ready for checking commit

data/library.yml

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+---
+:authors:
+- &1 !ruby/object:Author
+  name: J. Roaling
+  biography: Hi
+- &2 !ruby/object:Author
+  name: S. King
+  biography: Hello
+- &3 !ruby/object:Author
+  name: M. Molier
+  biography: Hello
+- &4 !ruby/object:Author
+  name: G. Martin
+  biography: Hello
+- &5 !ruby/object:Author
+  name: M. Tven
+  biography: Hello
+- !ruby/object:Author
+  name: F. Kafka
+  biography: Hello
+- &6 !ruby/object:Author
+  name: R. Somsmert
+  biography: Hello
+:books:
+- !ruby/object:Book
+  title: Harry Potter I
+  author: *1
+- &8 !ruby/object:Book
+  title: Harry Potter II
+  author: *1
+- &10 !ruby/object:Book
+  title: Harry Potter III
+  author: *1
+- &12 !ruby/object:Book
+  title: Dark Tower
+  author: *2
+- &14 !ruby/object:Book
+  title: Mizo
+  author: *3
+- &15 !ruby/object:Book
+  title: Game of thrones I
+  author: *4
+- !ruby/object:Book
+  title: Tom Sawyer
+  author: *5
+- !ruby/object:Book
+  title: All about us
+  author: *6
+:readers:
+- &16 !ruby/object:Reader
+  name: Denis
+  email: dzem@gmail.com
+  city: Dnipro
+  street: GS
+  house: 140
+- &9 !ruby/object:Reader
+  name: Test
+  email: test@gmail.com
+  city: Kiev
+  street: KM
+  house: 101
+- &11 !ruby/object:Reader
+  name: Testovskiy
+  email: testovskiy@gmail.com
+  city: Uzhgorod
+  street: KL
+  house: 22
+- &13 !ruby/object:Reader
+  name: Testarius
+  email: testarius@gmail.com
+  city: Odessa
+  street: BH
+  house: 71
+- &7 !ruby/object:Reader
+  name: Testevich
+  email: testarich@gmail.com
+  city: Kharkiv
+  street: YM
+  house: 41
+:orders:
+- !ruby/object:Order
+  reader: *7
+  book: *8
+  date: 2016-10-19
+- !ruby/object:Order
+  reader: *9
+  book: *10
+  date: 2016-10-19
+- !ruby/object:Order
+  reader: *11
+  book: *12
+  date: 2016-10-19
+- !ruby/object:Order
+  reader: *13
+  book: *14
+  date: 2016-10-19
+- !ruby/object:Order
+  reader: *7
+  book: *15
+  date: 2016-10-19
+- !ruby/object:Order
+  reader: *7
+  book: *12
+  date: 2016-10-19
+- !ruby/object:Order
+  reader: *16
+  book: *12
+  date: 2016-10-19
+- !ruby/object:Order
+  reader: *13
+  book: *12
+  date: 2016-10-19
+- !ruby/object:Order
+  reader: *11
+  book: *10
+  date: 2016-10-19
+- !ruby/object:Order
+  reader: *9
+  book: *8
+  date: 2016-10-19

index.rb

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+require 'yaml'
+Dir['./lib/*.rb'].each { |file| require file }
+
+library = Library.new
+library.load('library')
+author1 = Author.new('J. Roaling', 'Hi')
+author2 = Author.new('S. King', 'Hello')
+author3 = Author.new('M. Molier', 'Hello')
+author4 = Author.new('G. Martin', 'Hello')
+author5 = Author.new('M. Tven', 'Hello')
+author6 = Author.new('F. Kafka', 'Hello')
+author7 = Author.new('R. Somsmert', 'Hello')
+#
+book = Book.new('Harry Potter I', author1)
+book1 = Book.new('Harry Potter II', author1)
+book2 = Book.new('Harry Potter III', author1)
+book3 = Book.new('Dark Tower', author2)
+book4 = Book.new('Mizo', author3)
+book5 = Book.new('Game of thrones I', author4)
+book6 = Book.new('Game of thrones II', author4)
+book6 = Book.new('Tom Sawyer', author5)
+book7 = Book.new('All about us', author7)
+#
+reader1 = Reader.new('Denis', 'dzem@gmail.com', 'Dnipro', 'GS', 140)
+reader2 = Reader.new('Test', 'test@gmail.com', 'Kiev', 'KM', 101)
+reader3 = Reader.new('Testovskiy', 'testovskiy@gmail.com', 'Uzhgorod', 'KL', 22)
+reader4 = Reader.new('Testarius', 'testarius@gmail.com', 'Odessa', 'BH', 71)
+reader5 = Reader.new('Testevich', 'testarich@gmail.com', 'Kharkiv', 'YM', 41)
+#
+library.add(
+    author1, author2, author3, author4, author5, author6, author7,
+    book, book1, book2, book3, book4, book5, book6, book7,
+    reader1, reader2, reader3, reader4, reader5
+)
+#
+order = Order.new(library.readers[0], library.books[0])
+order1 = Order.new(library.readers[4], library.books[1])
+order2 = Order.new(library.readers[1], library.books[2])
+order3 = Order.new(library.readers[2], library.books[3])
+order4 = Order.new(library.readers[3], library.books[4])
+order5 = Order.new(library.readers[4], library.books[5])
+order6 = Order.new(library.readers[4], library.books[3])
+order7 = Order.new(library.readers[0], library.books[3])
+order8 = Order.new(library.readers[3], library.books[3])
+order9 = Order.new(library.readers[2], library.books[2])
+order10 = Order.new(library.readers[1], library.books[1])
+order11 = Order.new(library.readers[4], library.books[3])
+
+library.save('library')
+
+puts library.top_reader.name
+puts library.top_book.title
+puts library.top_books_statistics(12)

