chore: 추천 템플릿이 중복인 경우, 그 중에서 랜덤으로 하나 선택하도록 수정 (#220)

layer-api/src/main/java/org/layer/domain/form/service/FormService.java

@@ -1,6 +1,8 @@
 package org.layer.domain.form.service;
 
 import lombok.RequiredArgsConstructor;
+
+import org.layer.domain.common.random.CustomRandom;
 import org.layer.domain.form.controller.dto.request.FormNameUpdateRequest;
 import org.layer.domain.form.controller.dto.request.RecommendFormQueryDto;
 import org.layer.domain.form.controller.dto.request.RecommendFormSetRequest;
@@ -46,6 +48,8 @@ public class FormService {
 	private final SpaceRepository spaceRepository;
 	private final TemplateMetadataRepository metadataRepository;
 
+	private final CustomRandom customRandom;
+
 	/**
 	 * 회고 폼 질문을 조회한다.
 	 *
@@ -72,7 +76,7 @@ public FormGetResponse getForm(Long formId, Long memberId) {
 	}
 
 	public RecommendFormResponseDto getRecommendTemplate(RecommendFormQueryDto queryDto) {
-		FormTag recommandFormTag = FormTag.getRecommandFormTag(queryDto.purpose());
+		FormTag recommandFormTag = FormTag.getRecommandFormTag(queryDto.purpose(), customRandom);
 
 		Form form = formRepository.findByFormTagAndFormTypeOrThrow(recommandFormTag, FormType.TEMPLATE);
 		TemplateMetadata metadata = metadataRepository.findByFormIdOrThrow(form.getId());

layer-domain/src/main/java/org/layer/domain/common/random/CustomRandom.java

@@ -0,0 +1,7 @@
+package org.layer.domain.common.random;
+
+public interface CustomRandom {
+	String generateRandomValue();
+
+	int nextInt(int index);
+}

layer-domain/src/main/java/org/layer/domain/common/random/MockRandom.java

@@ -0,0 +1,19 @@
+package org.layer.domain.common.random;
+
+import org.springframework.context.annotation.Profile;
+import org.springframework.stereotype.Component;
+
+@Component
+@Profile("test")
+public class MockRandom implements CustomRandom {
+
+	@Override
+	public String generateRandomValue() {
+		return "test-random-value";
+	}
+
+	@Override
+	public int nextInt(int index) {
+		return 1;
+	}
+}

layer-domain/src/main/java/org/layer/domain/common/random/RealRandom.java

@@ -0,0 +1,22 @@
+package org.layer.domain.common.random;
+
+import java.util.Random;
+import java.util.UUID;
+
+import org.springframework.context.annotation.Profile;
+import org.springframework.stereotype.Component;
+
+@Component
+@Profile({"local", "dev", "prod"})
+public class RealRandom implements CustomRandom {
+	@Override
+	public String generateRandomValue() {
+		return UUID.randomUUID().toString().substring(0, 13);
+	}
+
+	@Override
+	public int nextInt(int index) {
+		Random random = new Random();
+		return random.nextInt(index);
+	}
+}

layer-domain/src/main/java/org/layer/domain/form/enums/FormTag.java

@@ -1,10 +1,13 @@
 package org.layer.domain.form.enums;
 
+import java.util.Collections;
 import java.util.EnumSet;
 import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;
 
+import org.layer.domain.common.random.CustomRandom;
+
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
 
@@ -21,7 +24,7 @@ public enum FormTag {
 
 	private final String tag;
 
-	public static FormTag getRecommandFormTag(List<RetrospectPurpose> retrospectPurposes) {
+	public static FormTag getRecommandFormTag(List<RetrospectPurpose> retrospectPurposes, CustomRandom customRandom) {
 		Map<FormTag, Integer> formTagIntegerMap = EnumSet.allOf(FormTag.class).stream()
 			.collect(Collectors.toMap(tag -> tag, tag -> 0));
 
@@ -33,10 +36,14 @@ public static FormTag getRecommandFormTag(List<RetrospectPurpose> retrospectPurp
 			formTagIntegerMap.put(PMI, formTagIntegerMap.get(PMI) +purpose.getPmiPont());
 		});
 
-		return formTagIntegerMap.entrySet()
-			.stream()
-			.max(Map.Entry.comparingByValue())
+		int maxValue = Collections.max(formTagIntegerMap.values());
+
+		List<FormTag> maxTags = formTagIntegerMap.entrySet().stream()
+			.filter(entry -> entry.getValue() == maxValue)
 			.map(Map.Entry::getKey)
-			.orElse(FormTag.UNTITLED);
+			.toList();
+
+		// 최댓값을 가진 것 중 랜덤으로 하나 선택
+		return maxTags.get(customRandom.nextInt(maxTags.size()));
 	}
 }