feat: Add theme customization options in settings screen and update app theme logic

lib/app.dart

@@ -19,6 +19,7 @@ import 'package:notas/widgets/app_title_bar.dart';
 import 'package:notas/widgets/sync_status_indicator.dart';
 import 'package:path/path.dart' as p;
 import 'package:path_provider/path_provider.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 import 'package:window_manager/window_manager.dart';
 
 enum _AppSection {
@@ -50,6 +51,7 @@ class _NotesAppState extends State<NotesApp>
   static const Duration _screenTransitionDuration = Duration(milliseconds: 280);
   static const Duration _biometricInactivityTimeout = Duration(minutes: 5);
   static const Duration _syncInterval = Duration(minutes: 5);
+  static const String _themeSeedColorKey = 'theme_seed_color_v1';
 
   final LocalVaultService _vaultService = LocalVaultService.instance;
   final GlobalKey<ScaffoldMessengerState> _scaffoldMessengerKey =
@@ -71,6 +73,7 @@ class _NotesAppState extends State<NotesApp>
   SyncStatus _syncStatus = SyncStatus.idle;
   String? _syncErrorMessage;
   int _homeRefreshToken = 0;
+  Color _themeSeedColor = Colors.amber;
 
   @override
   void initState() {
@@ -80,6 +83,7 @@ class _NotesAppState extends State<NotesApp>
       windowManager.addListener(this);
       windowManager.setPreventClose(true);
     }
+    _loadThemeSeedColor();
     _bootstrapVault();
   }
 
@@ -96,6 +100,33 @@ class _NotesAppState extends State<NotesApp>
     super.dispose();
   }
 
+  Future<void> _loadThemeSeedColor() async {
+    final SharedPreferences prefs = await SharedPreferences.getInstance();
+    final int? storedColorValue = prefs.getInt(_themeSeedColorKey);
+    if (storedColorValue == null || !mounted) {
+      return;
+    }
+
+    setState(() {
+      _themeSeedColor = Color(storedColorValue);
+    });
+  }
+
+  Future<void> _setThemeSeedColor(Color color) async {
+    final SharedPreferences prefs = await SharedPreferences.getInstance();
+    await prefs.setInt(_themeSeedColorKey, color.value);
+
+    if (!mounted) {
+      return;
+    }
+
+    setState(() {
+      _themeSeedColor = color;
+    });
+  }
+
+  ThemeData get _theme => AppTheme.theme(seedColor: _themeSeedColor);
+
   @override
   void didChangeAppLifecycleState(AppLifecycleState state) {
     if (_isUnlocking) {
@@ -202,8 +233,9 @@ class _NotesAppState extends State<NotesApp>
 
       // Start periodic sync
       _startPeriodicSync();
-      // Run an initial full sync immediately to pull server changes
-      unawaited(_performSync(forceFull: true));
+      // Run an initial sync immediately and let the repository use the
+      // stored lastSyncAt when it exists.
+      unawaited(_performSync());
     } catch (e) {
       // If the database file is not a valid SQLite DB (e.g., wrong key or corruption),
       // reset the local vault so the app doesn't crash. The reset will delete DB files
@@ -668,7 +700,7 @@ class _NotesAppState extends State<NotesApp>
       navigatorKey: _navigatorKey,
       title: 'Mis Notas',
       debugShowCheckedModeBanner: false,
-      theme: AppTheme.theme,
+      theme: _theme,
       home: const Scaffold(
         body: SafeArea(
           child: Column(
@@ -699,7 +731,7 @@ class _NotesAppState extends State<NotesApp>
       title: 'Mis Notas',
       debugShowCheckedModeBanner: false,
       scaffoldMessengerKey: _scaffoldMessengerKey,
-      theme: AppTheme.theme,
+      theme: _theme,
       home: home,
     );
   }
@@ -720,6 +752,9 @@ class _NotesAppState extends State<NotesApp>
             key: const ValueKey<String>('settings-screen'),
             onDeleteAllData: _resetLocalVaultData,
             onBackToHome: _openHome,
+            onForceSync: () => _performSync(forceFull: true),
+            currentSeedColor: _themeSeedColor,
+            onThemeColorSelected: _setThemeSeedColor,
           );
 
