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+package store.controller;
+
+import camp.nextstep.edu.missionutils.DateTimes;
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import store.domain.PaymentProductList;
+import store.domain.Product;
+import store.domain.Products;
+import store.domain.Promotions;
+import store.domain.PromotionsList;
+import store.domain.PurchaseProduct;
+import store.global.util.ProductParser;
+import store.global.util.PromotionParser;
+import store.global.util.PurchaseParser;
+import store.view.InputView;
+import store.view.OutputView;
+
+public class StoreController {
+    private final OutputView outputView;
+    private final InputView inputView;
+
+    public StoreController(OutputView outputView, InputView inputView) {
+        this.outputView = outputView;
+        this.inputView = inputView;
+    }
+
+    public void run() {
+        Products products = loadStoreFiles();
+
+        do {
+            displayWelcome(products);
+            List<PurchaseProduct> purchases = handlePurchases(products);
+            PaymentProductList paymentProductList = processPurchases(purchases);
+
+            displayPaymentInfo(paymentProductList);
+        } while (readAdditionalPurchaseConfirmationWithRetry());
+    }
+
+    private void displayWelcome(Products products) {
+        displayWelcomeMessage();
+        displayProductsInfo(products);
+    }
+
+    private Products loadStoreFiles() {
+        PromotionsList promotionsList = loadPromotions();
+        return loadProducts(promotionsList);
+    }
+
+    private PaymentProductList processPurchases(List<PurchaseProduct> purchases) {
+        PaymentProductList paymentProductList = new PaymentProductList();
+        LocalDateTime now = DateTimes.now();
+
+        for (PurchaseProduct purchase : purchases) {
+            processSinglePurchase(paymentProductList, purchase, now);
+        }
+
+        decreaseProductStock(purchases, paymentProductList);
+        applyMembershipDiscountIfConfirmed(paymentProductList);
+        return paymentProductList;
+    }
+
+    private void decreaseProductStock(List<PurchaseProduct> purchases, PaymentProductList paymentProductList) {
+        List<Integer> quantities = paymentProductList.getAllProductQuantities();
+        for (int i = 0; i < purchases.size(); i++) {
+            purchases.get(i).reduceProductStock(quantities.get(i));
+        }
+    }
+
+    private void processSinglePurchase(PaymentProductList paymentProductList, PurchaseProduct purchase,
+                                       LocalDateTime now) {
+        if (purchase.hasPromotionProduct() && purchase.isWithinPromotionPeriod(now)) {
+            handlePromotionProduct(paymentProductList, purchase);
+            return;
+        }
+        paymentProductList.addPaymentProduct(purchase.createPaymentProduct(0));
+    }
+
+
+    private void handlePromotionProduct(PaymentProductList paymentProductList, PurchaseProduct purchase) {
+        int remainingStock = purchase.getRemainingStock();
+        if (remainingStock > 0) {
+            handleRemainingStock(paymentProductList, purchase, remainingStock);
+            return;
+        }
+        if (remainingStock < 0 && purchase.isPromotionAdditionalProduct()) {
+            handleNonZeroRemainingStock(paymentProductList, purchase);
+            return;
+        }
+        int promotionUnits = purchase.getPromotionUnits();
+        paymentProductList.addPaymentProduct(purchase.createPaymentProduct(promotionUnits));
+    }
+
+    private void handleRemainingStock(PaymentProductList paymentProductList, PurchaseProduct purchase,
+                                      int remainingStock) {
+        int quantity = calculateQuantity(purchase, remainingStock);
+
+        if (!confirmPromotionNotApplied(purchase.getProductName(), quantity)) {
+            purchase.decrease(quantity);
+        }
+        int promotionUnits = purchase.getPromotionUnits();
+        paymentProductList.addPaymentProduct(purchase.createPaymentProduct(promotionUnits - 1));
+    }
+
+    private int calculateQuantity(PurchaseProduct purchase, int remainingStock) {
+        int promotionRate = purchase.getPromotionRate(Math.abs(remainingStock));
+        return remainingStock + promotionRate;
+    }
+
+    private void handleNonZeroRemainingStock(PaymentProductList paymentProductList, PurchaseProduct purchase) {
+        boolean answer = confirmPromotionAddition(purchase.getProductName());
