feat: 크루 리더 위임 기능 추가

src/main/java/com/retrip/crew/application/in/CrewService.java

@@ -3,26 +3,17 @@
 import com.retrip.crew.application.in.request.IntroductionCreateRequest;
 import com.retrip.crew.application.in.request.IntroductionDeleteRequest;
 import com.retrip.crew.application.in.request.IntroductionUpdateRequest;
-import com.retrip.crew.application.in.request.crew.CrewCreateRequest;
-import com.retrip.crew.application.in.request.crew.CrewOrder;
-import com.retrip.crew.application.in.request.crew.CrewUpdateRequest;
-import com.retrip.crew.application.in.request.crew.CrewWithdrawalRequest;
+import com.retrip.crew.application.in.request.crew.*;
 import com.retrip.crew.application.in.response.IntroductionCreateResponse;
 import com.retrip.crew.application.in.response.IntroductionDetailResponse;
 import com.retrip.crew.application.in.response.IntroductionListResponse;
 import com.retrip.crew.application.in.response.IntroductionUpdateResponse;
-import com.retrip.crew.application.in.response.crew.CrewCreateResponse;
-import com.retrip.crew.application.in.response.crew.CrewDetailResponse;
-import com.retrip.crew.application.in.response.crew.CrewListResponse;
-import com.retrip.crew.application.in.response.crew.CrewUpdateResponse;
+import com.retrip.crew.application.in.response.crew.*;
 import com.retrip.crew.application.in.usecase.GetCrewUseCase;
 import com.retrip.crew.application.in.usecase.ManageCrewUseCase;
 import com.retrip.crew.application.in.usecase.ManageIntroductionUseCase;
 import com.retrip.crew.application.out.repository.*;
-import com.retrip.crew.domain.entity.Crew;
-import com.retrip.crew.domain.entity.CrewMembers;
-import com.retrip.crew.domain.entity.Introduction;
-import com.retrip.crew.domain.entity.Recruitment;
+import com.retrip.crew.domain.entity.*;
 import com.retrip.crew.domain.exception.CrewNotFoundException;
 import com.retrip.crew.domain.exception.IntroductionNotFoundException;
 import com.retrip.crew.domain.vo.CrewDescription;
@@ -145,4 +136,12 @@ public void withdrawCrew(UUID crewId, CrewWithdrawalRequest request) {
         CrewMembers crewMembers = crew.getCrewMembers();
         crewMembers.withdraw(request.memberId(), request.participatingCrewTrips());
     }
+
+    @Override
+    public CrewLeaderDelegateResponse delegateCrewLeader(UUID crewId, CrewLeaderDelegateRequest request) {
+        Crew crew = findCrewById(crewId);
+        CrewMembers crewMembers = crew.getCrewMembers();
+        CrewMember newLeader = crewMembers.delegateLeader(request.leaderId(), request.newLeaderId());
+        return CrewLeaderDelegateResponse.of(newLeader);
+    }
 }

src/main/java/com/retrip/crew/application/in/request/crew/CrewLeaderDelegateRequest.java

@@ -0,0 +1,15 @@
+package com.retrip.crew.application.in.request.crew;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+
+import java.util.UUID;
+
+@Schema(description = "크루 리더 위임 Request")
+public record CrewLeaderDelegateRequest(
+        @Schema(description = "리더 ID")
+        UUID leaderId,
+
+        @Schema(description = "위임 리더 ID")
+        UUID newLeaderId
+) {
+}

src/main/java/com/retrip/crew/application/in/response/crew/CrewLeaderDelegateResponse.java

