[Feat/#80] 전월 대비 손익현황 비교 API 구현

Central-MakeUs · Feb 5, 2024 · 9605250 · 9605250
1 parent fef5576
commit 9605250
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diff --git a/src/main/java/com/friends/easybud/financial/dto/FinancialResponse.java b/src/main/java/com/friends/easybud/financial/dto/FinancialResponse.java
@@ -88,6 +88,12 @@ public static class IncomeStatementDto {
         @Schema(description = "비용 백분율", example = "20")
         private BigDecimal expensePercentage;
 
+        @Schema(description = "전월 대비 수익 변화율", example = "88")
+        private BigDecimal revenueChangePercentage;
+
+        @Schema(description = "전월 대비 비용 변화율", example = "-12")
+        private BigDecimal expenseChangePercentage;
+
     }
 
     @Builder

diff --git a/src/main/java/com/friends/easybud/financial/service/FinancialServiceImpl.java b/src/main/java/com/friends/easybud/financial/service/FinancialServiceImpl.java
@@ -119,6 +119,15 @@ public IncomeStatementDto getIncomeStatement(LocalDateTime startDate, LocalDateT
         BigDecimal revenue = getSumOfRevenueAccounts(memberId, startDate, endDate);
         BigDecimal expense = getSumOfExpenseAccounts(memberId, startDate, endDate);
 
+        LocalDateTime lastMonthStart = startDate.minusMonths(1).withDayOfMonth(1);
+        LocalDateTime lastMonthEnd = lastMonthStart.plusMonths(1).minusDays(1);
+
+        BigDecimal lastMonthRevenue = getSumOfRevenueAccounts(memberId, lastMonthStart, lastMonthEnd);
+        BigDecimal lastMonthExpense = getSumOfExpenseAccounts(memberId, lastMonthStart, lastMonthEnd);
+
+        BigDecimal revenueChangePercentage = calculateChangePercentage(revenue, lastMonthRevenue);
+        BigDecimal expenseChangePercentage = calculateChangePercentage(expense, lastMonthExpense);
+
         BigDecimal expensePercentage = BigDecimal.ZERO;
         BigDecimal revenuePercentage = BigDecimal.ZERO;
 
@@ -136,9 +145,20 @@ public IncomeStatementDto getIncomeStatement(LocalDateTime startDate, LocalDateT
                 .expense(expense)
                 .expensePercentage(expensePercentage)
                 .revenuePercentage(revenuePercentage)
+                .expenseChangePercentage(expenseChangePercentage)
+                .revenueChangePercentage(revenueChangePercentage)
                 .build();
     }
 
+    private BigDecimal calculateChangePercentage(BigDecimal current, BigDecimal previous) {
+        if (previous.compareTo(BigDecimal.ZERO) == 0) {
+            return BigDecimal.ZERO; // 이전 값이 0이면 변화율을 계산할 수 없음
+        }
+        return current.subtract(previous)
+                .divide(previous, 4, RoundingMode.HALF_UP)
+                .multiply(new BigDecimal(100));
+    }
+
     @Override
     public IncomeStatementSummaryDto getIncomeStatementSummary(LocalDateTime startDate, LocalDateTime endDate) {
         Long memberId = 1L;