     return MaterialApp(
@@ -727,7 +762,7 @@ class _NotesAppState extends State<NotesApp>
       title: 'Mis Notas',
       debugShowCheckedModeBanner: false,
       scaffoldMessengerKey: _scaffoldMessengerKey,
-      theme: AppTheme.theme,
+      theme: _theme,
       home: Shortcuts(
         shortcuts: <LogicalKeySet, Intent>{
           LogicalKeySet(LogicalKeyboardKey.f5): const PerformSyncIntent(),

lib/screens/settings_screen.dart

@@ -8,10 +8,16 @@ class SettingsScreen extends StatefulWidget {
     super.key,
     required this.onDeleteAllData,
     required this.onBackToHome,
+    required this.onForceSync,
+    required this.currentSeedColor,
+    required this.onThemeColorSelected,
   });
 
   final Future<void> Function() onDeleteAllData;
   final VoidCallback onBackToHome;
+  final Future<void> Function() onForceSync;
+  final Color currentSeedColor;
+  final Future<void> Function(Color color) onThemeColorSelected;
 
   @override
   State<SettingsScreen> createState() => _SettingsScreenState();
@@ -19,18 +25,30 @@ class SettingsScreen extends StatefulWidget {
 
 class _SettingsScreenState extends State<SettingsScreen> {
   bool _isBusy = false;
+  bool _isSyncing = false;
+  bool _isThemeSaving = false;
   final TextEditingController _endpointController = TextEditingController();
   final TextEditingController _encryptionKeyController = TextEditingController();
   bool _endpointLoading = true;
   bool _encryptionKeyLoading = false;
   bool _encryptionKeyVisible = false;
+  late Color _selectedSeedColor;
+
+  static const List<Color> _themeColorOptions = <Color>[
+    Colors.amber,
+    Colors.blue,
+    Colors.teal,
+    Colors.green,
+    Colors.pink,
+    Colors.purple,
+  ];
 
   Future<void> _confirmAndDeleteAll() async {
     final bool? confirmed = await showDialog<bool>(
       context: context,
       builder: (context) => AlertDialog(
         title: const Text('Borrar todos los datos'),
-        content: const Text('¿Estás seguro? Esta acción eliminará la base de datos local y la clave de cifrado. No se podrá recuperar.'),
+        content: const Text('¿Estás seguro? Esta acción eliminará la base de datos local y la clave de cifrado. Asegúrate de tener una copia de seguridad si es necesario o cuenta sincronizada.'),
         actions: [
           TextButton(onPressed: () => Navigator.of(context).pop(false), child: const Text('Cancelar')),
           TextButton(onPressed: () => Navigator.of(context).pop(true), child: const Text('Borrar', style: TextStyle(color: Colors.red))),
@@ -65,12 +83,88 @@ class _SettingsScreenState extends State<SettingsScreen> {
     }
   }
 
+  Future<void> _forceSync() async {
+    if (_isBusy || _isSyncing) {
+      return;
+    }
+
+    setState(() {
+      _isSyncing = true;
+    });
+
+    try {
+      await widget.onForceSync();
+
+      if (!mounted) return;
+
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('Sincronización forzada completada.')),
+      );
+    } catch (error) {
+      if (!mounted) return;
+
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(content: Text('Error al forzar la sincronización: $error')),
+      );
+    } finally {
+      if (!mounted) return;
+
+      setState(() {
+        _isSyncing = false;
+      });
+    }
+  }
+
+  Future<void> _selectThemeColor(Color color) async {
+    if (_isThemeSaving || _selectedSeedColor == color) {
+      return;
+    }
+
+    final Color previousColor = _selectedSeedColor;
+    setState(() {
+      _selectedSeedColor = color;
+      _isThemeSaving = true;
+    });
+
+    try {
+      await widget.onThemeColorSelected(color);
+    } catch (error) {
+      if (!mounted) {
+        return;
+      }
+
+      setState(() {
+        _selectedSeedColor = previousColor;
+      });
+
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(content: Text('No se pudo guardar el color: $error')),
+      );
+    } finally {
+      if (mounted) {
+        setState(() {
+          _isThemeSaving = false;
+        });
+      }
+    }
+  }
+
   @override
   void initState() {
     super.initState();
+    _selectedSeedColor = widget.currentSeedColor;
     _loadEndpoint();
   }
 
