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import { plainToInstance } from 'class-transformer';
import { DEFAULT_CUSTOMS } from 'src/commons/constants/custom-place';
import { Emojis } from 'src/commons/constants/emoji';
import { ERROR } from 'src/commons/constants/error';
import { getCustomByPlaceType } from 'src/commons/helpers/custom-by-place-type.helper';
import { getPlaceTypeKey } from 'src/commons/helpers/place-type.helper';
import { getRandomShuffleElements, getTopWeight } from 'src/commons/helpers/place-weight.helper';
import { isEmpty, isNotEmpty } from 'src/commons/util/is/is-empty';
import { generateUUID } from 'src/commons/util/uuid';
import { CourseQueryRepository } from 'src/course/course.query.repository';
import { ApiCourseGetPlaceCustomizeRequestQueryDto } from 'src/course/dto/api-course-get-place-customize-request-query.dto';
import { ApiCourseGetPlaceCustomizeResponseDto } from 'src/course/dto/api-course-get-place-customize-response.dto';
import { ApiCourseGetRecommendRequestQueryDto } from 'src/course/dto/api-course-get-recommend-request-query.dto';
import { ApiCourseGetRecommendResponseDto } from 'src/course/dto/api-course-get-recommend-response.dto';
import { CoursePlaceInfoDto } from 'src/course/dto/course-place-info.dto';
import { RecommendType } from 'src/course/enum/course-recommend.enum';
import { CourseDetailEntity } from 'src/entities/course.detail.entity';
import { PlaceEntity } from 'src/entities/place.entity';
import { ThemeEntity } from 'src/entities/theme.entity';
import { PlaceQueryRepository } from 'src/place/place.query.repository';
import { SubwayQueryRepository } from 'src/subway/subway.query.repository';
import { ThemeQueryRepository } from 'src/theme/theme.query.repository';
import { UserDto } from 'src/user/dto/user.dto';
@Injectable()
export class CourseRecommendationService {
constructor(
private readonly courseQueryRepository: CourseQueryRepository,
private readonly subwayQueryRepository: SubwayQueryRepository,
private readonly placeQueryRepository: PlaceQueryRepository,
private readonly themeQueryRepository: ThemeQueryRepository,
) {}
async getCourseRecommendation(
dto: ApiCourseGetRecommendRequestQueryDto,
user?: UserDto,
): Promise<ApiCourseGetRecommendResponseDto> {
// 1. 지하철역 및 노선 정보 조회
const subwayWithLines = await this.subwayQueryRepository.findAllLinesForStation(
dto.station_uuid,
);
if (isEmpty(subwayWithLines)) {
throw new NotFoundException(ERROR.NOT_EXIST_DATA);
}
// 2. 주변 장소 리스트 조회
const subwayPlaceList: PlaceEntity[] = await this.placeQueryRepository.findSubwayPlaceList(
dto,
subwayWithLines[0].name,
);
// 3. 테마 및 히스토리 조회 (존재할 경우)
const theme: ThemeEntity = isNotEmpty(dto.theme_uuid)
? await this.themeQueryRepository.findThemeUuid(dto.theme_uuid)
: null;
const userHistoryCourse: CourseDetailEntity[] = isNotEmpty(user)
? await this.courseQueryRepository.findUserHistoryCourse(user.uuid)
: [];
// 4. 각 커스텀에 해당하는 장소 조회 헬퍼 함수
const fetchPlacesByCustom = async (custom: string): Promise<PlaceEntity[]> => {
let placesByCategory = subwayPlaceList.filter((place) => place.place_type === custom);
// 해당 custom에 맞는 테마가 없을 시 재추천
if (placesByCategory.length === 0) {
const dtoWithoutTheme = { ...dto };
delete dtoWithoutTheme.theme_uuid;
const fallbackPlaces = await this.placeQueryRepository.findSubwayPlaceList(
dtoWithoutTheme,
subwayWithLines[0].name,
);
placesByCategory = fallbackPlaces.filter((place) => place.place_type === custom);
}
return placesByCategory;
};
// 5. 기본 커스텀 타입별로 가중치 계산 및 랜덤 선택, 병렬 처리
const selectionPlaces: PlaceEntity[] = (
await Promise.all(
DEFAULT_CUSTOMS.map(async (custom) => {
const customPlaces = await fetchPlacesByCustom(custom);