@@ -0,0 +1,26 @@
+package com.retrip.crew.application.in.response.crew;
+
+import com.retrip.crew.domain.entity.CrewMember;
+import io.swagger.v3.oas.annotations.media.Schema;
+
+import java.util.UUID;
+
+@Schema(description = "크루 리더 위임 Response")
+public record CrewLeaderDelegateResponse(
+        @Schema(description = "리더 ID")
+        UUID leaderId,
+
+        @Schema(description = "크루원 역할 코드")
+        String roleCode,
+
+        @Schema(description = "크루원 역할명")
+        String roleName
+) {
+    public static CrewLeaderDelegateResponse of(CrewMember newLeader) {
+        return new CrewLeaderDelegateResponse(
+                newLeader.getMemberId(),
+                newLeader.getCrewMemberRole().getCode(),
+                newLeader.getCrewMemberRole().getViewName()
+        );
+    }
+}

src/main/java/com/retrip/crew/application/in/usecase/ManageCrewUseCase.java

@@ -1,9 +1,11 @@
 package com.retrip.crew.application.in.usecase;
 
 import com.retrip.crew.application.in.request.crew.CrewCreateRequest;
+import com.retrip.crew.application.in.request.crew.CrewLeaderDelegateRequest;
 import com.retrip.crew.application.in.request.crew.CrewUpdateRequest;
 import com.retrip.crew.application.in.request.crew.CrewWithdrawalRequest;
 import com.retrip.crew.application.in.response.crew.CrewCreateResponse;
+import com.retrip.crew.application.in.response.crew.CrewLeaderDelegateResponse;
 import com.retrip.crew.application.in.response.crew.CrewUpdateResponse;
 
 import java.util.UUID;
@@ -14,4 +16,6 @@ public interface ManageCrewUseCase {
     CrewUpdateResponse updateCrew(UUID crewId, CrewUpdateRequest request);
 
     void withdrawCrew(UUID crewId, CrewWithdrawalRequest request);
+
+    CrewLeaderDelegateResponse delegateCrewLeader(UUID crewId, CrewLeaderDelegateRequest request);
 }

src/main/java/com/retrip/crew/domain/entity/CrewMember.java

@@ -40,4 +40,8 @@ public CrewMember(Crew crew, UUID memberId, CrewMemberRole crewMemberRole) {
     public boolean isLeader() {
         return CrewMemberRole.isLeaderRole(this.crewMemberRole);
     }
+
+    public void changeRole(CrewMemberRole role) {
+        this.crewMemberRole = role;
+    }
 }

src/main/java/com/retrip/crew/domain/entity/CrewMembers.java

@@ -2,6 +2,7 @@
 
 import com.retrip.crew.domain.CrewTrip;
 import com.retrip.crew.domain.exception.ImpossibleWithdrawCrewException;
+import com.retrip.crew.domain.exception.NotCrewLeaderException;
 import com.retrip.crew.domain.exception.common.IllegalStateException;
 import com.retrip.crew.domain.exception.common.InvalidValueException;
 import jakarta.persistence.CascadeType;
@@ -33,9 +34,9 @@ private CrewMember createLeader(Crew crew, UUID memberId) {
 
     public CrewMember getLeader() {
         return this.values.stream()
-                .filter(it -> it.getCrewMemberRole() == CrewMemberRole.LEADER)
+                .filter(CrewMember::isLeader)
                 .findFirst()
-                .orElse(null);
+                .orElseThrow(() -> new InvalidValueException("크루 리더를 찾을 수 없습니다."));
     }
 
     public int getSize() {
@@ -90,4 +91,20 @@ private CrewMember findMember(UUID memberId) {
                 .findFirst()
                 .orElseThrow(() -> new InvalidValueException("크루 멤버가 아닙니다."));
     }
+
+    public CrewMember delegateLeader(UUID leaderId, UUID newLeaderId) {
+        CrewMember leader = findMember(leaderId);
+        CrewMember newLeader = findMember(newLeaderId);
+        validatePossibleDelegate(leader);
+
+        leader.changeRole(CrewMemberRole.PARTICIPANT);
+        newLeader.changeRole(CrewMemberRole.LEADER);
+        return newLeader;
+    }
+
+    private void validatePossibleDelegate(CrewMember leader) {
+        if (!leader.isLeader()) {
+            throw new NotCrewLeaderException();
+        }
+    }
 }

src/main/java/com/retrip/crew/infra/adapter/in/presentation/rest/CrewController.java

