[BE] 지출로그 추가 기능 구현

server/build.gradle

@@ -26,6 +26,7 @@ repositories {
 dependencies {
     implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
     implementation 'org.springframework.boot:spring-boot-starter-web'
+    implementation 'org.springframework.boot:spring-boot-starter-validation'
     compileOnly 'org.projectlombok:lombok'
     runtimeOnly 'com.h2database:h2'
     runtimeOnly 'com.mysql:mysql-connector-j'

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

@@ -0,0 +1,42 @@
+package server.haengdong.application;
+
+import java.util.List;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import server.haengdong.application.request.BillActionAppRequest;
+import server.haengdong.domain.Action;
+import server.haengdong.domain.BillAction;
+import server.haengdong.domain.Event;
+import server.haengdong.persistence.ActionRepository;
+import server.haengdong.persistence.BillActionRepository;
+import server.haengdong.persistence.EventRepository;
+
+@RequiredArgsConstructor
+@Transactional(readOnly = true)
+@Service
+public class BillActionService {
+
+    private final BillActionRepository billActionRepository;
+    private final ActionRepository actionRepository;
+    private final EventRepository eventRepository;
+
+    @Transactional
+    public void saveAllBillAction(String eventToken, List<BillActionAppRequest> requests) {
+        Event event = eventRepository.findByToken(eventToken)
+                .orElseThrow(() -> new IllegalArgumentException("존재하지 않는 이벤트 토큰입니다."));
+        Action action = createStartAction(event);
+
+        for (BillActionAppRequest request : requests) {
+            BillAction billAction = request.toBillAction(action);
+            billActionRepository.save(billAction);
+            action = action.next();
+        }
+    }
+
+    private Action createStartAction(Event event) {
+        return actionRepository.findLastByEvent(event)
+                .map(Action::next)
+                .orElse(Action.createFirst(event));
+    }
+}

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

@@ -20,6 +20,6 @@ public EventAppResponse saveEvent(EventAppRequest request) {
         Event event = request.toEvent(token);
         eventRepository.save(event);
 
-         return EventAppResponse.of(event);
+        return EventAppResponse.of(event);
     }
 }

server/src/main/java/server/haengdong/application/request/BillActionAppRequest.java

@@ -0,0 +1,14 @@
+package server.haengdong.application.request;
+
+import server.haengdong.domain.Action;
+import server.haengdong.domain.BillAction;
+
+public record BillActionAppRequest(
+        String title,
+        Long price
+) {
+
+    public BillAction toBillAction(Action action) {
+        return new BillAction(action, title, price);
+    }
+}

server/src/main/java/server/haengdong/domain/Action.java

@@ -15,6 +15,8 @@
 @Entity
 public class Action {
 
+    private static final long FIRST_SEQUENCE = 1L;
+
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
@@ -23,4 +25,17 @@ public class Action {
     private Event event;
 
     private Long sequence;
+
+    public Action(Event event, Long sequence) {
+        this.event = event;
+        this.sequence = sequence;
+    }
+
+    public static Action createFirst(Event event) {
+        return new Action(event, FIRST_SEQUENCE);
+    }
+
+    public Action next() {
+        return new Action(event, sequence + 1);
+    }
 }

server/src/main/java/server/haengdong/domain/BillAction.java

@@ -1,12 +1,13 @@
 package server.haengdong.domain;
 
+import jakarta.persistence.CascadeType;
+import jakarta.persistence.Column;
 import jakarta.persistence.Entity;
 import jakarta.persistence.FetchType;
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
 import jakarta.persistence.OneToOne;
-import java.math.BigDecimal;
 import lombok.AccessLevel;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
@@ -16,14 +17,45 @@
 @Entity
 public class BillAction {
 
+    private static final int MIN_TITLE_LENGTH = 2;
+    private static final int MAX_TITLE_LENGTH = 30;
+    private static final long MIN_PRICE = 1L;
+    private static final long MAX_PRICE = 10_000_000L;
+
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
-    @OneToOne(fetch = FetchType.LAZY)
+    @OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL, orphanRemoval = true)
     private Action action;
 
+    @Column(length = MAX_TITLE_LENGTH)
     private String title;
 
-    private BigDecimal price;
+    private Long price;
+
+    public BillAction(Action action, String title, Long price) {
+        validateTitle(title);
+        validatePrice(price);
+        this.action = action;
+        this.title = title.trim();
+        this.price = price;
+    }
+
+    private void validateTitle(String title) {
+        int titleLength = title.trim().length();
+        if (titleLength < MIN_TITLE_LENGTH || titleLength > MAX_TITLE_LENGTH) {
+            throw new IllegalArgumentException("앞뒤 공백을 제거한 지출 내역 제목은 2 ~ 30자여야 합니다.");
+        }
+    }
+
+    private void validatePrice(Long price) {
+        if (price < MIN_PRICE || price > MAX_PRICE) {
+            throw new IllegalArgumentException("지출 금액은 10,000,000 이하의 자연수여야 합니다.");
+        }
+    }
+
+    public Long getSequence() {
+        return action.getSequence();
+    }
 }

server/src/main/java/server/haengdong/persistence/ActionRepository.java

@@ -0,0 +1,21 @@
+package server.haengdong.persistence;
+
+import java.util.Optional;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.stereotype.Repository;
+import server.haengdong.domain.Action;
+import server.haengdong.domain.Event;
+
+@Repository
+public interface ActionRepository extends JpaRepository<Action, Long> {
+
+    @Query("""
+            SELECT a
+            FROM Action a
+            WHERE a.event = :event
+            ORDER BY a.sequence DESC
+            LIMIT 1
+            """)
+    Optional<Action> findLastByEvent(Event event);
+}

server/src/main/java/server/haengdong/persistence/BillActionRepository.java

@@ -0,0 +1,15 @@
+package server.haengdong.persistence;
+
+import java.util.List;
+import org.springframework.data.jpa.repository.EntityGraph;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+import server.haengdong.domain.BillAction;
+import server.haengdong.domain.Event;
+
+@Repository
+public interface BillActionRepository extends JpaRepository<BillAction, Long> {
+
+    @EntityGraph(attributePaths = {"action"})
+    List<BillAction> findByAction_Event(Event event);
+}

server/src/main/java/server/haengdong/persistence/EventRepository.java

@@ -1,9 +1,12 @@
 package server.haengdong.persistence;
 