lib/author.rb

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+class Author
+  attr_accessor :name, :biography
+
+  def initialize(name, biography = 'No biography yet')
+    @name = name
+    @biography = biography
+  end
+
+  def ==(other)
+    name == other.name if other.instance_of? Author
+  end
+end

lib/book.rb

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+class Book
+  attr_accessor :title, :author
+
+  def initialize(title, author)
+    @title = title
+    @author = author
+  end
+
+  def ==(other)
+    check_author(other) && check_title(other) if other.is_a? Book
+  end
+
+  def check_author(other)
+    author == other.author
+  end
+
+  def check_title(other)
+    title == other.title
+  end
+end

lib/library.rb

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+class Library
+  include Loader
+  attr_accessor :authors, :readers, :books, :orders
+
+  def initialize
+    @authors = []
+    @books = []
+    @readers = []
+    @orders = []
+  end
+
+  def add(name, *items, username)
+    items.each do |item|
+      case item
+        when Book
+          books.push(item) if !books.include?(item) && authors.include?(item.author)
+        when Order
+          orders.push(item) if readers.include?(item.reader) && books.include?(item.book)
+        when Reader
+          readers.push(item) unless readers.include?(item)
+        when Author
+          authors.push(item) unless authors.include?(item)
+        else
+          raise 'Undefined element'
+      end
+    end
+  end
+
+  def top_reader
+    sort_by(:reader).first
+  end
+
+  def top_book
+    sort_by(:book).first
+  end
+
+  def top_books_statistics(number)
+    raise 'Annormal quantity of books' if number > orders.count
+    top_n_books = sort_by(:book, number)
+    top_n_books.map{|(_,orders)| orders}.flatten.map(&:reader).uniq.count
+  end
+
+  private
+
+  def sort_by(by, quantity = nil)
+    orders.group_by(&by).max_by(quantity){|_, orders| orders.count}
+  end
+end

lib/loader.rb

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+module Loader
+  BACKUP_NAME = 'data'
+  PATH = './data/'
+  EXTENSION = '.yml'
+
+  def load(file_name = BACKUP_NAME)
+    file_name += EXTENSION.to_s
+    pull_data(file_name) if File.exist?(PATH + file_name)
+  end
+
+  def aquire_data
+    {
+      authors: @authors,
+      books: @books,
+      readers: @readers,
+      orders: @orders
+    }
+  end
+
+  def pull_data(filename)
+    file = File.open(PATH + filename)
+    data = YAML.load(file)
+    @authors = data[:authors]
+    @books = data[:books]
+    @readers = data[:readers]
+    @orders = data[:orders]
+    file.close
+  end
+
+  def save(file_name = BACKUP_NAME)
+    full_path = PATH.to_s + file_name.to_s + EXTENSION
+    data = YAML.dump(aquire_data)
+    File.new(full_path, 'w') unless File.exist?(full_path)
+    File.write(full_path, data)
+  end
+end

lib/order.rb

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+class Order
+  attr_accessor :reader, :book, :date
+
+  def initialize(reader, book, date = Date.today)
+    raise 'Unnormed data' unless reader.instance_of?(Reader) && book.instance_of?(Book)
+      @reader = reader
+      @book = book
+      @date = date
+  end
+end

lib/reader.rb

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+class Reader
+  attr_accessor :name, :email, :city, :street, :house
+
+  def initialize(name, email, city, street, house)
+    @name = name
+    @email = email
+    @city = city
+    @street = street
+    @house = house
+  end
+
+  def ==(other)
+    @email == other.email if other.instance_of?Reader
+  end
+end