136 lines
4.3 KiB
Go
136 lines
4.3 KiB
Go
package service
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import (
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"context"
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"errors"
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"net/http"
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"fashionapi/internal/dto"
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"fashionapi/internal/model"
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"fashionapi/internal/pkg/hashid"
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"fashionapi/internal/repository"
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)
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// ArticleService 文章业务接口。
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type ArticleService interface {
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List(ctx context.Context, q dto.ArticleQuery) ([]dto.PublicArticle, int64, error)
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Detail(ctx context.Context, id string, locale string) (*dto.PublicArticleDetail, error)
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}
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type articleService struct {
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articles repository.ArticleRepository
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}
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// NewArticleService 创建文章服务。
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func NewArticleService(articles repository.ArticleRepository) ArticleService {
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return &articleService{articles: articles}
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}
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// List 查询文章列表，并按需附带每篇的前 N 张图。
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func (s *articleService) List(ctx context.Context, q dto.ArticleQuery) ([]dto.PublicArticle, int64, error) {
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q.Normalize()
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rows, total, err := s.articles.List(ctx, q)
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if err != nil {
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return nil, 0, internalErr(err.Error())
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}
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list := make([]dto.PublicArticle, 0, len(rows))
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ids := make([]uint32, 0, len(rows))
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for _, r := range rows {
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ids = append(ids, r.ID)
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list = append(list, dto.PublicArticle{
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UID: hashid.EncodeTyped(hashid.TypeRunway, r.ID),
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BrandUID: hashid.Encode(r.BrandID),
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Title: pickLocale(r.TitleEn, r.TitleCn, q.Locale),
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Cover: r.Cover,
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BrandName: pickLocale(r.BrandNameEn, r.BrandNameCn, "en"), // 品牌名强制优先英文，保持英文观感
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ImageCount: r.ImageCount,
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})
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}
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if q.Images > 0 && len(list) > 0 {
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if err := s.attachImages(ctx, list, ids, q.Images); err != nil {
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return nil, 0, internalErr(err.Error())
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}
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}
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return list, total, nil
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}
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// attachImages 用单次 IN 查询为列表批量补齐图片，避免前端逐篇请求详情。
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// ids 是与之对应的数字主键（对外已编码为 UID，此处用数字主键查库）。
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func (s *articleService) attachImages(ctx context.Context, list []dto.PublicArticle, ids []uint32, limit int) error {
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grouped, err := s.articles.ImagesByRunwayIDs(ctx, ids)
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if err != nil {
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return err
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}
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for i := range list {
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imgs, ok := grouped[ids[i]]
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if !ok {
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continue
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}
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// 缩略图条带剔除主图(cover)，避免与卡片主图重复。cover 恒等于图片列表首张。
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imgs = excludeCover(imgs, list[i].Cover)
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if len(imgs) > limit {
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imgs = imgs[:limit]
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}
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list[i].Images = toPublicImages(imgs)
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}
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return nil
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}
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// excludeCover 从图片列表中去掉与主图(cover)同 URL 的元素，供列表缩略图条带使用。
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// 详情接口(完整图集)不走此函数，封面作为其中一张 look 需保留。
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func excludeCover(imgs []model.BrandRunwayImage, cover string) []model.BrandRunwayImage {
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if cover == "" {
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return imgs
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}
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kept := imgs[:0]
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for _, im := range imgs {
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if im.Image != cover {
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kept = append(kept, im)
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}
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}
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return kept
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}
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// Detail 查询文章详情，含完整图片集。locale 决定标题/描述/品牌名的展示语言。
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func (s *articleService) Detail(ctx context.Context, id string, locale string) (*dto.PublicArticleDetail, error) {
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row, err := s.articles.FindByID(ctx, id)
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if err != nil {
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if errors.Is(err, repository.ErrNotFound) {
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return nil, ErrArticleNotFound
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}
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return nil, NewError(http.StatusInternalServerError, err.Error())
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}
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imgs, err := s.articles.ListImages(ctx, id)
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if err != nil {
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return nil, internalErr(err.Error())
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}
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return &dto.PublicArticleDetail{
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UID: hashid.EncodeTyped(hashid.TypeRunway, row.ID),
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BrandUID: hashid.Encode(row.BrandID),
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Title: pickLocale(row.TitleEn, row.TitleCn, locale),
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Description: pickLocale(row.DescriptionEn, row.DescriptionCn, locale),
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Cover: row.Cover,
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// 品牌名强制优先英文（"en"），不随 locale 切换，保持英文观感。
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BrandName: pickLocale(row.BrandNameEn, row.BrandNameCn, "en"),
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Images: toPublicImages(imgs),
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}, nil
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}
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// IDs 返回全部文章的编码 uid（供 SSG 枚举详情页路径使用，对外暴露的即编码串）。
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// toPublicImages 把图片实体映射为对外结构（只保留 url 与名称）。
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func toPublicImages(imgs []model.BrandRunwayImage) []dto.PublicArticleImage {
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if len(imgs) == 0 {
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return nil
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}
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out := make([]dto.PublicArticleImage, 0, len(imgs))
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for _, im := range imgs {
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out = append(out, dto.PublicArticleImage{Image: im.Image, Name: im.Name})
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}
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return out
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}
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