feat: image variants engine

internal/infrastructure/useCases/variantSummary.go

@@ -0,0 +1,22 @@
+package useCases
+
+import "RenewCMS/internal/domain/image"
+
+type VariantSummary struct {
+	Variant        image.Variant
+	GeneratedFiles int
+	CacheSize      int64
+}
+
+func summarize(variant image.Variant, totals map[string]image.VariantFileTotals) VariantSummary {
+	own := totals[variant.Name]
+	return VariantSummary{Variant: variant, GeneratedFiles: own.Files, CacheSize: own.Bytes}
+}
+
+func summaryOf(variant image.Variant, files image.VariantFileRepository) (VariantSummary, error) {
+	totals, err := files.Totals()
+	if err != nil {
+		return VariantSummary{}, err
+	}
+	return summarize(variant, totals), nil
+}