[BE] feat: 상품 검색 기능 구현

backend/src/main/java/com/funeat/product/application/ProductService.java

@@ -12,6 +12,10 @@
 import com.funeat.product.dto.ProductsInCategoryResponse;
 import com.funeat.product.dto.RankingProductDto;
 import com.funeat.product.dto.RankingProductsResponse;
+import com.funeat.product.dto.SearchProductDto;
+import com.funeat.product.dto.SearchProductResultDto;
+import com.funeat.product.dto.SearchProductResultsResponse;
+import com.funeat.product.dto.SearchProductsResponse;
 import com.funeat.product.exception.CategoryException.CategoryNotFoundException;
 import com.funeat.product.exception.ProductException.ProductNotFoundException;
 import com.funeat.product.persistence.CategoryRepository;
@@ -93,4 +97,26 @@ public RankingProductsResponse getTop3Products() {
 
         return RankingProductsResponse.toResponse(rankingProductDtos);
     }
+
+    public SearchProductsResponse searchProducts(final String query, final Pageable pageable) {
+        final Page<Product> products = productRepository.findAllByNameContaining(query, pageable);
+
+        final PageDto pageDto = PageDto.toDto(products);
+        final List<SearchProductDto> productDtos = products.stream()
+                .map(SearchProductDto::toDto)
+                .collect(Collectors.toList());
+
+        return SearchProductsResponse.toResponse(pageDto, productDtos);
+    }
+
+    public SearchProductResultsResponse getSearchResults(final String query, final Pageable pageable) {
+        final Page<ProductReviewCountDto> products = productRepository.findAllWithReviewCountByNameContaining(query, pageable);
+
+        final PageDto pageDto = PageDto.toDto(products);
+        final List<SearchProductResultDto> resultDtos = products.stream()
+                .map(it -> SearchProductResultDto.toDto(it.getProduct(), it.getReviewCount()))
+                .collect(Collectors.toList());
+
+        return SearchProductResultsResponse.toResponse(pageDto, resultDtos);
+    }
 }

backend/src/main/java/com/funeat/product/dto/SearchProductDto.java

@@ -0,0 +1,32 @@
+package com.funeat.product.dto;
+
+import com.funeat.product.domain.Product;
+
+public class SearchProductDto {
+
+    private final Long id;
+    private final String name;
+    private final String categoryType;
+
+    public SearchProductDto(final Long id, final String name, final String categoryType) {
+        this.id = id;
+        this.name = name;
+        this.categoryType = categoryType;
+    }
+
+    public static SearchProductDto toDto(final Product product) {
+        return new SearchProductDto(product.getId(), product.getName(), product.getCategory().getType().getName());
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getCategoryType() {
+        return categoryType;
+    }
+}

backend/src/main/java/com/funeat/product/dto/SearchProductResultDto.java

@@ -0,0 +1,58 @@
+package com.funeat.product.dto;
+
+import com.funeat.product.domain.Product;
+
+public class SearchProductResultDto {
+
+    private final Long id;
+    private final String name;
+    private final Long price;
+    private final String image;
+    private final Double averageRating;
+    private final Long reviewCount;
+    private final String categoryType;
+
+    public SearchProductResultDto(final Long id, final String name, final Long price, final String image,
+                                  final Double averageRating, final Long reviewCount, final String categoryType) {
+        this.id = id;
+        this.name = name;
+        this.price = price;
+        this.image = image;
+        this.averageRating = averageRating;
+        this.reviewCount = reviewCount;
+        this.categoryType = categoryType;
+    }
+
+    public static SearchProductResultDto toDto(final Product product, final Long reviewCount) {
+        return new SearchProductResultDto(product.getId(), product.getName(), product.getPrice(), product.getImage(),
+                product.getAverageRating(), reviewCount, product.getCategory().getType().getName());
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Long getPrice() {
+        return price;
+    }
+
+    public String getImage() {
+        return image;
+    }
+
+    public Double getAverageRating() {
+        return averageRating;
+    }
+
+    public Long getReviewCount() {
+        return reviewCount;
+    }
+
+    public String getCategoryType() {
+        return categoryType;
+    }
+}

backend/src/main/java/com/funeat/product/dto/SearchProductResultsResponse.java

@@ -0,0 +1,28 @@
+package com.funeat.product.dto;
+
+import com.funeat.common.dto.PageDto;
+import java.util.List;
+
+public class SearchProductResultsResponse {
+
+    private final PageDto page;
+    private final List<SearchProductResultDto> products;
+
+    public SearchProductResultsResponse(final PageDto page, final List<SearchProductResultDto> products) {
+        this.page = page;
+        this.products = products;
+    }
+
+    public static SearchProductResultsResponse toResponse(final PageDto page,
+                                                          final List<SearchProductResultDto> products) {
+        return new SearchProductResultsResponse(page, products);
+    }
+
+    public PageDto getPage() {
+        return page;
+    }
+
+    public List<SearchProductResultDto> getProducts() {
+        return products;
+    }
+}

