Merge pull request #45 from THEGOODs-repo/feature/44

[feature/44] 장바구니 옵션 수정 API 구현

src/main/java/com/umc/TheGoods/apiPayload/code/status/ErrorStatus.java

@@ -32,6 +32,10 @@ public enum ErrorStatus implements BaseErrorCode {
     ORDER_ITEM_UPDATE_FAIL(HttpStatus.BAD_REQUEST, "ORDER4008", "주문 상품 정보 변경이 불가합니다."),
     NULL_AMOUNT_ERROR(HttpStatus.BAD_REQUEST, "ORDER4009", "주문 수량은 null일 수 없습니다."),
 
+    // 장바구니 관련 에러
+    CART_NOT_FOUND(HttpStatus.NOT_FOUND, "CART4001", "해당 장바구니 내역을 찾을 수 없습니다."),
+    NOT_CART_OWNER(HttpStatus.BAD_REQUEST, "CART4002", "본인의 장바구니 내역이 아닙니다. 접근할 수 없습니다."),
+
     // test
     TEMP_EXCEPTION(HttpStatus.BAD_REQUEST, "TEMP4001", "테스트"),
 

src/main/java/com/umc/TheGoods/domain/order/Cart.java

@@ -59,4 +59,9 @@ public void setItemOption(ItemOption itemOption) {
         this.itemOption = itemOption;
         itemOption.getCartList().add(this);
     }
+
+    public Cart updateAmount(Integer amount) {
+        this.amount = amount;
+        return this;
+    }
 }

src/main/java/com/umc/TheGoods/repository/cart/CartRepository.java

@@ -1,7 +1,17 @@
 package com.umc.TheGoods.repository.cart;
 
+import com.umc.TheGoods.domain.item.Item;
+import com.umc.TheGoods.domain.item.ItemOption;
+import com.umc.TheGoods.domain.member.Member;
 import com.umc.TheGoods.domain.order.Cart;
 import org.springframework.data.jpa.repository.JpaRepository;
 
+import java.util.Optional;
+
 public interface CartRepository extends JpaRepository<Cart, Long> {
+
+    Optional<Cart> findByMemberAndItemAndItemOption(Member member, Item item, ItemOption itemOption);
+
+    Optional<Cart> findByMemberAndItem(Member member, Item item);
+
 }

src/main/java/com/umc/TheGoods/service/CartService/CartCommandService.java

@@ -1,9 +1,12 @@
 package com.umc.TheGoods.service.CartService;
 
 import com.umc.TheGoods.domain.member.Member;
+import com.umc.TheGoods.domain.order.Cart;
 import com.umc.TheGoods.web.dto.cart.CartRequestDTO;
 
 public interface CartCommandService {
 
     void addCart(CartRequestDTO.cartAddDTO request, Member member);
+
+    Cart updateCart(CartRequestDTO.cartUpdateDTO request, Member member);
 }

src/main/java/com/umc/TheGoods/service/CartService/CartCommandServiceImpl.java

@@ -16,6 +16,7 @@
 import org.springframework.transaction.annotation.Transactional;
 
 import java.util.List;
+import java.util.Optional;
 import java.util.stream.Collectors;
 
 @Service
@@ -50,14 +51,25 @@ public void addCart(CartRequestDTO.cartAddDTO request, Member member) {
                     throw new OrderHandler(ErrorStatus.LACK_OF_STOCK);
                 }
 
-                // cart 테이블에 해당 장바구니 내역 이미 존재하면, 해당 내역의 담은 수량만 업데이트하는 부분 추가 필요
-
-                // cart 엔티티 생성 및 연관관계 매핑
-                Cart cart = CartConverter.toCart(cartOptionAddDTO.getAmount());
-                cart.setMember(member);
-                cart.setItem(item);
-                cart.setItemOption(itemOption);
-                return cart;
+                // cart 테이블에 해당 장바구니 내역 이미 존재하면, 해당 내역의 담은 수량만 업데이트
+                Optional<Cart> existCart = cartRepository.findByMemberAndItemAndItemOption(member, item, itemOption);
+                if (!existCart.isEmpty()) { // 장바구니 내역 이미 존재하는 경우
+                    // 재고 수량과 비교
+                    if (cartOptionAddDTO.getAmount() + existCart.get().getAmount() > itemOption.getStock()) {
+                        throw new OrderHandler(ErrorStatus.LACK_OF_STOCK);
+                    }
+
+                    // 장바구니 내역의 수량 업데이트
+                    existCart.get().updateAmount(existCart.get().getAmount() + cartOptionAddDTO.getAmount());
+                    return existCart.get();
+                } else { // 신규 장바구니 내역 생성
+                    // cart 엔티티 생성 및 연관관계 매핑
+                    Cart cart = CartConverter.toCart(cartOptionAddDTO.getAmount());
+                    cart.setMember(member);
+                    cart.setItem(item);
+                    cart.setItemOption(itemOption);
+                    return cart;
+                }
             }).collect(Collectors.toList());
 
