Remove current artwork implementation

model/artwork_id.go

@@ -0,0 +1,61 @@
+package model
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type Kind struct{ prefix string }
+
+var (
+	KindMediaFileArtwork = Kind{"mf"}
+	KindAlbumArtwork     = Kind{"al"}
+)
+
+type ArtworkID struct {
+	Kind       Kind
+	ID         string
+	LastAccess time.Time
+}
+
+func (id ArtworkID) String() string {
+	return fmt.Sprintf("%s-%s-%x", id.Kind.prefix, id.ID, id.LastAccess.Unix())
+}
+
+func ParseArtworkID(id string) (ArtworkID, error) {
+	parts := strings.Split(id, "-")
+	if len(parts) != 3 {
+		return ArtworkID{}, errors.New("invalid artwork id")
+	}
+	lastUpdate, err := strconv.ParseInt(parts[2], 16, 64)
+	if err != nil {
+		return ArtworkID{}, err
+	}
+	if parts[0] != KindAlbumArtwork.prefix && parts[0] != KindMediaFileArtwork.prefix {
+		return ArtworkID{}, errors.New("invalid artwork kind")
+	}
+	return ArtworkID{
+		Kind:       Kind{parts[0]},
+		ID:         parts[1],
+		LastAccess: time.Unix(lastUpdate, 0),
+	}, nil
+}
+
+func artworkIDFromAlbum(al Album) ArtworkID {
+	return ArtworkID{
+		Kind:       KindAlbumArtwork,
+		ID:         al.ID,
+		LastAccess: al.UpdatedAt,
+	}
+}
+
+func artworkIDFromMediaFile(mf MediaFile) ArtworkID {
+	return ArtworkID{
+		Kind:       KindMediaFileArtwork,
+		ID:         mf.ID,
+		LastAccess: mf.UpdatedAt,
+	}
+}