Task 31

using System;

namespace C_sharp_Light
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.CursorVisible = false;
            Console.Write("Введите имя игрока: ");
            Person player = new Person(Console.ReadLine());
            TradeRoom tradeRoom = new TradeRoom(player);
            tradeRoom.Work();
        }
    }

    static class RandomStatic
    {
        static private Random _rand = new Random();

        static public int GetNext(int min, int max)
        {
            return _rand.Next(min,max);

        }
        static public int GetNext(int max)
        {
            return _rand.Next(max);
        }
    }

    static class DisplayingMessages
    {
        static public void ShowMessageWithColor(string message, ConsoleColor color, int CursorleftPosition)
        {
            Console.CursorLeft = CursorleftPosition;
            ConsoleColor defaultColor = Console.ForegroundColor;
            Console.ForegroundColor = color;
            Console.WriteLine(message);
            Console.ForegroundColor = defaultColor;
        }

        static public void ShowMessageWithColor(string message, ConsoleColor color, bool delay)
        {
            ConsoleColor defaultColor = Console.ForegroundColor;
            Console.ForegroundColor = color;
            Console.WriteLine(message);
            Console.ForegroundColor = defaultColor;
            if(delay)
                Console.ReadKey();
        }
    }
}

namespace C_sharp_Light
{
    class Item
    {
        private string _name;
        private int _cost;
        public int Cost
        {
            get
            {
                return _cost;
            }
        }
        public string Name
        {
            get
            {
                return _name;
            }
        }
        public Item()
        {
            _name = new string[] { "Железный меч", "Рогатый шлем", "Посох огня", "Кожаный сапоги", "Сладкий рулет" }[RandomStatic.GetNext(0, 5)];
            _cost = RandomStatic.GetNext(20, 150);
        }
        private Item(string name, int baseCost)
        {
            _name = name;
            _cost = baseCost;
        }
        public Item Clone()
        {
            return new Item(Name, Cost);
        }
        public string Info()
        {
            return $"{Name} стоит - {Cost}";
        }
    }
    class Person
    {
        private int _money;
        public string Name { get; private set; }
        public int Money
        {
            get
            {
                return _money;
            }
        }
        private List<Item> _inventory = new List<Item>();
        public int SelectedIndexItem { get; private set; }
        public Person()
        {
            _money = RandomStatic.GetNext(300, 900);
            SelectedIndexItem = 0;
            Name = "Торговец";
            int amountItems = RandomStatic.GetNext(3, 9);
            for (int i = 0; i < amountItems; i++)
            {
                _inventory.Add(new Item());
            }
        }
        public Person(string name)
        {
            _money = RandomStatic.GetNext(300, 900);
            SelectedIndexItem = 0;
            Name = name;
            int amountItems = RandomStatic.GetNext(3, 9);
            for (int i = 0; i < amountItems; i++)
            {
                _inventory.Add(new Item());
            }
        }
        //
        public bool CanBuyIt(Item iten)
        {
            if (Money >= iten.Cost) return true;
            else return false;
        }
        public int GetSizeInventory()
        {
            return _inventory.Count;
        }
        public string GetInfoItemByIndex(int index)
        {
            return _inventory[index].Info();
        }
        public void ChangeActiveItem(int step)
        {
            SelectedIndexItem += step;
            UpdateIndex();
        }
        public Item GiveItem()
        {
            Item temp = _inventory[SelectedIndexItem];
            _inventory.RemoveAt(SelectedIndexItem);
            _money += temp.Cost;
            UpdateIndex();
            return temp.Clone();
        }
        public Item PickItem()
        {
            return _inventory[SelectedIndexItem];
        }
        public void GetItem(Item item)
        {
            _inventory.Add(item);
            _money -= item.Cost;
            UpdateIndex();
        }
        public void DrawnInfo(bool isSelected, int CursorPositionX)
        {
            if (isSelected)
