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export class BooksQuery extends QueryEntity<BooksState, Book> {
  
  constructor(protected store: BooksStore) {
    super(store);
  }

  selectSearchTerm$ = this.select(state => state.searchTerm);
  selectResultIds$ = this.select(state => state.resultIds);
  selectCollection$ = this.select(state => state.collection);

  isInCollection$ = this.selectCollection$.pipe(map(ids => ids.includes(this.getActiveId()) === true))

  get getSearchTerm() {
    return this.getSnapshot().searchTerm;
  }
  
  get collection() {
    return this.getSnapshot().collection;
  }

  get nonCollectionBooks(): string[] {
    return this.getAll({
      filterBy: ({ id }) => this.collection.includes(id) === false
    }).map(({ id }) => id);
  }

}