Add subaddress support check

diff --git a/lib/l10n/app_en.arb b/lib/l10n/app_en.arb
index 007e530..daffbf7 100644
--- a/lib/l10n/app_en.arb
+++ b/lib/l10n/app_en.arb
@@ -60,11 +60,11 @@
   "homeTransactionConfirmed": "Confirmed",
   "homeNoTransactions": "No transactions",
   "receiveTitle": "Receive",
-  "receivePrimaryAddressWarn": "Warning: For better privacy, consider using subaddresses if supported by your light wallet server.",
-  "receiveSubaddressWarn": "Warning: Make sure your light wallet server supports subaddresses, otherwise, you will not be able to see incoming transactions.",
+  "receivePrimaryAddressWarn": "Warning: Unless you know what you're doing, please consider using subaddresses for better privacy.",
   "receiveShareButton": "Share",
   "receiveShowSubaddressButton": "Show Subaddress",
   "receiveShowPrimaryAddressButton": "Show Primary Address",
+  "receiveServerNoSubaddressesWarn": "Warning: This server does not support subaddresses. For better privacy, consider using a server that supports them. You are receiving to your primary address.",
   "sendTitle": "Send",
   "sendSendButton": "Send",
   "sendTransactionSuccessfullySent": "Transaction successfully sent!",
diff --git a/lib/l10n/app_localizations.dart b/lib/l10n/app_localizations.dart
index 46ee40d..16295e6 100644
--- a/lib/l10n/app_localizations.dart
+++ b/lib/l10n/app_localizations.dart
@@ -461,15 +461,9 @@ abstract class AppLocalizations {
   /// No description provided for @receivePrimaryAddressWarn.
   ///
   /// In en, this message translates to:
-  /// **'Warning: For better privacy, consider using subaddresses if supported by your light wallet server.'**
+  /// **'Warning: Unless you know what you\'re doing, please consider using subaddresses for better privacy.'**
   String get receivePrimaryAddressWarn;
 
-  /// No description provided for @receiveSubaddressWarn.
-  ///
-  /// In en, this message translates to:
-  /// **'Warning: Make sure your light wallet server supports subaddresses, otherwise, you will not be able to see incoming transactions.'**
-  String get receiveSubaddressWarn;
-
   /// No description provided for @receiveShareButton.
   ///
   /// In en, this message translates to:
@@ -488,6 +482,12 @@ abstract class AppLocalizations {
   /// **'Show Primary Address'**
   String get receiveShowPrimaryAddressButton;
 
+  /// No description provided for @receiveServerNoSubaddressesWarn.
+  ///
+  /// In en, this message translates to:
+  /// **'Warning: This server does not support subaddresses. For better privacy, consider using a server that supports them. You are receiving to your primary address.'**
+  String get receiveServerNoSubaddressesWarn;
+
   /// No description provided for @sendTitle.
   ///
   /// In en, this message translates to:
diff --git a/lib/l10n/app_localizations_en.dart b/lib/l10n/app_localizations_en.dart
index 420e2f5..34227ae 100644
--- a/lib/l10n/app_localizations_en.dart
+++ b/lib/l10n/app_localizations_en.dart
@@ -198,11 +198,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get receivePrimaryAddressWarn =>
-      'Warning: For better privacy, consider using subaddresses if supported by your light wallet server.';
-
-  @override
-  String get receiveSubaddressWarn =>
-      'Warning: Make sure your light wallet server supports subaddresses, otherwise, you will not be able to see incoming transactions.';
+      'Warning: Unless you know what you\'re doing, please consider using subaddresses for better privacy.';
 
   @override
   String get receiveShareButton => 'Share';
@@ -213,6 +209,10 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get receiveShowPrimaryAddressButton => 'Show Primary Address';
 
+  @override
+  String get receiveServerNoSubaddressesWarn =>
+      'Warning: This server does not support subaddresses. For better privacy, consider using a server that supports them. You are receiving to your primary address.';
+
   @override
   String get sendTitle => 'Send';
 
diff --git a/lib/l10n/app_localizations_pt.dart b/lib/l10n/app_localizations_pt.dart
index 9ea976d..d7f95d7 100644
--- a/lib/l10n/app_localizations_pt.dart
+++ b/lib/l10n/app_localizations_pt.dart
@@ -198,11 +198,7 @@ class AppLocalizationsPt extends AppLocalizations {
 
   @override
   String get receivePrimaryAddressWarn =>
-      'Aviso: Para maior privacidade, considere usar subendereços se o seu servidor de light wallet os suportar.';
-
-  @override
-  String get receiveSubaddressWarn =>
-      'Aviso: Certifique-se de que seu servidor de light wallet suporta subendereços, caso contrário, você não conseguirá ver as transações recebidas.';
+      'Aviso: A menos que saiba o que está fazendo, por favor considere usar subendereços para melhor privacidade.';
 
