نمط Strategy

// Strategy interface
class PaymentStrategy {
  pay(amount) {
    throw new Error('يجب تنفيذ هذه الدالة');
  }
}

// Concrete Strategies
class CreditCardPayment extends PaymentStrategy {
  pay(amount) {
    console.log(`دفع ${amount} عن طريق بطاقة ائتمان`);
  }
}

class PayPalPayment extends PaymentStrategy {
  pay(amount) {
    console.log(`دفع ${amount} عن طريق PayPal`);
  }
}

class WalletPayment extends PaymentStrategy {
  pay(amount) {
    console.log(`دفع ${amount} عن طريق المحفظة الرقمية`);
  }
}

// Context — المستخدم
class ShoppingCart {
  constructor(strategy) {
    this.strategy = strategy;
  }

  setPaymentStrategy(strategy) {
    this.strategy = strategy;
  }

  checkout(amount) {
    this.strategy.pay(amount);
  }
}

// الاستخدام
const cart = new ShoppingCart(new CreditCardPayment());
cart.checkout(100); // دفع 100 عن طريق بطاقة ائتمان

cart.setPaymentStrategy(new PayPalPayment());
cart.checkout(200); // دفع 200 عن طريق PayPal

from abc import ABC, abstractmethod

class Strategy(ABC):
    @abstractmethod
    def pay(self, amount):
        pass

class CreditCard(Strategy):
    def pay(self, amount):
        print(f"دفع {amount} ببطاقة ائتمان")

class PayPal(Strategy):
    def pay(self, amount):
        print(f"دفع {amount} عبر PayPal")

class Cart:
    def __init__(self, strategy: Strategy):
        self._strategy = strategy

    def checkout(self, amount):
        self._strategy.pay(amount)

cart = Cart(CreditCard())
cart.checkout(50)  # دفع 50 ببطاقة ائتمان