@@ -3,18 +3,12 @@
 import com.retrip.crew.application.in.request.IntroductionCreateRequest;
 import com.retrip.crew.application.in.request.IntroductionDeleteRequest;
 import com.retrip.crew.application.in.request.IntroductionUpdateRequest;
-import com.retrip.crew.application.in.request.crew.CrewCreateRequest;
-import com.retrip.crew.application.in.request.crew.CrewOrder;
-import com.retrip.crew.application.in.request.crew.CrewUpdateRequest;
-import com.retrip.crew.application.in.request.crew.CrewWithdrawalRequest;
+import com.retrip.crew.application.in.request.crew.*;
 import com.retrip.crew.application.in.response.IntroductionCreateResponse;
 import com.retrip.crew.application.in.response.IntroductionDetailResponse;
 import com.retrip.crew.application.in.response.IntroductionListResponse;
 import com.retrip.crew.application.in.response.IntroductionUpdateResponse;
-import com.retrip.crew.application.in.response.crew.CrewCreateResponse;
-import com.retrip.crew.application.in.response.crew.CrewDetailResponse;
-import com.retrip.crew.application.in.response.crew.CrewListResponse;
-import com.retrip.crew.application.in.response.crew.CrewUpdateResponse;
+import com.retrip.crew.application.in.response.crew.*;
 import com.retrip.crew.application.in.usecase.GetCrewUseCase;
 import com.retrip.crew.application.in.usecase.ManageCrewUseCase;
 import com.retrip.crew.application.in.usecase.ManageIntroductionUseCase;
@@ -96,12 +90,12 @@ public ApiResponse<IntroductionUpdateResponse> updateIntroduction(
 
     @Schema(description = "크루 자기소개 삭제")
     @DeleteMapping("/{crewId}/introductions/{introductionId}")
-    public ApiResponse<IntroductionCreateResponse> deleteIntroduction(
+    public ApiResponse<Void> deleteIntroduction(
             @PathVariable("crewId") final UUID crewId,
             @PathVariable("introductionId") final UUID introductionId,
             @RequestBody IntroductionDeleteRequest request) {
         manageIntroductionUseCase.deleteIntroduction(crewId, introductionId, request);
-        return ApiResponse.created(null);
+        return ApiResponse.noContent();
     }
 
     @Schema(description = "크루 자기소개 상세 조회")
@@ -132,4 +126,13 @@ public ApiResponse<Void> withdrawCrew(
         manageCrewUseCase.withdrawCrew(crewId, request);
         return ApiResponse.noContent();
     }
+
+    @Schema(description = "크루 리더 위임")
+    @PutMapping("/{crewId}/members/delegate")
+    public ApiResponse<CrewLeaderDelegateResponse> delegateCrewLeader(
+            @PathVariable final UUID crewId,
+            @RequestBody CrewLeaderDelegateRequest request) {
+        CrewLeaderDelegateResponse response = manageCrewUseCase.delegateCrewLeader(crewId, request);
+        return ApiResponse.ok(response);
+    }
 }

src/test/java/com/retrip/crew/domain/entity/CrewMembersTest.java

@@ -134,4 +134,19 @@ class CrewMembersTest {
         // then
         assertThat(crewMembers.getValues().contains(member)).isFalse();
     }
+
+    @Test
+    void 크루_리더를_위임한다() {
+        // given
+        Crew crew = createCrewWithMembers(LEADER_ID);
+        CrewMember leader = crew.getCrewMembers().getLeader();
+
+        // when
+        CrewMember newLeader = crew.getCrewMembers().delegateLeader(LEADER_ID, 홍석_ID);
+
+        // then
+        assertThat(newLeader.getMemberId()).isEqualTo(홍석_ID);
+        assertThat(newLeader.getCrewMemberRole()).isEqualTo(CrewMemberRole.LEADER);
+        assertThat(leader.getCrewMemberRole()).isEqualTo(CrewMemberRole.PARTICIPANT);
+    }
 }