// Package coverart finds and fetches album cover artwork.
//
// Two-layer model: a directory-walking sidecar lookup (cover.jpg / folder.jpg
// next to the audio files) and a MusicBrainz Cover Art Archive (MBCAA)
// fallback for albums with an MBID but no sidecar. The Enricher orchestrates
// the two; the API and Subsonic packages reuse the sidecar helper directly.
package coverart

import (
	"os"
	"path/filepath"
)

// SidecarNames is the lookup order for cover art living next to audio files.
// Matches common library conventions: cover.* wins over folder.*; JPEG wins
// over PNG when both are present.
var SidecarNames = []string{
	"cover.jpg", "cover.jpeg", "cover.png",
	"folder.jpg", "folder.jpeg", "folder.png",
}

// FindSidecar returns the absolute path to a sidecar cover image in
// albumDir, or "" when none of the conventional names are present as a
// regular file. Directories named like sidecar files are skipped.
func FindSidecar(albumDir string) string {
	for _, name := range SidecarNames {
		candidate := filepath.Join(albumDir, name)
		info, err := os.Stat(candidate)
		if err != nil || info.IsDir() {
			continue
		}
		return candidate
	}
	return ""
}