feat: 유저 팔로잉/팔로워 목록 조회 API (#274)

* feat: 유저 팔로잉/팔로워 목록 조회 API * style: spotless * refactor: 메소드 추출 * style: spotless
depromeet · Feb 5, 2024 · 232871f · 232871f
1 parent 805bceb
commit 232871f
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Showing 3 changed files with 100 additions and 4 deletions.
diff --git a/src/main/java/com/depromeet/domain/follow/api/FollowController.java b/src/main/java/com/depromeet/domain/follow/api/FollowController.java
@@ -5,6 +5,7 @@
 import com.depromeet.domain.follow.dto.request.FollowDeleteRequest;
 import com.depromeet.domain.follow.dto.response.FollowFindMeInfoResponse;
 import com.depromeet.domain.follow.dto.response.FollowFindTargetInfoResponse;
+import com.depromeet.domain.follow.dto.response.FollowListResponse;
 import com.depromeet.domain.follow.dto.response.MemberFollowedResponse;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.tags.Tag;
@@ -56,4 +57,11 @@ public FollowFindMeInfoResponse followFindMe() {
     public List<MemberFollowedResponse> followedUserFindAll() {
         return followService.findAllFollowedMember();
     }
+
+    // 팔로잉, 팔로워 리스트 응답
+    @GetMapping("/{targetId}/list")
+    @Operation(summary = "팔로잉, 팔로워 유저 리스트를 반환합니다", description = "팔로잉, 팔로워 유저들을 반환합니다.")
+    public FollowListResponse followList(@PathVariable Long targetId) {
+        return followService.findFollowList(targetId);
+    }
 }
diff --git a/src/main/java/com/depromeet/domain/follow/application/FollowService.java b/src/main/java/com/depromeet/domain/follow/application/FollowService.java
@@ -4,12 +4,10 @@
 import com.depromeet.domain.follow.domain.MemberRelation;
 import com.depromeet.domain.follow.dto.request.FollowCreateRequest;
 import com.depromeet.domain.follow.dto.request.FollowDeleteRequest;
-import com.depromeet.domain.follow.dto.response.FollowFindMeInfoResponse;
-import com.depromeet.domain.follow.dto.response.FollowFindTargetInfoResponse;
-import com.depromeet.domain.follow.dto.response.FollowStatus;
-import com.depromeet.domain.follow.dto.response.MemberFollowedResponse;
+import com.depromeet.domain.follow.dto.response.*;
 import com.depromeet.domain.member.dao.MemberRepository;
 import com.depromeet.domain.member.domain.Member;
+import com.depromeet.domain.member.dto.response.MemberSearchResponse;
 import com.depromeet.domain.mission.domain.Mission;
 import com.depromeet.domain.missionRecord.domain.ImageUploadStatus;
 import com.depromeet.domain.missionRecord.domain.MissionRecord;
@@ -188,4 +186,78 @@ private Member getTargetMember(Long targetId) {
                                                 ErrorCode.FOLLOW_TARGET_MEMBER_NOT_FOUND));
         return targetMember;
     }
+
+    public FollowListResponse findFollowList(Long targetId) {
+        final Member currentMember = memberUtil.getCurrentMember();
+        Member targetMember = getTargetMember(targetId);
+
+        List<MemberSearchResponse> followingList = new ArrayList<>();
+        List<MemberSearchResponse> followerList = new ArrayList<>();
+
+        List<MemberRelation> targetMemberSources =
+                memberRelationRepository.findAllBySourceId(targetMember.getId());
+        List<MemberRelation> targetMemberTargets =
+                memberRelationRepository.findAllByTargetId(targetMember.getId());
+
+        List<MemberRelation> currentMemberSources =
+                memberRelationRepository.findAllBySourceId(currentMember.getId());
+        List<MemberRelation> currentMemberTargets =
+                memberRelationRepository.findAllByTargetId(currentMember.getId());
+
+        // target 유저의 팔로잉
+        List<Member> followingMembers =
+                targetMemberSources.stream().map(MemberRelation::getTarget).toList();
+
+        // target 유저의 팔로워
+        List<Member> followerMembers =
+                targetMemberTargets.stream().map(MemberRelation::getSource).toList();
+
+        // 팔로잉 리스트 구하기
+        getFollowStatusIncludeList(
+                followingMembers, currentMemberSources, followingList, currentMemberTargets);
+
+        // 팔로워 리스트 구하기
+        getFollowStatusIncludeList(
+                followerMembers, currentMemberSources, followerList, currentMemberTargets);
+
+        return FollowListResponse.of(
+                targetMember.getProfile().getNickname(), followingList, followerList);
+    }
+
+    private static void getFollowStatusIncludeList(
+            List<Member> targetMembers,
+            List<MemberRelation> currentMemberSources,
+            List<MemberSearchResponse> resultList,
+            List<MemberRelation> currentMemberTargets) {
+        for (Member member : targetMembers) {
+            boolean existRelation = false;
+            for (MemberRelation memberRelation : currentMemberSources) {
+                if (member.getId().equals(memberRelation.getTarget().getId())) {
+                    existRelation = true;
+                    break;
+                }
+            }
+
+            if (existRelation) { // 조회 된 애들 중 내가 팔로우한 애라면
+                resultList.add(MemberSearchResponse.toFollowingResponse(member));
+                continue;
+            }
+
+            // 내가 팔로우를 하지 않았을 때
+            Optional<MemberRelation> optionalMemberRelation =
+                    currentMemberTargets.stream()
+                            .filter(
+                                    memberRelation ->
+                                            member.getId()
+                                                    .equals(memberRelation.getSource().getId()))
+                            .findFirst();
+            if (optionalMemberRelation.isPresent()) { // 상대방만 나를 팔로우 하고 있을  때
+                resultList.add(MemberSearchResponse.toFollowedByMeResponse(member));
+                continue;
+            }
+
+            // 아니라면 서로 팔로우가 아닌 상태
+            resultList.add(MemberSearchResponse.toNotFollowingResponse(member));
+        }
+    }
 }
diff --git a/src/main/java/com/depromeet/domain/follow/dto/response/FollowListResponse.java b/src/main/java/com/depromeet/domain/follow/dto/response/FollowListResponse.java
@@ -0,0 +1,16 @@
+package com.depromeet.domain.follow.dto.response;
+
+import com.depromeet.domain.member.dto.response.MemberSearchResponse;
+import java.util.List;
+
+public record FollowListResponse(
+        String targetNickname,
+        List<MemberSearchResponse> followingList,
+        List<MemberSearchResponse> followerList) {
+    public static FollowListResponse of(
+            String targetNickname,
+            List<MemberSearchResponse> followingList,
+            List<MemberSearchResponse> followerList) {
+        return new FollowListResponse(targetNickname, followingList, followerList);
+    }
+}