             // 엔티티 저장
@@ -79,16 +91,51 @@ public void addCart(CartRequestDTO.cartAddDTO request, Member member) {
                 throw new OrderHandler(ErrorStatus.LACK_OF_STOCK);
             }
 
-            // cart 테이블에 해당 장바구니 내역 이미 존재하면, 해당 내역의 담은 수량만 업데이트하는 부분 추가 필요
+            Optional<Cart> existCart = cartRepository.findByMemberAndItem(member, item);
+            if (!existCart.isEmpty()) { // 장바구니 내역 이미 존재하는 경우
+                // 재고 수량과 비교
+                if (request.getAmount() + existCart.get().getAmount() > item.getStock()) {
+                    throw new OrderHandler(ErrorStatus.LACK_OF_STOCK);
+                }
+
+                // 장바구니 내역의 수량 업데이트
+                existCart.get().updateAmount(request.getAmount());
+            } else { // 장바구니 내역 신규 생성
 
+                // cart 엔티티 생성 및 연관관계 매핑
+                Cart cart = CartConverter.toCart(request.getAmount());
+                cart.setMember(member);
+                cart.setItem(item);
+
+                // 엔티티 저장
+                cartRepository.save(cart);
+            }
 
-            // cart 엔티티 생성 및 연관관계 매핑
-            Cart cart = CartConverter.toCart(request.getAmount());
-            cart.setMember(member);
-            cart.setItem(item);
 
-            // 엔티티 저장
-            cartRepository.save(cart);
         }
     }
+
+    @Override
+    public Cart updateCart(CartRequestDTO.cartUpdateDTO request, Member member) {
+        // cart 존재 여부 검증은 annotation에서 진행
+        Cart cart = cartRepository.findById(request.getCartId()).get();
+
+        // 해당 cart 내역을 수정할 권한 있는지 검증
+        if (!cart.getMember().equals(member)) {
+            throw new OrderHandler(ErrorStatus.NOT_CART_OWNER);
+        }
+
+        // 재고 수량과 비교
+        if (!cart.getItem().getItemOptionList().isEmpty()) { // 상품 옵션이 있는 경우
+            if (request.getAmount() > cart.getItemOption().getStock()) {
+                throw new OrderHandler(ErrorStatus.LACK_OF_STOCK);
+            }
+        } else {
+            if (request.getAmount() > cart.getItem().getStock()) {
+                throw new OrderHandler(ErrorStatus.LACK_OF_STOCK);
+            }
+        }
+
+        return cart.updateAmount(request.getAmount());
+    }
 }

src/main/java/com/umc/TheGoods/service/CartService/CartQueryService.java

@@ -0,0 +1,6 @@
+package com.umc.TheGoods.service.CartService;
+
+public interface CartQueryService {
+
+    boolean isExistCart(Long cartId);
+}

src/main/java/com/umc/TheGoods/service/CartService/CartQueryServiceImpl.java

@@ -0,0 +1,20 @@
+package com.umc.TheGoods.service.CartService;
+
+import com.umc.TheGoods.repository.cart.CartRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@RequiredArgsConstructor
+@Transactional(readOnly = true)
+public class CartQueryServiceImpl implements CartQueryService {
+
+    private final CartRepository cartRepository;
+
+
+    @Override
+    public boolean isExistCart(Long cartId) {
+        return cartRepository.existsById(cartId);
+    }
+}

