feat: settings page

lib/providers/theme_provider.dart

@@ -0,0 +1,99 @@
+import 'package:flutter/material.dart';
+import '../services/settings_service.dart' as settings;
+import '../theme/mono_theme.dart';
+
+class ThemeProvider extends ChangeNotifier {
+  late settings.SettingsService _settingsService;
+  settings.ThemeMode _themeMode = settings.ThemeMode.system;
+  late Brightness _systemBrightness;
+
+  ThemeProvider() {
+    _systemBrightness = WidgetsBinding.instance.platformDispatcher.platformBrightness;
+    _initializeSettings();
+
+    // Listen to system theme changes
+    WidgetsBinding.instance.platformDispatcher.onPlatformBrightnessChanged = () {
+      _systemBrightness = WidgetsBinding.instance.platformDispatcher.platformBrightness;
+      if (_themeMode == settings.ThemeMode.system) {
+        notifyListeners();
+      }
+    };
+  }
+
+  Future<void> _initializeSettings() async {
+    _settingsService = await settings.SettingsService.getInstance();
+    _themeMode = _settingsService.getThemeMode();
+    notifyListeners();
+  }
+
+  settings.ThemeMode get themeMode => _themeMode;
+
+  ThemeData get lightTheme => monoTheme(dark: false);
+  ThemeData get darkTheme => monoTheme(dark: true);
+
+  ThemeMode get materialThemeMode {
+    switch (_themeMode) {
+      case settings.ThemeMode.light:
+        return ThemeMode.light;
+      case settings.ThemeMode.dark:
+        return ThemeMode.dark;
+      case settings.ThemeMode.system:
+        return ThemeMode.system;
+    }
+  }
+
+  bool get isDarkMode {
+    switch (_themeMode) {
+      case settings.ThemeMode.light:
+        return false;
+      case settings.ThemeMode.dark:
+        return true;
+      case settings.ThemeMode.system:
+        return _systemBrightness == Brightness.dark;
+    }
+  }
+
+  Future<void> setThemeMode(settings.ThemeMode mode) async {
+    if (_themeMode != mode) {
+      _themeMode = mode;
+      await _settingsService.setThemeMode(mode);
+      notifyListeners();
+    }
+  }
+
+  String get themeModeDisplayName {
+    switch (_themeMode) {
+      case settings.ThemeMode.light:
+        return 'Light';
+      case settings.ThemeMode.dark:
+        return 'Dark';
+      case settings.ThemeMode.system:
+        return 'System';
+    }
+  }
+
+  IconData get themeModeIcon {
+    switch (_themeMode) {
+      case settings.ThemeMode.light:
+        return Icons.light_mode;
+      case settings.ThemeMode.dark:
+        return Icons.dark_mode;
+      case settings.ThemeMode.system:
+        return Icons.brightness_auto;
+    }
+  }
+
+  void toggleTheme() {
+    switch (_themeMode) {
+      case settings.ThemeMode.system:
+        setThemeMode(settings.ThemeMode.light);
+        break;
+      case settings.ThemeMode.light:
+        setThemeMode(settings.ThemeMode.dark);
+        break;
+      case settings.ThemeMode.dark:
+        setThemeMode(settings.ThemeMode.system);
+        break;
+    }
+  }
+}