                DisplayingMessages.ShowMessageWithColor($"Инветарь {Name} - выбран", ConsoleColor.Green, CursorPositionX);
            else
                DisplayingMessages.ShowMessageWithColor($"Инветарь {Name} - не выбран", ConsoleColor.Red, CursorPositionX);
            DisplayingMessages.ShowMessageWithColor($"Денег: {Money}", ConsoleColor.Yellow, CursorPositionX);
            for (int i = 0; i < GetSizeInventory(); i++)
            {
                if (i == SelectedIndexItem && isSelected)
                    DisplayingMessages.ShowMessageWithColor($"{i}: {GetInfoItemByIndex(i)}", ConsoleColor.Green, CursorPositionX);
                else
                    DisplayingMessages.ShowMessageWithColor($"{i}: {GetInfoItemByIndex(i)}", ConsoleColor.White, CursorPositionX);
            }
        }
        private void UpdateIndex()
        {
            if (SelectedIndexItem < 0)
                SelectedIndexItem = 0;
            else if (SelectedIndexItem > _inventory.Count - 1)
                SelectedIndexItem = _inventory.Count - 1;
        }
    }
    class TradeRoom
    {
        private Person _player;
        private Person _trader;
        bool playerIsSelected = true;
        public TradeRoom(Person player)
        {
            _player = player;
            CreateNewTrader();
        }
        public void Work()
        {
            bool isOpen = true;
            int xPosMenu = 0, yPosMeny = 22;
            while (isOpen)
            {
                Console.Clear();
                DrawnInfoAboutTraders();
                Console.SetCursorPosition(xPosMenu, yPosMeny);
                Console.WriteLine($"{ConsoleKey.RightArrow} или {ConsoleKey.LeftArrow} - для смены активного лица " +
                    $"\n{ConsoleKey.UpArrow} и {ConsoleKey.DownArrow} - для выбора предмета" +
                    $"\n{ConsoleKey.Enter} - Покупка/продажа" +
                    $"\n{ConsoleKey.Tab} - Получить нового торговца" +
                    $"\n{ConsoleKey.Escape} - Выход");
                ConsoleKeyInfo key = Console.ReadKey();
                switch (key.Key)
                {
                    case ConsoleKey.RightArrow: case ConsoleKey.LeftArrow:
                        ChangeSellingSide();
                        break;
                    case ConsoleKey.UpArrow:
                        ChangeActiveItem(-1);
                        break;
                    case ConsoleKey.DownArrow:
                        ChangeActiveItem(1);
                        break;
                    case ConsoleKey.Tab:
                        CreateNewTrader();
                        break;
                    case ConsoleKey.Enter:
                        BuyOrSell();
                        break;
                    case ConsoleKey.Escape:
                        isOpen = false;
                        break;
                }
            }
        }
        private void BuyOrSell()
        {
            if (ActiveTrader().GetSizeInventory() > 0)
                if (UnactiveTrader().CanBuyIt(ActiveTrader().PickItem()))
                    UnactiveTrader().GetItem(ActiveTrader().GiveItem());
                else
                    DisplayingMessages.ShowMessageWithColor("ОШИБКА: У неактивного участника недостаточно денег для покупки предмета у активного", ConsoleColor.Red, true);
            else
                DisplayingMessages.ShowMessageWithColor("ОШИБКА: У активного участника больше не осталось вещей.", ConsoleColor.Red, true);
        }
        private void DrawnInfoAboutTraders()
        {
            int xPosPlayer = 0;
            int xPosTrader = xPosPlayer + 30;
            _player.DrawnInfo(playerIsSelected, xPosPlayer);
            Console.CursorTop = 0;
            _trader.DrawnInfo(!playerIsSelected, xPosTrader);
        }
        private void ChangeSellingSide()
        {
            playerIsSelected = !playerIsSelected;
        }
        private void CreateNewTrader()
        {
            _trader = new Person();
        }
        private void ChangeActiveItem(int step)
        {
            ActiveTrader().ChangeActiveItem(step);
        }
        private Person ActiveTrader()
        {
            if (playerIsSelected)
                return _player;
            else
                return _trader;
        }
        private Person UnactiveTrader()
        {
            if (playerIsSelected)
                return _trader;
            else
                return _player;
        }
    }
}