[feat] 여행 기간을 계산하는 기능 구현 (#289)

backend/src/main/java/dev/tripdraw/domain/trip/Trip.java

@@ -2,6 +2,7 @@
 
 import static dev.tripdraw.domain.trip.TripStatus.ONGOING;
 import static dev.tripdraw.exception.trip.TripExceptionType.NOT_AUTHORIZED_TO_TRIP;
+import static dev.tripdraw.exception.trip.TripExceptionType.ONE_OR_NO_POINT;
 import static dev.tripdraw.exception.trip.TripExceptionType.TRIP_INVALID_STATUS;
 import static jakarta.persistence.FetchType.LAZY;
 import static jakarta.persistence.GenerationType.IDENTITY;
@@ -17,6 +18,7 @@
 import jakarta.persistence.Id;
 import jakarta.persistence.JoinColumn;
 import jakarta.persistence.ManyToOne;
+import java.time.Duration;
 import java.util.List;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
@@ -80,6 +82,18 @@ public void validateAuthorization(Member member) {
         }
     }
 
+    public TripDuration calculateTripDuration() {
+        List<Point> points = points();
+        if (points.size() == 1 || points.isEmpty()) {
+            throw new TripException(ONE_OR_NO_POINT);
+        }
+        Point startingPoint = points.get(0);
+        Point arrivalPoint = points.get(points.size() - 1);
+
+        Duration between = Duration.between(startingPoint.recordedAt(), arrivalPoint.recordedAt());
+        return TripDuration.of(between);
+    }
+
     public void changeStatus(TripStatus status) {
         validateStatus(status);
         this.status = status;

backend/src/main/java/dev/tripdraw/domain/trip/TripDuration.java

@@ -0,0 +1,41 @@
+package dev.tripdraw.domain.trip;
+
+import java.time.Duration;
+
+public class TripDuration {
+
+    private static final String MINUTE = "분";
+    private static final String HOUR = "시간";
+    private static final String DAY = "일";
+    private static final String WHITE_SPACE = " ";
+
+    private final Duration duration;
+
+    private TripDuration(Duration duration) {
+        this.duration = duration;
+    }
+
+    public static TripDuration of(Duration duration) {
+        return new TripDuration(duration);
+    }
+
+    public String durationInMinutes() {
+        long minutes = duration.toMinutes();
+        return minutes + MINUTE;
+    }
+
+    public String durationInHoursAndMinutes() {
+        long hours = duration.toHours();
+        long minutes = duration.toMinutes() - (hours * 60);
+
+        return hours + HOUR + WHITE_SPACE + minutes + MINUTE;
+    }
+
+    public String durationInDaysAndHoursAndMinutes() {
+        long days = duration.toDays();
+        long hours = duration.toHours() - (days * 24);
+        long minutes = duration.toMinutes() - (days * 1440) - (hours * 60);
+
+        return days + DAY + WHITE_SPACE + hours + HOUR + WHITE_SPACE + minutes + MINUTE;
+    }
+}

backend/src/main/java/dev/tripdraw/exception/trip/TripExceptionType.java

@@ -17,6 +17,7 @@ public enum TripExceptionType implements ExceptionType {
     TRIP_INVALID_STATUS(BAD_REQUEST, "잘못된 여행 상태입니다."),
     POINT_ALREADY_HAS_POST(CONFLICT, "이미 감상이 등록된 위치입니다."),
     TRIP_ALREADY_DELETED(CONFLICT, "이미 삭제된 여행입니다."),
+    ONE_OR_NO_POINT(BAD_REQUEST, ""),
     ;
 
     private final HttpStatus httpStatus;

backend/src/test/java/dev/tripdraw/domain/trip/TripDurationTest.java

@@ -0,0 +1,41 @@
+package dev.tripdraw.domain.trip;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.time.Duration;
+import org.junit.jupiter.api.DisplayNameGeneration;
+import org.junit.jupiter.api.DisplayNameGenerator;
+import org.junit.jupiter.api.Test;
+
+@SuppressWarnings("NonAsciiCharacters")
+@DisplayNameGeneration(DisplayNameGenerator.ReplaceUnderscores.class)
+class TripDurationTest {
+
+    private final TripDuration tripDuration = TripDuration.of(Duration.ofMinutes(3248));
+
+    @Test
+    void 여행기간을_분_단위로_나타낸다() {
+        // given & when
+        String durationInMinutes = tripDuration.durationInMinutes();
+
+        // then
+        assertThat(durationInMinutes).isEqualTo("3248분");
+    }
+
+    @Test
+    void 여행기간을_시간과_분_단위로_나타낸다() {
+        // given & when
+        String durationInHoursAndMinutes = tripDuration.durationInHoursAndMinutes();
+
+        // then
+        assertThat(durationInHoursAndMinutes).isEqualTo("54시간 8분");
+    }
+
+    @Test
+    void 여행기간을_일과_시간과_분_단위로_나타낸다() {
+        // given & when
+        String durationInDaysAndHoursAndMinutes = tripDuration.durationInDaysAndHoursAndMinutes();
+        // then
+        assertThat(durationInDaysAndHoursAndMinutes).isEqualTo("2일 6시간 8분");
+    }
+}

backend/src/test/java/dev/tripdraw/domain/trip/TripTest.java

@@ -278,4 +278,13 @@ class TripTest {
         // expect
         assertThat(trip.points()).containsExactly(point1);
     }
+
+    @Test
+    void 총_여행기간을_반환한다() {
+        // given
+
+        // when
+
+        // then
+    }
 }