bookshelf/bookshelf_flutter/lib/bloc/book_details/book_details_bloc.dart

import 'package:flutter_bloc/flutter_bloc.dart';
import '../../models/models.dart';
import 'book_details_event.dart';
import 'book_details_state.dart';

class BookDetailsBloc extends Bloc<BookDetailsEvent, BookDetailsState> {
  BookDetailsBloc() : super(BookDetailsState.initial()) {
    on<LoadBookDetails>(_onLoadBookDetails);
    on<ToggleFavorite>(_onToggleFavorite);
    on<UpdateProgress>(_onUpdateProgress);
    on<UpdateStatus>(_onUpdateStatus);
    on<DeleteBook>(_onDeleteBook);
  }

  void _onLoadBookDetails(LoadBookDetails event, Emitter<BookDetailsState> emit) {
    emit(state.copyWith(
      book: event.book,
      isLoading: false,
    ));
  }

  void _onToggleFavorite(ToggleFavorite event, Emitter<BookDetailsState> emit) {
    if (state.book == null) return;
    
    final updatedBook = state.book!.copyWith(
      isFavorite: !state.book!.isFavorite,
    );
    
    emit(state.copyWith(
      book: updatedBook,
    ));
  }

  void _onUpdateProgress(UpdateProgress event, Emitter<BookDetailsState> emit) {
    if (state.book == null) return;
    
    final updatedBook = state.book!.copyWith(
      progress: event.progress,
      status: event.progress >= 100 ? BookStatus.done : BookStatus.reading,
    );
    
    emit(state.copyWith(
      book: updatedBook,
    ));
  }

  void _onUpdateStatus(UpdateStatus event, Emitter<BookDetailsState> emit) {
    if (state.book == null) return;
    
    final updatedBook = state.book!.copyWith(
      status: event.status,
    );
    
    emit(state.copyWith(
      book: updatedBook,
    ));
  }

  void _onDeleteBook(DeleteBook event, Emitter<BookDetailsState> emit) {
    emit(state.copyWith(
      isDeleted: true,
    ));
  }
}