[BE] feat: 축제 대학교 검색 기능 보완 및 정렬(#926) (#927)

* feat: 축제 검색 시 ~대 ~대학교를 붙히지 않더라도 검색 가능 및 진행, 예정, 종료 순 정렬 적용

* refactor: 아티스트 축제 조회 로직 리팩토링

* refactor: 축제 정렬 리팩토링

* refactor: 개행 및 EmptyList 반환

backend/src/main/java/com/festago/festival/application/FestivalSearchV1QueryService.java

@@ -1,11 +1,21 @@
 package com.festago.festival.application;
 
+import static com.festago.festival.repository.FestivalFilter.END;
+import static com.festago.festival.repository.FestivalFilter.PLANNED;
+import static com.festago.festival.repository.FestivalFilter.PROGRESS;
+
 import com.festago.festival.dto.FestivalSearchV1Response;
 import com.festago.festival.repository.ArtistFestivalSearchV1QueryDslRepository;
+import com.festago.festival.repository.FestivalFilter;
 import com.festago.festival.repository.SchoolFestivalSearchV1QueryDslRepository;
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.EnumMap;
 import java.util.List;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
+import java.util.Map;
+import java.util.stream.Collectors;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -15,16 +25,65 @@
 @RequiredArgsConstructor
 public class FestivalSearchV1QueryService {
 
-    private static final Pattern SCHOOL_PATTERN = Pattern.compile(".*대(학교)?$");
-
     private final ArtistFestivalSearchV1QueryDslRepository artistFestivalSearchV1QueryDslRepository;
     private final SchoolFestivalSearchV1QueryDslRepository schoolFestivalSearchV1QueryDslRepository;
 
     public List<FestivalSearchV1Response> search(String keyword) {
-        Matcher schoolMatcher = SCHOOL_PATTERN.matcher(keyword);
-        if (schoolMatcher.matches()) {
-            return schoolFestivalSearchV1QueryDslRepository.executeSearch(keyword);
+        return sortFestival(findFestivals(keyword));
+    }
+
+    private List<FestivalSearchV1Response> findFestivals(String keyword) {
+        if (artistFestivalSearchV1QueryDslRepository.existsByName(keyword)) {
+            return artistFestivalSearchV1QueryDslRepository.executeSearch(keyword);
+        }
+        return schoolFestivalSearchV1QueryDslRepository.executeSearch(keyword);
+    }
+
+    private List<FestivalSearchV1Response> sortFestival(List<FestivalSearchV1Response> festivals) {
+        Map<FestivalFilter, List<FestivalSearchV1Response>> festivalByStatus = divideByStatus(festivals);
+        List<FestivalSearchV1Response> result = new ArrayList<>();
+        for (FestivalFilter festivalFilter : determineFestivalOrder()) {
+            List<FestivalSearchV1Response> festivalsByFilter = festivalByStatus.getOrDefault(festivalFilter,
+                Collections.emptyList());
+            sortByStatus(festivalFilter, festivalsByFilter);
+            result.addAll(festivalsByFilter);
+        }
+        return result;
+    }
+
+    private Map<FestivalFilter, List<FestivalSearchV1Response>> divideByStatus(
+        List<FestivalSearchV1Response> festivals
+    ) {
+        return festivals.stream()
+            .collect(Collectors.groupingBy(
+                this::determineStatus,
+                () -> new EnumMap<>(FestivalFilter.class),
+                Collectors.toList()
+            ));
+    }
+
+    private FestivalFilter determineStatus(FestivalSearchV1Response festival) {
+        LocalDate now = LocalDate.now();
+        if (now.isAfter(festival.endDate())) {
+            return END;
+        }
+        if (now.isBefore(festival.startDate())) {
+            return PLANNED;
+        }
+        return PROGRESS;
+    }
+
+    private List<FestivalFilter> determineFestivalOrder() {
+        return List.of(PROGRESS, PLANNED, END);
+    }
+
+    private void sortByStatus(
+        FestivalFilter status,
+        List<FestivalSearchV1Response> festivals) {
+
+        switch (status) {
+            case END -> festivals.sort(Comparator.comparing(FestivalSearchV1Response::endDate).reversed());
+            case PROGRESS, PLANNED -> festivals.sort(Comparator.comparing(FestivalSearchV1Response::startDate));
         }
-        return artistFestivalSearchV1QueryDslRepository.executeSearch(keyword);
     }
 }

backend/src/main/java/com/festago/festival/repository/ArtistFestivalSearchV1QueryDslRepository.java

@@ -24,39 +24,38 @@ public ArtistFestivalSearchV1QueryDslRepository() {
     }
 
     public List<FestivalSearchV1Response> executeSearch(String keyword) {
+        return select(new QFestivalSearchV1Response(
+            festival.id,
+            festival.name,
+            festival.festivalDuration.startDate,
+            festival.festivalDuration.endDate,
+            festival.posterImageUrl,
+            festivalQueryInfo.artistInfo)
+        )
+            .from(artist)
+            .innerJoin(stageArtist).on(stageArtist.artistId.eq(artist.id))
+            .innerJoin(stage).on(stage.id.eq(stageArtist.stageId))
+            .innerJoin(festival).on(festival.id.eq(stage.festival.id))
+            .innerJoin(festivalQueryInfo).on(festival.id.eq(festivalQueryInfo.festivalId))
+            .where(getBooleanExpressionByKeyword(keyword))
+            .fetch();
+    }
+
+    private BooleanExpression getBooleanExpressionByKeyword(String keyword) {
         int keywordLength = keyword.length();
         if (keywordLength == 0) {
             throw new BadRequestException(ErrorCode.INVALID_KEYWORD);
         }
         if (keywordLength == 1) {
-            return searchByEqual(keyword);
+            return artist.name.eq(keyword);
         }
-        return searchByLike(keyword);
-    }
-
-    private List<FestivalSearchV1Response> searchByEqual(String keyword) {
-        return searchByExpression(artist.name.eq(keyword));
-    }
-
-    private List<FestivalSearchV1Response> searchByExpression(BooleanExpression expression) {
-        return select(
-            new QFestivalSearchV1Response(
-                festival.id,
-                festival.name,
-                festival.festivalDuration.startDate,
-                festival.festivalDuration.endDate,
-                festival.posterImageUrl,
-                festivalQueryInfo.artistInfo))
-            .from(artist)
-            .innerJoin(stageArtist).on(expression.and(stageArtist.artistId.eq(artist.id)))
-            .innerJoin(stage).on(stage.id.eq(stageArtist.stageId))
-            .innerJoin(festival).on(festival.id.eq(stage.festival.id))
-            .innerJoin(festivalQueryInfo).on(festival.id.eq(festivalQueryInfo.festivalId))
-            .where(expression)
-            .fetch();
+        return artist.name.contains(keyword);
     }
 
-    private List<FestivalSearchV1Response> searchByLike(String keyword) {
-        return searchByExpression(artist.name.contains(keyword));
+    public boolean existsByName(String keyword) {
+        return !selectFrom(artist)
+            .where(getBooleanExpressionByKeyword(keyword))
+            .fetch()
+            .isEmpty();
     }
 }