[FEAT] 한달 예산 금액 조회 API 구현

src/main/java/umc/haruchi/converter/MonthBudgetConverter.java

@@ -25,4 +25,12 @@ public static MonthBudget toMonthBudget(Long monthBudget) {
                 .monthBudget(monthBudget)
                 .build();
     }
+
+    public static MonthBudgetResponseDTO.GetMonthResultDTO toGetMonthResultDTO(MonthBudget monthBudget) {
+        return MonthBudgetResponseDTO.GetMonthResultDTO.builder()
+                .monthBudget(monthBudget.getMonthBudget())
+                .usedAmount(monthBudget.getUsedAmount())
+                .createdAt(monthBudget.getCreatedAt())
+                .build();
+    }
 }

src/main/java/umc/haruchi/service/MonthBudgetService.java

@@ -114,6 +114,20 @@ public List<DayBudget> distributeDayBudgets(Long memberId) {
         return dayBudgets;
     }
 
+    public MonthBudget getMonthBudget(Long memberId) {
+        LocalDate today = LocalDate.now();
+
+        //member가 존재하는 지 확인
+        Member member = memberRepository.findById(memberId)
+                .orElseThrow(() -> new MonthBudgetHandler(ErrorStatus.NO_MEMBER_EXIST));
+
+        //member와 year, month 기반으로 해당하는 monthBudget 찾기
+        MonthBudget monthBudget = monthBudgetRepository.findByMemberIdAndYearAndMonth(memberId, today.getYear(), today.getMonthValue())
+                .orElseThrow(() -> new MonthBudgetHandler(ErrorStatus.MONTH_BUDGET_NOT_FOUND));
+
+        return monthBudget;
+    }
+
     private long roundDownToNearestHundred(long amount) {
         return (amount / 100) * 100;
     }

src/main/java/umc/haruchi/web/controller/MonthBudgetController.java

@@ -28,4 +28,12 @@ public ApiResponse<MonthBudgetResponseDTO.UpdateMonthResultDTO> updateMonthBudge
         MonthBudget monthBudget = monthBudgetService.updateMonthBudget(memberDetail.getMember().getId(), request);
         return ApiResponse.onSuccess(MonthBudgetConverter.toUpdateMonthResultDTO(monthBudget));
     }
+
+    //한달 예산 금액 조회
+    @Operation(summary = "한달 예산 금액 조회 API", description = "본인의 한달 예산 금액을 조회하는 API 입니다.")
+    @GetMapping("/")
+    public ApiResponse<MonthBudgetResponseDTO.GetMonthResultDTO> getMonthBudget(@AuthenticationPrincipal MemberDetail memberDetail) {
+        MonthBudget monthBudget = monthBudgetService.getMonthBudget(memberDetail.getMember().getId());
+        return ApiResponse.onSuccess(MonthBudgetConverter.toGetMonthResultDTO(monthBudget));
+    }
 }

src/main/java/umc/haruchi/web/dto/MonthBudgetResponseDTO.java

@@ -26,4 +26,14 @@ public static class UpdateMonthResultDTO {
         Long id;
         LocalDateTime updatedAt;
     }
+
+    @Builder
+    @Getter
+    @NoArgsConstructor
+    @AllArgsConstructor
+    public static class GetMonthResultDTO {
+        Long monthBudget;
+        Long usedAmount;
+        LocalDateTime createdAt;
+    }
 }