src/main/java/com/umc/TheGoods/validation/annotation/ExistCart.java

@@ -0,0 +1,19 @@
+package com.umc.TheGoods.validation.annotation;
+
+import com.umc.TheGoods.validation.validator.CartExistValidator;
+
+import javax.validation.Constraint;
+import javax.validation.Payload;
+import java.lang.annotation.*;
+
+@Documented
+@Constraint(validatedBy = CartExistValidator.class)
+@Target({ElementType.METHOD, ElementType.FIELD, ElementType.PARAMETER})
+@Retention(RetentionPolicy.RUNTIME)
+public @interface ExistCart {
+    String message() default "해당 장바구니 내역을 찾을 수 없습니다.";
+
+    Class<?>[] groups() default {};
+
+    Class<? extends Payload>[] payload() default {};
+}

src/main/java/com/umc/TheGoods/validation/validator/CartExistValidator.java

@@ -0,0 +1,32 @@
+package com.umc.TheGoods.validation.validator;
+
+import com.umc.TheGoods.apiPayload.code.status.ErrorStatus;
+import com.umc.TheGoods.service.CartService.CartQueryService;
+import com.umc.TheGoods.validation.annotation.ExistCart;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Component;
+
+import javax.validation.ConstraintValidator;
+import javax.validation.ConstraintValidatorContext;
+
+@Component
+@RequiredArgsConstructor
+public class CartExistValidator implements ConstraintValidator<ExistCart, Long> {
+
+    private final CartQueryService cartQueryService;
+
+    @Override
+    public void initialize(ExistCart constraintAnnotation) {
+        ConstraintValidator.super.initialize(constraintAnnotation);
+    }
+
+    @Override
+    public boolean isValid(Long value, ConstraintValidatorContext context) {
+        boolean isValid = cartQueryService.isExistCart(value);
+        if (!isValid) {
+            context.disableDefaultConstraintViolation();
+            context.buildConstraintViolationWithTemplate(ErrorStatus.CART_NOT_FOUND.getMessage()).addConstraintViolation();
+        }
+        return isValid;
+    }
+}

src/main/java/com/umc/TheGoods/web/controller/CartController.java

@@ -14,10 +14,7 @@
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.security.core.Authentication;
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestBody;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.*;
 
 import javax.validation.Valid;
 
@@ -56,5 +53,26 @@ public ApiResponse<String> add(@RequestBody @Valid CartRequestDTO.cartAddDTO req
         return ApiResponse.onSuccess("장바구니 담기 성공");
     }
 
+    @PutMapping
+    @Operation(summary = "장바구니 옵션 수정 API", description = "해당 장바구니 내역의 담은 수량을 수정하는 API 입니다.")
+    @ApiResponses(value = {
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "COMMON200", description = "OK, 성공"),
+    })
+    public ApiResponse<String> update(@RequestBody @Valid CartRequestDTO.cartUpdateDTO request,
+                                      Authentication authentication) {
+        // 비회원인 경우 처리 불가
+        if (authentication == null) {
+            throw new MemberHandler(ErrorStatus._UNAUTHORIZED);
+        }
+
+        // request에서 member id 추출해 Member 엔티티 찾기
+        MemberDetail memberDetail = (MemberDetail) authentication.getPrincipal();
+        Member member = memberQueryService.findMemberById(memberDetail.getMemberId()).orElseThrow(() -> new MemberHandler(ErrorStatus.MEMBER_NOT_FOUND));
+
+        cartCommandService.updateCart(request, member);
+
+        return ApiResponse.onSuccess("장바구니 옵션 수정 성공");
+    }
+
 
 }

src/main/java/com/umc/TheGoods/web/dto/cart/CartRequestDTO.java

@@ -1,5 +1,6 @@
 package com.umc.TheGoods.web.dto.cart;
 
+import com.umc.TheGoods.validation.annotation.ExistCart;
 import com.umc.TheGoods.validation.annotation.ExistItem;
 import com.umc.TheGoods.validation.annotation.ExistItemOption;
 import lombok.Getter;
@@ -39,4 +40,16 @@ public static class cartOptionAddDTO {
 
     }
 
+    @Getter
+    public static class cartUpdateDTO {
+        @NotNull
+        @ExistCart
+        Long cartId;
+
+        @Min(1)
+        @Max(100000)
+        @NotNull
+        Integer amount;
+    }
+
 }