using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;



public class Encyclopedia : Book { }
public class TreasureIsland : Book { }
public class LordOfTheRings : Book { }
public class Dracula : Book { }
public class Book { }

public abstract class BookReader{
  public BookReader(){
    Book = BuyBook();
  }

  public Book Book { get; set; }

  public abstract Book BuyBook();

  public Book BuyBook<T>() where T : Book, new(){
    return new T();
  }

  public void DisplayOwnedBooks(){
    string message;
    message = string.Format("Owned book: {0}", Book);
    Console.WriteLine(message);
  }
}
public abstract class GenericReader{
  public GenericReader()
  {
     Book = BuyBook();
  }

  public Book Book { get; set; }
  public abstract Book BuyBook();
  public Book BuyBook<T>() where T : Book, new()
    {
      return new T();
    }
  public void DisplayOwnedBooks()
    {
      string message;
      message = string.Format("Owned book: {0}", Book);
      Console.WriteLine(message);
    }
  }


public class Encyklopedia : GenericReader{
  public override Book BuyBook(){
    return new Encyclopedia();
  }
}
public class AdventureBookReader : BookReader{
  public override Book BuyBook(){
    return new TreasureIsland();
  }
}
public class FantasyBookReader : BookReader{
  public override Book BuyBook(){
    return new LordOfTheRings();
  }
}
public class HorrorBookReader : BookReader{
  public override Book BuyBook(){
    return new Dracula();
  }
}

class MainClass{
  public static void Main (string[] args){
    GenericReader genericReader = new Encyklopedia();
    Book book = genericReader.BuyBook<Encyclopedia>();
    Console.WriteLine(book);

    Console.WriteLine("\n/* ********************************** */\n");

    List<BookReader> bookReaderList = new List<BookReader>();

    bookReaderList.Add(new AdventureBookReader());
    bookReaderList.Add(new FantasyBookReader());
    bookReaderList.Add(new HorrorBookReader());
    foreach (var reader in bookReaderList){
      Console.WriteLine(reader);
      Console.WriteLine(reader.Book + "\n");
    }
    Console.ReadKey();
  }
}