[Feature] 스와이프 카드 수업날짜 응답 구현 (#121)

Author: Jangwon0319

src/main/java/com/danthis/backend/application/danceclass/response/DanceClassListServiceResponse.java

@@ -2,9 +2,13 @@
 
 import com.danthis.backend.domain.danceclass.DanceClass;
 import com.danthis.backend.domain.danceclass.danceclassimage.DanceClassImage;
+import com.danthis.backend.domain.danceclass.danceclassschedule.DanceClassSchedule;
+import com.danthis.backend.domain.danceclass.danceclassschedule.Week;
+import java.time.format.DateTimeFormatter;
 import java.util.Comparator;
 import java.util.List;
 import java.util.Set;
+import java.util.stream.Collectors;
 import lombok.Builder;
 import lombok.Getter;
 import org.springframework.data.domain.Page;
@@ -28,6 +32,8 @@ public static class DanceClassSummary {
     private String thumbnailImage;
     private String genre;
     private Set<Long> hashtagIds;
+    private Set<String> days;
+    private Set<String> dates;
   }
 
   public static DanceClassListServiceResponse from(Page<DanceClass> danceClassPage) {
@@ -43,6 +49,8 @@ public static DanceClassListServiceResponse from(Page<DanceClass> danceClassPage
                                                                                                         .thumbnailImage(getFixedThumbnailImage(danceClass))
                                                                                                         .genre(danceClass.getGenre().getName())
                                                                                                         .hashtagIds(danceClass.getHashtagIds())
+                                                                                                        .days(extractDays(danceClass))
+                                                                                                        .dates(extractDates(danceClass))
                                                                                                         .build())
                                                                     .toList())
                                         .build();
@@ -61,6 +69,8 @@ public static DanceClassListServiceResponse from(List<DanceClass> danceClasses)
                                                                                                       .thumbnailImage(getFixedThumbnailImage(danceClass))
                                                                                                       .genre(danceClass.getGenre().getName())
                                                                                                       .hashtagIds(danceClass.getHashtagIds())
+                                                                                                      .days(extractDays(danceClass))
+                                                                                                      .dates(extractDates(danceClass))
                                                                                                       .build())
                                                                   .toList())
                                         .build();
@@ -73,4 +83,29 @@ private static String getFixedThumbnailImage(DanceClass danceClass) {
                      .findFirst()
                      .orElse(null);
   }
+
+  private static Set<String> extractDays(DanceClass danceClass) {
+    if (danceClass.getDanceClassSchedules() == null) {
+      return Set.of();
+    }
+
+    return danceClass.getDanceClassSchedules().stream()
+                      .map(DanceClassSchedule::getDay)
+                      .filter(day -> day != null)
+                      .map(Week::name)
+                      .collect(Collectors.toSet());
+  }
+
+  private static Set<String> extractDates(DanceClass danceClass) {
+    if (danceClass.getDanceClassSchedules() == null) {
+      return Set.of();
+    }
+
+    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
+    return danceClass.getDanceClassSchedules().stream()
+                     .map(DanceClassSchedule::getDate)
+                     .filter(date -> date != null)
+                     .map(date -> date.format(formatter))
+                     .collect(Collectors.toSet());
+  }
 }