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

namespace zad6
{


    abstract class Item : IComparable
    {
        protected string title;
        protected string author;
        protected double price;

        public abstract double VAT
        {
            get;
        }

        public abstract double returnPriceBrutto
        {
            get;
        }
        public override string ToString()
        {
            return String.Format("{0} {1} {2}", author ,  title ,  this.returnPriceBrutto);
        }
        public int CompareTo(object ob)
        {
            Item i1 = (Item) ob;
            if (this.returnPriceBrutto > i1.returnPriceBrutto)
            {
                return 1;
            }
            else if (this.returnPriceBrutto == i1.returnPriceBrutto)
            {
                return 0;
            }
            return -1;
        }
        public class ItemComparer : IComparer<Object>
        {
            public int Compare(Object x, Object y)
            {
                Item t1 = (Item)x;
                Item t2 = (Item)y;
                return string.Compare(t1.title, t2.title);
            }
        }
    }
    class Book : Item
    {
        protected string ISBN;
        protected uint pageNumber;
        protected string publisher;
        protected double vat;

        public Book(string title, string author, string ISBN, uint pageNumber, string publisher, double price, double vat)
        {
            this.price = price;
            this.title = title;
            this.author = author;
            this.ISBN = ISBN;
            this.pageNumber = pageNumber;
            this.publisher = publisher;
            this.vat = vat;
        }
        public override double VAT
        {
            get
            {
                return vat;
            }
        }
        public override double returnPriceBrutto
        {
            get
            {
                return Math.Round(price * (1 + vat), 2);
            }
        }


        public override string ToString()
        {
            return base.ToString()+String.Format(" {0} {1} {2}",ISBN,pageNumber,publisher);
        }

        public double WartoscVAT()
        {
            return returnPriceBrutto - price;
        }
    }


    class Program
    {
        static void Main(string[] args)
        {
            Book b1 = new Book("Pan Tadeusz", "Mickiewicz", "89312AKTA", 512, "PWN", 25.50, 0.08);
            Book b2 = new Book("Krzyżacy", "Sienkiewicz", "815132BGAT", 394, "Operon", 29.73, 0.08);

            Console.WriteLine(b1.ToString());
            Console.WriteLine(b2.ToString());

            Console.WriteLine(b1.CompareTo(b2));

            Book[] tablicaBook = new Book[2];
            tablicaBook[0] = b1;
            tablicaBook[1] = b2;
            Console.WriteLine(tablicaBook[0].ToString());
            Console.WriteLine(tablicaBook[1].ToString());
            Array.Sort(tablicaBook, new Item.ItemComparer());
            Console.WriteLine(tablicaBook[0].ToString());
            Console.WriteLine(tablicaBook[1].ToString());
            Console.ReadKey();
        }
    }
}