const topWeightedPlaces = getTopWeight(
customPlaces,
RecommendType.TOP_N,
userHistoryCourse,
);
const selectedPlaces = getRandomShuffleElements(
topWeightedPlaces,
RecommendType.RANDOM_SELECTION_COUNT,
);
if (isEmpty(selectedPlaces)) {
throw new NotFoundException(ERROR.NOT_EXIST_DATA);
}
return selectedPlaces;
}),
)
).flat();
// 6. 커스텀 순서 정렬 및 DTO 변환
const sortedPlaces: CoursePlaceInfoDto[] = [];
DEFAULT_CUSTOMS.forEach((custom, index) => {
const place = selectionPlaces.find((item) => item.place_type === custom);
const placeDetailDto = plainToInstance(CoursePlaceInfoDto, place, {
excludeExtraneousValues: true,
});
placeDetailDto.sort = index + 1;
placeDetailDto.place_type = getPlaceTypeKey(placeDetailDto.place_type);
placeDetailDto.place_detail = getCustomByPlaceType(place, custom);
sortedPlaces.push(placeDetailDto);
});
// 7. 코스 이름 생성
const stationName = subwayWithLines[0].name;
const courseName = isEmpty(theme)
? `${stationName}역, 주변 코스 일정 ${Emojis[Math.floor(Math.random() * Emojis.length)]}`
: `${stationName}역, ${theme.theme_name
.slice(0, -2)
.trim()} 코스 일정 ${theme.theme_name.slice(-2)}`;
// 7. Response 생성
const apiCourseGetRecommendResponseDto = new ApiCourseGetRecommendResponseDto({
course_uuid: generateUUID(),
course_name: courseName,
subway: {
uuid: subwayWithLines[0].uuid,
station: subwayWithLines[0].name,
},
line: subwayWithLines.map((line) => ({
uuid: line.uuid,
line: line.line,
})),
theme: theme ? { uuid: theme.uuid, theme: theme.theme_name } : undefined,
places: sortedPlaces,
});
return apiCourseGetRecommendResponseDto;
}
async addCustomPlaceToCourse(
dto: ApiCourseGetPlaceCustomizeRequestQueryDto,
user?: UserDto,
): Promise<ApiCourseGetPlaceCustomizeResponseDto> {
// 1. 지하철역 및 노선 정보 조회
const subwayStation = await this.subwayQueryRepository.findSubwayStationUuid(dto.station_uuid);
if (isEmpty(subwayStation)) {
throw new NotFoundException(ERROR.NOT_EXIST_DATA);
}
// 2. 주변 장소 리스트 조회
let subwayPlaceCustomizeList: PlaceEntity[] =
dto.place_type === 'CULTURE'
? await this.placeQueryRepository.findSubwayPlacesCustomizeCultureList(subwayStation.name)
: await this.placeQueryRepository.findSubwayPlacesCustomizeList(dto, subwayStation.name);
// 3. 이미 선택되어 있는 장소 제외
const placeUuidsSet = new Set(dto.place_uuids);
let filteredPlaceList = subwayPlaceCustomizeList.filter(
(place) => !placeUuidsSet.has(place.uuid),
);
// 4. 사용자 히스토리 기록 조회
const userHistoryCourse: CourseDetailEntity[] = isNotEmpty(user)
? await this.courseQueryRepository.findUserHistoryCourse(user.uuid)
: [];
// 5. 테마에 맞는 추가 장소가 없을 시 재추천
if (filteredPlaceList.length === 0) {
const dtoWithoutTheme = { ...dto };
delete dtoWithoutTheme.theme_uuid;
const fallbackList = await this.placeQueryRepository.findSubwayPlacesCustomizeList(
dtoWithoutTheme,
subwayStation.name,
);
filteredPlaceList = fallbackList.filter((place) => !placeUuidsSet.has(place.uuid));
}
// 6. 장소 가중치 계산 및 랜덤 선택
const topWeightedPlaces = getTopWeight(
filteredPlaceList,
RecommendType.TOP_N,
userHistoryCourse,
);
const selected = getRandomShuffleElements(
topWeightedPlaces,
RecommendType.RANDOM_SELECTION_COUNT,
);
if (isEmpty(selected)) {
throw new NotFoundException(ERROR.NOT_EXIST_DATA);
}
const selectedPlace = selected[0];
// 7. Response 생성
const apiCourseGetPlaceCustomizeResponseDto = plainToInstance(
ApiCourseGetPlaceCustomizeResponseDto,
{
...selectedPlace,
place_detail: getCustomByPlaceType(selectedPlace, selectedPlace.place_type),
place_type: getPlaceTypeKey(selectedPlace.place_type),
sort: dto.place_uuids.length + 1,
},
{ excludeExtraneousValues: true },
);
return apiCourseGetPlaceCustomizeResponseDto;
}
}
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