From 43585b23332d08805b63f50ab53969f434cfa23c Mon Sep 17 00:00:00 2001
From: Eduard Urbach <e.urbach@gmail.com>
Date: Fri, 10 Nov 2017 11:46:05 +0100
Subject: [PATCH] Added age penalty to explore

---
 pages/explore/explore.go | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/pages/explore/explore.go b/pages/explore/explore.go
index 7dbabc46..ba3069e0 100644
--- a/pages/explore/explore.go
+++ b/pages/explore/explore.go
@@ -2,6 +2,7 @@ package explore
 
 import (
 	"sort"
+	"time"
 
 	"github.com/aerogo/aero"
 	"github.com/animenotifier/arn"
@@ -15,6 +16,8 @@ const (
 	watchingPopularityWeight  = 0.3
 	completedPopularityWeight = 0.3
 	plannedPopularityWeight   = 0.2
+	agePenalty                = 11.0
+	ageThreshold              = 6 * 30 * 24 * time.Hour
 )
 
 // Get ...
@@ -61,11 +64,11 @@ func filterAnime(year, status, typ string) []*arn.Anime {
 		results = append(results, anime)
 	}
 
-	sortAnime(results)
+	sortAnime(results, status)
 	return results
 }
 
-func sortAnime(animeList []*arn.Anime) {
+func sortAnime(animeList []*arn.Anime, filterStatus string) {
 	sort.Slice(animeList, func(i, j int) bool {
 		a := animeList[i]
 		b := animeList[j]
@@ -89,6 +92,17 @@ func sortAnime(animeList []*arn.Anime) {
 			scoreB -= popularityPenalty
 		}
 
+		// If we show current shows, rank old shows a bit lower
+		if filterStatus == "current" {
+			if a.StartDate != "" && time.Since(a.StartDateTime()) > ageThreshold {
+				scoreA -= agePenalty
+			}
+
+			if b.StartDate != "" && time.Since(b.StartDateTime()) > ageThreshold {
+				scoreB -= agePenalty
+			}
+		}
+
 		scoreA += float64(a.Popularity.Watching) * watchingPopularityWeight
 		scoreB += float64(b.Popularity.Watching) * watchingPopularityWeight