+  @override
+  void didUpdateWidget(covariant SettingsScreen oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    if (oldWidget.currentSeedColor != widget.currentSeedColor &&
+        widget.currentSeedColor != _selectedSeedColor) {
+      _selectedSeedColor = widget.currentSeedColor;
+    }
+  }
+
   Future<void> _loadEndpoint() async {
     final String endpoint = await ApiConfig.getEndpoint();
     if (!mounted) return;
@@ -125,6 +219,58 @@ class _SettingsScreenState extends State<SettingsScreen> {
     });
   }
 
+  Widget _buildThemeColorButton(Color color) {
+    final bool isSelected = _selectedSeedColor.value == color.value;
+    final Color foregroundColor =
+        ThemeData.estimateBrightnessForColor(color) == Brightness.dark
+            ? Colors.white
+            : Colors.black;
+
+    return Semantics(
+      button: true,
+      selected: isSelected,
+      label: 'Color ${color.value.toRadixString(16)}',
+      child: Tooltip(
+        message: isSelected ? 'Color actual' : 'Usar este color',
+        child: InkWell(
+          onTap: _isThemeSaving ? null : () => _selectThemeColor(color),
+          borderRadius: BorderRadius.circular(12),
+          child: AnimatedContainer(
+            duration: const Duration(milliseconds: 180),
+            width: 44,
+            height: 44,
+            decoration: BoxDecoration(
+              color: color,
+              borderRadius: BorderRadius.circular(12),
+              border: Border.all(
+                color: isSelected ? Colors.white : Colors.white24,
+                width: isSelected ? 2.5 : 1.2,
+              ),
+              boxShadow: [
+                BoxShadow(
+                  color: Colors.black.withValues(alpha: 0.25),
+                  blurRadius: 8,
+                  offset: const Offset(0, 3),
+                ),
+              ],
+            ),
+            child: Stack(
+              alignment: Alignment.center,
+              children: [
+                if (isSelected)
+                  Icon(
+                    Icons.check,
+                    size: 22,
+                    color: foregroundColor,
+                  ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
   @override
   void dispose() {
     _endpointController.dispose();
@@ -151,6 +297,56 @@ class _SettingsScreenState extends State<SettingsScreen> {
     _endpointController.text = endpoint;
     ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('Endpoint restaurado al valor por defecto')));
   }
+
+  Widget _buildResponsiveInputActionsRow({
+    required Widget input,
+    required List<Widget> actions,
+  }) {
+    return LayoutBuilder(
+      builder: (context, constraints) {
+        final bool isCompact = constraints.maxWidth < 600;
+
+        if (isCompact) {
+          return Column(
+            crossAxisAlignment: CrossAxisAlignment.stretch,
+            children: [
+              SizedBox(width: double.infinity, child: input),
+              const SizedBox(height: 8),
+              Align(
+                alignment: Alignment.centerRight,
+                child: Wrap(
+                  alignment: WrapAlignment.end,
+                  spacing: 8,
+                  runSpacing: 8,
+                  children: actions,
+                ),
+              ),
+            ],
+          );
+        }
+
+        return Row(
+          crossAxisAlignment: CrossAxisAlignment.center,
+          children: [
+            Expanded(child: input),
+            const SizedBox(width: 8),
+            Center(
+              child: Row(
+                mainAxisSize: MainAxisSize.min,
+                children: [
+                  for (int index = 0; index < actions.length; index++) ...[
+                    if (index > 0) const SizedBox(width: 8),
+                    actions[index],
+                  ],
+                ],
+              ),
+            ),
+          ],
+        );
+      },
+    );
+  }
+
   Widget build(BuildContext context) {
     return Scaffold(
       body: Container(
@@ -181,118 +377,143 @@ class _SettingsScreenState extends State<SettingsScreen> {
                   child: Column(
                     crossAxisAlignment: CrossAxisAlignment.start,
                     children: [
-                      ElevatedButton.icon(
-                        style: ElevatedButton.styleFrom(backgroundColor: Colors.redAccent),
-                        onPressed: _isBusy ? null : _confirmAndDeleteAll,
-                        icon: _isBusy ? const SizedBox(width: 16, height: 16, child: CircularProgressIndicator(strokeWidth: 2)) : const Icon(Icons.delete_forever),
-                        label: const Text('Borrar todos los datos'),
+                      Row(
+                        children: [
+                          const Expanded(
