calorimeter/lib/utils/theme_bloc.dart

import 'package:calorimeter/storage/storage.dart';
import 'package:flutter_bloc/flutter_bloc.dart';

class ThemeDataBloc extends Bloc<ThemeToggleEvent, ThemeState> {
  final FoodStorage storage;

  ThemeDataBloc(super.initialState, {required this.storage}) {
    on<ThemeToggleEvent>(switchTheme);
  }

  void switchTheme(ThemeToggleEvent event, Emitter<ThemeState> emit) async {
    String newBrightness = 'light';
    if (state.brightness == 'light') newBrightness = 'dark';

    persistTheme(newBrightness);

    emit(ThemeState(brightness: newBrightness));
  }

  void persistTheme(String brightness) async {
    storage.writeBrightness(brightness);
  }

  Future<String> getPersistedTheme() async {
    return storage.readBrightness();
  }
}

class ThemeToggleEvent {
  ThemeToggleEvent();
}

class ThemeState {
  final String brightness;

  ThemeState({required this.brightness});
}