feat: RankingPageInfo 클래스 추가 및 페이지 정보 처리 유틸리티 구현

Author: rnqhstmd

apps/commerce-api/src/main/java/com/loopers/application/ranking/RankingPageInfo.java

@@ -0,0 +1,30 @@
+package com.loopers.application.ranking;
+
+import com.loopers.domain.ranking.RankingInfo;
+
+import java.time.LocalDate;
+import java.util.List;
+
+public record RankingPageInfo(
+        List<RankingInfo> rankings,
+        LocalDate date,
+        int page,
+        int size,
+        Long totalCount,
+        int totalPages
+) {
+    public static RankingPageInfo of(
+            List<RankingInfo> rankings,
+            LocalDate date,
+            int page,
+            int size,
+            Long totalCount
+    ) {
+        int totalPages = (int) Math.ceil((double) totalCount / size);
+        return new RankingPageInfo(rankings, date, page, size, totalCount, totalPages);
+    }
+
+    public static RankingPageInfo empty(LocalDate date, int page, int size) {
+        return new RankingPageInfo(List.of(), date, page, size, 0L, 0);
+    }
+}