feat: handler ui and update void ui

lib/core/network/dio_client.dart

@@ -1,6 +1,9 @@
-// lib/core/network/dio_client.dart
 import 'package:awesome_dio_interceptor/awesome_dio_interceptor.dart';
 import 'package:dio/dio.dart';
+import 'package:enaklo_pos/core/extensions/build_context_ext.dart';
+import 'package:enaklo_pos/presentation/auth/login_page.dart';
+import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 
 class DioClient {
   static final Dio _dio = Dio(BaseOptions(
@@ -10,6 +13,7 @@ class DioClient {
       'Accept': 'application/json',
     },
   ))
+    ..interceptors.add(AuthInterceptor())
     ..interceptors.add(
       AwesomeDioInterceptor(
         logRequestTimeout: true,
@@ -20,3 +24,158 @@ class DioClient {
 
   static Dio get instance => _dio;
 }
+
+class AuthInterceptor extends Interceptor {
+  static final GlobalKey<NavigatorState> navigatorKey =
+      GlobalKey<NavigatorState>();
+
+  @override
+  void onRequest(
+      RequestOptions options, RequestInterceptorHandler handler) async {
+    // Add token to request headers
+    final prefs = await SharedPreferences.getInstance();
+    final token = prefs.getString('auth_token');
+
+    if (token != null) {
+      options.headers['Authorization'] = 'Bearer $token';
+    }
+
+    handler.next(options);
+  }
+
+  @override
+  void onResponse(Response response, ResponseInterceptorHandler handler) {
+    handler.next(response);
+  }
+
+  @override
+  void onError(DioException err, ErrorInterceptorHandler handler) async {
+    // Check if error is 401 (Unauthorized) - token expired
+    if (err.response?.statusCode == 401) {
+      await _handleTokenExpired();
+    }
+
+    handler.next(err);
+  }
+
+  Future<void> _handleTokenExpired() async {
+    // Clear stored token
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.remove('auth_token');
+    await prefs.remove('refresh_token');
+    await prefs.clear(); // Optional: clear all user data
+
+    // Navigate to login page
+    final context = navigatorKey.currentContext;
+    if (context != null) {
+      // Option 1: Navigate and remove all previous routes
+      context.pushReplacement(LoginPage());
+
+      // Option 2: If using GoRouter, uncomment below:
+      // GoRouter.of(context).go('/login');
+
+      // Option 3: If using custom routing, uncomment below:
+      // Navigator.of(context).pushAndRemoveUntil(
+      //   MaterialPageRoute(builder: (context) => LoginPage()),
+      //   (route) => false,
+      // );
+    }
+  }
+}
+
+// Alternative: Dengan Refresh Token Logic
+class AuthInterceptorWithRefresh extends Interceptor {
+  static final GlobalKey<NavigatorState> navigatorKey =
+      GlobalKey<NavigatorState>();
+
+  @override
+  void onRequest(
+      RequestOptions options, RequestInterceptorHandler handler) async {
+    final prefs = await SharedPreferences.getInstance();
+    final token = prefs.getString('auth_token');
+
+    if (token != null) {
+      options.headers['Authorization'] = 'Bearer $token';
+    }
+
+    handler.next(options);
+  }
+
+  @override
+  void onError(DioException err, ErrorInterceptorHandler handler) async {
+    if (err.response?.statusCode == 401) {
+      // Try refresh token first
+      final success = await _tryRefreshToken();
+
+      if (success) {
+        // Retry the original request
+        final response = await _retryRequest(err.requestOptions);
+        handler.resolve(response);
+        return;
+      } else {
+        // Refresh failed, redirect to login
+        await _handleTokenExpired();
+      }
+    }
+
+    handler.next(err);
+  }
+
+  Future<bool> _tryRefreshToken() async {
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      final refreshToken = prefs.getString('refresh_token');
+
+      if (refreshToken == null) return false;
+
+      final response = await Dio().post(
+        'YOUR_REFRESH_TOKEN_ENDPOINT',
+        data: {'refresh_token': refreshToken},
+      );
+
+      if (response.statusCode == 200) {
+        final newToken = response.data['access_token'];
+        final newRefreshToken = response.data['refresh_token'];
+
+        await prefs.setString('auth_token', newToken);
+        await prefs.setString('refresh_token', newRefreshToken);
+
+        return true;
+      }
+    } catch (e) {
+      print('Refresh token failed: $e');
+    }
+
+    return false;
+  }
+
+  Future<Response> _retryRequest(RequestOptions options) async {
+    final prefs = await SharedPreferences.getInstance();
+    final token = prefs.getString('auth_token');
+
+    options.headers['Authorization'] = 'Bearer $token';
+
+    return await DioClient.instance.request(
+      options.path,
+      options: Options(
+        method: options.method,
+        headers: options.headers,
+      ),
+      data: options.data,
+      queryParameters: options.queryParameters,
+    );
+  }
+
+  Future<void> _handleTokenExpired() async {
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.clear();
+
+    final context = navigatorKey.currentContext;
+    if (context != null) {
+      Navigator.of(context).pushNamedAndRemoveUntil(
+        '/login',
+        (route) => false,
+      );
+    }
+  }
+}