import 'package:flutter_bloc/flutter_bloc.dart';
import '../../models/models.dart';
import 'add_book_event.dart';
import 'add_book_state.dart';

class AddBookBloc extends Bloc<AddBookEvent, AddBookState> {
  AddBookBloc() : super(AddBookState.initial()) {
    on<InitializeForm>(_onInitializeForm);
    on<UpdateFormField>(_onUpdateFormField);
    on<ToggleFavorite>(_onToggleFavorite);
    on<ClearForm>(_onClearForm);
    on<SubmitBook>(_onSubmitBook);
  }

  void _onInitializeForm(InitializeForm event, Emitter<AddBookState> emit) {
    emit(state.copyWith(
      prefilledData: event.prefilledData,
      isLoading: false,
    ));

    if (event.prefilledData != null) {
      final data = event.prefilledData!;
      emit(state.copyWith(
        title: data['title'] as String? ?? '',
        author: data['author'] as String? ?? '',
        genre: data['genre'] as String? ?? '',
        annotation: data['annotation'] as String? ?? '',
        coverUrl: data['coverUrl'] as String? ?? '',
        pages: data['pages'] as int?,
        language: data['language'] as String? ?? '',
        publishedYear: data['publishedYear'] as int?,
        rating: data['rating'] as double? ?? 0.0,
        status: data['status'] as BookStatus? ?? BookStatus.wantToRead,
        progress: data['progress'] as int? ?? 0,
        isFavorite: data['isFavorite'] as bool? ?? false,
      ));
    }
  }

  void _onUpdateFormField(UpdateFormField event, Emitter<AddBookState> emit) {
    switch (event.field) {
      case 'title':
        emit(state.copyWith(title: event.value as String));
        break;
      case 'author':
        emit(state.copyWith(author: event.value as String));
        break;
      case 'genre':
        emit(state.copyWith(genre: event.value as String));
        break;
      case 'annotation':
        emit(state.copyWith(annotation: event.value as String));
        break;
      case 'coverUrl':
        emit(state.copyWith(coverUrl: event.value as String));
        break;
      case 'pages':
        emit(state.copyWith(pages: event.value as int?));
        break;
      case 'language':
        emit(state.copyWith(language: event.value as String));
        break;
      case 'publishedYear':
        emit(state.copyWith(publishedYear: event.value as int?));
        break;
      case 'rating':
        emit(state.copyWith(rating: event.value as double?));
        break;
      case 'status':
        emit(state.copyWith(status: event.value as BookStatus));
        break;
      case 'progress':
        emit(state.copyWith(progress: event.value as int?));
        break;
    }
  }

  void _onToggleFavorite(ToggleFavorite event, Emitter<AddBookState> emit) {
    emit(state.copyWith(isFavorite: !state.isFavorite));
  }

  void _onClearForm(ClearForm event, Emitter<AddBookState> emit) {
    emit(AddBookState.initial());
  }

  void _onSubmitBook(SubmitBook event, Emitter<AddBookState> emit) {
    final book = createBook(
      id: DateTime.now().millisecondsSinceEpoch.toString(),
      title: state.title.isNotEmpty ? state.title : 'Unknown',
      author: state.author.isNotEmpty ? state.author : 'Unknown',
      genre: state.genre.isNotEmpty ? state.genre : 'Unknown',
      annotation: state.annotation,
      coverUrl: state.coverUrl.isNotEmpty
          ? state.coverUrl
          : 'https://picsum.photos/seed/${DateTime.now().millisecondsSinceEpoch}/400/600',
      pages: state.pages,
      language: state.language,
      publishedYear: state.publishedYear,
      rating: state.rating,
      status: state.status,
      progress: state.progress,
      isFavorite: state.isFavorite,
    );

    emit(state.copyWith(
      submittedBook: book,
      isSubmitted: true,
    ));
  }
}