require 'reader'
require 'order'
require 'author'
require 'file_worker'
require 'library_backup_manager'
require 'library'
require 'book'
require 'find_most_active_reader'
require 'find_most_popular_book'
require 'find_readers_number_for_book'


class Library
  include LibraryBackupManager
  
  attr_accessor :books, :orders, :readers, :authors

  def initialize
    @books = []
    @orders = []
    @readers = []
    @authors = []
  end

  def find_author(author_name)
    found_author = authors.find { |author| author.name == author_name }
    fail "Author #{author_name} wasn't found!" unless found_author
    found_author
  end

  def find_book(book_title)
    found_book = books.find { |book| book.title == book_title }
    fail "Book #{book_title} wasn't found!" unless found_book
    found_book
  end

  def find_reader(reader_name)
    found_reader = readers.find { |reader| reader.name == reader_name }
    fail "reader #{reader_name} wasn't found!" unless found_reader
    found_reader
  end

  def save_resource(resourse)
    case resourse.class.name
    when 'Book'
      books.push(resourse) unless books.include?(resourse)
    when 'Order'
      orders.push(resourse)
    when 'Reader'
      readers.push(resourse)
    when 'Author'
      authors.push(resourse)
    end
  end
end