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

class ThemeBloc extends Bloc<ThemeEvent, ThemeState> {
  ThemeBloc() : super(ThemeState.init()) {
    on<ThemeEvent>(switchTheme);
  }

  void switchTheme(ThemeEvent event, Emitter<ThemeState> emit) {
    if (state.theme.brightness == Brightness.light) {
      emit(ThemeState.withBrightness(Brightness.dark));
    } else {
      emit(ThemeState.withBrightness(Brightness.light));
    }
  }
}

class ThemeEvent {}

class ThemeState {
  final ThemeData theme;
  static final ThemeData initTheme = ThemeData(
    colorScheme: ColorScheme.fromSeed(
        seedColor: Colors.lightBlue, brightness: Brightness.light),
  );

  ThemeState({required this.theme});

  factory ThemeState.init() {
    return ThemeState(theme: initTheme);
  }

  factory ThemeState.withBrightness(Brightness brightness) {
    return ThemeState(
        theme: ThemeData(
      colorScheme: ColorScheme.fromSeed(
          seedColor: Colors.lightBlue, brightness: brightness),
    ));
  }
}