refactor: split modules and harden scraping workflows

internal/service/emby_artwork.go

@@ -0,0 +1,75 @@
+package service
+
+import (
+	"context"
+	"strings"
+
+	"github.com/ShukeBta/MediaStationGo/internal/model"
+)
+
+// ImageURL returns artwork for a media/series/season item id.
+func (e *EmbyService) ImageURL(ctx context.Context, id, imageType string) (string, error) {
+	pick := func(primary, backdrop string) string {
+		switch strings.ToLower(imageType) {
+		case "backdrop", "art":
+			if backdrop != "" {
+				return backdrop
+			}
+		}
+		if primary != "" {
+			return primary
+		}
+		return backdrop
+	}
+	if strings.HasPrefix(id, embyVirtualSeasonPrefix) {
+		if raw, ok := e.cachedArtworkURL(id, imageType); ok {
+			return raw, nil
+		}
+		return "", nil
+	}
+	if strings.HasPrefix(id, embyVirtualSeriesPrefix) {
+		if raw, ok := e.cachedArtworkURL(id, imageType); ok {
+			return raw, nil
+		}
+		return "", nil
+	}
+	m, err := e.repo.Media.FindByID(ctx, id)
+	if err == nil && m != nil {
+		if e.mediaShouldBeEpisode(ctx, m) {
+			switch strings.ToLower(imageType) {
+			case "backdrop", "art":
+				return "", nil
+			}
+		}
+		return pick(e.mediaPrimaryArtwork(ctx, m), e.mediaBackdropArtwork(ctx, m)), nil
+	}
+	if err != nil {
+		return "", err
+	}
+	if series, ok, err := e.findSeriesGroup(ctx, id, ""); err != nil {
+		return "", err
+	} else if ok {
+		return pick(series.PosterURL, series.BackdropURL), nil
+	}
+	return "", nil
+}
+
+func (e *EmbyService) mediaPrimaryArtwork(ctx context.Context, m *model.Media) string {
+	if m == nil {
+		return ""
+	}
+	if e.mediaShouldBeEpisode(ctx, m) && strings.TrimSpace(m.BackdropURL) != "" {
+		return m.BackdropURL
+	}
+	return m.PosterURL
+}
+
+func (e *EmbyService) mediaBackdropArtwork(ctx context.Context, m *model.Media) string {
+	if m == nil {
+		return ""
+	}
+	if e.mediaShouldBeEpisode(ctx, m) {
+		return ""
+	}
+	return m.BackdropURL
+}