   @override
   String get receiveShareButton => 'Compartilhar';
@@ -213,6 +209,10 @@ class AppLocalizationsPt extends AppLocalizations {
   @override
   String get receiveShowPrimaryAddressButton => 'Mostrar Endereço Primário';
 
+  @override
+  String get receiveServerNoSubaddressesWarn =>
+      'Aviso: Este servidor não suporta subendereços. Para melhor privacidade, considere usar um servidor que os suporte. Você está recebendo no seu endereço primário.';
+
   @override
   String get sendTitle => 'Enviar';
 
diff --git a/lib/l10n/app_pt.arb b/lib/l10n/app_pt.arb
index 0509eb8..0f4fc56 100644
--- a/lib/l10n/app_pt.arb
+++ b/lib/l10n/app_pt.arb
@@ -60,11 +60,11 @@
   "homeTransactionConfirmed": "Confirmado",
   "homeNoTransactions": "Sem transações",
   "receiveTitle": "Receber",
-  "receivePrimaryAddressWarn": "Aviso: Para maior privacidade, considere usar subendereços se o seu servidor de light wallet os suportar.",
-  "receiveSubaddressWarn": "Aviso: Certifique-se de que seu servidor de light wallet suporta subendereços, caso contrário, você não conseguirá ver as transações recebidas.",
+  "receivePrimaryAddressWarn": "Aviso: A menos que saiba o que está fazendo, por favor considere usar subendereços para melhor privacidade.",
   "receiveShareButton": "Compartilhar",
   "receiveShowSubaddressButton": "Mostrar Subendereço",
   "receiveShowPrimaryAddressButton": "Mostrar Endereço Primário",
+  "receiveServerNoSubaddressesWarn": "Aviso: Este servidor não suporta subendereços. Para melhor privacidade, considere usar um servidor que os suporte. Você está recebendo no seu endereço primário.",
   "sendTitle": "Enviar",
   "sendSendButton": "Enviar",
   "sendTransactionSuccessfullySent": "Transação enviada com sucesso!",
diff --git a/lib/main.dart b/lib/main.dart
index fe8817d..977dbb1 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -106,6 +106,7 @@ class MyApp extends StatelessWidget {
                     await wallet.refresh();
                     await wallet.loadAllStats();
                     await wallet.connectToDaemon();
+                    await wallet.checkSubaddressSupport();
                   })();
                 }
 
diff --git a/lib/models/wallet_model.dart b/lib/models/wallet_model.dart
index 32a9ee0..0c927e8 100644
--- a/lib/models/wallet_model.dart
+++ b/lib/models/wallet_model.dart
@@ -13,6 +13,7 @@ import 'package:shared_preferences/shared_preferences.dart';
 import 'package:monero/monero.dart' as monero;
 import 'package:monero/src/monero.dart';
 import 'package:monero/src/wallet2.dart';
+import 'package:http/http.dart' as http;
 
 import 'package:skylight_wallet/consts.dart';
 import 'package:skylight_wallet/services/shared_preferences_service.dart';
@@ -20,6 +21,7 @@ import 'package:skylight_wallet/services/tor_service.dart';
 import 'package:skylight_wallet/util/formatting.dart';
 import 'package:skylight_wallet/util/height.dart';
 import 'package:skylight_wallet/util/logging.dart';
+import 'package:skylight_wallet/util/socks_http.dart';
 import 'package:skylight_wallet/util/wallet.dart';
 import 'package:skylight_wallet/util/wallet_password.dart';
 
@@ -145,6 +147,7 @@ class WalletModel with ChangeNotifier {
   double? _unlockedBalance;
   double? _totalBalance;
   List<TxDetails> _txHistory = [];
+  bool? _serverSupportsSubaddresses;
 
   Wallet2Wallet? get w2Wallet => _w2Wallet;
   bool get hasAttemptedConnection => _hasAttemptedConnection;
@@ -155,15 +158,12 @@ class WalletModel with ChangeNotifier {
   double? get totalBalance => _totalBalance;
   List<TxDetails> get txHistory => _txHistory;
   bool get usingTor => _connectionUseTor;
+  bool? get serverSupportsSubaddresses => _serverSupportsSubaddresses;
 
   WalletModel() {
     _startTimers();
   }
 
-  void notifyListenersFromOutside() {
-    notifyListeners();
-  }
-
   void _startTimers() {
     Timer.periodic(Duration(seconds: 1), (timer) {
       _runCheckConnectionTimerTask();
@@ -402,6 +402,84 @@ class WalletModel with ChangeNotifier {
     }
   }
 
