[BE] 행사 참여 인원 또는 지출 총액 변동시 차등 정산 초기화 기능 구현

server/src/main/java/server/haengdong/application/BillActionService.java

@@ -9,6 +9,8 @@
 import server.haengdong.domain.action.Action;
 import server.haengdong.domain.action.ActionRepository;
 import server.haengdong.domain.action.BillAction;
+import server.haengdong.domain.action.BillActionDetail;
+import server.haengdong.domain.action.BillActionDetailRepository;
 import server.haengdong.domain.action.BillActionRepository;
 import server.haengdong.domain.event.Event;
 import server.haengdong.domain.event.EventRepository;
@@ -23,6 +25,7 @@ public class BillActionService {
     private final BillActionRepository billActionRepository;
     private final ActionRepository actionRepository;
     private final EventRepository eventRepository;
+    private final BillActionDetailRepository billActionDetailRepository;
 
     @Transactional
     public void saveAllBillAction(String eventToken, List<BillActionAppRequest> requests) {
@@ -49,10 +52,23 @@ public void updateBillAction(String token, Long actionId, BillActionUpdateAppReq
 
         validateToken(token, billAction);
 
+        resetBillActionDetail(billAction, request.price());
+
         BillAction updatedBillAction = billAction.update(request.title(), request.price());
         billActionRepository.save(updatedBillAction);
     }
 
+    private void resetBillActionDetail(BillAction billAction, Long updatePrice) {
+        if (billAction.getPrice() != updatePrice) {
+            List<BillActionDetail> billActionDetails = billActionDetailRepository.findByBillAction(billAction);
+            int memberCount = billActionDetails.size();
+            if (memberCount != 0) {
+                Long eachPrice = updatePrice / memberCount;
+                billActionDetails.forEach(billActionDetail -> billActionDetail.updatePrice(eachPrice));
+            }
+        }
+    }
+
     private void validateToken(String token, BillAction billAction) {
         Event event = billAction.getEvent();
         if (event.isTokenMismatch(token)) {

server/src/main/java/server/haengdong/application/MemberActionService.java

@@ -1,13 +1,18 @@
 package server.haengdong.application;
 
 import java.util.List;
+import java.util.Set;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import server.haengdong.application.request.MemberActionsSaveAppRequest;
 import server.haengdong.application.response.CurrentMemberAppResponse;
 import server.haengdong.domain.action.Action;
 import server.haengdong.domain.action.ActionRepository;
+import server.haengdong.domain.action.BillAction;
+import server.haengdong.domain.action.BillActionDetail;
+import server.haengdong.domain.action.BillActionDetailRepository;
+import server.haengdong.domain.action.BillActionRepository;
 import server.haengdong.domain.action.CurrentMembers;
 import server.haengdong.domain.action.MemberAction;
 import server.haengdong.domain.action.MemberActionRepository;
@@ -25,6 +30,8 @@ public class MemberActionService {
     private final MemberActionRepository memberActionRepository;
     private final EventRepository eventRepository;
     private final ActionRepository actionRepository;
+    private final BillActionDetailRepository billActionDetailRepository;
+    private final BillActionRepository billActionRepository;
 
     @Transactional
     public void saveMemberAction(String token, MemberActionsSaveAppRequest request) {
@@ -65,6 +72,9 @@ public void deleteMember(String token, String memberName) {
                 .orElseThrow(() -> new HaengdongException(HaengdongErrorCode.EVENT_NOT_FOUND));
 
         memberActionRepository.deleteAllByEventAndMemberName(event, memberName);
+
+        List<BillAction> billActions = billActionRepository.findByAction_Event(event);
+        billActions.forEach(billAction -> resetBillAction(event, billAction));
     }
 
     @Transactional
@@ -76,7 +86,26 @@ public void deleteMemberAction(String token, Long actionId) {
         MemberAction memberAction = memberActionRepository.findByAction(action)
                 .orElseThrow(() -> new HaengdongException(HaengdongErrorCode.MEMBER_ACTION_NOT_FOUND));
 
