append metadata when downloading episodes

metadata.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"strconv"
+
+	"go.senan.xyz/taglib"
+)
+
+func getPodcastCover(imageUrl string) ([]byte, error) {
+	resp, err := http.Get(imageUrl)
+	if err != nil {
+		return nil, fmt.Errorf("failed to fetch podcast cover image: %v", err)
+	}
+	defer resp.Body.Close()
+
+	data, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read image data from response: %v", err)
+	}
+
+	return data, nil
+}
+
+func appendPodcastMetadata(filePath string, feedItem RSSFeedItem, episodeNumber int, podcast Podcast) error {
+	if err := taglib.WriteTags(filePath, map[string][]string{
+		taglib.Artist:      {podcast.Name},
+		taglib.AlbumArtist: {podcast.Name},
+		taglib.Album:       {podcast.Name},
+		taglib.TrackNumber: {strconv.Itoa(episodeNumber)},
+		taglib.Podcast:     {podcast.Name},
+		taglib.PodcastURL:  {podcast.Link},
+		taglib.PodcastDesc: {podcast.Description},
+		taglib.Title:       {feedItem.Title},
+	}, 0); err != nil {
+		return fmt.Errorf("failed to append tags: %v", err)
+	}
+
+	imgData, err := getPodcastCover(podcast.Image)
+	if err != nil {
+		return fmt.Errorf("failed to fetch podcast cover: %v", err)
+	}
+
+	if err := taglib.WriteImage(filePath, imgData); err != nil {
+		return fmt.Errorf("failed to append cover image: %v", err)
+	}
+
+	return nil
+}