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+package store.controller;
+
+import store.domain.Product;
+import store.domain.Promotion;
+import store.domain.PromotionResult;
+import store.domain.PurchaseRecord;
+import store.service.ProductService;
+import store.utils.ErrorMessages;
+import store.utils.ProductInputParser;
+import store.validator.InputConfirmValidator;
+import store.validator.InputPurchaseValidator;
+import store.view.InputView;
+import store.view.OutputView;
+
+import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class ProductController {
+    private final ProductService productService;
+    private final OutputView outputView;
+    private final InputView inputView;
+    private final InputPurchaseValidator inputPurchaseValidator;
+    private final PromotionController promotionController;
+    private final InputConfirmValidator inputConfirmValidator;
+
+    public ProductController(ProductService productService, OutputView outputView, InputView inputView, InputPurchaseValidator inputPurchaseValidator, PromotionController promotionController, InputConfirmValidator inputConfirmValidator) {
+        this.productService = productService;
+        this.outputView = outputView;
+        this.inputView = inputView;
+        this.inputPurchaseValidator = inputPurchaseValidator;
+        this.promotionController = promotionController;
+        this.inputConfirmValidator = inputConfirmValidator;
+    }
+
+    public void printWelcomeMessage() {
+        outputView.printWelcomeMessage();
+    }
+
+    public void printProductList() {
+        List<Product> products = productService.getAllProducts();
+        outputView.printProductList(products);
+    }
+
+    public void handleInitialDisplay() {
+        this.printWelcomeMessage();
+        this.printProductList();
+    }
+
+    public void handlePurchase() {
+        boolean validInput = true;
+        while (validInput) {
+            handleInitialDisplay();
+            String input = inputView.getProductInput();
+            try {
+                Map<String, Integer> purchaseItems = getValidatedPurchaseItems(input);
+                List<PurchaseRecord> purchaseRecords = new ArrayList<>();
+
+                for (Map.Entry<String, Integer> entry : purchaseItems.entrySet()) {
+                    handleSingleProductPurchase(entry.getKey(), entry.getValue(), purchaseRecords);
+                }
+
+                BigDecimal membershipDiscount = applyMembershipDiscount(purchaseRecords);
+                updateInventory(purchaseRecords);
+                printReceipt(purchaseRecords, membershipDiscount);
+                validInput = askForAdditionalPurchase();
+            } catch (IllegalArgumentException e) {
+                outputView.printError(e.getMessage());
+            }
+        }
+    }
+
+    private boolean askForAdditionalPurchase() {
+        String confirmInput = inputView.askForAdditionalPurchase();
+        try {
+            inputConfirmValidator.validateConfirmation(confirmInput);
+        } catch (IllegalArgumentException e) {
+            outputView.printError(e.getMessage());
+            return askForAdditionalPurchase();
+        }
+        return confirmInput.equalsIgnoreCase("Y");
+    }
+
+    private void printReceipt(List<PurchaseRecord> purchaseRecords, BigDecimal membershipDiscount) {
+        outputView.printReceipt(purchaseRecords, membershipDiscount);
+    }
+
+    private Map<String, Integer> getValidatedPurchaseItems(String input) {
+        Map<String, Integer> purchaseItems = new HashMap<>();
+        String[] items = input.split(",");
+        for (String item : items) {
+            boolean validItem = false;
+            while (!validItem) {
+                try {
+                    inputPurchaseValidator.validateProductInput(item);
+                    String productName = ProductInputParser.extractProductName(item);
+                    int quantity = ProductInputParser.extractQuantity(item);
+                    inputPurchaseValidator.validateQuantity(quantity);
+                    purchaseItems.put(productName, quantity);
+                    validItem = true;
+                } catch (IllegalArgumentException e) {
+                    outputView.printError(e.getMessage());
+                    input = inputView.getProductInput();  // 전체 입력을 다시 받기
+                    return getValidatedPurchaseItems(input);  // 전체 입력을 재검증하기 위해 재귀 호출
+                }
+            }
+        }
+        return purchaseItems;
+    }
+
+    private void handleSingleProductPurchase(String productName, int quantity, List<PurchaseRecord> purchaseRecords) {
+        int promoStock;
+        while (true) {
+            try {
+                promoStock = adjustStockAndCheckForSingleProduct(productName, quantity);
+                break;
+            } catch (IllegalArgumentException e) {
+                outputView.printError(e.getMessage());
+                String input = inputView.getProductInput(); // 전체 입력을 다시 받기
+                Map<String, Integer> purchaseItems = getValidatedPurchaseItems(input);
+                purchaseRecords.clear(); // 기존의 잘못된 purchaseRecords 초기화
+
+                for (Map.Entry<String, Integer> entry : purchaseItems.entrySet()) {
+                    handleSingleProductPurchase(entry.getKey(), entry.getValue(), purchaseRecords);
+                }
+                return;
+            }
+        }
+
+        Product product = productService.getProductByName(productName);
+        if (product == null) {
+            nonApplyPromotion(productName, quantity, purchaseRecords);
+            return;
+        }
+
+        if (product.getPromotion() == null) {
+            nonApplyPromotion(productName, quantity, purchaseRecords);
+            return;