-        memberActionRepository.deleteAllByMemberNameAndMinSequence(memberAction.getMemberName(),
-                memberAction.getSequence());
+        memberActionRepository.deleteAllByMemberNameAndMinSequence(memberAction.getMemberName(), memberAction.getSequence());
+
+        List<BillAction> billActions = billActionRepository.findByGreaterThanSequence(action.getSequence());
+        billActions.forEach(billAction -> resetBillAction(event, billAction));
+    }
+
+    private void resetBillAction(Event event, BillAction billAction) {
+        List<MemberAction> memberActions = memberActionRepository.findByEventAndSequence(event, billAction.getSequence());
+        CurrentMembers currentMembers = CurrentMembers.of(memberActions);
+        Set<String> members = currentMembers.getMembers();
+
+        billActionDetailRepository.deleteAllByBillAction(billAction);
+
+        int memberCount = members.size();
+        if (memberCount != 0) {
+            Long eachPrice = billAction.getPrice() / memberCount;
+            for (String member : members) {
+                BillActionDetail billActionDetail = new BillActionDetail(billAction, member, eachPrice);
+                billActionDetailRepository.save(billActionDetail);
+            }
+        }
     }
 }

server/src/main/java/server/haengdong/domain/action/BillActionDetail.java

@@ -25,4 +25,14 @@ public class BillActionDetail {
     private String memberName;
 
     private Long price;
+
+    public BillActionDetail(BillAction billAction, String memberName, Long price) {
+        this.billAction = billAction;
+        this.memberName = memberName;
+        this.price = price;
+    }
+
+    public void updatePrice(Long price) {
+        this.price = price;
+    }
 }

server/src/main/java/server/haengdong/domain/action/BillActionDetailRepository.java

@@ -1,8 +1,13 @@
 package server.haengdong.domain.action;
 
+import java.util.List;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.stereotype.Repository;
 
 @Repository
 public interface BillActionDetailRepository extends JpaRepository<BillActionDetail, Long> {
+
+    List<BillActionDetail> findByBillAction(BillAction billAction);
+
+    void deleteAllByBillAction(BillAction billAction);
 }

server/src/main/java/server/haengdong/domain/action/BillActionRepository.java

@@ -4,6 +4,7 @@
 import java.util.Optional;
 import org.springframework.data.jpa.repository.EntityGraph;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
 import org.springframework.stereotype.Repository;
 import server.haengdong.domain.event.Event;
 
@@ -16,4 +17,11 @@ public interface BillActionRepository extends JpaRepository<BillAction, Long> {
     void deleteByAction_EventAndActionId(Event event, Long actionId);
 
     Optional<BillAction> findByAction_Id(Long actionId);
+
+    @Query("""
+                select ba
+                from BillAction ba
+                where ba.action.sequence > :sequence
+            """)
+    List<BillAction> findByGreaterThanSequence(Long sequence);
 }

server/src/main/java/server/haengdong/domain/action/MemberActionRepository.java

@@ -43,4 +43,11 @@ public interface MemberActionRepository extends JpaRepository<MemberAction, Long
     List<MemberAction> findAllByAction_EventAndMemberName(Event event, String memberName);
 
     boolean existsByAction_EventAndMemberName(Event event, String updatedMemberName);
+
+    @Query("""
+            select ma
+            from MemberAction ma
+            where ma.action.event = :event and ma.action.sequence < :sequence
+            """)
+    List<MemberAction> findByEventAndSequence(Event event, Long sequence);
 }

server/src/test/java/server/haengdong/application/BillActionServiceTest.java

@@ -13,6 +13,8 @@
 import server.haengdong.application.request.BillActionUpdateAppRequest;
 import server.haengdong.domain.action.Action;
 import server.haengdong.domain.action.BillAction;
+import server.haengdong.domain.action.BillActionDetail;
+import server.haengdong.domain.action.BillActionDetailRepository;
 import server.haengdong.domain.action.BillActionRepository;
 import server.haengdong.domain.event.Event;
 import server.haengdong.domain.event.EventRepository;
@@ -30,6 +32,9 @@ class BillActionServiceTest extends ServiceTestSupport {
     @Autowired
     private BillActionRepository billActionRepository;
 
