refactor: introduce typed resource kind

internal/deezer/kind.go

@@ -0,0 +1,57 @@
+package deezer
+
+import "fmt"
+
+type Kind string
+
+const (
+	KindAlbum    Kind = "album"
+	KindPlaylist Kind = "playlist"
+	KindArtist   Kind = "artist"
+	KindTrack    Kind = "track"
+)
+
+func (k Kind) pageMethod() string {
+	switch k {
+	case KindAlbum:
+		return "Album"
+	case KindPlaylist:
+		return "Playlist"
+	case KindArtist:
+		return "Artist"
+	case KindTrack:
+		return "Track"
+	}
+
+	return ""
+}
+
+func (k Kind) idKey() string {
+	switch k {
+	case KindAlbum:
+		return "alb_id"
+	case KindPlaylist:
+		return "playlist_id"
+	case KindArtist:
+		return "art_id"
+	case KindTrack:
+		return "sng_id"
+	}
+
+	return ""
+}
+
+func (k Kind) newResource() (Resource, error) {
+	switch k {
+	case KindAlbum:
+		return &Album{}, nil
+	case KindPlaylist:
+		return &Playlist{}, nil
+	case KindArtist:
+		return &Artist{}, nil
+	case KindTrack:
+		return &Single{}, nil
+	}
+
+	return nil, fmt.Errorf("unsupported resource type: %s", k)
+}