拆分系统配置 Service 文件职责

backend/internal/modules/systemconfig/service_home.go

@@ -0,0 +1,64 @@
+package systemconfig
+
+import (
+	"context"
+	"encoding/json"
+)
+
+func (s *Service) HomeAnnouncements(ctx context.Context) (*HomeAnnouncementsDTO, error) {
+	if s.repo == nil {
+		return nil, ErrDependencyUnavailable
+	}
+	items, err := s.homeAnnouncements(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return &HomeAnnouncementsDTO{Items: items}, nil
+}
+
+func (s *Service) HomeConfig(ctx context.Context) (*HomeConfigDTO, error) {
+	if s.repo == nil {
+		return nil, ErrDependencyUnavailable
+	}
+	announcements, err := s.homeAnnouncements(ctx)
+	if err != nil {
+		return nil, err
+	}
+	banners, err := s.homeBanners(ctx)
+	if err != nil {
+		return nil, err
+	}
+	publishOptions, err := s.publishOptions(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return &HomeConfigDTO{
+		Announcements:  announcements,
+		Banners:        banners,
+		PublishOptions: publishOptions,
+	}, nil
+}
+
+func (s *Service) homeAnnouncements(ctx context.Context) ([]string, error) {
+	value, err := s.repo.FindValue(ctx, homeAnnouncementsConfigKey)
+	if err != nil {
+		return nil, err
+	}
+	items := defaultHomeAnnouncements()
+	if err := json.Unmarshal([]byte(value), &items); err != nil {
+		items = defaultHomeAnnouncements()
+	}
+	return normalizeAnnouncements(items), nil
+}
+
+func (s *Service) homeBanners(ctx context.Context) ([]HomeBannerItem, error) {
+	value, err := s.repo.FindValue(ctx, homeBannersConfigKey)
+	if err != nil {
+		return nil, err
+	}
+	items := defaultHomeBanners()
+	if err := json.Unmarshal([]byte(value), &items); err != nil {
+		items = defaultHomeBanners()
+	}
+	return normalizeHomeBanners(items), nil
+}