92 lines
2.9 KiB
Go
92 lines
2.9 KiB
Go
package service
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import (
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"context"
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"fashionapi/internal/dto"
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"fashionapi/internal/pkg/hashid"
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"fashionapi/internal/repository"
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)
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// BrandService 品牌业务接口。
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type BrandService interface {
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List(ctx context.Context, q dto.BrandQuery) ([]dto.PublicBrand, int64, error)
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// Popular 首页"热门品牌"区块：按图片数排名的前 limit 个品牌，附带代表走秀封面与标题。
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// locale 决定品牌名/标题的展示语言（cn/en）。
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Popular(ctx context.Context, limit int, locale string) ([]dto.PopularBrand, error)
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}
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type brandService struct {
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brands repository.BrandRepository
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}
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// NewBrandService 创建品牌服务。
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func NewBrandService(brands repository.BrandRepository) BrandService {
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return &brandService{brands: brands}
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}
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// List 查询品牌列表并附带每个品牌的档案数。
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//
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// featured=1 时先按指标算出"代表品牌"集合，再把列表收敛到该集合内 ——
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// 全库 1600+ 有档案品牌对 A-Z 索引来说过多，精选前 200 更符合导航场景。
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func (s *brandService) List(ctx context.Context, q dto.BrandQuery) ([]dto.PublicBrand, int64, error) {
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q.Normalize()
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var restrictIDs []uint32
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if q.Featured {
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ids, err := s.brands.FeaturedIDs(ctx, q.Metric, q.Limit)
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if err != nil {
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// 取不到精选集合时交给 repository 收窄为空集，
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// 绝不静默退化成"返回全部品牌"——那会让前端索引突然膨胀。
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restrictIDs = nil
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} else {
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restrictIDs = ids
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}
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}
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items, total, err := s.brands.List(ctx, q, restrictIDs)
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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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ids := make([]uint32, 0, len(items))
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for _, b := range items {
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ids = append(ids, b.ID)
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}
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counts, err := s.brands.ArticleCountByBrandIDs(ctx, ids)
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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.PublicBrand, 0, len(items))
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for _, b := range items {
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list = append(list, dto.PublicBrand{
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UID: hashid.Encode(b.ID),
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Name: pickLocale(b.NameEn, b.NameCn, q.Locale),
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ShowName: b.NameCn,
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ArticleCount: counts[b.ID],
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})
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}
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return list, total, nil
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}
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// Popular 热门品牌（首页区块用）：按图片数排名的前 limit 个品牌，附带代表走秀封面与标题。
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// 复用仓储层的 FeaturedIDs 排名逻辑，保持与"代表品牌"一致的"热门"定义。locale 选展示语言。
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func (s *brandService) Popular(ctx context.Context, limit int, locale string) ([]dto.PopularBrand, error) {
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rows, err := s.brands.PopularWithCover(ctx, limit)
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if err != nil {
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return nil, internalErr(err.Error())
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}
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out := make([]dto.PopularBrand, 0, len(rows))
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for _, b := range rows {
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out = append(out, dto.PopularBrand{
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UID: hashid.Encode(b.ID),
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ArticleUID: hashid.Encode(b.ArticleID),
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Brand: pickLocale(b.BrandEn, b.BrandCn, locale),
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Cover: b.Cover,
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Title: pickLocale(b.TitleEn, b.TitleCn, locale),
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})
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}
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return out, nil
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}
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