split media service read paths

internal/service/media_listing.go

@@ -0,0 +1,109 @@
+package service
+
+import (
+	"context"
+	"time"
+
+	"go.uber.org/zap"
+
+	"github.com/ShukeBta/MediaStationGo/internal/model"
+	"github.com/ShukeBta/MediaStationGo/internal/repository"
+)
+
+// ListMedia paginates media items inside a library.
+func (s *MediaService) ListMedia(ctx context.Context, libraryID string, page, pageSize int) ([]model.Media, int64, error) {
+	return s.ListMediaVisible(ctx, libraryID, page, pageSize, MediaVisibility{IncludeNSFW: true})
+}
+
+func (s *MediaService) ListMediaVisible(ctx context.Context, libraryID string, page, pageSize int, visibility MediaVisibility) ([]model.Media, int64, error) {
+	if pageSize <= 0 {
+		pageSize = 50
+	}
+	if pageSize > 2000 {
+		pageSize = 2000
+	}
+	if page < 1 {
+		page = 1
+	}
+	visibility = ExpandMediaVisibilityForMergedCloudLibraries(ctx, s.repo, visibility)
+	libraryIDs, err := MergedLibraryIDsForLibrary(ctx, s.repo, libraryID)
+	if err != nil {
+		return nil, 0, err
+	}
+	filter := repository.MediaQueryFilter{
+		IncludeNSFW:       visibility.IncludeNSFW,
+		AllowedLibraryIDs: visibility.AllowedLibraryIDs,
+		HiddenLibraryIDs:  visibility.HiddenLibraryIDs,
+	}
+	cacheKey := s.mediaListCacheKey(libraryID, libraryIDs, page, pageSize, filter)
+	var cached mediaListCacheValue
+	if s.cache != nil && s.cache.GetJSON(ctx, cacheKey, &cached) {
+		s.attachLibraryMetadata(ctx, cached.Items)
+		return cached.Items, cached.Total, nil
+	}
+	items, total, err := s.repo.Media.ListByLibrariesFiltered(ctx, libraryIDs, (page-1)*pageSize, pageSize, filter)
+	if err != nil {
+		return nil, 0, err
+	}
+	s.attachLibraryMetadata(ctx, items)
+	if s.cache != nil {
+		s.cache.SetJSON(ctx, cacheKey, mediaListCacheValue{Items: items, Total: total}, time.Duration(s.mediaCacheTTLSeconds())*time.Second)
+	}
+	return items, total, nil
+}
+
+func (s *MediaService) ListMediaVisibleGrouped(ctx context.Context, libraryID string, page, pageSize int, visibility MediaVisibility) ([]MediaItem, int64, error) {
+	page, pageSize = normalizeGroupedMediaPage(page, pageSize)
+	items, err := s.listMediaVisibleForGrouping(ctx, libraryID, visibility)
+	if err != nil {
+		return nil, 0, err
+	}
+	grouped := groupMediaVersions(items)
+	return paginateMediaItems(grouped, page, pageSize), int64(len(grouped)), nil
+}
+
+func (s *MediaService) listMediaVisibleForGrouping(ctx context.Context, libraryID string, visibility MediaVisibility) ([]model.Media, error) {
+	visibility = ExpandMediaVisibilityForMergedCloudLibraries(ctx, s.repo, visibility)
+	libraryIDs, err := MergedLibraryIDsForLibrary(ctx, s.repo, libraryID)
+	if err != nil {
+		return nil, err
+	}
+	filter := repository.MediaQueryFilter{
+		IncludeNSFW:       visibility.IncludeNSFW,
+		AllowedLibraryIDs: visibility.AllowedLibraryIDs,
+		HiddenLibraryIDs:  visibility.HiddenLibraryIDs,
+	}
+	cacheKey := s.mediaListCacheKey(libraryID, libraryIDs, 0, maxMediaSearchLimit, filter) + ":group-source"
+	var cached mediaListCacheValue
+	if s.cache != nil && s.cache.GetJSON(ctx, cacheKey, &cached) {
+		s.attachLibraryMetadata(ctx, cached.Items)
+		return cached.Items, nil
+	}
+	items, total, err := s.repo.Media.ListByLibrariesFiltered(ctx, libraryIDs, 0, maxMediaSearchLimit, filter)
+	if err != nil {
+		return nil, err
+	}
+	if total > int64(len(items)) && s.log != nil {
+		s.log.Warn("media version grouping truncated by safety limit",
+			zap.String("library_id", libraryID),
+			zap.Int64("total", total),
+			zap.Int("limit", maxMediaSearchLimit))
+	}
+	s.attachLibraryMetadata(ctx, items)
+	if s.cache != nil {
+		s.cache.SetJSON(ctx, cacheKey, mediaListCacheValue{Items: items, Total: total}, time.Duration(s.mediaCacheTTLSeconds())*time.Second)
+	}
+	return items, nil
+}
+
+// GetMedia returns a single media row.
+func (s *MediaService) GetMedia(ctx context.Context, id string) (*model.Media, error) {
+	media, err := s.repo.Media.FindByID(ctx, id)
+	if err != nil || media == nil {
+		return media, err
+	}
+	items := []model.Media{*media}
+	s.attachLibraryMetadata(ctx, items)
+	*media = items[0]
+	return media, nil
+}