+    @Autowired
+    private BillActionDetailRepository billActionDetailRepository;
+
     @DisplayName("지출 내역을 생성한다.")
     @Test
     void saveAllBillAction() {
@@ -107,6 +112,39 @@ void updateBillAction1() {
                 .isInstanceOf(HaengdongException.class);
     }
 
+    @DisplayName("지출 내역 금액을 변경하면 지출 디테일이 초기화 된다.")
+    @Test
+    void updateBillAction2() {
+        Event event = Fixture.EVENT1;
+        Event savedEvent = eventRepository.save(event);
+        Action action = Action.createFirst(savedEvent);
+        BillAction billAction = new BillAction(action, "뽕족", 10_000L);
+        BillAction savedBillAction = billActionRepository.save(billAction);
+        BillActionDetail billActionDetail1 = new BillActionDetail(savedBillAction, "감자", 3000L);
+        BillActionDetail billActionDetail2 = new BillActionDetail(savedBillAction, "고구마", 2000L);
+        BillActionDetail billActionDetail3 = new BillActionDetail(savedBillAction, "당근", 3000L);
+        BillActionDetail billActionDetail4 = new BillActionDetail(savedBillAction, "양파", 2000L);
+
+        billActionDetailRepository.saveAll(List.of(billActionDetail1, billActionDetail2, billActionDetail3, billActionDetail4));
+
+        Long actionId = savedBillAction.getAction().getId();
+        BillActionUpdateAppRequest request = new BillActionUpdateAppRequest("인생맥주", 20_000L);
+
+        billActionService.updateBillAction(event.getToken(), actionId, request);
+
+        BillAction updatedBillAction = billActionRepository.findById(savedBillAction.getId()).get();
+        List<BillActionDetail> billActionDetails = billActionDetailRepository.findByBillAction(updatedBillAction);
+
+        assertThat(billActionDetails).hasSize(4)
+                .extracting("memberName", "price")
+                .containsExactlyInAnyOrder(
+                        tuple("감자", 5000L),
+                        tuple("고구마", 5000L),
+                        tuple("당근", 5000L),
+                        tuple("양파", 5000L)
+                );
+    }
+
     @DisplayName("지출 내역을 삭제한다.")
     @Test
     void deleteBillAction() {

server/src/test/java/server/haengdong/application/MemberActionServiceTest.java

@@ -14,6 +14,10 @@
 import server.haengdong.application.request.MemberActionSaveAppRequest;
 import server.haengdong.application.request.MemberActionsSaveAppRequest;
 import server.haengdong.domain.action.Action;
+import server.haengdong.domain.action.BillAction;
+import server.haengdong.domain.action.BillActionDetail;
+import server.haengdong.domain.action.BillActionDetailRepository;
+import server.haengdong.domain.action.BillActionRepository;
 import server.haengdong.domain.action.MemberAction;
 import server.haengdong.domain.action.MemberActionRepository;
 import server.haengdong.domain.action.MemberActionStatus;
@@ -33,6 +37,12 @@ class MemberActionServiceTest extends ServiceTestSupport {
     @Autowired
     private EventRepository eventRepository;
 
+    @Autowired
+    private BillActionRepository billActionRepository;
+
+    @Autowired
+    private BillActionDetailRepository billActionDetailRepository;
+
     @DisplayName("현재 행사에 참여하고 있는 경우에 나갈 수 있다.")
     @Test
     void saveMemberActionTest() {
@@ -115,6 +125,44 @@ void deleteMember() {
                 );
     }
 
