freeCodeCamp · jdwilkin4 · Jul 13, 2025 · Apr 29, 2025 · Apr 30, 2025 · May 7, 2025
diff --git a/fullstack-cert/python-projects/abstraction-workshop/main.py b/fullstack-cert/python-projects/abstraction-workshop/main.py
@@ -0,0 +1,72 @@
+from abc import ABC, abstractmethod
+from typing import List
+
+class Product:
+    def __init__(self, name: str, price: float):
+        self.name = name
+        self.price = price
+
+class DiscountStrategy(ABC):
+    @abstractmethod
+    def is_applicable(self, product: Product, user_tier: str) -> bool:
+        pass
+    @abstractmethod
+    def apply_discount(self, product: Product) -> float:
+        pass
+
+class PercentageDiscount(DiscountStrategy):
+    def __init__(self, percent: float):
+        self.percent = percent
+
+    def is_applicable(self, product: Product, user_tier: str) -> bool:
+        return self.percent <= 70
+
+    def apply_discount(self, product: Product) -> float:
+        return product.price * (1 - self.percent / 100)
+
+class FixedAmountDiscount(DiscountStrategy):
+    def __init__(self, amount: float):
+        self.amount = amount
+
+    def is_applicable(self, product: Product, user_tier: str) -> bool:
+        return product.price*0.9 > self.amount
+
+    def apply_discount(self, product: Product) -> float:
+        return product.price - self.amount
+
+class PremiumUserDiscount(DiscountStrategy):
+    def is_applicable(self, product: Product, user_tier: str) -> bool:
+        return user_tier.lower() == 'premium'
+
+    def apply_discount(self, product: Product) -> float:
+        return product.price * 0.80  # 20% off for premium users
+
+class DiscountEngine:
+    def __init__(self, strategies: List[DiscountStrategy]):
+        self.strategies = strategies
+
+    def calculate_best_price(self, product: Product, user_tier: str) -> float:
+        prices = [product.price]
+
+        for strategy in self.strategies:
+            if strategy.is_applicable(product, user_tier):
+                discounted = strategy.apply_discount(product)
+                prices.append(discounted)
+
+        return min(prices)
+
+
+if __name__ == "__main__":
+    product = Product("Wireless Mouse", 50.0)
+    user_tier = "Premium"
+
+    strategies = [
+        PercentageDiscount(10),
+        FixedAmountDiscount(5),
+        PremiumUserDiscount()
+    ]
+
+    engine = DiscountEngine(strategies)
+    best_price = engine.calculate_best_price(product, user_tier)
+
+    print(f"Best price for {product.name} for {user_tier} user: ${best_price:.2f}")