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package thumb
import (
"errors"
"fmt"
"os"
"path/filepath"
"codeberg.org/snonux/player/internal/model"
)
// ErrNotFound is returned by a Resolver when a media item has no thumbnail
// (and no acceptable fallback) available. Callers translate this sentinel
// to their domain-specific not-found error (e.g. service.ErrNotFound).
var ErrNotFound = errors.New("thumbnail not found")
// ResolvedFile describes a thumbnail file that has been located on (or
// abstractly resolved from) some backing store. It contains everything a
// caller needs to construct a HTTP file response without itself touching
// the filesystem.
type ResolvedFile struct {
Path string
FileName string
FileSize int64
}
// Resolver abstracts the "given a media item, return a thumbnail file" step.
// Pulling this out of browseService lets the service layer avoid direct
// os.Stat calls and lets tests inject a fake resolver instead of writing
// temporary files.
type Resolver interface {
// Resolve returns a ResolvedFile for the media's thumbnail. If the
// media has no thumbnail and no fallback is available, it returns
// ErrNotFound. Any other error indicates a real I/O problem.
Resolve(media *model.Media) (*ResolvedFile, error)
}
// FSResolver is the production Resolver that stats files on the local
// filesystem. It encapsulates the original logic that lived in
// browseService.GetThumbnail: prefer the generated thumbnail, fall back to
// the original file for images so that cover.jpg-style assets still render.
type FSResolver struct{}
// NewFSResolver returns a Resolver backed by os.Stat against real paths.
func NewFSResolver() *FSResolver {
return &FSResolver{}
}
// Resolve looks up the thumbnail file on disk for media, falling back to
// the original AbsPath for image media when the generated thumbnail is
// missing. A missing or empty thumbnail path with no fallback yields
// ErrNotFound so callers can map it to a 404 cleanly.
func (FSResolver) Resolve(media *model.Media) (*ResolvedFile, error) {
if media == nil {
return nil, ErrNotFound
}
if media.ThumbnailPath == "" {
return nil, ErrNotFound
}
if info, err := os.Stat(media.ThumbnailPath); err == nil {
return &ResolvedFile{
Path: media.ThumbnailPath,
FileName: filepath.Base(media.ThumbnailPath),
FileSize: info.Size(),
}, nil
} else if media.Type == model.MediaTypeImage {
// Generated thumbnail missing: for images, fall back to the
// original file so cover.jpg / folder.jpg etc. still render.
if info, statErr := os.Stat(media.AbsPath); statErr == nil {
return &ResolvedFile{
Path: media.AbsPath,
FileName: filepath.Base(media.AbsPath),
FileSize: info.Size(),
}, nil
}
return nil, fmt.Errorf("stat thumbnail: %w", err)
} else {
return nil, fmt.Errorf("stat thumbnail: %w", err)
}
}
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