+        int promotionUnits = purchase.getPromotionUnits();
+        if (answer) {
+            purchase.increaseQuantityForPromotion();
+            promotionUnits += 1;
+        }
+        paymentProductList.addPaymentProduct(purchase.createPaymentProduct(promotionUnits));
+    }
+
+    private void displayPaymentInfo(PaymentProductList paymentProductList) {
+        List<String> productInfos = paymentProductList.infoProduct();
+        List<String> promotionInfos = paymentProductList.infoPromotion();
+        List<String> finalResults = paymentProductList.finalResult();
+
+        outputView.printPaymentInfoResult(productInfos);
+        outputView.printPromotionInfoResult(promotionInfos);
+        outputView.printFinalResult(finalResults);
+    }
+
+    private void applyMembershipDiscountIfConfirmed(PaymentProductList paymentProductList) {
+        if (readMembershipConfirmationWithRetry()) {
+            paymentProductList.applyMembershipDiscount();
+        }
+    }
+
+    private void displayWelcomeMessage() {
+        outputView.printWelcomeMessage();
+    }
+
+    private PromotionsList loadPromotions() {
+        List<List<String>> inputPromotions = inputView.readPromotionsData();
+        List<Promotions> promotionsList1 = PromotionParser.parseToPromotions(inputPromotions);
+        return new PromotionsList(promotionsList1);
+    }
+
+    private Products loadProducts(PromotionsList promotionsList) {
+        List<List<String>> inputProducts = inputView.readProductsData();
+        List<Product> productList = ProductParser.parseToProducts(inputProducts, promotionsList);
+        return new Products(productList);
+    }
+
+    private void displayProductsInfo(Products products) {
+        outputView.printProductsInfo(products.getAllProductsInfo());
+    }
+
+    private List<PurchaseProduct> handlePurchases(Products products) {
+        while (true) {
+            try {
+                Map<String, Integer> purchases = readAndParsePurchaseInput();
+                return processPurchases(products, purchases);
+            } catch (IllegalArgumentException e) {
+                outputView.printErrorMessage(e.getMessage());
+            }
+        }
+    }
+
+    private Map<String, Integer> readAndParsePurchaseInput() {
+        String input = inputView.readPurchaseInput();
+        return PurchaseParser.parseInputProduct(input);
+    }
+
+    private List<PurchaseProduct> processPurchases(Products products, Map<String, Integer> purchases) {
+        List<PurchaseProduct> purchaseProducts = new ArrayList<>();
+        for (Map.Entry<String, Integer> entry : purchases.entrySet()) {
+            List<Product> foundProducts = products.findProductByName(entry.getKey());
+            purchaseProducts.add(new PurchaseProduct(foundProducts, entry.getValue()));
+        }
+        return purchaseProducts;
+    }
+
+    private boolean confirmPromotionNotApplied(String productName, int quantity) {
+        while (true) {
+            try {
+                outputView.printPromotionNotApplied(productName, quantity);
+                return inputView.readYesOrNoInput();
+            } catch (IllegalArgumentException e) {
+                outputView.printErrorMessage(e.getMessage());
+            }
+        }
+    }
+
+    private boolean confirmPromotionAddition(String productName) {
+        while (true) {
+            try {
+                outputView.printPromotionAddition(productName);
+                return inputView.readYesOrNoInput();
+            } catch (IllegalArgumentException e) {
+                outputView.printErrorMessage(e.getMessage());
+            }
+        }
+    }
+
+    private boolean readMembershipConfirmationWithRetry() {
+        while (true) {
+            try {
+                return inputView.readMembershipConfirmation();
+            } catch (IllegalArgumentException e) {
+                outputView.printErrorMessage(e.getMessage());
+            }
+        }
+    }
+
+    private boolean readAdditionalPurchaseConfirmationWithRetry() {
+        while (true) {
+            try {
+                return inputView.readAdditionalPurchaseConfirmation();
+            } catch (IllegalArgumentException e) {
+                outputView.printErrorMessage(e.getMessage());
+            }
+        }
+    }
+}

리뷰: 이런 부분도 remainingStock이라는 로컬 변수가 사실 purchase의 필드니까 if문의 &&를 없애고 purchase의 하나의 메시지를 보내는 쪽으로 구현했다면 가독성이 훨씬 좋았을 것 같아요!