FIX: (#145) 판매점 도메인 응용 계층을 재정의한다

src/main/java/com/zerozero/store/application/StoreService.java

@@ -0,0 +1,52 @@
+package com.zerozero.store.application;
+
+import com.zerozero.review.domain.model.ZeroDrink;
+import com.zerozero.review.domain.response.ReviewResponse;
+import com.zerozero.review.domain.service.ReadStoreReviewUseCase;
+import com.zerozero.store.domain.response.StoreResponse;
+import com.zerozero.store.domain.service.ReadStoreInfoUseCase;
+import com.zerozero.store.presentation.request.ReadStoreRequest;
+import com.zerozero.store.presentation.response.ReadStoreResponse;
+import com.zerozero.user.domain.model.User;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+@Service
+@RequiredArgsConstructor
+@Transactional(readOnly = true)
+public class StoreService {
+
+    private final ReadStoreInfoUseCase readStoreInfoUseCase;
+
+    private final ReadStoreReviewUseCase readStoreReviewUseCase;
+
+    public ReadStoreResponse readStore(ReadStoreRequest readStoreRequest, User user) {
+        StoreResponse store = readStoreInfoUseCase.execute(readStoreRequest.storeId());
+        List<ReviewResponse> reviews = readStoreReviewUseCase.execute(readStoreRequest, user);
+        return ReadStoreResponse.of(store, reviews, getTop3ZeroDrinks(reviews));
+    }
+
+    private List<ZeroDrink> getTop3ZeroDrinks(List<ReviewResponse> reviews) {
+        if (reviews == null) {
+            return Collections.emptyList();
+        }
+        List<ZeroDrink> allZeroDrinks = reviews.stream()
+                .flatMap(review -> review.zeroDrinks().stream())
+                .collect(Collectors.toList());
+
+        return allZeroDrinks.stream()
+                .collect(Collectors.groupingBy(type -> type, Collectors.counting()))
+                .entrySet().stream()
+                .sorted(Map.Entry.<ZeroDrink, Long>comparingByValue().reversed()
+                        .thenComparing(Map.Entry.comparingByKey()))
+                .limit(3)
+                .map(Map.Entry::getKey)
+                .collect(Collectors.toList());
+    }
+}