import 'package:flutter_bloc/flutter_bloc.dart';
import '../../models/models.dart';
import 'wishlist_event.dart';
import 'wishlist_state.dart';

class WishlistBloc extends Bloc<WishlistEvent, WishlistState> {
  WishlistBloc() : super(WishlistState.initial()) {
    on<LoadWishlist>(_onLoadWishlist);
    on<RemoveFromWishlist>(_onRemoveFromWishlist);
    on<SearchWishlist>(_onSearchWishlist);
    on<MoveToLibrary>(_onMoveToLibrary);
  }

  static List<Book> get _initialBooks => [
        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,
        ),
      ];

  void _onLoadWishlist(LoadWishlist event, Emitter<WishlistState> emit) {
    final wishlistBooks = _initialBooks.where((book) {
      return book.status == BookStatus.wantToRead || book.isFavorite;
    }).toList();
    
    emit(state.copyWith(
      books: wishlistBooks,
      filteredBooks: wishlistBooks,
      isLoading: false,
    ));
  }

  void _onRemoveFromWishlist(RemoveFromWishlist event, Emitter<WishlistState> emit) {
    final updatedBooks = state.books.where((book) => book.id != event.bookId).toList();
    final updatedFiltered = state.filteredBooks.where((book) => book.id != event.bookId).toList();
    
    emit(state.copyWith(
      books: updatedBooks,
      filteredBooks: updatedFiltered,
    ));
  }

  void _onSearchWishlist(SearchWishlist event, Emitter<WishlistState> emit) {
    final query = event.query.toLowerCase();
    final filtered = state.books.where((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 _onMoveToLibrary(MoveToLibrary event, Emitter<WishlistState> emit) {
    final updatedBooks = state.books.map((book) {
      if (book.id == event.bookId) {
        return book.copyWith(
          status: BookStatus.reading,
        );
      }
      return book;
    }).toList();
    
    final updatedFiltered = state.filteredBooks.map((book) {
      if (book.id == event.bookId) {
        return book.copyWith(
          status: BookStatus.reading,
        );
      }
      return book;
    }).toList();
    
    emit(state.copyWith(
      books: updatedBooks,
      filteredBooks: updatedFiltered,
      movedBookId: event.bookId,
    ));
  }
}