Details pane: director and cast from Trakt

With a Trakt client ID, the details of a movie or series show the
director(s) or creators and up to 8 cast members with their roles below
the plot, in every view. The title is found on Trakt by its TMDb/TVDB
(else IMDb) id, then its people are read. Casts are cached and, like
posters, only loaded once the selection rests.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/ui/format.go

@@ -11,6 +11,7 @@ import (
 	"git.stinnesbeck.com/nils/arr-tui/internal/arr"
 	"git.stinnesbeck.com/nils/arr-tui/internal/radarr"
 	"git.stinnesbeck.com/nils/arr-tui/internal/sonarr"
+	"git.stinnesbeck.com/nils/arr-tui/internal/trakt"
 )
 
 // movieLabel is the one-line list entry for a movie.
@@ -29,6 +30,9 @@ func movieLabel(m radarr.Movie) string {
 // state) and the plot below it.
 type detailText struct {
 	head, plot string
+	// people names the title for its cast, loaded from Trakt when it is shown
+	// (zero: none).
+	people trakt.Ref
 }
 
 // String joins both parts, for places that show them as one text.
@@ -39,6 +43,49 @@ func (d detailText) String() string {
 	return d.head + "\n" + d.plot
 }
 
+func movieRef(m radarr.Movie) trakt.Ref {
+	return trakt.Ref{Kind: trakt.Movies, TMDB: m.TMDBID, IMDB: m.IMDBID}
+}
+
+func seriesRef(s sonarr.Series) trakt.Ref {
+	return trakt.Ref{Kind: trakt.Shows, TVDB: s.TVDBID, TMDB: s.TMDBID, IMDB: s.IMDBID}
+}
+
+// peopleText renders the cast and directors (creators) of a title for the
+// details pane, at most maxCast actors.
+func peopleText(p trakt.People, kind trakt.Kind) string {
+	const maxCast = 8
+	var b strings.Builder
+	if len(p.Leaders) > 0 {
+		label := "Director"
+		if kind == trakt.Shows {
+			label = "Created by"
+		} else if len(p.Leaders) > 1 {
+			label = "Directors"
+		}
+		names := make([]string, len(p.Leaders))
+		for i, l := range p.Leaders {
+			names[i] = tview.Escape(l.Name)
+		}
+		fmt.Fprintf(&b, "[::b]%s[::-] %s\n", label, strings.Join(names, ", "))
+	}
+	if len(p.Cast) > 0 {
+		b.WriteString("[::b]Cast[::-]\n")
+		for i, c := range p.Cast {
+			if i == maxCast {
+				fmt.Fprintf(&b, "[gray]and %d more[-]\n", len(p.Cast)-maxCast)
+				break
+			}
+			b.WriteString(tview.Escape(c.Name))
+			if c.Role != "" {
+				b.WriteString(" [gray]as " + tview.Escape(c.Role) + "[-]")
+			}
+			b.WriteByte('\n')
+		}
+	}
+	return strings.TrimRight(b.String(), "\n")
+}
+
 // movieDetails renders the detail pane text for a movie.
 func movieDetails(m radarr.Movie) detailText {
 	var b strings.Builder
@@ -73,7 +120,7 @@ func movieDetails(m radarr.Movie) detailText {
 	case m.InLibrary():
 		b.WriteString("[yellow]In library, not downloaded[-]\n")
 	}
-	return detailText{head: b.String(), plot: tview.Escape(m.Overview)}
+	return detailText{head: b.String(), plot: tview.Escape(m.Overview), people: movieRef(m)}
 }
 
 // profileIndex returns the index of the profile named name, or 0.
@@ -149,7 +196,7 @@ func seriesDetails(s sonarr.Series) detailText {
 			fmt.Fprintf(&b, "[yellow]In library, %d/%d episodes downloaded[-]\n", st.EpisodeFileCount, st.EpisodeCount)
 		}
 	}
-	return detailText{head: b.String(), plot: tview.Escape(s.Overview)}
+	return detailText{head: b.String(), plot: tview.Escape(s.Overview), people: seriesRef(s)}
 }
 
 func plural(n int) string {