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// Package scanner implements media library scanning logic.
package scanner
import (
"fmt"
"io/fs"
"path/filepath"
"strings"
"codeberg.org/snonux/player/internal/mediatype"
)
// fileDiscoverer walks a set directory and collects media file paths and
// cover image locations. It is responsible solely for filesystem traversal —
// it does not probe, store, or generate thumbnails.
type fileDiscoverer struct {
fs FS
}
// newFileDiscoverer creates a fileDiscoverer backed by the given filesystem abstraction.
func newFileDiscoverer(fs FS) *fileDiscoverer {
return &fileDiscoverer{fs: fs}
}
// Discover walks setPath and returns the absolute paths of all supported media
// files, skipping hidden directories (names starting with ".").
func (d *fileDiscoverer) Discover(setPath string) ([]string, error) {
var files []string
walkErr := d.fs.WalkDir(setPath, func(path string, entry fs.DirEntry, err error) error {
if err != nil {
return fmt.Errorf("walk %q: %w", path, err)
}
// Skip hidden directories (e.g. .git, .thumbnails) to avoid
// accidentally ingesting dot-prefixed paths.
if entry.IsDir() {
if strings.HasPrefix(entry.Name(), ".") && path != setPath {
return filepath.SkipDir
}
return nil
}
if !mediatype.IsSupportedExt(path) {
return nil
}
files = append(files, path)
return nil
})
if walkErr != nil {
return nil, walkErr
}
return files, nil
}
// gatherCoverImages walks the set directory and records the first cover image
// per directory. The returned map is keyed by absolute directory path; values
// are the image path relative to setPath so callers can join them as needed.
func (d *fileDiscoverer) gatherCoverImages(setPath string) map[string]string {
coverImages := make(map[string]string)
_ = d.fs.WalkDir(setPath, func(path string, entry fs.DirEntry, err error) error {
if err != nil || entry.IsDir() || !mediatype.IsCoverImageExt(path) {
// Skip hidden subdirectories, but tolerate walk errors silently
// since missing cover images are non-fatal.
if entry != nil && entry.IsDir() && strings.HasPrefix(entry.Name(), ".") && path != setPath {
return filepath.SkipDir
}
return nil
}
relPath, _ := filepath.Rel(setPath, path)
dir := filepath.Dir(path)
if _, ok := coverImages[dir]; !ok {
coverImages[dir] = relPath
}
return nil
})
return coverImages
}
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