43. Task: Shop

43. Task: Shop

public class Program
{
    static void Main()
    {
        Shop shop = new Shop();
        shop.Open();
    }
}

class Product
{    
    public Product(string name, int price)
    {
        Name = name;
        Price = price;
    }
    
    public string Name { get; private set; }
    public int Price { get; private set; }
}

class Cell
{
    public Cell(Product product, int amount)
    {
        Product = product;
        Amount = amount;
    }
    
    public Product Product { get; private set; }
    public int Amount { get; private set; }

    public void IncreaseAmountProduct(int amount)
    {
        Amount += amount;
    }

    public void DecreaseAmountProduct(int amount)
    {
        Amount -= amount;
    }
}

class Human
{
    public Human(int money)
    {
        Money = money;
    }

    protected List<Cell> Cells = new List<Cell>();
    public int Money { get; protected set; }

    public void ShowMoney()
    {
        Console.WriteLine($"Money {this} = {Money}");
    }

    public void ShowProducts()
    {
        int borderLength = 45;
        char borderSymbol = '-';

        if (Cells.Count > 0)
        {
            Console.WriteLine("\n[Product] \t [Price] \t [Amount] ");

            foreach (var cell in Cells)
            {
                Console.WriteLine($" {cell.Product.Name}\t\t  {cell.Product.Price}\t\t  {cell.Amount}");
            }
        }
        else
        {
            Console.WriteLine("\nList empty.");
        }

        Console.WriteLine(new string(borderSymbol, borderLength));
    }
}

class Seller : Human
{
    public Seller(int money) : base(money)
    {
        FillCells();
    }

    public bool TryGetCellProduct(string name, out Cell cell)
    {
        cell = null;

        for (int i = 0; i < Cells.Count; i++)
        {
            if (Cells[i].Product.Name.ToLower().Contains(name.ToLower()))
            {
                cell = Cells[i];
                return true;
            }
        }

        return false;
    }

    public int GetPricePerAmount(string name, int amount)
    {
        foreach (var cell in Cells)
        {
            if (cell.Product.Name == name && cell.Amount >= amount)
            {
                return cell.Product.Price * amount;
            }
        }

        return 0;
    }

    public void Sell(Cell cell, int amount, int money)
    {
        DecreaseAmountProduct(cell.Product.Name, amount);
        IncreaseMoney(money);
    }

    private void FillCells()
    {
        Cells.Add(new Cell(new Product(name: "Bread", price: 100), amount: 15));
        Cells.Add(new Cell(new Product(name: "Cheese", price: 250), amount: 13));
        Cells.Add(new Cell(new Product(name: "Eggs", price: 90), amount: 11));
        Cells.Add(new Cell(new Product(name: "Milk", price: 80), amount: 21));
        Cells.Add(new Cell(new Product(name: "Meat", price: 330), amount: 17));
    }

    private void DecreaseAmountProduct(string name, int amount)
    {
        foreach (var cell in Cells)
        {
            if (cell.Product.Name == name && cell.Amount >= amount)
            {
                cell.DecreaseAmountProduct(amount);
                return;
            }
        }
    }

    private void IncreaseMoney(int money)
    {
        Money += money;
    }
}

class Buyer : Human
{
    public Buyer(int money) : base(money) { }

    public void Buy(Cell cell, int amount, int money)
    {
        IncreaseAmountProduct(cell, amount);
        DecreaseMoney(money);
    }

    public bool CanPay(int pricePerAmount)
    {
        return Money >= pricePerAmount;
    }

    private void IncreaseAmountProduct(Cell cell, int amount)
    {
        foreach (var cellBuyer in Cells)
        {
            if (cellBuyer.Product.Name == cell.Product.Name)
            {
                cellBuyer.IncreaseAmountProduct(amount);
                return;
            }
        }

        Cells.Add(new Cell(new Product(cell.Product.Name, cell.Product.Price), amount));
    }

    private void DecreaseMoney(int money)
    {
        Money -= money;
    }
}

class Shop
{
    public void Open()
    {
        const string TradeProductCommand = "1";
        const string ExitCommand = "2";

        bool isOpen = true;
        int moneySeller = 0;
        int moneyBuyer = 9000;

        Seller seller = new Seller(moneySeller);
        Buyer buyer = new Buyer(moneyBuyer);

        while (isOpen)
        {
            Console.Clear();

            seller.ShowMoney();
            seller.ShowProducts();

            buyer.ShowMoney();
            buyer.ShowProducts();

            Console.WriteLine(
            $"\nMenu: \n" +
            $" {TradeProductCommand} - Trade Product\n" +
            $" {ExitCommand} - Exit\n");

            Console.Write("Enter command: ");
            string userInput = Console.ReadLine();

            switch (userInput)
            {
                case TradeProductCommand:
                    Trading(seller, buyer);
                    break;

                case ExitCommand:
                    isOpen = false;
                    break;
            }
        }
    }

    private void Trading(Seller seller, Buyer buyer)
    {
        Console.Write("\nEnter product name: ");

        if (seller.TryGetCellProduct(Console.ReadLine().Replace(" ", ""), out Cell cell))
        {
            Console.Write("Enter product amount: ");
            if (int.TryParse(Console.ReadLine(), out int amount))
            {
                int pricePerAmount = seller.GetPricePerAmount(cell.Product.Name, amount);

                if (pricePerAmount > 0)
                {
                    if (buyer.CanPay(pricePerAmount))
                    {
                        seller.Sell(cell, amount, pricePerAmount);
                        buyer.Buy(cell, amount, pricePerAmount);
                    }
                }
            }
        }
    }
}