+  Future<void> checkSubaddressSupport() async {
+    final protocol = _connectionUseSsl ? 'https' : 'http';
+    final url = Uri.parse('$protocol://$_connectionAddress/upsert_subaddrs');
+    final primaryAddress = getPrimaryAddress();
+    final viewKey = _w2Wallet!.secretViewKey();
+    final subaddrs = [
+      {
+        "key": 0,
+        "value": [
+          [0, 1],
+        ],
+      },
+    ];
+    final getAll = false;
+
+    final body = json.encode({
+      'address': primaryAddress,
+      'view_key': viewKey,
+      'subaddrs': subaddrs,
+      'get_all': getAll,
+    });
+
+    log(LogLevel.info, 'Checking subaddress support:');
+    log(LogLevel.info, '  url: $url');
+    log(LogLevel.info, '  primaryAddress: $primaryAddress');
+    log(LogLevel.info, '  viewKey: <hidden>');
+    log(LogLevel.info, '  subaddrs: $subaddrs');
+    log(LogLevel.info, '  getAll: $getAll');
+
+    var httpStatus = 0;
+
+    for (int i = 0; i < 3; i++) {
+      try {
+        if (_connectionUseTor) {
+          await TorService.sharedInstance.waitUntilConnected();
+          final proxyInfo = TorService.sharedInstance.getProxyInfo();
+          final response = await makeSocksHttpRequest(
+            'POST',
+            url.toString(),
+            proxyInfo,
+            body: body,
+          ).timeout(Duration(seconds: 20));
+
+          httpStatus = response.statusCode;
+        } else {
+          final response = await http
+              .post(
+                url,
+                headers: {'Content-Type': 'application/json'},
+                body: body,
+              )
+              .timeout(Duration(seconds: 5));
+
+          httpStatus = response.statusCode;
+        }
+
+        break;
+      } catch (e) {
+        if (i == 2) {
+          log(
+            LogLevel.warn,
+            'Failed to check subaddress support after ${i + 1} attempts.',
+          );
+          log(LogLevel.warn, 'Error: $e');
+        }
+      }
+    }
+
+    _serverSupportsSubaddresses = httpStatus == 200;
+
+    log(
+      LogLevel.info,
+      'Subaddress support check result: $_serverSupportsSubaddresses (status: $httpStatus)',
+    );
+
+    notifyListeners();
+  }
+
   Future<void> refresh() async {
     final walletFfiAddr = _w2Wallet!.ffiAddress();
     final historyFfiAddr = _w2TxHistory!.ffiAddress();
diff --git a/lib/screens/receive.dart b/lib/screens/receive.dart
index cf69e08..ff04e92 100644
--- a/lib/screens/receive.dart
+++ b/lib/screens/receive.dart
@@ -2,7 +2,6 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:skylight_wallet/l10n/app_localizations.dart';
 import 'package:skylight_wallet/models/wallet_model.dart';
-import 'package:skylight_wallet/services/shared_preferences_service.dart';
 import 'package:provider/provider.dart';
 import 'package:qr_flutter/qr_flutter.dart';
 import 'package:share_plus/share_plus.dart';
@@ -16,18 +15,16 @@ class ReceiveScreen extends StatefulWidget {
 }
 
 class _ReceiveScreenState extends State<ReceiveScreen> {
-  String _address = '';
-  bool _showSubaddress = false;
-  double _previousBrightness = 0.0;
+  var _primaryAddress = '';
+  var _subaddress = '';
+  var _showSubaddress = true;
+  var _previousBrightness = 0.0;
 
   @override
   void initState() {
     super.initState();
 
-    final wallet = Provider.of<WalletModel>(context, listen: false);
-    _address = wallet.getPrimaryAddress();
-
-    _loadShowReceiveSubaddress();
+    _loadAddresses();
     _setBrightnessToMax();
   }
 
@@ -37,37 +34,22 @@ class _ReceiveScreenState extends State<ReceiveScreen> {
     super.dispose();
   }
 
-  Future<void> _loadShowReceiveSubaddress() async {
-    final showReceiveSubaddress =
-        await SharedPreferencesService.get<bool>(
-          SharedPreferencesKeys.showReceiveSubaddress,
-        ) ??
-        false;
-
-    _setShowSubaddress(showReceiveSubaddress);
-  }
-
-  Future<void> _setShowSubaddress(bool value) async {
+  Future<void> _loadAddresses() async {
     final wallet = Provider.of<WalletModel>(context, listen: false);
 
