package photos

import (
	"fmt"
	"strings"
)

// objectKey builds an opaque, album-free storage key for a physical object.
// The key never encodes album, photo or any other metadata entity; the mapping
// between a key and its photo binding lives only in the metadata layer. The
// role segment is cosmetic (for debugging) and is not authoritative.
func objectKey(objectID, role, ext string) string {
	if ext != "" && !strings.HasPrefix(ext, ".") {
		ext = "." + ext
	}
	return fmt.Sprintf("objects/%s/%s%s", objectID, role, ext)
}