library

import { libraryShelf } from '../common/library-shelf.js';

export class Library {
    #shelves = {
      1: [],
      2: [],
      3: [],
      4: [],
      99: [],
    };
    set _shelves(obj) {
      for (const keys in obj) {
        const shelf = keys;
        const book = obj[keys][0];
        this.addBook(book, shelf);
      }


    }
    get _shelves() {
      return this.#shelves;
    }

    addBook(book, shelf) {
      if (!libraryShelf[shelf]) {
        throw new Error('Not a valid shelf.');
      }
      this.#shelves[shelf].push(book);
    }
    get _shelves() {
      return this.#shelves;
    }
    printBooks() {
      let outPut = '';
      // eslint-disable-next-line guard-for-in, prefer-const
      for ( let keys in this.#shelves) {
        if (this.#shelves[keys].length !== 0) {
          outPut += ('==' + libraryShelf[keys] + '==' +'\n');
          this.#shelves[keys].map(el =>{
            outPut += el.title + ', by ' + el.authors + ', ' + el.pages + ' pages' + '\n';
          });
        }
      }
      if (outPut === '') {
        return 'No books added';
      } else {
        return outPut;
      }
    }
}