //
                 try
@@ -135,8 +149,44 @@ namespace xAiApi.Providers.Extractors
         )
         {
             //
-            // TODO: Complete this ...
-            return await Task.FromResult(string.Empty);
+            return await Task.Run(() =>
+            {
+                //
+                // Validate Path ...
+                if (!Directory.Exists(configuration.OCR.DataPath))
+                {
+                    //
+                    throw new DirectoryNotFoundException(
+                        $"TessData directory not found at: {configuration.OCR.DataPath}. " +
+                        "Please download traineddata files from https://github.com/tesseract-ocr/tessdata"
+                    );
+                }
+            
+                //
+                using var engine = new TesseractEngine(
+                    datapath: configuration.OCR.DataPath,
+                    language: configuration.OCR.DefaultLanguage,
+                    engineMode: configuration.OCR.EngineMode
+                );
+
+                //
+                using var pix = Pix.LoadFromMemory(imageBytes);
+
+                //
+                cancellationToken.ThrowIfCancellationRequested();
+
+                //
+                using var page = engine.Process(pix);
+
+                //
+                var text = page.GetText();
+
+                //
+                text = text?.Trim();
+
+                //
+                return text ?? string.Empty;
+            }, cancellationToken);
         }
     }
 }

Startup.cs

@@ -199,14 +199,6 @@ namespace xAiApi
 
             //
             services.AddSingleton<IXFileContentExtractor, XFileContentExtractor>();
-            // services.AddSingleton(sp =>
-            // {
-            //     // 
-            //     var extractors = sp.GetServices<IXFileContentExtractor>();
-            //     return new XFileContentExtractor(extractors);
-            // });
-            // services.AddSingleton<IXFileContentExtractor>(sp =>
-            //     sp.GetRequiredService<XFileContentExtractor>());
 
             //
             // Register Default Ai Service ...

appsettings.Development.json

@@ -78,12 +78,18 @@
         "Description": "",
         "Params": []
       }
-    ]
+    ],
+    "OCR": {
+      "DataPath": "Models",
+      "EngineMode": "LstmOnly",
+      "EnableOcrFallback": true,
+      "DefaultLanguage": "fas+eng"
+    }
   },
   "Logging": {
     "LogLevel": {
-      "Default": "Information",
       "Microsoft": "Warning",
+      "Default": "Information",
       "Microsoft.Hosting.Lifetime": "Information"
     }
   },