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

namespace HW_5_4
{
    class Program
    {
        static void Main(string[] args)
        {
            Product skirt = new Product("Юбка", 10, 2);
            Product belt = new Product("Ремень", 15.5, 3);
            Product socks = new Product("Носки", 1.4, 10);
            Product armani = new Product("Сережки", 95, 10);

            Product[] stock = { skirt, belt, socks, armani };

            Seller seller = new Seller(stock);
            Buyer buyer = new Buyer(100);

            Console.WriteLine("Добро пожаловать в магазин.\n" +
                              "Выберите дальнейшее действие\n" +
                              "1. Просмотреть весь ассортимент\n" +
                              "2. Купить товар\n" +
                              "3. Просмотреть свои вещи и баланс\n" +
                              "4. Выход");
            while (true)
            {
                string userInput = Console.ReadLine();
                switch (userInput)
                {
                    case "1":
                        seller.WriteAllProducts();
                        break;

                    case "2":
                        seller.WriteAllProducts();
                        Console.Write("Какой товар хотите купить? Введите название: ");
                        string desiredName = Console.ReadLine();
                        Console.Write("Сколько?");
                        int desiredAmount = Convert.ToInt32(Console.ReadLine());
                        if (buyer.Balance >= seller.GetPurchasePrice(desiredName, desiredAmount))
                        {
                            if (seller.isEnough(desiredName, desiredAmount))
                            {
                                buyer.Purchase(seller.Sell(desiredName, desiredAmount));
                                seller.DeleteItem(desiredName, desiredAmount);
                            }
                            else
                            {
                                Console.WriteLine("Извините, недостаточно товара на складе.");
                            }
                        }
                        else
                        {
                            Console.WriteLine("Извините, у вас недостаточно средств.");
                        }
                        break;

                    case "3":
                        buyer.WriteAllProperty();
                        break;

                    case "4":
                        Environment.Exit(0);
                        break;
                }
            }
        }
    }


    class Owner
    {
        protected Product[] _products { get; set; }

        public Owner(Product[] products)
        {
            _products = products;
        }

        public Owner()
        {
            _products = new Product[0];
        }

        public void AddItem(Product product)
        {
            bool alreadyExist = false;

            for (int i = 0; i < _products.Length; i++)
            {
                if (product.Name == _products[i].Name)
                {
                    _products[i].increaseAmount(product.Amount);
                    alreadyExist = true;
                }
            }

            if (!alreadyExist)
            {
                Product[] tempList = new Product[_products.Length];

                for (int j = 0; j < _products.Length; j++)
                {
                    tempList[j] = _products[j];
                }

                _products = new Product[_products.Length + 1];

                for (int i = 0; i < _products.Length - 1; i++)
                {
                    _products[i] = tempList[i];
                }

                _products[_products.Length - 1] = product;
            }
        }

        public void DeleteItem(String name, int amount)
        {
            for (int i = 0; i < _products.Length; i++)
            {
                if (name == _products[i].Name)
                {
                    _products[i].decreaseAmount(amount);
                }
            }
        }
    }

    class Seller : Owner
    {
        public Seller(Product[] products) : base(products)
        {
        }
        public void WriteAllProducts()
        {
            Console.WriteLine("В магазине в наличии:");
            for (int i = 0; i < _products.Length; i++)
            {
                if (_products[i].Amount != 0)
                {
                    Console.WriteLine($"{_products[i].Name}  {_products[i].Price}  руб.  {_products[i].Amount} шт.");
                }
            }
        }

        public Product Sell(string name, int amount)
        {
            string newName = "";
            double price = 0;

            for (int i = 0; i < _products.Length; i++)
            {
                if (name == _products[i].Name)
                {
                    newName = _products[i].Name;
                    price = _products[i].Price;
                }
            }

            Product sell = new Product(newName, price, amount);

            return sell;
        }

        public double GetPurchasePrice(string name, int amount)
        {
            double purchasePrice = 0;

            for (int i = 0; i < _products.Length; i++)
            {
                if (name == _products[i].Name)
                {
                    purchasePrice = _products[i].Price * amount;
                }
            }

            return purchasePrice;
        }

        public bool isEnough(string name, int amount)
        {
            bool isEnough = false;

            for (int i = 0; i < _products.Length; i++)
            {
                if (name == _products[i].Name)
                {
                    if (_products[i].Amount >= amount)
                    {
                        isEnough = true;
                    }
                }
            }
            return isEnough;
        }
    }

    class Buyer : Owner
    {

        private double _balance;
        public double Balance
        {
            get
            {
                return _balance;
            }
            set
            {
                if (value >= 0)
                {
                    _balance = value;
                }
            }
        }


        public Buyer(double balance)
        {
            _balance = balance;
            _products = new Product[0];
        }

        public void Purchase(Product product)
        {
            AddItem(product);
            _balance -= product.Price;
        }

        public void WriteAllProperty()
        {
            Console.WriteLine("У вас есть: ");

            for (int i = 0; i < _products.Length; i++)
            {
                Console.WriteLine($"{_products[i].Name}  {_products[i].Amount} шт.");
            }

            Console.WriteLine($"Ваш баланс {_balance} руб.");
        }
    }


    class Product
    {
        public string Name { get; private set; }
        public double Price { get; set; }

        private int _amount;

        public int Amount
        {
            get
            {
                return _amount;
            }
            private set
            {
                if (value >= 0)
                {
                    _amount = value;
                }
            }
        }

        public Product(string name, double price, int amount)
        {
            Name = name;
            Price = price;
            _amount = amount;
        }

        public void increaseAmount(int addAmount)
        {
            _amount += addAmount;
        }

        public void decreaseAmount(int deductAmount)
        {
            _amount -= deductAmount;
        }
    }
}