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+package store.controller;
+
+import static store.common.constant.PromotionNotice.GET_FREE_M_NOTICE;
+import static store.common.constant.PromotionNotice.OUT_OF_STOCK_NOTICE;
+
+import java.util.List;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.stream.Collectors;
+import store.common.dto.PromotionConditionResult;
+import store.common.dto.PromotionResult;
+import store.common.dto.PurchaseRequest;
+import store.common.dto.PurchaseRequest.PurchaseProductNames;
+import store.model.Cart;
+import store.model.Product;
+import store.model.ProductCatalog;
+import store.model.Products;
+import store.model.PromotionCatalog;
+import store.model.Receipt;
+import store.view.OutputView;
+
+public class StoreController {
+
+    private final InputHandler inputHandler;
+    private final OutputView outputView;
+
+    private final ProductCatalog productCatalog;
+    private final PromotionCatalog promotionCatalog;
+
+    public StoreController(InputHandler inputHandler, OutputView outputView) {
+        this.inputHandler = inputHandler;
+        this.outputView = outputView;
+        promotionCatalog = inputHandler.getPromotions();
+        productCatalog = inputHandler.getProducts(promotionCatalog);
+    }
+
+    public void run() {
+        PurchaseRequest purchaseItems = getPurchaseRequest();
+        Cart cart = Cart.empty();
+
+        Products promotionalProducts = getPromotionalProducts(purchaseItems.getProductNames());
+        List<PromotionResult> promotionResults = addPromotionalProductToCart(promotionalProducts, purchaseItems, cart);
+        addRegularProductToCart(purchaseItems, cart);
+        int membershipDiscount = applyMembership(cart, promotionalProducts);
+        purchaseProducts(cart);
+        printReceipt(cart, promotionResults, membershipDiscount);
+        repurchaseIfWant();
+    }
+
+    private PurchaseRequest getPurchaseRequest() {
+        outputView.printStoreInventory(productCatalog);
+        return inputHandler.getPurchaseItems(productCatalog);
+    }
+
+    private void addRegularProductToCart(PurchaseRequest purchaseItems, Cart cart) {
+        purchaseItems.items().keySet().forEach(productName -> {
+            Product product = productCatalog.getProductByName(productName).products().stream()
+                    .findFirst()
+                    .orElseThrow(IllegalArgumentException::new);
+            cart.addProduct(product, purchaseItems.items().get(productName));
+        });
+    }
+
+    private List<PromotionResult> addPromotionalProductToCart(
+            Products promotionalProducts, PurchaseRequest purchaseItems, Cart cart
+    ) {
+        promotionalProducts.products().forEach(product -> {
+            int purchaseQuantity = purchaseItems.items().get(product.name());
+            PromotionConditionResult conditionResult = product.checkPromotionCondition(purchaseQuantity);
+            handlePromotionCondition(purchaseItems, cart, product, conditionResult);
+        });
+        return applyPromotion(cart);
+    }
+
+    private Products getPromotionalProducts(PurchaseProductNames productNames) {
+        return Products.from(
+                productCatalog.getProductsByNames(productNames.productNames()).products().stream()
+                        .filter(Product::isPromotionApplicable)
+                        .collect(Collectors.toSet())
+        );
+    }
+
+    private List<PromotionResult> applyPromotion(Cart cart) {
+        return cart.cart().keySet().stream()
+                .filter(Product::isPromotionApplicable)
+                .map(product -> product.applyPromotion(cart.cart().get(product)))
+                .toList();
+    }
+
+    private void handlePromotionCondition(
+            PurchaseRequest purchaseItems, Cart cart, Product product, PromotionConditionResult conditionResult
+    ) {
+        if (GET_FREE_M_NOTICE.matches(conditionResult.message())) {
+            handleGetFreeCondition(purchaseItems, cart, product, conditionResult);
+            return;
+        }
+        if (OUT_OF_STOCK_NOTICE.matches(conditionResult.message())) {
+            handleOutOfPromotionStock(purchaseItems, cart, product, conditionResult);
+            return;
+        }
+        cart.addProduct(product, conditionResult.stockUsed());
+        purchaseItems.items()
+                .replace(product.name(), purchaseItems.items().get(product.name()) - conditionResult.stockUsed());
+    }
+
+    private void handleOutOfPromotionStock(
+            PurchaseRequest purchaseItems, Cart cart, Product product, PromotionConditionResult conditionResult
+    ) {
+        int purchaseQuantity = purchaseItems.items().get(product.name());
+        outputView.printPromotionOutOfStockNotice(conditionResult.message());
+        cart.addProduct(product, conditionResult.stockUsed());
+        if (inputHandler.isAffirmative()) {
+            purchaseItems.items().replace(product.name(), purchaseQuantity - conditionResult.stockUsed());
+            return;
+        }
+        purchaseItems.items().remove(product.name());
+    }
+
+    private void handleGetFreeCondition(
+            PurchaseRequest purchaseItems, Cart cart, Product product, PromotionConditionResult conditionResult
+    ) {
+        int purchaseQuantity = purchaseItems.items().get(product.name());
+        outputView.printGetFreeNotice(conditionResult.message());
+        if (inputHandler.isAffirmative()) {
+            cart.addProduct(product, purchaseQuantity + 1);
+            purchaseItems.items().remove(product.name());
+            return;
+        }
+        cart.addProduct(product, purchaseQuantity);
+        purchaseItems.items().remove(product.name());
+    }
+
+    private int applyMembership(Cart cart, Products promotionalProducts) {
+        outputView.printMembershipNotice();
+        AtomicInteger discountAmount = new AtomicInteger();
+        if (inputHandler.isAffirmative()) {
+            cart.cart().forEach((product, quantity) -> {
+                if (promotionalProducts.products().contains(product)) {
+                    return;
+                }
+                discountAmount.addAndGet(product.price() * quantity);
+            });
+        }
+        discountAmount.updateAndGet(value -> Math.min(value * 30 / 100, 8000));
+        return discountAmount.get();
+    }
+
+    private static void purchaseProducts(Cart cart) {
+        cart.cart().forEach(Product::reduceStock);
+    }
+
+    private void printReceipt(Cart cart, List<PromotionResult> promotionResults, int membershipDiscount) {
+        Receipt receipt = Receipt.of(cart, promotionResults, membershipDiscount);
+        outputView.printReceipt(receipt);
+    }
+
+    private void repurchaseIfWant() {
+        outputView.printRepurchaseNotice();
+        if (inputHandler.isAffirmative()) {
+            run();
+        }
+    }
+}

리뷰: 이 부분은 개인적으로 궁금한 부분인데 인자값을 이렇게 쓰시는데 이유가 있으신걸까요? 🤔