feat: Item 구매 API 추가 (#130)

Author: jaegyun1011

backend/src/main/java/com/back/domain/member/controller/ApiV1MemberController.java

@@ -190,6 +190,21 @@ public ResponseEntity<ApiResponse<MemberDto>> me() {
                 );
     }
 
+    @GetMapping("/me/statistic")
+    @Operation(summary = "회원 통계 확인", description = "클리어한 미션 카운트")
+    public ResponseEntity<ApiResponse<StatisticDto>> meStatistic() {
+        Member actor = rq.getActorFromDb();
+
+        return ResponseEntity
+                .status(HttpStatus.OK)
+                .body(new ApiResponse<>(
+                                "200",
+                                "[Member] Success: 사용자 통계 확인 (%s)".formatted(actor.getEmail()),
+                                new StatisticDto(actor.getStatistic())
+                        )
+                );
+    }
+
     @GetMapping("/me/items")
     @Operation(summary = "보유한 아이템 확인", description = "보유한 아이템 리스트 확인")
     public ResponseEntity<ApiResponse<ItemListDto>> myItems() {
@@ -288,53 +303,56 @@ public ResponseEntity<ApiResponse<MemberDto>> unequipTitle() {
                 );
     }
 
-    @PutMapping("/obtain/item/{id}")
-    @Operation(summary = "[Test] 아이템 획득", description = "아이템 획득")
-    public ResponseEntity<ApiResponse<MemberDto>> obtainItem(
+    @PutMapping("/buy/item/{id}")
+    @Operation(summary = "아이템 구매", description = "아이템 획득")
+    public ResponseEntity<ApiResponse<MemberDto>> buyItem(
             @PathVariable String id
     ) {
         Member actor = rq.getActorFromDb();
-        memberService.addItem(actor, Integer.parseInt(id));
+        memberService.buyItem(actor, Integer.parseInt(id));
 
         return ResponseEntity
                 .status(HttpStatus.OK)
                 .body(new ApiResponse<>(
                                 "200",
-                                "[Member] Success: 아이템 획득",
+                                "[Member] Success: 아이템 구매 (%s)".formatted(id),
                                 new MemberDto(actor)
                         )
                 );
     }
 
-    @PutMapping("/obtain/title/{id}")
-    @Operation(summary = "[Test] 칭호 획득", description = "칭호 획득")
-    public ResponseEntity<ApiResponse<MemberDto>> obtainTitle(
+    @PutMapping("/obtain/item/{id}")
+    @Operation(summary = "[Test] 아이템 획득", description = "아이템 획득")
+    public ResponseEntity<ApiResponse<MemberDto>> obtainItem(
             @PathVariable String id
     ) {
         Member actor = rq.getActorFromDb();
-        memberService.addTitle(actor, Integer.parseInt(id));
+        memberService.addItem(actor, Integer.parseInt(id));
 
         return ResponseEntity
                 .status(HttpStatus.OK)
                 .body(new ApiResponse<>(
                                 "200",
-                                "[Member] Success: 칭호 획득",
+                                "[Member] Success: 아이템 획득",
                                 new MemberDto(actor)
                         )
                 );
     }
 
-    @GetMapping("/me/statistic")
-    @Operation(summary = "회원 통계 확인", description = "클리어한 미션 카운트")
-    public ResponseEntity<ApiResponse<StatisticDto>> meStatistic() {
+    @PutMapping("/obtain/title/{id}")
+    @Operation(summary = "[Test] 칭호 획득", description = "칭호 획득")
+    public ResponseEntity<ApiResponse<MemberDto>> obtainTitle(
+            @PathVariable String id
+    ) {
         Member actor = rq.getActorFromDb();
+        memberService.addTitle(actor, Integer.parseInt(id));
 
         return ResponseEntity
                 .status(HttpStatus.OK)
                 .body(new ApiResponse<>(
                                 "200",
-                                "[Member] Success: 사용자 통계 확인 (%s)".formatted(actor.getEmail()),
-                                new StatisticDto(actor.getStatistic())
+                                "[Member] Success: 칭호 획득",
+                                new MemberDto(actor)
                         )
                 );
     }

backend/src/main/java/com/back/domain/member/service/MemberService.java

@@ -139,6 +139,20 @@ public void unequipTitle(Member member) {
         member.setTitle(null);
     }
 
+    //아이템 구매
+    public void buyItem(Member member, int itemId) {
+        Item item = itemRepository.findById(itemId)
+                .orElseThrow(() -> new CustomException(ErrorCode.NOT_FOUND, "[Member] Fail: 존재하지 않는 아이템"));
+        if(member.getOwnedItems().contains(item)) {
+            throw new CustomException(ErrorCode.BAD_REQUEST, "[Member] Fail: 이미 보유중인 아이템");
+        }
+        if(member.getMoney() < item.getPrice()) {
+            throw new CustomException(ErrorCode.BAD_REQUEST, "[Member] Fail: 돈 부족");
+        }
+        member.addItem(item);
+        member.setMoney(member.getMoney() - item.getPrice());
+    }
+
     // *** 미션 클리어 카운트 ***
     public void clearDaily(Member member) {
         member.getStatistic().clearDaily();