+        }
+
+        String promotionName = product.getPromotion();
+        Promotion applicablePromotion = promotionController.validatePromotionDate(promotionName);
+        if (applicablePromotion == null) {
+            nonApplyPromotion(productName, quantity, purchaseRecords);
+            return;
+        }
+
+        PromotionResult promotionResult = promotionController.applyPromotionLogic(productName, quantity, promotionName, product.getPrice(), promoStock);
+        applyPromotion(productName, quantity, purchaseRecords, promotionResult);
+    }
+
+    private void applyPromotion(String productName, int quantity, List<PurchaseRecord> purchaseRecords, PromotionResult promotionResult) {
+        Product product = productService.getProductByName(productName);
+        BigDecimal productPrice = product.getPrice();
+        int updatedQuantity = promotionResult.getUpdatedQuantity();
+        PurchaseRecord record = new PurchaseRecord(
+                productName,
+                updatedQuantity,
+                promotionResult.getFreeQuantity(),
+                promotionResult.getDiscountAmount(),
+                productPrice.multiply(BigDecimal.valueOf(updatedQuantity)),
+                promotionResult.getPromotionalAmount()
+        );
+        purchaseRecords.add(record);
+    }
+
+    private void nonApplyPromotion(String productName, int quantity, List<PurchaseRecord> purchaseRecords) {
+        Product product = productService.getProductByName(productName);
+        PurchaseRecord record = new PurchaseRecord(
+                productName,
+                quantity,
+                0,
+                BigDecimal.ZERO,
+                product.getPrice().multiply(BigDecimal.valueOf(quantity)),
+                BigDecimal.ZERO
+        );
+        purchaseRecords.add(record);
+    }
+
+    private BigDecimal applyMembershipDiscount(List<PurchaseRecord> purchaseRecords) {
+        BigDecimal totalDiscountableAmount = BigDecimal.ZERO;
+
+        for (PurchaseRecord record : purchaseRecords) {
+            totalDiscountableAmount = totalDiscountableAmount.add(record.getTotalCost().subtract(record.getPromotionalAmount()));
+        }
+
+
+            String confirmInput = inputView.isMembershipInvalid();
+            try {
+                inputConfirmValidator.validateConfirmation(confirmInput);
+            } catch (IllegalArgumentException e) {
+                outputView.printError(e.getMessage());
+                return applyMembershipDiscount(purchaseRecords);
+            }
+            if (!confirmInput.equalsIgnoreCase("Y")) {
+                return BigDecimal.ZERO;
+            }
+
+
+        BigDecimal membershipDiscount = totalDiscountableAmount.multiply(BigDecimal.valueOf(0.3));
+        BigDecimal maxMembershipDiscount = BigDecimal.valueOf(8000);
+        if (membershipDiscount.compareTo(maxMembershipDiscount) > 0) {
+            return maxMembershipDiscount;
+        }
+
+        return membershipDiscount;
+    }
+
+    private int adjustStockAndCheckForSingleProduct(String productName, int quantity) {
+        Product promoProduct = productService.getProductByNameAndPromotion(productName, true);
+        Product normalProduct = productService.getProductByNameAndPromotion(productName, false);
+
+        int promoStock = getPromoStock(promoProduct);
+        int normalStock = getNormalStock(normalProduct);
+
+        if (quantity > promoStock + normalStock) {
+            throw new IllegalArgumentException(ErrorMessages.INSUFFICIENT_STOCK_MESSAGE);
+        }
+        if (quantity > promoStock && promoProduct != null) {
+            return confirmPartialFullPricePayment(quantity, promoStock, productName);
+        }
+        return promoStock;
+    }
+
+    private int confirmPartialFullPricePayment(int quantity, int promoStock, String productName) {
+        String confirmInput = inputView.isPromotionInvalid((quantity - promoStock), productName);
+        try {
+            inputConfirmValidator.validateConfirmation(confirmInput);
+        } catch (IllegalArgumentException e) {
+            outputView.printError(e.getMessage());
+            return confirmPartialFullPricePayment(quantity, promoStock, productName);
+        }
+        if (confirmInput.equalsIgnoreCase("Y")) {
+            return promoStock;
+        }
+        return -1;
+    }
+
+    private int getPromoStock(Product promoProduct) {
+        if (promoProduct == null) {
+            return 0;
+        }
+        return promoProduct.getStockQuantity();
+    }
+
+    private int getNormalStock(Product normalProduct) {
+        if (normalProduct == null) {
+            return 0;
+        }
+        return normalProduct.getStockQuantity();
+    }
+
+    private void updateInventory(List<PurchaseRecord> purchaseItems) {
+        for (PurchaseRecord record : purchaseItems) {
+            String productName = record.getProductName();
+            int totalQuantity = record.getPurchasedQuantity();
+
+            Product promoProduct = productService.getProductByNameAndPromotion(productName, true);
+            Product normalProduct = productService.getProductByNameAndPromotion(productName, false);
+
+            int remainingQuantity = totalQuantity;
+
+            if (promoProduct != null && promoProduct.getStockQuantity() > 0) {
+                int promoUsed = Math.min(promoProduct.getStockQuantity(), remainingQuantity);
+                promoProduct.decreaseStock(promoUsed);
+                remainingQuantity -= promoUsed;
+            }
+
+            if (remainingQuantity > 0 && normalProduct != null && normalProduct.getStockQuantity() >= remainingQuantity) {
+                normalProduct.decreaseStock(remainingQuantity);
+            }
+        }
+    }
+}

리뷰: 들여쓰기 줄이기 위해 이 부분을 메서드로 빼도 될것 같아요.