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

namespace CJunior
{
    class Program
    {
        static void Main(string[] args)
        {
            float rubToUsd = 0.12f;
            float rubToEur = 0.11f;

            float eurToRub = 83.49f;
            float eurToUsd = 1.09f;

            float usdToRub = 76.98f;
            float usdToEur = 0.92f;

            float rublesCount = 1000f;
            float dollarsCount = 1000f;
            float euroCount = 1000f;

            string rublesName = "рубли";
            string dollarsName = "доллары";
            string euroName = "евро";

            int rublesMenuNumber = 1;
            int dollarsMenuNumber = 2;
            int euroMenuNumber = 3;

            string currentCommand = "";
            string changeCurrencyCommand = "1";
            string exitCommand = "2";

            while (currentCommand != exitCommand)
            {
                Console.Clear();
                Console.WriteLine("Вас приветствует конвертер валют!");
                Console.WriteLine($"У ваc на счету:\t{rublesCount} рублей\t{dollarsCount} долларов\t{euroCount} евро");
                Console.WriteLine("Вы можете совершить следующие действия:");
                Console.WriteLine("1. Обменять валюту");
                Console.WriteLine("2. Выйти");
                Console.Write("Введите номер команды: ");
                currentCommand = Console.ReadLine();
                while (currentCommand != changeCurrencyCommand && currentCommand != exitCommand)
                {
                    Console.WriteLine("Некорректный номер");
                    Console.Write("Введите номер команды: ");
                    currentCommand = Console.ReadLine();
                }

                if (currentCommand == changeCurrencyCommand)
                {
                    Console.Clear();
                    Console.WriteLine($"У ваc на счету: {rublesCount} рублей\t{dollarsCount} долларов\t{euroCount} евро");
                    Console.WriteLine($"{rublesMenuNumber}. Рубли");
                    Console.WriteLine($"{dollarsMenuNumber}. Доллары");
                    Console.WriteLine($"{euroMenuNumber}. Евро");
                    Console.Write("Выберите номер валюты которую хотите обменять: ");
                    int currencyToChangeNumber;
                    while (int.TryParse(Console.ReadLine(), out currencyToChangeNumber) == false || (currencyToChangeNumber != rublesMenuNumber && currencyToChangeNumber != dollarsMenuNumber && currencyToChangeNumber != euroMenuNumber))
                    {
                        Console.WriteLine("Неверный номер");
                        Console.Write("Выберите номер валюты которую хотите обменять: ");
                    }

                    Console.Clear();
                    Console.WriteLine($"У ваc на счету: {rublesCount} рублей\t{dollarsCount} долларов\t{euroCount} евро");
                    Console.WriteLine("1. Рубли");
                    Console.WriteLine("2. Доллары");
                    Console.WriteLine("3. Евро");
                    Console.Write("Выберите номер валюты на которую хотите обменять: ");
                    int newChangedCurrencyNumber;
                    while (int.TryParse(Console.ReadLine(), out newChangedCurrencyNumber) == false || (newChangedCurrencyNumber != rublesMenuNumber && newChangedCurrencyNumber != dollarsMenuNumber && newChangedCurrencyNumber != euroMenuNumber) || newChangedCurrencyNumber == currencyToChangeNumber)
                    {
                        if (newChangedCurrencyNumber == currencyToChangeNumber)
                            Console.WriteLine("Вы и так обмениваете эту валюту, выберите другую");
                        else
                            Console.WriteLine("Неверный номер");
                        Console.Write("Выберите номер валюты на которую хотите обменять: ");
                    }

                    string currencyToChangeName;
                    if (currencyToChangeNumber == rublesMenuNumber)
                        currencyToChangeName = rublesName;
                    else if (currencyToChangeNumber == dollarsMenuNumber)
                        currencyToChangeName = dollarsName;
                    else
                        currencyToChangeName = euroName;
                    string newChangedCurrencyName;
                    if (newChangedCurrencyNumber == rublesMenuNumber)
                        newChangedCurrencyName = rublesName;
                    else if (newChangedCurrencyNumber == dollarsMenuNumber)
                        newChangedCurrencyName = dollarsName;
                    else
                        newChangedCurrencyName = euroName;

                    bool currencyConverted = false;
                    while (currencyConverted == false)
                    {
                        Console.Clear();
                        Console.WriteLine($"У ваc на счету: {rublesCount} рублей\t{dollarsCount} долларов\t{euroCount} евро");
                        Console.WriteLine($"Вы меняете {currencyToChangeName} на {newChangedCurrencyName}.");
                        Console.Write($"Введите кол-во валюты ({currencyToChangeName}) для обмена: ");
                        float currencyToChangeValue = float.Parse(Console.ReadLine());

                        bool currencyToChangeEnough = false;
                        if (currencyToChangeNumber == rublesMenuNumber)
                            currencyToChangeEnough = currencyToChangeValue <= rublesCount;
                        else if (currencyToChangeNumber == dollarsMenuNumber)
                            currencyToChangeEnough = currencyToChangeValue <= dollarsCount;
                        else
                            currencyToChangeEnough = currencyToChangeValue <= euroCount;

                        if (currencyToChangeEnough)
                        {
                            if (currencyToChangeNumber == rublesMenuNumber)
                            {
                                rublesCount -= currencyToChangeValue;
                                if (newChangedCurrencyNumber == dollarsMenuNumber)
                                    dollarsCount += currencyToChangeValue * rubToUsd;
                                else
                                    euroCount += currencyToChangeValue * rubToEur;
                            }
                            else if (currencyToChangeNumber == dollarsMenuNumber)
                            {
                                dollarsCount -= currencyToChangeValue;
                                if (newChangedCurrencyNumber == rublesMenuNumber)
                                    rublesCount += currencyToChangeValue * usdToRub;
                                else
                                    euroCount += currencyToChangeValue * usdToEur;
                            }
                            else
                            {
                                euroCount -= currencyToChangeValue;
                                if (newChangedCurrencyNumber == rublesMenuNumber)
                                    rublesCount += currencyToChangeValue * eurToRub;
                                else
                                    dollarsCount += currencyToChangeValue * eurToUsd;
                            }
                            currencyConverted = true;
                        }
                        else
                        {
                            Console.WriteLine("Некорреткное значение.");
                        }
                    }
                }
            }
        }
    }
}