Show sequels of completed anime

pages/explore/explore.pixy

@@ -1,4 +1,4 @@
-component ExploreAnime(animeList []*arn.Anime, year string, status string, typ string, user *arn.User)
+component ExploreAnime(animes []*arn.Anime, year string, status string, typ string, user *arn.User)
 	#filter-root(data-url="/explore/anime")
 	ExploreFilters(year, status, typ, false)
 
@@ -7,6 +7,10 @@ component ExploreAnime(animeList []*arn.Anime, year string, status string, typ s
 			button.action(data-trigger="click", data-action="hideAddedAnime", title="Hide anime in my collection")
 				RawIcon("eye-slash")
 		
+		if user != nil
+			a.button(href="/explore/sequels", title="View sequels of my completed anime")
+				RawIcon("forward")
+		
 		a.button(href="/explore/color/any/anime", title="View colors")
 			RawIcon("paint-brush")
 		
@@ -16,10 +20,10 @@ component ExploreAnime(animeList []*arn.Anime, year string, status string, typ s
 	h1.page-title Explore
 
 	.explore-anime
-		if len(animeList) == 0
+		if len(animes) == 0
 			p.no-data.mountable No anime found using the above filters.
 		else
-			AnimeGrid(animeList, user)
+			AnimeGrid(animes, user)
 
 component ExploreFilters(year string, status string, typ string, advancedFilters bool)
 	.explore-filters

pages/explore/explorerelations/relations.pixy

@@ -0,0 +1,8 @@
+component ExploreAnimeSequels(entries []*utils.AnimeWithRelatedAnime, user *arn.User)
+	h1 Sequels of my completed anime
+
+	.explore-anime
+		if len(entries) == 0
+			p.no-data.mountable No sequels found for the anime you completed.
+		else
+			AnimeGridWithRelation(entries, user)

pages/explore/explorerelations/sequels.go

@@ -0,0 +1,57 @@
+package explorerelations
+
+import (
+	"net/http"
+	"sort"
+
+	"github.com/animenotifier/arn"
+
+	"github.com/aerogo/aero"
+	"github.com/animenotifier/notify.moe/components"
+	"github.com/animenotifier/notify.moe/utils"
+)
+
+// Sequels ...
+func Sequels(ctx *aero.Context) string {
+	user := utils.GetUser(ctx)
+
+	if user == nil {
+		return ctx.Error(http.StatusUnauthorized, "Not logged in", nil)
+	}
+
+	animeList := user.AnimeList()
+	sequels := []*utils.AnimeWithRelatedAnime{}
+
+	for anime := range arn.StreamAnime() {
+		if animeList.Contains(anime.ID) {
+			continue
+		}
+
+		prequels := anime.Prequels()
+
+		for _, prequel := range prequels {
+			item := animeList.Find(prequel.ID)
+
+			if item != nil && item.Status == arn.AnimeListStatusCompleted {
+				sequels = append(sequels, &utils.AnimeWithRelatedAnime{
+					Anime:   anime,
+					Related: prequel,
+				})
+				break
+			}
+		}
+	}
+
+	sort.Slice(sequels, func(i, j int) bool {
+		aScore := sequels[i].Anime.Score()
+		bScore := sequels[j].Anime.Score()
+
+		if aScore == bScore {
+			return sequels[i].Anime.Title.Canonical < sequels[j].Anime.Title.Canonical
+		}
+
+		return aScore > bScore
+	})
+
+	return ctx.HTML(components.ExploreAnimeSequels(sequels, user))
+}

pages/index.go

@@ -28,6 +28,7 @@ import (
 	"github.com/animenotifier/notify.moe/pages/episode"
 	"github.com/animenotifier/notify.moe/pages/explore"
 	"github.com/animenotifier/notify.moe/pages/explore/explorecolor"
+	"github.com/animenotifier/notify.moe/pages/explore/explorerelations"
 	"github.com/animenotifier/notify.moe/pages/forum"
 	"github.com/animenotifier/notify.moe/pages/genre"
 	"github.com/animenotifier/notify.moe/pages/genres"
@@ -79,6 +80,7 @@ func Configure(app *aero.Application) {
 	l.Page("/explore/anime/:year/:status/:type", explore.Filter)
 	l.Page("/explore/color/:color/anime", explorecolor.AnimeByAverageColor)
 	l.Page("/explore/color/:color/anime/from/:index", explorecolor.AnimeByAverageColor)
+	l.Page("/explore/sequels", explorerelations.Sequels)
 	l.Page("/login", login.Get)
 	l.Page("/api", apiview.Get)
 	// l.Ajax("/dashboard", dashboard.Get)