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using System;

namespace ProxyPattern1
{
class Program
{
static void Main(string[] args)
{
string username = "", password = "";
double total = 0;
bool loginResult = false;

do
{
if (!loginResult)
{
Console.WriteLine("Lütfen kullanıcı adınızı giriniz : ");
username = Console.ReadLine();

Console.WriteLine("Lütfen şifrenizi giriniz : ");
password = Console.ReadLine();
}


Console.WriteLine("Lütfen ödenecek olan tutarı giriniz : ");
total = Convert.ToDouble(Console.ReadLine());

IBanka banka = new ProxyBanka(username, password);

bool result = banka.OdemeYap(total);
loginResult = banka.LoginStatus;


Console.WriteLine("*****************************");

if (result)
{
break;
}

} while (true);

Console.ReadKey();
}
}

public interface IBanka
{
bool OdemeYap(double tutar);
bool LoginStatus { get; set; }
}

// Real subject class
public class Banka : IBanka
{
public bool LoginStatus { get; set; }
public bool OdemeYap(double tutar)
{
if (tutar < 100)
{
Console.WriteLine($"Ödeyeceğiniz tutar 100 tl'den az olamaz => {100 - tutar}");
}
else if (tutar > 100)
{
Console.WriteLine($"Ödeyeceğiniz tutar 100 tl'den fazla olamaz => {tutar - 100}");
}
else
{
Console.WriteLine($"Ödeme başarıyla gerçekleştirildi => {tutar}");
return true;
}
return false;
}
}


public class ProxyBanka : IBanka
{
Banka _banka;
bool _login;
string _userName, _password;

public bool LoginStatus { get => _login; set { } } // kullanıcı dışarıdan değer set edemez.

public ProxyBanka(string username, string password)
{
this._userName = username;
this._password = password;
}

bool Login()
{
if (_userName.Equals("bilgeadam") && _password.Equals("123456"))
{
_banka = new Banka();
_login = true;
_banka.LoginStatus = _login;
Console.WriteLine("Hesaba giriş yapıldı!");
}
else
{
Console.WriteLine("Lütfen kullanıcı bilgilerinizi düzgün girin!");
_login = false;
}

return _login;
}



public bool OdemeYap(double tutar)
{
bool result = Login();

if (!result)
{
Console.WriteLine("Hesaba giriş yapılmadığından dolayı, işleme devam edemiyoruz. Hacı");
return false;
}

return _banka.OdemeYap(tutar);
}
}
}
     
 
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