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



namespace Задача_1
{
    public class Item
    {
        public string Name { get;  }
        public double Price { get; }
        public int Quantity { get; }



        public Item(string itemName, double itemPrice, int itemQuantity)
        {
            Name = itemName;
            Price = itemPrice;
            Quantity = itemQuantity;
        }
        public override string ToString()
        {
            return $"{Name,10} {Price,14} {Quantity,14}";
        }
    }
    public class ShoppingCart //Зачем делать класс публичным?
    {
        private int _itemCount;
        private double _totalPrice;
        private int _capacity;
        private Item[] _cart = new Item[5];
        private int i;
        public ShoppingCart()
        {
            i = 0;
            _itemCount = 0;
            _totalPrice = 0.0;
            _capacity = _cart.Length;
        }
        public void AddToCart(string itemName, double price, int quantity)
        {
            if(!IfCartIsNotFull())
            {
                IncreaseSize();
            }
            _totalPrice += price * quantity;

            _cart[_itemCount] = new Item(itemName, price, quantity);
            _itemCount++;
        }
        private void IncreaseSize()
        {
            _capacity += 3;
            Array.Resize(ref _cart, _capacity);
        }
        public bool IfCartIsNotFull()
        {
            if (_capacity - _itemCount > 0)
                return true;
            else
                return false;
        }
        public override string ToString()
        {
            string contents = "\nShopping Cart\n";
            contents += "    Item         Unit Price        Quantity\n";
            for (int i = 0; i < _itemCount; i++)
            {
                contents += _cart[i] + "\n";
            }
            contents += $"\nПожалуйста заплатите: {_totalPrice}\n";
            return contents;
        }
    }
    class Program
    {
        static string EnterStr()
        {
            Console.Write("Введите название предмета: ");
            string str = Console.ReadLine();
            return str;
        }
        static int EnterCount()
        {
            int n;
            do
            {
                Console.WriteLine("Введите количество: ");
            } while (!int.TryParse(Console.ReadLine(), out n));
            return n;
        }
        static int EnterMoney()
        {
            int n;
            do
            {
                Console.WriteLine("Введите число денег: ");
            } while (!int.TryParse(Console.ReadLine(), out n));
            return n;
        }
        static void Main()
        {
            ShoppingCart shop = new ShoppingCart();
            ConsoleKeyInfo key;
            int i = 1;
            do
            {
                Console.WriteLine("Кладу в корзину в " + i + " раз!");
                shop.AddToCart(EnterStr(), EnterMoney(), EnterCount());

                i++;

                Console.WriteLine("\nВведите Esc если больше не будете ничего покупать!");
                key = Console.ReadKey(true);
            } while (key.Key != ConsoleKey.Escape);

            Console.WriteLine(shop);
            Console.ReadLine();
        }
    }
}