backend/src/main/java/com/funeat/product/dto/SearchProductsResponse.java

@@ -0,0 +1,27 @@
+package com.funeat.product.dto;
+
+import com.funeat.common.dto.PageDto;
+import java.util.List;
+
+public class SearchProductsResponse {
+
+    private final PageDto page;
+    private final List<SearchProductDto> products;
+
+    public SearchProductsResponse(final PageDto page, final List<SearchProductDto> products) {
+        this.page = page;
+        this.products = products;
+    }
+
+    public static SearchProductsResponse toResponse(final PageDto page, final List<SearchProductDto> products) {
+        return new SearchProductsResponse(page, products);
+    }
+
+    public PageDto getPage() {
+        return page;
+    }
+
+    public List<SearchProductDto> getProducts() {
+        return products;
+    }
+}

backend/src/main/java/com/funeat/product/persistence/ProductRepository.java

@@ -36,4 +36,20 @@ public interface ProductRepository extends JpaRepository<Product, Long> {
             + "WHERE p.averageRating > 3.0 "
             + "GROUP BY p.id")
     List<ProductReviewCountDto> findAllByAverageRatingGreaterThan3();
+
+    @Query("SELECT p FROM Product p "
+            + "WHERE p.name LIKE CONCAT('%', :name, '%') "
+            + "ORDER BY CASE "
+            + "WHEN p.name LIKE CONCAT(:name, '%') THEN 1 "
+            + "ELSE 2 END")
+    Page<Product> findAllByNameContaining(@Param("name") final String name, final Pageable pageable);
+
+    @Query("SELECT new com.funeat.product.dto.ProductReviewCountDto(p, COUNT(r.id)) FROM Product p "
+            + "LEFT JOIN Review r ON r.product.id = p.id "
+            + "WHERE p.name LIKE CONCAT('%', :name, '%') "
+            + "GROUP BY p.id "
+            + "ORDER BY CASE "
+            + "WHEN p.name LIKE CONCAT(:name, '%') THEN 1 "
+            + "ELSE 2 END")
+    Page<ProductReviewCountDto> findAllWithReviewCountByNameContaining(@Param("name") final String name, final Pageable pageable);
 }

backend/src/main/java/com/funeat/product/presentation/ProductApiController.java

@@ -4,12 +4,16 @@
 import com.funeat.product.dto.ProductResponse;
 import com.funeat.product.dto.ProductsInCategoryResponse;
 import com.funeat.product.dto.RankingProductsResponse;
+import com.funeat.product.dto.SearchProductResultsResponse;
+import com.funeat.product.dto.SearchProductsResponse;
+import org.springframework.data.domain.PageRequest;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.web.PageableDefault;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
 @RestController
@@ -40,4 +44,20 @@ public ResponseEntity<RankingProductsResponse> getRankingProducts() {
         final RankingProductsResponse response = productService.getTop3Products();
         return ResponseEntity.ok(response);
     }
+
+    @GetMapping("/search/products")
+    public ResponseEntity<SearchProductsResponse> searchProducts(@RequestParam final String query,
+                                                                 @PageableDefault final Pageable pageable) {
+        final PageRequest pageRequest = PageRequest.of(pageable.getPageNumber(), pageable.getPageSize());
+        final SearchProductsResponse response = productService.searchProducts(query, pageRequest);
+        return ResponseEntity.ok(response);
+    }
+
+    @GetMapping("/search/products/results")
+    public ResponseEntity<SearchProductResultsResponse> getSearchResults(@RequestParam final String query,
+                                                                         @PageableDefault final Pageable pageable) {
+        final PageRequest pageRequest = PageRequest.of(pageable.getPageNumber(), pageable.getPageSize());
+        final SearchProductResultsResponse response = productService.getSearchResults(query, pageRequest);
+        return ResponseEntity.ok(response);
+    }
 }

backend/src/main/java/com/funeat/product/presentation/ProductController.java

@@ -3,6 +3,8 @@
 import com.funeat.product.dto.ProductResponse;
 import com.funeat.product.dto.ProductsInCategoryResponse;
 import com.funeat.product.dto.RankingProductsResponse;
+import com.funeat.product.dto.SearchProductResultsResponse;
+import com.funeat.product.dto.SearchProductsResponse;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
 import io.swagger.v3.oas.annotations.tags.Tag;
@@ -11,6 +13,7 @@
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestParam;
 
 @Tag(name = "01.Product", description = "상품 기능")
 public interface ProductController {
@@ -40,4 +43,22 @@ ResponseEntity<ProductsInCategoryResponse> getAllProductsInCategory(
     )
     @GetMapping
     ResponseEntity<RankingProductsResponse> getRankingProducts();
+
+    @Operation(summary = "상품 자동 완성 검색", description = "공통 상품 및 PB 상품들의 이름 중에 해당하는 문자열이 포함되어 있는지 검색한다.")
+    @ApiResponse(
+            responseCode = "200",
+            description = "상품 검색 성공."
+    )
+    @GetMapping
+    ResponseEntity<SearchProductsResponse> searchProducts(@RequestParam final String query,
+                                                          @PageableDefault final Pageable pageable);
+
+    @Operation(summary = "상품 검색 결과 조회", description = "문자열을 받아 상품을 검색하고 검색 결과들을 조회한다.")
+    @ApiResponse(
+            responseCode = "200",
+            description = "상품 검색 결과 조회 성공."
+    )
+    @GetMapping
+    ResponseEntity<SearchProductResultsResponse> getSearchResults(@RequestParam final String query,
+                                                                  @PageableDefault final Pageable pageable);
 }