fix: make sure language changes propagate to language check service

Author: andrew-bekhiet-solid

lib/src/core/controllers/language_tool_controller.dart

@@ -22,9 +22,6 @@ class LanguageToolController extends TextEditingController {
   /// Color scheme to highlight mistakes
   final HighlightStyle highlightStyle;
 
-  /// Create an instance of [LanguageToolClient] instance
-  final _languageToolClient = LanguageToolClient();
-
   /// Create an instance of [KeepLatestResponseService]
   /// to handle asynchronous operations
   final _latestResponseService = KeepLatestResponseService();
@@ -53,10 +50,10 @@ class LanguageToolController extends TextEditingController {
   ///
   /// A language code like en-US, de-DE, fr, or auto to guess
   /// the language automatically.
-  String get language => _languageToolClient.language;
+  String get language => _languageCheckService?.language ?? 'auto';
 
   set language(String language) {
-    _languageToolClient.language = language;
+    _languageCheckService?.language = language;
   }
 
   /// An error that may have occurred during the API fetch.
@@ -89,7 +86,7 @@ class LanguageToolController extends TextEditingController {
     _languageCheckService = _getLanguageCheckService(
       delayType: delayType,
       delay: delay,
-      languageToolClient: _languageToolClient,
+      languageToolClient: LanguageToolClient(),
     );
   }
 

lib/src/domain/language_check_service.dart

@@ -3,6 +3,17 @@ import 'package:languagetool_textfield/src/utils/result.dart';
 
 /// A base language check service.
 abstract class LanguageCheckService {
+  /// Gets the current language code used for language checking.
+  ///
+  /// Returns a string representing the language code (e.g., 'en-US', 'de-DE').
+  String get language;
+
+  /// Sets the language code to be used for language checking.
+  ///
+  /// [language] A string representing the language code (e.g., 'en-US', 'de-DE').
+  /// This determines which language rules will be applied during text analysis.
+  set language(String language);
+
   /// Creates a new instance of the [LanguageCheckService] class.
   const LanguageCheckService();
 

lib/src/implementations/lang_tool_service.dart

@@ -9,6 +9,14 @@ class LangToolService extends LanguageCheckService {
   /// An instance of this class that is used to interact with LanguageTool API.
   final LanguageToolClient languageTool;
 
+  @override
+  String get language => languageTool.language;
+
+  @override
+  set language(String language) {
+    languageTool.language = language;
+  }
+
   /// Creates a new instance of the [LangToolService].
   LangToolService(this.languageTool);