refactor: 상품 상세 정보 API 수정

* 상품 상세 정보 조회 시 랭킹 정보도 함께 조회하도록 수정하면서 기존 API 수정

- 반환타입 수정
- Facade 수정
- DTO 수정

Author: Kimjipang

apps/commerce-api/src/main/java/com/loopers/application/product/ProductFacade.java

@@ -17,6 +17,8 @@
 import org.springframework.transaction.annotation.Transactional;
 
 import java.math.BigDecimal;
+import java.time.LocalDate;
+import java.time.format.DateTimeFormatter;
 import java.util.List;
 
 @Component
@@ -25,6 +27,7 @@ public class ProductFacade {
     private final ProductRepository productRepository;
     private final BrandRepository brandRepository;
     private final OutboxRepository outBoxRepository;
+    private final RankingRedisReader rankingRedisReader;
 
     @Transactional
     public ProductInfo registerProduct(ProductV1Dto.ProductRequest request) {
@@ -52,7 +55,7 @@ public List<ProductInfo> findAllProducts() {
 
     @Transactional
     @Cacheable(value = "product", key = "#id")
-    public ProductInfo findProductById(Long id) {
+    public ProductRankingInfo findProductById(Long id) {
         Product product = productRepository.findById(id).orElseThrow(
                 () -> new CoreException(ErrorType.NOT_FOUND, "찾고자 하는 상품이 존재하지 않습니다.")
         );
@@ -65,7 +68,14 @@ public ProductInfo findProductById(Long id) {
 
         outBoxRepository.save(outBoxEvent);
 
-        return ProductInfo.from(product);
+        RankingInfo ranking = null;
+
+        try {
+            String date = LocalDate.now().format(DateTimeFormatter.BASIC_ISO_DATE);
+            ranking = rankingRedisReader.getDailyRanking(date, product.getId());
+        } catch (Exception ignored) {}
+
+        return ProductRankingInfo.from(product, ranking);
     }
 
     @Transactional(readOnly = true)

apps/commerce-api/src/main/java/com/loopers/application/product/ProductRankingInfo.java

@@ -0,0 +1,20 @@
+package com.loopers.application.product;
+
+import com.loopers.domain.product.Product;
+
+import java.math.BigDecimal;
+
+public record ProductRankingInfo(Long id, Long brandId, String name, BigDecimal price, int stock, int likeCount, int rank, double score) {
+    public static ProductRankingInfo from(Product product, RankingInfo ranking) {
+        return new ProductRankingInfo(
+                product.getId(),
+                product.getBrandId(),
+                product.getName(),
+                product.getPrice(),
+                product.getStock(),
+                product.getLikeCount(),
+                ranking.rank(),
+                ranking.score()
+        );
+    }
+}

apps/commerce-api/src/main/java/com/loopers/application/product/RankingInfo.java

@@ -0,0 +1,9 @@
+package com.loopers.application.product;
+
+public record RankingInfo(
+        String date,
+        double score,
+        int rank,
+        Long total
+) {
+}

apps/commerce-api/src/main/java/com/loopers/interfaces/api/product/ProductV1ApiSpec.java

@@ -15,7 +15,7 @@ public interface ProductV1ApiSpec {
     ApiResponse<List<ProductV1Dto.ProductResponse>> findAllProducts();
 
     @Operation(summary = "상품 상세 조회")
-    ApiResponse<ProductV1Dto.ProductResponse> findProductById(Long id);
+    ApiResponse<ProductV1Dto.ProductRankingResponse> findProductById(Long id);
 
     @Operation(summary = "상품 정렬 조회")
     ApiResponse<List<ProductV1Dto.ProductResponse>> findProductsBySortCondition(ProductV1Dto.SearchProductRequest request);

apps/commerce-api/src/main/java/com/loopers/interfaces/api/product/ProductV1Controller.java

@@ -2,6 +2,7 @@
 
 import com.loopers.application.product.ProductFacade;
 import com.loopers.application.product.ProductInfo;
+import com.loopers.application.product.ProductRankingInfo;
 import com.loopers.interfaces.api.ApiResponse;
 import lombok.RequiredArgsConstructor;
 import org.springframework.web.bind.annotation.GetMapping;
@@ -42,9 +43,9 @@ public ApiResponse<List<ProductV1Dto.ProductResponse>> findAllProducts() {
 
     @GetMapping("/{id}")
     @Override
-    public ApiResponse<ProductV1Dto.ProductResponse> findProductById(@PathVariable Long id) {
-        ProductInfo info = productFacade.findProductById(id);
-        ProductV1Dto.ProductResponse response = ProductV1Dto.ProductResponse.from(info);
+    public ApiResponse<ProductV1Dto.ProductRankingResponse> findProductById(@PathVariable Long id) {
+        ProductRankingInfo info = productFacade.findProductById(id);
+        ProductV1Dto.ProductRankingResponse response = ProductV1Dto.ProductRankingResponse.from(info);
 
         return ApiResponse.success(response);
     }

apps/commerce-api/src/main/java/com/loopers/interfaces/api/product/ProductV1Dto.java

@@ -1,13 +1,27 @@
 package com.loopers.interfaces.api.product;
 
 import com.loopers.application.product.ProductInfo;
+import com.loopers.application.product.ProductRankingInfo;
 import com.loopers.domain.product.Product;
 import com.loopers.support.error.CoreException;
 import com.loopers.support.error.ErrorType;
 
 import java.math.BigDecimal;
 
 public class ProductV1Dto {
+    public record ProductRankingResponse(Long id, Long brandId, String name, BigDecimal price, int stock, int rank, double score) {
+        public static ProductRankingResponse from(ProductRankingInfo info) {
+            return new ProductRankingResponse(
+                    info.id(),
+                    info.brandId(),
+                    info.name(),
+                    info.price(),
+                    info.stock(),
+                    info.rank(),
+                    info.score()
+            );
+        }
+    }
     public record ProductResponse(Long id, Long brandId, String name, BigDecimal price, int stock, int likeCount) {
         public static ProductResponse from(ProductInfo info) {
             return new ProductResponse(