feat: fetch actual episode count for airing anime

internal/anime/details_handler.go

@@ -18,8 +18,20 @@ const (
 	animeSectionTimeout = 12 * time.Second
 	watchOrderTimeout   = 15 * time.Second
 	audioLookupTimeout  = 8 * time.Second
+	episodeCountTimeout = 4 * time.Second
 )
 
+func listedEpisodeCount(episodes []domain.EpisodeData) int {
+	count := 0
+	for _, episode := range episodes {
+		if episode.MalID <= 0 || episode.IsRecap {
+			continue
+		}
+		count++
+	}
+	return count
+}
+
 func releasedEpisodeCount(anime domain.Anime, now time.Time) int {
 	if !anime.Airing || anime.Aired.From == "" {
 		return 0
@@ -37,6 +49,32 @@ func releasedEpisodeCount(anime domain.Anime, now time.Time) int {
 	return count
 }
 
+func (h *AnimeHandler) animeEpisodeCount(ctx context.Context, anime domain.Anime, now time.Time) int {
+	if h.svc != nil && anime.Airing {
+		episodeCtx, cancel := context.WithTimeout(ctx, episodeCountTimeout)
+		defer cancel()
+
+		episodes, err := h.svc.GetAllEpisodes(episodeCtx, anime.MalID)
+		if err == nil {
+			if count := listedEpisodeCount(episodes); count > 0 {
+				return count
+			}
+		} else {
+			observability.Warn(
+				"anime_episode_count_fetch_failed",
+				"anime",
+				"",
+				map[string]any{
+					"anime_id": anime.MalID,
+				},
+				err,
+			)
+		}
+	}
+
+	return releasedEpisodeCount(anime, now)
+}
+
 func animeAudioAvailabilityLabel(episodes []domain.CanonicalEpisode) string {
 	hasKnownSub := false
 	for _, episode := range episodes {
@@ -122,7 +160,7 @@ func (h *AnimeHandler) HandleAnimeDetails(c *gin.Context) {
 	}
 
 	audioAvailability := h.animeAudioAvailability(c.Request.Context(), anime)
-	episodesCount := releasedEpisodeCount(anime, time.Now())
+	episodesCount := h.animeEpisodeCount(c.Request.Context(), anime, time.Now())
 
 	c.HTML(http.StatusOK, "anime.gohtml", gin.H{
 		"Anime":                anime,

internal/anime/handler_test.go

@@ -113,6 +113,20 @@ func TestReleasedEpisodeCount(t *testing.T) {
 	}
 }
 
+func TestListedEpisodeCount(t *testing.T) {
+	episodes := []domain.EpisodeData{
+		{MalID: 1, Title: "Episode 1"},
+		{MalID: 2, Title: "Episode 2"},
+		{MalID: 3, Title: "Recap", IsRecap: true},
+		{Title: "missing id"},
+	}
+
+	got := listedEpisodeCount(episodes)
+	if got != 2 {
+		t.Fatalf("listedEpisodeCount() = %d, want 2", got)
+	}
+}
+
 func TestAnimeAudioAvailabilityLabel(t *testing.T) {
 	tests := []struct {
 		name     string