+                            child: Text('Borrar datos locales:'),
+                          ),
+                          ElevatedButton.icon(
+                            style: ElevatedButton.styleFrom(
+                              backgroundColor: Colors.redAccent,
+                              foregroundColor: Colors.white,
+                              textStyle: const TextStyle(fontWeight: FontWeight.w600),
+                            ),
+                            onPressed: _isBusy ? null : _confirmAndDeleteAll,
+                            icon: _isBusy
+                                ? const SizedBox(
+                                    width: 16,
+                                    height: 16,
+                                    child: CircularProgressIndicator(strokeWidth: 2),
+                                  )
+                                : const Icon(Icons.delete_forever),
+                            label: const Text('Borrar'),
+                          ),
+                        ],
                       ),
                       const SizedBox(height: 16),
-                      const Text('Esto cerrará el vault actual y eliminará la base de datos local junto con la clave de cifrado.'),
+                      Row(
+                        children: [
+                          const Expanded(
+                            child: Text('Forzar sincronizacion total:'),
+                          ),
+                          ElevatedButton.icon(
+                            onPressed: (_isBusy || _isSyncing) ? null : _forceSync,
+                            icon: _isSyncing
+                                ? const SizedBox(
+                                    width: 16,
+                                    height: 16,
+                                    child: CircularProgressIndicator(strokeWidth: 2),
+                                  )
+                                : const Icon(Icons.sync),
+                            label: const Text('Sincronizar'),
+                          ),
+                        ],
+                      ),
+                      const SizedBox(height: 24),
+                      const Text('Color del esquema'),
+                      const SizedBox(height: 8),
+                      Wrap(
+                        spacing: 12,
+                        runSpacing: 12,
+                        children: [
+                          for (final Color color in _themeColorOptions)
+                            _buildThemeColorButton(color),
+                        ],
+                      ),
                       const SizedBox(height: 24),
                       const Text('API endpoint (ej: http://localhost:3000/api)'),
                       const SizedBox(height: 8),
-                      Row(
-                        crossAxisAlignment: CrossAxisAlignment.start,
-                        children: [
-                          Expanded(
-                            child: _endpointLoading
-                                ? const SizedBox(height: 48, child: Center(child: CircularProgressIndicator()))
-                                : TextField(
-                                    controller: _endpointController,
-                                    style: const TextStyle(color: Colors.white),
-                                    keyboardType: TextInputType.url,
-                                    decoration: InputDecoration(
-                                      labelText: 'API endpoint',
-                                      labelStyle: TextStyle(color: Colors.white.withValues(alpha: 0.7)),
-                                      filled: true,
-                                      fillColor: Colors.white.withValues(alpha: 0.05),
-                                      border: OutlineInputBorder(
-                                        borderRadius: BorderRadius.circular(14),
-                                        borderSide: BorderSide(color: Colors.white.withValues(alpha: 0.12)),
-                                      ),
-                                      enabledBorder: OutlineInputBorder(
-                                        borderRadius: BorderRadius.circular(14),
-                                        borderSide: BorderSide(color: Colors.white.withValues(alpha: 0.12)),
-                                      ),
-                                      focusedBorder: OutlineInputBorder(
-                                        borderRadius: BorderRadius.circular(14),
-                                        borderSide: const BorderSide(color: Colors.amber, width: 1.2),
-                                      ),
-                                    ),
+                      _buildResponsiveInputActionsRow(
+                        input: _endpointLoading
