import 'package:flutter_bloc/flutter_bloc.dart';
import '../../../models/models.dart';
import 'library_event.dart';
import 'library_state.dart';

class LibraryBloc extends Bloc<LibraryEvent, LibraryState> {
  LibraryBloc() : super(LibraryState.initial()) {
    on<LoadBooks>(_onLoadBooks);
    on<SearchBooks>(_onSearchBooks);
    on<BookSelected>(_onBookSelected);
    on<FilterByStatus>(_onFilterByStatus);
    on<ClearFilters>(_onClearFilters);
  }

  static List<Book> get _initialBooks => [
        createBook(
          id: '1',
          title: 'Великий Гэтсби',
          author: 'Ф. Скотт Фицджеральд',
          genre: 'Classic',
          annotation:
              'История о несбывшейся любви и трагедии американской мечты на фоне бурных двадцатых годов.',
          coverUrl: 'https://picsum.photos/seed/gatsby/400/600',
          pages: 208,
          language: 'English',
          publishedYear: 1925,
          rating: 4.8,
          status: BookStatus.reading,
          progress: 45,
          isFavorite: true,
        ),
        createBook(
          id: '2',
          title: '1984',
          author: 'Джордж Оруэлл',
          genre: 'Dystopian',
          annotation:
              'Антиутопия о тоталитарном государстве, где мысли контролируются, а правда переменчива.',
          coverUrl: 'https://picsum.photos/seed/1984/400/600',
          pages: 328,
          language: 'English',
          publishedYear: 1949,
          rating: 4.9,
          status: BookStatus.wantToRead,
          isFavorite: true,
        ),
        createBook(
          id: '3',
          title: 'Дюна',
          author: 'Фрэнк Герберт',
          genre: 'Sci-Fi',
          annotation:
              'Эпическая сага о борьбе за власть над самой важной планетой во Вселенной.',
          coverUrl: 'https://picsum.photos/seed/dune/400/600',
          pages: 896,
          language: 'English',
          publishedYear: 1965,
          rating: 4.7,
          status: BookStatus.reading,
          progress: 12,
          isFavorite: false,
        ),
        createBook(
          id: '4',
          title: 'Хоббит',
          author: 'Дж. Р. Р. Толкин',
          genre: 'Fantasy',
          annotation:
              'Путешествие Бильбо Бэггинса туда и обратно в поисках сокровищ гномов.',
          coverUrl: 'https://picsum.photos/seed/hobbit/400/600',
          pages: 310,
          language: 'English',
          publishedYear: 1937,
          rating: 4.9,
          status: BookStatus.done,
          isFavorite: false,
        ),
      ];

  void _onLoadBooks(LoadBooks event, Emitter<LibraryState> emit) {
    emit(state.copyWith(
      books: _initialBooks,
      filteredBooks: _initialBooks,
      isLoading: false,
    ));
  }

  void _onSearchBooks(SearchBooks event, Emitter<LibraryState> emit) {
    final query = event.query.toLowerCase();
    final filtered = state.books.where((Book book) {
      return book.title.toLowerCase().contains(query) ||
          book.author.toLowerCase().contains(query) ||
          book.genre.toLowerCase().contains(query);
    }).toList();
    
    emit(state.copyWith(
      searchQuery: event.query,
      filteredBooks: filtered,
    ));
  }

  void _onBookSelected(BookSelected event, Emitter<LibraryState> emit) {
    emit(state.copyWith(selectedBook: event.book));
  }

  void _onFilterByStatus(FilterByStatus event, Emitter<LibraryState> emit) {
    final filtered = state.books.where((Book book) {
      return book.status == event.status;
    }).toList();
    
    emit(state.copyWith(
      statusFilter: event.status,
      filteredBooks: filtered,
    ));
  }

  void _onClearFilters(ClearFilters event, Emitter<LibraryState> emit) {
    emit(state.copyWith(
      searchQuery: '',
      statusFilter: null,
      filteredBooks: state.books,
    ));
  }
}