[Feature] - 여행기 상세 조회 Service 생성

* refactor: 장소에 대한 위도, 경도의 타입을 Double에서 String 으로 변경

* feat: 여행기 상세 조회 응답 response 생성

* feat: 여행기 상세 조회 Service 생성

* refactor: 여행기 상세 조회 응답 구조 변경

backend/src/main/java/woowacourse/touroot/place/domain/Place.java

@@ -19,10 +19,10 @@ public class Place {
     private String name;
 
     @Column(nullable = false)
-    private Double latitude;
+    private String latitude;
 
     @Column(nullable = false)
-    private Double longitude;
+    private String longitude;
 
     private String googlePlaceId;
 }

backend/src/main/java/woowacourse/touroot/travelogue/dto/TravelogueResponse.java

@@ -0,0 +1,7 @@
+package woowacourse.touroot.travelogue.dto;
+
+import java.util.List;
+import woowacourse.touroot.travelogueday.dto.TravelogueDayResponse;
+
+public record TravelogueResponse(String title, String thumbnail, List<TravelogueDayResponse> days) {
+}

backend/src/main/java/woowacourse/touroot/travelogue/service/TravelogueService.java

@@ -0,0 +1,59 @@
+package woowacourse.touroot.travelogue.service;
+
+import java.util.Comparator;
+import java.util.List;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import woowacourse.touroot.travelogue.domain.Travelogue;
+import woowacourse.touroot.travelogue.dto.TravelogueResponse;
+import woowacourse.touroot.travelogue.repository.TravelogueRepository;
+import woowacourse.touroot.travelogueday.domain.TravelogueDay;
+import woowacourse.touroot.travelogueday.dto.TravelogueDayResponse;
+import woowacourse.touroot.traveloguephoto.domain.TraveloguePhoto;
+import woowacourse.touroot.travelogueplace.domain.TraveloguePlace;
+import woowacourse.touroot.travelogueplace.dto.TraveloguePlaceResponse;
+
+@RequiredArgsConstructor
+@Service
+public class TravelogueService {
+
+    private final TravelogueRepository travelogueRepository;
+
+    @Transactional(readOnly = true)
+    public TravelogueResponse findTravelogueById(Long id) {
+        Travelogue travelogue = travelogueRepository.findById(id).get();
+
+        return new TravelogueResponse(travelogue.getTitle(), travelogue.getThumbnail(), getDayResponses(travelogue));
+    }
+
+    private List<TravelogueDayResponse> getDayResponses(Travelogue travelogue) {
+        return travelogue.getTravelogueDays()
+                .stream()
+                .sorted(Comparator.comparing(TravelogueDay::getOrder))
+                .map(travelogueDay -> new TravelogueDayResponse(getPlaceResponses(travelogueDay)))
+                .toList();
+    }
+
+    private List<TraveloguePlaceResponse> getPlaceResponses(TravelogueDay day) {
+        return day.getTraveloguePlaces()
+                .stream()
+                .sorted(Comparator.comparing(TraveloguePlace::getOrder))
+                .map(traveloguePlace -> new TraveloguePlaceResponse(
+                        traveloguePlace.getPlace().getName(),
+                        getPhotoUrls(traveloguePlace),
+                        traveloguePlace.getDescription(),
+                        traveloguePlace.getPlace().getLatitude(),
+                        traveloguePlace.getPlace().getLongitude()
+                ))
+                .toList();
+    }
+
+    private List<String> getPhotoUrls(TraveloguePlace traveloguePlace) {
+        return traveloguePlace.getTraveloguePhotos()
+                .stream()
+                .sorted(Comparator.comparing(TraveloguePhoto::getOrder))
+                .map(TraveloguePhoto::getKey)
+                .toList();
+    }
+}

backend/src/main/java/woowacourse/touroot/travelogueday/dto/TravelogueDayResponse.java

@@ -0,0 +1,7 @@
+package woowacourse.touroot.travelogueday.dto;
+
+import java.util.List;
+import woowacourse.touroot.travelogueplace.dto.TraveloguePlaceResponse;
+
+public record TravelogueDayResponse(List<TraveloguePlaceResponse> places) {
+}

backend/src/main/java/woowacourse/touroot/travelogueplace/dto/TraveloguePlaceResponse.java

@@ -0,0 +1,12 @@
+package woowacourse.touroot.travelogueplace.dto;
+
+import java.util.List;
+
+public record TraveloguePlaceResponse(
+        String name,
+        List<String> photoUrls,
+        String description,
+        String latitude,
+        String longitude
+) {
+}