-    await SharedPreferencesService.set(
-      SharedPreferencesKeys.showReceiveSubaddress,
-      value,
-    );
+    final primaryAddress = wallet.getPrimaryAddress();
+    final subaddress = await wallet.getUnusedSubaddress();
 
-    final subddress = await wallet.getUnusedSubaddress();
-
-    if (value) {
-      setState(() {
-        _showSubaddress = true;
-        _address = subddress;
-      });
-    } else {
-      setState(() {
-        _showSubaddress = false;
-        _address = wallet.getPrimaryAddress();
-      });
-    }
+    setState(() {
+      _primaryAddress = primaryAddress;
+      _subaddress = subaddress;
+    });
+  }
+
+  void _setShowSubaddress(bool value) {
+    setState(() {
+      _showSubaddress = value;
+    });
   }
 
   Future<void> _setBrightnessToMax() async {
@@ -86,73 +68,89 @@ class _ReceiveScreenState extends State<ReceiveScreen> {
     final i18n = AppLocalizations.of(context)!;
     final brightness = Theme.of(context).brightness;
     final isDarkTheme = brightness == Brightness.dark;
+    final wallet = Provider.of<WalletModel>(context);
+    var address = '';
+
+    if (wallet.serverSupportsSubaddresses == false) {
+      address = _primaryAddress;
+    }
+
+    if (wallet.serverSupportsSubaddresses == true) {
+      address = _showSubaddress ? _subaddress : _primaryAddress;
+    }
 
     return Scaffold(
       appBar: AppBar(title: Text(i18n.receiveTitle)),
       body: Center(
         child: Padding(
           padding: EdgeInsets.symmetric(horizontal: 20),
-          child: Column(
-            mainAxisAlignment: MainAxisAlignment.center,
-            spacing: 20,
-            children: [
-              QrImageView(
-                data: _address,
-                eyeStyle: QrEyeStyle(
-                  eyeShape: QrEyeShape.square,
-                  color: isDarkTheme ? Colors.grey[300] : Colors.black,
-                ),
-                dataModuleStyle: QrDataModuleStyle(
-                  dataModuleShape: QrDataModuleShape.square,
-                  color: isDarkTheme ? Colors.grey[300] : Colors.black,
-                ),
-              ),
-              if (_showSubaddress)
-                Text(
-                  i18n.receiveSubaddressWarn,
-                  textAlign: TextAlign.center,
-                  style: TextStyle(color: Colors.red),
-                ),
-              if (!_showSubaddress)
-                Text(
-                  i18n.receivePrimaryAddressWarn,
-                  textAlign: TextAlign.center,
-                  style: TextStyle(color: Colors.red),
-                ),
-              GestureDetector(
-                child: Text(
-                  _address,
-                  textAlign: TextAlign.center,
-                  style: TextStyle(fontFamily: 'monospace'),
-                ),
-                onTap: () async {
-                  await Clipboard.setData(ClipboardData(text: _address));
-                },
-              ),
-              Row(
-                spacing: 20,
-                mainAxisAlignment: MainAxisAlignment.center,
-                children: [
-                  FilledButton.icon(
-                    onPressed: () =>
-                        SharePlus.instance.share(ShareParams(text: _address)),
-                    icon: Icon(Icons.share),
-                    label: Text(i18n.receiveShareButton),
-                  ),
-                  if (!_showSubaddress)
-                    TextButton(
-                      onPressed: () => _setShowSubaddress(true),
-                      child: Text(i18n.receiveShowSubaddressButton),
+          child: wallet.serverSupportsSubaddresses == null
+              ? CircularProgressIndicator()
+              : Column(
+                  mainAxisAlignment: MainAxisAlignment.center,
+                  spacing: 20,
+                  children: [
+                    QrImageView(
+                      data: address,
+                      eyeStyle: QrEyeStyle(
+                        eyeShape: QrEyeShape.square,
+                        color: isDarkTheme ? Colors.grey[300] : Colors.black,
+                      ),
+                      dataModuleStyle: QrDataModuleStyle(
+                        dataModuleShape: QrDataModuleShape.square,
+                        color: isDarkTheme ? Colors.grey[300] : Colors.black,
+                      ),
                     ),
-                  if (_showSubaddress)
-                    TextButton(
-                      onPressed: () => _setShowSubaddress(false),
-                      child: Text(i18n.receiveShowPrimaryAddressButton),
+                    if (wallet.serverSupportsSubaddresses == false)
+                      Text(
+                        i18n.receiveServerNoSubaddressesWarn,
+                        textAlign: TextAlign.center,
+                        style: TextStyle(color: Colors.red),
+                      ),
+                    if (!_showSubaddress)
+                      Text(
+                        i18n.receivePrimaryAddressWarn,
+                        textAlign: TextAlign.center,
+                        style: TextStyle(color: Colors.red),
+                      ),
+                    GestureDetector(
+                      child: Text(
+                        address,
+                        textAlign: TextAlign.center,
+                        style: TextStyle(fontFamily: 'monospace'),
+                      ),
+                      onTap: () async {
+                        await Clipboard.setData(ClipboardData(text: address));
+                      },
                     ),
-                ],
-              ),
-            ],
-          ),
+                    Row(
+                      spacing: 20,
+                      mainAxisAlignment: MainAxisAlignment.center,
+                      children: [
+                        FilledButton.icon(
+                          onPressed: () => SharePlus.instance.share(
+                            ShareParams(text: address),
+                          ),
+                          icon: Icon(Icons.share),
+                          label: Text(i18n.receiveShareButton),
+                        ),
+                        // Only show toggle button if server supports subaddresses
+                        if (wallet.serverSupportsSubaddresses == true &&
+                            !_showSubaddress)
+                          TextButton(
+                            onPressed: () => _setShowSubaddress(true),
+                            child: Text(i18n.receiveShowSubaddressButton),
+                          ),
+                        if (wallet.serverSupportsSubaddresses == true &&
+                            _showSubaddress)
+                          TextButton(
+                            onPressed: () => _setShowSubaddress(false),
+                            child: Text(i18n.receiveShowPrimaryAddressButton),
+                          ),
+                      ],
+                    ),
+                  ],
+                ),
         ),
       ),
     );
diff --git a/lib/screens/restore_wallet.dart b/lib/screens/restore_wallet.dart
index 7b61365..8538d47 100644
--- a/lib/screens/restore_wallet.dart
+++ b/lib/screens/restore_wallet.dart
@@ -54,6 +54,7 @@ class _RestoreWalletScreenState extends State<RestoreWalletScreen> {
       await wallet.refresh();
       await wallet.loadAllStats();
       await wallet.connectToDaemon();
+      wallet.checkSubaddressSupport();
 