+    @DisplayName("이벤트에 속한 멤버을 삭제하면 전체 지출 내역 디테일이 초기화된다.")
+    @Test
+    void deleteMember1() {
+        Event event = Fixture.EVENT1;
+        eventRepository.save(event);
+        MemberAction memberAction1 = createMemberAction(new Action(event, 1L), "토다리", IN, 1L);
+        Action targetAction = new Action(event, 2L);
+        MemberAction memberAction2 = createMemberAction(targetAction, "토다리", OUT, 2L);
+        MemberAction memberAction3 = createMemberAction(new Action(event, 3L), "쿠키", IN, 3L);
+        MemberAction memberAction4 = createMemberAction(new Action(event, 4L), "웨디", IN, 4L);
+        MemberAction memberAction5 = createMemberAction(new Action(event, 5L), "감자", IN, 5L);
+        memberActionRepository.saveAll(
+                List.of(memberAction1,
+                        memberAction2,
+                        memberAction3,
+                        memberAction4,
+                        memberAction5
+                )
+        );
+        BillAction billAction = new BillAction(new Action(event, 6L), "뽕족", 100_000L);
+        billActionRepository.save(billAction);
+        BillActionDetail billActionDetail1 = new BillActionDetail(billAction, "쿠키", 40_000L);
+        BillActionDetail billActionDetail2 = new BillActionDetail(billAction, "웨디", 30_000L);
+        BillActionDetail billActionDetail3 = new BillActionDetail(billAction, "감자", 30_000L);
+        billActionDetailRepository.saveAll(List.of(billActionDetail1, billActionDetail2, billActionDetail3));
+
+        memberActionService.deleteMember(event.getToken(), "쿠키");
+
+        List<BillActionDetail> billActionDetails = billActionDetailRepository.findByBillAction(billAction);
+
+        assertThat(billActionDetails).hasSize(2)
+                .extracting("memberName", "price")
+                .containsExactlyInAnyOrder(
+                        tuple("웨디", 50_000L),
+                        tuple("감자", 50_000L)
+                );
+    }
+
     @DisplayName("이벤트에 속한 멤버 액션을 삭제하면 이후에 기록된 해당 참여자의 모든 멤버 액션을 삭제한다.")
     @Test
     void deleteMemberAction() {
@@ -151,6 +199,45 @@ void deleteMemberAction() {
                 );
     }
 
+    @DisplayName("이벤트에 속한 멤버 액션을 삭제하면 이후 지출 내역 디테일이 초기화된다.")
+    @Test
+    void deleteMemberAction1() {
+        Event event = Fixture.EVENT1;
+        eventRepository.save(event);
+        MemberAction memberAction1 = createMemberAction(new Action(event, 1L), "토다리", IN, 1L);
+        Action targetAction = new Action(event, 2L);
+        MemberAction memberAction2 = createMemberAction(targetAction, "토다리", OUT, 2L);
+        MemberAction memberAction3 = createMemberAction(new Action(event, 3L), "쿠키", IN, 3L);
+        MemberAction memberAction4 = createMemberAction(new Action(event, 4L), "웨디", IN, 4L);
+        MemberAction memberAction5 = createMemberAction(new Action(event, 5L), "감자", IN, 5L);
+        memberActionRepository.saveAll(
+                List.of(memberAction1,
+                        memberAction2,
+                        memberAction3,
+                        memberAction4,
+                        memberAction5
+                )
+        );
+        BillAction billAction = new BillAction(new Action(event, 6L), "뽕족", 100_000L);
+        billActionRepository.save(billAction);
+        BillActionDetail billActionDetail1 = new BillActionDetail(billAction, "쿠키", 40_000L);
+        BillActionDetail billActionDetail2 = new BillActionDetail(billAction, "웨디", 30_000L);
+        BillActionDetail billActionDetail3 = new BillActionDetail(billAction, "감자", 30_000L);
+        billActionDetailRepository.saveAll(List.of(billActionDetail1, billActionDetail2, billActionDetail3));
+
+        memberActionService.deleteMemberAction(event.getToken(), targetAction.getId());
+        List<BillActionDetail> billActionDetails = billActionDetailRepository.findByBillAction(billAction);
+
+        assertThat(billActionDetails).hasSize(4)
+                .extracting("memberName", "price")
+                .containsExactlyInAnyOrder(
+                        tuple("토다리", 25_000L),
+                        tuple("쿠키", 25_000L),
+                        tuple("웨디", 25_000L),
+                        tuple("감자", 25_000L)
+                );
+    }
+
     private MemberAction createMemberAction(
             Action action,
             String memberName,