+                            ? const SizedBox(height: 48, child: Center(child: CircularProgressIndicator()))
+                            : TextField(
+                                controller: _endpointController,
+                                style: const TextStyle(color: Colors.white),
+                                keyboardType: TextInputType.url,
+                                decoration: InputDecoration(
+                                  labelText: 'API endpoint',
+                                  labelStyle: TextStyle(color: Colors.white.withValues(alpha: 0.7)),
+                                  filled: true,
+                                  fillColor: Colors.white.withValues(alpha: 0.05),
+                                  border: OutlineInputBorder(
+                                    borderRadius: BorderRadius.circular(14),
+                                    borderSide: BorderSide(color: Colors.white.withValues(alpha: 0.12)),
                                   ),
+                                  enabledBorder: OutlineInputBorder(
+                                    borderRadius: BorderRadius.circular(14),
+                                    borderSide: BorderSide(color: Colors.white.withValues(alpha: 0.12)),
+                                  ),
+                                  focusedBorder: OutlineInputBorder(
+                                    borderRadius: BorderRadius.circular(14),
+                                    borderSide: const BorderSide(color: Colors.amber, width: 1.2),
+                                  ),
+                                ),
+                              ),
+                        actions: [
+                          ElevatedButton(
+                            onPressed: _endpointLoading ? null : _saveEndpoint,
+                            child: const Text('Guardar'),
                           ),
-                          const SizedBox(width: 8),
-                          Column(
-                            mainAxisSize: MainAxisSize.min,
-                            children: [
-                              ElevatedButton(
-                                onPressed: _endpointLoading ? null : _saveEndpoint,
-                                child: const Text('Guardar'),
-                              ),
-                              const SizedBox(height: 8),
-                              OutlinedButton(
-                                onPressed: _endpointLoading ? null : _resetEndpoint,
-                                child: const Text('Restaurar'),
-                              ),
-                            ],
+                          OutlinedButton(
+                            onPressed: _endpointLoading ? null : _resetEndpoint,
+                            child: const Text('Restaurar'),
                           ),
                         ],
                       ),
                       const SizedBox(height: 24),
                       const Text('Clave de cifrado local'),
                       const SizedBox(height: 8),
-                      Row(
-                        crossAxisAlignment: CrossAxisAlignment.start,
-                        children: [
-                          Expanded(
-                            child: TextField(
-                              controller: _encryptionKeyController,
-                              readOnly: true,
-                              obscureText: !_encryptionKeyVisible,
-                              enableSuggestions: false,
-                              autocorrect: false,
-                              style: const TextStyle(color: Colors.white),
-                              decoration: InputDecoration(
-                                labelText: _encryptionKeyVisible ? 'Clave de cifrado' : 'Oculta hasta pulsar mostrar',
-                                labelStyle: TextStyle(color: Colors.white.withValues(alpha: 0.7)),
-                                filled: true,
-                                fillColor: Colors.white.withValues(alpha: 0.05),
-                                border: OutlineInputBorder(
-                                  borderRadius: BorderRadius.circular(14),
-                                  borderSide: BorderSide(color: Colors.white.withValues(alpha: 0.12)),
-                                ),
-                                enabledBorder: OutlineInputBorder(
-                                  borderRadius: BorderRadius.circular(14),
-                                  borderSide: BorderSide(color: Colors.white.withValues(alpha: 0.12)),
-                                ),
-                                focusedBorder: OutlineInputBorder(
-                                  borderRadius: BorderRadius.circular(14),