+import java.util.Optional;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.stereotype.Repository;
 import server.haengdong.domain.Event;
 
 @Repository
 public interface EventRepository extends JpaRepository<Event, Long> {
+
+    Optional<Event> findByToken(String token);
 }

server/src/main/java/server/haengdong/presentation/BillActionController.java

@@ -0,0 +1,29 @@
+package server.haengdong.presentation;
+
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RestController;
+import server.haengdong.application.BillActionService;
+import server.haengdong.presentation.request.BillActionsSaveRequest;
+
+@RequiredArgsConstructor
+@RestController
+public class BillActionController {
+
+    private final BillActionService billActionService;
+
+    @PostMapping("/api/events/{token}/actions/bills")
+    public ResponseEntity<Void> saveAllBillAction(
+            @PathVariable String token,
+            @RequestBody @Valid BillActionsSaveRequest request
+    ) {
+        billActionService.saveAllBillAction(token, request.toAppRequests());
+
+        return ResponseEntity.ok()
+                .build();
+    }
+}

server/src/main/java/server/haengdong/presentation/request/BillActionSaveRequest.java

@@ -0,0 +1,22 @@
+package server.haengdong.presentation.request;
+
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Positive;
+import jakarta.validation.constraints.Size;
+import server.haengdong.application.request.BillActionAppRequest;
+
+public record BillActionSaveRequest(
+
+        @NotNull
+        @Size(min = 2, max = 30)
+        String title,
+
+        @NotNull
+        @Positive
+        Long price
+) {
+
+    public BillActionAppRequest toAppRequest() {
+        return new BillActionAppRequest(title, price);
+    }
+}

server/src/main/java/server/haengdong/presentation/request/BillActionsSaveRequest.java

@@ -0,0 +1,14 @@
+package server.haengdong.presentation.request;
+
+import jakarta.validation.Valid;
+import java.util.List;
+import server.haengdong.application.request.BillActionAppRequest;
+
+public record BillActionsSaveRequest(@Valid List<BillActionSaveRequest> actions) {
+
+    public List<BillActionAppRequest> toAppRequests() {
+        return actions.stream()
+                .map(BillActionSaveRequest::toAppRequest)
+                .toList();
+    }
+}

server/src/main/resources/application.yml

@@ -0,0 +1,15 @@
+spring:
+  h2:
+    console:
+      enabled: true
+      path: /h2-console
+  datasource:
+    url: jdbc:h2:mem:database
+  jpa:
+    defer-datasource-initialization: true
+    show-sql: true
+    properties:
+      hibernate:
+        format_sql: true
+    hibernate:
+      ddl-auto: create-drop

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

@@ -0,0 +1,65 @@
+package server.haengdong.application;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.assertj.core.api.Assertions.tuple;
+
+import java.util.List;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import server.haengdong.application.request.BillActionAppRequest;
+import server.haengdong.domain.BillAction;
+import server.haengdong.domain.Event;
+import server.haengdong.persistence.BillActionRepository;
+import server.haengdong.persistence.EventRepository;
+
+@SpringBootTest
+class BillActionServiceTest {
+
+    @Autowired
+    private BillActionService billActionService;
+
+    @Autowired
+    private EventRepository eventRepository;
+
+    @Autowired
+    private BillActionRepository billActionRepository;
+
+    @DisplayName("지출 내역을 생성한다.")
+    @Test
+    void saveAllBillAction() {
+        String token = "TOKEN";
+        Event event = new Event("감자", token);
+        Event savedEvent = eventRepository.save(event);
+
+        List<BillActionAppRequest> requests = List.of(
+                new BillActionAppRequest("뽕족", 10_000L),
+                new BillActionAppRequest("인생맥주", 15_000L)
+        );
+
+        billActionService.saveAllBillAction(token, requests);
+
+        List<BillAction> actions = billActionRepository.findByAction_Event(savedEvent);
+
+        assertThat(actions).extracting(BillAction::getTitle, BillAction::getPrice, BillAction::getSequence)
+                .containsExactlyInAnyOrder(
+                        tuple("뽕족", 10_000L, 1L),
+                        tuple("인생맥주", 15_000L, 2L)
+                );
+    }
+
+    @DisplayName("이벤트가 존재하지 않으면 지출 내역을 생성할 수 없다.")
+    @Test
+    void saveAllBillAction1() {
+        List<BillActionAppRequest> requests = List.of(
+                new BillActionAppRequest("뽕족", 10_000L),
+                new BillActionAppRequest("인생맥주", 15_000L)
+        );
+
+        assertThatThrownBy(() -> billActionService.saveAllBillAction("token", requests))
+                .isInstanceOf(IllegalArgumentException.class)
+                .hasMessage("존재하지 않는 이벤트 토큰입니다.");
+    }
+}