buzz/mobile/lib/shared/theme/theme_provider.dart

import 'package:flutter/material.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';

class ThemeNotifier extends Notifier<ThemeMode> {
  @override
  ThemeMode build() => ThemeMode.system;

  void setThemeMode(ThemeMode themeMode) {
    state = themeMode;
  }

  void toggleTheme() {
    switch (state) {
      case ThemeMode.light:
        state = ThemeMode.dark;
        break;
      case ThemeMode.dark:
        state = ThemeMode.system;
        break;
      case ThemeMode.system:
        state = ThemeMode.light;
        break;
    }
  }
}

final themeProvider = NotifierProvider<ThemeNotifier, ThemeMode>(
  ThemeNotifier.new,
);