namespace ConsoleApp1;

using System.Text;

public class Task12_02
{
    private const string RubName = "Rub";
    private const string UsdName = "Usd";
    private const string EurName = "Eur";

    private const float UsdToRub = 70f;
    private const float RubToUsd = 1f / 67f;
    private const float EurToRub = 80f;
    private const float RubToEur = 1f / 77f;
    private const float UsdToEur = 0.9f;
    private const float EurToUsd = 1.1f;

    public void Run()
    {
        Console.InputEncoding = Encoding.Unicode;
        Console.OutputEncoding = Encoding.Unicode;

        string[] currencies = new[] { RubName, UsdName, EurName };

        string currentCurrency = InputCurrency();

        Console.Write("Input currency start value: ");
        float currentCurrencyValue = float.Parse( Console.ReadLine() );

        var currencyWallets = new Dictionary<string, float>();
        var currencyRates = new Dictionary<(string, string), float>()
        {
            { (RubName, UsdName), RubToUsd },
            { (UsdName, RubName), UsdToRub },
            { (RubName, EurName), RubToEur },
            { (EurName, RubName), EurToRub },
            { (EurName, UsdName), EurToUsd },
            { (UsdName, EurName), UsdToEur },
        };

        foreach ( var currency in currencies )
        {
            float currencyValue = string.Equals( currentCurrency, currency ) ? currentCurrencyValue : 0;
            currencyWallets[currency] = currencyValue;
        }

        bool canExit = false;

        while ( canExit == false )
        {
            Console.Clear();
            WriteWalletsInfo( currencyWallets );

            Console.WriteLine( "Select source currency" );
            string sourceCurrency = InputCurrency();

            Console.WriteLine( "Select target currency" );
            string targetCurrency = InputCurrency();

            Console.WriteLine( $"Enter value in {sourceCurrency}" );
            float sourceCurrencyValue = float.Parse( Console.ReadLine() );

            ConvertCurrency( currencyWallets, currencyRates, sourceCurrency, targetCurrency, sourceCurrencyValue );

            WriteWalletsInfo( currencyWallets );

            string properlyExitAnswer = "n";
            Console.WriteLine( $"\nContinue? Enter {properlyExitAnswer} for exit" );
            string continueAnswer = Console.ReadLine();

            canExit = string.Equals( continueAnswer, properlyExitAnswer );
        }
    }

    private string InputCurrency()
    {
        string currentCurrency;
        bool isCurrencyValid;

        do
        {
            Console.WriteLine( $"Input currency ( {RubName}, {UsdName}, {EurName} ): " );
            currentCurrency = Console.ReadLine();
            isCurrencyValid = IsCurrencyValid( currentCurrency );

            if ( isCurrencyValid == false )
                Console.WriteLine( $"Currency {currentCurrency} is not valid. Try again." );
        }
        while ( isCurrencyValid == false );

        return currentCurrency;
    }

    private bool IsCurrencyValid( string currency )
    {
        return string.Equals( currency, RubName ) || string.Equals( currency, UsdName ) || string.Equals( currency, EurName );
    }


    private void WriteWalletsInfo( Dictionary<string, float> currencyWallets )
    {
        Console.WriteLine( "=== Wallets Info ===" );

        foreach ( var currencyKey in currencyWallets.Keys )
            Console.WriteLine( $"[{currencyKey}] : {currencyWallets[currencyKey]}" );
    }

    private void ConvertCurrency( Dictionary<string, float> currencyWallets, Dictionary<(string, string), float> currencyRates,
                                  string sourceCurrency, string targetCurrency, float sourceCurrencyValue )
    {
        if ( string.Equals( sourceCurrency, targetCurrency ) )
            return;

        Console.WriteLine( $"Start convertation: {sourceCurrencyValue} from {sourceCurrency} to {targetCurrency}" );

        if ( sourceCurrencyValue > currencyWallets[sourceCurrency] )
        {
            Console.WriteLine( $"Not enough moneys in wallet [{sourceCurrency}]" );
            return;
        }

        Console.WriteLine( $"Convertation is successfully!" );

        currencyWallets[sourceCurrency] -= sourceCurrencyValue;
        currencyWallets[targetCurrency] += sourceCurrencyValue * currencyRates[(sourceCurrency, targetCurrency)];
    }
}