initial import

lib/services/auth_service.dart

@@ -0,0 +1,54 @@
+import 'package:flutter_web_auth_2/flutter_web_auth_2.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import '../config/api_config.dart';
+
+class AuthService {
+  static const String _tokenKey = 'access_token';
+  static const String _accountKey = 'selected_account';
+
+  Future<String?> getStoredToken() async {
+    final prefs = await SharedPreferences.getInstance();
+    return prefs.getString(_tokenKey);
+  }
+
+  Future<String?> getStoredAccount() async {
+    final prefs = await SharedPreferences.getInstance();
+    return prefs.getString(_accountKey);
+  }
+
+  Future<String?> login() async {
+    final result = await FlutterWebAuth2.authenticate(
+      url: '${ApiConfig.baseUrl}/login?redirect_uri=${Uri.encodeComponent('myice://callback')}',
+      callbackUrlScheme: 'myice',
+    );
+
+    final uri = Uri.parse(result);
+    // Check for authorization errors first
+    final error = uri.queryParameters['error'];
+    if (error != null) {
+      throw Exception('Authorization failed: $error');
+    }
+    // Extract token from fragment (#access_token=...)
+    final fragment = uri.fragment;
+    final params = Uri.splitQueryString(fragment);
+    final token = params['access_token'];
+
+    if (token != null) {
+      final prefs = await SharedPreferences.getInstance();
+      await prefs.setString(_tokenKey, token);
+    }
+
+    return token;
+  }
+
+  Future<void> setAccount(String account) async {
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setString(_accountKey, account);
+  }
+
+  Future<void> logout() async {
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.remove(_tokenKey);
+    await prefs.remove(_accountKey);
+  }
+}