       setState(() {
         _isLoading = false;
diff --git a/lib/services/shared_preferences_service.dart b/lib/services/shared_preferences_service.dart
index e0b571f..e3a0f28 100644
--- a/lib/services/shared_preferences_service.dart
+++ b/lib/services/shared_preferences_service.dart
@@ -12,7 +12,6 @@ class SharedPreferencesKeys {
   static const String connectionProxyPort = 'connectionProxyPort';
   static const String connectionUseTor = 'connectionUseTor';
   static const String connectionUseSsl = 'connectionUseSsl';
-  static const String showReceiveSubaddress = 'showReceiveSubaddress';
   static const String walletRestoreHeight = 'walletRestoreHeight';
   static const String txHistoryCount = 'txHistoryCount';
   static const String pendingOutgoingTxs = 'pendingOutgoingTxs';
diff --git a/lib/util/socks_http.dart b/lib/util/socks_http.dart
index cee8988..52b5cf4 100644
--- a/lib/util/socks_http.dart
+++ b/lib/util/socks_http.dart
@@ -49,7 +49,7 @@ String getRawHttpRequestString(String method, String url, {Object? jsonBody}) {
   request.write('Connection: close\r\n');
   request.write('Accept: */*\r\n');
 
-  final jsonBodyStr = jsonBody is Object ? jsonEncode(jsonBody) : null;
+  final jsonBodyStr = jsonBody is Object ? jsonBody.toString() : null;
 
   if (jsonBodyStr != null && jsonBodyStr.isNotEmpty) {
     final bodyBytes = utf8.encode(jsonBodyStr);
@@ -119,8 +119,9 @@ ParsedHttpResponse parseHttpResponse(String rawResponse) {
 Future<ParsedHttpResponse> makeSocksHttpRequest(
   String method,
   String url,
-  ({InternetAddress host, int port}) proxyInfo,
-) async {
+  ({InternetAddress host, int port}) proxyInfo, {
+  Object? body,
+}) async {
   final uri = Uri.parse(url);
 
   final socket = await SOCKSSocket.create(
@@ -132,7 +133,7 @@ Future<ParsedHttpResponse> makeSocksHttpRequest(
   await socket.connect();
   await socket.connectTo(uri.host, uri.port);
 
-  final rawRequest = getRawHttpRequestString(method, url);
+  final rawRequest = getRawHttpRequestString(method, url, jsonBody: body);
   final rawResponse = await socket.send(rawRequest);
   final parsedResponse = parseHttpResponse(rawResponse);