bookshelf/books_flutter/lib/bloc/book_bloc.dart

import 'package:flutter_bloc/flutter_bloc.dart';
import '../models/models.dart';
import '../constants/constants.dart';

// Events
sealed class BookEvent {}

class AddBook extends BookEvent {
  final Book book;
  AddBook(this.book);
}

class UpdateBook extends BookEvent {
  final Book book;
  UpdateBook(this.book);
}

class DeleteBook extends BookEvent {
  final String id;
  DeleteBook(this.id);
}

class ToggleFavorite extends BookEvent {
  final String id;
  ToggleFavorite(this.id);
}

// State
class BookState {
  final List<Book> books;
  const BookState({required this.books});
}

// Bloc
class BookBloc extends Bloc<BookEvent, BookState> {
  BookBloc() : super(const BookState(books: initialBooks)) {
    on<AddBook>((event, emit) {
      emit(BookState(books: [...state.books, event.book]));
    });

    on<UpdateBook>((event, emit) {
      final updated = state.books.map((b) {
        return b.id == event.book.id ? event.book : b;
      }).toList();
      emit(BookState(books: updated));
    });

    on<DeleteBook>((event, emit) {
      emit(
        BookState(books: state.books.where((b) => b.id != event.id).toList()),
      );
    });

    on<ToggleFavorite>((event, emit) {
      final updated = state.books.map((b) {
        if (b.id != event.id) return b;
        return (
          id: b.id,
          title: b.title,
          author: b.author,
          genre: b.genre,
          annotation: b.annotation,
          coverUrl: b.coverUrl,
          pages: b.pages,
          language: b.language,
          publishedYear: b.publishedYear,
          rating: b.rating,
          status: b.status,
          progress: b.progress,
          isFavorite: !b.isFavorite,
        );
      }).toList();
      emit(BookState(books: updated));
    });
  }
}