@@ -0,0 +1,81 @@
+package store.handler;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+import store.domain.Product;
+
+public class ProductsFileHandler {
+    private static final Path PRODUCTS_FILE_PATH = Path.of("src/main/resources/products.md");
+    public static final String HEADER = "name,price,quantity,promotion";
+
+    private final Path latestFilePath;
+
+    public ProductsFileHandler(Path latestFilePath) {
+        this.latestFilePath = latestFilePath;
+    }
+
+    public void loadLatestProductsFile() throws IOException {
+        List<Product> products = parseItemsFromFile(PRODUCTS_FILE_PATH);
+        Map<String, Boolean> nonPromotionalEntries = identifyNonPromotionalProducts(products);
+        List<String> lines = buildProductLines(products, nonPromotionalEntries);
+        Files.write(latestFilePath, lines);
+    }
+
+    public List<Product> parseItemsFromFile(Path path) throws IOException {
+        try (Stream<String> lines = Files.lines(path)) {
+            return lines.skip(1)
+                    .map(this::parseProductLine)
+                    .collect(Collectors.toList());
+        }
+    }
+
+    public boolean shouldAddNonPromotional(Product product, Map<String, Boolean> nonPromotionalEntries) {
+        return product.hasPromotion() && !nonPromotionalEntries.getOrDefault(product.getName(), false);
+    }
+
+    public String formatProductLine(Product product) {
+        return String.format("%s,%d,%d,%s", product.getName(), product.getPrice(),
+                product.getQuantity(), product.promoName());
+    }
+
+    private Product parseProductLine(String line) {
+        String[] parts = line.split(",");
+        return new Product(
+                parts[0].trim(),
+                Integer.parseInt(parts[1].trim()),
+                Integer.parseInt(parts[2].trim()),
+                PromotionsFileHandler.getPromotionByName(parts[3].trim())
+        );
+    }
+
+    private Map<String, Boolean> identifyNonPromotionalProducts(List<Product> products) {
+        Map<String, Boolean> nonPromotionalEntries = new HashMap<>();
+        products.stream()
+                .filter(product -> !product.hasPromotion())
+                .forEach(product -> nonPromotionalEntries.put(product.getName(), true));
+        return nonPromotionalEntries;
+    }
+
+    private List<String> buildProductLines(List<Product> products, Map<String, Boolean> nonPromotionalEntries) {
+        List<String> lines = new ArrayList<>();
+        lines.add(HEADER);
+        products.forEach(product -> addProductLines(lines, product, nonPromotionalEntries));
+        return lines;
+    }
+
+    private void addProductLines(List<String> lines, Product product, Map<String, Boolean> nonPromotionalEntries) {
+        lines.add(formatProductLine(product));
+        if (shouldAddNonPromotional(product, nonPromotionalEntries)) {
+            lines.add(formatProductLine(
+                    new Product(product.getName(), product.getPrice(), 0, PromotionsFileHandler.NON_PROMOTION)));
+            nonPromotionalEntries.put(product.getName(), true);
+        }
+    }
+}

리뷰: `0`이 의미하는 바가 무엇인지 알 수 있을까요?