package gallery

import (
	"path/filepath"
	"strings"
)

func isVideo(name string) bool {
	switch strings.ToLower(filepath.Ext(name)) {
	case ".mp4", ".webm", ".mov":
		return true
	default:
		return false
	}
}

func isGalleryMedia(name string) bool {
	return isJPEG(name) || isVideo(name)
}

// thumbLookupRel is the path under thumbs/ (and hero/) used to find derivatives.
// Videos use a JPEG poster: clip.mp4 → clip.jpg.
func thumbLookupRel(rel string) string {
	if isVideo(filepath.Base(rel)) {
		return videoPosterRel(rel)
	}
	return rel
}

func videoPosterRel(rel string) string {
	ext := filepath.Ext(rel)
	if ext == "" {
		return rel + ".jpg"
	}
	return strings.TrimSuffix(rel, ext) + ".jpg"
}