-                                  borderSide: const BorderSide(color: Colors.amber, width: 1.2),
-                                ),
-                              ),
+                      _buildResponsiveInputActionsRow(
+                        input: TextField(
+                          controller: _encryptionKeyController,
+                          readOnly: true,
+                          obscureText: !_encryptionKeyVisible,
+                          enableSuggestions: false,
+                          autocorrect: false,
+                          style: const TextStyle(color: Colors.white),
+                          decoration: InputDecoration(
+                            labelText: _encryptionKeyVisible ? 'Clave de cifrado' : 'Oculta hasta pulsar mostrar',
+                            labelStyle: TextStyle(color: Colors.white.withValues(alpha: 0.7)),
+                            filled: true,
+                            fillColor: Colors.white.withValues(alpha: 0.05),
+                            border: OutlineInputBorder(
+                              borderRadius: BorderRadius.circular(14),
+                              borderSide: BorderSide(color: Colors.white.withValues(alpha: 0.12)),
+                            ),
+                            enabledBorder: OutlineInputBorder(
+                              borderRadius: BorderRadius.circular(14),
+                              borderSide: BorderSide(color: Colors.white.withValues(alpha: 0.12)),
+                            ),
+                            focusedBorder: OutlineInputBorder(
+                              borderRadius: BorderRadius.circular(14),
+                              borderSide: const BorderSide(color: Colors.amber, width: 1.2),
                             ),
                           ),
-                          const SizedBox(width: 8),
-                          Column(
-                            mainAxisSize: MainAxisSize.min,
-                            children: [
-                              ElevatedButton(
-                                onPressed: _encryptionKeyLoading ? null : _loadEncryptionKey,
-                                child: _encryptionKeyLoading
-                                    ? const SizedBox(
-                                        width: 16,
-                                        height: 16,
-                                        child: CircularProgressIndicator(strokeWidth: 2),
-                                      )
-                                    : const Text('Mostrar'),
-                              ),
-                              const SizedBox(height: 8),
-                              OutlinedButton(
-                                onPressed: _encryptionKeyVisible ? _hideEncryptionKey : null,
-                                child: const Text('Ocultar'),
-                              ),
-                            ],
+                        ),
+                        actions: [
+                          ElevatedButton(
+                            onPressed: _encryptionKeyLoading ? null : _loadEncryptionKey,
+                            child: _encryptionKeyLoading
+                                ? const SizedBox(
+                                    width: 16,
+                                    height: 16,
+                                    child: CircularProgressIndicator(strokeWidth: 2),
+                                  )
+                                : const Text('Mostrar'),
+                          ),
+                          OutlinedButton(
+                            onPressed: _encryptionKeyVisible ? _hideEncryptionKey : null,
+                            child: const Text('Ocultar'),
                           ),
                         ],
                       ),

lib/theme/app_theme.dart

@@ -1,17 +1,22 @@
 import 'package:flutter/material.dart';
 
 class AppTheme {
-  static ThemeData get theme {
+  static ThemeData theme({Color seedColor = Colors.amber}) {
+    final Brightness foregroundBrightness =
+        ThemeData.estimateBrightnessForColor(seedColor);
+    final Color foregroundColor =
+        foregroundBrightness == Brightness.dark ? Colors.white : Colors.black;
+
     return ThemeData(
       useMaterial3: true,
       scaffoldBackgroundColor: const Color.fromRGBO(31, 32, 33, 1),
       colorScheme: ColorScheme.fromSeed(
-        seedColor: Colors.amber,
+        seedColor: seedColor,
         brightness: Brightness.dark,
       ),
-      floatingActionButtonTheme: const FloatingActionButtonThemeData(
-        backgroundColor: Colors.amber,
-        foregroundColor: Colors.black,
+      floatingActionButtonTheme: FloatingActionButtonThemeData(
+        backgroundColor: seedColor,
+        foregroundColor: foregroundColor,
       ),
     );
   }