refactor: decouple tag writers from deezer models

internal/downloader/client.go

@@ -16,7 +16,7 @@ import (
 	"github.com/mathismqn/godeez/internal/deezer"
 	"github.com/mathismqn/godeez/internal/fileutil"
 	"github.com/mathismqn/godeez/internal/store"
-	"github.com/mathismqn/godeez/internal/tags"
+	"github.com/mathismqn/godeez/internal/tag"
 )
 
 const chunkSize = 2048
@@ -234,7 +234,7 @@ func (c *Client) streamToFile(ctx context.Context, stream io.ReadCloser, outputP
 func (c *Client) finalizeDownload(resource deezer.Resource, track *deezer.Track, outputPath, mediaFormat, genre string, cover []byte, bpmKey bpmKey) []string {
 	var warnings []string
 
-	if err := tags.AddTags(resource, track, cover, outputPath, bpmKey.BPM, bpmKey.Key, genre); err != nil {
+	if err := tag.Write(outputPath, buildTagMetadata(resource, track, cover, bpmKey, genre)); err != nil {
 		warnings = append(warnings, fmt.Sprintf("failed to add tags: %v", err))
 	}
 

internal/downloader/tagmeta.go

@@ -0,0 +1,40 @@
+package downloader
+
+import (
+	"strings"
+
+	"github.com/mathismqn/godeez/internal/deezer"
+	"github.com/mathismqn/godeez/internal/tag"
+)
+
+func buildTagMetadata(resource deezer.Resource, track *deezer.Track, cover []byte, bpm bpmKey, genre string) tag.Metadata {
+	m := tag.Metadata{
+		Title:       track.GetTitle(),
+		Artists:     strings.Join(track.Contributors.MainArtists, ", "),
+		Composers:   strings.Join(track.Contributors.Composers, ", "),
+		Lyricists:   strings.Join(track.Contributors.Authors, ", "),
+		Genre:       genre,
+		BPM:         bpm.BPM,
+		Key:         bpm.Key,
+		TrackNumber: track.TrackNumber,
+		Duration:    track.Duration,
+		Gain:        track.Gain,
+		ISRC:        track.ISRC,
+		Cover:       cover,
+	}
+
+	if album, ok := resource.(*deezer.Album); ok {
+		data := album.Results.Data
+		m.Album = &tag.AlbumMetadata{
+			Artist:              data.Artist,
+			Title:               data.Title,
+			Label:               data.Label,
+			OriginalReleaseDate: data.OriginalReleaseDate,
+			ReleaseDate:         data.PhysicalReleaseDate,
+			ProducerLine:        data.ProducerLine,
+			Copyright:           data.Copyright,
+		}
+	}
+
+	return m
+}